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)
70 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).
76 If SENSITIVE, comparison is case sensitive.
78 If VALLIST is none null, use it to resolve ambiguities limited to
82 "y" is a valid argument, for `0', and "n" for `1'. */
85 __argmatch_internal (const char *arg, const char *const *arglist,
86 const char *vallist, size_t valsize,
89 int i; /* Temporary index in ARGLIST. */
90 size_t arglen; /* Length of ARG. */
91 int matchind = -1; /* Index of first nonexact match. */
92 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
94 arglen = strlen (arg);
96 /* Test all elements for either exact match or abbreviated matches. */
97 for (i = 0; arglist[i]; i++)
100 ? !strncmp (arglist[i], arg, arglen)
101 : !strncasecmp (arglist[i], arg, arglen))
103 if (strlen (arglist[i]) == arglen)
104 /* Exact match found. */
106 else if (matchind == -1)
107 /* First nonexact match found. */
111 /* Second nonexact match found. */
113 || memcmp (vallist + valsize * matchind,
114 vallist + valsize * i, valsize))
116 /* There is a real ambiguity, or we could not
129 /* argmatch - case sensitive version */
131 argmatch (const char *arg, const char *const *arglist,
132 const char *vallist, size_t valsize)
134 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
137 /* argcasematch - case insensitive version */
139 argcasematch (const char *arg, const char *const *arglist,
140 const char *vallist, size_t valsize)
142 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
145 /* Error reporting for argmatch.
146 CONTEXT is a description of the type of entity that was being matched.
147 VALUE is the invalid value that was given.
148 PROBLEM is the return value from argmatch. */
151 argmatch_invalid (const char *context, const char *value, int problem)
153 enum quoting_style saved_quoting_style;
156 /* Make sure to have a good quoting style to report errors.
157 literal is insane here. */
158 saved_quoting_style = get_quoting_style (NULL);
159 set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE);
161 format = (problem == -1
162 ? _("%s: invalid argument `%s' for `%s'\n")
163 : _("%s: ambiguous argument `%s' for `%s'\n"));
165 fprintf (stderr, format, program_name, quotearg (value), context);
167 set_quoting_style (NULL, saved_quoting_style);
170 /* List the valid arguments for argmatch.
171 ARGLIST is the same as in argmatch.
172 VALLIST is a pointer to an array of values.
173 VALSIZE is the size of the elements of VALLIST */
175 argmatch_valid (const char *const *arglist,
176 const char *vallist, size_t valsize)
179 const char *last_val = NULL;
181 /* We try to put synonyms on the same line. The assumption is that
182 synonyms follow each other */
183 fprintf (stderr, _("Valid arguments are:"));
184 for (i = 0; arglist[i]; i++)
186 || memcmp (last_val, vallist + valsize * i, valsize))
188 fprintf (stderr, "\n - `%s'", arglist[i]);
189 last_val = vallist + valsize * i;
193 fprintf (stderr, ", `%s'", arglist[i]);
198 /* Never failing versions of the previous functions.
200 CONTEXT is the context for which argmatch is called (e.g.,
201 "--version-control", or "$VERSION_CONTROL" etc.). Upon failure,
202 calls the (supposed never to return) function EXIT_FN. */
205 __xargmatch_internal (const char *context,
206 const char *arg, const char *const *arglist,
207 const char *vallist, size_t valsize,
209 argmatch_exit_fn exit_fn)
211 int res = __argmatch_internal (arg, arglist,
218 /* We failed. Explain why. */
219 argmatch_invalid (context, arg, res);
220 argmatch_valid (arglist, vallist, valsize);
223 return -1; /* To please the compilers. */
226 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
227 return the first corresponding argument in ARGLIST */
229 argmatch_to_argument (const char *value,
230 const char *const *arglist,
231 const char *vallist, size_t valsize)
235 for (i = 0; arglist[i]; i++)
236 if (!memcmp (value, vallist + valsize * i, valsize))
243 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
246 extern const char *getenv ();
248 /* When to make backup files. */
251 /* Never make backups. */
254 /* Make simple backups of every file. */
257 /* Make numbered backups of files that already have numbered backups,
258 and simple backups of the others. */
261 /* Make numbered backups of every file. */
265 /* Two tables describing arguments (keys) and their corresponding
267 static const char *const backup_args[] =
276 static const enum backup_type backup_vals[] =
280 numbered_existing, numbered_existing,
285 main (int argc, const char *const *argv)
288 enum backup_type backup_type = none;
290 program_name = (char *) argv[0];
294 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
298 if ((cp = getenv ("VERSION_CONTROL")))
299 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
300 backup_args, backup_vals);
303 backup_type = XARGCASEMATCH (program_name, argv[1],
304 backup_args, backup_vals);
306 printf ("The version control is `%s'\n",
307 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));