lib/util.c

   1 /* Various utilities
   2    Copyright (C) 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003,
   3    2004, 2005, 2007, 2009 Free Software Foundation, Inc.
   4    Written 1994, 1995, 1996 by:
   5    Miguel de Icaza, Janne Kukonlehto, Dugan Porter,
   6    Jakub Jelinek, Mauricio Plaza.
   7
   8    The file_date routine is mostly from GNU's fileutils package,
   9    written by Richard Stallman and David MacKenzie.
  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 /** \file
  26  *  \brief Source: various utilities
  27  */
  28
  29 #include <config.h>
  30
  31 #include <ctype.h>
  32 #include <limits.h>
  33 #include <stdarg.h>
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <fcntl.h>
  38 #include <sys/time.h>
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <unistd.h>
  42
  43 #include "lib/global.h"
  44 #include "lib/tty/win.h"        /* xterm_flag */
  45 #include "lib/search.h"
  46 #include "lib/mcconfig.h"
  47 #include "lib/timefmt.h"
  48 #include "lib/fileloc.h"
  49 #include "lib/vfs/mc-vfs/vfs.h"
  50 #include "lib/strutil.h"
  51
  52 #include "src/filegui.h"
  53 #include "src/file.h"           /* copy_file_file() */
  54 #ifndef HAVE_CHARSET
  55 #include "src/main.h"           /* eight_bit_clean */
  56 #endif
  57
  58 int easy_patterns = 1;
  59
  60 /*
  61  * If true, SI units (1000 based) will be used for
  62  * larger units (kilobyte, megabyte, ...).
  63  * If false binary units (1024 based) will be used.
  64  */
  65 int kilobyte_si = 0;
  66
  67 char *user_recent_timeformat = NULL;    /* time format string for recent dates */
  68 char *user_old_timeformat = NULL;       /* time format string for older dates */
  69
  70 /*
  71  * Cache variable for the i18n_checktimelength function,
  72  * initially set to a clearly invalid value to show that
  73  * it hasn't been initialized yet.
  74  */
  75 static size_t i18n_timelength_cache = MAX_I18NTIMELENGTH + 1;
  76
  77 extern void
  78 str_replace (char *s, char from, char to)
  79 {
  80     for (; *s != '\0'; s++)
  81     {
  82         if (*s == from)
  83             *s = to;
  84     }
  85 }
  86
  87 static inline int
  88 is_7bit_printable (unsigned char c)
  89 {
  90     return (c > 31 && c < 127);
  91 }
  92
  93 static inline int
  94 is_iso_printable (unsigned char c)
  95 {
  96     return ((c > 31 && c < 127) || c >= 160);
  97 }
  98
  99 static inline int
 100 is_8bit_printable (unsigned char c)
 101 {
 102     /* "Full 8 bits output" doesn't work on xterm */
 103     if (xterm_flag)
 104         return is_iso_printable (c);
 105
 106     return (c > 31 && c != 127 && c != 155);
 107 }
 108
 109 int
 110 is_printable (int c)
 111 {
 112     c &= 0xff;
 113
 114 #ifdef HAVE_CHARSET
 115     /* "Display bits" is ignored, since the user controls the output
 116        by setting the output codepage */
 117     return is_8bit_printable (c);
 118 #else
 119     if (!eight_bit_clean)
 120         return is_7bit_printable (c);
 121
 122     if (full_eight_bits)
 123     {
 124         return is_8bit_printable (c);
 125     }
 126     else
 127         return is_iso_printable (c);
 128 #endif /* !HAVE_CHARSET */
 129 }
 130
 131 /* Calculates the message dimensions (lines and columns) */
 132 void
 133 msglen (const char *text, int *lines, int *columns)
 134 {
 135     int nlines = 1;             /* even the empty string takes one line */
 136     int ncolumns = 0;
 137     int colindex = 0;
 138
 139     for (; *text != '\0'; text++)
 140     {
 141         if (*text == '\n')
 142         {
 143             nlines++;
 144             colindex = 0;
 145         }
 146         else
 147         {
 148             colindex++;
 149             if (colindex > ncolumns)
 150                 ncolumns = colindex;
 151         }
 152     }
 153
 154     *lines = nlines;
 155     *columns = ncolumns;
 156 }
 157
 158 /*
 159  * Copy from s to d, and trim the beginning if necessary, and prepend
 160  * "..." in this case.  The destination string can have at most len
 161  * bytes, not counting trailing 0.
 162  */
 163 char *
 164 trim (const char *s, char *d, int len)
 165 {
 166     int source_len;
 167
 168     /* Sanity check */
 169     len = max (len, 0);
 170
 171     source_len = strlen (s);
 172     if (source_len > len)
 173     {
 174         /* Cannot fit the whole line */
 175         if (len <= 3)
 176         {
 177             /* We only have room for the dots */
 178             memset (d, '.', len);
 179             d[len] = 0;
 180             return d;
 181         }
 182         else
 183         {
 184             /* Begin with ... and add the rest of the source string */
 185             memset (d, '.', 3);
 186             strcpy (d + 3, s + 3 + source_len - len);
 187         }
 188     }
 189     else
 190         /* We can copy the whole line */
 191         strcpy (d, s);
 192     return d;
 193 }
 194
 195 /*
 196  * Quote the filename for the purpose of inserting it into the command
 197  * line.  If quote_percent is 1, replace "%" with "%%" - the percent is
 198  * processed by the mc command line.
 199  */
 200 char *
 201 name_quote (const char *s, int quote_percent)
 202 {
 203     char *ret, *d;
 204
 205     d = ret = g_malloc (strlen (s) * 2 + 2 + 1);
 206     if (*s == '-')
 207     {
 208         *d++ = '.';
 209         *d++ = '/';
 210     }
 211
 212     for (; *s; s++, d++)
 213     {
 214         switch (*s)
 215         {
 216         case '%':
 217             if (quote_percent)
 218                 *d++ = '%';
 219             break;
 220         case '\'':
 221         case '\\':
 222         case '\r':
 223         case '\n':
 224         case '\t':
 225         case '"':
 226         case ';':
 227         case ' ':
 228         case '?':
 229         case '|':
 230         case '[':
 231         case ']':
 232         case '{':
 233         case '}':
 234         case '<':
 235         case '>':
 236         case '`':
 237         case '!':
 238         case '$':
 239         case '&':
 240         case '*':
 241         case '(':
 242         case ')':
 243             *d++ = '\\';
 244             break;
 245         case '~':
 246         case '#':
 247             if (d == ret)
 248                 *d++ = '\\';
 249             break;
 250         }
 251         *d = *s;
 252     }
 253     *d = '\0';
 254     return ret;
 255 }
 256
 257 char *
 258 fake_name_quote (const char *s, int quote_percent)
 259 {
 260     (void) quote_percent;
 261     return g_strdup (s);
 262 }
 263
 264 /*
 265  * Remove the middle part of the string to fit given length.
