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         { "/#mc:", 5 },
 493         { "mc://", 5 },
 494         { "/#smb:", 6 },
 495         { "smb://", 6 },
 496         { "/#sh:", 5 },
 497         { "sh://", 5 },
 498         { "ssh://", 6 }
 499         /* *INDENT-ON* */
 500     };
 501
 502     char *at, *inner_colon, *dir;
 503     size_t i;
 504     char *result = p;
 505
 506     for (i = 0; i < sizeof (prefixes) / sizeof (prefixes[0]); i++)
 507     {
 508         char *q;
 509
 510         if (has_prefix)
 511         {
 512             q = strstr (p, prefixes[i].name);
 513             if (q == NULL)
 514                 continue;
 515             else
 516                 p = q + prefixes[i].len;
 517         }
 518
 519         dir = strchr (p, PATH_SEP);
 520         if (dir != NULL)
 521             *dir = '\0';
 522
 523         /* search for any possible user */
 524         at = strrchr (p, '@');
 525
 526         if (dir)
 527             *dir = PATH_SEP;
 528
 529         /* We have a username */
 530         if (at)
 531         {
 532             inner_colon = memchr (p, ':', at - p);
 533             if (inner_colon)
 534                 memmove (inner_colon, at, strlen (at) + 1);
 535         }
 536         break;
 537     }
 538     return (result);
 539 }
 540
 541 const char *
 542 strip_home_and_password (const char *dir)
 543 {
 544     size_t len;
 545     static char newdir[MC_MAXPATHLEN];
 546
 547     len = strlen (home_dir);
 548     if (home_dir != NULL && strncmp (dir, home_dir, len) == 0 &&
 549         (dir[len] == PATH_SEP || dir[len] == '\0'))
 550     {
 551         newdir[0] = '~';
 552         g_strlcpy (&newdir[1], &dir[len], sizeof (newdir) - 1);
 553         return newdir;
 554     }
 555
 556     /* We do not strip homes in /#ftp tree, I do not like ~'s there
 557        (see ftpfs.c why) */
 558     g_strlcpy (newdir, dir, sizeof (newdir));
 559     strip_password (newdir, 1);
 560     return newdir;
 561 }
 562
 563 const char *
 564 extension (const char *filename)
 565 {
 566     const char *d = strrchr (filename, '.');
 567     return (d != NULL) ? d + 1 : "";
 568 }
 569
 570 int
 571 exist_file (const char *name)
 572 {
 573     return access (name, R_OK) == 0;
 574 }
 575
 576 int
 577 check_for_default (const char *default_file, const char *file)
 578 {
 579     if (!exist_file (file))
 580     {
 581         FileOpContext *ctx;
 582         FileOpTotalContext *tctx;
 583
 584         if (!exist_file (default_file))
 585             return -1;
 586
 587         ctx = file_op_context_new (OP_COPY);
 588         tctx = file_op_total_context_new ();
 589         file_op_context_create_ui (ctx, 0, FALSE);
 590         copy_file_file (tctx, ctx, default_file, file);
 591         file_op_total_context_destroy (tctx);
 592         file_op_context_destroy (ctx);
 593     }
 594
 595     return 0;
 596 }
 597
 598
 599
 600 char *
 601 load_file (const char *filename)
 602 {
 603     FILE *data_file;
 604     struct stat s;
 605     char *data;
 606     long read_size;
 607
 608     data_file = fopen (filename, "r");
 609     if (data_file == NULL)
 610     {
 611         return 0;
 612     }
 613     if (fstat (fileno (data_file), &s) != 0)
 614     {
 615         fclose (data_file);
 616         return 0;
 617     }
 618     data = g_malloc (s.st_size + 1);
 619     read_size = fread (data, 1, s.st_size, data_file);
 620     data[read_size] = 0;
 621     fclose (data_file);
 622
 623     if (read_size > 0)
 624         return data;
 625     else
 626     {
 627         g_free (data);
 628         return 0;
 629     }
 630 }
 631
 632 char *
 633 load_mc_home_file (const char *_mc_home, const char *_mc_home_alt, const char *filename,
 634                    char **allocated_filename)
 635 {
 636     char *hintfile_base, *hintfile;
 637     char *lang;
 638     char *data;
 639
 640     hintfile_base = concat_dir_and_file (_mc_home, filename);
 641     lang = guess_message_value ();
 642
 643     hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 644     data = load_file (hintfile);
 645
 646     if (!data)
 647     {
 648         g_free (hintfile);
 649         g_free (hintfile_base);
 650         hintfile_base = concat_dir_and_file (_mc_home_alt, filename);
 651
 652         hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 653         data = load_file (hintfile);
 654
 655         if (!data)
 656         {
 657             /* Fall back to the two-letter language code */
 658             if (lang[0] && lang[1])
 659                 lang[2] = 0;
 660             g_free (hintfile);
 661             hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 662             data = load_file (hintfile);
 663
 664             if (!data)
 665             {
 666                 g_free (hintfile);
 667                 hintfile = hintfile_base;
 668                 data = load_file (hintfile_base);
 669             }
 670         }
 671     }
 672
 673     g_free (lang);
