lib/util.c

   1 /*
   2    Various utilities
   3
   4    Copyright (C) 1994-2016
   5    Free Software Foundation, Inc.
   6
   7    Written by:
   8    Miguel de Icaza, 1994, 1995, 1996
   9    Janne Kukonlehto, 1994, 1995, 1996
  10    Dugan Porter, 1994, 1995, 1996
  11    Jakub Jelinek, 1994, 1995, 1996
  12    Mauricio Plaza, 1994, 1995, 1996
  13    Slava Zanko <slavazanko@gmail.com>, 2013
  14
  15    This file is part of the Midnight Commander.
  16
  17    The Midnight Commander is free software: you can redistribute it
  18    and/or modify it under the terms of the GNU General Public License as
  19    published by the Free Software Foundation, either version 3 of the License,
  20    or (at your option) any later version.
  21
  22    The Midnight Commander is distributed in the hope that it will be useful,
  23    but WITHOUT ANY WARRANTY; without even the implied warranty of
  24    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25    GNU General Public License for more details.
  26
  27    You should have received a copy of the GNU General Public License
  28    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  29  */
  30
  31 /** \file lib/util.c
  32  *  \brief Source: various utilities
  33  */
  34
  35 #include <config.h>
  36
  37 #include <ctype.h>
  38 #include <limits.h>
  39 #include <stdarg.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <sys/time.h>
  44 #include <sys/types.h>
  45 #include <sys/stat.h>
  46 #include <unistd.h>
  47
  48 #include "lib/global.h"
  49 #include "lib/mcconfig.h"
  50 #include "lib/fileloc.h"
  51 #include "lib/vfs/vfs.h"
  52 #include "lib/strutil.h"
  53 #include "lib/util.h"
  54 #include "lib/timer.h"
  55
  56 /*** global variables ****************************************************************************/
  57
  58 /*** file scope macro definitions ****************************************************************/
  59
  60 #define ismode(n,m) ((n & m) == m)
  61
  62 /* Number of attempts to create a temporary file */
  63 #ifndef TMP_MAX
  64 #define TMP_MAX 16384
  65 #endif /* !TMP_MAX */
  66
  67 #define TMP_SUFFIX ".tmp"
  68
  69 #define ASCII_A (0x40 + 1)
  70 #define ASCII_Z (0x40 + 26)
  71 #define ASCII_a (0x60 + 1)
  72 #define ASCII_z (0x60 + 26)
  73
  74 /*** file scope type declarations ****************************************************************/
  75
  76 /*** file scope variables ************************************************************************/
  77
  78 /*** file scope functions ************************************************************************/
  79 /* --------------------------------------------------------------------------------------------- */
  80
  81 #ifndef HAVE_CHARSET
  82 static inline int
  83 is_7bit_printable (unsigned char c)
  84 {
  85     return (c > 31 && c < 127);
  86 }
  87 #endif
  88
  89 /* --------------------------------------------------------------------------------------------- */
  90
  91 static inline int
  92 is_iso_printable (unsigned char c)
  93 {
  94     return ((c > 31 && c < 127) || c >= 160);
  95 }
  96
  97 /* --------------------------------------------------------------------------------------------- */
  98
  99 static inline int
 100 is_8bit_printable (unsigned char c)
 101 {
 102     /* "Full 8 bits output" doesn't work on xterm */
 103     if (mc_global.tty.xterm_flag)
 104         return is_iso_printable (c);
 105
 106     return (c > 31 && c != 127 && c != 155);
 107 }
 108
 109 /* --------------------------------------------------------------------------------------------- */
 110
 111 static char *
 112 resolve_symlinks (const vfs_path_t * vpath)
 113 {
 114     char *p, *p2;
 115     char *buf, *buf2, *q, *r, c;
 116     struct stat mybuf;
 117
 118     if (vpath->relative)
 119         return NULL;
 120
 121     p = p2 = g_strdup (vfs_path_as_str (vpath));
 122     r = buf = g_malloc (MC_MAXPATHLEN);
 123     buf2 = g_malloc (MC_MAXPATHLEN);
 124     *r++ = PATH_SEP;
 125     *r = 0;
 126
 127     do
 128     {
 129         q = strchr (p + 1, PATH_SEP);
 130         if (!q)
 131         {
 132             q = strchr (p + 1, 0);
 133             if (q == p + 1)
 134                 break;
 135         }
 136         c = *q;
 137         *q = 0;
 138         if (mc_lstat (vpath, &mybuf) < 0)
 139         {
 140             MC_PTR_FREE (buf);
 141             goto ret;
 142         }
 143         if (!S_ISLNK (mybuf.st_mode))
 144             strcpy (r, p + 1);
 145         else
 146         {
 147             int len;
 148
 149             len = mc_readlink (vpath, buf2, MC_MAXPATHLEN - 1);
 150             if (len < 0)
 151             {
 152                 MC_PTR_FREE (buf);
 153                 goto ret;
 154             }
 155             buf2[len] = 0;
 156             if (IS_PATH_SEP (*buf2))
 157                 strcpy (buf, buf2);
 158             else
 159                 strcpy (r, buf2);
 160         }
 161         canonicalize_pathname (buf);
 162         r = strchr (buf, 0);
 163         if (*r == '\0' || !IS_PATH_SEP (r[-1]))
 164             /* FIXME: this condition is always true because r points to the EOL */
 165         {
 166             *r++ = PATH_SEP;
 167             *r = '\0';
 168         }
 169         *q = c;
 170         p = q;
 171     }
 172     while (c != '\0');
 173
 174     if (*buf == '\0')
 175         strcpy (buf, PATH_SEP_STR);
 176     else if (IS_PATH_SEP (r[-1]) && r != buf + 1)
 177         r[-1] = '\0';
 178
 179   ret:
 180     g_free (buf2);
 181     g_free (p2);
 182     return buf;
 183 }
 184
 185 /* --------------------------------------------------------------------------------------------- */
 186
 187 static gboolean
 188 mc_util_write_backup_content (const char *from_file_name, const char *to_file_name)
 189 {
 190     FILE *backup_fd;
 191     char *contents;
 192     gsize length;
 193     gboolean ret1 = TRUE;
 194
 195     if (!g_file_get_contents (from_file_name, &contents, &length, NULL))
 196         return FALSE;
 197
 198     backup_fd = fopen (to_file_name, "w");
 199     if (backup_fd == NULL)
 200     {
 201         g_free (contents);
 202         return FALSE;
 203     }
 204
 205     if (fwrite ((const void *) contents, 1, length, backup_fd) != length)
 206         ret1 = FALSE;
 207     {
 208         int ret2;
 209
 210         /* cppcheck-suppress redundantAssignment */
 211         ret2 = fflush (backup_fd);
 212         /* cppcheck-suppress redundantAssignment */
 213         ret2 = fclose (backup_fd);
 214         (void) ret2;
 215     }
 216     g_free (contents);
 217     return ret1;
 218 }
 219
 220 /* --------------------------------------------------------------------------------------------- */
 221 /*** public functions ****************************************************************************/
 222 /* --------------------------------------------------------------------------------------------- */
 223
 224 int
 225 is_printable (int c)
 226 {
 227     c &= 0xff;
 228
 229 #ifdef HAVE_CHARSET
 230     /* "Display bits" is ignored, since the user controls the output
 231        by setting the output codepage */
 232     return is_8bit_printable (c);
 233 #else
 234     if (!mc_global.eight_bit_clean)
 235         return is_7bit_printable (c);
 236
 237     if (mc_global.full_eight_bits)
 238     {
 239         return is_8bit_printable (c);
 240     }
 241     else
 242         return is_iso_printable (c);
 243 #endif /* !HAVE_CHARSET */
 244 }
 245
 246 /* --------------------------------------------------------------------------------------------- */
 247 /**
 248  * Quote the filename for the purpose of inserting it into the command
 249  * line.  If quote_percent is TRUE, replace "%" with "%%" - the percent is
 250  * processed by the mc command line.