 266  * Use "~" to show where the string was truncated.
 267  * Return static buffer, no need to free() it.
 268  */
 269 const char *
 270 name_trunc (const char *txt, size_t trunc_len)
 271 {
 272     return str_trunc (txt, trunc_len);
 273 }
 274
 275 /*
 276  * path_trunc() is the same as name_trunc() above but
 277  * it deletes possible password from path for security
 278  * reasons.
 279  */
 280 const char *
 281 path_trunc (const char *path, size_t trunc_len)
 282 {
 283     char *secure_path = strip_password (g_strdup (path), 1);
 284
 285     const char *ret = str_trunc (secure_path, trunc_len);
 286     g_free (secure_path);
 287
 288     return ret;
 289 }
 290
 291 const char *
 292 size_trunc (double size)
 293 {
 294     static char x[BUF_TINY];
 295     long int divisor = 1;
 296     const char *xtra = "";
 297
 298     if (size > 999999999L)
 299     {
 300         divisor = kilobyte_si ? 1000 : 1024;
 301         xtra = kilobyte_si ? "k" : "K";
 302         if (size / divisor > 999999999L)
 303         {
 304             divisor = kilobyte_si ? (1000 * 1000) : (1024 * 1024);
 305             xtra = kilobyte_si ? "m" : "M";
 306         }
 307     }
 308     g_snprintf (x, sizeof (x), "%.0f%s", (size / divisor), xtra);
 309     return x;
 310 }
 311
 312 const char *
 313 size_trunc_sep (double size)
 314 {
 315     static char x[60];
 316     int count;
 317     const char *p, *y;
 318     char *d;
 319
 320     p = y = size_trunc (size);
 321     p += strlen (p) - 1;
 322     d = x + sizeof (x) - 1;
 323     *d-- = 0;
 324     while (p >= y && isalpha ((unsigned char) *p))
 325         *d-- = *p--;
 326     for (count = 0; p >= y; count++)
 327     {
 328         if (count == 3)
 329         {
 330             *d-- = ',';
 331             count = 0;
 332         }
 333         *d-- = *p--;
 334     }
 335     d++;
 336     if (*d == ',')
 337         d++;
 338     return d;
 339 }
 340
 341 /*
 342  * Print file SIZE to BUFFER, but don't exceed LEN characters,
 343  * not including trailing 0. BUFFER should be at least LEN+1 long.
 344  * This function is called for every file on panels, so avoid
 345  * floating point by any means.
 346  *
 347  * Units: size units (filesystem sizes are 1K blocks)
 348  *    0=bytes, 1=Kbytes, 2=Mbytes, etc.
 349  */
 350 void
 351 size_trunc_len (char *buffer, unsigned int len, off_t size, int units)
 352 {
 353     /* Avoid taking power for every file.  */
 354     static const off_t power10[] = { 1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000,
 355         1000000000
 356     };
 357     static const char *const suffix[] = { "", "K", "M", "G", "T", "P", "E", "Z", "Y", NULL };
 358     static const char *const suffix_lc[] = { "", "k", "m", "g", "t", "p", "e", "z", "y", NULL };
 359     int j = 0;
 360     int size_remain;
 361
 362     if (len == 0)
 363         len = 9;
 364
 365     /*
 366      * recalculate from 1024 base to 1000 base if units>0
 367      * We can't just multiply by 1024 - that might cause overflow
 368      * if off_t type is too small
 369      */
 370     if (units && kilobyte_si)
 371     {
 372         for (j = 0; j < units; j++)
 373         {
 374             size_remain = ((size % 125) * 1024) / 1000; /* size mod 125, recalculated */
 375             size = size / 125;  /* 128/125 = 1024/1000 */
 376             size = size * 128;  /* This will convert size from multiple of 1024 to multiple of 1000 */
 377             size += size_remain;        /* Re-add remainder lost by division/multiplication */
 378         }
 379     }
 380
 381     for (j = units; suffix[j] != NULL; j++)
 382     {
 383         if (size == 0)
 384         {
 385             if (j == units)
 386             {
 387                 /* Empty files will print "0" even with minimal width.  */
 388                 g_snprintf (buffer, len + 1, "0");
 389                 break;
 390             }
 391
 392             /* Use "~K" or just "K" if len is 1.  Use "B" for bytes.  */
 393             g_snprintf (buffer, len + 1, (len > 1) ? "~%s" : "%s",
 394                         (j > 1) ? (kilobyte_si ? suffix_lc[j - 1] : suffix[j - 1]) : "B");
 395             break;
 396         }
 397
 398         if (size < power10[len - (j > 0)])
 399         {
 400             g_snprintf (buffer, len + 1, "%lu%s", (unsigned long) size,
 401                         kilobyte_si ? suffix_lc[j] : suffix[j]);
 402             break;
 403         }
 404
 405         /* Powers of 1000 or 1024, with rounding.  */
 406         if (kilobyte_si)
 407         {
 408             size = (size + 500) / 1000;
 409         }
 410         else
 411         {
 412             size = (size + 512) >> 10;
 413         }
 414     }
 415 }
 416
 417 int
 418 is_exe (mode_t mode)
 419 {
 420     if ((S_IXUSR & mode) || (S_IXGRP & mode) || (S_IXOTH & mode))
 421         return 1;
 422     return 0;
 423 }
 424
 425 #define ismode(n,m) ((n & m) == m)
 426
 427 const char *
 428 string_perm (mode_t mode_bits)
 429 {
 430     static char mode[11];
 431
 432     strcpy (mode, "----------");
 433     if (S_ISDIR (mode_bits))
 434         mode[0] = 'd';
 435     if (S_ISCHR (mode_bits))
 436         mode[0] = 'c';
 437     if (S_ISBLK (mode_bits))
 438         mode[0] = 'b';
 439     if (S_ISLNK (mode_bits))
 440         mode[0] = 'l';
 441     if (S_ISFIFO (mode_bits))
 442         mode[0] = 'p';
 443     if (S_ISNAM (mode_bits))
 444         mode[0] = 'n';
 445     if (S_ISSOCK (mode_bits))
 446         mode[0] = 's';
 447     if (S_ISDOOR (mode_bits))
 448         mode[0] = 'D';
 449     if (ismode (mode_bits, S_IXOTH))
 450         mode[9] = 'x';
 451     if (ismode (mode_bits, S_IWOTH))
 452         mode[8] = 'w';
 453     if (ismode (mode_bits, S_IROTH))
 454         mode[7] = 'r';
 455     if (ismode (mode_bits, S_IXGRP))
 456         mode[6] = 'x';
 457     if (ismode (mode_bits, S_IWGRP))
 458         mode[5] = 'w';
 459     if (ismode (mode_bits, S_IRGRP))
 460         mode[4] = 'r';
 461     if (ismode (mode_bits, S_IXUSR))
 462         mode[3] = 'x';
 463     if (ismode (mode_bits, S_IWUSR))
 464         mode[2] = 'w';
 465     if (ismode (mode_bits, S_IRUSR))
 466         mode[1] = 'r';
 467 #ifdef S_ISUID
 468     if (ismode (mode_bits, S_ISUID))
 469         mode[3] = (mode[3] == 'x') ? 's' : 'S';
 470 #endif /* S_ISUID */
 471 #ifdef S_ISGID
 472     if (ismode (mode_bits, S_ISGID))
 473         mode[6] = (mode[6] == 'x') ? 's' : 'S';
 474 #endif /* S_ISGID */
 475 #ifdef S_ISVTX
 476     if (ismode (mode_bits, S_ISVTX))
 477         mode[9] = (mode[9] == 'x') ? 't' : 'T';
 478 #endif /* S_ISVTX */
 479     return mode;
 480 }
 481
 482 /* p: string which might contain an url with a password (this parameter is
 483    modified in place).
