lib/readline/parse-colors.c

   1 /* `dir', `vdir' and `ls' directory listing programs for GNU.
   2
   3    Modified by Chet Ramey for Readline.
   4
   5    Copyright (C) 1985, 1988, 1990-1991, 1995-2010, 2012, 2017
   6    Free Software Foundation, Inc.
   7
   8    This program is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 /* Written by Richard Stallman and David MacKenzie.  */
  22
  23 /* Color support by Peter Anvin <Peter.Anvin@linux.org> and Dennis
  24    Flaherty <dennisf@denix.elk.miles.com> based on original patches by
  25    Greg Lee <lee@uhunix.uhcc.hawaii.edu>.  */
  26
  27 #define READLINE_LIBRARY
  28
  29 #if defined (HAVE_CONFIG_H)
  30 #  include <config.h>
  31 #endif
  32
  33 #include <stdio.h>
  34
  35 // strdup() / strcpy()
  36 #if defined (HAVE_STRING_H)
  37 #  include <string.h>
  38 #else /* !HAVE_STRING_H */
  39 #  include <strings.h>
  40 #endif /* !HAVE_STRING_H */
  41
  42 // abort()
  43 #if defined (HAVE_STDLIB_H)
  44 #  include <stdlib.h>
  45 #else
  46 #  include "ansi_stdlib.h"
  47 #endif /* HAVE_STDLIB_H */
  48
  49 #include "rldefs.h"     // STREQ, savestring
  50 #include "readline.h"
  51 #include "rlprivate.h"
  52 #include "rlshell.h"
  53 #include "xmalloc.h"
  54
  55 #include "colors.h"
  56 #include "parse-colors.h"
  57
  58 #if defined (COLOR_SUPPORT)
  59
  60 static bool get_funky_string (char **dest, const char **src, bool equals_end, size_t *output_count);
  61
  62 struct bin_str _rl_color_indicator[] =
  63   {
  64     { LEN_STR_PAIR ("\033[") },         //  lc: Left of color sequence
  65     { LEN_STR_PAIR ("m") },             //  rc: Right of color sequence
  66     { 0, NULL },                        //  ec: End color (replaces lc+no+rc)
  67     { LEN_STR_PAIR ("0") },             //  rs: Reset to ordinary colors
  68     { 0, NULL },                        //  no: Normal
  69     { 0, NULL },                        //  fi: File: default
  70     { LEN_STR_PAIR ("01;34") },         //  di: Directory: bright blue
  71     { LEN_STR_PAIR ("01;36") },         //  ln: Symlink: bright cyan
  72     { LEN_STR_PAIR ("33") },            //  pi: Pipe: yellow/brown
  73     { LEN_STR_PAIR ("01;35") },         //  so: Socket: bright magenta
  74     { LEN_STR_PAIR ("01;33") },         //  bd: Block device: bright yellow
  75     { LEN_STR_PAIR ("01;33") },         //  cd: Char device: bright yellow
  76     { 0, NULL },                        //  mi: Missing file: undefined
  77     { 0, NULL },                        //  or: Orphaned symlink: undefined
  78     { LEN_STR_PAIR ("01;32") },         //  ex: Executable: bright green
  79     { LEN_STR_PAIR ("01;35") },         //  do: Door: bright magenta
  80     { LEN_STR_PAIR ("37;41") },         //  su: setuid: white on red
  81     { LEN_STR_PAIR ("30;43") },         //  sg: setgid: black on yellow
  82     { LEN_STR_PAIR ("37;44") },         //  st: sticky: black on blue
  83     { LEN_STR_PAIR ("34;42") },         //  ow: other-writable: blue on green
  84     { LEN_STR_PAIR ("30;42") },         //  tw: ow w/ sticky: black on green
  85     { LEN_STR_PAIR ("30;41") },         //  ca: black on red
  86     { 0, NULL },                        //  mh: disabled by default
  87     { LEN_STR_PAIR ("\033[K") },        //  cl: clear to end of line
  88   };
  89
  90 /* Parse a string as part of the LS_COLORS variable; this may involve
  91    decoding all kinds of escape characters.  If equals_end is set an
  92    unescaped equal sign ends the string, otherwise only a : or \0
  93    does.  Set *OUTPUT_COUNT to the number of bytes output.  Return
  94    true if successful.
  95
  96    The resulting string is *not* null-terminated, but may contain
  97    embedded nulls.
