src/diffviewer/ydiff.c

   1 /*
   2    Copyright (C) 2007, 2010  Free Software Foundation, Inc.
   3    Written by:
   4    2007 Daniel Borca <dborca@yahoo.com>
   5
   6    2010 Slava Zanko <slavazanko@gmail.com>
   7    2010 Andrew Borodin <aborodin@vmail.ru>
   8    2010 Ilia Maslakov <il.smind@gmail.com>
   9
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 2 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program; if not, write to the Free Software
  23    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  24  */
  25
  26
  27 #include <config.h>
  28 #include <ctype.h>
  29 #include <errno.h>
  30 #include <fcntl.h>
  31 #include <stdlib.h>
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34 #include <sys/wait.h>
  35
  36 #include "lib/global.h"
  37 #include "lib/tty/tty.h"
  38 #include "lib/tty/color.h"
  39 #include "lib/tty/key.h"
  40
  41 #include "lib/skin.h"           /* EDITOR_NORMAL_COLOR */
  42 #include "lib/vfs/mc-vfs/vfs.h" /* mc_opendir, mc_readdir, mc_closedir, */
  43
  44 #include "src/cmddef.h"
  45 #include "src/keybind.h"
  46 #include "src/cmd.h"
  47 #include "src/dialog.h"
  48 #include "src/help.h"
  49 #include "src/wtools.h"
  50 #include "src/charsets.h"
  51 #include "src/history.h"
  52 #include "src/panel.h"          /* Needed for current_panel and other_panel */
  53 #include "src/layout.h"         /* Needed for get_current_index and get_other_panel */
  54 #include "src/main.h"           /* mc_run_mode */
  55 #include "src/selcodepage.h"
  56
  57 #include "ydiff.h"
  58 #include "internal.h"
  59
  60 /*** global variables ****************************************************************************/
  61
  62 /*** file scope macro definitions ****************************************************************/
  63
  64 #define g_array_foreach(a, TP, cbf) \
  65 do { \
  66     size_t g_array_foreach_i;\
  67     TP *g_array_foreach_var=NULL; \
  68     for (g_array_foreach_i=0;g_array_foreach_i < a->len; g_array_foreach_i++) \
  69     { \
  70         g_array_foreach_var = &g_array_index(a,TP,g_array_foreach_i); \
  71         (*cbf) (g_array_foreach_var); \
  72     } \
  73 } while (0)
  74
  75 #define FILE_READ_BUF   4096
  76 #define FILE_FLAG_TEMP  (1 << 0)
  77
  78 #define OPTX 56
  79 #define OPTY 17
  80
  81 #define ADD_CH          '+'
  82 #define DEL_CH          '-'
  83 #define CHG_CH          '*'
  84 #define EQU_CH          ' '
  85
  86 #define HDIFF_ENABLE    1
  87 #define HDIFF_MINCTX    5
  88 #define HDIFF_DEPTH     10
  89
  90 #define FILE_DIRTY(fs)  \
  91     do {                \
  92         (fs)->pos = 0;  \
  93         (fs)->len = 0;  \
  94     } while (0)
  95
  96
  97 /*** file scope type declarations ****************************************************************/
  98
  99 /*** file scope variables ************************************************************************/
 100
 101 /*** file scope functions ************************************************************************/
 102 /* --------------------------------------------------------------------------------------------- */
 103
 104 static inline int
 105 TAB_SKIP (int ts, int pos)
 106 {
 107     if (ts > 0 && ts < 9)
 108         return ts - pos % ts;
 109     else
 110         return 8 - pos % 8;
 111 }
 112
 113 /* --------------------------------------------------------------------------------------------- */
 114
 115 static void
 116 dview_set_codeset (WDiff * dview)
 117 {
 118 #ifdef HAVE_CHARSET
 119     const char *encoding_id = NULL;
 120
 121     dview->utf8 = TRUE;
 122     encoding_id = get_codepage_id (source_codepage >= 0 ? source_codepage : display_codepage);
 123     if (encoding_id != NULL)
 124     {
 125         GIConv conv;
 126         conv = str_crt_conv_from (encoding_id);
 127         if (conv != INVALID_CONV)
 128         {
 129             if (dview->converter != str_cnv_from_term)
 130                 str_close_conv (dview->converter);
 131             dview->converter = conv;
 132         }
 133         dview->utf8 = (gboolean) str_isutf8 (encoding_id);
 134     }
 135 #else
 136     (void) dview;
 137 #endif
 138 }
 139
 140 /* --------------------------------------------------------------------------------------------- */
 141
 142 static void
 143 dview_select_encoding (WDiff * dview)
 144 {
 145 #ifdef HAVE_CHARSET
 146     if (do_select_codepage ())
 147         dview_set_codeset (dview);
 148 #else
 149     (void) dview;
 150 #endif
 151 }
 152
 153
 154 static gboolean
 155 rewrite_backup_content (const char *from_file_name, const char *to_file_name)
 156 {
 157     FILE *backup_fd;
 158     char *contents;
 159     gsize length;
 160
 161     if (!g_file_get_contents (from_file_name, &contents, &length, NULL))
 162         return FALSE;
 163
 164     backup_fd = fopen (to_file_name, "w");
 165     if (backup_fd == NULL)
 166     {
 167         g_free (contents);
 168         return FALSE;
 169     }
 170
 171     fwrite ((const void *) contents, length, 1, backup_fd);
 172
 173     fflush (backup_fd);
 174     fclose (backup_fd);
 175     g_free (contents);
 176     return TRUE;
 177 }
 178
 179 /* buffered I/O ************************************************************* */
 180
 181 /**
 182  * Try to open a temporary file.
 183  *
 184  * \param[out] name address of a pointer to store the temporary name
 185  *
 186  * \return file descriptor on success, negative on error
 187  *
 188  * \note the name is not altered if this function fails
 189  */
 190
 191 static int
 192 open_temp (void **name)
 193 {
 194     int fd;
 195     char *diff_file_name = NULL;
 196
 197     fd = mc_mkstemps (&diff_file_name, "mcdiff", NULL);
 198     if (fd == -1)
 199     {
 200         message (D_ERROR, MSG_ERROR,
 201                  _("Cannot create temporary diff file\n%s"), unix_error_string (errno));
 202         return -1;
 203     }
 204     *name = diff_file_name;
 205     return fd;
 206 }
 207
 208 /* --------------------------------------------------------------------------------------------- */
 209
 210 /**
 211  * Alocate file structure and associate file descriptor to it.
 212  *
 213  * \param fd file descriptor
 214  *
 215  * \return file structure
 216  */
 217 static FBUF *
 218 f_dopen (int fd)
 219 {
 220     FBUF *fs;
 221
 222     if (fd < 0)
 223         return NULL;
 224
 225     fs = g_try_malloc (sizeof (FBUF));
 226     if (fs == NULL)
 227         return NULL;
 228
 229     fs->buf = g_try_malloc (FILE_READ_BUF);
 230     if (fs->buf == NULL)
 231     {
 232         g_free (fs);
 233         return NULL;
 234     }
 235
 236     fs->fd = fd;
 237     FILE_DIRTY (fs);
 238     fs->flags = 0;
 239     fs->data = NULL;
 240
 241     return fs;
 242 }
 243
 244 /* --------------------------------------------------------------------------------------------- */
 245
 246 /**
 247  * Free file structure without closing the file.
 248  *
 249  * \param fs file structure
 250  *
 251  * \return 0 on success, non-zero on error
 252  */
 253 static int
 254 f_free (FBUF * fs)
 255 {
 256     int rv = 0;
 257     if (fs->flags & FILE_FLAG_TEMP)
 258     {
 259         rv = unlink (fs->data);
 260         g_free (fs->data);
 261     }
 262     g_free (fs->buf);
 263     g_free (fs);
 264     return rv;
 265 }
 266
 267
 268 /* --------------------------------------------------------------------------------------------- */
 269
 270 /**
 271  * Open a binary temporary file in R/W mode.
 272  *
 273  * \return file structure
 274  *
 275  * \note the file will be deleted when closed
 276  */
 277 static FBUF *
 278 f_temp (void)
 279 {
 280     int fd;
 281     FBUF *fs;
 282
 283     fs = f_dopen (0);
 284     if (fs == NULL)
 285     {
 286         return NULL;
 287     }
 288
 289     fd = open_temp (&fs->data);
 290     if (fd < 0)
 291     {
 292         f_free (fs);
 293         return NULL;
 294     }
 295
 296     fs->fd = fd;
 297     fs->flags = FILE_FLAG_TEMP;
 298     return fs;
 299 }
 300
 301 /* --------------------------------------------------------------------------------------------- */
 302
 303 /**
 304  * Open a binary file in specified mode.
 305  *
 306  * \param filename file name
 307  * \param flags open mode, a combination of O_RDONLY, O_WRONLY, O_RDWR
 308  *
 309  * \return file structure
 310  */
 311 static FBUF *
 312 f_open (const char *filename, int flags)
 313 {
 314     int fd;
 315     FBUF *fs;
 316
 317     fs = f_dopen (0);
 318     if (fs == NULL)
 319     {
 320         return NULL;
 321     }
 322
 323     fd = open (filename, flags);
 324     if (fd < 0)
 325     {
 326         f_free (fs);
 327         return NULL;
 328     }
 329
 330     fs->fd = fd;
 331     return fs;
 332 }
 333
 334 /* --------------------------------------------------------------------------------------------- */
 335
 336 /**
 337  * Read a line of bytes from file until newline or EOF.
 338  *
 339  * \param buf destination buffer
 340  * \param size size of buffer
 341  * \param fs file structure
 342  *
 343  * \return number of bytes read
 344  *
 345  * \note does not stop on null-byte
 346  * \note buf will not be null-terminated
 347  */
 348 static size_t
 349 f_gets (char *buf, size_t size, FBUF * fs)
 350 {
 351     size_t j = 0;
 352
 353     do
 354     {
 355         int i;
 356         int stop = 0;
 357
 358         for (i = fs->pos; j < size && i < fs->len && !stop; i++, j++)
 359         {
 360             buf[j] = fs->buf[i];
 361             if (buf[j] == '\n')
 362             {
 363                 stop = 1;
 364             }
 365         }
 366         fs->pos = i;
 367
 368         if (j == size || stop)
 369         {
 370             break;
 371         }
 372
 373         fs->pos = 0;
 374         fs->len = read (fs->fd, fs->buf, FILE_READ_BUF);
 375     }
 376     while (fs->len > 0);
 377
 378     return j;
 379 }
 380
 381 /* --------------------------------------------------------------------------------------------- */
 382
 383 /**
 384  * Seek into file.
 385  *
 386  * \param fs file structure
 387  * \param off offset
 388  * \param whence seek directive: SEEK_SET, SEEK_CUR or SEEK_END
 389  *
 390  * \return position in file, starting from begginning
 391  *
 392  * \note avoids thrashing read cache when possible
 393  */
 394 static off_t
 395 f_seek (FBUF * fs, off_t off, int whence)
 396 {
 397     off_t rv;
 398
 399     if (fs->len && whence != SEEK_END)
 400     {
 401         rv = lseek (fs->fd, 0, SEEK_CUR);
 402         if (rv != -1)
 403         {
 404             if (whence == SEEK_CUR)
 405             {
 406                 whence = SEEK_SET;
 407                 off += rv - fs->len + fs->pos;
 408             }
 409             if (off - rv >= -fs->len && off - rv <= 0)
 410             {
 411                 fs->pos = fs->len + off - rv;
 412                 return off;
 413             }
 414         }
 415     }
 416
 417     rv = lseek (fs->fd, off, whence);
 418     if (rv != -1)
 419     {
 420         FILE_DIRTY (fs);
 421     }
 422     return rv;
 423 }
 424
 425 /* --------------------------------------------------------------------------------------------- */
 426
 427 /**
 428  * Seek to the beginning of file, thrashing read cache.
 429  *
 430  * \param fs file structure
 431  *
 432  * \return 0 if success, non-zero on error
 433  */
 434 static off_t
 435 f_reset (FBUF * fs)
 436 {
 437     off_t rv = lseek (fs->fd, 0, SEEK_SET);
 438     if (rv != -1)
 439     {
 440         FILE_DIRTY (fs);
 441     }
 442     return rv;
 443 }
 444
 445 /* --------------------------------------------------------------------------------------------- */
 446
 447 /**
 448  * Write bytes to file.
 449  *
 450  * \param fs file structure
 451  * \param buf source buffer
 452  * \param size size of buffer
 453  *
 454  * \return number of written bytes, -1 on error
 455  *
 456  * \note thrashes read cache
 457  */
 458 static ssize_t
 459 f_write (FBUF * fs, const char *buf, size_t size)
 460 {
 461     ssize_t rv = write (fs->fd, buf, size);
 462     if (rv >= 0)
 463     {
 464         FILE_DIRTY (fs);
 465     }
 466     return rv;
 467 }
 468
 469 /* --------------------------------------------------------------------------------------------- */
 470
 471 /**
 472  * Truncate file to the current position.
 473  *
 474  * \param fs file structure
 475  *
 476  * \return current file size on success, negative on error
 477  *
 478  * \note thrashes read cache
 479  */
 480 static off_t
 481 f_trunc (FBUF * fs)
 482 {
 483     off_t off = lseek (fs->fd, 0, SEEK_CUR);
 484     if (off != -1)
 485     {
 486         int rv = ftruncate (fs->fd, off);
 487         if (rv != 0)
 488         {
 489             off = -1;
 490         }
 491         else
 492         {
 493             FILE_DIRTY (fs);
 494         }
 495     }
 496     return off;
 497 }
 498
 499 /* --------------------------------------------------------------------------------------------- */
 500
 501 /**
 502  * Close file.