 484    has_prefix = 0: The first parameter is an url without a prefix
 485    (user[:pass]@]machine[:port][remote-dir). Delete
 486    the password.
 487    has_prefix = 1: Search p for known url prefixes. If found delete
 488    the password from the url.
 489    Caveat: only the first url is found
 490  */
 491 char *
 492 strip_password (char *p, int has_prefix)
 493 {
 494     static const struct
 495     {
 496         const char *name;
 497         size_t len;
 498     } prefixes[] =
 499     {
 500         {
 501         "/#ftp:", 6},
 502         {
 503         "ftp://", 6},
 504         {
 505         "/#mc:", 5},
 506         {
 507         "mc://", 5},
 508         {
 509         "/#smb:", 6},
 510         {
 511         "smb://", 6},
 512         {
 513         "/#sh:", 5},
 514         {
 515         "sh://", 5},
 516         {
 517         "ssh://", 6}
 518     };
 519     char *at, *inner_colon, *dir;
 520     size_t i;
 521     char *result = p;
 522
 523     for (i = 0; i < sizeof (prefixes) / sizeof (prefixes[0]); i++)
 524     {
 525         char *q;
 526
 527         if (has_prefix)
 528         {
 529             if ((q = strstr (p, prefixes[i].name)) == 0)
 530                 continue;
 531             else
 532                 p = q + prefixes[i].len;
 533         }
 534
 535         if ((dir = strchr (p, PATH_SEP)) != NULL)
 536             *dir = '\0';
 537
 538         /* search for any possible user */
 539         at = strrchr (p, '@');
 540
 541         if (dir)
 542             *dir = PATH_SEP;
 543
 544         /* We have a username */
 545         if (at)
 546         {
 547             inner_colon = memchr (p, ':', at - p);
 548             if (inner_colon)
 549                 memmove (inner_colon, at, strlen (at) + 1);
 550         }
 551         break;
 552     }
 553     return (result);
 554 }
 555
 556 const char *
 557 strip_home_and_password (const char *dir)
 558 {
 559     size_t len;
 560     static char newdir[MC_MAXPATHLEN];
 561
 562     if (home_dir && !strncmp (dir, home_dir, len = strlen (home_dir)) &&
 563         (dir[len] == PATH_SEP || dir[len] == '\0'))
 564     {
 565         newdir[0] = '~';
 566         g_strlcpy (&newdir[1], &dir[len], sizeof (newdir) - 1);
 567         return newdir;
 568     }
 569
 570     /* We do not strip homes in /#ftp tree, I do not like ~'s there
 571        (see ftpfs.c why) */
 572     g_strlcpy (newdir, dir, sizeof (newdir));
 573     strip_password (newdir, 1);
 574     return newdir;
 575 }
 576
 577 const char *
 578 extension (const char *filename)
 579 {
 580     const char *d = strrchr (filename, '.');
 581     return (d != NULL) ? d + 1 : "";
 582 }
 583
 584 int
 585 exist_file (const char *name)
 586 {
 587     return access (name, R_OK) == 0;
 588 }
 589
 590 int
 591 check_for_default (const char *default_file, const char *file)
 592 {
 593     if (!exist_file (file))
 594     {
 595         FileOpContext *ctx;
 596         FileOpTotalContext *tctx;
 597
 598         if (!exist_file (default_file))
 599             return -1;
 600
 601         ctx = file_op_context_new (OP_COPY);
 602         tctx = file_op_total_context_new ();
 603         file_op_context_create_ui (ctx, 0, FALSE);
 604         copy_file_file (tctx, ctx, default_file, file);
 605         file_op_total_context_destroy (tctx);
 606         file_op_context_destroy (ctx);
 607     }
 608
 609     return 0;
 610 }
 611
 612
 613
 614 char *
 615 load_file (const char *filename)
 616 {
 617     FILE *data_file;
 618     struct stat s;
 619     char *data;
 620     long read_size;
 621
 622     if ((data_file = fopen (filename, "r")) == NULL)
 623     {
 624         return 0;
 625     }
 626     if (fstat (fileno (data_file), &s) != 0)
 627     {
 628         fclose (data_file);
 629         return 0;
 630     }
 631     data = g_malloc (s.st_size + 1);
 632     read_size = fread (data, 1, s.st_size, data_file);
 633     data[read_size] = 0;
 634     fclose (data_file);
 635
 636     if (read_size > 0)
 637         return data;
 638     else
 639     {
 640         g_free (data);
 641         return 0;
 642     }
 643 }
 644
 645 char *
 646 load_mc_home_file (const char *_mc_home, const char *_mc_home_alt, const char *filename,
 647                    char **allocated_filename)
 648 {
 649     char *hintfile_base, *hintfile;
 650     char *lang;
 651     char *data;
 652
 653     hintfile_base = concat_dir_and_file (_mc_home, filename);
 654     lang = guess_message_value ();
 655
 656     hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 657     data = load_file (hintfile);
 658
 659     if (!data)
 660     {
 661         g_free (hintfile);
 662         g_free (hintfile_base);
 663         hintfile_base = concat_dir_and_file (_mc_home_alt, filename);
 664
 665         hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 666         data = load_file (hintfile);
 667
 668         if (!data)
 669         {
 670             /* Fall back to the two-letter language code */
 671             if (lang[0] && lang[1])
 672                 lang[2] = 0;
 673             g_free (hintfile);
 674             hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 675             data = load_file (hintfile);
 676
 677             if (!data)
 678             {
 679                 g_free (hintfile);
 680                 hintfile = hintfile_base;
 681                 data = load_file (hintfile_base);
 682             }
 683         }
 684     }
 685
 686     g_free (lang);
 687
 688     if (hintfile != hintfile_base)
 689         g_free (hintfile_base);
 690
 691     if (allocated_filename)
 692         *allocated_filename = hintfile;
 693     else
 694         g_free (hintfile);
 695
 696     return data;
 697 }
 698
 699 /* Check strftime() results. Some systems (i.e. Solaris) have different
 700    short-month and month name sizes for different locales */
 701 size_t
 702 i18n_checktimelength (void)
 703 {
 704     size_t length = 0;
 705     const time_t testtime = time (NULL);
 706     struct tm *lt = localtime (&testtime);
 707
 708     if (i18n_timelength_cache <= MAX_I18NTIMELENGTH)
 709         return i18n_timelength_cache;
 710
 711     if (lt == NULL)
 712     {
