src/util.c

   1 /* Various utilities
   2    Copyright (C) 1994, 1995, 1996 the Free Software Foundation.
   3    Written 1994, 1995, 1996 by:
   4    Miguel de Icaza, Janne Kukonlehto, Dugan Porter,
   5    Jakub Jelinek, Mauricio Plaza.
   6
   7    The file_date routine is mostly from GNU's fileutils package,
   8    written by Richard Stallman and David MacKenzie.
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 2 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 #include <config.h>
  25
  26 #include <ctype.h>
  27 #include <limits.h>
  28 #include <stdarg.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 #include <sys/types.h>
  34 #include <sys/stat.h>
  35 #include <unistd.h>
  36
  37 #include "global.h"
  38 #include "profile.h"
  39 #include "main.h"               /* mc_home */
  40 #include "cmd.h"                /* guess_message_value */
  41 #include "mountlist.h"
  42 #include "win.h"                /* xterm_flag */
  43
  44 #ifdef HAVE_CHARSET
  45 #include "charsets.h"
  46 #endif
  47
  48 static const char app_text [] = "Midnight-Commander";
  49 int easy_patterns = 1;
  50
  51 extern void str_replace(char *s, char from, char to)
  52 {
  53     for (; *s != '\0'; s++) {
  54         if (*s == from)
  55             *s = to;
  56     }
  57 }
  58
  59 static inline int
  60 is_7bit_printable (unsigned char c)
  61 {
  62     return (c > 31 && c < 127);
  63 }
  64
  65 static inline int
  66 is_iso_printable (unsigned char c)
  67 {
  68     return ((c > 31 && c < 127) || c >= 160);
  69 }
  70
  71 static inline int
  72 is_8bit_printable (unsigned char c)
  73 {
  74     /* "Full 8 bits output" doesn't work on xterm */
  75     if (xterm_flag)
  76         return is_iso_printable (c);
  77
  78     return (c > 31 && c != 127 && c != 155);
  79 }
  80
  81 int
  82 is_printable (int c)
  83 {
  84     c &= 0xff;
  85
  86 #ifdef HAVE_CHARSET
  87     /* "Display bits" is ignored, since the user controls the output
  88        by setting the output codepage */
  89     return is_8bit_printable (c);
  90 #else
  91     if (!eight_bit_clean)
  92         return is_7bit_printable (c);
  93
  94     if (full_eight_bits) {
  95         return is_8bit_printable (c);
  96     } else
  97         return is_iso_printable (c);
  98 #endif                          /* !HAVE_CHARSET */
  99 }
 100
 101 /* Calculates the message dimensions (lines and columns) */
 102 void msglen (const char *text, int *lines, int *columns)
 103 {
 104     int nlines = 1; /* even the empty string takes one line */
 105     int ncolumns = 0;
 106     int colindex = 0;
 107
 108     for (; *text != '\0'; text++) {
 109         if (*text == '\n') {
 110             nlines++;
 111             colindex = 0;
 112         } else {
 113             colindex++;
 114             if (colindex > ncolumns)
 115                 ncolumns = colindex;
 116         }
 117     }
 118
 119     *lines = nlines;
 120     *columns = ncolumns;
 121 }
 122
 123 /*
 124  * Copy from s to d, and trim the beginning if necessary, and prepend
 125  * "..." in this case.  The destination string can have at most len
 126  * bytes, not counting trailing 0.
 127  */
 128 char *
 129 trim (const char *s, char *d, int len)
 130 {
 131     int source_len;
 132
 133     /* Sanity check */
 134     len = max (len, 0);
 135
 136     source_len = strlen (s);
 137     if (source_len > len) {
 138         /* Cannot fit the whole line */
 139         if (len <= 3) {
 140             /* We only have room for the dots */
 141             memset (d, '.', len);
 142             d[len] = 0;
 143             return d;
 144         } else {
 145             /* Begin with ... and add the rest of the source string */
 146             memset (d, '.', 3);
 147             strcpy (d + 3, s + 3 + source_len - len);
 148         }
 149     } else
 150         /* We can copy the whole line */
 151         strcpy (d, s);
 152     return d;
 153 }
 154
 155 /*
 156  * Quote the filename for the purpose of inserting it into the command
 157  * line.  If quote_percent is 1, replace "%" with "%%" - the percent is
 158  * processed by the mc command line.
 159  */
 160 char *
 161 name_quote (const char *s, int quote_percent)
 162 {
 163     char *ret, *d;
 164
 165     d = ret = g_malloc (strlen (s) * 2 + 2 + 1);
 166     if (*s == '-') {
 167         *d++ = '.';
 168         *d++ = '/';
 169     }
 170
 171     for (; *s; s++, d++) {
 172         switch (*s) {
 173         case '%':
 174             if (quote_percent)
 175                 *d++ = '%';
 176             break;
 177         case '\'':
 178         case '\\':
 179         case '\r':
 180         case '\n':
 181         case '\t':
 182         case '"':
 183         case ';':
 184         case ' ':
 185         case '?':
 186         case '|':
 187         case '[':
 188         case ']':
 189         case '{':
 190         case '}':
 191         case '<':
 192         case '>':
 193         case '`':
 194         case '!':
 195         case '$':
 196         case '&':
 197         case '*':
 198         case '(':
 199         case ')':
 200             *d++ = '\\';
 201             break;
 202         case '~':
 203         case '#':
 204             if (d == ret)
 205                 *d++ = '\\';
 206             break;
 207         }
 208         *d = *s;
 209     }
 210     *d = '\0';
 211     return ret;
 212 }
 213
 214 char *
 215 fake_name_quote (const char *s, int quote_percent)
 216 {
 217     (void) quote_percent;
 218     return g_strdup (s);
 219 }
 220
 221 /*
 222  * Remove the middle part of the string to fit given length.
