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 c_quoting_style
49 extern char *program_name;
51 /* If ARG is an unambiguous match for an element of the
52 null-terminated array ARGLIST, return the index in ARGLIST
53 of the matched element, else -1 if it does not match any element
54 or -2 if it is ambiguous (is a prefix of more than one element).
55 If SENSITIVE, comparison is case sensitive.
57 If VALLIST is none null, use it to resolve ambiguities limited to
61 "y" is a valid argument, for `0', and "n" for `1'. */
64 __argmatch_internal (const char *arg, const char *const *arglist,
65 const char *vallist, size_t valsize,
68 int i; /* Temporary index in ARGLIST. */
69 size_t arglen; /* Length of ARG. */
70 int matchind = -1; /* Index of first nonexact match. */
71 int ambiguous = 0; /* If nonzero, multiple nonexact match(es). */
73 arglen = strlen (arg);
75 /* Test all elements for either exact match or abbreviated matches. */
76 for (i = 0; arglist[i]; i++)
79 ? !strncmp (arglist[i], arg, arglen)
80 : !strncasecmp (arglist[i], arg, arglen))
82 if (strlen (arglist[i]) == arglen)
83 /* Exact match found. */
85 else if (matchind == -1)
86 /* First nonexact match found. */
90 /* Second nonexact match found. */
92 || memcmp (vallist + valsize * matchind,
93 vallist + valsize * i, valsize))
95 /* There is a real ambiguity, or we could not
108 /* argmatch - case sensitive version */
110 argmatch (const char *arg, const char *const *arglist,
111 const char *vallist, size_t valsize)
113 return __argmatch_internal (arg, arglist, vallist, valsize, 1);
116 /* argcasematch - case insensitive version */
118 argcasematch (const char *arg, const char *const *arglist,
119 const char *vallist, size_t valsize)
121 return __argmatch_internal (arg, arglist, vallist, valsize, 0);
124 /* Error reporting for argmatch.
125 KIND is a description of the type of entity that was being matched.
126 VALUE is the invalid value that was given.
127 PROBLEM is the return value from argmatch. */
130 argmatch_invalid (const char *kind, const char *value, int problem)
132 enum quoting_style saved_quoting_style;
134 /* Make sure to have a good quoting style to report errors.
135 literal is insane here. */
136 saved_quoting_style = get_quoting_style (NULL);
137 set_quoting_style (NULL, ARGMATCH_QUOTING_STYLE);
139 /* There is an error */
140 fprintf (stderr, "%s: ", program_name);
142 fprintf (stderr, _("invalid argument %s for `%s'"),
143 quotearg (value), kind);
144 else /* Assume -2. */
145 fprintf (stderr, _("ambiguous argument %s for `%s'"),
146 quotearg (value), kind);
149 set_quoting_style (NULL, saved_quoting_style);
152 /* List the valid arguments for argmatch.
153 ARGLIST is the same as in argmatch.
154 VALLIST is a pointer to an array of values.
155 VALSIZE is the size of the elements of VALLIST */
157 argmatch_valid (const char *const *arglist,
158 const char *vallist, size_t valsize)
161 const char *last_val = NULL;
163 /* We try to put synonyms on the same line. The assumption is that
164 synonyms follow each other */
165 fprintf (stderr, _("Valid arguments are:"));
166 for (i = 0; arglist[i]; i++)
168 || memcmp (last_val, vallist + valsize * i, valsize))
170 fprintf (stderr, "\n - `%s'", arglist[i]);
171 last_val = vallist + valsize * i;
175 fprintf (stderr, ", `%s'", arglist[i]);
180 /* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
181 return the first corresponding argument in ARGLIST */
183 argmatch_to_argument (const char *value,
184 const char *const *arglist,
185 const char *vallist, size_t valsize)
189 for (i = 0; arglist[i]; i++)
190 if (!memcmp (value, vallist + valsize * i, valsize))
197 * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
200 extern const char *getenv ();
202 /* When to make backup files. */
205 /* Never make backups. */
208 /* Make simple backups of every file. */
211 /* Make numbered backups of files that already have numbered backups,
212 and simple backups of the others. */
215 /* Make numbered backups of every file. */
219 /* Two tables describing arguments (keys) and their corresponding
221 static const char *const backup_args[] =
230 static const enum backup_type backup_vals[] =
234 numbered_existing, numbered_existing,
239 main (int argc, const char *const *argv)
242 enum backup_type backup_type = none;
244 program_name = (char *) argv[0];
248 fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
252 if ((cp = getenv ("VERSION_CONTROL")))
253 backup_type = XARGCASEMATCH ("$VERSION_CONTROL", cp,
254 backup_args, backup_vals);
257 backup_type = XARGCASEMATCH (program_name, argv[1],
258 backup_args, backup_vals);
260 printf ("The version control is `%s'\n",
261 ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));