 674
 675     if (hintfile != hintfile_base)
 676         g_free (hintfile_base);
 677
 678     if (allocated_filename)
 679         *allocated_filename = hintfile;
 680     else
 681         g_free (hintfile);
 682
 683     return data;
 684 }
 685
 686 /* Check strftime() results. Some systems (i.e. Solaris) have different
 687    short-month and month name sizes for different locales */
 688 size_t
 689 i18n_checktimelength (void)
 690 {
 691     size_t length = 0;
 692     const time_t testtime = time (NULL);
 693     struct tm *lt = localtime (&testtime);
 694
 695     if (i18n_timelength_cache <= MAX_I18NTIMELENGTH)
 696         return i18n_timelength_cache;
 697
 698     if (lt == NULL)
 699     {
 700         /* huh, localtime() doesnt seem to work ... falling back to "(invalid)" */
 701         length = str_term_width1 (_(INVALID_TIME_TEXT));
 702     }
 703     else
 704     {
 705         char buf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1];
 706
 707         /* We are interested in the longest possible date */
 708         lt->tm_sec = lt->tm_min = lt->tm_hour = lt->tm_mday = 10;
 709
 710         /* Loop through all months to find out the longest one */
 711         for (lt->tm_mon = 0; lt->tm_mon < 12; lt->tm_mon++) {
 712             strftime (buf, sizeof(buf) - 1, user_recent_timeformat, lt);
 713             length = max ((size_t) str_term_width1 (buf), length);
 714             strftime (buf, sizeof(buf) - 1, user_old_timeformat, lt);
 715             length = max ((size_t) str_term_width1 (buf), length);
 716         }
 717
 718         length = max ((size_t) str_term_width1 (_(INVALID_TIME_TEXT)), length);
 719     }
 720
 721     /* Don't handle big differences. Use standard value (email bug, please) */
 722     if (length > MAX_I18NTIMELENGTH || length < MIN_I18NTIMELENGTH)
 723         length = STD_I18NTIMELENGTH;
 724
 725     /* Save obtained value to the cache */
 726     i18n_timelength_cache = length;
 727
 728     return i18n_timelength_cache;
 729 }
 730
 731 const char *
 732 file_date (time_t when)
 733 {
 734     static char timebuf[MB_LEN_MAX * MAX_I18NTIMELENGTH + 1];
 735     time_t current_time = time ((time_t) 0);
 736     const char *fmt;
 737
 738     if (current_time > when + 6L * 30L * 24L * 60L * 60L        /* Old. */
 739         || current_time < when - 60L * 60L)     /* In the future. */
 740         /* The file is fairly old or in the future.
 741            POSIX says the cutoff is 6 months old;
 742            approximate this by 6*30 days.
 743            Allow a 1 hour slop factor for what is considered "the future",
 744            to allow for NFS server/client clock disagreement.
 745            Show the year instead of the time of day.  */
 746
 747         fmt = user_old_timeformat;
 748     else
 749         fmt = user_recent_timeformat;
 750
 751     FMT_LOCALTIME (timebuf, sizeof (timebuf), fmt, when);
 752
 753     return timebuf;
 754 }
 755
 756 const char *
 757 extract_line (const char *s, const char *top)
 758 {
 759     static char tmp_line[BUF_MEDIUM];
 760     char *t = tmp_line;
 761
 762     while (*s && *s != '\n' && (size_t) (t - tmp_line) < sizeof (tmp_line) - 1 && s < top)
 763         *t++ = *s++;
 764     *t = 0;
 765     return tmp_line;
 766 }
 767
 768 /* The basename routine */
 769 const char *
 770 x_basename (const char *s)
 771 {
 772     const char *where;
 773     return ((where = strrchr (s, PATH_SEP))) ? where + 1 : s;
 774 }
 775
 776
 777 const char *
 778 unix_error_string (int error_num)
 779 {
 780     static char buffer[BUF_LARGE];
 781     gchar *strerror_currentlocale;
 782
 783     strerror_currentlocale = g_locale_from_utf8 (g_strerror (error_num), -1, NULL, NULL, NULL);
 784     g_snprintf (buffer, sizeof (buffer), "%s (%d)", strerror_currentlocale, error_num);
 785     g_free (strerror_currentlocale);
 786
 787     return buffer;
 788 }
 789
 790 const char *
 791 skip_separators (const char *s)
 792 {
 793     const char *su = s;
 794
 795     for (; *su; str_cnext_char (&su))
 796         if (*su != ' ' && *su != '\t' && *su != ',')
 797             break;
 798
 799     return su;
 800 }
 801
 802 const char *
 803 skip_numbers (const char *s)
 804 {
 805     const char *su = s;
 806
 807     for (; *su; str_cnext_char (&su))
 808         if (!str_isdigit (su))
 809             break;
 810
 811     return su;
 812 }
 813
 814 /* Remove all control sequences from the argument string.  We define
 815  * "control sequence", in a sort of pidgin BNF, as follows:
 816  *
 817  * control-seq = Esc non-'['
 818  *             | Esc '[' (0 or more digits or ';' or '?') (any other char)
 819  *
 820  * This scheme works for all the terminals described in my termcap /
 821  * terminfo databases, except the Hewlett-Packard 70092 and some Wyse
 822  * terminals.  If I hear from a single person who uses such a terminal
 823  * with MC, I'll be glad to add support for it.  (Dugan)
 824  * Non-printable characters are also removed.