 251  */
 252 char *
 253 name_quote (const char *s, gboolean quote_percent)
 254 {
 255     GString *ret;
 256
 257     ret = g_string_sized_new (64);
 258
 259     if (*s == '-')
 260         g_string_append (ret, "." PATH_SEP_STR);
 261
 262     for (; *s != '\0'; s++)
 263     {
 264         switch (*s)
 265         {
 266         case '%':
 267             if (quote_percent)
 268                 g_string_append_c (ret, '%');
 269             break;
 270         case '\'':
 271         case '\\':
 272         case '\r':
 273         case '\n':
 274         case '\t':
 275         case '"':
 276         case ';':
 277         case ' ':
 278         case '?':
 279         case '|':
 280         case '[':
 281         case ']':
 282         case '{':
 283         case '}':
 284         case '<':
 285         case '>':
 286         case '`':
 287         case '!':
 288         case '$':
 289         case '&':
 290         case '*':
 291         case '(':
 292         case ')':
 293             g_string_append_c (ret, '\\');
 294             break;
 295         case '~':
 296         case '#':
 297             if (ret->len == 0)
 298                 g_string_append_c (ret, '\\');
 299             break;
 300         default:
 301             break;
 302         }
 303         g_string_append_c (ret, *s);
 304     }
 305
 306     return g_string_free (ret, FALSE);
 307 }
 308
 309 /* --------------------------------------------------------------------------------------------- */
 310
 311 char *
 312 fake_name_quote (const char *s, gboolean quote_percent)
 313 {
 314     (void) quote_percent;
 315     return g_strdup (s);
 316 }
 317
 318 /* --------------------------------------------------------------------------------------------- */
 319 /**
 320  * path_trunc() is the same as str_trunc() but
 321  * it deletes possible password from path for security
 322  * reasons.
 323  */
 324
 325 const char *
 326 path_trunc (const char *path, size_t trunc_len)
 327 {
 328     vfs_path_t *vpath;
 329     char *secure_path;
 330     const char *ret;
 331
 332     vpath = vfs_path_from_str (path);
 333     secure_path = vfs_path_to_str_flags (vpath, 0, VPF_STRIP_PASSWORD);
 334     vfs_path_free (vpath);
 335
 336     ret = str_trunc (secure_path, trunc_len);
 337     g_free (secure_path);
 338
 339     return ret;
 340 }
 341
 342 /* --------------------------------------------------------------------------------------------- */
 343
 344 const char *
 345 size_trunc (uintmax_t size, gboolean use_si)
 346 {
 347     static char x[BUF_TINY];
 348     uintmax_t divisor = 1;
 349     const char *xtra = _("B");
 350
 351     if (size > 999999999UL)
 352     {
 353         divisor = use_si ? 1000 : 1024;
 354         xtra = use_si ? _("kB") : _("KiB");
 355
 356         if (size / divisor > 999999999UL)
 357         {
 358             divisor = use_si ? (1000 * 1000) : (1024 * 1024);
 359             xtra = use_si ? _("MB") : _("MiB");
 360
 361             if (size / divisor > 999999999UL)
 362             {
 363                 divisor = use_si ? (1000 * 1000 * 1000) : (1024 * 1024 * 1024);
 364                 xtra = use_si ? _("GB") : _("GiB");
 365             }
 366         }
 367     }
 368     g_snprintf (x, sizeof (x), "%.0f %s", 1.0 * size / divisor, xtra);
 369     return x;
 370 }
 371
 372 /* --------------------------------------------------------------------------------------------- */
 373
 374 const char *
 375 size_trunc_sep (uintmax_t size, gboolean use_si)
 376 {
 377     static char x[60];
 378     int count;
 379     const char *p, *y;
 380     char *d;
 381
 382     p = y = size_trunc (size, use_si);
 383     p += strlen (p) - 1;
 384     d = x + sizeof (x) - 1;
 385     *d-- = '\0';
 386     while (p >= y && (isalpha ((unsigned char) *p) || (unsigned char) *p == ' '))
 387         *d-- = *p--;
 388     for (count = 0; p >= y; count++)
 389     {
 390         if (count == 3)
 391         {
 392             *d-- = ',';
 393             count = 0;
 394         }
 395         *d-- = *p--;
 396     }
 397     d++;
 398     if (*d == ',')
 399         d++;
 400     return d;
 401 }
 402
 403 /* --------------------------------------------------------------------------------------------- */
 404 /**
 405  * Print file SIZE to BUFFER, but don't exceed LEN characters,
 406  * not including trailing 0. BUFFER should be at least LEN+1 long.