 223  * Use "~" to show where the string was truncated.
 224  * Return static buffer, no need to free() it.
 225  */
 226 const char *
 227 name_trunc (const char *txt, int trunc_len)
 228 {
 229     static char x[MC_MAXPATHLEN + MC_MAXPATHLEN];
 230     int txt_len;
 231     char *p;
 232
 233     if ((size_t) trunc_len > sizeof (x) - 1) {
 234         trunc_len = sizeof (x) - 1;
 235     }
 236     txt_len = strlen (txt);
 237     if (txt_len <= trunc_len) {
 238         strcpy (x, txt);
 239     } else {
 240         int y = (trunc_len / 2) + (trunc_len % 2);
 241         strncpy (x, txt, y);
 242         strncpy (x + y, txt + txt_len - (trunc_len / 2), trunc_len / 2);
 243         x[y] = '~';
 244     }
 245     x[trunc_len] = 0;
 246     for (p = x; *p; p++)
 247         if (!is_printable (*p))
 248             *p = '?';
 249     return x;
 250 }
 251
 252 /*
 253  * path_trunc() is the same as name_trunc() above but
 254  * it deletes possible password from path for security
 255  * reasons.
 256  */
 257 const char *
 258 path_trunc (const char *path, int trunc_len) {
 259     const char *ret;
 260     char *secure_path = strip_password (g_strdup (path), 1);
 261
 262     ret = name_trunc (secure_path, trunc_len);
 263     g_free (secure_path);
 264
 265     return ret;
 266 }
 267
 268 const char *size_trunc (double size)
 269 {
 270     static char x [BUF_TINY];
 271     long int divisor = 1;
 272     const char *xtra = "";
 273
 274     if (size > 999999999L){
 275         divisor = 1024;
 276         xtra = "K";
 277         if (size/divisor > 999999999L){
 278             divisor = 1024*1024;
 279             xtra = "M";
 280         }
 281     }
 282     g_snprintf (x, sizeof (x), "%.0f%s", (size/divisor), xtra);
 283     return x;
 284 }
 285
 286 const char *size_trunc_sep (double size)
 287 {
 288     static char x [60];
 289     int  count;
 290     const char *p, *y;
 291     char *d;
 292
 293     p = y = size_trunc (size);
 294     p += strlen (p) - 1;
 295     d = x + sizeof (x) - 1;
 296     *d-- = 0;
 297     while (p >= y && isalpha ((unsigned char) *p))
 298         *d-- = *p--;
 299     for (count = 0; p >= y; count++){
 300         if (count == 3){
 301             *d-- = ',';
 302             count = 0;
 303         }
 304         *d-- = *p--;
 305     }
 306     d++;
 307     if (*d == ',')
 308         d++;
 309     return d;
 310 }
 311
 312 /*
 313  * Print file SIZE to BUFFER, but don't exceed LEN characters,
 314  * not including trailing 0. BUFFER should be at least LEN+1 long.
 315  * This function is called for every file on panels, so avoid
 316  * floating point by any means.
 317  *
 318  * Units: size units (filesystem sizes are 1K blocks)
 319  *    0=bytes, 1=Kbytes, 2=Mbytes, etc.
 320  */
 321 void
 322 size_trunc_len (char *buffer, int len, off_t size, int units)
 323 {
 324     /* Avoid taking power for every file.  */
 325     static const off_t power10 [] =
 326         {1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000,
 327          1000000000};
 328     static const char * const suffix [] =
 329         {"", "K", "M", "G", "T", "P", "E", "Z", "Y", NULL};
 330     int j = 0;
 331
 332     /* Don't print more than 9 digits - use suffix.  */
 333     if (len == 0 || len > 9)
 334         len = 9;
 335
 336     for (j = units; suffix [j] != NULL; j++) {
 337         if (size == 0) {
 338             if (j == units) {
 339                 /* Empty files will print "0" even with minimal width.  */
 340                 g_snprintf (buffer, len + 1, "0");
 341                 break;
 342             }
 343
 344             /* Use "~K" or just "K" if len is 1.  Use "B" for bytes.  */
 345             g_snprintf (buffer, len + 1, (len > 1) ? "~%s" : "%s",
 346                         (j > 1) ? suffix[j - 1] : "B");
 347             break;
 348         }
 349
 350         if (size < power10 [len - (j > 0)]) {
 351             g_snprintf (buffer, len + 1, "%lu%s", (unsigned long) size, suffix[j]);
 352             break;
 353         }
 354
 355         /* Powers of 1024, with rounding.  */
 356         size = (size + 512) >> 10;
 357     }
 358 }
 359
 360 int is_exe (mode_t mode)
 361 {
 362     if ((S_IXUSR & mode) || (S_IXGRP & mode) || (S_IXOTH & mode))
 363         return 1;
 364     return 0;
 365 }
 366
 367 #define ismode(n,m) ((n & m) == m)
 368
 369 const char *
 370 string_perm (mode_t mode_bits)
 371 {
 372     static char mode[11];
 373
 374     strcpy (mode, "----------");
 375     if (S_ISDIR (mode_bits))
 376         mode[0] = 'd';
 377     if (S_ISCHR (mode_bits))
 378         mode[0] = 'c';
 379     if (S_ISBLK (mode_bits))
 380         mode[0] = 'b';
 381     if (S_ISLNK (mode_bits))
 382         mode[0] = 'l';
 383     if (S_ISFIFO (mode_bits))
 384         mode[0] = 'p';
 385     if (S_ISNAM (mode_bits))
 386         mode[0] = 'n';
 387     if (S_ISSOCK (mode_bits))
 388         mode[0] = 's';
 389     if (S_ISDOOR (mode_bits))
 390         mode[0] = 'D';
 391     if (ismode (mode_bits, S_IXOTH))
 392         mode[9] = 'x';
 393     if (ismode (mode_bits, S_IWOTH))
 394         mode[8] = 'w';
 395     if (ismode (mode_bits, S_IROTH))
 396         mode[7] = 'r';
 397     if (ismode (mode_bits, S_IXGRP))
 398         mode[6] = 'x';
 399     if (ismode (mode_bits, S_IWGRP))
 400         mode[5] = 'w';
 401     if (ismode (mode_bits, S_IRGRP))
 402         mode[4] = 'r';
 403     if (ismode (mode_bits, S_IXUSR))
 404         mode[3] = 'x';
 405     if (ismode (mode_bits, S_IWUSR))
 406         mode[2] = 'w';
 407     if (ismode (mode_bits, S_IRUSR))
 408         mode[1] = 'r';
 409 #ifdef S_ISUID
 410     if (ismode (mode_bits, S_ISUID))
 411         mode[3] = (mode[3] == 'x') ? 's' : 'S';
 412 #endif                          /* S_ISUID */
 413 #ifdef S_ISGID
 414     if (ismode (mode_bits, S_ISGID))
 415         mode[6] = (mode[6] == 'x') ? 's' : 'S';
 416 #endif                          /* S_ISGID */
 417 #ifdef S_ISVTX
 418     if (ismode (mode_bits, S_ISVTX))
 419         mode[9] = (mode[9] == 'x') ? 't' : 'T';
 420 #endif                          /* S_ISVTX */
 421     return mode;
 422 }
 423
 424 /* p: string which might contain an url with a password (this parameter is
 425       modified in place).