 825  */
 826
 827 char *
 828 strip_ctrl_codes (char *s)
 829 {
 830     char *w;                    /* Current position where the stripped data is written */
 831     char *r;                    /* Current position where the original data is read */
 832     char *n;
 833
 834     if (!s)
 835         return 0;
 836
 837     for (w = s, r = s; *r;)
 838     {
 839         if (*r == ESC_CHAR)
 840         {
 841             /* Skip the control sequence's arguments */ ;
 842             /* '(' need to avoid strange 'B' letter in *Suse (if mc runs under root user) */
 843             if (*(++r) == '[' || *r == '(')
 844             {
 845                 /* strchr() matches trailing binary 0 */
 846                 while (*(++r) && strchr ("0123456789;?", *r));
 847             }
 848             else if (*r == ']')
 849             {
 850                 /*
 851                  * Skip xterm's OSC (Operating System Command)
 852                  * http://www.xfree86.org/current/ctlseqs.html
 853                  * OSC P s ; P t ST
 854                  * OSC P s ; P t BEL
 855                  */
 856                 char *new_r = r;
 857
 858                 for (; *new_r; ++new_r)
 859                 {
 860                     switch (*new_r)
 861                     {
 862                         /* BEL */
 863                     case '\a':
 864                         r = new_r;
 865                         goto osc_out;
 866                     case ESC_CHAR:
 867                         /* ST */
 868                         if (*(new_r + 1) == '\\')
 869                         {
 870                             r = new_r + 1;
 871                             goto osc_out;
 872                         }
 873                     }
 874                 }
 875               osc_out:;
 876             }
 877
 878             /*
 879              * Now we are at the last character of the sequence.
 880              * Skip it unless it's binary 0.
 881              */
 882             if (*r)
 883                 r++;
 884             continue;
 885         }
 886
 887         n = str_get_next_char (r);
 888         if (str_isprint (r))
 889         {
 890             memmove (w, r, n - r);
 891             w += n - r;
 892         }
 893         r = n;
 894     }
 895     *w = 0;
 896     return s;
 897 }
 898
 899
 900 #ifndef ENABLE_VFS
 901 char *
 902 get_current_wd (char *buffer, int size)
 903 {
 904     char *p;
 905     int len;
 906
 907     p = g_get_current_dir ();
 908     len = strlen (p) + 1;
 909
 910     if (len > size)
 911     {
 912         g_free (p);
 913         return NULL;
 914     }
 915
 916     memcpy (buffer, p, len);
 917     g_free (p);
 918
 919     return buffer;
 920 }
 921 #endif /* !ENABLE_VFS */
 922
 923 enum compression_type
 924 get_compression_type (int fd, const char *name)
 925 {
 926     unsigned char magic[16];
 927     size_t str_len;
 928
 929     /* Read the magic signature */
 930     if (mc_read (fd, (char *) magic, 4) != 4)
 931         return COMPRESSION_NONE;
 932
 933     /* GZIP_MAGIC and OLD_GZIP_MAGIC */
 934     if (magic[0] == 037 && (magic[1] == 0213 || magic[1] == 0236))
 935     {
 936         return COMPRESSION_GZIP;
 937     }
 938
 939     /* PKZIP_MAGIC */
 940     if (magic[0] == 0120 && magic[1] == 0113 && magic[2] == 003 && magic[3] == 004)
 941     {
 942         /* Read compression type */
 943         mc_lseek (fd, 8, SEEK_SET);
 944         if (mc_read (fd, (char *) magic, 2) != 2)
 945             return COMPRESSION_NONE;
 946
 947         /* Gzip can handle only deflated (8) or stored (0) files */
 948         if ((magic[0] != 8 && magic[0] != 0) || magic[1] != 0)
 949             return COMPRESSION_NONE;
 950
 951         /* Compatible with gzip */
 952         return COMPRESSION_GZIP;
 953     }
 954
 955     /* PACK_MAGIC and LZH_MAGIC and compress magic */
 956     if (magic[0] == 037 && (magic[1] == 036 || magic[1] == 0240 || magic[1] == 0235))
 957     {
 958         /* Compatible with gzip */
 959         return COMPRESSION_GZIP;
 960     }
 961
 962     /* BZIP and BZIP2 files */
 963     if ((magic[0] == 'B') && (magic[1] == 'Z') && (magic[3] >= '1') && (magic[3] <= '9'))
 964     {
 965         switch (magic[2])
 966         {
 967         case '0':
 968             return COMPRESSION_BZIP;
 969         case 'h':
 970             return COMPRESSION_BZIP2;
 971         }
 972     }
 973
 974     /* Support for LZMA (only utils format with magic in header).
