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/*
* 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>
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)
#else
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)
{
if (shells != NULL) {
free(shells);
}
shells = NULL;
if (strings != 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;
}
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