1 /* argmatch.c -- find a match for a string in an array
3 Copyright (C) 1990, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006, 2007
4 Free Software Foundation, Inc.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
20 /* Written by David MacKenzie <djm@ai.mit.edu>
21 Modified by Akim Demaille <demaille@inf.enst.fr> */
34 #define _(msgid) gettext (msgid)
41 # include "unlocked-io.h"
44 /* When reporting an invalid argument, show nonprinting characters
45 by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
46 literal_quoting_style. */
47 #ifndef ARGMATCH_QUOTING_STYLE
48 # define ARGMATCH_QUOTING_STYLE locale_quoting_style
51 /* Non failing version of argmatch call this function after failing. */
53 # include "exitfail.h"
54 # define ARGMATCH_DIE exit (exit_failure)
57 #ifdef ARGMATCH_DIE_DECL
67 /* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
68 Default to __argmatch_die, but allow caller to change this at run-time. */
69 argmatch_exit_fn argmatch_die = __argmatch_die;
72 /* If ARG is an unambiguous match for an element of the
73 NULL-terminated array ARGLIST, return the index in ARGLIST
74 of the matched element, else -1 if it does not match any element
75 or -2 if it is ambiguous (is a prefix of more than one element).
77 If VALLIST is none null, use it to resolve ambiguities limited to
81 "y" is a valid argument, for `0', and "n" for `1'. */
84 argmatch (const char *arg, const char *const *arglist,
85 const char *vallist, size_t valsize)
87 size_t i; /* Temporary index in ARGLIST. */
88 size_t arglen; /* Length of ARG. */
89 ptrdiff_t matchind = -1; /* Index of first nonexact match. */
90 bool ambiguous = false; /* If true, multiple nonexact match(es). */
92 arglen = strlen (arg);
94 /* Test all elements for either exact match or abbreviated matches. */
95 for (i = 0; arglist[i]; i++)
97 if (!strncmp (arglist[i], arg, arglen))
99 if (strlen (arglist[i]) == arglen)
100 /* Exact match found. */
102 else if (matchind == -1)
103 /* First nonexact match found. */
107 /* Second nonexact match found. */
109 || memcmp (vallist + valsize * matchind,
110 vallist + valsize * i, valsize))
112 /* There is a real ambiguity, or we could not
125 /* Error reporting for argmatch.
126 CONTEXT is a description of the type of entity that was being matched.
127 VALUE is the invalid value that was given.
128 PROBLEM is the return value from argmatch. */
131 argmatch_invalid (const char *context, const char *value, ptrdiff_t problem)
133 char const *format = (problem == -1
134 ? _("invalid argument %s for %s")
135 : _("ambiguous argument %s for %s"));
137 error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
138 quote_n (1, context));
141 /* List the valid arguments for argmatch.
142 ARGLIST is the same as in argmatch.
143 VALLIST is a pointer to an array of values.
144 VALSIZE is the size of the elements of VALLIST */
146 argmatch_valid (const char *const *arglist,
147 const char *vallist, size_t valsize)
150 const char *last_val = NULL;
152 /* We try to put synonyms on the same line. The assumption is that
153 synonyms follow each other */
154 fprintf (stderr, _("Valid arguments are:"));
155 for (i = 0; arglist[i]; i++)
157 || memcmp (last_val, vallist + valsize * i, valsize))
159 fprintf (stderr, "\n - `%s'", arglist[i]);
160 last_val = vallist + valsize * i;
164 fprintf (stderr, ", `%s'", arglist[i]);
169 /* Never failing versions of the previous functions.
171 CONTEXT is the context for which argmatch is called (e.g.,
172 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
173 calls the (supposed never to return) function EXIT_FN. */
176 __xargmatch_internal (const char *context,
177 const char *arg, const char *const *arglist,
178 const char *vallist, size_t valsize,
179 argmatch_exit_fn exit_fn)
181 ptrdiff_t res = argmatch (arg, arglist, vallist, valsize);
186 /* We failed. Explain why. */
187 argmatch_invalid (context, arg, res);
188 argmatch_valid (arglist, vallist, valsize);
191 return -1; /* To please the compilers. */
194 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
195 return the first corresponding argument in ARGLIST */
197 argmatch_to_argument (const char *value,
198 const char *const *arglist,
199 const char *vallist, size_t valsize)
203 for (i = 0; arglist[i]; i++)
204 if (!memcmp (value, vallist + valsize * i, valsize))
211 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
215 /* When to make backup files. */
218 /* Never make backups. */
221 /* Make simple backups of every file. */
224 /* Make numbered backups of files that already have numbered backups,
225 and simple backups of the others. */
226 numbered_existing_backups,
228 /* Make numbered backups of every file. */
232 /* Two tables describing arguments (keys) and their corresponding
234 static const char *const backup_args[] =
243 static const enum backup_type backup_vals[] =
245 no_backups, no_backups, no_backups,
246 simple_backups, simple_backups,
247 numbered_existing_backups, numbered_existing_backups,
248 numbered_backups, numbered_backups
252 main (int argc, const char *const *argv)
255 enum backup_type backup_type = no_backups;
257 program_name = (char *) argv[0];
261 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
265 if ((cp = getenv ("VERSION_CONTROL")))
266 backup_type = XARGMATCH ("$VERSION_CONTROL", cp,
267 backup_args, backup_vals);
270 backup_type = XARGMATCH (program_name, argv[1],
271 backup_args, backup_vals);
273 printf ("The version control is `%s'\n",
274 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));