 975      * This is the default format of LZMA utils 4.32.1 and later. */
 976
 977     if (mc_read (fd, (char *) magic + 4, 2) != 2)
 978         return COMPRESSION_NONE;
 979
 980     /* LZMA utils format */
 981     if (magic[0] == 0xFF
 982         && magic[1] == 'L'
 983         && magic[2] == 'Z' && magic[3] == 'M' && magic[4] == 'A' && magic[5] == 0x00)
 984         return COMPRESSION_LZMA;
 985
 986     /* XZ compression magic */
 987     if (magic[0] == 0xFD
 988         && magic[1] == 0x37
 989         && magic[2] == 0x7A && magic[3] == 0x58 && magic[4] == 0x5A && magic[5] == 0x00)
 990         return COMPRESSION_XZ;
 991
 992     str_len = strlen (name);
 993     /* HACK: we must belive to extention of LZMA file :) ... */
 994     if ((str_len > 5 && strcmp (&name[str_len - 5], ".lzma") == 0) ||
 995         (str_len > 4 && strcmp (&name[str_len - 4], ".tlz") == 0))
 996         return COMPRESSION_LZMA;
 997
 998     return COMPRESSION_NONE;
 999 }
1000
1001 const char *
1002 decompress_extension (int type)
1003 {
1004     switch (type)
1005     {
1006     case COMPRESSION_GZIP:
1007         return "#ugz";
1008     case COMPRESSION_BZIP:
1009         return "#ubz";
1010     case COMPRESSION_BZIP2:
1011         return "#ubz2";
1012     case COMPRESSION_LZMA:
1013         return "#ulzma";
1014     case COMPRESSION_XZ:
1015         return "#uxz";
1016     }
1017     /* Should never reach this place */
1018     fprintf (stderr, "Fatal: decompress_extension called with an unknown argument\n");
1019     return 0;
1020 }
1021
1022 /* Hooks */
1023 void
1024 add_hook (Hook ** hook_list, void (*hook_fn) (void *), void *data)
1025 {
1026     Hook *new_hook = g_new (Hook, 1);
1027
1028     new_hook->hook_fn = hook_fn;
1029     new_hook->next = *hook_list;
1030     new_hook->hook_data = data;
1031
1032     *hook_list = new_hook;
1033 }
1034
1035 void
1036 execute_hooks (Hook * hook_list)
1037 {
1038     Hook *new_hook = 0;
1039     Hook *p;
1040
1041     /* We copy the hook list first so tahat we let the hook
1042      * function call delete_hook
1043      */
1044
1045     while (hook_list)
1046     {
1047         add_hook (&new_hook, hook_list->hook_fn, hook_list->hook_data);
1048         hook_list = hook_list->next;
1049     }
1050     p = new_hook;
1051
1052     while (new_hook)
1053     {
1054         (*new_hook->hook_fn) (new_hook->hook_data);
1055         new_hook = new_hook->next;
1056     }
1057
1058     for (hook_list = p; hook_list;)
1059     {
1060         p = hook_list;
1061         hook_list = hook_list->next;
1062         g_free (p);
1063     }
1064 }
1065
1066 void
1067 delete_hook (Hook ** hook_list, void (*hook_fn) (void *))
1068 {
1069     Hook *current, *new_list, *next;
1070
1071     new_list = 0;
1072
1073     for (current = *hook_list; current; current = next)
1074     {
1075         next = current->next;
1076         if (current->hook_fn == hook_fn)
1077             g_free (current);
1078         else
1079             add_hook (&new_list, current->hook_fn, current->hook_data);
1080     }
1081     *hook_list = new_list;
1082 }
1083
1084 int
1085 hook_present (Hook * hook_list, void (*hook_fn) (void *))
1086 {
1087     Hook *p;
1088
1089     for (p = hook_list; p; p = p->next)
1090         if (p->hook_fn == hook_fn)
1091             return 1;
1092     return 0;
1093 }
1094
1095 void
1096 wipe_password (char *passwd)
1097 {
1098     char *p = passwd;
1099
1100     if (!p)
1101         return;
1102     for (; *p; p++)
1103         *p = 0;
1104     g_free (passwd);
1105 }
1106
1107 /* Convert "\E" -> esc character and ^x to control-x key and ^^ to ^ key */
1108 /* Returns a newly allocated string */
1109 char *
1110 convert_controls (const char *p)
1111 {
1112     char *valcopy = g_strdup (p);
1113     char *q;
1114
