1 /* argmatch.c -- find a match for a string in an array
3 Copyright (C) 1990, 1998, 1999, 2001, 2002, 2003 Free Software
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software Foundation,
18 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20 /* Written by David MacKenzie <djm@ai.mit.edu>
21 Modified by Akim Demaille <demaille@inf.enst.fr> */
35 #define _(msgid) gettext (msgid)
41 #include "unlocked-io.h"
43 /* When reporting an invalid argument, show nonprinting characters
44 by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
45 literal_quoting_style. */
46 #ifndef ARGMATCH_QUOTING_STYLE
47 # define ARGMATCH_QUOTING_STYLE locale_quoting_style
50 /* Non failing version of argmatch call this function after failing. */
52 # define ARGMATCH_DIE exit (EXIT_FAILURE)
55 #ifdef ARGMATCH_DIE_DECL
65 /* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
66 Default to __argmatch_die, but allow caller to change this at run-time. */
67 argmatch_exit_fn argmatch_die = __argmatch_die;
70 /* If ARG is an unambiguous match for an element of the
71 null-terminated array ARGLIST, return the index in ARGLIST
72 of the matched element, else -1 if it does not match any element
73 or -2 if it is ambiguous (is a prefix of more than one element).
75 If VALLIST is none null, use it to resolve ambiguities limited to
79 "y" is a valid argument, for `0', and "n" for `1'. */
82 argmatch (const char *arg, const char *const *arglist,
83 const char *vallist, size_t valsize)
85 int i; /* Temporary index in ARGLIST. */
86 size_t arglen; /* Length of ARG. */
87 int matchind = -1; /* Index of first nonexact match. */
88 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
90 arglen = strlen (arg);
92 /* Test all elements for either exact match or abbreviated matches. */
93 for (i = 0; arglist[i]; i++)
95 if (!strncmp (arglist[i], arg, arglen))
97 if (strlen (arglist[i]) == arglen)
98 /* Exact match found. */
100 else if (matchind == -1)
101 /* First nonexact match found. */
105 /* Second nonexact match found. */
107 || memcmp (vallist + valsize * matchind,
108 vallist + valsize * i, valsize))
110 /* There is a real ambiguity, or we could not
123 /* Error reporting for argmatch.
124 CONTEXT is a description of the type of entity that was being matched.
125 VALUE is the invalid value that was given.
126 PROBLEM is the return value from argmatch. */
129 argmatch_invalid (const char *context, const char *value, int problem)
131 char const *format = (problem == -1
132 ? _("invalid argument %s for %s")
133 : _("ambiguous argument %s for %s"));
135 error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
136 quote_n (1, context));
139 /* List the valid arguments for argmatch.
140 ARGLIST is the same as in argmatch.
141 VALLIST is a pointer to an array of values.
142 VALSIZE is the size of the elements of VALLIST */
144 argmatch_valid (const char *const *arglist,
145 const char *vallist, size_t valsize)
148 const char *last_val = NULL;
150 /* We try to put synonyms on the same line. The assumption is that
151 synonyms follow each other */
152 fprintf (stderr, _("Valid arguments are:"));
153 for (i = 0; arglist[i]; i++)
155 || memcmp (last_val, vallist + valsize * i, valsize))
157 fprintf (stderr, "\n - `%s'", arglist[i]);
158 last_val = vallist + valsize * i;
162 fprintf (stderr, ", `%s'", arglist[i]);
167 /* Never failing versions of the previous functions.
169 CONTEXT is the context for which argmatch is called (e.g.,
170 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
171 calls the (supposed never to return) function EXIT_FN. */
174 __xargmatch_internal (const char *context,
175 const char *arg, const char *const *arglist,
176 const char *vallist, size_t valsize,
177 argmatch_exit_fn exit_fn)
179 int res = argmatch (arg, arglist, vallist, valsize);
184 /* We failed. Explain why. */
185 argmatch_invalid (context, arg, res);
186 argmatch_valid (arglist, vallist, valsize);
189 return -1; /* To please the compilers. */
192 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
193 return the first corresponding argument in ARGLIST */
195 argmatch_to_argument (const char *value,
196 const char *const *arglist,
197 const char *vallist, size_t valsize)
201 for (i = 0; arglist[i]; i++)
202 if (!memcmp (value, vallist + valsize * i, valsize))
209 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
213 /* When to make backup files. */
216 /* Never make backups. */
219 /* Make simple backups of every file. */
222 /* Make numbered backups of files that already have numbered backups,
223 and simple backups of the others. */
226 /* Make numbered backups of every file. */
230 /* Two tables describing arguments (keys) and their corresponding
232 static const char *const backup_args[] =
241 static const enum backup_type backup_vals[] =
245 numbered_existing, numbered_existing,
250 main (int argc, const char *const *argv)
253 enum backup_type backup_type = none;
255 program_name = (char *) argv[0];
259 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
263 if ((cp = getenv ("VERSION_CONTROL")))
264 backup_type = XARGMATCH ("$VERSION_CONTROL", cp,
265 backup_args, backup_vals);
268 backup_type = XARGMATCH (program_name, argv[1],
269 backup_args, backup_vals);
271 printf ("The version control is `%s'\n",
272 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));