lib/util.c

   1 /*
   2    Various utilities
   3
   4    Copyright (C) 1994-2022
   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 <stddef.h>             /* ptrdiff_t */
  39 #include <limits.h>
  40 #include <stdarg.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.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
  55 /*** global variables ****************************************************************************/
  56
  57 /*** file scope macro definitions ****************************************************************/
  58
  59 #define ismode(n,m) ((n & m) == m)
  60
  61 /* Number of attempts to create a temporary file */
  62 #ifndef TMP_MAX
  63 #define TMP_MAX 16384
  64 #endif /* !TMP_MAX */
  65
  66 #define TMP_SUFFIX ".tmp"
  67
  68 #define ASCII_A (0x40 + 1)
  69 #define ASCII_Z (0x40 + 26)
  70 #define ASCII_a (0x60 + 1)
  71 #define ASCII_z (0x60 + 26)
  72
  73 /*** file scope type declarations ****************************************************************/
  74
  75 /*** file scope variables ************************************************************************/
  76
  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 == NULL)
 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     {
 209         int ret2;
 210
 211         /* cppcheck-suppress redundantAssignment */
 212         ret2 = fflush (backup_fd);
 213         /* cppcheck-suppress redundantAssignment */
 214         ret2 = fclose (backup_fd);
 215         (void) ret2;
 216     }
 217
 218     g_free (contents);
 219     return ret1;
 220 }
 221
 222 /* --------------------------------------------------------------------------------------------- */
 223 /*** public functions ****************************************************************************/
 224 /* --------------------------------------------------------------------------------------------- */
 225
 226 int
 227 is_printable (int c)
 228 {
 229     c &= 0xff;
 230
 231 #ifdef HAVE_CHARSET
 232     /* "Display bits" is ignored, since the user controls the output
 233        by setting the output codepage */
 234     return is_8bit_printable (c);
 235 #else
 236     if (!mc_global.eight_bit_clean)
 237         return is_7bit_printable (c);
 238
 239     if (mc_global.full_eight_bits)
 240         return is_8bit_printable (c);
 241
 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, TRUE);
 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     /* @size format is "size unit", i.e. "[digits][space][letters]".
 387        Copy all charactes after digits. */
 388     while (p >= y && !g_ascii_isdigit (*p))
 389         *d-- = *p--;
 390     for (count = 0; p >= y; count++)
 391     {
 392         if (count == 3)
 393         {
 394             *d-- = ',';
 395             count = 0;
 396         }
 397         *d-- = *p--;
 398     }
 399     d++;
 400     if (*d == ',')
 401         d++;
 402     return d;
 403 }
 404
 405 /* --------------------------------------------------------------------------------------------- */
 406 /**
 407  * Print file SIZE to BUFFER, but don't exceed LEN characters,
 408  * not including trailing 0. BUFFER should be at least LEN+1 long.
 409  * This function is called for every file on panels, so avoid
 410  * floating point by any means.
 411  *
 412  * Units: size units (filesystem sizes are 1K blocks)
 413  *    0=bytes, 1=Kbytes, 2=Mbytes, etc.
 414  */
 415
 416 void
 417 size_trunc_len (char *buffer, unsigned int len, uintmax_t size, int units, gboolean use_si)
 418 {
 419     /* Avoid taking power for every file.  */
 420     /* *INDENT-OFF* */
 421     static const uintmax_t power10[] = {
 422     /* we hope that size of uintmax_t is 4 bytes at least */
 423         1ULL,
 424         10ULL,
 425         100ULL,
 426         1000ULL,
 427         10000ULL,
 428         100000ULL,
 429         1000000ULL,
 430         10000000ULL,
 431         100000000ULL,
 432         1000000000ULL
 433     /* maximum value of uintmax_t (in case of 4 bytes) is
 434         4294967295
 435      */
 436 #if SIZEOF_UINTMAX_T == 8
 437                      ,
 438         10000000000ULL,
 439         100000000000ULL,
 440         1000000000000ULL,
 441         10000000000000ULL,
 442         100000000000000ULL,
 443         1000000000000000ULL,
 444         10000000000000000ULL,
 445         100000000000000000ULL,
 446         1000000000000000000ULL,
 447         10000000000000000000ULL
 448     /* maximum value of uintmax_t (in case of 8 bytes) is
 449         18447644073710439615
 450      */
 451 #endif
 452     };
 453     /* *INDENT-ON* */
 454     static const char *const suffix[] = { "", "K", "M", "G", "T", "P", "E", "Z", "Y", NULL };