 407  * This function is called for every file on panels, so avoid
 408  * floating point by any means.
 409  *
 410  * Units: size units (filesystem sizes are 1K blocks)
 411  *    0=bytes, 1=Kbytes, 2=Mbytes, etc.
 412  */
 413
 414 void
 415 size_trunc_len (char *buffer, unsigned int len, uintmax_t size, int units, gboolean use_si)
 416 {
 417     /* Avoid taking power for every file.  */
 418     /* *INDENT-OFF* */
 419     static const uintmax_t power10[] = {
 420     /* we hope that size of uintmax_t is 4 bytes at least */
 421         1ULL,
 422         10ULL,
 423         100ULL,
 424         1000ULL,
 425         10000ULL,
 426         100000ULL,
 427         1000000ULL,
 428         10000000ULL,
 429         100000000ULL,
 430         1000000000ULL
 431     /* maximum value of uintmax_t (in case of 4 bytes) is
 432         4294967295
 433      */
 434 #if SIZEOF_UINTMAX_T == 8
 435                      ,
 436         10000000000ULL,
 437         100000000000ULL,
 438         1000000000000ULL,
 439         10000000000000ULL,
 440         100000000000000ULL,
 441         1000000000000000ULL,
 442         10000000000000000ULL,
 443         100000000000000000ULL,
 444         1000000000000000000ULL,
 445         10000000000000000000ULL
 446     /* maximum value of uintmax_t (in case of 8 bytes) is
 447         18447644073710439615
 448      */
 449 #endif
 450     };
 451
 452     static const char *const units_iec[] = { N_("B"), N_("KiB"), N_("MiB"), N_("GiB"), N_("TiB"),
 453                                              N_("PiB"), N_("EiB"), N_("ZiB"), N_("YiB"), NULL };
 454     static const char *const units_si[] = { N_("B"), N_("kB"), N_("MB"), N_("GB"), N_("TB"),
 455                                             N_("PB"), N_("EB"), N_("ZB"), N_("YB"), NULL };
 456     /* *INDENT-ON* */
 457
 458     const char *const *sfx = use_si ? units_si : units_iec;
 459     int j = 0;
 460
 461     if (len == 0)
 462         len = 9;
 463 #if SIZEOF_UINTMAX_T == 8
 464     /* 20 decimal digits are required to represent 8 bytes */
 465     else if (len > 21)
 466         len = 21;
 467 #else
 468     /* 10 decimal digits are required to represent 4 bytes */
 469     else if (len > 11)
 470         len = 11;
 471 #endif
 472
 473     /*
 474      * recalculate from 1024 base to 1000 base if units>0
 475      * We can't just multiply by 1024 - that might cause overflow
 476      * if uintmax_t type is too small
 477      */
 478     if (use_si)
 479         for (j = 0; j < units; j++)
 480         {
 481             uintmax_t size_remain;
 482
 483             size_remain = ((size % 125) * 1024) / 1000; /* size mod 125, recalculated */
 484             size /= 125;        /* 128/125 = 1024/1000 */
 485             size *= 128;        /* This will convert size from multiple of 1024 to multiple of 1000 */
 486             size += size_remain;        /* Re-add remainder lost by division/multiplication */
 487         }
 488
 489     for (j = units; sfx[j] != NULL; j++)
 490     {
 491         if (size == 0)
 492         {
 493             if (j == units)
 494             {
 495                 /* Empty files will print "0 B" even with minimal width.  */
 496                 g_snprintf (buffer, len + 1, "0 %s", _("B"));
 497             }
 498             else
 499             {
 500                 /* Use "~KiB/kB" or just "KiB/kB" if len is 1.  Use "B" for bytes.  */
 501                 g_snprintf (buffer, len + 1, (len > 1) ? "~%s" : "%s",
 502                             (j > 1) ? _(sfx[j - 1]) : _("B"));
 503             }
 504             break;
 505         }
 506
 507         /*
 508          * Offset calculation: 1 for space + 2*3 bytes for scaled units as multibyte
 509          * encoding with UTF-8 for non-Latin scripts.
 510          */
 511         if (size < power10[len - (1 + 6)])
 512         {
 513             g_snprintf (buffer, len + 1, "%" PRIuMAX " %s", size, _(sfx[j]));
 514             break;
 515         }
 516
 517         /* Powers of 1000 or 1024, with rounding.  */
 518         if (use_si)
 519             size = (size + 500) / 1000;
 520         else
 521             size = (size + 512) >> 10;
 522     }
 523 }
 524
 525 /* --------------------------------------------------------------------------------------------- */
 526
 527 const char *
 528 string_perm (mode_t mode_bits)
 529 {
 530     static char mode[11];
 531
 532     strcpy (mode, "----------");
 533     if (S_ISDIR (mode_bits))
 534         mode[0] = 'd';
 535     if (S_ISCHR (mode_bits))
 536         mode[0] = 'c';
 537     if (S_ISBLK (mode_bits))
 538         mode[0] = 'b';
 539     if (S_ISLNK (mode_bits))
 540         mode[0] = 'l';
 541     if (S_ISFIFO (mode_bits))
 542         mode[0] = 'p';
 543     if (S_ISNAM (mode_bits))
 544         mode[0] = 'n';
 545     if (S_ISSOCK (mode_bits))
 546         mode[0] = 's';
 547     if (S_ISDOOR (mode_bits))
 548         mode[0] = 'D';
 549     if (ismode (mode_bits, S_IXOTH))
 550         mode[9] = 'x';
 551     if (ismode (mode_bits, S_IWOTH))
 552         mode[8] = 'w';
 553     if (ismode (mode_bits, S_IROTH))
 554         mode[7] = 'r';
 555     if (ismode (mode_bits, S_IXGRP))
 556         mode[6] = 'x';
 557     if (ismode (mode_bits, S_IWGRP))
 558         mode[5] = 'w';
 559     if (ismode (mode_bits, S_IRGRP))
 560         mode[4] = 'r';
 561     if (ismode (mode_bits, S_IXUSR))
 562         mode[3] = 'x';
 563     if (ismode (mode_bits, S_IWUSR))
 564         mode[2] = 'w';
 565     if (ismode (mode_bits, S_IRUSR))
 566         mode[1] = 'r';
 567 #ifdef S_ISUID
