]>
Commit | Line | Data |
---|---|---|
28f540f4 RM |
1 | /* |
2 | * Copyright (c) 1985, 1993 | |
3 | * The Regents of the University of California. All rights reserved. | |
4 | * | |
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. | |
28f540f4 RM |
13 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #if defined(LIBC_SCCS) && !defined(lint) | |
31 | static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93"; | |
32 | #endif /* LIBC_SCCS and not lint */ | |
33 | ||
34 | #include <sys/param.h> | |
35 | #include <sys/file.h> | |
36 | #include <sys/stat.h> | |
37 | #include <stdio.h> | |
2706ee38 | 38 | #include <stdio_ext.h> |
28f540f4 RM |
39 | #include <ctype.h> |
40 | #include <stdlib.h> | |
41 | #include <unistd.h> | |
42 | #include <paths.h> | |
43 | ||
44 | /* | |
45 | * Local shells should NOT be added here. They should be added in | |
46 | * /etc/shells. | |
47 | */ | |
48 | ||
49f3a758 | 49 | static const char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; |
05d4c982 RM |
50 | static char **curshell, **shells, *strings; |
51 | static char **initshells __P((void)); | |
28f540f4 RM |
52 | |
53 | /* | |
54 | * Get a list of shells from _PATH_SHELLS, if it exists. | |
55 | */ | |
56 | char * | |
57 | getusershell() | |
58 | { | |
05d4c982 | 59 | char *ret; |
28f540f4 RM |
60 | |
61 | if (curshell == NULL) | |
62 | curshell = initshells(); | |
63 | ret = *curshell; | |
64 | if (ret != NULL) | |
65 | curshell++; | |
05d4c982 | 66 | return (ret); |
28f540f4 RM |
67 | } |
68 | ||
69 | void | |
70 | endusershell() | |
71 | { | |
05d4c982 | 72 | |
28f540f4 RM |
73 | if (shells != NULL) |
74 | free(shells); | |
75 | shells = NULL; | |
76 | if (strings != NULL) | |
77 | free(strings); | |
78 | strings = NULL; | |
79 | curshell = NULL; | |
80 | } | |
81 | ||
82 | void | |
83 | setusershell() | |
84 | { | |
85 | ||
86 | curshell = initshells(); | |
87 | } | |
88 | ||
05d4c982 | 89 | static char ** |
28f540f4 RM |
90 | initshells() |
91 | { | |
92 | register char **sp, *cp; | |
93 | register FILE *fp; | |
8edf6e0d | 94 | struct stat64 statb; |
71412a8c | 95 | int flen; |
28f540f4 RM |
96 | |
97 | if (shells != NULL) | |
05d4c982 | 98 | free(shells); |
28f540f4 RM |
99 | shells = NULL; |
100 | if (strings != NULL) | |
05d4c982 | 101 | free(strings); |
28f540f4 RM |
102 | strings = NULL; |
103 | if ((fp = fopen(_PATH_SHELLS, "r")) == NULL) | |
49f3a758 | 104 | return (char **) okshells; |
8edf6e0d | 105 | if (fstat64(fileno(fp), &statb) == -1) { |
28f540f4 | 106 | (void)fclose(fp); |
49f3a758 | 107 | return (char **) okshells; |
28f540f4 RM |
108 | } |
109 | if ((strings = malloc((u_int)statb.st_size + 1)) == NULL) { | |
110 | (void)fclose(fp); | |
49f3a758 | 111 | return (char **) okshells; |
28f540f4 RM |
112 | } |
113 | shells = calloc((unsigned)statb.st_size / 3, sizeof (char *)); | |
114 | if (shells == NULL) { | |
115 | (void)fclose(fp); | |
116 | free(strings); | |
117 | strings = NULL; | |
49f3a758 | 118 | return (char **) okshells; |
28f540f4 | 119 | } |
2706ee38 UD |
120 | /* No threads using this stream. */ |
121 | __fsetlocking (fp, FSETLOCKING_BYCALLER); | |
05d4c982 RM |
122 | sp = shells; |
123 | cp = strings; | |
71412a8c UD |
124 | flen = statb.st_size; |
125 | while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) { | |
28f540f4 RM |
126 | while (*cp != '#' && *cp != '/' && *cp != '\0') |
127 | cp++; | |
128 | if (*cp == '#' || *cp == '\0') | |
129 | continue; | |
130 | *sp++ = cp; | |
131 | while (!isspace(*cp) && *cp != '#' && *cp != '\0') | |
132 | cp++; | |
133 | *cp++ = '\0'; | |
134 | } | |
135 | *sp = NULL; | |
136 | (void)fclose(fp); | |
137 | return (shells); | |
138 | } |