1115     /* Parse the escape special character */
1116     for (q = valcopy; *p;)
1117     {
1118         if (*p == '\\')
1119         {
1120             p++;
1121             if ((*p == 'e') || (*p == 'E'))
1122             {
1123                 p++;
1124                 *q++ = ESC_CHAR;
1125             }
1126         }
1127         else
1128         {
1129             if (*p == '^')
1130             {
1131                 p++;
1132                 if (*p == '^')
1133                     *q++ = *p++;
1134                 else
1135                 {
1136                     char c = (*p | 0x20);
1137                     if (c >= 'a' && c <= 'z')
1138                     {
1139                         *q++ = c - 'a' + 1;
1140                         p++;
1141                     }
1142                     else if (*p)
1143                         p++;
1144                 }
1145             }
1146             else
1147                 *q++ = *p++;
1148         }
1149     }
1150     *q = 0;
1151     return valcopy;
1152 }
1153
1154 static char *
1155 resolve_symlinks (const char *path)
1156 {
1157     char *buf, *buf2, *q, *r, c;
1158     int len;
1159     struct stat mybuf;
1160     const char *p;
1161
1162     if (*path != PATH_SEP)
1163         return NULL;
1164     r = buf = g_malloc (MC_MAXPATHLEN);
1165     buf2 = g_malloc (MC_MAXPATHLEN);
1166     *r++ = PATH_SEP;
1167     *r = 0;
1168     p = path;
1169     for (;;)
1170     {
1171         q = strchr (p + 1, PATH_SEP);
1172         if (!q)
1173         {
1174             q = strchr (p + 1, 0);
1175             if (q == p + 1)
1176                 break;
1177         }
1178         c = *q;
1179         *q = 0;
1180         if (mc_lstat (path, &mybuf) < 0)
1181         {
1182             g_free (buf);
1183             g_free (buf2);
1184             *q = c;
1185             return NULL;
1186         }
1187         if (!S_ISLNK (mybuf.st_mode))
1188             strcpy (r, p + 1);
1189         else
1190         {
1191             len = mc_readlink (path, buf2, MC_MAXPATHLEN - 1);
1192             if (len < 0)
1193             {
1194                 g_free (buf);
1195                 g_free (buf2);
1196                 *q = c;
1197                 return NULL;
1198             }
1199             buf2[len] = 0;
1200             if (*buf2 == PATH_SEP)
1201                 strcpy (buf, buf2);
1202             else
1203                 strcpy (r, buf2);
1204         }
1205         canonicalize_pathname (buf);
1206         r = strchr (buf, 0);
1207         if (!*r || *(r - 1) != PATH_SEP)
1208         {
1209             *r++ = PATH_SEP;
1210             *r = 0;
1211         }
1212         *q = c;
1213         p = q;
1214         if (!c)
1215             break;
1216     }
1217     if (!*buf)
1218         strcpy (buf, PATH_SEP_STR);
1219     else if (*(r - 1) == PATH_SEP && r != buf + 1)
1220         *(r - 1) = 0;
1221     g_free (buf2);
1222     return buf;
1223 }
1224
1225 static gboolean
1226 mc_util_write_backup_content (const char *from_file_name, const char *to_file_name)
1227 {
1228     FILE *backup_fd;
1229     char *contents;
1230     gsize length;
1231     gboolean ret1 = TRUE;
1232
1233     if (!g_file_get_contents (from_file_name, &contents, &length, NULL))
1234         return FALSE;
1235
1236     backup_fd = fopen (to_file_name, "w");
1237     if (backup_fd == NULL)
1238     {
1239         g_free (contents);
1240         return FALSE;
1241     }
1242
1243     if (fwrite ((const void *) contents, 1, length, backup_fd) != length)
1244         ret1 = FALSE;
1245     {
1246         int ret2;
1247         ret2 = fflush (backup_fd);
1248         ret2 = fclose (backup_fd);
1249     }
1250     g_free (contents);
1251     return ret1;
1252 }
1253
1254 /* Finds out a relative path from first to second, i.e. goes as many ..