 713         /* huh, localtime() doesnt seem to work ... falling back to "(invalid)" */
 714         length = str_term_width1 (_(INVALID_TIME_TEXT));
 715     }
 716     else
 717     {
 718         char buf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1];
 719
 720         /* We are interested in the longest possible date */
 721         lt->tm_sec = lt->tm_min = lt->tm_hour = lt->tm_mday = 10;
 722
 723         /* Loop through all months to find out the longest one */
 724         for (lt->tm_mon = 0; lt->tm_mon < 12; lt->tm_mon++) {
 725             strftime (buf, sizeof(buf) - 1, user_recent_timeformat, lt);
 726             length = max ((size_t) str_term_width1 (buf), length);
 727             strftime (buf, sizeof(buf) - 1, user_old_timeformat, lt);
 728             length = max ((size_t) str_term_width1 (buf), length);
 729         }
 730
 731         length = max ((size_t) str_term_width1 (_(INVALID_TIME_TEXT)), length);
 732     }
 733
 734     /* Don't handle big differences. Use standard value (email bug, please) */
 735     if (length > MAX_I18NTIMELENGTH || length < MIN_I18NTIMELENGTH)
 736         length = STD_I18NTIMELENGTH;
 737
 738     /* Save obtained value to the cache */
 739     i18n_timelength_cache = length;
 740
 741     return i18n_timelength_cache;
 742 }
 743
 744 const char *
 745 file_date (time_t when)
 746 {
 747     static char timebuf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1];
 748     time_t current_time = time ((time_t) 0);
 749     const char *fmt;
 750
 751     if (current_time > when + 6L * 30L * 24L * 60L * 60L        /* Old. */
 752         || current_time < when - 60L * 60L)     /* In the future. */
 753         /* The file is fairly old or in the future.
 754            POSIX says the cutoff is 6 months old;
 755            approximate this by 6*30 days.
 756            Allow a 1 hour slop factor for what is considered "the future",
 757            to allow for NFS server/client clock disagreement.
 758            Show the year instead of the time of day.  */
 759
 760         fmt = user_old_timeformat;
 761     else
 762         fmt = user_recent_timeformat;
 763
 764     FMT_LOCALTIME (timebuf, sizeof (timebuf), fmt, when);
 765
 766     return timebuf;
 767 }
 768
 769 const char *
 770 extract_line (const char *s, const char *top)
 771 {
 772     static char tmp_line[BUF_MEDIUM];
 773     char *t = tmp_line;
 774
 775     while (*s && *s != '\n' && (size_t) (t - tmp_line) < sizeof (tmp_line) - 1 && s < top)
 776         *t++ = *s++;
 777     *t = 0;
 778     return tmp_line;
 779 }
 780
 781 /* The basename routine */
 782 const char *
 783 x_basename (const char *s)
 784 {
 785     const char *where;
 786     return ((where = strrchr (s, PATH_SEP))) ? where + 1 : s;
 787 }
 788
 789
 790 const char *
 791 unix_error_string (int error_num)
 792 {
 793     static char buffer[BUF_LARGE];
 794     gchar *strerror_currentlocale;
 795
 796     strerror_currentlocale = g_locale_from_utf8 (g_strerror (error_num), -1, NULL, NULL, NULL);
 797     g_snprintf (buffer, sizeof (buffer), "%s (%d)", strerror_currentlocale, error_num);
 798     g_free (strerror_currentlocale);
 799
 800     return buffer;
 801 }
 802
 803 const char *
 804 skip_separators (const char *s)
 805 {
 806     const char *su = s;
 807
 808     for (; *su; str_cnext_char (&su))
 809         if (*su != ' ' && *su != '\t' && *su != ',')
 810             break;
 811
 812     return su;
 813 }
 814
 815 const char *
 816 skip_numbers (const char *s)
 817 {
 818     const char *su = s;
 819
 820     for (; *su; str_cnext_char (&su))
 821         if (!str_isdigit (su))
 822             break;
 823
 824     return su;
 825 }
 826
 827 /* Remove all control sequences from the argument string.  We define
 828  * "control sequence", in a sort of pidgin BNF, as follows:
 829  *
 830  * control-seq = Esc non-'['
 831  *             | Esc '[' (0 or more digits or ';' or '?') (any other char)
 832  *
 833  * This scheme works for all the terminals described in my termcap /
 834  * terminfo databases, except the Hewlett-Packard 70092 and some Wyse
 835  * terminals.  If I hear from a single person who uses such a terminal
 836  * with MC, I'll be glad to add support for it.  (Dugan)
 837  * Non-printable characters are also removed.
 838  */
 839
 840 char *
 841 strip_ctrl_codes (char *s)
 842 {
 843     char *w;                    /* Current position where the stripped data is written */
 844     char *r;                    /* Current position where the original data is read */
 845     char *n;
 846
 847     if (!s)
 848         return 0;
 849
 850     for (w = s, r = s; *r;)
 851     {
 852         if (*r == ESC_CHAR)
 853         {
 854             /* Skip the control sequence's arguments */ ;
 855             /* '(' need to avoid strange 'B' letter in *Suse (if mc runs under root user) */
 856             if (*(++r) == '[' || *r == '(')
 857             {
 858                 /* strchr() matches trailing binary 0 */
 859                 while (*(++r) && strchr ("0123456789;?", *r));
 860             }
 861             else if (*r == ']')
 862             {
 863                 /*
 864                  * Skip xterm's OSC (Operating System Command)
 865                  * http://www.xfree86.org/current/ctlseqs.html
 866                  * OSC P s ; P t ST
 867                  * OSC P s ; P t BEL
 868                  */
 869                 char *new_r = r;
 870
 871                 for (; *new_r; ++new_r)
 872                 {
 873                     switch (*new_r)
 874                     {
 875                         /* BEL */
 876                     case '\a':
 877                         r = new_r;
 878                         goto osc_out;
 879                     case ESC_CHAR:
 880                         /* ST */
 881                         if (*(new_r + 1) == '\\')
 882                         {
 883                             r = new_r + 1;
 884                             goto osc_out;
 885                         }
 886                     }
 887                 }
 888               osc_out:;
 889             }
 890
 891             /*
 892              * Now we are at the last character of the sequence.
