lib/glob/glob_loop.c

   1 /* Copyright (C) 1991-2005 Free Software Foundation, Inc.
   2
   3    This file is part of GNU Bash, the Bourne Again SHell.
   4
   5    Bash is free software; you can redistribute it and/or modify it under
   6    the terms of the GNU General Public License as published by the Free
   7    Software Foundation; either version 2, or (at your option) any later
   8    version.
   9
  10    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  11    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13    for more details.
  14
  15    You should have received a copy of the GNU General Public License along
  16    with Bash; see the file COPYING.  If not, write to the Free Software
  17    Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
  18
  19 static int INTERNAL_GLOB_PATTERN_P __P((const CHAR *));
  20
  21 /* Return nonzero if PATTERN has any special globbing chars in it.
  22    Compiled twice, once each for single-byte and multibyte characters. */
  23 static int
  24 INTERNAL_GLOB_PATTERN_P (pattern)
  25      const CHAR *pattern;
  26 {
  27   register const CHAR *p;
  28   register CHAR c;
  29   int bopen;
  30
  31   p = pattern;
  32   bopen = 0;
  33
  34   while ((c = *p++) != L('\0'))
  35     switch (c)
  36       {
  37       case L('?'):
  38       case L('*'):
  39         return 1;
  40
  41       case L('['):      /* Only accept an open brace if there is a close */
  42         bopen++;        /* brace to match it.  Bracket expressions must be */
  43         continue;       /* complete, according to Posix.2 */
  44       case L(']'):
  45         if (bopen)
  46           return 1;
  47         continue;
  48
  49       case L('+'):         /* extended matching operators */
  50       case L('@'):
  51       case L('!'):
  52         if (*p == L('('))  /*) */
  53           return 1;
  54         continue;
  55
  56       case L('\\'):
  57         if (*p++ == L('\0'))
  58           return 0;
  59       }
  60
  61   return 0;
  62 }
  63
  64 #undef INTERNAL_GLOB_PATTERN_P
  65 #undef L
  66 #undef INT
  67 #undef CHAR