 455     static const char *const suffix_lc[] = { "", "k", "m", "g", "t", "p", "e", "z", "y", NULL };
 456
 457     const char *const *sfx = use_si ? suffix_lc : suffix;
 458     int j = 0;
 459
 460     if (len == 0)
 461         len = 9;
 462 #if SIZEOF_UINTMAX_T == 8
 463     /* 20 decimal digits are required to represent 8 bytes */
 464     else if (len > 19)
 465         len = 19;
 466 #else
 467     /* 10 decimal digits are required to represent 4 bytes */
 468     else if (len > 9)
 469         len = 9;
 470 #endif
 471
 472     /*
 473      * recalculate from 1024 base to 1000 base if units>0
 474      * We can't just multiply by 1024 - that might cause overflow
 475      * if uintmax_t type is too small
 476      */
 477     if (use_si)
 478         for (j = 0; j < units; j++)
 479         {
 480             uintmax_t size_remain;
 481
 482             size_remain = ((size % 125) * 1024) / 1000; /* size mod 125, recalculated */
 483             size /= 125;        /* 128/125 = 1024/1000 */
 484             size *= 128;        /* This will convert size from multiple of 1024 to multiple of 1000 */
 485             size += size_remain;        /* Re-add remainder lost by division/multiplication */
 486         }
 487
 488     for (j = units; sfx[j] != NULL; j++)
 489     {
 490         if (size == 0)
 491         {
 492             if (j == units)
 493             {
 494                 /* Empty files will print "0" even with minimal width.  */
 495                 g_snprintf (buffer, len + 1, "%s", "0");
 496             }
 497             else
 498             {
 499                 /* Use "~K" or just "K" if len is 1.  Use "B" for bytes.  */
 500                 g_snprintf (buffer, len + 1, (len > 1) ? "~%s" : "%s", (j > 1) ? sfx[j - 1] : "B");
 501             }
 502             break;
 503         }
 504
 505         if (size < power10[len - (j > 0 ? 1 : 0)])
 506         {
 507             g_snprintf (buffer, len + 1, "%" PRIuMAX "%s", size, sfx[j]);
 508             break;
 509         }
 510
 511         /* Powers of 1000 or 1024, with rounding.  */
 512         if (use_si)
 513             size = (size + 500) / 1000;
 514         else
 515             size = (size + 512) >> 10;
 516     }
 517 }
 518
 519 /* --------------------------------------------------------------------------------------------- */
 520
 521 const char *
 522 string_perm (mode_t mode_bits)
 523 {
 524     static char mode[11];
 525
 526     strcpy (mode, "----------");
 527     if (S_ISDIR (mode_bits))
 528         mode[0] = 'd';
 529     if (S_ISCHR (mode_bits))
 530         mode[0] = 'c';
 531     if (S_ISBLK (mode_bits))
 532         mode[0] = 'b';
 533     if (S_ISLNK (mode_bits))
 534         mode[0] = 'l';
 535     if (S_ISFIFO (mode_bits))
 536         mode[0] = 'p';
 537     if (S_ISNAM (mode_bits))
 538         mode[0] = 'n';
 539     if (S_ISSOCK (mode_bits))
 540         mode[0] = 's';
 541     if (S_ISDOOR (mode_bits))
 542         mode[0] = 'D';
 543     if (ismode (mode_bits, S_IXOTH))
 544         mode[9] = 'x';
 545     if (ismode (mode_bits, S_IWOTH))
 546         mode[8] = 'w';
 547     if (ismode (mode_bits, S_IROTH))
 548         mode[7] = 'r';
 549     if (ismode (mode_bits, S_IXGRP))
 550         mode[6] = 'x';
 551     if (ismode (mode_bits, S_IWGRP))
 552         mode[5] = 'w';
 553     if (ismode (mode_bits, S_IRGRP))
 554         mode[4] = 'r';
 555     if (ismode (mode_bits, S_IXUSR))
 556         mode[3] = 'x';
 557     if (ismode (mode_bits, S_IWUSR))
 558         mode[2] = 'w';
 559     if (ismode (mode_bits, S_IRUSR))
 560         mode[1] = 'r';
 561 #ifdef S_ISUID
 562     if (ismode (mode_bits, S_ISUID))
 563         mode[3] = (mode[3] == 'x') ? 's' : 'S';
 564 #endif /* S_ISUID */
 565 #ifdef S_ISGID
 566     if (ismode (mode_bits, S_ISGID))
 567         mode[6] = (mode[6] == 'x') ? 's' : 'S';
 568 #endif /* S_ISGID */
 569 #ifdef S_ISVTX
 570     if (ismode (mode_bits, S_ISVTX))
 571         mode[9] = (mode[9] == 'x') ? 't' : 'T';
 572 #endif /* S_ISVTX */
 573     return mode;
 574 }
 575
 576 /* --------------------------------------------------------------------------------------------- */
 577
 578 const char *
 579 extension (const char *filename)
 580 {
 581     const char *d;
 582
 583     d = strrchr (filename, '.');
 584
 585     return d != NULL ? d + 1 : "";
 586 }
 587
 588 /* --------------------------------------------------------------------------------------------- */
 589
 590 char *
 591 load_mc_home_file (const char *from, const char *filename, char **allocated_filename,
 592                    size_t * length)
 593 {