 503  *
 504  * \param fs file structure
 505  *
 506  * \return 0 on success, non-zero on error
 507  *
 508  * \note if this is temporary file, it is deleted
 509  */
 510 static int
 511 f_close (FBUF * fs)
 512 {
 513     int rv = close (fs->fd);
 514     f_free (fs);
 515     return rv;
 516 }
 517
 518 /* --------------------------------------------------------------------------------------------- */
 519
 520 /**
 521  * Create pipe stream to process.
 522  *
 523  * \param cmd shell command line
 524  * \param flags open mode, either O_RDONLY or O_WRONLY
 525  *
 526  * \return file structure
 527  */
 528 static FBUF *
 529 p_open (const char *cmd, int flags)
 530 {
 531     FILE *f;
 532     FBUF *fs;
 533     const char *type = NULL;
 534
 535     if (flags == O_RDONLY)
 536     {
 537         type = "r";
 538     }
 539     if (flags == O_WRONLY)
 540     {
 541         type = "w";
 542     }
 543
 544     if (type == NULL)
 545     {
 546         return NULL;
 547     }
 548
 549     fs = f_dopen (0);
 550     if (fs == NULL)
 551     {
 552         return NULL;
 553     }
 554
 555     f = popen (cmd, type);
 556     if (f == NULL)
 557     {
 558         f_free (fs);
 559         return NULL;
 560     }
 561
 562     fs->fd = fileno (f);
 563     fs->data = f;
 564     return fs;
 565 }
 566
 567 /* --------------------------------------------------------------------------------------------- */
 568
 569 /**
 570  * Close pipe stream.
 571  *
 572  * \param fs structure
 573  *
 574  * \return 0 on success, non-zero on error
 575  */
 576 static int
 577 p_close (FBUF * fs)
 578 {
 579     int rv = pclose (fs->data);
 580     f_free (fs);
 581     return rv;
 582 }
 583
 584 /**
 585  * Get one char (byte) from string
 586  *
 587  * \param char * str, gboolean * result
 588  *
 589  * \return int as character or 0 and result == FALSE if fail
 590  */
 591
 592 static int
 593 dview_get_byte (char *str, gboolean * result)
 594 {
 595     if (str == NULL)
 596     {
 597         *result = FALSE;
 598         return 0;
 599     }
 600     *result = TRUE;
 601     return (unsigned char) *str;
 602 }
 603
 604
 605 /**
 606  * Get utf multibyte char from string
 607  *
 608  * \param char * str, int * char_width, gboolean * result
 609  *
 610  * \return int as utf character or 0 and result == FALSE if fail
 611  */
 612
 613 static int
 614 dview_get_utf (char *str, int *char_width, gboolean * result)
 615 {
 616     int res = -1;
 617     gunichar ch;
 618     gchar *next_ch = NULL;
 619     int width = 0;
 620
 621     *result = TRUE;
 622
 623     if (str == NULL)
 624     {
 625         *result = FALSE;
 626         width = 0;
 627         return 0;
 628     }
 629
 630     res = g_utf8_get_char_validated (str, -1);
 631
 632     if (res < 0)
 633     {
 634         ch = *str;
 635         width = 0;
 636     }
 637     else
 638     {
 639         ch = res;
 640         /* Calculate UTF-8 char width */
 641         next_ch = g_utf8_next_char (str);
 642         if (next_ch)
 643         {
 644             width = next_ch - str;
 645         }
 646         else
 647         {
 648             ch = 0;
 649             width = 0;
 650         }
 651     }
 652     *char_width = width;
 653     return ch;
 654 }
 655
 656 static int
 657 dview_str_utf8_offset_to_pos (const char *text, size_t length)
 658 {
 659     ptrdiff_t result;
 660     if (text == NULL || text[0] == '\0')
 661         return length;
 662     if (g_utf8_validate (text, -1, NULL))
 663     {
 664         result = g_utf8_offset_to_pointer (text, length) - text;
 665     }
 666     else
 667     {
 668         gunichar uni;
 669         char *tmpbuf, *buffer;
 670         buffer = tmpbuf = g_strdup (text);
 671         while (tmpbuf[0] != '\0')
 672         {
 673             uni = g_utf8_get_char_validated (tmpbuf, -1);
 674             if ((uni != (gunichar) (-1)) && (uni != (gunichar) (-2)))
 675             {
 676                 tmpbuf = g_utf8_next_char (tmpbuf);
 677             }
 678             else
 679             {
 680                 tmpbuf[0] = '.';
 681                 tmpbuf++;
 682             }
 683
 684         }
 685         result = g_utf8_offset_to_pointer (tmpbuf, length) - tmpbuf;
 686         g_free (buffer);
 687     }
 688     return max (length, (size_t) result);
 689 }
 690
 691
 692 /* --------------------------------------------------------------------------------------------- */
 693 /* diff parse *************************************************************** */
 694
 695 /**
 696  * Read decimal number from string.
 697  *
 698  * \param[in,out] str string to parse
 699  * \param[out] n extracted number
 700  *
 701  * \return 0 if success, otherwise non-zero
 702  */
 703 static int
 704 scan_deci (const char **str, int *n)
 705 {
 706     const char *p = *str;
 707     char *q;
 708     errno = 0;
 709     *n = strtol (p, &q, 10);
 710     if (errno || p == q)
 711     {
 712         return -1;
 713     }
 714     *str = q;
 715     return 0;
 716 }
 717
 718 /* --------------------------------------------------------------------------------------------- */
 719
 720 /**
 721  * Parse line for diff statement.
 722  *
 723  * \param p string to parse
 724  * \param ops list of diff statements
 725  *
 726  * \return 0 if success, otherwise non-zero
 727  */
 728 static int
 729 scan_line (const char *p, GArray * ops)
 730 {
 731     DIFFCMD op;
 732
 733     int f1, f2;
 734     int t1, t2;
 735     int cmd;
 736
 737     int range;
 738
 739     /* handle the following cases:
 740      *  NUMaNUM[,NUM]
 741      *  NUM[,NUM]cNUM[,NUM]
 742      *  NUM[,NUM]dNUM
 743      * where NUM is a positive integer
 744      */
 745
 746     if (scan_deci (&p, &f1) != 0 || f1 < 0)
 747     {
 748         return -1;
 749     }
 750     f2 = f1;
 751     range = 0;
 752     if (*p == ',')
 753     {
 754         p++;
 755         if (scan_deci (&p, &f2) != 0 || f2 < f1)
 756         {
 757             return -1;
 758         }
 759         range = 1;
 760     }
 761
 762     cmd = *p++;
 763     if (cmd == 'a')
 764     {
 765         if (range)
 766         {
 767             return -1;
 768         }
 769     }
 770     else if (cmd != 'c' && cmd != 'd')
 771     {
 772         return -1;
 773     }
 774
 775     if (scan_deci (&p, &t1) != 0 || t1 < 0)
 776     {
 777         return -1;
 778     }
 779     t2 = t1;
 780     range = 0;
 781     if (*p == ',')
 782     {
 783         p++;
 784         if (scan_deci (&p, &t2) != 0 || t2 < t1)
 785         {
 786             return -1;
 787         }
 788         range = 1;
 789     }
 790
 791     if (cmd == 'd')
 792     {
 793         if (range)
 794         {
 795             return -1;
 796         }
 797     }
 798
 799     op.a[0][0] = f1;
 800     op.a[0][1] = f2;
 801     op.cmd = cmd;
 802     op.a[1][0] = t1;
 803     op.a[1][1] = t2;
 804     g_array_append_val (ops, op);
 805     return 0;
 806 }
 807
 808 /* --------------------------------------------------------------------------------------------- */
 809
 810 /**
 811  * Parse diff output and extract diff statements.
 812  *
 813  * \param f stream to read from
 814  * \param ops list of diff statements to fill
 815  *
 816  * \return positive number indicating number of hunks, otherwise negative
 817  */
 818 static int
 819 scan_diff (FBUF * f, GArray * ops)
 820 {
 821     int sz;
 822     char buf[BUFSIZ];
 823
 824     while ((sz = f_gets (buf, sizeof (buf) - 1, f)))
 825     {
 826         if (isdigit (buf[0]))
 827         {
 828             if (buf[sz - 1] != '\n')
 829             {
 830                 return -1;
 831             }
 832             buf[sz] = '\0';
 833             if (scan_line (buf, ops) != 0)
 834             {
 835                 return -1;
 836             }
 837             continue;
 838         }
 839         while (buf[sz - 1] != '\n' && (sz = f_gets (buf, sizeof (buf), f)) != 0)
 840         {
 841         }
 842     }
 843
 844     return ops->len;
 845 }
 846
 847 /* --------------------------------------------------------------------------------------------- */
 848
 849 /**
 850  * Invoke diff and extract diff statements.
 851  *
 852  * \param args extra arguments to be passed to diff
 853  * \param extra more arguments to be passed to diff
 854  * \param file1 first file to compare
 855  * \param file2 second file to compare
 856  * \param ops list of diff statements to fill
 857  *
 858  * \return positive number indicating number of hunks, otherwise negative
 859  */
 860 static int
 861 dff_execute (const char *args, const char *extra, const char *file1, const char *file2,
 862              GArray * ops)
 863 {
 864     static const char *opt =
 865         " --old-group-format='%df%(f=l?:,%dl)d%dE\n'"
 866         " --new-group-format='%dea%dF%(F=L?:,%dL)\n'"
 867         " --changed-group-format='%df%(f=l?:,%dl)c%dF%(F=L?:,%dL)\n'"
 868         " --unchanged-group-format=''";
 869
 870     int rv;
 871     FBUF *f;
 872     char *cmd;
 873     int code;
 874
 875     cmd = g_strdup_printf ("diff %s %s %s \"%s\" \"%s\"", args, extra, opt, file1, file2);
 876     if (cmd == NULL)
 877         return -1;
 878
 879     f = p_open (cmd, O_RDONLY);
 880     g_free (cmd);
 881
 882     if (f == NULL)
 883         return -1;
 884
 885     rv = scan_diff (f, ops);
 886     code = p_close (f);
 887
 888     if (rv < 0 || code == -1 || !WIFEXITED (code) || WEXITSTATUS (code) == 2)
 889         return -1;
 890
 891     return rv;
 892 }
 893
 894 /* --------------------------------------------------------------------------------------------- */
 895
 896 /**
 897  * Reparse and display file according to diff statements.
 898  *
 899  * \param ord 0 if displaying first file, 1 if displaying 2nd file
 900  * \param filename file name to display
 901  * \param ops list of diff statements
 902  * \param printer printf-like function to be used for displaying
 903  * \param ctx printer context
 904  *
 905  * \return 0 if success, otherwise non-zero
 906  */
 907 static int
 908 dff_reparse (int ord, const char *filename, const GArray * ops, DFUNC printer, void *ctx)
 909 {
 910     size_t i;
 911     FBUF *f;
 912     size_t sz;
 913     char buf[BUFSIZ];
 914     int line = 0;
 915     off_t off = 0;
 916     const DIFFCMD *op;
 917     int eff;
 918     int add_cmd;
 919     int del_cmd;
 920
 921     f = f_open (filename, O_RDONLY);
 922     if (f == NULL)
 923     {
 924         return -1;
 925     }
 926
 927     ord &= 1;
 928     eff = ord;
 929
 930     add_cmd = 'a';
 931     del_cmd = 'd';
 932     if (ord)
 933     {
 934         add_cmd = 'd';
 935         del_cmd = 'a';
 936     }
 937 #define F1 a[eff][0]
 938 #define F2 a[eff][1]
 939 #define T1 a[ ord^1 ][0]
 940 #define T2 a[ ord^1 ][1]
 941     for (i = 0; i < ops->len; i++)
 942     {
 943         int n;
 944         op = &g_array_index (ops, DIFFCMD, i);
 945         n = op->F1 - (op->cmd != add_cmd);
 946         while (line < n && (sz = f_gets (buf, sizeof (buf), f)) != 0)
 947         {
 948             line++;
 949             printer (ctx, EQU_CH, line, off, sz, buf);
 950             off += sz;
 951             while (buf[sz - 1] != '\n')
 952             {
 953                 sz = f_gets (buf, sizeof (buf), f);
 954                 if (sz == 0)
 955                 {
 956                     printer (ctx, 0, 0, 0, 1, "\n");
 957                     break;
 958                 }
 959                 printer (ctx, 0, 0, 0, sz, buf);
 960                 off += sz;
 961             }
 962         }
 963         if (line != n)
 964         {
 965             goto err;
 966         }
 967
 968         if (op->cmd == add_cmd)
 969         {
 970             n = op->T2 - op->T1 + 1;
 971             while (n)
 972             {
 973                 printer (ctx, DEL_CH, 0, 0, 1, "\n");
 974                 n--;
 975             }
 976         }
 977         if (op->cmd == del_cmd)
 978         {
 979             n = op->F2 - op->F1 + 1;
 980             while (n != 0 && (sz = f_gets (buf, sizeof (buf), f)) != 0)
 981             {
 982                 line++;
 983                 printer (ctx, ADD_CH, line, off, sz, buf);
 984                 off += sz;
 985                 while (buf[sz - 1] != '\n')
 986                 {
 987                     sz = f_gets (buf, sizeof (buf), f);
 988                     if (sz == 0)
 989                     {
 990                         printer (ctx, 0, 0, 0, 1, "\n");
 991                         break;
 992                     }
 993                     printer (ctx, 0, 0, 0, sz, buf);
 994                     off += sz;
 995                 }
 996                 n--;
 997             }
 998             if (n)
 999             {
1000                 goto err;
1001             }
1002         }
1003         if (op->cmd == 'c')
1004         {
1005             n = op->F2 - op->F1 + 1;
1006             while (n != 0 && (sz = f_gets (buf, sizeof (buf), f)) != 0)
1007             {
1008                 line++;
1009                 printer (ctx, CHG_CH, line, off, sz, buf);
1010                 off += sz;
1011                 while (buf[sz - 1] != '\n')
1012                 {
1013                     sz = f_gets (buf, sizeof (buf), f);
1014                     if (sz == 0)
1015                     {
1016                         printer (ctx, 0, 0, 0, 1, "\n");
1017                         break;
1018                     }
1019                     printer (ctx, 0, 0, 0, sz, buf);
1020                     off += sz;
1021                 }
1022                 n--;
1023             }
1024             if (n)
1025             {
1026                 goto err;
1027             }
1028             n = op->T2 - op->T1 - (op->F2 - op->F1);
1029             while (n > 0)
1030             {
1031                 printer (ctx, CHG_CH, 0, 0, 1, "\n");
1032                 n--;
1033             }
1034         }
1035     }
1036 #undef T2
1037 #undef T1
1038 #undef F2
1039 #undef F1
1040
1041     while ((sz = f_gets (buf, sizeof (buf), f)) != 0)
1042     {
1043         line++;
1044         printer (ctx, EQU_CH, line, off, sz, buf);
1045         off += sz;
1046         while (buf[sz - 1] != '\n')
1047         {
1048             sz = f_gets (buf, sizeof (buf), f);
1049             if (sz == 0)
1050             {
1051                 printer (ctx, 0, 0, 0, 1, "\n");
1052                 break;
1053             }
1054             printer (ctx, 0, 0, 0, sz, buf);
1055             off += sz;
1056         }
1057     }
1058
1059     f_close (f);
1060     return 0;
1061
1062   err:
1063     f_close (f);
1064     return -1;
1065 }
1066
1067 /* --------------------------------------------------------------------------------------------- */
1068 /* horizontal diff ********************************************************** */
1069
1070 /**
1071  * Longest common substring.
