lib/exclude.c

   1 /* exclude.c -- exclude file names
   2    Copyright 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; see the file COPYING.
  16    If not, write to the Free Software Foundation,
  17    59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  18
  19 /* Written by Paul Eggert <eggert@twinsun.com>  */
  20
  21 #if HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #include <errno.h>
  26 #ifndef errno
  27 extern int errno;
  28 #endif
  29 #include <exclude.h>
  30 #include <fnmatch.h>
  31 #include <stdio.h>
  32 #include <sys/types.h>
  33
  34 void *xmalloc PARAMS ((size_t));
  35 void *xrealloc PARAMS ((void *, size_t));
  36
  37 /* Keep track of excluded file name patterns.  */
  38
  39 struct exclude
  40   {
  41     char const **exclude;
  42     int exclude_alloc;
  43     int exclude_count;
  44   };
  45
  46 struct exclude *
  47 new_exclude (void)
  48 {
  49   struct exclude *ex = (struct exclude *) xmalloc (sizeof (struct exclude));
  50   ex->exclude_count = 0;
  51   ex->exclude_alloc = 64;
  52   ex->exclude = (char const **) xmalloc (ex->exclude_alloc * sizeof (char *));
  53   return ex;
  54 }
  55
  56 int
  57 excluded_filename (struct exclude const *ex, char const *f)
  58 {
  59   char const * const *exclude = ex->exclude;
  60   int exclude_count = ex->exclude_count;
  61   int i;
  62
  63   for (i = 0;  i < exclude_count;  i++)
  64     if (fnmatch (exclude[i], f, 0) == 0)
  65       return 1;
  66
  67   return 0;
  68 }
  69
  70 void
  71 add_exclude (struct exclude *ex, char const *pattern)
  72 {
  73   if (ex->exclude_alloc <= ex->exclude_count)
  74     ex->exclude = (char const **) xrealloc (ex->exclude,
  75                                             ((ex->exclude_alloc *= 2)
  76                                              * sizeof (char *)));
  77
  78   ex->exclude[ex->exclude_count++] = pattern;
  79 }
  80
  81 int
  82 add_exclude_file (struct exclude *ex, char const *filename, char line_end)
  83 {
  84   int use_stdin = filename[0] == '-' && !filename[1];
  85   FILE *in;
  86   char *buf;
  87   char *p;
  88   char const *pattern;
  89   char const *lim;
  90   size_t buf_alloc = 1024;
  91   size_t buf_count = 0;
  92   int c;
  93   int e = 0;
  94
  95   if (use_stdin)
  96     in = stdin;
  97   else if (! (in = fopen (filename, "r")))
  98     return -1;
  99
 100   buf = xmalloc (buf_alloc);
 101
 102   while ((c = getc (in)) != EOF)
 103     {
 104       buf[buf_count++] = c;
 105       if (buf_count == buf_alloc)
 106         buf = xrealloc (buf, buf_alloc *= 2);
 107     }
 108
 109   buf = xrealloc (buf, buf_count + 1);
 110
 111   if (ferror (in))
 112     e = errno;
 113
 114   if (!use_stdin && fclose (in) != 0)
 115     e = errno;
 116
 117   for (pattern = p = buf, lim = buf + buf_count;  p <= lim;  p++)
 118     if (p < lim ? *p == line_end : buf < p && p[-1])
 119       {
 120         *p = '\0';
 121         add_exclude (ex, pattern);
 122         pattern = p + 1;
 123       }
 124
 125   errno = e;
 126   return e ? -1 : 0;
 127 }