 594     char *hintfile_base, *hintfile;
 595     char *lang;
 596     char *data;
 597
 598     hintfile_base = g_build_filename (from, filename, (char *) NULL);
 599     lang = guess_message_value ();
 600
 601     hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 602     if (!g_file_get_contents (hintfile, &data, length, NULL))
 603     {
 604         /* Fall back to the two-letter language code */
 605         if (lang[0] != '\0' && lang[1] != '\0')
 606             lang[2] = '\0';
 607         g_free (hintfile);
 608         hintfile = g_strconcat (hintfile_base, ".", lang, (char *) NULL);
 609         if (!g_file_get_contents (hintfile, &data, length, NULL))
 610         {
 611             g_free (hintfile);
 612             hintfile = hintfile_base;
 613             g_file_get_contents (hintfile_base, &data, length, NULL);
 614         }
 615     }
 616
 617     g_free (lang);
 618
 619     if (hintfile != hintfile_base)
 620         g_free (hintfile_base);
 621
 622     if (allocated_filename != NULL)
 623         *allocated_filename = hintfile;
 624     else
 625         g_free (hintfile);
 626
 627     return data;
 628 }
 629
 630 /* --------------------------------------------------------------------------------------------- */
 631
 632 const char *
 633 extract_line (const char *s, const char *top)
 634 {
 635     static char tmp_line[BUF_MEDIUM];
 636     char *t = tmp_line;
 637
 638     while (*s != '\0' && *s != '\n' && (size_t) (t - tmp_line) < sizeof (tmp_line) - 1 && s < top)
 639         *t++ = *s++;
 640     *t = '\0';
 641     return tmp_line;
 642 }
 643
 644 /* --------------------------------------------------------------------------------------------- */
 645 /**
 646  * The basename routine
 647  */
 648
 649 const char *
 650 x_basename (const char *s)
 651 {
 652     const char *url_delim, *path_sep;
 653
 654     url_delim = g_strrstr (s, VFS_PATH_URL_DELIMITER);
 655     path_sep = strrchr (s, PATH_SEP);
 656
 657     if (path_sep == NULL)
 658         return s;
 659
 660     if (url_delim == NULL
 661         || url_delim < path_sep - strlen (VFS_PATH_URL_DELIMITER)
 662         || url_delim - s + strlen (VFS_PATH_URL_DELIMITER) < strlen (s))
 663     {
 664         /* avoid trailing PATH_SEP, if present */
 665         if (!IS_PATH_SEP (s[strlen (s) - 1]))
 666             return path_sep + 1;
 667
 668         while (--path_sep > s && !IS_PATH_SEP (*path_sep))
 669             ;
 670         return (path_sep != s) ? path_sep + 1 : s;
 671     }
 672
 673     while (--url_delim > s && !IS_PATH_SEP (*url_delim))
 674         ;
 675     while (--url_delim > s && !IS_PATH_SEP (*url_delim))
 676         ;
 677
 678     return url_delim == s ? s : url_delim + 1;
 679 }
 680
 681 /* --------------------------------------------------------------------------------------------- */
 682
 683 const char *
 684 unix_error_string (int error_num)
 685 {
 686     static char buffer[BUF_LARGE];
 687     gchar *strerror_currentlocale;
 688
 689     strerror_currentlocale = g_locale_from_utf8 (g_strerror (error_num), -1, NULL, NULL, NULL);
 690     g_snprintf (buffer, sizeof (buffer), "%s (%d)", strerror_currentlocale, error_num);
 691     g_free (strerror_currentlocale);
 692
 693     return buffer;
 694 }
 695
 696 /* --------------------------------------------------------------------------------------------- */
 697
 698 const char *
 699 skip_separators (const char *s)
 700 {
 701     const char *su = s;
 702
 703     for (; *su != '\0'; str_cnext_char (&su))
 704         if (!whitespace (*su) && *su != ',')
 705             break;
 706
 707     return su;
 708 }
 709
 710 /* --------------------------------------------------------------------------------------------- */
 711
 712 const char *
 713 skip_numbers (const char *s)
 714 {
 715     const char *su = s;
 716
 717     for (; *su != '\0'; str_cnext_char (&su))
 718         if (!str_isdigit (su))
 719             break;
 720
 721     return su;
 722 }
 723
 724 /* --------------------------------------------------------------------------------------------- */
 725 /**
 726  * Remove all control sequences from the argument string.  We define
 727  * "control sequence", in a sort of pidgin BNF, as follows:
 728  *
 729  * control-seq = Esc non-'['
 730  *             | Esc '[' (0 or more digits or ';' or ':' or '?') (any other char)
 731  *
 732  * The 256-color and true-color escape sequences should allow either ';' or ':' inside as separator,
 733  * actually, ':' is the more correct according to ECMA-48.
 734  * Some terminal emulators (e.g. xterm, gnome-terminal) support this.
 735  *
 736  * Non-printable characters are also removed.