 426    has_prefix = 0: The first parameter is an url without a prefix
 427                    (user[:pass]@]machine[:port][remote-dir). Delete
 428                    the password.
 429    has_prefix = 1: Search p for known url prefixes. If found delete
 430                    the password from the url.
 431                    Caveat: only the first url is found
 432 */
 433 char *
 434 strip_password (char *p, int has_prefix)
 435 {
 436     static const struct {
 437         const char *name;
 438         size_t len;
 439     } prefixes[] = { {"/#ftp:", 6},
 440                      {"/#mc:", 5},
 441                      {"ftp://", 6},
 442                      {"/#smb:", 6},
 443                      {"/#sh:", 5}
 444     };
 445     char *at, *inner_colon, *dir;
 446     size_t i;
 447     char *result = p;
 448
 449     for (i = 0; i < sizeof (prefixes)/sizeof (prefixes[0]); i++) {
 450         char *q;
 451
 452         if (has_prefix) {
 453             if((q = strstr (p, prefixes[i].name)) == 0)
 454                continue;
 455             else
 456                 p = q + prefixes[i].len;
 457         }
 458
 459         if ((dir = strchr (p, PATH_SEP)) != NULL)
 460             *dir = '\0';
 461
 462         /* search for any possible user */
 463         at = strrchr (p, '@');
 464
 465         if (dir)
 466             *dir = PATH_SEP;
 467
 468         /* We have a username */
 469         if (at) {
 470             inner_colon = memchr (p, ':', at - p);
 471             if (inner_colon)
 472                 memmove (inner_colon, at, strlen(at) + 1);
 473         }
 474         break;
 475     }
 476     return (result);
 477 }
 478
 479 const char *strip_home_and_password(const char *dir)
 480 {
 481     size_t len;
 482     static char newdir [MC_MAXPATHLEN];
 483
 484     if (home_dir && !strncmp (dir, home_dir, len = strlen (home_dir)) &&
 485         (dir[len] == PATH_SEP || dir[len] == '\0')){
 486         newdir [0] = '~';
 487         g_strlcpy (&newdir [1], &dir [len], sizeof(newdir) - 1);
 488         return newdir;
 489     }
 490
 491     /* We do not strip homes in /#ftp tree, I do not like ~'s there
 492        (see ftpfs.c why) */
 493     g_strlcpy (newdir, dir, sizeof(newdir));
 494     strip_password (newdir, 1);
 495     return newdir;
 496 }
 497
 498 static char *maybe_start_group (char *d, int do_group, int *was_wildcard)
 499 {
 500     if (!do_group)
 501         return d;
 502     if (*was_wildcard)
 503         return d;
 504     *was_wildcard = 1;
 505     *d++ = '\\';
 506     *d++ = '(';
 507     return d;
 508 }
 509
 510 static char *maybe_end_group (char *d, int do_group, int *was_wildcard)
 511 {
 512     if (!do_group)
 513         return d;
 514     if (!*was_wildcard)
 515         return d;
 516     *was_wildcard = 0;
 517     *d++ = '\\';
 518     *d++ = ')';
 519     return d;
 520 }
 521
 522 /* If shell patterns are on converts a shell pattern to a regular
 523    expression. Called by regexp_match and mask_rename. */
 524 /* Shouldn't we support [a-fw] type wildcards as well ?? */
 525 char *convert_pattern (const char *pattern, int match_type, int do_group)
 526 {
 527     char *d;
 528     char *new_pattern;
 529     int was_wildcard = 0;
 530     const char *s;
 531
 532     if ((match_type != match_regex) && easy_patterns){
 533         new_pattern = g_malloc (MC_MAXPATHLEN);
 534         d = new_pattern;
 535         if (match_type == match_file)
 536             *d++ = '^';
 537         for (s = pattern; *s; s++, d++){
 538             switch (*s){
 539             case '*':
 540                 d = maybe_start_group (d, do_group, &was_wildcard);
 541                 *d++ = '.';
 542                 *d   = '*';
 543                 break;
 544
 545             case '?':
 546                 d = maybe_start_group (d, do_group, &was_wildcard);
 547                 *d = '.';
 548                 break;
 549
 550             case '.':
 551                 d = maybe_end_group (d, do_group, &was_wildcard);
 552                 *d++ = '\\';
 553                 *d   = '.';
 554                 break;
 555
 556             default:
 557                 d = maybe_end_group (d, do_group, &was_wildcard);
 558                 *d = *s;
 559                 break;
 560             }
 561         }
 562         d = maybe_end_group (d, do_group, &was_wildcard);
 563         if (match_type == match_file)
 564             *d++ = '$';
 565         *d = 0;
 566         return new_pattern;
 567     } else
 568         return  g_strdup (pattern);
 569 }
 570
 571 int regexp_match (const char *pattern, const char *string, int match_type)
 572 {
 573     static regex_t r;
 574     static char *old_pattern = NULL;