1255  * as needed up in first and then goes down using second */
1256 char *
1257 diff_two_paths (const char *first, const char *second)
1258 {
1259     char *p, *q, *r, *s, *buf = NULL;
1260     int i, j, prevlen = -1, currlen;
1261     char *my_first = NULL, *my_second = NULL;
1262
1263     my_first = resolve_symlinks (first);
1264     if (my_first == NULL)
1265         return NULL;
1266     my_second = resolve_symlinks (second);
1267     if (my_second == NULL)
1268     {
1269         g_free (my_first);
1270         return NULL;
1271     }
1272     for (j = 0; j < 2; j++)
1273     {
1274         p = my_first;
1275         q = my_second;
1276         for (;;)
1277         {
1278             r = strchr (p, PATH_SEP);
1279             s = strchr (q, PATH_SEP);
1280             if (!r || !s)
1281                 break;
1282             *r = 0;
1283             *s = 0;
1284             if (strcmp (p, q))
1285             {
1286                 *r = PATH_SEP;
1287                 *s = PATH_SEP;
1288                 break;
1289             }
1290             else
1291             {
1292                 *r = PATH_SEP;
1293                 *s = PATH_SEP;
1294             }
1295             p = r + 1;
1296             q = s + 1;
1297         }
1298         p--;
1299         for (i = 0; (p = strchr (p + 1, PATH_SEP)) != NULL; i++);
1300         currlen = (i + 1) * 3 + strlen (q) + 1;
1301         if (j)
1302         {
1303             if (currlen < prevlen)
1304                 g_free (buf);
1305             else
1306             {
1307                 g_free (my_first);
1308                 g_free (my_second);
1309                 return buf;
1310             }
1311         }
1312         p = buf = g_malloc (currlen);
1313         prevlen = currlen;
1314         for (; i >= 0; i--, p += 3)
1315             strcpy (p, "../");
1316         strcpy (p, q);
1317     }
1318     g_free (my_first);
1319     g_free (my_second);
1320     return buf;
1321 }
1322
1323 /* If filename is NULL, then we just append PATH_SEP to the dir */
1324 char *
1325 concat_dir_and_file (const char *dir, const char *file)
1326 {
1327     int i = strlen (dir);
1328
1329     if (dir[i - 1] == PATH_SEP)
1330         return g_strconcat (dir, file, (char *) NULL);
1331     else
1332         return g_strconcat (dir, PATH_SEP_STR, file, (char *) NULL);
1333 }
1334
1335 /* Append text to GList, remove all entries with the same text */
1336 GList *
1337 list_append_unique (GList * list, char *text)
1338 {
1339     GList *lc_link;
1340
1341     /*
1342      * Go to the last position and traverse the list backwards
1343      * starting from the second last entry to make sure that we
1344      * are not removing the current link.
1345      */
1346     list = g_list_append (list, text);
1347     list = g_list_last (list);
1348     lc_link = g_list_previous (list);
1349
1350     while (lc_link != NULL)
1351     {
1352         GList *newlink;
1353
1354         newlink = g_list_previous (lc_link);
1355         if (strcmp ((char *) lc_link->data, text) == 0)
1356         {
1357             GList *tmp;
1358
1359             g_free (lc_link->data);
1360             tmp = g_list_remove_link (list, lc_link);
1361             g_list_free_1 (lc_link);
1362         }
1363         lc_link = newlink;
1364     }
1365
1366     return list;
1367 }
1368
1369 /* Following code heavily borrows from libiberty, mkstemps.c */
1370
1371 /* Number of attempts to create a temporary file */
1372 #ifndef TMP_MAX
1373 #define TMP_MAX 16384
1374 #endif /* !TMP_MAX */
1375
1376 /*
1377  * Arguments:
1378  * pname (output) - pointer to the name of the temp file (needs g_free).
1379  *                  NULL if the function fails.
1380  * prefix - part of the filename before the random part.
1381  *          Prepend $TMPDIR or /tmp if there are no path separators.
1382  * suffix - if not NULL, part of the filename after the random part.
1383  *
1384  * Result:
1385  * handle of the open file or -1 if couldn't open any.
1386  */
1387 int
1388 mc_mkstemps (char **pname, const char *prefix, const char *suffix)
1389 {
1390     static const char letters[] = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
1391     static unsigned long value;
1392     struct timeval tv;
1393     char *tmpbase;
1394     char *tmpname;
1395     char *XXXXXX;
1396     int count;
1397
1398     if (strchr (prefix, PATH_SEP) == NULL)
1399     {
1400         /* Add prefix first to find the position of XXXXXX */
1401         tmpbase = concat_dir_and_file (mc_tmpdir (), prefix);
1402     }
1403     else
1404     {
1405         tmpbase = g_strdup (prefix);
1406     }
1407
1408     tmpname = g_strconcat (tmpbase, "XXXXXX", suffix, (char *) NULL);
1409     *pname = tmpname;
1410     XXXXXX = &tmpname[strlen (tmpbase)];
1411     g_free (tmpbase);
1412
1413     /* Get some more or less random data.  */
1414     gettimeofday (&tv, NULL);
1415     value += (tv.tv_usec << 16) ^ tv.tv_sec ^ getpid ();
1416
1417     for (count = 0; count < TMP_MAX; ++count)
1418     {
1419         unsigned long v = value;
1420         int fd;
1421
1422         /* Fill in the random bits.  */
1423         XXXXXX[0] = letters[v % 62];
1424         v /= 62;
1425         XXXXXX[1] = letters[v % 62];
1426         v /= 62;
1427         XXXXXX[2] = letters[v % 62];
1428         v /= 62;
1429         XXXXXX[3] = letters[v % 62];
1430         v /= 62;
1431         XXXXXX[4] = letters[v % 62];
1432         v /= 62;
1433         XXXXXX[5] = letters[v % 62];
1434
1435         fd = open (tmpname, O_RDWR | O_CREAT | O_TRUNC | O_EXCL, S_IRUSR | S_IWUSR);
1436         if (fd >= 0)
1437         {
1438             /* Successfully created.  */
1439             return fd;
1440         }
1441
1442         /* This is a random value.  It is only necessary that the next
1443            TMP_MAX values generated by adding 7777 to VALUE are different
1444            with (module 2^32).  */
1445         value += 7777;
1446     }
1447
1448     /* Unsuccessful. Free the filename. */
1449     g_free (tmpname);
1450     *pname = NULL;
1451
1452     return -1;
1453 }
1454
1455 /*
1456  * Read and restore position for the given filename.