 737  */
 738
 739 char *
 740 strip_ctrl_codes (char *s)
 741 {
 742     char *w;                    /* Current position where the stripped data is written */
 743     char *r;                    /* Current position where the original data is read */
 744
 745     if (s == NULL)
 746         return NULL;
 747
 748     for (w = s, r = s; *r != '\0';)
 749     {
 750         if (*r == ESC_CHAR)
 751         {
 752             /* Skip the control sequence's arguments */ ;
 753             /* '(' need to avoid strange 'B' letter in *Suse (if mc runs under root user) */
 754             if (*(++r) == '[' || *r == '(')
 755             {
 756                 /* strchr() matches trailing binary 0 */
 757                 while (*(++r) != '\0' && strchr ("0123456789;:?", *r) != NULL)
 758                     ;
 759             }
 760             else if (*r == ']')
 761             {
 762                 /*
 763                  * Skip xterm's OSC (Operating System Command)
 764                  * http://www.xfree86.org/current/ctlseqs.html
 765                  * OSC P s ; P t ST
 766                  * OSC P s ; P t BEL
 767                  */
 768                 char *new_r;
 769
 770                 for (new_r = r; *new_r != '\0'; new_r++)
 771                 {
 772                     switch (*new_r)
 773                     {
 774                         /* BEL */
 775                     case '\a':
 776                         r = new_r;
 777                         goto osc_out;
 778                     case ESC_CHAR:
 779                         /* ST */
 780                         if (new_r[1] == '\\')
 781                         {
 782                             r = new_r + 1;
 783                             goto osc_out;
 784                         }
 785                         break;
 786                     default:
 787                         break;
 788                     }
 789                 }
 790               osc_out:
 791                 ;
 792             }
 793
 794             /*
 795              * Now we are at the last character of the sequence.
 796              * Skip it unless it's binary 0.
 797              */
 798             if (*r != '\0')
 799                 r++;
 800         }
 801         else
 802         {
 803             char *n;
 804
 805             n = str_get_next_char (r);
 806             if (str_isprint (r))
 807             {
 808                 memmove (w, r, n - r);
 809                 w += n - r;
 810             }
 811             r = n;
 812         }
 813     }
 814
 815     *w = '\0';
 816     return s;
 817 }
 818
 819 /* --------------------------------------------------------------------------------------------- */
 820
 821 enum compression_type
 822 get_compression_type (int fd, const char *name)
 823 {
 824     unsigned char magic[16];
 825     size_t str_len;
 826
 827     /* Read the magic signature */
 828     if (mc_read (fd, (char *) magic, 4) != 4)
 829         return COMPRESSION_NONE;
 830
 831     /* GZIP_MAGIC and OLD_GZIP_MAGIC */
 832     if (magic[0] == 037 && (magic[1] == 0213 || magic[1] == 0236))
 833         return COMPRESSION_GZIP;
 834
 835     /* PKZIP_MAGIC */
 836     if (magic[0] == 0120 && magic[1] == 0113 && magic[2] == 003 && magic[3] == 004)
 837     {
 838         /* Read compression type */
 839         mc_lseek (fd, 8, SEEK_SET);
 840         if (mc_read (fd, (char *) magic, 2) != 2)
 841             return COMPRESSION_NONE;
 842
 843         /* Gzip can handle only deflated (8) or stored (0) files */
 844         if ((magic[0] != 8 && magic[0] != 0) || magic[1] != 0)
 845             return COMPRESSION_NONE;
 846
 847         /* Compatible with gzip */
 848         return COMPRESSION_GZIP;
 849     }
 850
 851     /* PACK_MAGIC and LZH_MAGIC and compress magic */
 852     if (magic[0] == 037 && (magic[1] == 036 || magic[1] == 0240 || magic[1] == 0235))
 853         /* Compatible with gzip */
 854         return COMPRESSION_GZIP;
 855
 856     /* BZIP and BZIP2 files */
 857     if ((magic[0] == 'B') && (magic[1] == 'Z') && (magic[3] >= '1') && (magic[3] <= '9'))
 858         switch (magic[2])
 859         {
 860         case '0':
 861             return COMPRESSION_BZIP;
 862         case 'h':
 863             return COMPRESSION_BZIP2;
 864         default:
 865             break;
 866         }
 867
 868     /* LZ4 format - v1.5.0 - 0x184D2204 (little endian) */
 869     if (magic[0] == 0x04 && magic[1] == 0x22 && magic[2] == 0x4d && magic[3] == 0x18)
 870         return COMPRESSION_LZ4;
 871
 872     if (mc_read (fd, (char *) magic + 4, 2) != 2)
 873         return COMPRESSION_NONE;
 874
 875     /* LZIP files */
 876     if (magic[0] == 'L'
 877         && magic[1] == 'Z'
 878         && magic[2] == 'I' && magic[3] == 'P' && (magic[4] == 0x00 || magic[4] == 0x01))
 879         return COMPRESSION_LZIP;
 880
 881     /* Support for LZMA (only utils format with magic in header).
