Update.
[glibc.git] / misc / getusershell.c
blobd822f554ea20957f6b2936f29d258412a18c079a
1 /*
2 * Copyright (c) 1985, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
36 #endif /* LIBC_SCCS and not lint */
38 #include <sys/param.h>
39 #include <sys/file.h>
40 #include <sys/stat.h>
41 #include <stdio.h>
42 #include <ctype.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45 #include <paths.h>
48 * Local shells should NOT be added here. They should be added in
49 * /etc/shells.
52 static char *okshells[] = { (char *) _PATH_BSHELL, (char *) _PATH_CSHELL,
53 NULL };
54 static char **curshell, **shells, *strings;
55 static char **initshells __P((void));
58 * Get a list of shells from _PATH_SHELLS, if it exists.
60 char *
61 getusershell()
63 char *ret;
65 if (curshell == NULL)
66 curshell = initshells();
67 ret = *curshell;
68 if (ret != NULL)
69 curshell++;
70 return (ret);
73 void
74 endusershell()
77 if (shells != NULL)
78 free(shells);
79 shells = NULL;
80 if (strings != NULL)
81 free(strings);
82 strings = NULL;
83 curshell = NULL;
86 void
87 setusershell()
90 curshell = initshells();
93 static char **
94 initshells()
96 register char **sp, *cp;
97 register FILE *fp;
98 struct stat statb;
99 int flen;
101 if (shells != NULL)
102 free(shells);
103 shells = NULL;
104 if (strings != NULL)
105 free(strings);
106 strings = NULL;
107 if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
108 return (okshells);
109 if (fstat(fileno(fp), &statb) == -1) {
110 (void)fclose(fp);
111 return (okshells);
113 if ((strings = malloc((u_int)statb.st_size + 1)) == NULL) {
114 (void)fclose(fp);
115 return (okshells);
117 shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
118 if (shells == NULL) {
119 (void)fclose(fp);
120 free(strings);
121 strings = NULL;
122 return (okshells);
124 sp = shells;
125 cp = strings;
126 flen = statb.st_size;
127 while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) {
128 while (*cp != '#' && *cp != '/' && *cp != '\0')
129 cp++;
130 if (*cp == '#' || *cp == '\0')
131 continue;
132 *sp++ = cp;
133 while (!isspace(*cp) && *cp != '#' && *cp != '\0')
134 cp++;
135 *cp++ = '\0';
137 *sp = NULL;
138 (void)fclose(fp);
139 return (shells);