lib/regextype.c

   1
   2 /* regextype.c -- Decode the name of a regular expression syntax into am
   3                   option name.
   4
   5    Copyright 2005 Free Software Foundation, Inc.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2, or (at your option)
  10    any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software Foundation,
  19    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  20
  21 /* Written by James Youngman, <jay@gnu.org>. */
  22
  23 #if HAVE_CONFIG_H
  24 # include <config.h>
  25 #endif
  26
  27 #include <string.h>
  28 #include <stdio.h>
  29
  30 #include "regextype.h"
  31 #include "regex.h"
  32 #include "quote.h"
  33 #include "quotearg.h"
  34 #include "xalloc.h"
  35 #include "error.h"
  36
  37
  38 #if ENABLE_NLS
  39 # include <libintl.h>
  40 # define _(Text) gettext (Text)
  41 #else
  42 # define _(Text) Text
  43 #endif
  44 #ifdef gettext_noop
  45 # define N_(String) gettext_noop (String)
  46 #else
  47 /* See locate.c for explanation as to why not use (String) */
  48 # define N_(String) String
  49 #endif
  50
  51
  52
  53 struct tagRegexTypeMap
  54 {
  55   char *name;
  56   int   option_val;
  57 };
  58
  59 struct tagRegexTypeMap regex_map[] =
  60   {
  61 #ifdef FINDUTILS
  62    { "findutils-default",      RE_SYNTAX_EMACS|RE_DOT_NEWLINE  },
  63 #endif
  64    { "awk",                    RE_SYNTAX_AWK                   },
  65    { "egrep",                  RE_SYNTAX_EGREP                 },
  66 #ifndef FINDUTILS
  67    { "ed",                     RE_SYNTAX_ED                    },
  68 #endif
  69    { "emacs",                  RE_SYNTAX_EMACS                 },
  70    { "gnu-awk",                RE_SYNTAX_GNU_AWK               },
  71    { "grep",                   RE_SYNTAX_GREP                  },
  72    { "posix-awk",              RE_SYNTAX_POSIX_AWK             },
  73    { "posix-basic",            RE_SYNTAX_POSIX_BASIC           },
  74    { "posix-egrep",            RE_SYNTAX_POSIX_EGREP           },
  75    { "posix-extended",         RE_SYNTAX_POSIX_EXTENDED        },
  76 #ifndef FINDUTILS
  77    { "posix-minimal-basic",   RE_SYNTAX_POSIX_MINIMAL_BASIC    },
  78    { "sed",                    RE_SYNTAX_SED                   },
  79    /*    ,{ "posix-common",   _RE_SYNTAX_POSIX_COMMON   } */
  80 #endif
  81   };
  82 enum { N_REGEX_MAP_ENTRIES = sizeof(regex_map)/sizeof(regex_map[0]) };
  83
  84 int
  85 get_regex_type(const char *s)
  86 {
  87   unsigned i;
  88   size_t msglen;
  89   char *buf, *p;
  90
  91   msglen = 0u;
  92   for (i=0u; i<N_REGEX_MAP_ENTRIES; ++i)
  93     {
  94       if (0 == strcmp(regex_map[i].name, s))
  95         return regex_map[i].option_val;
  96       else
  97         msglen += strlen(quote(regex_map[i].name)) + 2u;
  98     }
  99
 100   /* We didn't find a match for the type of regular expression that the
 101    * user indicated they wanted.  Tell them what the options are.
 102    */
 103   p = buf = xmalloc(1u + msglen);
 104   for (i=0u; i<N_REGEX_MAP_ENTRIES; ++i)
 105     {
 106       if (i > 0u)
 107         {
 108           strcpy(p, ", ");
 109           p += 2;
 110         }
 111       p += sprintf(p, "%s", quote(regex_map[i].name));
 112     }
 113
 114   error(1, 0, _("Unknown regular expression type %s; valid types are %s."),
 115         quote(s),
 116         buf);
 117   /*NOTREACHED*/
 118   return -1;
 119 }
 120
 121
 122 const char *
 123 get_regex_type_name(int ix)
 124 {
 125   if (ix < N_REGEX_MAP_ENTRIES)
 126     return regex_map[ix].name;
 127   else
 128     return NULL;
 129 }
 130
 131 int
 132 get_regex_type_flags(int ix)
 133 {
 134   if (ix < N_REGEX_MAP_ENTRIES)
 135     return regex_map[ix].option_val;
 136   else
 137     return -1;
 138 }
 139
 140
 141 int get_regex_type_synonym(int ix)
 142 {
 143   unsigned i;
 144   if (ix >= N_REGEX_MAP_ENTRIES)
 145     return -1;
 146
 147   int flags = regex_map[ix].option_val;
 148   for (i=0u; i<ix; ++i)
 149     {
 150       if (flags == regex_map[i].option_val)
 151         {
 152           return i;
 153         }
 154     }
 155   return -1;
 156 }