 568     if (ismode (mode_bits, S_ISUID))
 569         mode[3] = (mode[3] == 'x') ? 's' : 'S';
 570 #endif /* S_ISUID */
 571 #ifdef S_ISGID
 572     if (ismode (mode_bits, S_ISGID))
 573         mode[6] = (mode[6] == 'x') ? 's' : 'S';
 574 #endif /* S_ISGID */
 575 #ifdef S_ISVTX
 576     if (ismode (mode_bits, S_ISVTX))
 577         mode[9] = (mode[9] == 'x') ? 't' : 'T';
 578 #endif /* S_ISVTX */
 579     return mode;
 580 }
 581
 582 /* --------------------------------------------------------------------------------------------- */
 583
 584 const char *
 585 extension (const char *filename)
 586 {
 587     const char *d = strrchr (filename, '.');
 588     return (d != NULL) ? d + 1 : "";
 589 }
 590
 591 /* --------------------------------------------------------------------------------------------- */
 592
 593 char *
 594 load_mc_home_file (const char *from, const char *filename, char **allocated_filename,
 595                    size_t * length)
 596 {
 597     char *hintfile_base, *hintfile;
 598     char *lang;
 599     char *data;
 600
 601     hintfile_base = g_build_filename (from, filename, (char *) NULL);
 602     lang = guess_message_value ();
 603
 604     hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 605     if (!g_file_get_contents (hintfile, &data, length, NULL))
 606     {
 607         /* Fall back to the two-letter language code */
 608         if (lang[0] != '\0' && lang[1] != '\0')
 609             lang[2] = '\0';
 610         g_free (hintfile);
 611         hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 612         if (!g_file_get_contents (hintfile, &data, length, NULL))
 613         {
 614             g_free (hintfile);
 615             hintfile = hintfile_base;
 616             g_file_get_contents (hintfile_base, &data, length, NULL);
 617         }
 618     }
 619
 620     g_free (lang);
 621
 622     if (hintfile != hintfile_base)
 623         g_free (hintfile_base);
 624
 625     if (allocated_filename != NULL)
 626         *allocated_filename = hintfile;
 627     else
 628         g_free (hintfile);
 629
 630     return data;
 631 }
 632
 633 /* --------------------------------------------------------------------------------------------- */
 634
 635 const char *
 636 extract_line (const char *s, const char *top)
 637 {
 638     static char tmp_line[BUF_MEDIUM];
 639     char *t = tmp_line;
 640
 641     while (*s && *s != '\n' && (size_t) (t - tmp_line) < sizeof (tmp_line) - 1 && s < top)
 642         *t++ = *s++;
 643     *t = 0;
 644     return tmp_line;
 645 }
 646
 647 /* --------------------------------------------------------------------------------------------- */
 648 /**
 649  * The basename routine
 650  */
 651
 652 const char *
 653 x_basename (const char *s)
 654 {
 655     const char *url_delim, *path_sep;
 656
 657     url_delim = g_strrstr (s, VFS_PATH_URL_DELIMITER);
 658     path_sep = strrchr (s, PATH_SEP);
 659
 660     if (path_sep == NULL)
 661         return s;
 662
 663     if (url_delim == NULL
 664         || url_delim < path_sep - strlen (VFS_PATH_URL_DELIMITER)
 665         || url_delim - s + strlen (VFS_PATH_URL_DELIMITER) < strlen (s))
 666     {
 667         /* avoid trailing PATH_SEP, if present */
 668         if (!IS_PATH_SEP (s[strlen (s) - 1]))
 669             return (path_sep != NULL) ? path_sep + 1 : s;
 670
 671         while (--path_sep > s && !IS_PATH_SEP (*path_sep))
 672             ;
 673         return (path_sep != s) ? path_sep + 1 : s;
 674     }
 675
 676     while (--url_delim > s && !IS_PATH_SEP (*url_delim))
 677         ;
 678     while (--url_delim > s && !IS_PATH_SEP (*url_delim))
 679         ;
 680
 681     return (url_delim == s) ? s : url_delim + 1;
 682 }
 683
 684 /* --------------------------------------------------------------------------------------------- */
 685
 686 const char *
 687 unix_error_string (int error_num)
 688 {
 689     static char buffer[BUF_LARGE];
 690     gchar *strerror_currentlocale;
 691
 692     strerror_currentlocale = g_locale_from_utf8 (g_strerror (error_num), -1, NULL, NULL, NULL);
 693     g_snprintf (buffer, sizeof (buffer), "%s (%d)", strerror_currentlocale, error_num);
 694     g_free (strerror_currentlocale);
 695
 696     return buffer;
 697 }
 698
 699 /* --------------------------------------------------------------------------------------------- */
 700
 701 const char *
 702 skip_separators (const char *s)
 703 {
 704     const char *su = s;
 705
 706     for (; *su; str_cnext_char (&su))
 707         if (*su != ' ' && *su != '\t' && *su != ',')
 708             break;
 709
 710     return su;
 711 }
 712
 713 /* --------------------------------------------------------------------------------------------- */
 714
 715 const char *
 716 skip_numbers (const char *s)
 717 {
 718     const char *su = s;
 719
 720     for (; *su; str_cnext_char (&su))
 721         if (!str_isdigit (su))
 722             break;
 723
 724     return su;
 725 }
 726
 727 /* --------------------------------------------------------------------------------------------- */
 728 /**
 729  * Remove all control sequences from the argument string.  We define
 730  * "control sequence", in a sort of pidgin BNF, as follows:
 731  *
 732  * control-seq = Esc non-'['
 733  *             | Esc '[' (0 or more digits or ';' or ':' or '?') (any other char)
 734  *
 735  * The 256-color and true-color escape sequences should allow either ';' or ':' inside as separator,
 736  * actually, ':' is the more correct according to ECMA-48.
 737  * Some terminal emulators (e.g. xterm, gnome-terminal) support this.