 882      * This is the default format of LZMA utils 4.32.1 and later. */
 883     if (magic[0] == 0xFF
 884         && magic[1] == 'L'
 885         && magic[2] == 'Z' && magic[3] == 'M' && magic[4] == 'A' && magic[5] == 0x00)
 886         return COMPRESSION_LZMA;
 887
 888     /* XZ compression magic */
 889     if (magic[0] == 0xFD
 890         && magic[1] == 0x37
 891         && magic[2] == 0x7A && magic[3] == 0x58 && magic[4] == 0x5A && magic[5] == 0x00)
 892         return COMPRESSION_XZ;
 893
 894     if (magic[0] == 0x28 && magic[1] == 0xB5 && magic[2] == 0x2F && magic[3] == 0xFD)
 895         return COMPRESSION_ZSTD;
 896
 897     str_len = strlen (name);
 898     /* HACK: we must belive to extension of LZMA file :) ... */
 899     if ((str_len > 5 && strcmp (&name[str_len - 5], ".lzma") == 0) ||
 900         (str_len > 4 && strcmp (&name[str_len - 4], ".tlz") == 0))
 901         return COMPRESSION_LZMA;
 902
 903     return COMPRESSION_NONE;
 904 }
 905
 906 /* --------------------------------------------------------------------------------------------- */
 907
 908 const char *
 909 decompress_extension (int type)
 910 {
 911     switch (type)
 912     {
 913     case COMPRESSION_GZIP:
 914         return "/ugz" VFS_PATH_URL_DELIMITER;
 915     case COMPRESSION_BZIP:
 916         return "/ubz" VFS_PATH_URL_DELIMITER;
 917     case COMPRESSION_BZIP2:
 918         return "/ubz2" VFS_PATH_URL_DELIMITER;
 919     case COMPRESSION_LZIP:
 920         return "/ulz" VFS_PATH_URL_DELIMITER;
 921     case COMPRESSION_LZ4:
 922         return "/ulz4" VFS_PATH_URL_DELIMITER;
 923     case COMPRESSION_LZMA:
 924         return "/ulzma" VFS_PATH_URL_DELIMITER;
 925     case COMPRESSION_XZ:
 926         return "/uxz" VFS_PATH_URL_DELIMITER;
 927     case COMPRESSION_ZSTD:
 928         return "/uzst" VFS_PATH_URL_DELIMITER;
 929     default:
 930         break;
 931     }
 932     /* Should never reach this place */
 933     fprintf (stderr, "Fatal: decompress_extension called with an unknown argument\n");
 934     return 0;
 935 }
 936
 937 /* --------------------------------------------------------------------------------------------- */
 938
 939 void
 940 wipe_password (char *passwd)
 941 {
 942     if (passwd != NULL)
 943     {
 944         char *p;
 945
 946         for (p = passwd; *p != '\0'; p++)
 947             *p = '\0';
 948         g_free (passwd);
 949     }
 950 }
 951
 952 /* --------------------------------------------------------------------------------------------- */
 953 /**
 954  * Convert "\E" -> esc character and ^x to control-x key and ^^ to ^ key
 955  *
 956  * @param p pointer to string
 957  *
 958  * @return newly allocated string
 959  */
 960
 961 char *
 962 convert_controls (const char *p)
 963 {
 964     char *valcopy;
 965     char *q;
 966
 967     valcopy = g_strdup (p);
 968
 969     /* Parse the escape special character */
 970     for (q = valcopy; *p != '\0';)
 971         switch (*p)
 972         {
 973         case '\\':
 974             p++;
 975
 976             if (*p == 'e' || *p == 'E')
 977             {
 978                 p++;
 979                 *q++ = ESC_CHAR;
 980             }
 981             break;
 982
 983         case '^':
 984             p++;
 985             if (*p == '^')
 986                 *q++ = *p++;
 987             else
 988             {
 989                 char c;
 990
 991                 c = *p | 0x20;
 992                 if (c >= 'a' && c <= 'z')
 993                 {
 994                     *q++ = c - 'a' + 1;
 995                     p++;
 996                 }
 997                 else if (*p != '\0')
 998                     p++;
 999             }
1000             break;
1001
1002         default:
1003             *q++ = *p++;
1004         }
1005
1006     *q = '\0';
1007     return valcopy;
1008 }
1009
1010 /* --------------------------------------------------------------------------------------------- */
1011 /**
1012  * Finds out a relative path from first to second, i.e. goes as many ..
