1 /* argmatch.c -- find a match for a string in an array
2 Copyright (C) 1990, 1998, 1999, 2001, 2002 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software Foundation,
16 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
18 /* Written by David MacKenzie <djm@ai.mit.edu>
19 Modified by Akim Demaille <demaille@inf.enst.fr> */
33 #define _(msgid) gettext (msgid)
38 #include "unlocked-io.h"
40 /* When reporting an invalid argument, show nonprinting characters
41 by using the quoting style ARGMATCH_QUOTING_STYLE. Do not use
42 literal_quoting_style. */
43 #ifndef ARGMATCH_QUOTING_STYLE
44 # define ARGMATCH_QUOTING_STYLE locale_quoting_style
47 /* Non failing version of argmatch call this function after failing. */
49 # define ARGMATCH_DIE exit (EXIT_FAILURE)
52 #ifdef ARGMATCH_DIE_DECL
62 /* Used by XARGMATCH and XARGCASEMATCH. See description in argmatch.h.
63 Default to __argmatch_die, but allow caller to change this at run-time. */
64 argmatch_exit_fn argmatch_die = __argmatch_die;
67 /* If ARG is an unambiguous match for an element of the
68 null-terminated array ARGLIST, return the index in ARGLIST
69 of the matched element, else -1 if it does not match any element
70 or -2 if it is ambiguous (is a prefix of more than one element).
71 If SENSITIVE, comparison is case sensitive.
73 If VALLIST is none null, use it to resolve ambiguities limited to
77 "y" is a valid argument, for `0', and "n" for `1'. */
80 __argmatch_internal (const char *arg, const char *const *arglist,
81 const char *vallist, size_t valsize,
84 int i; /* Temporary index in ARGLIST. */
85 size_t arglen; /* Length of ARG. */
86 int matchind = -1; /* Index of first nonexact match. */
87 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
89 arglen = strlen (arg);
91 /* Test all elements for either exact match or abbreviated matches. */
92 for (i = 0; arglist[i]; i++)
95 ? !strncmp (arglist[i], arg, arglen)
96 : !strncasecmp (arglist[i], arg, arglen))
98 if (strlen (arglist[i]) == arglen)
99 /* Exact match found. */
101 else if (matchind == -1)
102 /* First nonexact match found. */
106 /* Second nonexact match found. */
108 || memcmp (vallist + valsize * matchind,
109 vallist + valsize * i, valsize))
111 /* There is a real ambiguity, or we could not
124 /* argmatch - case sensitive version */
126 argmatch (const char *arg, const char *const *arglist,
127 const char *vallist, size_t valsize)
129 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
132 /* argcasematch - case insensitive version */
134 argcasematch (const char *arg, const char *const *arglist,
135 const char *vallist, size_t valsize)
137 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
140 /* Error reporting for argmatch.
141 CONTEXT is a description of the type of entity that was being matched.
142 VALUE is the invalid value that was given.
143 PROBLEM is the return value from argmatch. */
146 argmatch_invalid (const char *context, const char *value, int problem)
148 char const *format = (problem == -1
149 ? _("invalid argument %s for %s")
150 : _("ambiguous argument %s for %s"));
152 error (0, 0, format, quotearg_n_style (0, ARGMATCH_QUOTING_STYLE, value),
153 quote_n (1, context));
156 /* List the valid arguments for argmatch.
157 ARGLIST is the same as in argmatch.
158 VALLIST is a pointer to an array of values.
159 VALSIZE is the size of the elements of VALLIST */
161 argmatch_valid (const char *const *arglist,
162 const char *vallist, size_t valsize)
165 const char *last_val = NULL;
167 /* We try to put synonyms on the same line. The assumption is that
168 synonyms follow each other */
169 fprintf (stderr, _("Valid arguments are:"));
170 for (i = 0; arglist[i]; i++)
172 || memcmp (last_val, vallist + valsize * i, valsize))
174 fprintf (stderr, "\n - `%s'", arglist[i]);
175 last_val = vallist + valsize * i;
179 fprintf (stderr, ", `%s'", arglist[i]);
184 /* Never failing versions of the previous functions.
186 CONTEXT is the context for which argmatch is called (e.g.,
187 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
188 calls the (supposed never to return) function EXIT_FN. */
191 __xargmatch_internal (const char *context,
192 const char *arg, const char *const *arglist,
193 const char *vallist, size_t valsize,
195 argmatch_exit_fn exit_fn)
197 int res = __argmatch_internal (arg, arglist,
204 /* We failed. Explain why. */
205 argmatch_invalid (context, arg, res);
206 argmatch_valid (arglist, vallist, valsize);
209 return -1; /* To please the compilers. */
212 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
213 return the first corresponding argument in ARGLIST */
215 argmatch_to_argument (const char *value,
216 const char *const *arglist,
217 const char *vallist, size_t valsize)
221 for (i = 0; arglist[i]; i++)
222 if (!memcmp (value, vallist + valsize * i, valsize))
229 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
232 extern const char *getenv ();
234 /* When to make backup files. */
237 /* Never make backups. */
240 /* Make simple backups of every file. */
243 /* Make numbered backups of files that already have numbered backups,
244 and simple backups of the others. */
247 /* Make numbered backups of every file. */
251 /* Two tables describing arguments (keys) and their corresponding
253 static const char *const backup_args[] =
262 static const enum backup_type backup_vals[] =
266 numbered_existing, numbered_existing,
271 main (int argc, const char *const *argv)
274 enum backup_type backup_type = none;
276 program_name = (char *) argv[0];
280 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
284 if ((cp = getenv ("VERSION_CONTROL")))
285 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
286 backup_args, backup_vals);
289 backup_type = XARGCASEMATCH (program_name, argv[1],
290 backup_args, backup_vals);
292 printf ("The version control is `%s'\n",
293 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));