 893              * Skip it unless it's binary 0.
 894              */
 895             if (*r)
 896                 r++;
 897             continue;
 898         }
 899
 900         n = str_get_next_char (r);
 901         if (str_isprint (r))
 902         {
 903             memmove (w, r, n - r);
 904             w += n - r;
 905         }
 906         r = n;
 907     }
 908     *w = 0;
 909     return s;
 910 }
 911
 912
 913 #ifndef ENABLE_VFS
 914 char *
 915 get_current_wd (char *buffer, int size)
 916 {
 917     char *p;
 918     int len;
 919
 920     p = g_get_current_dir ();
 921     len = strlen (p) + 1;
 922
 923     if (len > size)
 924     {
 925         g_free (p);
 926         return NULL;
 927     }
 928
 929     memcpy (buffer, p, len);
 930     g_free (p);
 931
 932     return buffer;
 933 }
 934 #endif /* !ENABLE_VFS */
 935
 936 enum compression_type
 937 get_compression_type (int fd, const char *name)
 938 {
 939     unsigned char magic[16];
 940     size_t str_len;
 941
 942     /* Read the magic signature */
 943     if (mc_read (fd, (char *) magic, 4) != 4)
 944         return COMPRESSION_NONE;
 945
 946     /* GZIP_MAGIC and OLD_GZIP_MAGIC */
 947     if (magic[0] == 037 && (magic[1] == 0213 || magic[1] == 0236))
 948     {
 949         return COMPRESSION_GZIP;
 950     }
 951
 952     /* PKZIP_MAGIC */
 953     if (magic[0] == 0120 && magic[1] == 0113 && magic[2] == 003 && magic[3] == 004)
 954     {
 955         /* Read compression type */
 956         mc_lseek (fd, 8, SEEK_SET);
 957         if (mc_read (fd, (char *) magic, 2) != 2)
 958             return COMPRESSION_NONE;
 959
 960         /* Gzip can handle only deflated (8) or stored (0) files */
 961         if ((magic[0] != 8 && magic[0] != 0) || magic[1] != 0)
 962             return COMPRESSION_NONE;
 963
 964         /* Compatible with gzip */
 965         return COMPRESSION_GZIP;
 966     }
 967
 968     /* PACK_MAGIC and LZH_MAGIC and compress magic */
 969     if (magic[0] == 037 && (magic[1] == 036 || magic[1] == 0240 || magic[1] == 0235))
 970     {
 971         /* Compatible with gzip */
 972         return COMPRESSION_GZIP;
 973     }
 974
 975     /* BZIP and BZIP2 files */
 976     if ((magic[0] == 'B') && (magic[1] == 'Z') && (magic[3] >= '1') && (magic[3] <= '9'))
 977     {
 978         switch (magic[2])
 979         {
 980         case '0':
 981             return COMPRESSION_BZIP;
 982         case 'h':
 983             return COMPRESSION_BZIP2;
 984         }
 985     }
 986
 987     /* Support for LZMA (only utils format with magic in header).
 988      * This is the default format of LZMA utils 4.32.1 and later. */
 989
 990     if (mc_read (fd, (char *) magic + 4, 2) != 2)
 991         return COMPRESSION_NONE;
 992
 993     /* LZMA utils format */
 994     if (magic[0] == 0xFF
 995         && magic[1] == 'L'
 996         && magic[2] == 'Z' && magic[3] == 'M' && magic[4] == 'A' && magic[5] == 0x00)
 997         return COMPRESSION_LZMA;
 998
 999     /* XZ compression magic */
1000     if (magic[0] == 0xFD
1001         && magic[1] == 0x37
1002         && magic[2] == 0x7A && magic[3] == 0x58 && magic[4] == 0x5A && magic[5] == 0x00)
1003         return COMPRESSION_XZ;
1004
1005     str_len = strlen (name);
1006     /* HACK: we must belive to extention of LZMA file :) ... */
1007     if ((str_len > 5 && strcmp (&name[str_len - 5], ".lzma") == 0) ||
1008         (str_len > 4 && strcmp (&name[str_len - 4], ".tlz") == 0))
1009         return COMPRESSION_LZMA;
1010
1011     return COMPRESSION_NONE;
1012 }
1013
1014 const char *
1015 decompress_extension (int type)
1016 {
1017     switch (type)
1018     {
1019     case COMPRESSION_GZIP:
1020         return "#ugz";
1021     case COMPRESSION_BZIP:
1022         return "#ubz";
1023     case COMPRESSION_BZIP2:
1024         return "#ubz2";
1025     case COMPRESSION_LZMA:
1026         return "#ulzma";
1027     case COMPRESSION_XZ:
1028         return "#uxz";
1029     }
1030     /* Should never reach this place */
1031     fprintf (stderr, "Fatal: decompress_extension called with an unknown argument\n");
1032     return 0;
1033 }
1034
1035 /* Hooks */
1036 void
1037 add_hook (Hook ** hook_list, void (*hook_fn) (void *), void *data)
1038 {
1039     Hook *new_hook = g_new (Hook, 1);
1040
1041     new_hook->hook_fn = hook_fn;
1042     new_hook->next = *hook_list;
1043     new_hook->hook_data = data;
1044
1045     *hook_list = new_hook;
1046 }
1047
1048 void
1049 execute_hooks (Hook * hook_list)
1050 {
1051     Hook *new_hook = 0;
1052     Hook *p;
1053
1054     /* We copy the hook list first so tahat we let the hook
1055      * function call delete_hook
1056      */
1057
1058     while (hook_list)
1059     {
1060         add_hook (&new_hook, hook_list->hook_fn, hook_list->hook_data);
1061         hook_list = hook_list->next;
1062     }
1063     p = new_hook;
1064
1065     while (new_hook)
1066     {
1067         (*new_hook->hook_fn) (new_hook->hook_data);
1068         new_hook = new_hook->next;
1069     }
1070
1071     for (hook_list = p; hook_list;)
1072     {
1073         p = hook_list;
1074         hook_list = hook_list->next;
1075         g_free (p);
1076     }
1077 }
1078
1079 void
1080 delete_hook (Hook ** hook_list, void (*hook_fn) (void *))
1081 {
1082     Hook *current, *new_list, *next;
1083
1084     new_list = 0;
1085
1086     for (current = *hook_list; current; current = next)
1087     {
1088         next = current->next;
1089         if (current->hook_fn == hook_fn)
1090             g_free (current);
1091         else
1092             add_hook (&new_list, current->hook_fn, current->hook_data);
1093     }
1094     *hook_list = new_list;
1095 }
1096
1097 int
1098 hook_present (Hook * hook_list, void (*hook_fn) (void *))
1099 {
1100     Hook *p;
1101
1102     for (p = hook_list; p; p = p->next)
1103         if (p->hook_fn == hook_fn)
1104             return 1;
1105     return 0;
1106 }
1107
1108 void
1109 wipe_password (char *passwd)
1110 {
1111     char *p = passwd;
1112
1113     if (!p)
1114         return;
1115     for (; *p; p++)
1116         *p = 0;
1117     g_free (passwd);
1118 }
1119
1120 /* Convert "\E" -> esc character and ^x to control-x key and ^^ to ^ key */
1121 /* Returns a newly allocated string */
1122 char *
1123 convert_controls (const char *p)
1124 {
1125     char *valcopy = g_strdup (p);
1126     char *q;
1127
1128     /* Parse the escape special character */
1129     for (q = valcopy; *p;)
1130     {