1072  *
1073  * \param s first string
1074  * \param m length of first string
1075  * \param t second string
1076  * \param n length of second string
1077  * \param ret list of offsets for longest common substrings inside each string
1078  * \param min minimum length of common substrings
1079  *
1080  * \return 0 if success, nonzero otherwise
1081  */
1082 static int
1083 lcsubstr (const char *s, int m, const char *t, int n, GArray * ret, int min)
1084 {
1085     int i, j;
1086
1087     int *Lprev, *Lcurr;
1088
1089     int z = 0;
1090
1091     if (m < min || n < min)
1092     {
1093         /* XXX early culling */
1094         return 0;
1095     }
1096
1097     Lprev = g_new0 (int, n + 1);
1098     Lcurr = g_new0 (int, n + 1);
1099
1100     if (Lprev == NULL || Lcurr == NULL)
1101     {
1102         g_free (Lprev);
1103         g_free (Lcurr);
1104         return -1;
1105     }
1106
1107     for (i = 0; i < m; i++)
1108     {
1109         int *L = Lprev;
1110         Lprev = Lcurr;
1111         Lcurr = L;
1112 #ifdef USE_MEMSET_IN_LCS
1113         memset (Lcurr, 0, (n + 1) * sizeof (int));
1114 #endif
1115         for (j = 0; j < n; j++)
1116         {
1117 #ifndef USE_MEMSET_IN_LCS
1118             Lcurr[j + 1] = 0;
1119 #endif
1120             if (s[i] == t[j])
1121             {
1122                 int v = Lprev[j] + 1;
1123                 Lcurr[j + 1] = v;
1124                 if (z < v)
1125                 {
1126                     z = v;
1127                     g_array_set_size (ret, 0);
1128                 }
1129                 if (z == v && z >= min)
1130                 {
1131                     int off0 = i - z + 1;
1132                     int off1 = j - z + 1;
1133                     size_t k;
1134                     for (k = 0; k < ret->len; k++)
1135                     {
1136                         PAIR *p = (PAIR *) g_array_index (ret, PAIR, k);
1137                         if ((*p)[0] == off0)
1138                         {
1139                             break;
1140                         }
1141                         if ((*p)[1] >= off1)
1142                         {
1143                             break;
1144                         }
1145                     }
1146                     if (k == ret->len)
1147                     {
1148                         PAIR p2;
1149                         p2[0] = off0;
1150                         p2[1] = off1;
1151                         g_array_append_val (ret, p2);
1152                     }
1153                 }
1154             }
1155         }
1156     }
1157
1158     free (Lcurr);
1159     free (Lprev);
1160     return z;
1161
1162     free (Lcurr);
1163     free (Lprev);
1164     return -1;
1165 }
1166
1167 /* --------------------------------------------------------------------------------------------- */
1168
1169 /**
1170  * Scan recursively for common substrings and build ranges.
1171  *
1172  * \param s first string
1173  * \param t second string
1174  * \param bracket current limits for both of the strings
1175  * \param min minimum length of common substrings
1176  * \param hdiff list of horizontal diff ranges to fill
1177  * \param depth recursion depth
1178  *
1179  * \return 0 if success, nonzero otherwise
1180  */
1181 static gboolean
1182 hdiff_multi (const char *s, const char *t, const BRACKET bracket, int min, GArray * hdiff,
1183              unsigned int depth)
1184 {
1185     BRACKET p;
1186
1187     if (depth--)
1188     {
1189         GArray *ret;
1190         BRACKET b;
1191         int len;
1192         ret = g_array_new (FALSE, TRUE, sizeof (PAIR));
1193         if (ret == NULL)
1194             return FALSE;
1195
1196         len = lcsubstr (s + bracket[0].off, bracket[0].len,
1197                         t + bracket[1].off, bracket[1].len, ret, min);
1198         if (ret->len)
1199         {
1200             size_t k = 0;
1201             const PAIR *data = (const PAIR *) &g_array_index (ret, PAIR, 0);
1202             const PAIR *data2;
1203
1204             b[0].off = bracket[0].off;
1205             b[0].len = (*data)[0];
1206             b[1].off = bracket[1].off;
1207             b[1].len = (*data)[1];
1208             if (!hdiff_multi (s, t, b, min, hdiff, depth))
1209                 return FALSE;
1210
1211             for (k = 0; k < ret->len - 1; k++)
1212             {
1213                 data = (const PAIR *) &g_array_index (ret, PAIR, k);
1214                 data2 = (const PAIR *) &g_array_index (ret, PAIR, k + 1);
1215                 b[0].off = bracket[0].off + (*data)[0] + len;
1216                 b[0].len = (*data2)[0] - (*data)[0] - len;
1217                 b[1].off = bracket[1].off + (*data)[1] + len;
1218                 b[1].len = (*data2)[1] - (*data)[1] - len;
1219                 if (!hdiff_multi (s, t, b, min, hdiff, depth))
1220                     return FALSE;
1221             }
1222             data = (const PAIR *) &g_array_index (ret, PAIR, k);
1223             b[0].off = bracket[0].off + (*data)[0] + len;
1224             b[0].len = bracket[0].len - (*data)[0] - len;
1225             b[1].off = bracket[1].off + (*data)[1] + len;
1226             b[1].len = bracket[1].len - (*data)[1] - len;
1227             if (!hdiff_multi (s, t, b, min, hdiff, depth))
1228                 return FALSE;
1229
1230             g_array_free (ret, TRUE);
1231             return TRUE;
1232         }
1233     }
1234
1235     p[0].off = bracket[0].off;
1236     p[0].len = bracket[0].len;
1237     p[1].off = bracket[1].off;
1238     p[1].len = bracket[1].len;
1239     g_array_append_val (hdiff, p);
1240
1241     return TRUE;
1242 }
1243
1244 /* --------------------------------------------------------------------------------------------- */
1245
1246 /**
1247  * Build list of horizontal diff ranges.
1248  *
1249  * \param s first string
1250  * \param m length of first string
1251  * \param t second string
1252  * \param n length of second string
1253  * \param min minimum length of common substrings
1254  * \param hdiff list of horizontal diff ranges to fill
1255  * \param depth recursion depth
1256  *
1257  * \return 0 if success, nonzero otherwise
1258  */
1259 static gboolean
1260 hdiff_scan (const char *s, int m, const char *t, int n, int min, GArray * hdiff, unsigned int depth)
1261 {
1262     int i;
1263     BRACKET b;
1264
1265     /* dumbscan (single horizontal diff) -- does not compress whitespace */
1266     for (i = 0; i < m && i < n && s[i] == t[i]; i++)
1267         ;
1268     for (; m > i && n > i && s[m - 1] == t[n - 1]; m--, n--)
1269         ;
1270
1271     b[0].off = i;
1272     b[0].len = m - i;
1273     b[1].off = i;
1274     b[1].len = n - i;
1275
1276     /* smartscan (multiple horizontal diff) */
1277     return hdiff_multi (s, t, b, min, hdiff, depth);
1278 }
1279
1280 /* --------------------------------------------------------------------------------------------- */
1281 /* read line **************************************************************** */
1282
1283 /**
1284  * Check if character is inside horizontal diff limits.
1285  *
1286  * \param k rank of character inside line
1287  * \param hdiff horizontal diff structure
1288  * \param ord 0 if reading from first file, 1 if reading from 2nd file
1289  *
1290  * \return TRUE if inside hdiff limits, FALSE otherwise
1291  */
1292 static int
1293 is_inside (int k, GArray * hdiff, int ord)
1294 {
1295     size_t i;
1296     BRACKET *b;
1297     for (i = 0; i < hdiff->len; i++)
1298     {
1299         int start, end;
1300         b = &g_array_index (hdiff, BRACKET, i);
1301
1302         start = (*b)[ord].off;
1303         end = start + (*b)[ord].len;
1304         if (k >= start && k < end)
1305         {
1306             return 1;
1307         }
1308     }
1309     return 0;
1310 }
1311
1312 /* --------------------------------------------------------------------------------------------- */
1313
1314 /**
1315  * Copy `src' to `dst' expanding tabs.
1316  *
1317  * \param dst destination buffer
1318  * \param src source buffer
1319  * \param srcsize size of src buffer
1320  * \param base virtual base of this string, needed to calculate tabs
1321  * \param ts tab size
1322  *
1323  * \return new virtual base
1324  *
1325  * \note The procedure returns when all bytes are consumed from `src'
1326  */
1327 static int
1328 cvt_cpy (char *dst, const char *src, size_t srcsize, int base, int ts)
1329 {
1330     int i;
1331     for (i = 0; srcsize != 0; i++, src++, dst++, srcsize--)
1332     {
1333         *dst = *src;
1334         if (*src == '\t')
1335         {
1336             int j = TAB_SKIP (ts, i + base);
1337             i += j - 1;
1338             while (j-- > 0)
1339             {
1340                 *dst++ = ' ';
1341             }
1342             dst--;
1343         }
1344     }
1345     return i + base;
1346 }
1347
1348 /* --------------------------------------------------------------------------------------------- */
1349
1350 /**
1351  * Copy `src' to `dst' expanding tabs.
1352  *
1353  * \param dst destination buffer
1354  * \param dstsize size of dst buffer
1355  * \param[in,out] _src source buffer
1356  * \param srcsize size of src buffer
1357  * \param base virtual base of this string, needed to calculate tabs
1358  * \param ts tab size
1359  *
1360  * \return new virtual base
1361  *
1362  * \note The procedure returns when all bytes are consumed from `src'
1363  *       or `dstsize' bytes are written to `dst'
1364  * \note Upon return, `src' points to the first unwritten character in source
1365  */
1366 static int
1367 cvt_ncpy (char *dst, int dstsize, const char **_src, size_t srcsize, int base, int ts)
1368 {
1369     int i;
1370     const char *src = *_src;
1371     for (i = 0; i < dstsize && srcsize != 0; i++, src++, dst++, srcsize--)
1372     {
1373         *dst = *src;
1374         if (*src == '\t')
1375         {
1376             int j = TAB_SKIP (ts, i + base);
1377             if (j > dstsize - i)
1378             {
1379                 j = dstsize - i;
1380             }
1381             i += j - 1;
1382             while (j-- > 0)
1383             {
1384                 *dst++ = ' ';
1385             }
1386             dst--;
1387         }
1388     }
1389     *_src = src;
1390     return i + base;
1391 }
1392
1393 /* --------------------------------------------------------------------------------------------- */
1394
1395 /**
1396  * Read line from memory, converting tabs to spaces and padding with spaces.