1013  * as needed up in first and then goes down using second
1014  */
1015
1016 char *
1017 diff_two_paths (const vfs_path_t * vpath1, const vfs_path_t * vpath2)
1018 {
1019     int j, prevlen = -1, currlen;
1020     char *my_first = NULL, *my_second = NULL;
1021     char *buf = NULL;
1022
1023     my_first = resolve_symlinks (vpath1);
1024     if (my_first == NULL)
1025         goto ret;
1026
1027     my_second = resolve_symlinks (vpath2);
1028     if (my_second == NULL)
1029         goto ret;
1030
1031     for (j = 0; j < 2; j++)
1032     {
1033         char *p, *q;
1034         int i;
1035
1036         p = my_first;
1037         q = my_second;
1038
1039         while (TRUE)
1040         {
1041             char *r, *s;
1042             ptrdiff_t len;
1043
1044             r = strchr (p, PATH_SEP);
1045             if (r == NULL)
1046                 break;
1047             s = strchr (q, PATH_SEP);
1048             if (s == NULL)
1049                 break;
1050
1051             len = r - p;
1052             if (len != (s - q) || strncmp (p, q, (size_t) len) != 0)
1053                 break;
1054
1055             p = r + 1;
1056             q = s + 1;
1057         }
1058         p--;
1059         for (i = 0; (p = strchr (p + 1, PATH_SEP)) != NULL; i++)
1060             ;
1061         currlen = (i + 1) * 3 + strlen (q) + 1;
1062         if (j != 0)
1063         {
1064             if (currlen < prevlen)
1065                 g_free (buf);
1066             else
1067                 goto ret;
1068         }
1069         p = buf = g_malloc (currlen);
1070         prevlen = currlen;
1071         for (; i >= 0; i--, p += 3)
1072             strcpy (p, "../");
1073         strcpy (p, q);
1074     }
1075
1076   ret:
1077     g_free (my_first);
1078     g_free (my_second);
1079     return buf;
1080 }
1081
1082 /* --------------------------------------------------------------------------------------------- */
1083 /**
1084  * Append text to GList, remove all entries with the same text
1085  */
1086
1087 GList *
1088 list_append_unique (GList * list, char *text)
1089 {
1090     GList *lc_link;
1091
1092     /*
1093      * Go to the last position and traverse the list backwards
1094      * starting from the second last entry to make sure that we
1095      * are not removing the current link.
1096      */
1097     list = g_list_append (list, text);
1098     list = g_list_last (list);
1099     lc_link = g_list_previous (list);
1100
1101     while (lc_link != NULL)
1102     {
1103         GList *newlink;
1104
1105         newlink = g_list_previous (lc_link);
1106         if (strcmp ((char *) lc_link->data, text) == 0)
1107         {
1108             GList *tmp;
1109
1110             g_free (lc_link->data);
1111             tmp = g_list_remove_link (list, lc_link);
1112             (void) tmp;
1113             g_list_free_1 (lc_link);
1114         }
1115         lc_link = newlink;
1116     }
1117
1118     return list;
1119 }
1120
1121 /* --------------------------------------------------------------------------------------------- */
1122 /**
1123  * Read and restore position for the given filename.
1124  * If there is no stored data, return line 1 and col 0.
1125  */
1126
1127 void
1128 load_file_position (const vfs_path_t * filename_vpath, long *line, long *column, off_t * offset,
1129                     GArray ** bookmarks)
1130 {
1131     char *fn;
1132     FILE *f;
1133     char buf[MC_MAXPATHLEN + 100];
1134     const size_t len = vfs_path_len (filename_vpath);
1135
1136     /* defaults */
1137     *line = 1;
1138     *column = 0;
1139     *offset = 0;
1140
1141     /* open file with positions */
1142     fn = mc_config_get_full_path (MC_FILEPOS_FILE);
1143     f = fopen (fn, "r");
1144     g_free (fn);
1145     if (f == NULL)
1146         return;
1147
1148     /* prepare array for serialized bookmarks */
1149     if (bookmarks != NULL)
1150         *bookmarks = g_array_sized_new (FALSE, FALSE, sizeof (size_t), MAX_SAVED_BOOKMARKS);
1151
1152     while (fgets (buf, sizeof (buf), f) != NULL)
1153     {
1154         const char *p;
1155         gchar **pos_tokens;
1156
1157         /* check if the filename matches the beginning of string */
1158         if (strncmp (buf, vfs_path_as_str (filename_vpath), len) != 0)
1159             continue;
1160
1161         /* followed by single space */
1162         if (buf[len] != ' ')
1163             continue;
1164
1165         /* and string without spaces */
1166         p = &buf[len + 1];
1167         if (strchr (p, ' ') != NULL)
1168             continue;
1169
1170         pos_tokens = g_strsplit (p, ";", 3 + MAX_SAVED_BOOKMARKS);
1171         if (pos_tokens[0] == NULL)
1172         {
1173             *line = 1;
1174             *column = 0;
1175             *offset = 0;
1176         }
1177         else
1178         {
1179             *line = strtol (pos_tokens[0], NULL, 10);
1180             if (pos_tokens[1] == NULL)
1181             {
1182                 *column = 0;
1183                 *offset = 0;
1184             }
1185             else
1186             {
1187                 *column = strtol (pos_tokens[1], NULL, 10);
1188                 if (pos_tokens[2] == NULL)