 575     static int old_type;
 576     int    rval;
 577     char *my_pattern;
 578
 579     if (!old_pattern || STRCOMP (old_pattern, pattern) || old_type != match_type){
 580         if (old_pattern){
 581             regfree (&r);
 582             g_free (old_pattern);
 583             old_pattern = NULL;
 584         }
 585         my_pattern = convert_pattern (pattern, match_type, 0);
 586         if (regcomp (&r, my_pattern, REG_EXTENDED|REG_NOSUB|MC_ARCH_FLAGS)) {
 587             g_free (my_pattern);
 588             return -1;
 589         }
 590         old_pattern = my_pattern;
 591         old_type = match_type;
 592     }
 593     rval = !regexec (&r, string, 0, NULL, 0);
 594     return rval;
 595 }
 596
 597 const char *extension (const char *filename)
 598 {
 599     const char *d = strrchr (filename, '.');
 600     return (d != NULL) ? d + 1 : "";
 601 }
 602
 603 int get_int (const char *file, const char *key, int def)
 604 {
 605     return GetPrivateProfileInt (app_text, key, def, file);
 606 }
 607
 608 int set_int (const char *file, const char *key, int value)
 609 {
 610     char buffer [BUF_TINY];
 611
 612     g_snprintf (buffer, sizeof (buffer), "%d", value);
 613     return WritePrivateProfileString (app_text, key, buffer, file);
 614 }
 615
 616 int exist_file (const char *name)
 617 {
 618     return access (name, R_OK) == 0;
 619 }
 620
 621 char *load_file (const char *filename)
 622 {
 623     FILE *data_file;
 624     struct stat s;
 625     char *data;
 626     long read_size;
 627
 628     if ((data_file = fopen (filename, "r")) == NULL){
 629         return 0;
 630     }
 631     if (fstat (fileno (data_file), &s) != 0){
 632         fclose (data_file);
 633         return 0;
 634     }
 635     data = g_malloc (s.st_size+1);
 636     read_size = fread (data, 1, s.st_size, data_file);
 637     data [read_size] = 0;
 638     fclose (data_file);
 639
 640     if (read_size > 0)
 641         return data;
 642     else {
 643          g_free (data);
 644         return 0;
 645     }
 646 }
 647
 648 char *
 649 load_mc_home_file (const char *filename, char **allocated_filename)
 650 {
 651     char *hintfile_base, *hintfile;
 652     char *lang;
 653     char *data;
 654
 655     hintfile_base = concat_dir_and_file (mc_home, filename);
 656     lang = guess_message_value ();
 657
 658     hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 659     data = load_file (hintfile);
 660
 661     if (!data) {
 662         g_free (hintfile);
 663         /* Fall back to the two-letter language code */
 664         if (lang[0] && lang[1])
 665             lang[2] = 0;
 666         hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 667         data = load_file (hintfile);
 668
 669         if (!data) {
 670             g_free (hintfile);
 671             hintfile = hintfile_base;
 672             data = load_file (hintfile_base);
 673         }
 674     }
 675
 676     g_free (lang);
 677
 678     if (hintfile != hintfile_base)
 679         g_free (hintfile_base);
 680
 681     if (allocated_filename)
 682         *allocated_filename = hintfile;
 683     else
 684         g_free (hintfile);
 685
 686     return data;
 687 }
 688
 689 /* Check strftime() results. Some systems (i.e. Solaris) have different
 690 short-month-name sizes for different locales */
 691 size_t i18n_checktimelength (void)
 692 {
 693     size_t length, a, b;
 694     char buf [MAX_I18NTIMELENGTH + 1];
 695     time_t testtime = time (NULL);
 696
 697     a = strftime (buf, sizeof(buf)-1, _("%b %e %H:%M"), localtime(&testtime));
 698     b = strftime (buf, sizeof(buf)-1, _("%b %e  %Y"), localtime(&testtime));
 699
 700     length = max (a, b);
 701
 702     /* Don't handle big differences. Use standard value (email bug, please) */
 703     if ( length > MAX_I18NTIMELENGTH || length < MIN_I18NTIMELENGTH )
 704         length = STD_I18NTIMELENGTH;
 705
 706     return length;
 707 }
 708
 709 const char *file_date (time_t when)
 710 {
 711     static char timebuf [MAX_I18NTIMELENGTH + 1];
 712     time_t current_time = time ((time_t) 0);
 713     static size_t i18n_timelength = 0;
 714     static const char *fmtyear, *fmttime;
 715     const char *fmt;
 716
 717     if (i18n_timelength == 0){
 718         i18n_timelength = i18n_checktimelength() + 1;
 719
 720         /* strftime() format string for old dates */
 721         fmtyear = _("%b %e  %Y");
 722         /* strftime() format string for recent dates */
 723         fmttime = _("%b %e %H:%M");
 724     }
 725
 726     if (current_time > when + 6L * 30L * 24L * 60L * 60L /* Old. */
 727         || current_time < when - 60L * 60L) /* In the future. */
 728         /* The file is fairly old or in the future.