1397  *
1398  * \param src buffer to read from
1399  * \param srcsize size of src buffer
1400  * \param dst buffer to read to
1401  * \param dstsize size of dst buffer, excluding trailing null
1402  * \param skip number of characters to skip
1403  * \param ts tab size
1404  * \param show_cr show trailing carriage return as ^M
1405  *
1406  * \return negative on error, otherwise number of bytes except padding
1407  */
1408 static int
1409 cvt_mget (const char *src, size_t srcsize, char *dst, int dstsize, int skip, int ts, int show_cr)
1410 {
1411     int sz = 0;
1412     if (src != NULL)
1413     {
1414         int i;
1415         char *tmp = dst;
1416         const int base = 0;
1417         for (i = 0; dstsize != 0 && srcsize != 0 && *src != '\n'; i++, src++, srcsize--)
1418         {
1419             if (*src == '\t')
1420             {
1421                 int j = TAB_SKIP (ts, i + base);
1422                 i += j - 1;
1423                 while (j-- > 0)
1424                 {
1425                     if (skip > 0)
1426                     {
1427                         skip--;
1428                     }
1429                     else if (dstsize != 0)
1430                     {
1431                         dstsize--;
1432                         *dst++ = ' ';
1433                     }
1434                 }
1435             }
1436             else if (src[0] == '\r' && (srcsize == 1 || src[1] == '\n'))
1437             {
1438                 if (skip == 0 && show_cr)
1439                 {
1440                     if (dstsize > 1)
1441                     {
1442                         dstsize -= 2;
1443                         *dst++ = '^';
1444                         *dst++ = 'M';
1445                     }
1446                     else
1447                     {
1448                         dstsize--;
1449                         *dst++ = '.';
1450                     }
1451                 }
1452                 break;
1453             }
1454             else
1455             {
1456                 if (skip > 0)
1457                 {
1458                     int utf_ch = 0;
1459                     gboolean res;
1460                     int w;
1461
1462                     skip--;
1463                     utf_ch = dview_get_utf ((char *) src, &w, &res);
1464                     if (w > 1)
1465                         skip += w - 1;
1466                     if (!g_unichar_isprint (utf_ch))
1467                         utf_ch = '.';
1468                 }
1469                 else
1470                 {
1471                     dstsize--;
1472                     *dst++ = *src;
1473                 }
1474             }
1475         }
1476         sz = dst - tmp;
1477     }
1478     while (dstsize != 0)
1479     {
1480         dstsize--;
1481         *dst++ = ' ';
1482     }
1483     *dst = '\0';
1484     return sz;
1485 }
1486
1487 /* --------------------------------------------------------------------------------------------- */
1488
1489 /**
1490  * Read line from memory and build attribute array.
1491  *
1492  * \param src buffer to read from
1493  * \param srcsize size of src buffer
1494  * \param dst buffer to read to
1495  * \param dstsize size of dst buffer, excluding trailing null
1496  * \param skip number of characters to skip
1497  * \param ts tab size
1498  * \param show_cr show trailing carriage return as ^M
1499  * \param hdiff horizontal diff structure
1500  * \param ord 0 if reading from first file, 1 if reading from 2nd file
1501  * \param att buffer of attributes
1502  *
1503  * \return negative on error, otherwise number of bytes except padding
1504  */
1505 static int
1506 cvt_mgeta (const char *src, size_t srcsize, char *dst, int dstsize, int skip, int ts, int show_cr,
1507            GArray * hdiff, int ord, char *att)
1508 {
1509     int sz = 0;
1510     if (src != NULL)
1511     {
1512         int i, k;
1513         char *tmp = dst;
1514         const int base = 0;
1515         for (i = 0, k = 0; dstsize != 0 && srcsize != 0 && *src != '\n'; i++, k++, src++, srcsize--)
1516         {
1517             if (*src == '\t')
1518             {
1519                 int j = TAB_SKIP (ts, i + base);
1520                 i += j - 1;
1521                 while (j-- > 0)
1522                 {
1523                     if (skip != 0)
1524                     {
1525                         skip--;
1526                     }
1527                     else if (dstsize != 0)
1528                     {
1529                         dstsize--;
1530                         *att++ = is_inside (k, hdiff, ord);
1531                         *dst++ = ' ';
1532                     }
1533                 }
1534             }
1535             else if (src[0] == '\r' && (srcsize == 1 || src[1] == '\n'))
1536             {
1537                 if (skip == 0 && show_cr)
1538                 {
1539                     if (dstsize > 1)
1540                     {
1541                         dstsize -= 2;
1542                         *att++ = is_inside (k, hdiff, ord);
1543                         *dst++ = '^';
1544                         *att++ = is_inside (k, hdiff, ord);
1545                         *dst++ = 'M';
1546                     }
1547                     else
1548                     {
1549                         dstsize--;
1550                         *att++ = is_inside (k, hdiff, ord);
1551                         *dst++ = '.';
1552                     }
1553                 }
1554                 break;
1555             }
1556             else
1557             {
1558                 if (skip != 0)
1559                 {
1560                     int utf_ch = 0;
1561                     gboolean res;
1562                     int w;
1563
1564                     skip--;
1565                     utf_ch = dview_get_utf ((char *) src, &w, &res);
1566                     if (w > 1)
1567                         skip += w - 1;
1568                     if (!g_unichar_isprint (utf_ch))
1569                         utf_ch = '.';
1570                 }
1571                 else
1572                 {
1573                     dstsize--;
1574                     *att++ = is_inside (k, hdiff, ord);
1575                     *dst++ = *src;
1576                 }
1577             }
1578         }
1579         sz = dst - tmp;
1580     }
1581     while (dstsize != 0)
1582     {
1583         dstsize--;
1584         *att++ = 0;
1585         *dst++ = ' ';
1586     }
1587     *dst = '\0';
1588     return sz;
1589 }
1590
1591 /* --------------------------------------------------------------------------------------------- */
1592
1593 /**
1594  * Read line from file, converting tabs to spaces and padding with spaces.
1595  *
1596  * \param f file stream to read from
1597  * \param off offset of line inside file
1598  * \param dst buffer to read to
1599  * \param dstsize size of dst buffer, excluding trailing null
1600  * \param skip number of characters to skip
1601  * \param ts tab size
1602  * \param show_cr show trailing carriage return as ^M
1603  *
1604  * \return negative on error, otherwise number of bytes except padding
1605  */
1606 static int
1607 cvt_fget (FBUF * f, off_t off, char *dst, size_t dstsize, int skip, int ts, int show_cr)
1608 {
1609     int base = 0;
1610     int old_base = base;
1611     const int amount = dstsize;
1612
1613     size_t useful, offset;
1614
1615     size_t i;
1616     size_t sz;
1617
1618     int lastch = '\0';
1619
1620     const char *q = NULL;
1621     char tmp[BUFSIZ];           /* XXX capacity must be >= max{dstsize + 1, amount} */
1622     char cvt[BUFSIZ];           /* XXX capacity must be >= MAX_TAB_WIDTH * amount */
1623
1624     if ((int) sizeof (tmp) < amount || (int) sizeof (tmp) <= dstsize
1625         || (int) sizeof (cvt) < 8 * amount)
1626     {
1627         /* abnormal, but avoid buffer overflow */
1628         memset (dst, ' ', dstsize);
1629         dst[dstsize] = '\0';
1630         return 0;
1631     }
1632
1633     f_seek (f, off, SEEK_SET);
1634
1635     while (skip > base)
1636     {
1637         old_base = base;
1638         sz = f_gets (tmp, amount, f);
1639         if (sz == 0)
1640             break;
1641
1642         base = cvt_cpy (cvt, tmp, sz, old_base, ts);
1643         if (cvt[base - old_base - 1] == '\n')
1644         {
1645             q = &cvt[base - old_base - 1];
1646             base = old_base + q - cvt + 1;
1647             break;
1648         }
1649     }
1650
1651     useful = base - skip;
1652     offset = skip - old_base;
1653
1654     if (useful < 0)
1655     {
1656         memset (dst, ' ', dstsize);
1657         dst[dstsize] = '\0';
1658         return 0;
1659     }
1660
1661     if (useful <= dstsize)
1662     {
1663         if (useful != 0)
1664             memmove (dst, cvt + offset, useful);
1665
1666         if (q == NULL)
1667         {
1668             sz = f_gets (tmp, dstsize - useful + 1, f);
1669             if (sz != 0)
1670             {
1671                 const char *ptr = tmp;
1672                 useful += cvt_ncpy (dst + useful, dstsize - useful, &ptr, sz, base, ts) - base;
1673                 if (ptr < tmp + sz)
1674                     lastch = *ptr;
1675             }
1676         }
1677         sz = useful;
1678     }
1679     else
1680     {
1681         memmove (dst, cvt + offset, dstsize);
1682         sz = dstsize;
1683         lastch = cvt[offset + dstsize];
1684     }
1685
1686     dst[sz] = lastch;
1687     for (i = 0; i < sz && dst[i] != '\n'; i++)
1688     {
1689         if (dst[i] == '\r' && dst[i + 1] == '\n')
1690         {
1691             if (show_cr)
1692             {
1693                 if (i + 1 < dstsize)
1694                 {
1695                     dst[i++] = '^';
1696                     dst[i++] = 'M';
1697                 }
1698                 else
1699                 {
1700                     dst[i++] = '*';
1701                 }
1702             }
1703             break;
1704         }
1705     }
1706     for (; i < dstsize; i++)
1707     {
1708         dst[i] = ' ';
1709     }
1710     dst[i] = '\0';
1711     return sz;
1712 }
1713
1714 /* --------------------------------------------------------------------------------------------- */
1715 /* diff printers et al ****************************************************** */
1716
1717 static void
1718 cc_free_elt (void *elt)
1719 {
1720     DIFFLN *p = elt;
1721     if (p != NULL)
1722     {
1723         g_free (p->p);
1724     }
1725 }
1726
1727 /* --------------------------------------------------------------------------------------------- */
1728
1729 static int
1730 printer (void *ctx, int ch, int line, off_t off, size_t sz, const char *str)
1731 {
1732     GArray *a = ((PRINTER_CTX *) ctx)->a;
1733     DSRC dsrc = ((PRINTER_CTX *) ctx)->dsrc;
1734     if (ch)
1735     {
1736         DIFFLN p;
1737         p.p = NULL;
1738         p.ch = ch;
1739         p.line = line;
1740         p.u.off = off;
1741         if (dsrc == DATA_SRC_MEM && line != 0)
1742         {
1743             if (sz != 0 && str[sz - 1] == '\n')
1744             {
1745                 sz--;
1746             }
1747             if (sz > 0)
1748                 p.p = g_strndup (str, sz);
1749             p.u.len = sz;
1750         }
1751         g_array_append_val (a, p);
1752     }
1753     else if (dsrc == DATA_SRC_MEM)
1754     {
1755         DIFFLN *p;
1756         p = &g_array_index (a, DIFFLN, a->len - 1);
1757         if (sz != 0 && str[sz - 1] == '\n')
1758         {
1759             sz--;
1760         }
1761         if (sz != 0)
1762         {
1763             size_t new_size = p->u.len + sz;
1764             char *q = g_realloc (p->p, new_size);
1765             memcpy (q + p->u.len, str, sz);
1766             p->p = q;
1767         }
1768         p->u.len += sz;
1769     }
1770     if (dsrc == DATA_SRC_TMP && (line != 0 || ch == 0))
1771     {
1772         FBUF *f = ((PRINTER_CTX *) ctx)->f;
1773         f_write (f, str, sz);
1774     }
1775     return 0;
1776 }
1777
1778 /* --------------------------------------------------------------------------------------------- */
1779
1780 static int
1781 redo_diff (WDiff * dview)
1782 {
1783     FBUF *const *f = dview->f;
1784
1785     PRINTER_CTX ctx;
1786     GArray *ops;
1787     int ndiff;
1788     int rv;
1789
1790     char extra[256];
1791
1792     extra[0] = '\0';
1793     if (dview->opt.quality == 2)
1794     {
1795         strcat (extra, " -d");
1796     }
1797     if (dview->opt.quality == 1)
1798     {
1799         strcat (extra, " --speed-large-files");
1800     }
1801     if (dview->opt.strip_trailing_cr)
1802     {
1803         strcat (extra, " --strip-trailing-cr");
1804     }
1805     if (dview->opt.ignore_tab_expansion)
1806     {
1807         strcat (extra, " -E");
1808     }
1809     if (dview->opt.ignore_space_change)
1810     {
1811         strcat (extra, " -b");
1812     }
1813     if (dview->opt.ignore_all_space)
1814     {
1815         strcat (extra, " -w");
1816     }
1817     if (dview->opt.ignore_case)
1818     {
1819         strcat (extra, " -i");
1820     }
1821
1822     if (dview->dsrc != DATA_SRC_MEM)
1823     {
1824         f_reset (f[0]);
1825         f_reset (f[1]);
1826     }
1827
1828     ops = g_array_new (FALSE, FALSE, sizeof (DIFFCMD));
1829     ndiff = dff_execute (dview->args, extra, dview->file[0], dview->file[1], ops);
1830     if (ndiff < 0)
1831     {
1832         g_array_free (ops, TRUE);
1833         return -1;
1834     }
1835
1836     ctx.dsrc = dview->dsrc;
1837
1838     rv = 0;
1839     ctx.a = dview->a[0];
1840     ctx.f = f[0];
1841     rv |= dff_reparse (0, dview->file[0], ops, printer, &ctx);