1131         if (*p == '\\')
1132         {
1133             p++;
1134             if ((*p == 'e') || (*p == 'E'))
1135             {
1136                 p++;
1137                 *q++ = ESC_CHAR;
1138             }
1139         }
1140         else
1141         {
1142             if (*p == '^')
1143             {
1144                 p++;
1145                 if (*p == '^')
1146                     *q++ = *p++;
1147                 else
1148                 {
1149                     char c = (*p | 0x20);
1150                     if (c >= 'a' && c <= 'z')
1151                     {
1152                         *q++ = c - 'a' + 1;
1153                         p++;
1154                     }
1155                     else if (*p)
1156                         p++;
1157                 }
1158             }
1159             else
1160                 *q++ = *p++;
1161         }
1162     }
1163     *q = 0;
1164     return valcopy;
1165 }
1166
1167 static char *
1168 resolve_symlinks (const char *path)
1169 {
1170     char *buf, *buf2, *q, *r, c;
1171     int len;
1172     struct stat mybuf;
1173     const char *p;
1174
1175     if (*path != PATH_SEP)
1176         return NULL;
1177     r = buf = g_malloc (MC_MAXPATHLEN);
1178     buf2 = g_malloc (MC_MAXPATHLEN);
1179     *r++ = PATH_SEP;
1180     *r = 0;
1181     p = path;
1182     for (;;)
1183     {
1184         q = strchr (p + 1, PATH_SEP);
1185         if (!q)
1186         {
1187             q = strchr (p + 1, 0);
1188             if (q == p + 1)
1189                 break;
1190         }
1191         c = *q;
1192         *q = 0;
1193         if (mc_lstat (path, &mybuf) < 0)
1194         {
1195             g_free (buf);
1196             g_free (buf2);
1197             *q = c;
1198             return NULL;
1199         }
1200         if (!S_ISLNK (mybuf.st_mode))
1201             strcpy (r, p + 1);
1202         else
1203         {
1204             len = mc_readlink (path, buf2, MC_MAXPATHLEN - 1);
1205             if (len < 0)
1206             {
1207                 g_free (buf);
1208                 g_free (buf2);
1209                 *q = c;
1210                 return NULL;
1211             }
1212             buf2[len] = 0;
1213             if (*buf2 == PATH_SEP)
1214                 strcpy (buf, buf2);
1215             else
1216                 strcpy (r, buf2);
1217         }
1218         canonicalize_pathname (buf);
1219         r = strchr (buf, 0);
1220         if (!*r || *(r - 1) != PATH_SEP)
1221         {
1222             *r++ = PATH_SEP;
1223             *r = 0;
1224         }
1225         *q = c;
1226         p = q;
1227         if (!c)
1228             break;
1229     }
1230     if (!*buf)
1231         strcpy (buf, PATH_SEP_STR);
1232     else if (*(r - 1) == PATH_SEP && r != buf + 1)
1233         *(r - 1) = 0;
1234     g_free (buf2);
1235     return buf;
1236 }
1237
1238 static gboolean
1239 mc_util_write_backup_content (const char *from_file_name, const char *to_file_name)
1240 {
1241     FILE *backup_fd;
1242     char *contents;
1243     gsize length;
1244     gboolean ret1 = TRUE;
1245
1246     if (!g_file_get_contents (from_file_name, &contents, &length, NULL))
1247         return FALSE;
1248
1249     backup_fd = fopen (to_file_name, "w");
1250     if (backup_fd == NULL)
1251     {
1252         g_free (contents);
1253         return FALSE;
1254     }
1255
1256     if (fwrite ((const void *) contents, length, 1, backup_fd) != length)
1257         ret1 = FALSE;
1258     {
1259         int ret2;
1260         ret2 = fflush (backup_fd);
1261         ret2 = fclose (backup_fd);
1262     }
1263     g_free (contents);
1264     return ret1;
1265 }
1266
1267 /* Finds out a relative path from first to second, i.e. goes as many ..
1268  * as needed up in first and then goes down using second */
1269 char *
1270 diff_two_paths (const char *first, const char *second)
1271 {
1272     char *p, *q, *r, *s, *buf = NULL;
1273     int i, j, prevlen = -1, currlen;
1274     char *my_first = NULL, *my_second = NULL;
1275
1276     my_first = resolve_symlinks (first);
1277     if (my_first == NULL)
1278         return NULL;
1279     my_second = resolve_symlinks (second);
1280     if (my_second == NULL)
1281     {
1282         g_free (my_first);
1283         return NULL;
1284     }
1285     for (j = 0; j < 2; j++)
1286     {
1287         p = my_first;
1288         q = my_second;
1289         for (;;)
1290         {
1291             r = strchr (p, PATH_SEP);
1292             s = strchr (q, PATH_SEP);
1293             if (!r || !s)
1294                 break;
1295             *r = 0;
1296             *s = 0;
1297             if (strcmp (p, q))
1298             {
1299                 *r = PATH_SEP;
1300                 *s = PATH_SEP;
1301                 break;
1302             }
1303             else
1304             {
1305                 *r = PATH_SEP;
1306                 *s = PATH_SEP;
1307             }
1308             p = r + 1;
1309             q = s + 1;
1310         }
1311         p--;
1312         for (i = 0; (p = strchr (p + 1, PATH_SEP)) != NULL; i++);
1313         currlen = (i + 1) * 3 + strlen (q) + 1;
1314         if (j)
1315         {
1316             if (currlen < prevlen)
1317                 g_free (buf);
1318             else
1319             {
1320                 g_free (my_first);
1321                 g_free (my_second);
1322                 return buf;
1323             }
1324         }
1325         p = buf = g_malloc (currlen);
1326         prevlen = currlen;
1327         for (; i >= 0; i--, p += 3)
1328             strcpy (p, "../");
1329         strcpy (p, q);
1330     }
1331     g_free (my_first);
1332     g_free (my_second);
1333     return buf;
1334 }
1335
1336 /* If filename is NULL, then we just append PATH_SEP to the dir */
1337 char *
1338 concat_dir_and_file (const char *dir, const char *file)
1339 {
1340     int i = strlen (dir);
1341
1342     if (dir[i - 1] == PATH_SEP)
1343         return g_strconcat (dir, file, (char *) NULL);
1344     else
1345         return g_strconcat (dir, PATH_SEP_STR, file, (char *) NULL);
1346 }
1347
1348 /* Append text to GList, remove all entries with the same text */
1349 GList *
1350 list_append_unique (GList * list, char *text)
1351 {
1352     GList *lc_link;
1353
1354     /*
1355      * Go to the last position and traverse the list backwards
1356      * starting from the second last entry to make sure that we
1357      * are not removing the current link.