 729            POSIX says the cutoff is 6 months old;
 730            approximate this by 6*30 days.
 731            Allow a 1 hour slop factor for what is considered "the future",
 732            to allow for NFS server/client clock disagreement.
 733            Show the year instead of the time of day.  */
 734
 735         fmt = fmtyear;
 736     else
 737         fmt = fmttime;
 738
 739     strftime (timebuf, i18n_timelength, fmt, localtime(&when));
 740     return timebuf;
 741 }
 742
 743 const char *extract_line (const char *s, const char *top)
 744 {
 745     static char tmp_line [BUF_MEDIUM];
 746     char *t = tmp_line;
 747
 748     while (*s && *s != '\n' && (size_t) (t - tmp_line) < sizeof (tmp_line)-1 && s < top)
 749         *t++ = *s++;
 750     *t = 0;
 751     return tmp_line;
 752 }
 753
 754 /* FIXME: I should write a faster version of this (Aho-Corasick stuff) */
 755 const char * _icase_search (const char *text, const char *data, int *lng)
 756 {
 757     const char *d = text;
 758     const char *e = data;
 759     int dlng = 0;
 760
 761     if (lng)
 762         *lng = 0;
 763     for (;*e; e++) {
 764         while (*(e+1) == '\b' && *(e+2)) {
 765             e += 2;
 766             dlng += 2;
 767         }
 768         if (toupper((unsigned char) *d) == toupper((unsigned char) *e))
 769             d++;
 770         else {
 771             e -= d - text;
 772             d = text;
 773             dlng = 0;
 774         }
 775         if (!*d) {
 776             if (lng)
 777                 *lng = strlen (text) + dlng;
 778             return e+1;
 779         }
 780     }
 781     return 0;
 782 }
 783
 784 /* The basename routine */
 785 const char *x_basename (const char *s)
 786 {
 787     const char  *where;
 788     return ((where = strrchr (s, PATH_SEP))) ? where + 1 : s;
 789 }
 790
 791
 792 const char *unix_error_string (int error_num)
 793 {
 794     static char buffer [BUF_LARGE];
 795 #if GLIB_MAJOR_VERSION >= 2
 796     gchar *strerror_currentlocale;
 797
 798     strerror_currentlocale = g_locale_from_utf8(g_strerror (error_num), -1, NULL, NULL, NULL);
 799     g_snprintf (buffer, sizeof (buffer), "%s (%d)",
 800                 strerror_currentlocale, error_num);
 801     g_free(strerror_currentlocale);
 802 #else
 803     g_snprintf (buffer, sizeof (buffer), "%s (%d)",
 804                 g_strerror (error_num), error_num);
 805 #endif
 806     return buffer;
 807 }
 808
 809 const char *skip_separators (const char *s)
 810 {
 811     for (;*s; s++)
 812         if (*s != ' ' && *s != '\t' && *s != ',')
 813             break;
 814     return s;
 815 }
 816
 817 const char *skip_numbers (const char *s)
 818 {
 819     for (;*s; s++)
 820         if (!isdigit ((int) (unsigned char) *s))
 821             break;
 822     return s;
 823 }
 824
 825 /* Remove all control sequences from the argument string.  We define
 826  * "control sequence", in a sort of pidgin BNF, as follows:
 827  *
 828  * control-seq = Esc non-'['
 829  *             | Esc '[' (0 or more digits or ';' or '?') (any other char)
 830  *
 831  * This scheme works for all the terminals described in my termcap /
 832  * terminfo databases, except the Hewlett-Packard 70092 and some Wyse
 833  * terminals.  If I hear from a single person who uses such a terminal
 834  * with MC, I'll be glad to add support for it.  (Dugan)
 835  * Non-printable characters are also removed.
 836  */
 837
 838 char *strip_ctrl_codes (char *s)
 839 {
 840     char *w; /* Current position where the stripped data is written */
 841     char *r; /* Current position where the original data is read */
 842
 843     if (!s)
 844         return 0;
 845
 846     for (w = s, r = s; *r; ) {
 847         if (*r == ESC_CHAR) {
 848             /* Skip the control sequence's arguments */ ;
 849             if (*(++r) == '[') {
 850                 /* strchr() matches trailing binary 0 */
 851                 while (*(++r) && strchr ("0123456789;?", *r));
 852             }
 853
 854             /*
 855              * Now we are at the last character of the sequence.
 856              * Skip it unless it's binary 0.