1842
1843     ctx.a = dview->a[1];
1844     ctx.f = f[1];
1845     rv |= dff_reparse (1, dview->file[1], ops, printer, &ctx);
1846
1847     g_array_free (ops, TRUE);
1848
1849     if (rv != 0 || dview->a[0]->len != dview->a[1]->len)
1850         return -1;
1851
1852     if (dview->dsrc == DATA_SRC_TMP)
1853     {
1854         f_trunc (f[0]);
1855         f_trunc (f[1]);
1856     }
1857
1858     if (dview->dsrc == DATA_SRC_MEM && HDIFF_ENABLE)
1859     {
1860         dview->hdiff = g_ptr_array_new ();
1861         if (dview->hdiff != NULL)
1862         {
1863             size_t i;
1864             const DIFFLN *p;
1865             const DIFFLN *q;
1866             for (i = 0; i < dview->a[0]->len; i++)
1867             {
1868                 GArray *h = NULL;
1869                 p = &g_array_index (dview->a[0], DIFFLN, i);
1870                 q = &g_array_index (dview->a[1], DIFFLN, i);
1871                 if (p->line && q->line && p->ch == CHG_CH)
1872                 {
1873                     h = g_array_new (FALSE, FALSE, sizeof (BRACKET));
1874                     if (h != NULL)
1875                     {
1876                         gboolean runresult =
1877                             hdiff_scan (p->p, p->u.len, q->p, q->u.len, HDIFF_MINCTX, h,
1878                                         HDIFF_DEPTH);
1879                         if (!runresult)
1880                         {
1881                             g_array_free (h, TRUE);
1882                             h = NULL;
1883                         }
1884                     }
1885                 }
1886                 g_ptr_array_add (dview->hdiff, h);
1887             }
1888         }
1889     }
1890     return ndiff;
1891 }
1892
1893 /* --------------------------------------------------------------------------------------------- */
1894
1895 static void
1896 destroy_hdiff (WDiff * dview)
1897 {
1898     if (dview->hdiff != NULL)
1899     {
1900         int i;
1901         int len = dview->a[0]->len;
1902         for (i = 0; i < len; i++)
1903         {
1904             GArray *h = (GArray *) g_ptr_array_index (dview->hdiff, i);
1905             if (h != NULL)
1906             {
1907                 g_array_free (h, TRUE);
1908             }
1909         }
1910         g_ptr_array_free (dview->hdiff, TRUE);
1911         dview->hdiff = NULL;
1912     }
1913
1914     mc_search_free (dview->search.handle);
1915     dview->search.handle = NULL;
1916     g_free (dview->search.last_string);
1917     dview->search.last_string = NULL;
1918 }
1919
1920 /* --------------------------------------------------------------------------------------------- */
1921 /* stuff ******************************************************************** */
1922
1923 static int
1924 get_digits (unsigned int n)
1925 {
1926     int d = 1;
1927     while (n /= 10)
1928     {
1929         d++;
1930     }
1931     return d;
1932 }
1933
1934 /* --------------------------------------------------------------------------------------------- */
1935
1936 static int
1937 get_line_numbers (const GArray * a, size_t pos, int *linenum, int *lineofs)
1938 {
1939     const DIFFLN *p;
1940
1941     *linenum = 0;
1942     *lineofs = 0;
1943
1944     if (a->len != 0)
1945     {
1946         if (pos >= a->len)
1947         {
1948             pos = a->len - 1;
1949         }
1950
1951         p = &g_array_index (a, DIFFLN, pos);
1952
1953         if (p->line == 0)
1954         {
1955             int n;
1956             for (n = pos; n > 0; n--)
1957             {
1958                 p--;
1959                 if (p->line != 0)
1960                 {
1961                     break;
1962                 }
1963             }
1964             *lineofs = pos - n + 1;
1965         }
1966
1967         *linenum = p->line;
1968     }
1969     return 0;
1970 }
1971
1972 /* --------------------------------------------------------------------------------------------- */
1973
1974 static int
1975 calc_nwidth (const GArray ** const a)
1976 {
1977     int l1, o1;
1978     int l2, o2;
1979     get_line_numbers (a[0], a[0]->len - 1, &l1, &o1);
1980     get_line_numbers (a[1], a[1]->len - 1, &l2, &o2);
1981     if (l1 < l2)
1982     {
1983         l1 = l2;
1984     }
1985     return get_digits (l1);
1986 }
1987
1988 /* --------------------------------------------------------------------------------------------- */
1989
1990 static int
1991 find_prev_hunk (const GArray * a, int pos)
1992 {
1993 #if 1
1994     while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH)
1995     {
1996         pos--;
1997     }
1998     while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch == EQU_CH)
1999     {
2000         pos--;
2001     }
2002     while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH)
2003     {
2004         pos--;
2005     }
2006     if (pos > 0 && (size_t) pos < a->len)
2007         pos++;
2008 #else
2009     while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos - 1))->ch == EQU_CH)
2010     {
2011         pos--;
2012     }
2013     while (pos > 0 && ((DIFFLN *) & g_array_index (a, DIFFLN, pos - 1))->ch != EQU_CH)
2014     {
2015         pos--;
2016     }
2017 #endif
2018
2019     return pos;
2020 }
2021
2022 /* --------------------------------------------------------------------------------------------- */
2023
2024 static size_t
2025 find_next_hunk (const GArray * a, size_t pos)
2026 {
2027     while (pos < a->len && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch != EQU_CH)
2028     {
2029         pos++;
2030     }
2031     while (pos < a->len && ((DIFFLN *) & g_array_index (a, DIFFLN, pos))->ch == EQU_CH)
2032     {
2033         pos++;
2034     }
2035     return pos;
2036 }
2037
2038 /**
2039  * Find start and end lines of the current hunk.
2040  *
2041  * \param dview - widget WDiff
2042  * \return boolean and
2043  * start_line1 first line of current hunk (file[0])
2044  * end_line1 last line of current hunk (file[0])
2045  * start_line1 first line of current hunk (file[0])
2046  * end_line1 last line of current hunk (file[0])
2047  */
2048 static int
2049 get_current_hunk (WDiff * dview, int *start_line1, int *end_line1, int *start_line2, int *end_line2)
2050 {
2051     const GArray *a0 = dview->a[0];
2052     const GArray *a1 = dview->a[1];
2053     size_t pos;
2054     int ch;
2055     int res = 0;
2056
2057     *start_line1 = 1;
2058     *start_line2 = 1;
2059     *end_line1 = 1;
2060     *end_line2 = 1;
2061
2062     pos = dview->skip_rows;
2063     ch = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch;
2064     if (ch != EQU_CH)
2065     {
2066         switch (ch)
2067         {
2068         case ADD_CH:
2069             res = DIFF_DEL;
2070             break;
2071         case DEL_CH:
2072             res = DIFF_ADD;
2073             break;
2074         case CHG_CH:
2075             res = DIFF_CHG;
2076             break;
2077         }
2078         while (pos > 0 && ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch != EQU_CH)
2079         {
2080             pos--;
2081         }
2082         if (pos > 0)
2083         {
2084             *start_line1 = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->line + 1;
2085             *start_line2 = ((DIFFLN *) & g_array_index (a1, DIFFLN, pos))->line + 1;
2086         }
2087         pos = dview->skip_rows;
2088         while (pos < a0->len && ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->ch != EQU_CH)
2089         {
2090             int l0, l1;
2091             l0 = ((DIFFLN *) & g_array_index (a0, DIFFLN, pos))->line;
2092             l1 = ((DIFFLN *) & g_array_index (a1, DIFFLN, pos))->line;
2093             if (l0 > 0)
2094                 *end_line1 = max (*start_line1, l0);
2095             if (l1 > 0)
2096                 *end_line2 = max (*start_line2, l1);
2097             pos++;
2098         }
2099     }
2100     return res;
2101 }
2102
2103 static void
2104 dview_remove_hunk (WDiff * dview, FILE * merge_file, int from1, int to1)
2105 {
2106     int line;
2107     char buf[BUF_10K];
2108     FILE *f0;
2109     f0 = fopen (dview->file[0], "r");
2110     line = 0;
2111     while (fgets (buf, sizeof (buf), f0) != NULL && line < from1 - 1)
2112     {
2113         line++;
2114         fputs (buf, merge_file);
2115     }
2116     while (fgets (buf, sizeof (buf), f0) != NULL)
2117     {
2118         line++;
2119         if (line >= to1)
2120             fputs (buf, merge_file);
2121     }
2122     fclose (f0);
2123 }
2124
2125 static void
2126 dview_add_hunk (WDiff * dview, FILE * merge_file, int from1, int from2, int to2)
2127 {
2128     int line;
2129     char buf[BUF_10K];
2130     FILE *f0;
2131     FILE *f1;
2132     f0 = fopen (dview->file[0], "r");
2133     f1 = fopen (dview->file[1], "r");
2134     line = 0;
2135     while (fgets (buf, sizeof (buf), f0) != NULL && line < from1 - 1)
2136     {
2137         line++;
2138         fputs (buf, merge_file);
2139     }
2140     line = 0;
2141     while (fgets (buf, sizeof (buf), f1) != NULL && line <= to2)
2142     {
2143         line++;
2144         if (line >= from2)
2145             fputs (buf, merge_file);
2146     }
2147     while (fgets (buf, sizeof (buf), f0) != NULL)
2148     {
2149         fputs (buf, merge_file);
2150     }
2151     fclose (f0);
2152     fclose (f1);
2153 }
2154
2155 static void
2156 dview_replace_hunk (WDiff * dview, FILE * merge_file, int from1, int to1, int from2, int to2)
2157 {
2158     int line1, line2;
2159     char buf[BUF_10K];
2160     FILE *f0;
2161     FILE *f1;
2162     f0 = fopen (dview->file[0], "r");
2163     f1 = fopen (dview->file[1], "r");
2164     line1 = 0;
2165     while (fgets (buf, sizeof (buf), f0) != NULL && line1 < from1 - 1)
2166     {
2167         line1++;
2168         fputs (buf, merge_file);
2169     }
2170     line2 = 0;
2171     while (fgets (buf, sizeof (buf), f1) != NULL && line2 <= to2)
2172     {
2173         line2++;
2174         if (line2 >= from2)
2175             fputs (buf, merge_file);
2176     }
2177     while (fgets (buf, sizeof (buf), f0) != NULL)
2178     {
2179         line1++;
2180         if (line1 > to1)
2181             fputs (buf, merge_file);
2182     }
2183     fclose (f0);
2184     fclose (f1);
2185 }
2186
2187 static void
2188 do_merge_hunk (WDiff * dview)
2189 {
2190     int from1, to1, from2, to2;
2191     int res;
2192     int hunk;
2193
2194     hunk = get_current_hunk (dview, &from1, &to1, &from2, &to2);
2195     if (hunk > 0)
2196     {
2197         int merge_file_fd;
2198         FILE *merge_file;
2199         char *merge_file_name = NULL;
2200
2201         if (!dview->merged)
2202         {
2203             dview->merged = mc_util_make_backup_if_possible (dview->file[0], "~~~");
2204             if (!dview->merged)
2205             {
2206                 message (D_ERROR, MSG_ERROR,
2207                          _("Cannot create backup file\n%s%s\n%s"),
2208                          dview->file[0], "~~~", unix_error_string (errno));
2209                 return;
2210             }
2211
2212         }
2213
2214         merge_file_fd = mc_mkstemps (&merge_file_name, "mcmerge", NULL);
2215         if (merge_file_fd == -1)
2216         {
2217             message (D_ERROR, MSG_ERROR, _("Cannot create temporary merge file\n%s"),
2218                      unix_error_string (errno));
2219             return;
2220         }
2221
2222         merge_file = fdopen (merge_file_fd, "w");
2223
2224         switch (hunk)
2225         {
2226         case DIFF_DEL:
2227             dview_remove_hunk (dview, merge_file, from1, to1);
2228             break;
2229         case DIFF_ADD:
2230             dview_add_hunk (dview, merge_file, from1, from2, to2);
2231             break;
2232         case DIFF_CHG:
2233             dview_replace_hunk (dview, merge_file, from1, to1, from2, to2);
2234             break;
2235         }
2236         fflush (merge_file);
2237         fclose (merge_file);
2238         res = rewrite_backup_content (merge_file_name, dview->file[0]);
2239         unlink (merge_file_name);
2240         g_free (merge_file_name);
2241     }
2242 }
2243
2244 /* --------------------------------------------------------------------------------------------- */
2245 /* view routines and callbacks ********************************************** */
2246
2247 static void
2248 dview_compute_split (WDiff * dview, int i)
2249 {
2250     dview->bias += i;
2251     if (dview->bias < 2 - dview->half1)
2252     {
2253         dview->bias = 2 - dview->half1;
2254     }
2255     if (dview->bias > dview->half2 - 2)
2256     {
2257         dview->bias = dview->half2 - 2;
2258     }
2259 }
2260
2261 /* --------------------------------------------------------------------------------------------- */
2262
2263 static void
2264 dview_compute_areas (WDiff * dview)
2265 {
2266     dview->height = LINES - 2;
2267     dview->half1 = COLS / 2;
2268     dview->half2 = COLS - dview->half1;
2269
2270     dview_compute_split (dview, 0);
2271 }
2272
2273 /* --------------------------------------------------------------------------------------------- */
2274
2275 static int
2276 dview_init (WDiff * dview, const char *args, const char *file1, const char *file2,
2277             const char *label1, const char *label2, DSRC dsrc)
2278 {
2279     int ndiff;
2280     FBUF *f[2];
2281
2282     f[0] = NULL;
2283     f[1] = NULL;
2284
2285     if (dsrc == DATA_SRC_TMP)
2286     {
2287         f[0] = f_temp ();
2288         if (f[0] == NULL)
2289             return -1;
2290
2291         f[1] = f_temp ();
2292         if (f[1] == NULL)
2293         {
2294             f_close (f[0]);