1358      */
1359     list = g_list_append (list, text);
1360     list = g_list_last (list);
1361     lc_link = g_list_previous (list);
1362
1363     while (lc_link != NULL)
1364     {
1365         GList *newlink;
1366
1367         newlink = g_list_previous (lc_link);
1368         if (strcmp ((char *) lc_link->data, text) == 0)
1369         {
1370             GList *tmp;
1371
1372             g_free (lc_link->data);
1373             tmp = g_list_remove_link (list, lc_link);
1374             g_list_free_1 (lc_link);
1375         }
1376         lc_link = newlink;
1377     }
1378
1379     return list;
1380 }
1381
1382 /* Following code heavily borrows from libiberty, mkstemps.c */
1383
1384 /* Number of attempts to create a temporary file */
1385 #ifndef TMP_MAX
1386 #define TMP_MAX 16384
1387 #endif /* !TMP_MAX */
1388
1389 /*
1390  * Arguments:
1391  * pname (output) - pointer to the name of the temp file (needs g_free).
1392  *                  NULL if the function fails.
1393  * prefix - part of the filename before the random part.
1394  *          Prepend $TMPDIR or /tmp if there are no path separators.
1395  * suffix - if not NULL, part of the filename after the random part.
1396  *
1397  * Result:
1398  * handle of the open file or -1 if couldn't open any.
1399  */
1400 int
1401 mc_mkstemps (char **pname, const char *prefix, const char *suffix)
1402 {
1403     static const char letters[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
1404     static unsigned long value;
1405     struct timeval tv;
1406     char *tmpbase;
1407     char *tmpname;
1408     char *XXXXXX;
1409     int count;
1410
1411     if (strchr (prefix, PATH_SEP) == NULL)
1412     {
1413         /* Add prefix first to find the position of XXXXXX */
1414         tmpbase = concat_dir_and_file (mc_tmpdir (), prefix);
1415     }
1416     else
1417     {
1418         tmpbase = g_strdup (prefix);
1419     }
1420
1421     tmpname = g_strconcat (tmpbase, "XXXXXX", suffix, (char *) NULL);
1422     *pname = tmpname;
1423     XXXXXX = &tmpname[strlen (tmpbase)];
1424     g_free (tmpbase);
1425
1426     /* Get some more or less random data.  */
1427     gettimeofday (&tv, NULL);
1428     value += (tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
1429
1430     for (count = 0; count < TMP_MAX; ++count)
1431     {
1432         unsigned long v = value;
1433         int fd;
1434
1435         /* Fill in the random bits.  */
1436         XXXXXX[0] = letters[v % 62];
1437         v /= 62;
1438         XXXXXX[1] = letters[v % 62];
1439         v /= 62;
1440         XXXXXX[2] = letters[v % 62];
1441         v /= 62;
1442         XXXXXX[3] = letters[v % 62];
1443         v /= 62;
1444         XXXXXX[4] = letters[v % 62];
1445         v /= 62;
1446         XXXXXX[5] = letters[v % 62];
1447
1448         fd = open (tmpname, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, S_IRUSR | S_IWUSR);
1449         if (fd >= 0)
1450         {
1451             /* Successfully created.  */
1452             return fd;
1453         }
1454
1455         /* This is a random value.  It is only necessary that the next
1456            TMP_MAX values generated by adding 7777 to VALUE are different
1457            with (module 2^32).  */
1458         value += 7777;
1459     }
1460
1461     /* Unsuccessful. Free the filename. */
1462     g_free (tmpname);
1463     *pname = NULL;
1464
1465     return -1;
1466 }
1467
1468 /*
1469  * Read and restore position for the given filename.
1470  * If there is no stored data, return line 1 and col 0.