 857              */
 858             if (*r)
 859                 r++;
 860             continue;
 861         }
 862
 863         if (is_printable(*r))
 864             *w++ = *r;
 865         ++r;
 866     }
 867     *w = 0;
 868     return s;
 869 }
 870
 871
 872 #ifndef USE_VFS
 873 char *get_current_wd (char *buffer, int size)
 874 {
 875     char *p;
 876     int len;
 877
 878     p = g_get_current_dir ();
 879     len = strlen(p) + 1;
 880
 881     if (len > size) {
 882         g_free (p);
 883         return NULL;
 884     }
 885
 886     memcpy (buffer, p, len);
 887     g_free (p);
 888
 889     return buffer;
 890 }
 891 #endif /* !USE_VFS */
 892
 893 /* This function returns 0 if the file is not in not compressed by
 894  * one of the supported compressors (gzip, bzip, bzip2).  Otherwise,
 895  * the compression type is returned, as defined in util.h
 896  * Warning: this function moves the current file pointer */
 897 int get_compression_type (int fd)
 898 {
 899     unsigned char magic[4];
 900
 901     /* Read the magic signature */
 902     if (mc_read (fd, (char *) magic, 4) != 4)
 903         return COMPRESSION_NONE;
 904
 905     /* GZIP_MAGIC and OLD_GZIP_MAGIC */
 906     if (magic[0] == 037 && (magic[1] == 0213 || magic[1] == 0236)) {
 907         return COMPRESSION_GZIP;
 908     }
 909
 910     /* PKZIP_MAGIC */
 911     if (magic[0] == 0120 && magic[1] == 0113 && magic[2] == 003
 912         && magic[3] == 004) {
 913         /* Read compression type */
 914         mc_lseek (fd, 8, SEEK_SET);
 915         if (mc_read (fd, (char *) magic, 2) != 2)
 916             return COMPRESSION_NONE;
 917
 918         /* Gzip can handle only deflated (8) or stored (0) files */
 919         if ((magic[0] != 8 && magic[0] != 0) || magic[1] != 0)
 920             return COMPRESSION_NONE;
 921
 922         /* Compatible with gzip */
 923         return COMPRESSION_GZIP;
 924     }
 925
 926     /* PACK_MAGIC and LZH_MAGIC and compress magic */
 927     if (magic[0] == 037
 928         && (magic[1] == 036 || magic[1] == 0240 || magic[1] == 0235)) {
 929         /* Compatible with gzip */
 930         return COMPRESSION_GZIP;
 931     }
 932
 933     /* BZIP and BZIP2 files */
 934     if ((magic[0] == 'B') && (magic[1] == 'Z') &&
 935         (magic[3] >= '1') && (magic[3] <= '9')) {
 936         switch (magic[2]) {
 937         case '0':
 938             return COMPRESSION_BZIP;
 939         case 'h':
 940             return COMPRESSION_BZIP2;
 941         }
 942     }
 943     return 0;
 944 }
 945
 946 const char *
 947 decompress_extension (int type)
 948 {
 949         switch (type){
 950         case COMPRESSION_GZIP: return "#ugz";
 951         case COMPRESSION_BZIP:   return "#ubz";
 952         case COMPRESSION_BZIP2:  return "#ubz2";
 953         }
 954         /* Should never reach this place */
 955         fprintf (stderr, "Fatal: decompress_extension called with an unknown argument\n");
 956         return 0;
 957 }
 958
 959 /* Hooks */
 960 void add_hook (Hook **hook_list, void (*hook_fn)(void *), void *data)
 961 {
 962     Hook *new_hook = g_new (Hook, 1);
 963
 964     new_hook->hook_fn = hook_fn;
 965     new_hook->next    = *hook_list;
 966     new_hook->hook_data = data;
 967
 968     *hook_list = new_hook;
 969 }
 970
 971 void execute_hooks (Hook *hook_list)
 972 {
 973     Hook *new_hook = 0;
 974     Hook *p;
 975
 976     /* We copy the hook list first so tahat we let the hook
 977      * function call delete_hook
 978      */
 979
 980     while (hook_list){
 981         add_hook (&new_hook, hook_list->hook_fn, hook_list->hook_data);
 982         hook_list = hook_list->next;
 983     }
 984     p = new_hook;
 985
 986     while (new_hook){
 987         (*new_hook->hook_fn)(new_hook->hook_data);
 988         new_hook = new_hook->next;
 989     }
 990
 991     for (hook_list = p; hook_list;){
 992         p = hook_list;
 993         hook_list = hook_list->next;
 994          g_free (p);
 995     }
 996 }
 997
 998 void delete_hook (Hook **hook_list, void (*hook_fn)(void *))
 999 {
1000     Hook *current, *new_list, *next;
1001
1002     new_list = 0;
1003
1004     for (current = *hook_list; current; current = next){
1005         next = current->next;
1006         if (current->hook_fn == hook_fn)
1007             g_free (current);
1008         else
1009             add_hook (&new_list, current->hook_fn, current->hook_data);
1010     }
1011     *hook_list = new_list;
1012 }
1013
1014 int hook_present (Hook *hook_list, void (*hook_fn)(void *))
1015 {
1016     Hook *p;
1017
1018     for (p = hook_list; p; p = p->next)
1019         if (p->hook_fn == hook_fn)
1020             return 1;
1021     return 0;
1022 }
1023
1024 void wipe_password (char *passwd)
1025 {
1026     char *p = passwd;
1027
1028     if (!p)
1029         return;
1030     for (;*p ; p++)
1031         *p = 0;
1032     g_free (passwd);
1033 }
1034
1035 /* Convert "\E" -> esc character and ^x to control-x key and ^^ to ^ key */
1036 /* Returns a newly allocated string */
1037 char *convert_controls (const char *p)
1038 {
1039     char *valcopy = g_strdup (p);
1040     char *q;
1041
1042     /* Parse the escape special character */
1043     for (q = valcopy; *p;){
1044         if (*p == '\\'){
1045             p++;
1046             if ((*p == 'e') || (*p == 'E')){
1047                 p++;
1048                 *q++ = ESC_CHAR;
1049             }
1050         } else {
1051             if (*p == '^'){
1052                 p++;
1053                 if (*p == '^')
1054                     *q++ = *p++;
1055                 else {
1056                     char c = (*p | 0x20);
1057                     if (c >= 'a' && c <= 'z') {
1058                         *q++ = c - 'a' + 1;
1059                         p++;
1060                     } else if (*p)
1061                         p++;
1062                 }
1063             } else
1064                 *q++ = *p++;
1065         }
1066     }
1067     *q = 0;
1068     return valcopy;
1069 }
1070
1071 static char *resolve_symlinks (const char *path)
1072 {
1073     char *buf, *buf2, *q, *r, c;
1074     int len;
1075     struct stat mybuf;
1076     const char *p;
1077
1078     if (*path != PATH_SEP)
1079         return NULL;
1080     r = buf = g_malloc (MC_MAXPATHLEN);
1081     buf2 = g_malloc (MC_MAXPATHLEN);
1082     *r++ = PATH_SEP;
1083     *r = 0;
1084     p = path;
1085     for (;;) {
1086         q = strchr (p + 1, PATH_SEP);
1087         if (!q) {
1088             q = strchr (p + 1, 0);
1089             if (q == p + 1)
1090                 break;
1091         }
1092         c = *q;
1093         *q = 0;
1094         if (mc_lstat (path, &mybuf) < 0) {
1095             g_free (buf);
1096             g_free (buf2);
1097             *q = c;
1098             return NULL;
1099         }
1100         if (!S_ISLNK (mybuf.st_mode))
1101             strcpy (r, p + 1);
1102         else {
1103             len = mc_readlink (path, buf2, MC_MAXPATHLEN - 1);
1104             if (len < 0) {
1105                  g_free (buf);
1106                  g_free (buf2);
1107                 *q = c;
1108                 return NULL;
1109             }
1110             buf2 [len] = 0;
1111             if (*buf2 == PATH_SEP)
1112                 strcpy (buf, buf2);
1113             else
1114                 strcpy (r, buf2);
1115         }
1116         canonicalize_pathname (buf);
1117         r = strchr (buf, 0);
1118         if (!*r || *(r - 1) != PATH_SEP) {
1119             *r++ = PATH_SEP;
1120             *r = 0;
1121         }
1122         *q = c;
1123         p = q;
1124         if (!c)
1125             break;
1126     }
1127     if (!*buf)
1128         strcpy (buf, PATH_SEP_STR);
1129     else if (*(r - 1) == PATH_SEP && r != buf + 1)
1130         *(r - 1) = 0;
1131     g_free (buf2);
1132     return buf;
1133 }
1134
1135 /* Finds out a relative path from first to second, i.e. goes as many ..