2295             return -1;
2296         }
2297     }
2298     else if (dsrc == DATA_SRC_ORG)
2299     {
2300         f[0] = f_open (file1, O_RDONLY);
2301         if (f[0] == NULL)
2302             return -1;
2303
2304         f[1] = f_open (file2, O_RDONLY);
2305         if (f[1] == NULL)
2306         {
2307             f_close (f[0]);
2308             return -1;
2309         }
2310     }
2311
2312     dview->args = args;
2313     dview->file[0] = file1;
2314     dview->file[1] = file2;
2315     dview->label[0] = g_strdup (label1);
2316     dview->label[1] = g_strdup (label2);
2317     dview->f[0] = f[0];
2318     dview->f[1] = f[1];
2319     dview->hdiff = NULL;
2320     dview->dsrc = dsrc;
2321     dview->converter = str_cnv_from_term;
2322     dview_set_codeset (dview);
2323
2324     dview->a[0] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
2325     dview->a[1] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
2326
2327     ndiff = redo_diff (dview);
2328     if (ndiff < 0)
2329     {
2330         /* goto WIDGET_DESTROY stage: dview_fini() */
2331         return -1;
2332     }
2333
2334     dview->ndiff = ndiff;
2335
2336     dview->view_quit = 0;
2337
2338     dview->bias = 0;
2339     dview->new_frame = 1;
2340     dview->skip_rows = 0;
2341     dview->skip_cols = 0;
2342     dview->display_symbols = 0;
2343     dview->display_numbers = 0;
2344     dview->show_cr = 1;
2345     dview->tab_size = 8;
2346     dview->ord = 0;
2347     dview->full = 0;
2348
2349     dview->search.handle = NULL;
2350     dview->search.last_string = NULL;
2351     dview->search.last_found_line = -1;
2352     dview->search.last_accessed_num_line = 0;
2353
2354     dview->opt.quality = 0;
2355     dview->opt.strip_trailing_cr = 0;
2356     dview->opt.ignore_tab_expansion = 0;
2357     dview->opt.ignore_space_change = 0;
2358     dview->opt.ignore_all_space = 0;
2359     dview->opt.ignore_case = 0;
2360
2361     dview_compute_areas (dview);
2362
2363     return 0;
2364 }
2365
2366 /* --------------------------------------------------------------------------------------------- */
2367
2368 static void
2369 dview_reread (WDiff * dview)
2370 {
2371     int ndiff = dview->ndiff;
2372     destroy_hdiff (dview);
2373
2374     g_array_foreach (dview->a[0], DIFFLN, cc_free_elt);
2375     g_array_free (dview->a[0], TRUE);
2376     g_array_foreach (dview->a[1], DIFFLN, cc_free_elt);
2377     g_array_free (dview->a[1], TRUE);
2378
2379     dview->a[0] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
2380     dview->a[1] = g_array_new (FALSE, FALSE, sizeof (DIFFLN));
2381
2382     ndiff = redo_diff (dview);
2383     if (ndiff >= 0)
2384     {
2385         dview->ndiff = ndiff;
2386     }
2387 }
2388
2389 /* --------------------------------------------------------------------------------------------- */
2390 static void
2391 dview_diff_options (WDiff * dview)
2392 {
2393     const char *quality_str[] = {
2394         N_("&Normal"),
2395         N_("&Fastest (Assume large files)"),
2396         N_("&Minimal (Find a smaller set of change)")
2397     };
2398
2399     QuickWidget diffopt_widgets[] = {
2400         QUICK_BUTTON (6, 10, 14, OPTY, N_("&Cancel"), B_CANCEL, NULL),
2401         QUICK_BUTTON (2, 10, 14, OPTY, N_("&OK"), B_ENTER, NULL),
2402
2403         QUICK_CHECKBOX (3, OPTX, 12, OPTY,
2404                         N_("Strip &trailing carriage return"), &dview->opt.strip_trailing_cr),
2405         QUICK_CHECKBOX (3, OPTX, 11, OPTY,
2406                         N_("Ignore all &whitespace"), &dview->opt.ignore_all_space),
2407         QUICK_CHECKBOX (3, OPTX, 10, OPTY,
2408                         N_("Ignore &space change"), &dview->opt.ignore_space_change),
2409         QUICK_CHECKBOX (3, OPTX, 9, OPTY,
2410                         N_("Ignore tab &expansion"), &dview->opt.ignore_tab_expansion),
2411         QUICK_CHECKBOX (3, OPTX, 8, OPTY,
2412                         N_("&Ignore case"), &dview->opt.ignore_case),
2413         QUICK_LABEL (3, OPTX, 7, OPTY, N_("Diff extra options")),
2414         QUICK_RADIO (3, OPTX, 3, OPTY,
2415                      3, (const char **) quality_str, (int *) &dview->opt.quality),
2416         QUICK_LABEL (3, OPTX, 2, OPTY, N_("Diff algorithm")),
2417
2418         QUICK_END
2419     };
2420
2421     QuickDialog diffopt = {
2422         OPTX, OPTY, -1, -1,
2423         N_("Diff Options"), "[Diff Options]",
2424         diffopt_widgets, 0
2425     };
2426
2427     if (quick_dialog (&diffopt) != B_CANCEL)
2428     {
2429         dview_reread (dview);
2430     }
2431 }
2432
2433 /* --------------------------------------------------------------------------------------------- */
2434
2435 static void
2436 dview_fini (WDiff * dview)
2437 {
2438     if (dview->dsrc != DATA_SRC_MEM)
2439     {
2440         f_close (dview->f[1]);
2441         f_close (dview->f[0]);
2442     }
2443
2444     if (dview->converter != str_cnv_from_term)
2445         str_close_conv (dview->converter);
2446
2447     destroy_hdiff (dview);
2448     g_array_foreach (dview->a[0], DIFFLN, cc_free_elt);
2449     g_array_free (dview->a[0], TRUE);
2450     g_array_foreach (dview->a[1], DIFFLN, cc_free_elt);
2451     g_array_free (dview->a[1], TRUE);
2452
2453     g_free (dview->label[0]);
2454     g_free (dview->label[1]);
2455
2456     dview->a[1] = NULL;
2457     dview->a[0] = NULL;
2458 }
2459
2460 /* --------------------------------------------------------------------------------------------- */
2461
2462 static int
2463 dview_display_file (const WDiff * dview, int ord, int r, int c, int height, int width)
2464 {
2465     size_t i, k;
2466     int j;
2467     char buf[BUFSIZ];
2468     FBUF *f = dview->f[ord];
2469     int skip = dview->skip_cols;
2470     int display_symbols = dview->display_symbols;
2471     int display_numbers = dview->display_numbers;
2472     int show_cr = dview->show_cr;
2473     int tab_size = 8;
2474     const DIFFLN *p;
2475     int nwidth = display_numbers;
2476     int xwidth = display_symbols + display_numbers;
2477     if (dview->tab_size > 0 && dview->tab_size < 9)
2478         tab_size = dview->tab_size;
2479
2480     if (xwidth)
2481     {
2482         if (xwidth > width && display_symbols)
2483         {
2484             xwidth--;
2485             display_symbols = 0;
2486         }
2487         if (xwidth > width && display_numbers)
2488         {
2489             xwidth = width;
2490             display_numbers = width;
2491         }
2492
2493         xwidth++;
2494
2495         c += xwidth;
2496         width -= xwidth;
2497
2498         if (width < 0)
2499         {
2500             width = 0;
2501         }
2502     }
2503
2504     if ((int) sizeof (buf) <= width || (int) sizeof (buf) <= nwidth)
2505     {
2506         /* abnormal, but avoid buffer overflow */
2507         return -1;
2508     }
2509
2510     for (i = dview->skip_rows, j = 0; i < dview->a[ord]->len && j < height; j++, i++)
2511     {
2512         int ch, next_ch, col;
2513         size_t cnt;
2514         p = (DIFFLN *) & g_array_index (dview->a[ord], DIFFLN, i);
2515         ch = p->ch;
2516         tty_setcolor (NORMAL_COLOR);
2517         if (display_symbols)
2518         {
2519             tty_gotoyx (r + j, c - 2);
2520             tty_print_char (ch);
2521         }
2522         if (p->line != 0)
2523         {
2524             if (display_numbers)
2525             {
2526                 tty_gotoyx (r + j, c - xwidth);
2527                 g_snprintf (buf, display_numbers + 1, "%*d", nwidth, p->line);
2528                 tty_print_string (str_fit_to_term (buf, nwidth, J_LEFT_FIT));
2529             }
2530             if (ch == ADD_CH)
2531             {
2532                 tty_setcolor (DFF_ADD_COLOR);
2533             }
2534             if (ch == CHG_CH)
2535             {
2536                 tty_setcolor (DFF_CHG_COLOR);
2537             }
2538             if (f == NULL)
2539             {
2540                 if (i == (size_t) dview->search.last_found_line)
2541                 {
2542                     tty_setcolor (MARKED_SELECTED_COLOR);
2543                 }
2544                 else
2545                 {
2546                     if (dview->hdiff != NULL && g_ptr_array_index (dview->hdiff, i) != NULL)
2547                     {
2548                         char att[BUFSIZ];
2549                         if (dview->utf8)
2550                             k = dview_str_utf8_offset_to_pos (p->p, width);
2551                         else
2552                             k = width;
2553                         cvt_mgeta (p->p, p->u.len, buf, k, skip, tab_size, show_cr,
2554                                    g_ptr_array_index (dview->hdiff, i), ord, att);
2555                         tty_gotoyx (r + j, c);
2556                         col = 0;
2557                         for (cnt = 0; cnt < strlen (buf) && col < width; cnt++)
2558                         {
2559                             int w;
2560                             gboolean ch_res;
2561                             if (dview->utf8)
2562                             {
2563                                 next_ch = dview_get_utf (buf + cnt, &w, &ch_res);
2564                                 if (w > 1)
2565                                     cnt += w - 1;
2566                                 if (!g_unichar_isprint (next_ch))
2567                                     next_ch = '.';
2568                             }
2569                             else
2570                                 next_ch = dview_get_byte (buf + cnt, &ch_res);
2571                             if (ch_res)
2572                             {
2573                                 tty_setcolor (att[cnt] ? DFF_CHH_COLOR : DFF_CHG_COLOR);
2574 #ifdef HAVE_CHARSET
2575                                 if (utf8_display)
2576                                 {
2577                                     if (!dview->utf8)
2578                                     {
2579                                         next_ch =
2580                                             convert_from_8bit_to_utf_c ((unsigned char) next_ch,
2581                                                                         dview->converter);
2582                                     }
2583                                 }
2584                                 else if (dview->utf8)
2585                                     next_ch =
2586                                         convert_from_utf_to_current_c (next_ch, dview->converter);
2587                                 else
2588 #endif
2589                                     next_ch = convert_to_display_c (next_ch);
2590
2591                                 tty_print_anychar (next_ch);
2592                                 col++;
2593                             }
2594                         }
2595                         continue;
2596                     }
2597                     else if (ch == CHG_CH)
2598                     {
2599                         tty_setcolor (DFF_CHH_COLOR);
2600                     }
2601                 }
2602                 if (dview->utf8)
2603                     k = dview_str_utf8_offset_to_pos (p->p, width);
2604                 else
2605                     k = width;
2606                 cvt_mget (p->p, p->u.len, buf, k, skip, tab_size, show_cr);
2607             }
2608             else
2609             {
2610                 cvt_fget (f, p->u.off, buf, width, skip, tab_size, show_cr);
2611             }
2612         }
2613         else
2614         {
2615             if (display_numbers)
2616             {
2617                 tty_gotoyx (r + j, c - xwidth);
2618                 memset (buf, ' ', display_numbers);
2619                 buf[display_numbers] = '\0';
2620                 tty_print_string (buf);
2621             }
2622             if (ch == DEL_CH)
2623             {
2624                 tty_setcolor (DFF_DEL_COLOR);
2625             }
2626             if (ch == CHG_CH)
2627             {
2628                 tty_setcolor (DFF_CHD_COLOR);
2629             }
2630             memset (buf, ' ', width);
2631             buf[width] = '\0';
2632         }
2633         tty_gotoyx (r + j, c);
2634         /* tty_print_nstring (buf, width); */
2635         col = 0;
2636         for (cnt = 0; cnt < strlen (buf) && col < width; cnt++)
2637         {
2638             int w;
2639             gboolean ch_res;
2640             if (dview->utf8)
2641             {
2642                 next_ch = dview_get_utf (buf + cnt, &w, &ch_res);
2643                 if (w > 1)
2644                     cnt += w - 1;
2645                 if (!g_unichar_isprint (next_ch))
2646                     next_ch = '.';
2647             }
2648             else
2649                 next_ch = dview_get_byte (buf + cnt, &ch_res);
2650             if (ch_res)
2651             {
2652 #ifdef HAVE_CHARSET
2653                 if (utf8_display)
2654                 {
2655                     if (!dview->utf8)
2656                     {
2657                         next_ch =
2658                             convert_from_8bit_to_utf_c ((unsigned char) next_ch, dview->converter);
2659                     }
2660                 }
2661                 else if (dview->utf8)
2662                     next_ch = convert_from_utf_to_current_c (next_ch, dview->converter);
2663                 else
2664 #endif
2665                     next_ch = convert_to_display_c (next_ch);
2666
2667                 tty_print_anychar (next_ch);
2668                 col++;
2669             }
2670         }
2671         continue;
2672     }
2673     tty_setcolor (NORMAL_COLOR);
2674     k = width;
2675     if (width < xwidth - 1)
