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 "xalloc.h"
  34 #include "error.h"
  35
  36
  37 #if ENABLE_NLS
  38 # include <libintl.h>
  39 # define _(Text) gettext (Text)
  40 #else
  41 # define _(Text) Text
  42 #endif
  43 #ifdef gettext_noop
  44 # define N_(String) gettext_noop (String)
  45 #else
  46 /* See locate.c for explanation as to why not use (String) */
  47 # define N_(String) String
  48 #endif
  49
  50
  51
  52 struct tagRegexTypeMap
  53 {
  54   char *name;
  55   int   option_val;
  56 };
  57
  58 struct tagRegexTypeMap regex_map[] =
  59   {
  60 #ifdef FINDUTILS
  61    { "findutils-default",      RE_SYNTAX_EMACS|RE_DOT_NEWLINE  },
  62 #endif
  63    { "awk",                    RE_SYNTAX_AWK                   },
  64    { "egrep",                  RE_SYNTAX_EGREP                 },
  65 #ifndef FINDUTILS
  66    { "ed",                     RE_SYNTAX_ED                    },
  67 #endif
  68    { "emacs",                  RE_SYNTAX_EMACS                 },
  69    { "gnu-awk",                RE_SYNTAX_GNU_AWK               },
  70    { "grep",                   RE_SYNTAX_GREP                  },
  71    { "posix-awk",              RE_SYNTAX_POSIX_AWK             },
  72    { "posix-basic",            RE_SYNTAX_POSIX_BASIC           },
  73    { "posix-egrep",            RE_SYNTAX_POSIX_EGREP           },
  74    { "posix-extended",         RE_SYNTAX_POSIX_EXTENDED        },
  75 #ifndef FINDUTILS
  76    { "posix-minimal-basic",   RE_SYNTAX_POSIX_MINIMAL_BASIC    },
  77    { "sed",                    RE_SYNTAX_SED                   },
  78    /*    ,{ "posix-common",   _RE_SYNTAX_POSIX_COMMON   } */
  79 #endif
  80   };
  81 enum { N_REGEX_MAP_ENTRIES = sizeof(regex_map)/sizeof(regex_map[0]) };
  82
  83 int
  84 get_regex_type(const char *s)
  85 {
  86   unsigned i;
  87   size_t msglen;
  88   char *buf, *p;
  89
  90   msglen = 0u;
  91   for (i=0u; i<N_REGEX_MAP_ENTRIES; ++i)
  92     {
  93       if (0 == strcmp(regex_map[i].name, s))
  94         return regex_map[i].option_val;
  95       else
  96         msglen += strlen(quote(regex_map[i].name)) + 2u;
  97     }
  98
  99   /* We didn't find a match for the type of regular expression that the
 100    * user indicated they wanted.  Tell them what the options are.
 101    */
 102   p = buf = xmalloc(1u + msglen);
 103   for (i=0u; i<N_REGEX_MAP_ENTRIES; ++i)
 104     {
 105       if (i > 0u)
 106         {
 107           strcpy(p, ", ");
 108           p += 2;
 109         }
 110       p += sprintf(p, "%s", quote(regex_map[i].name));
 111     }
 112
 113   error(1, 0, _("Unknown regular expression type %s; valid types are %s."),
 114         quote(s),
 115         buf);
 116   /*NOTREACHED*/
 117   return -1;
 118 }
 119
 120
 121 const char *
 122 get_regex_type_name(unsigned int ix)
 123 {
 124   if (ix < N_REGEX_MAP_ENTRIES)
 125     return regex_map[ix].name;
 126   else
 127     return NULL;
 128 }
 129
 130 int
 131 get_regex_type_flags(unsigned int ix)
 132 {
 133   if (ix < N_REGEX_MAP_ENTRIES)
 134     return regex_map[ix].option_val;
 135   else
 136     return -1;
 137 }
 138
 139
 140 int get_regex_type_synonym(unsigned int ix)
 141 {
 142   unsigned i;
 143   int flags;
 144
 145   if (ix >= N_REGEX_MAP_ENTRIES)
 146     return -1;
 147
 148   flags = regex_map[ix].option_val;
 149   for (i=0u; i<ix; ++i)
 150     {
 151       if (flags == regex_map[i].option_val)
 152         {
 153           return i;
 154         }
 155     }
 156   return -1;
 157 }