1457  * If there is no stored data, return line 1 and col 0.
1458  */
1459 void
1460 load_file_position (const char *filename, long *line, long *column, off_t * offset)
1461 {
1462     char *fn;
1463     FILE *f;
1464     char buf[MC_MAXPATHLEN + 20];
1465     int len;
1466
1467     /* defaults */
1468     *line = 1;
1469     *column = 0;
1470     *offset = 0;
1471
1472     /* open file with positions */
1473     fn = g_build_filename (home_dir, MC_USERCONF_DIR, MC_FILEPOS_FILE, NULL);
1474     f = fopen (fn, "r");
1475     g_free (fn);
1476     if (!f)
1477         return;
1478
1479     len = strlen (filename);
1480
1481     while (fgets (buf, sizeof (buf), f))
1482     {
1483         const char *p;
1484         gchar **pos_tokens;
1485
1486         /* check if the filename matches the beginning of string */
1487         if (strncmp (buf, filename, len) != 0)
1488             continue;
1489
1490         /* followed by single space */
1491         if (buf[len] != ' ')
1492             continue;
1493
1494         /* and string without spaces */
1495         p = &buf[len + 1];
1496         if (strchr (p, ' '))
1497             continue;
1498
1499         pos_tokens = g_strsplit_set (p, ";", 3);
1500         if (pos_tokens[0] != NULL)
1501         {
1502             *line = strtol (pos_tokens[0], NULL, 10);
1503             if (pos_tokens[1] != NULL)
1504             {
1505                 *column = strtol (pos_tokens[1], NULL, 10);
1506                 if (pos_tokens[2] != NULL)
1507                     *offset = strtoll (pos_tokens[2], NULL, 10);
1508                 else
1509                     *offset = 0;
1510             }
1511             else
1512             {
1513                 *column = 0;
1514                 *offset = 0;
1515             }
1516         }
1517         else
1518         {
1519             *line = 1;
1520             *column = 0;
1521             *offset = 0;
1522         }
1523         g_strfreev (pos_tokens);
1524     }
1525     fclose (f);
1526 }
1527
1528 /* Save position for the given file */
1529 #define TMP_SUFFIX ".tmp"
1530 void
1531 save_file_position (const char *filename, long line, long column, off_t offset)
1532 {
1533     static int filepos_max_saved_entries = 0;
1534     char *fn, *tmp_fn;
1535     FILE *f, *tmp_f;
1536     char buf[MC_MAXPATHLEN + 20];
1537     int i = 1;
1538     gsize len;
1539
1540     if (filepos_max_saved_entries == 0)
1541         filepos_max_saved_entries =
1542             mc_config_get_int (mc_main_config, CONFIG_APP_SECTION, "filepos_max_saved_entries",
1543                                1024);
1544
1545     fn = g_build_filename (home_dir, MC_USERCONF_DIR, MC_FILEPOS_FILE, NULL);
1546     if (fn == NULL)
1547         goto early_error;
1548
1549     len = strlen (filename);
1550
1551     mc_util_make_backup_if_possible (fn, TMP_SUFFIX);
1552
1553     /* open file */
1554     f = fopen (fn, "w");
1555     if (f == NULL)
1556         goto open_target_error;
1557
1558     tmp_fn = g_strdup_printf ("%s" TMP_SUFFIX, fn);
1559     tmp_f = fopen (tmp_fn, "r");
1560     if (tmp_f == NULL)
1561         goto open_source_error;
1562
1563     /* put the new record */
1564     if (line != 1 || column != 0)
1565     {
1566         if (fprintf (f, "%s %ld;%ld;%llu\n", filename, line, column, (unsigned long long) offset) <
1567             0)
1568             goto write_position_error;
1569     }
1570
1571     while (fgets (buf, sizeof (buf), tmp_f))
1572     {
1573         if (buf[len] == ' ' && strncmp (buf, filename, len) == 0 && !strchr (&buf[len + 1], ' '))
1574             continue;
1575
1576         fprintf (f, "%s", buf);
1577         if (++i > filepos_max_saved_entries)
1578             break;
1579     }
1580     fclose (tmp_f);
1581     g_free (tmp_fn);
1582     fclose (f);
1583     mc_util_unlink_backup_if_possible (fn, TMP_SUFFIX);
1584     g_free (fn);
1585     return;
1586
1587   write_position_error:
1588     fclose (tmp_f);
1589   open_source_error:
1590     g_free (tmp_fn);
1591     fclose (f);