2676     {
2677         k = xwidth - 1;
2678     }
2679     memset (buf, ' ', k);
2680     buf[k] = '\0';
2681     for (; j < height; j++)
2682     {
2683         if (xwidth)
2684         {
2685             tty_gotoyx (r + j, c - xwidth);
2686             /* tty_print_nstring (buf, xwidth - 1); */
2687             tty_print_string (str_fit_to_term (buf, xwidth - 1, J_LEFT_FIT));
2688         }
2689         tty_gotoyx (r + j, c);
2690         /* tty_print_nstring (buf, width); */
2691         tty_print_string (str_fit_to_term (buf, width, J_LEFT_FIT));
2692     }
2693
2694     return 0;
2695 }
2696
2697 /* --------------------------------------------------------------------------------------------- */
2698
2699 static void
2700 dview_status (const WDiff * dview, int ord, int width, int c)
2701 {
2702     int skip_rows = dview->skip_rows;
2703     int skip_cols = dview->skip_cols;
2704
2705     char buf[BUFSIZ];
2706     int filename_width;
2707     int linenum, lineofs;
2708
2709     tty_setcolor (SELECTED_COLOR);
2710
2711     tty_gotoyx (0, c);
2712     get_line_numbers (dview->a[ord], skip_rows, &linenum, &lineofs);
2713
2714     filename_width = width - 22;
2715     if (filename_width < 8)
2716     {
2717         filename_width = 8;
2718     }
2719     if (filename_width >= (int) sizeof (buf))
2720     {
2721         /* abnormal, but avoid buffer overflow */
2722         filename_width = sizeof (buf) - 1;
2723     }
2724     trim (strip_home_and_password (dview->label[ord]), buf, filename_width);
2725     if (ord == 0)
2726     {
2727         tty_printf ("%-*s %6d+%-4d Col %-4d ", filename_width, buf, linenum, lineofs, skip_cols);
2728     }
2729     else
2730     {
2731         tty_printf ("%-*s %6d+%-4d Dif %-4d ", filename_width, buf, linenum, lineofs, dview->ndiff);
2732     }
2733 }
2734
2735 /* --------------------------------------------------------------------------------------------- */
2736
2737 static void
2738 dview_redo (WDiff * dview)
2739 {
2740     if (dview->display_numbers)
2741     {
2742         int old = dview->display_numbers;
2743         dview->display_numbers = calc_nwidth ((const GArray **) dview->a);
2744         dview->new_frame = (old != dview->display_numbers);
2745     }
2746     dview_reread (dview);
2747 }
2748
2749 /* --------------------------------------------------------------------------------------------- */
2750
2751 static void
2752 dview_edit (WDiff * dview, int ord)
2753 {
2754     Dlg_head *h;
2755     gboolean h_modal;
2756     int linenum, lineofs;
2757
2758     if (dview->dsrc == DATA_SRC_TMP)
2759     {
2760         error_dialog (_("Edit"), _("Edit is disabled"));
2761         return;
2762     }
2763
2764     h = ((Widget *) dview)->owner;
2765     h_modal = h->modal;
2766
2767     get_line_numbers (dview->a[ord], dview->skip_rows, &linenum, &lineofs);
2768     h->modal = TRUE; /* not allow edit file in several editors */
2769     do_edit_at_line (dview->file[ord], linenum);
2770     h->modal = h_modal;
2771     dview_redo (dview);
2772     dview_update (dview);
2773 }
2774
2775 /* --------------------------------------------------------------------------------------------- */
2776
2777 static void
2778 dview_goto_cmd (WDiff * dview, int ord)
2779 {
2780     static const char *title[2] = { N_("Goto line (left)"), N_("Goto line (right)") };
2781     static char prev[256];
2782     /* XXX some statics here, to be remembered between runs */
2783
2784     int newline;
2785     char *input;
2786
2787     input = input_dialog (_(title[ord]), _("Enter line:"), MC_HISTORY_YDIFF_GOTO_LINE, prev);
2788     if (input != NULL)
2789     {
2790         const char *s = input;
2791         if (scan_deci (&s, &newline) == 0 && *s == '\0')
2792         {
2793             size_t i = 0;
2794             if (newline > 0)
2795             {
2796                 const DIFFLN *p;
2797                 for (; i < dview->a[ord]->len; i++)
2798                 {
2799                     p = &g_array_index (dview->a[ord], DIFFLN, i);
2800                     if (p->line == newline)
2801                     {
2802                         break;
2803                     }
2804                 }
2805             }
2806             dview->skip_rows = dview->search.last_accessed_num_line = i;
2807             g_snprintf (prev, sizeof (prev), "%d", newline);
2808         }
2809         g_free (input);
2810     }
2811 }
2812
2813 /* --------------------------------------------------------------------------------------------- */
2814
2815 static void
2816 dview_labels (WDiff * dview)
2817 {
2818     Dlg_head *h = dview->widget.owner;
2819     WButtonBar *b = find_buttonbar (h);
2820
2821     buttonbar_set_label (b, 1, Q_ ("ButtonBar|Help"), diff_map, (Widget *) dview);
2822     buttonbar_set_label (b, 2, Q_ ("ButtonBar|Save"), diff_map, (Widget *) dview);
2823     buttonbar_set_label (b, 4, Q_ ("ButtonBar|Edit"), diff_map, (Widget *) dview);
2824     buttonbar_set_label (b, 5, Q_ ("ButtonBar|Merge"), diff_map, (Widget *) dview);
2825     buttonbar_set_label (b, 7, Q_ ("ButtonBar|Search"), diff_map, (Widget *) dview);
2826     buttonbar_set_label (b, 9, Q_ ("ButtonBar|Options"), diff_map, (Widget *) dview);
2827     buttonbar_set_label (b, 10, Q_ ("ButtonBar|Quit"), diff_map, (Widget *) dview);
2828 }
2829
2830
2831 /* --------------------------------------------------------------------------------------------- */
2832
2833 static int
2834 dview_event (Gpm_Event * event, void *x)
2835 {
2836     WDiff *dview = (WDiff *) x;
2837     int result = MOU_NORMAL;
2838
2839     /* We are not interested in the release events */
2840     if ((event->type & (GPM_DOWN | GPM_DRAG)) == 0)
2841     {
2842         return result;
2843     }
2844
2845     /* Wheel events */
2846     if ((event->buttons & GPM_B_UP) != 0 && (event->type & GPM_DOWN) != 0)
2847     {
2848         dview->skip_rows -= 2;
2849         dview->search.last_accessed_num_line = dview->skip_rows;
2850         dview_update (dview);
2851     }
2852     else if ((event->buttons & GPM_B_DOWN) != 0 && (event->type & GPM_DOWN) != 0)
2853     {
2854         dview->skip_rows += 2;
2855         dview->search.last_accessed_num_line = dview->skip_rows;
2856         dview_update (dview);
2857     }
2858
2859     return result;
2860 }
2861
2862 static gboolean
2863 dview_save (WDiff * dview)
2864 {
2865     gboolean res = TRUE;
2866     if (!dview->merged)
2867         return res;
2868     res = mc_util_unlink_backup_if_possible (dview->file[0], "~~~");
2869     dview->merged = !res;
2870     return res;
2871 }
2872
2873 static void
2874 dview_do_save (WDiff * dview)
2875 {
2876     (void) dview_save (dview);
2877 }
2878
2879 static void
2880 dview_save_options (WDiff * dview)
2881 {
2882     mc_config_set_bool (mc_main_config, "DiffView", "show_symbols",
2883                         dview->display_symbols != 0 ? TRUE : FALSE);
2884     mc_config_set_bool (mc_main_config, "DiffView", "show_numbers",
2885                         dview->display_numbers != 0 ? TRUE : FALSE);
2886     mc_config_set_int (mc_main_config, "DiffView", "tab_size", dview->tab_size);
2887
2888     mc_config_set_int (mc_main_config, "DiffView", "diff_quality", dview->opt.quality);
2889
2890     mc_config_set_bool (mc_main_config, "DiffView", "diff_ignore_tws",
2891                         dview->opt.strip_trailing_cr);
2892     mc_config_set_bool (mc_main_config, "DiffView", "diff_ignore_all_space",
2893                         dview->opt.ignore_all_space);
2894     mc_config_set_bool (mc_main_config, "DiffView", "diff_ignore_space_change",
2895                         dview->opt.ignore_space_change);
2896     mc_config_set_bool (mc_main_config, "DiffView", "diff_tab_expansion",
2897                         dview->opt.ignore_tab_expansion);
2898     mc_config_set_bool (mc_main_config, "DiffView", "diff_ignore_case", dview->opt.ignore_case);
2899 }
2900
2901 static void
2902 dview_load_options (WDiff * dview)
2903 {
2904     gboolean show_numbers, show_symbols;
2905     int tab_size;
2906
2907     show_symbols = mc_config_get_bool (mc_main_config, "DiffView", "show_symbols", FALSE);
2908     if (show_symbols)
2909         dview->display_symbols = 1;
2910     show_numbers = mc_config_get_bool (mc_main_config, "DiffView", "show_numbers", FALSE);
2911     if (show_numbers)
2912         dview->display_numbers = calc_nwidth ((const GArray ** const) dview->a);
2913     tab_size = mc_config_get_int (mc_main_config, "DiffView", "tab_size", 8);
2914     if (tab_size > 0 && tab_size < 9)
2915         dview->tab_size = tab_size;
2916     else
2917         dview->tab_size = 8;
2918
2919     dview->opt.quality = mc_config_get_int (mc_main_config, "DiffView", "diff_quality", 0);
2920
2921     dview->opt.strip_trailing_cr =
2922         mc_config_get_bool (mc_main_config, "DiffView", "diff_ignore_tws", FALSE);
2923     dview->opt.ignore_all_space =
2924         mc_config_get_bool (mc_main_config, "DiffView", "diff_ignore_all_space", FALSE);
2925     dview->opt.ignore_space_change =
2926         mc_config_get_bool (mc_main_config, "DiffView", "diff_ignore_space_change", FALSE);
2927     dview->opt.ignore_tab_expansion =
2928         mc_config_get_bool (mc_main_config, "DiffView", "diff_tab_expansion", FALSE);
2929     dview->opt.ignore_case =
2930         mc_config_get_bool (mc_main_config, "DiffView", "diff_ignore_case", FALSE);
2931
2932     dview->new_frame = 1;
2933 }
2934
2935 /*
2936  * Check if it's OK to close the diff viewer.  If there are unsaved changes,
2937  * ask user.
2938  */
2939 static gboolean
2940 dview_ok_to_exit (WDiff * dview)
2941 {
2942     gboolean res = TRUE;
2943     if (!dview->merged)
2944         return res;
2945     switch (query_dialog
2946             (_("Quit"), _("File was modified, Save with exit?"), D_NORMAL, 2, _("&Yes"),
2947              _("&No")))
2948     {
2949     case -1:
2950         res = FALSE;
2951         break;
2952     case 0:
2953         res = TRUE;
2954         (void) dview_save (dview);
2955         break;
2956     case 1:
2957         res = TRUE;
2958         if (mc_util_restore_from_backup_if_possible (dview->file[0], "~~~"))
2959             res = mc_util_unlink_backup_if_possible (dview->file[0], "~~~");
2960         break;
2961     }
2962     return res;
2963 }
2964
2965 /* --------------------------------------------------------------------------------------------- */
2966
2967 static cb_ret_t
2968 dview_execute_cmd (WDiff * dview, unsigned long command)
2969 {
2970     cb_ret_t res = MSG_HANDLED;
2971     switch (command)
2972     {
2973     case CK_DiffHelp:
2974         interactive_display (NULL, "[Diff Viewer]");
2975         break;
2976     case CK_DiffDisplaySymbols:
2977         dview->display_symbols ^= 1;
2978         dview->new_frame = 1;
2979         break;
2980     case CK_DiffDisplayNumbers:
2981         dview->display_numbers ^= calc_nwidth ((const GArray ** const) dview->a);
2982         dview->new_frame = 1;
2983         break;
2984     case CK_DiffFull:
2985         dview->full ^= 1;
2986         dview->new_frame = 1;
2987         break;
2988     case CK_DiffEqual:
2989         if (!dview->full)
2990         {
2991             dview->bias = 0;
2992             dview->new_frame = 1;
2993         }
2994         break;
2995     case CK_DiffSplitMore:
2996         if (!dview->full)
2997         {
2998             dview_compute_split (dview, 1);
2999             dview->new_frame = 1;
3000         }
3001         break;
3002
3003     case CK_DiffSplitLess:
3004         if (!dview->full)
3005         {
3006             dview_compute_split (dview, -1);
3007             dview->new_frame = 1;
3008         }
3009         break;
3010     case CK_DiffSetTab2:
3011         dview->tab_size = 2;
3012         break;
3013     case CK_DiffSetTab3:
3014         dview->tab_size = 3;
3015         break;
3016     case CK_DiffSetTab4:
3017         dview->tab_size = 4;
3018         break;
3019     case CK_DiffSetTab8:
3020         dview->tab_size = 8;
3021         break;
3022     case CK_DiffSwapPanel:
3023         dview->ord ^= 1;
3024         break;
3025     case CK_DiffRedo:
3026         dview_redo (dview);
3027         break;
3028     case CK_DiffNextHunk:
3029         dview->skip_rows = dview->search.last_accessed_num_line =
3030             find_next_hunk (dview->a[0], dview->skip_rows);
3031         break;
3032     case CK_DiffPrevHunk:
3033         dview->skip_rows = dview->search.last_accessed_num_line =
3034             find_prev_hunk (dview->a[0], dview->skip_rows);
3035         break;
3036     case CK_DiffGoto:
3037         dview_goto_cmd (dview, TRUE);
3038         break;
3039     case CK_DiffEditCurrent:
3040         dview_edit (dview, dview->ord);
3041         break;
3042     case CK_DiffMergeCurrentHunk:
3043         do_merge_hunk (dview);
3044         dview_redo (dview);
3045         break;
3046     case CK_DiffEditOther:
3047         dview_edit (dview, dview->ord ^ 1);
3048         break;
3049     case CK_DiffSearch:
3050         dview_search_cmd (dview);
3051         break;
3052     case CK_DiffContinueSearch:
3053         dview_continue_search_cmd (dview);
3054         break;
3055     case CK_DiffBOF:
3056         dview->skip_rows = dview->search.last_accessed_num_line = 0;
3057         break;
3058     case CK_DiffEOF:
3059         dview->skip_rows = dview->search.last_accessed_num_line = dview->a[0]->len - 1;
3060         break;
3061     case CK_DiffUp:
3062         dview->skip_rows--;
3063         dview->search.last_accessed_num_line = dview->skip_rows;
3064         break;
3065     case CK_DiffDown:
3066         dview->skip_rows++;