1189                     *offset = 0;
1190                 else if (bookmarks != NULL)
1191                 {
1192                     size_t i;
1193
1194                     *offset = (off_t) g_ascii_strtoll (pos_tokens[2], NULL, 10);
1195
1196                     for (i = 0; i < MAX_SAVED_BOOKMARKS && pos_tokens[3 + i] != NULL; i++)
1197                     {
1198                         size_t val;
1199
1200                         val = strtoul (pos_tokens[3 + i], NULL, 10);
1201                         g_array_append_val (*bookmarks, val);
1202                     }
1203                 }
1204             }
1205         }
1206
1207         g_strfreev (pos_tokens);
1208     }
1209
1210     fclose (f);
1211 }
1212
1213 /* --------------------------------------------------------------------------------------------- */
1214 /**
1215  * Save position for the given file
1216  */
1217
1218 void
1219 save_file_position (const vfs_path_t * filename_vpath, long line, long column, off_t offset,
1220                     GArray * bookmarks)
1221 {
1222     static size_t filepos_max_saved_entries = 0;
1223     char *fn, *tmp_fn;
1224     FILE *f, *tmp_f;
1225     char buf[MC_MAXPATHLEN + 100];
1226     size_t i;
1227     const size_t len = vfs_path_len (filename_vpath);
1228     gboolean src_error = FALSE;
1229
1230     if (filepos_max_saved_entries == 0)
1231         filepos_max_saved_entries = mc_config_get_int (mc_global.main_config, CONFIG_APP_SECTION,
1232                                                        "filepos_max_saved_entries", 1024);
1233
1234     fn = mc_config_get_full_path (MC_FILEPOS_FILE);
1235     if (fn == NULL)
1236         goto early_error;
1237
1238     mc_util_make_backup_if_possible (fn, TMP_SUFFIX);
1239
1240     /* open file */
1241     f = fopen (fn, "w");
1242     if (f == NULL)
1243         goto open_target_error;
1244
1245     tmp_fn = g_strdup_printf ("%s" TMP_SUFFIX, fn);
1246     tmp_f = fopen (tmp_fn, "r");
1247     if (tmp_f == NULL)
1248     {
1249         src_error = TRUE;
1250         goto open_source_error;
1251     }
1252
1253     /* put the new record */
1254     if (line != 1 || column != 0 || bookmarks != NULL)
1255     {
1256         if (fprintf
1257             (f, "%s %ld;%ld;%" PRIuMAX, vfs_path_as_str (filename_vpath), line, column,
1258              (uintmax_t) offset) < 0)
1259             goto write_position_error;
1260         if (bookmarks != NULL)
1261             for (i = 0; i < bookmarks->len && i < MAX_SAVED_BOOKMARKS; i++)
1262                 if (fprintf (f, ";%zu", g_array_index (bookmarks, size_t, i)) < 0)
1263                     goto write_position_error;
1264
1265         if (fprintf (f, "\n") < 0)
1266             goto write_position_error;
1267     }
1268
1269     i = 1;
1270     while (fgets (buf, sizeof (buf), tmp_f) != NULL)
1271     {
1272         if (buf[len] == ' ' && strncmp (buf, vfs_path_as_str (filename_vpath), len) == 0
1273             && strchr (&buf[len + 1], ' ') == NULL)
1274             continue;
1275
1276         fprintf (f, "%s", buf);
1277         if (++i > filepos_max_saved_entries)
1278             break;
1279     }
1280
1281   write_position_error:
1282     fclose (tmp_f);
1283   open_source_error:
1284     g_free (tmp_fn);
1285     fclose (f);
1286     if (src_error)
1287         mc_util_restore_from_backup_if_possible (fn, TMP_SUFFIX);
1288     else
1289         mc_util_unlink_backup_if_possible (fn, TMP_SUFFIX);
1290   open_target_error:
1291     g_free (fn);
1292   early_error:
1293     if (bookmarks != NULL)
1294         g_array_free (bookmarks, TRUE);
1295 }
1296
1297 /* --------------------------------------------------------------------------------------------- */
1298
1299 extern int
1300 ascii_alpha_to_cntrl (int ch)
1301 {
1302     if ((ch >= ASCII_A && ch <= ASCII_Z) || (ch >= ASCII_a && ch <= ASCII_z))
1303         ch &= 0x1f;
1304
1305     return ch;
1306 }
1307
1308 /* --------------------------------------------------------------------------------------------- */
1309
1310 const char *
1311 Q_ (const char *s)
1312 {
1313     const char *result, *sep;
1314
1315     result = _(s);
1316     sep = strchr (result, '|');
1317
1318     return sep != NULL ? sep + 1 : result;
1319 }
1320
1321 /* --------------------------------------------------------------------------------------------- */
1322
1323 gboolean
1324 mc_util_make_backup_if_possible (const char *file_name, const char *backup_suffix)
1325 {
1326     struct stat stat_buf;
1327     char *backup_path;
1328     gboolean ret;
1329
1330     if (!exist_file (file_name))
1331         return FALSE;
1332
1333     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1334     if (backup_path == NULL)
1335         return FALSE;
1336
1337     ret = mc_util_write_backup_content (file_name, backup_path);
1338     if (ret)
1339     {
1340         /* Backup file will have same ownership with main file. */
1341         if (stat (file_name, &stat_buf) == 0)
1342             chmod (backup_path, stat_buf.st_mode);
1343         else
1344             chmod (backup_path, S_IRUSR | S_IWUSR);
1345     }
1346
1347     g_free (backup_path);
1348
1349     return ret;
1350 }
1351