  98
  99    Note that both dest and src are char **; on return they point to
 100    the first free byte after the array and the character that ended
 101    the input string, respectively.  */
 102
 103 static bool
 104 get_funky_string (char **dest, const char **src, bool equals_end, size_t *output_count) {
 105   char num;                     /* For numerical codes */
 106   size_t count;                 /* Something to count with */
 107   enum {
 108     ST_GND, ST_BACKSLASH, ST_OCTAL, ST_HEX, ST_CARET, ST_END, ST_ERROR
 109   } state;
 110   const char *p;
 111   char *q;
 112
 113   p = *src;                     /* We don't want to double-indirect */
 114   q = *dest;                    /* the whole darn time.  */
 115
 116   count = 0;                    /* No characters counted in yet.  */
 117   num = 0;
 118
 119   state = ST_GND;               /* Start in ground state.  */
 120   while (state < ST_END)
 121     {
 122       switch (state)
 123         {
 124         case ST_GND:            /* Ground state (no escapes) */
 125           switch (*p)
 126             {
 127             case ':':
 128             case '\0':
 129               state = ST_END;   /* End of string */
 130               break;
 131             case '\\':
 132               state = ST_BACKSLASH; /* Backslash scape sequence */
 133               ++p;
 134               break;
 135             case '^':
 136               state = ST_CARET; /* Caret escape */
 137               ++p;
 138               break;
 139             case '=':
 140               if (equals_end)
 141                 {
 142                   state = ST_END; /* End */
 143                   break;
 144                 }
 145               /* else fall through */
 146             default:
 147               *(q++) = *(p++);
 148               ++count;
 149               break;
 150             }
 151           break;
 152
 153         case ST_BACKSLASH:      /* Backslash escaped character */
 154           switch (*p)
 155             {
 156             case '0':
 157             case '1':
 158             case '2':
 159             case '3':
 160             case '4':
 161             case '5':
 162             case '6':
 163             case '7':
 164               state = ST_OCTAL; /* Octal sequence */
 165               num = *p - '0';
 166               break;
 167             case 'x':
 168             case 'X':
 169               state = ST_HEX;   /* Hex sequence */
 170               num = 0;
 171               break;
 172             case 'a':           /* Bell */
 173               num = '\a';
 174               break;
 175             case 'b':           /* Backspace */
 176               num = '\b';
 177               break;
 178             case 'e':           /* Escape */
 179               num = 27;
 180               break;
 181             case 'f':           /* Form feed */
 182               num = '\f';
 183               break;
 184             case 'n':           /* Newline */
 185               num = '\n';
 186               break;
 187             case 'r':           /* Carriage return */
 188               num = '\r';
 189               break;
 190             case 't':           /* Tab */
 191               num = '\t';
 192               break;
 193             case 'v':           /* Vtab */
 194               num = '\v';
 195               break;
 196             case '?':           /* Delete */
 197               num = 127;
 198               break;
 199             case '_':           /* Space */
 200               num = ' ';
 201               break;
 202             case '\0':          /* End of string */
 203               state = ST_ERROR; /* Error! */
 204               break;
 205             default:            /* Escaped character like \ ^ : = */
 206               num = *p;
 207               break;
 208             }
 209           if (state == ST_BACKSLASH)
 210             {
 211               *(q++) = num;
 212               ++count;
 213               state = ST_GND;
 214             }
 215           ++p;
 216           break;
 217
 218         case ST_OCTAL:          /* Octal sequence */
 219           if (*p < '0' || *p > '7')
 220             {
 221               *(q++) = num;
 222               ++count;
 223               state = ST_GND;
 224             }
 225           else
 226             num = (num << 3) + (*(p++) - '0');
 227           break;
 228
 229         case ST_HEX:            /* Hex sequence */
 230           switch (*p)
 231             {
 232             case '0':
 233             case '1':
 234             case '2':
 235             case '3':
 236             case '4':
 237             case '5':
 238             case '6':
 239             case '7':
 240             case '8':
 241             case '9':
 242               num = (num << 4) + (*(p++) - '0');
 243               break;
 244             case 'a':
 245             case 'b':
 246             case 'c':
 247             case 'd':
 248             case 'e':
 249             case 'f':
 250               num = (num << 4) + (*(p++) - 'a') + 10;
 251               break;
 252             case 'A':
 253             case 'B':
 254             case 'C':
 255             case 'D':
 256             case 'E':
 257             case 'F':
 258               num = (num << 4) + (*(p++) - 'A') + 10;
 259               break;
 260             default:
 261               *(q++) = num;
 262               ++count;
 263               state = ST_GND;
 264               break;
 265             }
 266           break;
 267
 268         case ST_CARET:          /* Caret escape */
 269           state = ST_GND;       /* Should be the next state... */
 270           if (*p >= '@' && *p <= '~')
 271             {
 272               *(q++) = *(p++) & 037;
 273               ++count;
 274             }
 275           else if (*p == '?')