1136  * as needed up in first and then goes down using second */
1137 char *diff_two_paths (const char *first, const char *second)
1138 {
1139     char *p, *q, *r, *s, *buf = 0;
1140     int i, j, prevlen = -1, currlen;
1141     char *my_first = NULL, *my_second = NULL;
1142
1143     my_first = resolve_symlinks (first);
1144     if (my_first == NULL)
1145         return NULL;
1146     for (j = 0; j < 2; j++) {
1147         p = my_first;
1148         if (j) {
1149             my_second = resolve_symlinks (second);
1150             if (my_second == NULL) {
1151                 g_free (my_first);
1152                 return buf;
1153             }
1154         }
1155         q = my_second;
1156         for (;;) {
1157             r = strchr (p, PATH_SEP);
1158             s = strchr (q, PATH_SEP);
1159             if (!r || !s)
1160               break;
1161             *r = 0; *s = 0;
1162             if (strcmp (p, q)) {
1163                 *r = PATH_SEP; *s = PATH_SEP;
1164                 break;
1165             } else {
1166                 *r = PATH_SEP; *s = PATH_SEP;
1167             }
1168             p = r + 1;
1169             q = s + 1;
1170         }
1171         p--;
1172         for (i = 0; (p = strchr (p + 1, PATH_SEP)) != NULL; i++);
1173         currlen = (i + 1) * 3 + strlen (q) + 1;
1174         if (j) {
1175             if (currlen < prevlen)
1176                 g_free (buf);
1177             else {
1178                  g_free (my_first);
1179                  g_free (my_second);
1180                 return buf;
1181             }
1182         }
1183         p = buf = g_malloc (currlen);
1184         prevlen = currlen;
1185         for (; i >= 0; i--, p += 3)
1186           strcpy (p, "../");
1187         strcpy (p, q);
1188     }
1189     g_free (my_first);
1190     g_free (my_second);
1191     return buf;
1192 }
1193
1194 /* If filename is NULL, then we just append PATH_SEP to the dir */
1195 char *
1196 concat_dir_and_file (const char *dir, const char *file)
1197 {
1198     int i = strlen (dir);
1199
1200     if (dir [i-1] == PATH_SEP)
1201         return  g_strconcat (dir, file, (char *) NULL);
1202     else
1203         return  g_strconcat (dir, PATH_SEP_STR, file, (char *) NULL);
1204 }
1205
1206
1207 /* Append text to GList, remove all entries with the same text */
1208 GList *
1209 list_append_unique (GList *list, char *text)
1210 {
1211     GList *link, *newlink;
1212
1213     /*
1214      * Go to the last position and traverse the list backwards
1215      * starting from the second last entry to make sure that we
1216      * are not removing the current link.
1217      */
1218     list = g_list_append (list, text);
1219     list = g_list_last (list);
1220     link = g_list_previous (list);
1221
1222     while (link) {
1223         newlink = g_list_previous (link);
1224         if (!strcmp ((char *) link->data, text)) {
1225             g_free (link->data);
1226             g_list_remove_link (list, link);
1227             g_list_free_1 (link);
1228         }
1229         link = newlink;
1230     }
1231
1232     return list;
1233 }
1234
1235
1236 /* Following code heavily borrows from libiberty, mkstemps.c */
1237
1238 /* Number of attempts to create a temporary file */
1239 #ifndef TMP_MAX
1240 #define TMP_MAX 16384
1241 #endif /* !TMP_MAX */
1242
1243 /*
1244  * Arguments:
1245  * pname (output) - pointer to the name of the temp file (needs g_free).
1246  *                  NULL if the function fails.
1247  * prefix - part of the filename before the random part.
1248  *          Prepend $TMPDIR or /tmp if there are no path separators.
1249  * suffix - if not NULL, part of the filename after the random part.
1250  *
1251  * Result:
1252  * handle of the open file or -1 if couldn't open any.