 738  *
 739  * Non-printable characters are also removed.
 740  */
 741
 742 char *
 743 strip_ctrl_codes (char *s)
 744 {
 745     char *w;                    /* Current position where the stripped data is written */
 746     char *r;                    /* Current position where the original data is read */
 747
 748     if (s == NULL)
 749         return NULL;
 750
 751     for (w = s, r = s; *r != '\0';)
 752     {
 753         if (*r == ESC_CHAR)
 754         {
 755             /* Skip the control sequence's arguments */ ;
 756             /* '(' need to avoid strange 'B' letter in *Suse (if mc runs under root user) */
 757             if (*(++r) == '[' || *r == '(')
 758             {
 759                 /* strchr() matches trailing binary 0 */
 760                 while (*(++r) != '\0' && strchr ("0123456789;:?", *r) != NULL)
 761                     ;
 762             }
 763             else if (*r == ']')
 764             {
 765                 /*
 766                  * Skip xterm's OSC (Operating System Command)
 767                  * http://www.xfree86.org/current/ctlseqs.html
 768                  * OSC P s ; P t ST
 769                  * OSC P s ; P t BEL
 770                  */
 771                 char *new_r = r;
 772
 773                 for (; *new_r != '\0'; ++new_r)
 774                 {
 775                     switch (*new_r)
 776                     {
 777                         /* BEL */
 778                     case '\a':
 779                         r = new_r;
 780                         goto osc_out;
 781                     case ESC_CHAR:
 782                         /* ST */
 783                         if (*(new_r + 1) == '\\')
 784                         {
 785                             r = new_r + 1;
 786                             goto osc_out;
 787                         }
 788                     default:
 789                         break;
 790                     }
 791                 }
 792               osc_out:
 793                 ;
 794             }
 795
 796             /*
 797              * Now we are at the last character of the sequence.
 798              * Skip it unless it's binary 0.
 799              */
 800             if (*r != '\0')
 801                 r++;
 802         }
 803         else
 804         {
 805             char *n;
 806
 807             n = str_get_next_char (r);
 808             if (str_isprint (r))
 809             {
 810                 memmove (w, r, n - r);
 811                 w += n - r;
 812             }
 813             r = n;
 814         }
 815     }
 816
 817     *w = '\0';
 818     return s;
 819 }
 820
 821 /* --------------------------------------------------------------------------------------------- */
 822
 823 enum compression_type
 824 get_compression_type (int fd, const char *name)
 825 {
 826     unsigned char magic[16];
 827     size_t str_len;
 828
 829     /* Read the magic signature */
 830     if (mc_read (fd, (char *) magic, 4) != 4)
 831         return COMPRESSION_NONE;
 832
 833     /* GZIP_MAGIC and OLD_GZIP_MAGIC */
 834     if (magic[0] == 037 && (magic[1] == 0213 || magic[1] == 0236))
 835     {
 836         return COMPRESSION_GZIP;
 837     }
 838
 839     /* PKZIP_MAGIC */
 840     if (magic[0] == 0120 && magic[1] == 0113 && magic[2] == 003 && magic[3] == 004)
 841     {
 842         /* Read compression type */
 843         mc_lseek (fd, 8, SEEK_SET);
 844         if (mc_read (fd, (char *) magic, 2) != 2)
 845             return COMPRESSION_NONE;
 846
 847         /* Gzip can handle only deflated (8) or stored (0) files */
 848         if ((magic[0] != 8 && magic[0] != 0) || magic[1] != 0)
 849             return COMPRESSION_NONE;
 850
 851         /* Compatible with gzip */
 852         return COMPRESSION_GZIP;
 853     }
 854
 855     /* PACK_MAGIC and LZH_MAGIC and compress magic */
 856     if (magic[0] == 037 && (magic[1] == 036 || magic[1] == 0240 || magic[1] == 0235))
 857     {
 858         /* Compatible with gzip */
 859         return COMPRESSION_GZIP;
 860     }
 861
 862     /* BZIP and BZIP2 files */
 863     if ((magic[0] == 'B') && (magic[1] == 'Z') && (magic[3] >= '1') && (magic[3] <= '9'))
 864     {
 865         switch (magic[2])
 866         {
 867         case '0':
 868             return COMPRESSION_BZIP;
 869         case 'h':
 870             return COMPRESSION_BZIP2;
 871         default:
 872             break;
 873         }
 874     }
 875
 876     /* LZ4 format - v1.5.0 - 0x184D2204 (little endian) */
 877     if (magic[0] == 0x04 && magic[1] == 0x22 && magic[2] == 0x4d && magic[3] == 0x18)
 878         return COMPRESSION_LZ4;
 879
 880     if (mc_read (fd, (char *) magic + 4, 2) != 2)
 881         return COMPRESSION_NONE;
 882
 883     /* LZIP files */
 884     if (magic[0] == 'L'
 885         && magic[1] == 'Z'
 886         && magic[2] == 'I' && magic[3] == 'P' && (magic[4] == 0x00 || magic[4] == 0x01))
 887         return COMPRESSION_LZIP;
 888
 889     /* Support for LZMA (only utils format with magic in header).
