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