1471  */
1472 void
1473 load_file_position (const char *filename, long *line, long *column, off_t * offset)
1474 {
1475     char *fn;
1476     FILE *f;
1477     char buf[MC_MAXPATHLEN + 20];
1478     int len;
1479
1480     /* defaults */
1481     *line = 1;
1482     *column = 0;
1483     *offset = 0;
1484
1485     /* open file with positions */
1486     fn = g_build_filename (home_dir, MC_USERCONF_DIR, MC_FILEPOS_FILE, NULL);
1487     f = fopen (fn, "r");
1488     g_free (fn);
1489     if (!f)
1490         return;
1491
1492     len = strlen (filename);
1493
1494     while (fgets (buf, sizeof (buf), f))
1495     {
1496         const char *p;
1497         gchar **pos_tokens;
1498
1499         /* check if the filename matches the beginning of string */
1500         if (strncmp (buf, filename, len) != 0)
1501             continue;
1502
1503         /* followed by single space */
1504         if (buf[len] != ' ')
1505             continue;
1506
1507         /* and string without spaces */
1508         p = &buf[len + 1];
1509         if (strchr (p, ' '))
1510             continue;
1511
1512         pos_tokens = g_strsplit_set (p, ";", 3);
1513         if (pos_tokens[0] != NULL)
1514         {
1515             *line = strtol (pos_tokens[0], NULL, 10);
1516             if (pos_tokens[1] != NULL)
1517             {
1518                 *column = strtol (pos_tokens[1], NULL, 10);
1519                 if (pos_tokens[2] != NULL)
1520                     *offset = strtoll (pos_tokens[2], NULL, 10);
1521                 else
1522                     *offset = 0;
1523             }
1524             else
1525             {
1526                 *column = 0;
1527                 *offset = 0;
1528             }
1529         }
1530         else
1531         {
1532             *line = 1;
1533             *column = 0;
1534             *offset = 0;
1535         }
1536         g_strfreev (pos_tokens);
1537     }
1538     fclose (f);
1539 }
1540
1541 /* Save position for the given file */
1542 #define TMP_SUFFIX ".tmp"
1543 void
1544 save_file_position (const char *filename, long line, long column, off_t offset)
1545 {
1546     static int filepos_max_saved_entries = 0;
1547     char *fn, *tmp_fn;
1548     FILE *f, *tmp_f;
1549     char buf[MC_MAXPATHLEN + 20];
1550     int i = 1;
1551     gsize len;
1552
1553     if (filepos_max_saved_entries == 0)
1554         filepos_max_saved_entries =
1555             mc_config_get_int (mc_main_config, CONFIG_APP_SECTION, "filepos_max_saved_entries",
1556                                1024);
1557
1558     fn = g_build_filename (home_dir, MC_USERCONF_DIR, MC_FILEPOS_FILE, NULL);
1559     if (fn == NULL)
1560         goto early_error;
1561
1562     len = strlen (filename);
1563
1564     mc_util_make_backup_if_possible (fn, TMP_SUFFIX);
1565
1566     /* open file */
1567     f = fopen (fn, "w");
1568     if (f == NULL)
1569         goto open_target_error;
1570
1571     tmp_fn = g_strdup_printf ("%s" TMP_SUFFIX, fn);
1572     tmp_f = fopen (tmp_fn, "r");
1573     if (tmp_f == NULL)
1574         goto open_source_error;
1575
1576     /* put the new record */
1577     if (line != 1 || column != 0)
1578     {
1579         if (fprintf (f, "%s %ld;%ld;%llu\n", filename, line, column, (unsigned long long) offset) <
1580             0)
1581             goto write_position_error;
1582     }
1583
1584     while (fgets (buf, sizeof (buf), tmp_f))
1585     {
1586         if (buf[len] == ' ' && strncmp (buf, filename, len) == 0 && !strchr (&buf[len + 1], ' '))
1587             continue;
1588
1589         fprintf (f, "%s", buf);
1590         if (++i > filepos_max_saved_entries)
1591             break;
1592     }
1593     fclose (tmp_f);
1594     g_free (tmp_fn);
1595     fclose (f);
1596     mc_util_unlink_backup_if_possible (fn, TMP_SUFFIX);
1597     g_free (fn);
1598     return;
1599
1600   write_position_error:
1601     fclose (tmp_f);
1602   open_source_error:
1603     g_free (tmp_fn);
1604     fclose (f);
1605     mc_util_restore_from_backup_if_possible (fn, TMP_SUFFIX);
1606   open_target_error:
1607     g_free (fn);
1608   early_error:
1609     return;
1610 }
1611
1612 #undef TMP_SUFFIX
1613 extern const char *
1614 cstrcasestr (const char *haystack, const char *needle)
1615 {
1616     char *nee = str_create_search_needle (needle, 0);
1617     const char *result = str_search_first (haystack, nee, 0);
1618     str_release_search_needle (nee, 0);
1619     return result;
1620 }
1621
1622 const char *
1623 cstrstr (const char *haystack, const char *needle)
1624 {
1625     return strstr (haystack, needle);
1626 }
1627
1628 extern char *
1629 str_unconst (const char *s)
1630 {
1631     return (char *) s;
1632 }
1633
1634 #define ASCII_A         (0x40 + 1)
1635 #define ASCII_Z         (0x40 + 26)
1636 #define ASCII_a         (0x60 + 1)
1637 #define ASCII_z         (0x60 + 26)
1638
1639 extern int
1640 ascii_alpha_to_cntrl (int ch)
1641 {
1642     if ((ch >= ASCII_A && ch <= ASCII_Z) || (ch >= ASCII_a && ch <= ASCII_z))
1643     {
1644         ch &= 0x1f;
1645     }
1646     return ch;
1647 }
1648
1649 const char *
1650 Q_ (const char *s)
1651 {
1652     const char *result, *sep;
1653
1654     result = _(s);
1655     sep = strchr (result, '|');
1656     return (sep != NULL) ? sep + 1 : result;
1657 }
1658
1659
1660 gboolean
1661 mc_util_make_backup_if_possible (const char *file_name, const char *backup_suffix)
1662 {
1663     struct stat stat_buf;
1664     char *backup_path;
1665     gboolean ret;
1666     if (!exist_file (file_name))
1667         return FALSE;
1668
1669     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1670
1671     if (backup_path == NULL)
1672         return FALSE;
1673
1674     ret = mc_util_write_backup_content (file_name, backup_path);
1675
1676     if (ret)
1677     {
1678         /* Backup file will have same ownership with main file. */
1679         if (stat (file_name, &stat_buf) == 0)
1680             chmod (backup_path, stat_buf.st_mode);
1681         else
1682             chmod (backup_path, S_IRUSR | S_IWUSR);
1683     }
1684
1685     g_free (backup_path);
1686
1687     return ret;
1688 }
1689
1690 gboolean
1691 mc_util_restore_from_backup_if_possible (const char *file_name, const char *backup_suffix)
1692 {
1693     gboolean ret;
1694     char *backup_path;
1695
1696     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1697     if (backup_path == NULL)
1698         return FALSE;
1699
1700     ret = mc_util_write_backup_content (backup_path, file_name);
1701     g_free (backup_path);
1702
1703     return ret;
1704 }
1705
1706 gboolean
1707 mc_util_unlink_backup_if_possible (const char *file_name, const char *backup_suffix)
1708 {
1709     char *backup_path;
1710
1711     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1712     if (backup_path == NULL)
1713         return FALSE;
1714
1715     if (exist_file (backup_path))
1716         mc_unlink (backup_path);
1717
1718     g_free (backup_path);
1719     return TRUE;
1720 }
1721
1722 /* partly taken from dcigettext.c, returns "" for default locale */
1723 /* value should be freed by calling function g_free() */
1724 char *
1725 guess_message_value (void)
1726 {
1727     static const char *const var[] = {
1728         /* Setting of LC_ALL overwrites all other.  */
1729         /* Do not use LANGUAGE for check user locale and drowing hints */
1730         "LC_ALL",
1731         /* Next comes the name of the desired category.  */
1732         "LC_MESSAGES",
1733         /* Last possibility is the LANG environment variable.  */
1734         "LANG",
1735         /* NULL exit loops */
1736         NULL
1737     };
1738
1739     unsigned i = 0;
1740     const char *locale = NULL;
1741
1742     while (var[i] != NULL)
1743     {
1744         locale = getenv (var[i]);
1745         if (locale != NULL && locale[0] != '\0')
1746             break;
1747         i++;
1748     }
1749
1750     if (locale == NULL)
1751         locale = "";
1752
1753     return g_strdup (locale);
1754 }