 890      * This is the default format of LZMA utils 4.32.1 and later. */
 891     if (magic[0] == 0xFF
 892         && magic[1] == 'L'
 893         && magic[2] == 'Z' && magic[3] == 'M' && magic[4] == 'A' && magic[5] == 0x00)
 894         return COMPRESSION_LZMA;
 895
 896     /* XZ compression magic */
 897     if (magic[0] == 0xFD
 898         && magic[1] == 0x37
 899         && magic[2] == 0x7A && magic[3] == 0x58 && magic[4] == 0x5A && magic[5] == 0x00)
 900         return COMPRESSION_XZ;
 901
 902     str_len = strlen (name);
 903     /* HACK: we must belive to extension of LZMA file :) ... */
 904     if ((str_len > 5 && strcmp (&name[str_len - 5], ".lzma") == 0) ||
 905         (str_len > 4 && strcmp (&name[str_len - 4], ".tlz") == 0))
 906         return COMPRESSION_LZMA;
 907
 908     return COMPRESSION_NONE;
 909 }
 910
 911 /* --------------------------------------------------------------------------------------------- */
 912
 913 const char *
 914 decompress_extension (int type)
 915 {
 916     switch (type)
 917     {
 918     case COMPRESSION_GZIP:
 919         return "/ugz" VFS_PATH_URL_DELIMITER;
 920     case COMPRESSION_BZIP:
 921         return "/ubz" VFS_PATH_URL_DELIMITER;
 922     case COMPRESSION_BZIP2:
 923         return "/ubz2" VFS_PATH_URL_DELIMITER;
 924     case COMPRESSION_LZIP:
 925         return "/ulz" VFS_PATH_URL_DELIMITER;
 926     case COMPRESSION_LZ4:
 927         return "/ulz4" VFS_PATH_URL_DELIMITER;
 928     case COMPRESSION_LZMA:
 929         return "/ulzma" VFS_PATH_URL_DELIMITER;
 930     case COMPRESSION_XZ:
 931         return "/uxz" VFS_PATH_URL_DELIMITER;
 932     default:
 933         break;
 934     }
 935     /* Should never reach this place */
 936     fprintf (stderr, "Fatal: decompress_extension called with an unknown argument\n");
 937     return 0;
 938 }
 939
 940 /* --------------------------------------------------------------------------------------------- */
 941
 942 void
 943 wipe_password (char *passwd)
 944 {
 945     char *p = passwd;
 946
 947     if (!p)
 948         return;
 949     for (; *p; p++)
 950         *p = 0;
 951     g_free (passwd);
 952 }
 953
 954 /* --------------------------------------------------------------------------------------------- */
 955 /**
 956  * Convert "\E" -> esc character and ^x to control-x key and ^^ to ^ key
 957  *
 958  * @param p pointer to string
 959  *
 960  * @return newly allocated string
 961  */
 962
 963 char *
 964 convert_controls (const char *p)
 965 {
 966     char *valcopy = g_strdup (p);
 967     char *q;
 968
 969     /* Parse the escape special character */
 970     for (q = valcopy; *p;)
 971     {
 972         if (*p == '\\')
 973         {
 974             p++;
 975             if ((*p == 'e') || (*p == 'E'))
 976             {
 977                 p++;
 978                 *q++ = ESC_CHAR;
 979             }
 980         }
 981         else
 982         {
 983             if (*p == '^')
 984             {
 985                 p++;
 986                 if (*p == '^')
 987                     *q++ = *p++;
 988                 else
 989                 {
 990                     char c = (*p | 0x20);
 991                     if (c >= 'a' && c <= 'z')
 992                     {
 993                         *q++ = c - 'a' + 1;
 994                         p++;
 995                     }
 996                     else if (*p)
 997                         p++;
 998                 }
 999             }
1000             else
1001                 *q++ = *p++;
1002         }
1003     }
1004     *q = 0;
1005     return valcopy;
1006 }
1007
1008 /* --------------------------------------------------------------------------------------------- */
1009 /**
1010  * Finds out a relative path from first to second, i.e. goes as many ..
1011  * as needed up in first and then goes down using second
1012  */
1013
1014 char *
1015 diff_two_paths (const vfs_path_t * vpath1, const vfs_path_t * vpath2)
1016 {
1017     char *p, *q, *r, *s, *buf = NULL;
1018     int i, j, prevlen = -1, currlen;
1019     char *my_first = NULL, *my_second = NULL;
1020
1021     my_first = resolve_symlinks (vpath1);
1022     if (my_first == NULL)
1023         goto ret;
1024
1025     my_second = resolve_symlinks (vpath2);
1026     if (my_second == NULL)
1027         goto ret;
1028
1029     for (j = 0; j < 2; j++)
1030     {
1031         p = my_first;
1032         q = my_second;
1033         while (TRUE)
1034         {
1035             r = strchr (p, PATH_SEP);
1036             s = strchr (q, PATH_SEP);
1037             if (r == NULL || s == NULL)
1038                 break;
1039             *r = '\0';
1040             *s = '\0';
1041             if (strcmp (p, q) != 0)
1042             {
1043                 *r = PATH_SEP;
1044                 *s = PATH_SEP;
1045                 break;
1046             }
1047
1048             *r = PATH_SEP;
1049             *s = PATH_SEP;
1050
1051             p = r + 1;
1052             q = s + 1;
1053         }
1054         p--;
1055         for (i = 0; (p = strchr (p + 1, PATH_SEP)) != NULL; i++)
1056             ;
1057         currlen = (i + 1) * 3 + strlen (q) + 1;
1058         if (j != 0)
1059         {
1060             if (currlen < prevlen)
1061                 g_free (buf);
1062             else
1063                 goto ret;
1064         }
1065         p = buf = g_malloc (currlen);
1066         prevlen = currlen;
1067         for (; i >= 0; i--, p += 3)
1068             strcpy (p, "../");
1069         strcpy (p, q);
1070     }
1071
1072   ret:
1073     g_free (my_first);
1074     g_free (my_second);
1075     return buf;
1076 }
1077
1078 /* --------------------------------------------------------------------------------------------- */
1079 /**
1080  * Append text to GList, remove all entries with the same text
1081  */
1082
1083 GList *
1084 list_append_unique (GList * list, char *text)
1085 {
1086     GList *lc_link;
1087
1088     /*
1089      * Go to the last position and traverse the list backwards
1090      * starting from the second last entry to make sure that we
1091      * are not removing the current link.
1092      */
1093     list = g_list_append (list, text);
1094     list = g_list_last (list);
1095     lc_link = g_list_previous (list);
1096
1097     while (lc_link != NULL)
1098     {
1099         GList *newlink;
1100
1101         newlink = g_list_previous (lc_link);
1102         if (strcmp ((char *) lc_link->data, text) == 0)
1103         {
1104             GList *tmp;
1105
1106             g_free (lc_link->data);
1107             tmp = g_list_remove_link (list, lc_link);
1108             (void) tmp;
1109             g_list_free_1 (lc_link);
1110         }
1111         lc_link = newlink;
1112     }
1113
1114     return list;
1115 }
1116
1117 /* --------------------------------------------------------------------------------------------- */
1118 /**
1119  * Read and restore position for the given filename.
1120  * If there is no stored data, return line 1 and col 0.