1253  */
1254 int
1255 mc_mkstemps (char **pname, const char *prefix, const char *suffix)
1256 {
1257     static const char letters[]
1258         = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
1259     static unsigned long value;
1260     struct timeval tv;
1261     char *tmpbase;
1262     char *tmpname;
1263     char *XXXXXX;
1264     int count;
1265
1266     if (strchr (prefix, PATH_SEP) == NULL) {
1267         /* Add prefix first to find the position of XXXXXX */
1268         tmpbase = concat_dir_and_file (mc_tmpdir (), prefix);
1269     } else {
1270         tmpbase = g_strdup (prefix);
1271     }
1272
1273     tmpname = g_strconcat (tmpbase, "XXXXXX", suffix, (char *) NULL);
1274     *pname = tmpname;
1275     XXXXXX = &tmpname[strlen (tmpbase)];
1276     g_free (tmpbase);
1277
1278     /* Get some more or less random data.  */
1279     gettimeofday (&tv, NULL);
1280     value += (tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
1281
1282     for (count = 0; count < TMP_MAX; ++count) {
1283         unsigned long v = value;
1284         int fd;
1285
1286         /* Fill in the random bits.  */
1287         XXXXXX[0] = letters[v % 62];
1288         v /= 62;
1289         XXXXXX[1] = letters[v % 62];
1290         v /= 62;
1291         XXXXXX[2] = letters[v % 62];
1292         v /= 62;
1293         XXXXXX[3] = letters[v % 62];
1294         v /= 62;
1295         XXXXXX[4] = letters[v % 62];
1296         v /= 62;
1297         XXXXXX[5] = letters[v % 62];
1298
1299         fd = open (tmpname, O_RDWR | O_CREAT | O_TRUNC | O_EXCL,
1300                    S_IRUSR | S_IWUSR);
1301         if (fd >= 0) {
1302             /* Successfully created.  */
1303             return fd;
1304         }
1305
1306         /* This is a random value.  It is only necessary that the next
1307            TMP_MAX values generated by adding 7777 to VALUE are different
1308            with (module 2^32).  */
1309         value += 7777;
1310     }
1311
1312     /* Unsuccessful. Free the filename. */
1313     g_free (tmpname);
1314     *pname = NULL;
1315
1316     return -1;
1317 }
1318
1319
1320 /*
1321  * Read and restore position for the given filename.
1322  * If there is no stored data, return line 1 and col 0.
1323  */
1324 void
1325 load_file_position (const char *filename, long *line, long *column)
1326 {
1327     char *fn;
1328     FILE *f;
1329     char buf[MC_MAXPATHLEN + 20];
1330     int len;
1331
1332     /* defaults */
1333     *line = 1;
1334     *column = 0;
1335
1336     /* open file with positions */
1337     fn = concat_dir_and_file (home_dir, MC_FILEPOS);
1338     f = fopen (fn, "r");
1339     g_free (fn);
1340     if (!f)
1341         return;
1342
1343     len = strlen (filename);
1344
1345     while (fgets (buf, sizeof (buf), f)) {
1346         const char *p;
1347
1348         /* check if the filename matches the beginning of string */
1349         if (strncmp (buf, filename, len) != 0)
1350             continue;
1351
1352         /* followed by single space */
1353         if (buf[len] != ' ')
1354             continue;
1355
1356         /* and string without spaces */
1357         p = &buf[len + 1];
1358         if (strchr (p, ' '))
1359             continue;
1360
1361         *line = strtol(p, const_cast(char **, &p), 10);
1362         if (*p == ';') {
1363             *column = strtol(p, const_cast(char **, &p), 10);
1364             if (*p != '\n')
1365                 *column = 0;
1366         } else
1367             *line = 1;
1368     }
1369     fclose (f);
1370 }
1371
1372 /* Save position for the given file */
1373 void
1374 save_file_position (const char *filename, long line, long column)
1375 {
1376     char *tmp, *fn;
1377     FILE *f, *t;
1378     char buf[MC_MAXPATHLEN + 20];
1379     int i = 1;
1380     int len;
1381
1382     len = strlen (filename);
1383
1384     tmp = concat_dir_and_file (home_dir, MC_FILEPOS_TMP);
1385     fn = concat_dir_and_file (home_dir, MC_FILEPOS);
1386
1387     /* open temporary file */
1388     t = fopen (tmp, "w");
1389     if (!t) {
1390         g_free (tmp);
1391         g_free (fn);
1392         return;
1393     }
1394
1395     /* put the new record */
1396     fprintf (t, "%s %ld;%ld\n", filename, line, column);
1397
1398     /* copy records from the old file */
1399     f = fopen (fn, "r");
1400     if (f) {
1401         while (fgets (buf, sizeof (buf), f)) {
1402             /* Skip entries for the current filename */
1403             if (strncmp (buf, filename, len) == 0 && buf[len] == ' '
1404                 && !strchr (&buf[len + 1], ' '))
1405                 continue;
1406
1407             fprintf (t, "%s", buf);
1408             if (++i > MC_FILEPOS_ENTRIES)
1409                 break;
1410         }
1411         fclose (f);
1412     }
1413
1414     fclose (t);
1415     rename (tmp, fn);
1416     g_free (tmp);
1417     g_free (fn);
1418 }
1419
1420 extern const char *
1421 cstrcasestr (const char *haystack, const char *needle)
1422 {
1423     const unsigned char *uhaystack = (const unsigned char *) haystack;
1424     const unsigned char *uneedle = (const unsigned char *) needle;
1425     const unsigned char *hptr;
1426     size_t i, needle_len;
1427
1428     needle_len = strlen(needle);
1429     for (hptr = uhaystack; *hptr != '\0'; hptr++) {
1430         for (i = 0; i < needle_len; i++) {
1431             if (toupper(hptr[i]) != toupper(uneedle[i]))
1432                 goto next_try;
1433         }
1434         return hptr;
1435     next_try:
1436         (void) 0;
1437     }
1438     return NULL;
1439 }