1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* Copyright (c) 1985, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This version has been hevily modified for use with uClibc
* November 2002, Erik Andersen <andersen@codepoet.org>
*/
#include <sys/param.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <paths.h>
#if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_UNIX98)
libc_hidden_proto(fstat)
libc_hidden_proto(fopen)
libc_hidden_proto(fclose)
libc_hidden_proto(__fsetlocking)
libc_hidden_proto(fileno)
libc_hidden_proto(fgets_unlocked)
#ifdef __UCLIBC_HAS_XLOCALE__
libc_hidden_proto(__ctype_b_loc)
#elif __UCLIBC_HAS_CTYPE_TABLES__
libc_hidden_proto(__ctype_b)
#endif
/*
* Local shells should NOT be added here. They should be added in
* /etc/shells.
*/
static const char * const validsh[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
static char **curshell, **shells, *strings;
static char **initshells __P((void));
/*
* Get a list of shells from _PATH_SHELLS, if it exists.
*/
char * getusershell(void)
{
char *ret;
if (curshell == NULL)
curshell = initshells();
ret = *curshell;
if (ret != NULL)
curshell++;
return (ret);
}
static void __free_initshell_memory(void)
{
free(shells);
shells = NULL;
free(strings);
strings = NULL;
}
void endusershell(void)
{
__free_initshell_memory();
curshell = NULL;
}
void setusershell(void)
{
curshell = initshells();
}
static char ** initshells(void)
{
register char **sp, *cp;
register FILE *fp;
struct stat statb;
int flen;
__free_initshell_memory();
if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
return (char **) validsh;
if (fstat(fileno(fp), &statb) == -1) {
goto cleanup;
}
if ((strings = malloc((unsigned)statb.st_size + 1)) == NULL) {
goto cleanup;
}
if ((shells = calloc((unsigned)statb.st_size / 3, sizeof (char *))) == NULL) {
goto cleanup;
}
/* No threads using this stream. */
#ifdef __UCLIBC_HAS_THREADS__
__fsetlocking (fp, FSETLOCKING_BYCALLER);
#endif
sp = shells;
cp = strings;
flen = statb.st_size;
while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) {
while (*cp != '#' && *cp != '/' && *cp != '\0')
cp++;
if (*cp == '#' || *cp == '\0')
continue;
*sp++ = cp;
while (!isspace(*cp) && *cp != '#' && *cp != '\0')
cp++;
*cp++ = '\0';
}
*sp = NULL;
fclose(fp);
return (shells);
cleanup:
__free_initshell_memory();
fclose(fp);
return (char **) validsh;
}
#endif
|