1121  */
1122
1123 void
1124 load_file_position (const vfs_path_t * filename_vpath, long *line, long *column, off_t * offset,
1125                     GArray ** bookmarks)
1126 {
1127     char *fn;
1128     FILE *f;
1129     char buf[MC_MAXPATHLEN + 100];
1130     const size_t len = vfs_path_len (filename_vpath);
1131
1132     /* defaults */
1133     *line = 1;
1134     *column = 0;
1135     *offset = 0;
1136
1137     /* open file with positions */
1138     fn = mc_config_get_full_path (MC_FILEPOS_FILE);
1139     f = fopen (fn, "r");
1140     g_free (fn);
1141     if (f == NULL)
1142         return;
1143
1144     /* prepare array for serialized bookmarks */
1145     if (bookmarks != NULL)
1146         *bookmarks = g_array_sized_new (FALSE, FALSE, sizeof (size_t), MAX_SAVED_BOOKMARKS);
1147
1148     while (fgets (buf, sizeof (buf), f) != NULL)
1149     {
1150         const char *p;
1151         gchar **pos_tokens;
1152
1153         /* check if the filename matches the beginning of string */
1154         if (strncmp (buf, vfs_path_as_str (filename_vpath), len) != 0)
1155             continue;
1156
1157         /* followed by single space */
1158         if (buf[len] != ' ')
1159             continue;
1160
1161         /* and string without spaces */
1162         p = &buf[len + 1];
1163         if (strchr (p, ' ') != NULL)
1164             continue;
1165
1166         pos_tokens = g_strsplit (p, ";", 3 + MAX_SAVED_BOOKMARKS);
1167         if (pos_tokens[0] == NULL)
1168         {
1169             *line = 1;
1170             *column = 0;
1171             *offset = 0;
1172         }
1173         else
1174         {
1175             *line = strtol (pos_tokens[0], NULL, 10);
1176             if (pos_tokens[1] == NULL)
1177             {
1178                 *column = 0;
1179                 *offset = 0;
1180             }
1181             else
1182             {
1183                 *column = strtol (pos_tokens[1], NULL, 10);
1184                 if (pos_tokens[2] == NULL)
1185                     *offset = 0;
1186                 else if (bookmarks != NULL)
1187                 {
1188                     size_t i;
1189
1190                     *offset = (off_t) g_ascii_strtoll (pos_tokens[2], NULL, 10);
1191
1192                     for (i = 0; i < MAX_SAVED_BOOKMARKS && pos_tokens[3 + i] != NULL; i++)
1193                     {
1194                         size_t val;
1195
1196                         val = strtoul (pos_tokens[3 + i], NULL, 10);
1197                         g_array_append_val (*bookmarks, val);
1198                     }
1199                 }
1200             }
1201         }
1202
1203         g_strfreev (pos_tokens);
1204     }
1205
1206     fclose (f);
1207 }
1208
1209 /* --------------------------------------------------------------------------------------------- */
1210 /**
1211  * Save position for the given file
1212  */
1213
1214 void
1215 save_file_position (const vfs_path_t * filename_vpath, long line, long column, off_t offset,
1216                     GArray * bookmarks)
1217 {
1218     static size_t filepos_max_saved_entries = 0;
1219     char *fn, *tmp_fn;
1220     FILE *f, *tmp_f;
1221     char buf[MC_MAXPATHLEN + 100];
1222     size_t i;
1223     const size_t len = vfs_path_len (filename_vpath);
1224     gboolean src_error = FALSE;
1225
1226     if (filepos_max_saved_entries == 0)
1227         filepos_max_saved_entries = mc_config_get_int (mc_global.main_config, CONFIG_APP_SECTION,
1228                                                        "filepos_max_saved_entries", 1024);
1229
1230     fn = mc_config_get_full_path (MC_FILEPOS_FILE);
1231     if (fn == NULL)
1232         goto early_error;
1233
1234     mc_util_make_backup_if_possible (fn, TMP_SUFFIX);
1235
1236     /* open file */
1237     f = fopen (fn, "w");
1238     if (f == NULL)
1239         goto open_target_error;
1240
1241     tmp_fn = g_strdup_printf ("%s" TMP_SUFFIX, fn);
1242     tmp_f = fopen (tmp_fn, "r");
1243     if (tmp_f == NULL)
1244     {
1245         src_error = TRUE;
1246         goto open_source_error;
1247     }
1248
1249     /* put the new record */
1250     if (line != 1 || column != 0 || bookmarks != NULL)
1251     {
1252         if (fprintf
1253             (f, "%s %ld;%ld;%" PRIuMAX, vfs_path_as_str (filename_vpath), line, column,
1254              (uintmax_t) offset) < 0)
1255             goto write_position_error;
1256         if (bookmarks != NULL)
1257             for (i = 0; i < bookmarks->len && i < MAX_SAVED_BOOKMARKS; i++)
1258                 if (fprintf (f, ";%zu", g_array_index (bookmarks, size_t, i)) < 0)
1259                     goto write_position_error;
1260
1261         if (fprintf (f, "\n") < 0)
1262             goto write_position_error;
1263     }
1264
1265     i = 1;
1266     while (fgets (buf, sizeof (buf), tmp_f) != NULL)
1267     {
1268         if (buf[len] == ' ' && strncmp (buf, vfs_path_as_str (filename_vpath), len) == 0
1269             && strchr (&buf[len + 1], ' ') == NULL)
1270             continue;
1271
1272         fprintf (f, "%s", buf);
1273         if (++i > filepos_max_saved_entries)
1274             break;
1275     }
1276
1277   write_position_error:
1278     fclose (tmp_f);
1279   open_source_error:
1280     g_free (tmp_fn);
1281     fclose (f);
1282     if (src_error)
1283         mc_util_restore_from_backup_if_possible (fn, TMP_SUFFIX);
1284     else
1285         mc_util_unlink_backup_if_possible (fn, TMP_SUFFIX);
1286   open_target_error:
1287     g_free (fn);
1288   early_error:
1289     if (bookmarks != NULL)
1290         g_array_free (bookmarks, TRUE);
1291 }
1292
1293 /* --------------------------------------------------------------------------------------------- */
1294
1295 extern int
1296 ascii_alpha_to_cntrl (int ch)
1297 {
1298     if ((ch >= ASCII_A && ch <= ASCII_Z) || (ch >= ASCII_a && ch <= ASCII_z))
1299     {
1300         ch &= 0x1f;
1301     }
1302     return ch;
1303 }
1304
1305 /* --------------------------------------------------------------------------------------------- */