3067         dview->search.last_accessed_num_line = dview->skip_rows;
3068         break;
3069     case CK_DiffPageDown:
3070         dview->skip_rows += dview->height - 2;
3071         dview->search.last_accessed_num_line = dview->skip_rows;
3072         break;
3073     case CK_DiffPageUp:
3074         dview->skip_rows -= dview->height - 2;
3075         dview->search.last_accessed_num_line = dview->skip_rows;
3076         break;
3077     case CK_DiffLeft:
3078         dview->skip_cols--;
3079         break;
3080     case CK_DiffRight:
3081         dview->skip_cols++;
3082         break;
3083     case CK_DiffQuickLeft:
3084         dview->skip_cols -= 8;
3085         break;
3086     case CK_DiffQuickRight:
3087         dview->skip_cols += 8;
3088         break;
3089     case CK_DiffHome:
3090         dview->skip_cols = 0;
3091         break;
3092     case CK_ShowCommandLine:
3093         view_other_cmd ();
3094         break;
3095     case CK_DiffQuit:
3096         dview->view_quit = 1;
3097         break;
3098     case CK_DiffSave:
3099         dview_do_save (dview);
3100         break;
3101     case CK_DiffOptions:
3102         dview_diff_options (dview);
3103         break;
3104     case CK_SelectCodepage:
3105         dview_select_encoding (dview);
3106         dview_reread (dview);
3107         tty_touch_screen ();
3108         repaint_screen ();
3109         break;
3110     default:
3111         res = MSG_NOT_HANDLED;
3112     }
3113     return res;
3114 }
3115
3116 /* --------------------------------------------------------------------------------------------- */
3117
3118 static cb_ret_t
3119 dview_handle_key (WDiff * dview, int key)
3120 {
3121     unsigned long command;
3122
3123     key = convert_from_input_c (key);
3124
3125     command = lookup_keymap_command (diff_map, key);
3126     if ((command != CK_Ignore_Key) && (dview_execute_cmd (dview, command) == MSG_HANDLED))
3127         return MSG_HANDLED;
3128
3129     /* Key not used */
3130     return MSG_NOT_HANDLED;
3131 }
3132
3133 /* --------------------------------------------------------------------------------------------- */
3134
3135 static cb_ret_t
3136 dview_callback (Widget * w, widget_msg_t msg, int parm)
3137 {
3138     WDiff *dview = (WDiff *) w;
3139     Dlg_head *h = dview->widget.owner;
3140     cb_ret_t i;
3141
3142     switch (msg)
3143     {
3144     case WIDGET_INIT:
3145         dview_labels (dview);
3146         dview_load_options (dview);
3147         dview_update (dview);
3148         return MSG_HANDLED;
3149
3150     case WIDGET_DRAW:
3151         dview->new_frame = 1;
3152         dview_update (dview);
3153         return MSG_HANDLED;
3154
3155     case WIDGET_KEY:
3156         i = dview_handle_key (dview, parm);
3157         if (dview->view_quit)
3158             dlg_stop (h);
3159         else
3160             dview_update (dview);
3161         return i;
3162
3163     case WIDGET_COMMAND:
3164         i = dview_execute_cmd (dview, parm);
3165         if (dview->view_quit)
3166             dlg_stop (h);
3167         else
3168             dview_update (dview);
3169         return i;
3170
3171     case WIDGET_DESTROY:
3172         dview_save_options (dview);
3173         dview_fini (dview);
3174         return MSG_HANDLED;
3175
3176     default:
3177         return default_proc (msg, parm);
3178     }
3179 }
3180
3181 /* --------------------------------------------------------------------------------------------- */
3182
3183 static void
3184 dview_adjust_size (Dlg_head * h)
3185 {
3186     WDiff *dview;
3187     WButtonBar *bar;
3188
3189     /* Look up the viewer and the buttonbar, we assume only two widgets here */
3190     dview = (WDiff *) find_widget_type (h, dview_callback);
3191     bar = find_buttonbar (h);
3192     widget_set_size (&dview->widget, 0, 0, LINES - 1, COLS);
3193     widget_set_size ((Widget *) bar, LINES - 1, 0, 1, COLS);
3194
3195     dview_compute_areas (dview);
3196 }
3197
3198 /* --------------------------------------------------------------------------------------------- */
3199
3200 static cb_ret_t
3201 dview_dialog_callback (Dlg_head * h, Widget * sender, dlg_msg_t msg, int parm, void *data)
3202 {
3203     WDiff *dview = (WDiff *) data;
3204
3205     switch (msg)
3206     {
3207     case DLG_RESIZE:
3208         dview_adjust_size (h);
3209         return MSG_HANDLED;
3210
3211     case DLG_ACTION:
3212         /* command from buttonbar */
3213         return send_message ((Widget *) dview, WIDGET_COMMAND, parm);
3214
3215     case DLG_VALIDATE:
3216         dview = (WDiff *) find_widget_type (h, dview_callback);
3217         if (!dview_ok_to_exit (dview))
3218             h->state = DLG_ACTIVE;
3219         else
3220             h->state = DLG_CLOSED;
3221
3222         return MSG_HANDLED;
3223
3224     default:
3225         return default_dlg_callback (h, sender, msg, parm, data);
3226     }
3227 }
3228
3229 /* --------------------------------------------------------------------------------------------- */
3230
3231 static char *
3232 dview_get_title (const Dlg_head *h, size_t len)
3233 {
3234     const WDiff *dview = (const WDiff *) find_widget_type (h, dview_callback);
3235     const char *modified = dview->merged ? " (*) " : "     ";
3236     size_t len1;
3237
3238     len -=  (size_t) str_term_width1 (_("Diff:")) + strlen (modified);
3239     len1 = (len - 3)/2;
3240
3241     return g_strconcat (_("Diff:"), modified,
3242                         str_term_trim (dview->label[0], len1), " | ",
3243                         str_term_trim (dview->label[1], len - len1), (char *) NULL);
3244 }
3245
3246 /*** public functions ****************************************************************************/
3247 /* --------------------------------------------------------------------------------------------- */
3248
3249 int
3250 diff_view (const char *file1, const char *file2, const char *label1, const char *label2)
3251 {
3252     int error;
3253     WDiff *dview;
3254     Dlg_head *dview_dlg;
3255
3256     /* Create dialog and widgets, put them on the dialog */
3257     dview_dlg =
3258         create_dlg (FALSE, 0, 0, LINES, COLS, NULL, dview_dialog_callback,
3259                     "[Diff Viewer]", NULL, DLG_WANT_TAB);
3260
3261     dview = g_new0 (WDiff, 1);
3262
3263     init_widget (&dview->widget, 0, 0, LINES - 1, COLS,
3264                  (callback_fn) dview_callback, (mouse_h) dview_event);
3265
3266     widget_want_cursor (dview->widget, 0);
3267
3268     add_widget (dview_dlg, dview);
3269     add_widget (dview_dlg, buttonbar_new (TRUE));
3270
3271     dview_dlg->get_title = dview_get_title;
3272
3273     error = dview_init (dview, "-a", file1, file2, label1, label2, DATA_SRC_MEM);       /* XXX binary diff? */
3274
3275     /* Please note that if you add another widget,
3276      * you have to modify dview_adjust_size to
3277      * be aware of it
3278      */
3279     if (error == 0)
3280         run_dlg (dview_dlg);
3281
3282     if ((error != 0) || (dview_dlg->state == DLG_CLOSED))
3283         destroy_dlg (dview_dlg);
3284
3285     return error;
3286 }
3287
3288 /* --------------------------------------------------------------------------------------------- */
3289
3290 #define GET_FILE_AND_STAMP(n)                                   \
3291     do {                                                        \
3292         use_copy##n = 0;                                        \
3293         real_file##n = file##n;                                 \
3294         if (!vfs_file_is_local(file##n)) {                      \
3295             real_file##n = mc_getlocalcopy(file##n);            \
3296             if (real_file##n != NULL) {                         \
3297                 use_copy##n = 1;                                \
3298                 if (mc_stat(real_file##n, &st##n) != 0) {       \
3299                     use_copy##n = -1;                           \
3300                 }                                               \
3301             }                                                   \
3302         }                                                       \
3303     } while (0)
3304 #define UNGET_FILE(n)                                           \
3305     do {                                                        \
3306         if (use_copy##n) {                                      \
3307             int changed = 0;                                    \
3308             if (use_copy##n > 0) {                              \
3309                 time_t mtime = st##n.st_mtime;                  \
3310                 if (mc_stat(real_file##n, &st##n) == 0) {       \
3311                     changed = (mtime != st##n.st_mtime);        \
3312                 }                                               \
3313             }                                                   \
3314             mc_ungetlocalcopy(file##n, real_file##n, changed);  \
3315             g_free(real_file##n);                               \
3316         }                                                       \
3317     } while (0)
3318
3319 void
3320 dview_diff_cmd (void)
3321 {
3322     int rv = 0;
3323     char *file0 = NULL;
3324     char *file1 = NULL;
3325     int is_dir0 = 0;
3326     int is_dir1 = 0;
3327
3328     if (mc_run_mode == MC_RUN_FULL)
3329     {
3330         const WPanel *panel0 = current_panel;
3331         const WPanel *panel1 = other_panel;
3332         if (get_current_index ())
3333         {
3334             panel0 = other_panel;
3335             panel1 = current_panel;
3336         }
3337         file0 = concat_dir_and_file (panel0->cwd, selection (panel0)->fname);
3338         file1 = concat_dir_and_file (panel1->cwd, selection (panel1)->fname);
3339         is_dir0 = S_ISDIR (selection (panel0)->st.st_mode);
3340         is_dir1 = S_ISDIR (selection (panel1)->st.st_mode);
3341     }
3342
3343     if (rv == 0)
3344     {
3345         rv = -1;
3346         if (file0 != NULL && !is_dir0 && file1 != NULL && !is_dir1)
3347         {
3348             int use_copy0;
3349             int use_copy1;
3350             struct stat st0;
3351             struct stat st1;
3352             char *real_file0;
3353             char *real_file1;
3354             GET_FILE_AND_STAMP (0);
3355             GET_FILE_AND_STAMP (1);
3356             if (real_file0 != NULL && real_file1 != NULL)
3357             {
3358                 rv = diff_view (real_file0, real_file1, file0, file1);
3359             }
3360             UNGET_FILE (1);
3361             UNGET_FILE (0);
3362         }
3363     }
3364
3365     g_free (file1);
3366     g_free (file0);
3367
3368     if (rv != 0)
3369         message (1, MSG_ERROR, _("Two files are needed to compare"));
3370 }
3371
3372 /* --------------------------------------------------------------------------------------------- */
3373
3374 void
3375 dview_update (WDiff * dview)
3376 {
3377     int height = dview->height;
3378     int width1;
3379     int width2;
3380
3381     int last = dview->a[0]->len - 1;
3382
3383     if (dview->skip_rows > last)
3384     {
3385         dview->skip_rows = dview->search.last_accessed_num_line = last;
3386     }
3387     if (dview->skip_rows < 0)
3388     {
3389         dview->skip_rows = dview->search.last_accessed_num_line = 0;
3390     }
3391     if (dview->skip_cols < 0)
3392     {
3393         dview->skip_cols = 0;
3394     }
3395
3396     if (height < 2)
3397     {
3398         return;
3399     }
3400
3401     width1 = dview->half1 + dview->bias;
3402     width2 = dview->half2 - dview->bias;
3403     if (dview->full)
3404     {
3405         width1 = COLS;
3406         width2 = 0;
3407     }
3408
3409     if (dview->new_frame)
3410     {
3411         int xwidth = dview->display_symbols + dview->display_numbers;
3412
3413         tty_setcolor (NORMAL_COLOR);
3414         if (width1 > 1)
3415         {
3416             tty_draw_box (1, 0, height, width1, FALSE);
3417         }
3418         if (width2 > 1)
3419         {
3420             tty_draw_box (1, width1, height, width2, FALSE);
3421         }
3422
3423         if (xwidth)
3424         {
3425             xwidth++;
3426             if (xwidth < width1 - 1)
3427             {
3428                 tty_gotoyx (1, xwidth);
3429                 tty_print_alt_char (mc_tty_frm[MC_TTY_FRM_DTOPMIDDLE], FALSE);
3430                 tty_gotoyx (height, xwidth);
3431                 tty_print_alt_char (mc_tty_frm[MC_TTY_FRM_DBOTTOMMIDDLE], FALSE);
3432                 tty_draw_vline (2, xwidth, mc_tty_frm[MC_TTY_FRM_VERT], height - 2);
3433             }
3434             if (xwidth < width2 - 1)
3435             {
3436                 tty_gotoyx (1, width1 + xwidth);
3437                 tty_print_alt_char (mc_tty_frm[MC_TTY_FRM_DTOPMIDDLE], FALSE);
3438                 tty_gotoyx (height, width1 + xwidth);
3439                 tty_print_alt_char (mc_tty_frm[MC_TTY_FRM_DBOTTOMMIDDLE], FALSE);
3440                 tty_draw_vline (2, width1 + xwidth, mc_tty_frm[MC_TTY_FRM_VERT], height - 2);
3441             }
3442         }
3443         dview->new_frame = 0;
3444     }
3445
3446     if (width1 > 2)
3447     {
3448         dview_status (dview, dview->ord, width1, 0);
3449         dview_display_file (dview, dview->ord, 2, 1, height - 2, width1 - 2);
3450     }
3451     if (width2 > 2)
3452     {
3453         dview_status (dview, dview->ord ^ 1, width2, width1);
3454         dview_display_file (dview, dview->ord ^ 1, 2, width1 + 1, height - 2, width2 - 2);
3455     }
3456 }
3457
3458 /* --------------------------------------------------------------------------------------------- */