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4a76e37c KM |
1 | /* |
2 | * Copyright (c) 1985 Regents of the University of California. | |
73da8e88 KB |
3 | * All rights reserved. |
4 | * | |
269a7923 | 5 | * %sccs.include.redist.c% |
4a76e37c KM |
6 | */ |
7 | ||
2ce81398 | 8 | #if defined(LIBC_SCCS) && !defined(lint) |
c5980113 | 9 | static char sccsid[] = "@(#)getusershell.c 5.7 (Berkeley) %G%"; |
73da8e88 | 10 | #endif /* LIBC_SCCS and not lint */ |
4a76e37c KM |
11 | |
12 | #include <sys/param.h> | |
13 | #include <sys/file.h> | |
14 | #include <sys/stat.h> | |
15 | #include <ctype.h> | |
16 | #include <stdio.h> | |
c5980113 DS |
17 | #include <stdlib.h> |
18 | #include <unistd.h> | |
4a76e37c KM |
19 | |
20 | #define SHELLS "/etc/shells" | |
21 | ||
22 | /* | |
23 | * Do not add local shells here. They should be added in /etc/shells | |
24 | */ | |
25 | static char *okshells[] = | |
26 | { "/bin/sh", "/bin/csh", 0 }; | |
27 | ||
4a76e37c | 28 | static char **shells, *strings; |
25848be5 | 29 | static char **curshell = NULL; |
4a76e37c KM |
30 | extern char **initshells(); |
31 | ||
32 | /* | |
33 | * Get a list of shells from SHELLS, if it exists. | |
34 | */ | |
35 | char * | |
36 | getusershell() | |
37 | { | |
38 | char *ret; | |
4a76e37c | 39 | |
25848be5 JB |
40 | if (curshell == NULL) |
41 | curshell = initshells(); | |
42 | ret = *curshell; | |
43 | if (ret != NULL) | |
44 | curshell++; | |
4a76e37c KM |
45 | return (ret); |
46 | } | |
47 | ||
c5980113 | 48 | void |
4a76e37c KM |
49 | endusershell() |
50 | { | |
51 | ||
52 | if (shells != NULL) | |
53 | free((char *)shells); | |
54 | shells = NULL; | |
55 | if (strings != NULL) | |
56 | free(strings); | |
57 | strings = NULL; | |
25848be5 | 58 | curshell = NULL; |
4a76e37c KM |
59 | } |
60 | ||
c5980113 | 61 | void |
4a76e37c KM |
62 | setusershell() |
63 | { | |
64 | ||
25848be5 | 65 | curshell = initshells(); |
4a76e37c KM |
66 | } |
67 | ||
68 | static char ** | |
69 | initshells() | |
70 | { | |
71 | register char **sp, *cp; | |
72 | register FILE *fp; | |
73 | struct stat statb; | |
4a76e37c | 74 | |
4a76e37c KM |
75 | if (shells != NULL) |
76 | free((char *)shells); | |
77 | shells = NULL; | |
78 | if (strings != NULL) | |
79 | free(strings); | |
80 | strings = NULL; | |
81 | if ((fp = fopen(SHELLS, "r")) == (FILE *)0) | |
82 | return(okshells); | |
83 | if (fstat(fileno(fp), &statb) == -1) { | |
84 | (void)fclose(fp); | |
85 | return(okshells); | |
86 | } | |
87 | if ((strings = malloc((unsigned)statb.st_size)) == NULL) { | |
88 | (void)fclose(fp); | |
89 | return(okshells); | |
90 | } | |
91 | shells = (char **)calloc((unsigned)statb.st_size / 3, sizeof (char *)); | |
92 | if (shells == NULL) { | |
93 | (void)fclose(fp); | |
94 | free(strings); | |
95 | strings = NULL; | |
96 | return(okshells); | |
97 | } | |
98 | sp = shells; | |
99 | cp = strings; | |
100 | while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) { | |
25848be5 | 101 | while (*cp != '#' && *cp != '/' && *cp != '\0') |
4a76e37c | 102 | cp++; |
25848be5 | 103 | if (*cp == '#' || *cp == '\0') |
4a76e37c KM |
104 | continue; |
105 | *sp++ = cp; | |
106 | while (!isspace(*cp) && *cp != '#' && *cp != '\0') | |
107 | cp++; | |
108 | *cp++ = '\0'; | |
109 | } | |
110 | *sp = (char *)0; | |
111 | (void)fclose(fp); | |
112 | return (shells); | |
113 | } |