1306
1307 const char *
1308 Q_ (const char *s)
1309 {
1310     const char *result, *sep;
1311
1312     result = _(s);
1313     sep = strchr (result, '|');
1314     return (sep != NULL) ? sep + 1 : result;
1315 }
1316
1317 /* --------------------------------------------------------------------------------------------- */
1318
1319 gboolean
1320 mc_util_make_backup_if_possible (const char *file_name, const char *backup_suffix)
1321 {
1322     struct stat stat_buf;
1323     char *backup_path;
1324     gboolean ret;
1325     if (!exist_file (file_name))
1326         return FALSE;
1327
1328     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1329
1330     if (backup_path == NULL)
1331         return FALSE;
1332
1333     ret = mc_util_write_backup_content (file_name, backup_path);
1334
1335     if (ret)
1336     {
1337         /* Backup file will have same ownership with main file. */
1338         if (stat (file_name, &stat_buf) == 0)
1339             chmod (backup_path, stat_buf.st_mode);
1340         else
1341             chmod (backup_path, S_IRUSR | S_IWUSR);
1342     }
1343
1344     g_free (backup_path);
1345
1346     return ret;
1347 }
1348
1349 /* --------------------------------------------------------------------------------------------- */
1350
1351 gboolean
1352 mc_util_restore_from_backup_if_possible (const char *file_name, const char *backup_suffix)
1353 {
1354     gboolean ret;
1355     char *backup_path;
1356
1357     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1358     if (backup_path == NULL)
1359         return FALSE;
1360
1361     ret = mc_util_write_backup_content (backup_path, file_name);
1362     g_free (backup_path);
1363
1364     return ret;
1365 }
1366
1367 /* --------------------------------------------------------------------------------------------- */
1368
1369 gboolean
1370 mc_util_unlink_backup_if_possible (const char *file_name, const char *backup_suffix)
1371 {
1372     char *backup_path;
1373
1374     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1375     if (backup_path == NULL)
1376         return FALSE;
1377
1378     if (exist_file (backup_path))
1379     {
1380         vfs_path_t *vpath;
1381
1382         vpath = vfs_path_from_str (backup_path);
1383         mc_unlink (vpath);
1384         vfs_path_free (vpath);
1385     }
1386
1387     g_free (backup_path);
1388     return TRUE;
1389 }
1390
1391 /* --------------------------------------------------------------------------------------------- */
1392 /**
1393  * partly taken from dcigettext.c, returns "" for default locale
1394  * value should be freed by calling function g_free()
1395  */
1396
1397 char *
1398 guess_message_value (void)
1399 {
1400     static const char *const var[] = {
1401         /* Setting of LC_ALL overwrites all other.  */
1402         /* Do not use LANGUAGE for check user locale and drowing hints */
1403         "LC_ALL",
1404         /* Next comes the name of the desired category.  */
1405         "LC_MESSAGES",
1406         /* Last possibility is the LANG environment variable.  */
1407         "LANG",
1408         /* NULL exit loops */
1409         NULL
1410     };
1411
1412     unsigned i = 0;
1413     const char *locale = NULL;
1414
1415     while (var[i] != NULL)
1416     {
1417         locale = getenv (var[i]);
1418         if (locale != NULL && locale[0] != '\0')
1419             break;
1420         i++;
1421     }
1422
1423     if (locale == NULL)
1424         locale = "";
1425
1426     return g_strdup (locale);
1427 }
1428
1429 /* --------------------------------------------------------------------------------------------- */
1430 /**
1431  * Propagate error in simple way.
1432  *
1433  * @param dest error return location
1434  * @param code error code
1435  * @param format printf()-style format for error message
1436  * @param ... parameters for message format
1437  */
1438
1439 void
1440 mc_propagate_error (GError ** dest, int code, const char *format, ...)
1441 {
1442     if (dest != NULL && *dest == NULL)
1443     {
1444         GError *tmp_error;
1445         va_list args;
1446
1447         va_start (args, format);
1448         tmp_error = g_error_new_valist (MC_ERROR, code, format, args);
1449         va_end (args);
1450
1451         g_propagate_error (dest, tmp_error);
1452     }
1453 }
1454
1455 /* --------------------------------------------------------------------------------------------- */
1456 /**
1457  * Replace existing error in simple way.
1458  *
1459  * @param dest error return location
1460  * @param code error code
1461  * @param format printf()-style format for error message
1462  * @param ... parameters for message format
1463  */
1464
1465 void
1466 mc_replace_error (GError ** dest, int code, const char *format, ...)
1467 {
1468     if (dest != NULL)
1469     {
1470         GError *tmp_error;
1471         va_list args;
1472
1473         va_start (args, format);
1474         tmp_error = g_error_new_valist (MC_ERROR, code, format, args);
1475         va_end (args);
1476
1477         g_error_free (*dest);
1478         *dest = NULL;
1479         g_propagate_error (dest, tmp_error);
1480     }
1481 }
1482
1483 /* --------------------------------------------------------------------------------------------- */
1484
1485 /**
1486  * Returns if the given duration has elapsed since the given timestamp,
1487  * and if it has then updates the timestamp.
1488  *
1489  * @param timestamp the last timestamp in microseconds, updated if the given time elapsed
1490  * @param deleay amount of time in microseconds
1491
1492  * @return TRUE if clock skew detected, FALSE otherwise
1493  */
1494 gboolean
1495 mc_time_elapsed (guint64 * timestamp, guint64 delay)
1496 {
1497     guint64 now;
1498
1499     now = mc_timer_elapsed (mc_global.timer);
1500
1501     if (now >= *timestamp && now < *timestamp + delay)
1502         return FALSE;
1503
1504     *timestamp = now;
1505     return TRUE;
1506 }
1507
1508 /* --------------------------------------------------------------------------------------------- */