 276             {
 277               *(q++) = 127;
 278               ++count;
 279             }
 280           else
 281             state = ST_ERROR;
 282           break;
 283
 284         default:
 285           /* should we ? */
 286           /* abort ();  no, we should not */
 287           state = ST_ERROR;
 288           break;
 289         }
 290     }
 291
 292   *dest = q;
 293   *src = p;
 294   *output_count = count;
 295
 296   return state != ST_ERROR;
 297 }
 298 #endif /* COLOR_SUPPORT */
 299
 300 void _rl_parse_colors(void)
 301 {
 302 #if defined (COLOR_SUPPORT)
 303   const char *p;                /* Pointer to character being parsed */
 304   char *buf;                    /* color_buf buffer pointer */
 305   int state;                    /* State of parser */
 306   int ind_no;                   /* Indicator number */
 307   char label[3];                /* Indicator label */
 308   COLOR_EXT_TYPE *ext;          /* Extension we are working on */
 309
 310   p = sh_get_env_value ("LS_COLORS");
 311   if (p == 0 || *p == '\0')
 312     {
 313       _rl_color_ext_list = NULL;
 314       return;
 315     }
 316
 317   ext = NULL;
 318   strcpy (label, "??");
 319
 320   /* This is an overly conservative estimate, but any possible
 321      LS_COLORS string will *not* generate a color_buf longer than
 322      itself, so it is a safe way of allocating a buffer in
 323      advance.  */
 324   buf = color_buf = savestring (p);
 325
 326   state = 1;
 327   while (state > 0)
 328     {
 329       switch (state)
 330         {
 331         case 1:         /* First label character */
 332           switch (*p)
 333             {
 334             case ':':
 335               ++p;
 336               break;
 337
 338             case '*':
 339               /* Allocate new extension block and add to head of
 340                  linked list (this way a later definition will
 341                  override an earlier one, which can be useful for
 342                  having terminal-specific defs override global).  */
 343
 344               ext = (COLOR_EXT_TYPE *)xmalloc (sizeof *ext);
 345               ext->next = _rl_color_ext_list;
 346               _rl_color_ext_list = ext;
 347
 348               ++p;
 349               ext->ext.string = buf;
 350
 351               state = (get_funky_string (&buf, &p, true, &ext->ext.len)
 352                        ? 4 : -1);
 353               break;
 354
 355             case '\0':
 356               state = 0;        /* Done! */
 357               break;
 358
 359             default:    /* Assume it is file type label */
 360               label[0] = *(p++);
 361               state = 2;
 362               break;
 363             }
 364           break;
 365
 366         case 2:         /* Second label character */
 367           if (*p)
 368             {
 369               label[1] = *(p++);
 370               state = 3;
 371             }
 372           else
 373             state = -1; /* Error */
 374           break;
 375
 376         case 3:         /* Equal sign after indicator label */
 377           state = -1;   /* Assume failure...  */
 378           if (*(p++) == '=')/* It *should* be...  */
 379             {
 380               for (ind_no = 0; indicator_name[ind_no] != NULL; ++ind_no)
 381                 {
 382                   if (STREQ (label, indicator_name[ind_no]))
 383                     {
 384                       _rl_color_indicator[ind_no].string = buf;
 385                       state = (get_funky_string (&buf, &p, false,
 386                                                  &_rl_color_indicator[ind_no].len)
 387                                ? 1 : -1);
 388                       break;
 389                     }
 390                 }
 391               if (state == -1)
 392                 {
 393                   _rl_errmsg ("LS_COLORS: unrecognized prefix: %s", label);
 394                   /* recover from an unrecognized prefix */
 395                   while (p && *p && *p != ':')
 396                     p++;
 397                   if (p && *p == ':')
 398                     state = 1;
 399                   else if (p && *p == 0)
 400                     state = 0;
 401                 }
 402             }
 403           break;
 404
 405         case 4:         /* Equal sign after *.ext */
 406           if (*(p++) == '=')
 407             {
 408               ext->seq.string = buf;
 409               state = (get_funky_string (&buf, &p, false, &ext->seq.len)
 410                        ? 1 : -1);
 411             }
 412           else
 413             state = -1;
 414           /* XXX - recover here as with an unrecognized prefix? */
 415           if (state == -1 && ext->ext.string)
 416             _rl_errmsg ("LS_COLORS: syntax error: %s", ext->ext.string);
 417           break;
 418         }
 419     }
 420
 421   if (state < 0)
 422     {
 423       COLOR_EXT_TYPE *e;
 424       COLOR_EXT_TYPE *e2;
 425
 426       _rl_errmsg ("unparsable value for LS_COLORS environment variable");
 427       free (color_buf);
 428       for (e = _rl_color_ext_list; e != NULL; /* empty */)
 429         {
 430           e2 = e;
 431           e = e->next;
 432           free (e2);
 433         }
 434       _rl_color_ext_list = NULL;
 435       _rl_colored_stats = 0;    /* can't have colored stats without colors */
 436     }
 437 #else /* !COLOR_SUPPORT */
 438   ;
 439 #endif /* !COLOR_SUPPORT */
 440 }