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

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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.
32 *
33 * $FreeBSD: head/lib/libc/gen/getusershell.c 52856 1999-11-04 04:16:28Z ache $
34 */
35
36#if defined(LIBC_SCCS) && !defined(lint)
37static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
38#endif /* LIBC_SCCS and not lint */
39
40#include <sys/param.h>
41#include <sys/file.h>
42#include <sys/stat.h>
43#include <stdio.h>
44#include <ctype.h>
45#include <stdlib.h>
46#include <unistd.h>
47#include <paths.h>
48
49/*
50 * Local shells should NOT be added here. They should be added in
51 * /etc/shells.
52 */
53
54static char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
55static char **curshell, **shells, *strings;
56static char **initshells __P((void));
57
58/*
59 * Get a list of shells from _PATH_SHELLS, if it exists.
60 */
61char *
62getusershell()
63{
64 char *ret;
65
66 if (curshell == NULL)
67 curshell = initshells();
68 ret = *curshell;
69 if (ret != NULL)
70 curshell++;
71 return (ret);
72}
73
74void
75endusershell()
76{
77
78 if (shells != NULL)
79 free(shells);
80 shells = NULL;
81 if (strings != NULL)
82 free(strings);
83 strings = NULL;
84 curshell = NULL;
85}
86
87void
88setusershell()
89{
90
91 curshell = initshells();
92}
93
94static char **
95initshells()
96{
97 register char **sp, *cp;
98 register FILE *fp;
99 struct stat statb;
100
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);
112 }
113 if ((strings = malloc((u_int)statb.st_size)) == NULL) {
114 (void)fclose(fp);
115 return (okshells);
116 }
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);
123 }
124 sp = shells;
125 cp = strings;
126 while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
127 while (*cp != '#' && *cp != '/' && *cp != '\0')
128 cp++;
129 if (*cp == '#' || *cp == '\0')
130 continue;
131 *sp++ = cp;
132 while (!isspace((unsigned char)*cp) && *cp != '#' && *cp != '\0')
133 cp++;
134 *cp++ = '\0';
135 }
136 *sp = NULL;
137 (void)fclose(fp);
138 return (shells);
139}