1592     mc_util_restore_from_backup_if_possible (fn, TMP_SUFFIX);
1593   open_target_error:
1594     g_free (fn);
1595   early_error:
1596     return;
1597 }
1598
1599 #undef TMP_SUFFIX
1600 extern const char *
1601 cstrcasestr (const char *haystack, const char *needle)
1602 {
1603     char *nee = str_create_search_needle (needle, 0);
1604     const char *result = str_search_first (haystack, nee, 0);
1605     str_release_search_needle (nee, 0);
1606     return result;
1607 }
1608
1609 const char *
1610 cstrstr (const char *haystack, const char *needle)
1611 {
1612     return strstr (haystack, needle);
1613 }
1614
1615 extern char *
1616 str_unconst (const char *s)
1617 {
1618     return (char *) s;
1619 }
1620
1621 #define ASCII_A         (0x40 + 1)
1622 #define ASCII_Z         (0x40 + 26)
1623 #define ASCII_a         (0x60 + 1)
1624 #define ASCII_z         (0x60 + 26)
1625
1626 extern int
1627 ascii_alpha_to_cntrl (int ch)
1628 {
1629     if ((ch >= ASCII_A && ch <= ASCII_Z) || (ch >= ASCII_a && ch <= ASCII_z))
1630     {
1631         ch &= 0x1f;
1632     }
1633     return ch;
1634 }
1635
1636 const char *
1637 Q_ (const char *s)
1638 {
1639     const char *result, *sep;
1640
1641     result = _(s);
1642     sep = strchr (result, '|');
1643     return (sep != NULL) ? sep + 1 : result;
1644 }
1645
1646
1647 gboolean
1648 mc_util_make_backup_if_possible (const char *file_name, const char *backup_suffix)
1649 {
1650     struct stat stat_buf;
1651     char *backup_path;
1652     gboolean ret;
1653     if (!exist_file (file_name))
1654         return FALSE;
1655
1656     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1657
1658     if (backup_path == NULL)
1659         return FALSE;
1660
1661     ret = mc_util_write_backup_content (file_name, backup_path);
1662
1663     if (ret)
1664     {
1665         /* Backup file will have same ownership with main file. */
1666         if (stat (file_name, &stat_buf) == 0)
1667             chmod (backup_path, stat_buf.st_mode);
1668         else
1669             chmod (backup_path, S_IRUSR | S_IWUSR);
1670     }
1671
1672     g_free (backup_path);
1673
1674     return ret;
1675 }
1676
1677 gboolean
1678 mc_util_restore_from_backup_if_possible (const char *file_name, const char *backup_suffix)
1679 {
1680     gboolean ret;
1681     char *backup_path;
1682
1683     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1684     if (backup_path == NULL)
1685         return FALSE;
1686
1687     ret = mc_util_write_backup_content (backup_path, file_name);
1688     g_free (backup_path);
1689
1690     return ret;
1691 }
1692
1693 gboolean
1694 mc_util_unlink_backup_if_possible (const char *file_name, const char *backup_suffix)
1695 {
1696     char *backup_path;
1697
1698     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1699     if (backup_path == NULL)
1700         return FALSE;
1701
1702     if (exist_file (backup_path))
1703         mc_unlink (backup_path);
1704
1705     g_free (backup_path);
1706     return TRUE;
1707 }
1708
1709 /* partly taken from dcigettext.c, returns "" for default locale */
1710 /* value should be freed by calling function g_free() */
1711 char *
1712 guess_message_value (void)
1713 {
1714     static const char *const var[] = {
1715         /* Setting of LC_ALL overwrites all other.  */
1716         /* Do not use LANGUAGE for check user locale and drowing hints */
1717         "LC_ALL",
1718         /* Next comes the name of the desired category.  */
1719         "LC_MESSAGES",
1720         /* Last possibility is the LANG environment variable.  */
1721         "LANG",
1722         /* NULL exit loops */
1723         NULL
1724     };
1725
1726     unsigned i = 0;
1727     const char *locale = NULL;
1728
1729     while (var[i] != NULL)
1730     {
1731         locale = getenv (var[i]);
1732         if (locale != NULL && locale[0] != '\0')
1733             break;
1734         i++;
1735     }
1736
1737     if (locale == NULL)
1738         locale = "";
1739
1740     return g_strdup (locale);
1741 }