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4a76e37c KM |
1 | /* |
2 | * Copyright (c) 1985 Regents of the University of California. | |
73da8e88 KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
4a76e37c KM |
16 | */ |
17 | ||
2ce81398 | 18 | #if defined(LIBC_SCCS) && !defined(lint) |
73da8e88 KB |
19 | static char sccsid[] = "@(#)getusershell.c 5.5 (Berkeley) %G%"; |
20 | #endif /* LIBC_SCCS and not lint */ | |
4a76e37c KM |
21 | |
22 | #include <sys/param.h> | |
23 | #include <sys/file.h> | |
24 | #include <sys/stat.h> | |
25 | #include <ctype.h> | |
26 | #include <stdio.h> | |
27 | ||
28 | #define SHELLS "/etc/shells" | |
29 | ||
30 | /* | |
31 | * Do not add local shells here. They should be added in /etc/shells | |
32 | */ | |
33 | static char *okshells[] = | |
34 | { "/bin/sh", "/bin/csh", 0 }; | |
35 | ||
4a76e37c | 36 | static char **shells, *strings; |
25848be5 | 37 | static char **curshell = NULL; |
4a76e37c KM |
38 | extern char **initshells(); |
39 | ||
40 | /* | |
41 | * Get a list of shells from SHELLS, if it exists. | |
42 | */ | |
43 | char * | |
44 | getusershell() | |
45 | { | |
46 | char *ret; | |
4a76e37c | 47 | |
25848be5 JB |
48 | if (curshell == NULL) |
49 | curshell = initshells(); | |
50 | ret = *curshell; | |
51 | if (ret != NULL) | |
52 | curshell++; | |
4a76e37c KM |
53 | return (ret); |
54 | } | |
55 | ||
56 | endusershell() | |
57 | { | |
58 | ||
59 | if (shells != NULL) | |
60 | free((char *)shells); | |
61 | shells = NULL; | |
62 | if (strings != NULL) | |
63 | free(strings); | |
64 | strings = NULL; | |
25848be5 | 65 | curshell = NULL; |
4a76e37c KM |
66 | } |
67 | ||
68 | setusershell() | |
69 | { | |
70 | ||
25848be5 | 71 | curshell = initshells(); |
4a76e37c KM |
72 | } |
73 | ||
74 | static char ** | |
75 | initshells() | |
76 | { | |
77 | register char **sp, *cp; | |
78 | register FILE *fp; | |
79 | struct stat statb; | |
80 | extern char *malloc(), *calloc(); | |
81 | ||
4a76e37c KM |
82 | if (shells != NULL) |
83 | free((char *)shells); | |
84 | shells = NULL; | |
85 | if (strings != NULL) | |
86 | free(strings); | |
87 | strings = NULL; | |
88 | if ((fp = fopen(SHELLS, "r")) == (FILE *)0) | |
89 | return(okshells); | |
90 | if (fstat(fileno(fp), &statb) == -1) { | |
91 | (void)fclose(fp); | |
92 | return(okshells); | |
93 | } | |
94 | if ((strings = malloc((unsigned)statb.st_size)) == NULL) { | |
95 | (void)fclose(fp); | |
96 | return(okshells); | |
97 | } | |
98 | shells = (char **)calloc((unsigned)statb.st_size / 3, sizeof (char *)); | |
99 | if (shells == NULL) { | |
100 | (void)fclose(fp); | |
101 | free(strings); | |
102 | strings = NULL; | |
103 | return(okshells); | |
104 | } | |
105 | sp = shells; | |
106 | cp = strings; | |
107 | while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) { | |
25848be5 | 108 | while (*cp != '#' && *cp != '/' && *cp != '\0') |
4a76e37c | 109 | cp++; |
25848be5 | 110 | if (*cp == '#' || *cp == '\0') |
4a76e37c KM |
111 | continue; |
112 | *sp++ = cp; | |
113 | while (!isspace(*cp) && *cp != '#' && *cp != '\0') | |
114 | cp++; | |
115 | *cp++ = '\0'; | |
116 | } | |
117 | *sp = (char *)0; | |
118 | (void)fclose(fp); | |
119 | return (shells); | |
120 | } |