1 /* setusershell(), getusershell(), endusershell() for uClibc.
2 *
3 * Copyright (C) 2010 Bernhard Reutner-Fischer <uclibc@uclibc.org>
4 *
5 * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in
6 * this tarball.
7 */
8 /* My manpage reads:
9 * The getusershell() function returns the next line from the file
10 * /etc/shells, opening the file if necessary. The line should contain
11 * the pathname of a valid user shell. If /etc/shells does not exist
12 * or is unreadable, getusershell() behaves as if /bin/sh and /bin/csh
13 * were listed in the file.
14 * The getusershell() function returns a NULL pointer on end-of-file.
15 */
16 #include <unistd.h>
17 #include <stdlib.h>
18 #include <paths.h>
19 #include <string.h>
20 #include "internal/parse_config.h"
21
22 #if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
23
24 static const char * const defaultsh[] = { _PATH_BSHELL, _PATH_CSHELL, NULL};
25 static char *shellb, **shells;
26 static parser_t *shellp;
27
endusershell(void)28 void endusershell(void)
29 {
30 if (shellp) {
31 shells = (char**) shellb;
32 while (shells && *shells) {
33 char*xxx = *shells++;
34 free(xxx);
35 }
36 config_close(shellp);
37 shellp = NULL;
38 }
39 free(shellb);
40 shellb = NULL;
41 shells = NULL;
42 }
libc_hidden_def(endusershell)43 libc_hidden_def(endusershell)
44
45 void setusershell(void)
46 {
47 endusershell();
48 shellp = config_open(_PATH_SHELLS);
49 if (shellp == NULL)
50 shells = (char **)defaultsh;
51 else {
52 char **shell = NULL;
53 int pos = 0;
54
55 while (config_read(shellp, &shell, 1, 1, "# \t", PARSE_NORMAL))
56 {
57 shellb = realloc(shellb, (pos + 2) * sizeof(char*));
58 shells = (char**) shellb + pos++;
59 *shells++ = strdup(*shell);
60 *shells = NULL;
61
62 }
63 shells = (char **)shellb;
64 }
65 }
libc_hidden_def(setusershell)66 libc_hidden_def(setusershell)
67
68 char *getusershell(void)
69 {
70 char *sh;
71 if (shells == NULL)
72 setusershell();
73 sh = *shells;
74 if (sh)
75 shells++;
76 return sh;
77 }
78 #endif
79