1352 /* --------------------------------------------------------------------------------------------- */
1353
1354 gboolean
1355 mc_util_restore_from_backup_if_possible (const char *file_name, const char *backup_suffix)
1356 {
1357     gboolean ret;
1358     char *backup_path;
1359
1360     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1361     if (backup_path == NULL)
1362         return FALSE;
1363
1364     ret = mc_util_write_backup_content (backup_path, file_name);
1365     g_free (backup_path);
1366
1367     return ret;
1368 }
1369
1370 /* --------------------------------------------------------------------------------------------- */
1371
1372 gboolean
1373 mc_util_unlink_backup_if_possible (const char *file_name, const char *backup_suffix)
1374 {
1375     char *backup_path;
1376
1377     backup_path = g_strdup_printf ("%s%s", file_name, backup_suffix);
1378     if (backup_path == NULL)
1379         return FALSE;
1380
1381     if (exist_file (backup_path))
1382     {
1383         vfs_path_t *vpath;
1384
1385         vpath = vfs_path_from_str (backup_path);
1386         mc_unlink (vpath);
1387         vfs_path_free (vpath, TRUE);
1388     }
1389
1390     g_free (backup_path);
1391     return TRUE;
1392 }
1393
1394 /* --------------------------------------------------------------------------------------------- */
1395 /**
1396  * partly taken from dcigettext.c, returns "" for default locale
1397  * value should be freed by calling function g_free()
1398  */
1399
1400 char *
1401 guess_message_value (void)
1402 {
1403     static const char *const var[] = {
1404         /* Setting of LC_ALL overwrites all other.  */
1405         /* Do not use LANGUAGE for check user locale and drowing hints */
1406         "LC_ALL",
1407         /* Next comes the name of the desired category.  */
1408         "LC_MESSAGES",
1409         /* Last possibility is the LANG environment variable.  */
1410         "LANG",
1411         /* NULL exit loops */
1412         NULL
1413     };
1414
1415     size_t i;
1416     const char *locale = NULL;
1417
1418     for (i = 0; var[i] != NULL; i++)
1419     {
1420         locale = getenv (var[i]);
1421         if (locale != NULL && locale[0] != '\0')
1422             break;
1423     }
1424
1425     if (locale == NULL)
1426         locale = "";
1427
1428     return g_strdup (locale);
1429 }
1430
1431 /* --------------------------------------------------------------------------------------------- */
1432
1433 /**
1434  * The "profile root" is the tree under which all of MC's user data &
1435  * settings are stored.
1436  *
1437  * It defaults to the user's home dir. The user may override this default
1438  * with the environment variable $MC_PROFILE_ROOT.
1439  */
1440 const char *
1441 mc_get_profile_root (void)
1442 {
1443     static const char *profile_root = NULL;
1444
1445     if (profile_root == NULL)
1446     {
1447         profile_root = g_getenv ("MC_PROFILE_ROOT");
1448         if (profile_root == NULL || *profile_root == '\0')
1449             profile_root = mc_config_get_home_dir ();
1450     }
1451
1452     return profile_root;
1453 }
1454
1455 /* --------------------------------------------------------------------------------------------- */
1456 /**
1457  * Propagate 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_propagate_error (GError ** dest, int code, const char *format, ...)
1467 {
1468     if (dest != NULL && *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_propagate_error (dest, tmp_error);
1478     }
1479 }
1480
1481 /* --------------------------------------------------------------------------------------------- */
1482 /**
1483  * Replace existing error in simple way.
1484  *
1485  * @param dest error return location
1486  * @param code error code
1487  * @param format printf()-style format for error message
1488  * @param ... parameters for message format
1489  */
1490
1491 void
1492 mc_replace_error (GError ** dest, int code, const char *format, ...)
1493 {
1494     if (dest != NULL)
1495     {
1496         GError *tmp_error;
1497         va_list args;
1498
1499         va_start (args, format);
1500         tmp_error = g_error_new_valist (MC_ERROR, code, format, args);
1501         va_end (args);
1502
1503         g_error_free (*dest);
1504         *dest = NULL;
1505         g_propagate_error (dest, tmp_error);
1506     }
1507 }
1508
1509 /* --------------------------------------------------------------------------------------------- */
1510
1511 /**
1512  * Returns if the given duration has elapsed since the given timestamp,
1513  * and if it has then updates the timestamp.
1514  *
1515  * @param timestamp the last timestamp in microseconds, updated if the given time elapsed
1516  * @param delay amount of time in microseconds
1517
1518  * @return TRUE if clock skew detected, FALSE otherwise
1519  */
1520 gboolean
1521 mc_time_elapsed (gint64 * timestamp, gint64 delay)
1522 {
1523     gint64 now;
1524
1525     now = g_get_monotonic_time ();
1526
1527     if (now >= *timestamp && now < *timestamp + delay)
1528         return FALSE;
1529
1530     *timestamp = now;
1531     return TRUE;
1532 }
1533
1534 /* --------------------------------------------------------------------------------------------- */