1 /* argmatch.c -- find a match for a string in an array
3 Copyright (C) 1990, 1998, 1999, 2001, 2002, 2003, 2004, 2005 Free
4 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> */
36 #define _(msgid) gettext (msgid)
44 # include "unlocked-io.h"
47 /* When reporting an invalid argument, show nonprinting characters
48 by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
49 literal_quoting_style. */
50 #ifndef ARGMATCH_QUOTING_STYLE
51 # define ARGMATCH_QUOTING_STYLE locale_quoting_style
54 /* Non failing version of argmatch call this function after failing. */
56 # include "exitfail.h"
57 # define ARGMATCH_DIE exit (exit_failure)
60 #ifdef ARGMATCH_DIE_DECL
70 /* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
71 Default to __argmatch_die, but allow caller to change this at run-time. */
72 argmatch_exit_fn argmatch_die = __argmatch_die;
75 /* If ARG is an unambiguous match for an element of the
76 NULL-terminated array ARGLIST, return the index in ARGLIST
77 of the matched element, else -1 if it does not match any element
78 or -2 if it is ambiguous (is a prefix of more than one element).
80 If VALLIST is none null, use it to resolve ambiguities limited to
84 "y" is a valid argument, for `0', and "n" for `1'. */
87 argmatch (const char *arg, const char *const *arglist,
88 const char *vallist, size_t valsize)
90 size_t i; /* Temporary index in ARGLIST. */
91 size_t arglen; /* Length of ARG. */
92 ptrdiff_t matchind = -1; /* Index of first nonexact match. */
93 bool ambiguous = false; /* If true, multiple nonexact match(es). */
95 arglen = strlen (arg);
97 /* Test all elements for either exact match or abbreviated matches. */
98 for (i = 0; arglist[i]; i++)
100 if (!strncmp (arglist[i], arg, arglen))
102 if (strlen (arglist[i]) == arglen)
103 /* Exact match found. */
105 else if (matchind == -1)
106 /* First nonexact match found. */
110 /* Second nonexact match found. */
112 || memcmp (vallist + valsize * matchind,
113 vallist + valsize * i, valsize))
115 /* There is a real ambiguity, or we could not
128 /* Error reporting for argmatch.
129 CONTEXT is a description of the type of entity that was being matched.
130 VALUE is the invalid value that was given.
131 PROBLEM is the return value from argmatch. */
134 argmatch_invalid (const char *context, const char *value, ptrdiff_t problem)
136 char const *format = (problem == -1
137 ? _("invalid argument %s for %s")
138 : _("ambiguous argument %s for %s"));
140 error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
141 quote_n (1, context));
144 /* List the valid arguments for argmatch.
145 ARGLIST is the same as in argmatch.
146 VALLIST is a pointer to an array of values.
147 VALSIZE is the size of the elements of VALLIST */
149 argmatch_valid (const char *const *arglist,
150 const char *vallist, size_t valsize)
153 const char *last_val = NULL;
155 /* We try to put synonyms on the same line. The assumption is that
156 synonyms follow each other */
157 fprintf (stderr, _("Valid arguments are:"));
158 for (i = 0; arglist[i]; i++)
160 || memcmp (last_val, vallist + valsize * i, valsize))
162 fprintf (stderr, "\n - `%s'", arglist[i]);
163 last_val = vallist + valsize * i;
167 fprintf (stderr, ", `%s'", arglist[i]);
172 /* Never failing versions of the previous functions.
174 CONTEXT is the context for which argmatch is called (e.g.,
175 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
176 calls the (supposed never to return) function EXIT_FN. */
179 __xargmatch_internal (const char *context,
180 const char *arg, const char *const *arglist,
181 const char *vallist, size_t valsize,
182 argmatch_exit_fn exit_fn)
184 ptrdiff_t res = argmatch (arg, arglist, vallist, valsize);
189 /* We failed. Explain why. */
190 argmatch_invalid (context, arg, res);
191 argmatch_valid (arglist, vallist, valsize);
194 return -1; /* To please the compilers. */
197 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
198 return the first corresponding argument in ARGLIST */
200 argmatch_to_argument (const char *value,
201 const char *const *arglist,
202 const char *vallist, size_t valsize)
206 for (i = 0; arglist[i]; i++)
207 if (!memcmp (value, vallist + valsize * i, valsize))
214 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
218 /* When to make backup files. */
221 /* Never make backups. */
224 /* Make simple backups of every file. */
227 /* Make numbered backups of files that already have numbered backups,
228 and simple backups of the others. */
229 numbered_existing_backups,
231 /* Make numbered backups of every file. */
235 /* Two tables describing arguments (keys) and their corresponding
237 static const char *const backup_args[] =
246 static const enum backup_type backup_vals[] =
248 no_backups, no_backups, no_backups,
249 simple_backups, simple_backups,
250 numbered_existing_backups, numbered_existing_backups,
251 numbered_backups, numbered_backups
255 main (int argc, const char *const *argv)
258 enum backup_type backup_type = no_backups;
260 program_name = (char *) argv[0];
264 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
268 if ((cp = getenv ("VERSION_CONTROL")))
269 backup_type = XARGMATCH ("$VERSION_CONTROL", cp,
270 backup_args, backup_vals);
273 backup_type = XARGMATCH (program_name, argv[1],
274 backup_args, backup_vals);
276 printf ("The version control is `%s'\n",
277 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));