1 /* argmatch.c -- find a match for a string in an array
2 Copyright (C) 1990, 1998, 1999 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> */
34 # define _(Text) gettext (Text)
41 /* When reporting a failing argument, make sure to show invisible
42 characters hidden using the quoting style
43 ARGMATCH_QUOTING_STYLE. literal_quoting_style is not good. */
45 #ifndef ARGMATCH_QUOTING_STYLE
46 # define ARGMATCH_QUOTING_STYLE escape_quoting_style
49 extern char *program_name;
51 /* The following test is to work around the gross typo in
52 systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
53 is defined to 0, not 1. */
56 # define EXIT_FAILURE 1
59 /* Non failing version of argmatch call this function after failing. */
61 # define ARGMATCH_DIE exit (EXIT_FAILURE)
64 #ifdef ARGMATCH_DIE_DECL
74 argmatch_exit_fn argmatch_die = __argmatch_die;
76 /* If ARG is an unambiguous match for an element of the
77 null-terminated array ARGLIST, return the index in ARGLIST
78 of the matched element, else -1 if it does not match any element
79 or -2 if it is ambiguous (is a prefix of more than one element).
80 If SENSITIVE, comparison is case sensitive.
82 If VALLIST is none null, use it to resolve ambiguities limited to
86 "y" is a valid argument, for `0', and "n" for `1'. */
89 __argmatch_internal (const char *arg, const char *const *arglist,
90 const char *vallist, size_t valsize,
93 int i; /* Temporary index in ARGLIST. */
94 size_t arglen; /* Length of ARG. */
95 int matchind = -1; /* Index of first nonexact match. */
96 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
98 arglen = strlen (arg);
100 /* Test all elements for either exact match or abbreviated matches. */
101 for (i = 0; arglist[i]; i++)
104 ? !strncmp (arglist[i], arg, arglen)
105 : !strncasecmp (arglist[i], arg, arglen))
107 if (strlen (arglist[i]) == arglen)
108 /* Exact match found. */
110 else if (matchind == -1)
111 /* First nonexact match found. */
115 /* Second nonexact match found. */
117 || memcmp (vallist + valsize * matchind,
118 vallist + valsize * i, valsize))
120 /* There is a real ambiguity, or we could not
133 /* argmatch - case sensitive version */
135 argmatch (const char *arg, const char *const *arglist,
136 const char *vallist, size_t valsize)
138 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
141 /* argcasematch - case insensitive version */
143 argcasematch (const char *arg, const char *const *arglist,
144 const char *vallist, size_t valsize)
146 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
149 /* Error reporting for argmatch.
150 CONTEXT is a description of the type of entity that was being matched.
151 VALUE is the invalid value that was given.
152 PROBLEM is the return value from argmatch. */
155 argmatch_invalid (const char *context, const char *value, int problem)
157 enum quoting_style saved_quoting_style;
160 /* Make sure to have a good quoting style to report errors.
161 literal is insane here. */
162 saved_quoting_style = get_quoting_style (NULL);
163 set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE);
165 format = (problem == -1
166 ? _("%s: invalid argument `%s' for `%s'\n")
167 : _("%s: ambiguous argument `%s' for `%s'\n"));
169 fprintf (stderr, format, program_name, quotearg (value), context);
171 set_quoting_style (NULL, saved_quoting_style);
174 /* List the valid arguments for argmatch.
175 ARGLIST is the same as in argmatch.
176 VALLIST is a pointer to an array of values.
177 VALSIZE is the size of the elements of VALLIST */
179 argmatch_valid (const char *const *arglist,
180 const char *vallist, size_t valsize)
183 const char *last_val = NULL;
185 /* We try to put synonyms on the same line. The assumption is that
186 synonyms follow each other */
187 fprintf (stderr, _("Valid arguments are:"));
188 for (i = 0; arglist[i]; i++)
190 || memcmp (last_val, vallist + valsize * i, valsize))
192 fprintf (stderr, "\n - `%s'", arglist[i]);
193 last_val = vallist + valsize * i;
197 fprintf (stderr, ", `%s'", arglist[i]);
202 /* Never failing versions of the previous functions.
204 CONTEXT is the context for which argmatch is called (e.g.,
205 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
206 calls the (supposed never to return) function EXIT_FN. */
209 __xargmatch_internal (const char *context,
210 const char *arg, const char *const *arglist,
211 const char *vallist, size_t valsize,
213 argmatch_exit_fn exit_fn)
215 int res = __argmatch_internal (arg, arglist,
222 /* We failed. Explain why. */
223 argmatch_invalid (context, arg, res);
224 argmatch_valid (arglist, vallist, valsize);
227 return -1; /* To please the compilers. */
230 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
231 return the first corresponding argument in ARGLIST */
233 argmatch_to_argument (const char *value,
234 const char *const *arglist,
235 const char *vallist, size_t valsize)
239 for (i = 0; arglist[i]; i++)
240 if (!memcmp (value, vallist + valsize * i, valsize))
247 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
250 extern const char *getenv ();
252 /* When to make backup files. */
255 /* Never make backups. */
258 /* Make simple backups of every file. */
261 /* Make numbered backups of files that already have numbered backups,
262 and simple backups of the others. */
265 /* Make numbered backups of every file. */
269 /* Two tables describing arguments (keys) and their corresponding
271 static const char *const backup_args[] =
280 static const enum backup_type backup_vals[] =
284 numbered_existing, numbered_existing,
289 main (int argc, const char *const *argv)
292 enum backup_type backup_type = none;
294 program_name = (char *) argv[0];
298 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
302 if ((cp = getenv ("VERSION_CONTROL")))
303 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
304 backup_args, backup_vals);
307 backup_type = XARGCASEMATCH (program_name, argv[1],
308 backup_args, backup_vals);
310 printf ("The version control is `%s'\n",
311 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));