144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)getusershell.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#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>
|
|
|
|
/*
|
|
* Local shells should NOT be added here. They should be added in
|
|
* /etc/shells.
|
|
*/
|
|
|
|
/* NB: we do not initialize okshells here. The initialization needs
|
|
relocations. These interfaces are used so rarely that this is not
|
|
justified. Instead explicitly initialize the array when it is
|
|
used. */
|
|
#if 0
|
|
static const char *const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
|
|
#else
|
|
static const char *okshells[3];
|
|
#endif
|
|
static char **curshell, **shells, *strings;
|
|
static char **initshells (void) __THROW;
|
|
|
|
/*
|
|
* Get a list of shells from _PATH_SHELLS, if it exists.
|
|
*/
|
|
char *
|
|
getusershell()
|
|
{
|
|
char *ret;
|
|
|
|
if (curshell == NULL)
|
|
curshell = initshells();
|
|
ret = *curshell;
|
|
if (ret != NULL)
|
|
curshell++;
|
|
return (ret);
|
|
}
|
|
|
|
void
|
|
endusershell()
|
|
{
|
|
|
|
free(shells);
|
|
shells = NULL;
|
|
free(strings);
|
|
strings = NULL;
|
|
curshell = NULL;
|
|
}
|
|
|
|
void
|
|
setusershell()
|
|
{
|
|
|
|
curshell = initshells();
|
|
}
|
|
|
|
static char **
|
|
initshells()
|
|
{
|
|
register char **sp, *cp;
|
|
register FILE *fp;
|
|
struct stat64 statb;
|
|
size_t flen;
|
|
|
|
free(shells);
|
|
shells = NULL;
|
|
free(strings);
|
|
strings = NULL;
|
|
if ((fp = fopen(_PATH_SHELLS, "rc")) == NULL)
|
|
goto init_okshells_noclose;
|
|
if (fstat64(fileno(fp), &statb) == -1) {
|
|
init_okshells:
|
|
(void)fclose(fp);
|
|
init_okshells_noclose:
|
|
okshells[0] = _PATH_BSHELL;
|
|
okshells[1] = _PATH_CSHELL;
|
|
return (char **) okshells;
|
|
}
|
|
if (statb.st_size > ~(size_t)0 / sizeof (char *) * 3)
|
|
goto init_okshells;
|
|
flen = statb.st_size + 3;
|
|
if ((strings = malloc(flen)) == NULL)
|
|
goto init_okshells;
|
|
shells = malloc(statb.st_size / 3 * sizeof (char *));
|
|
if (shells == NULL) {
|
|
free(strings);
|
|
strings = NULL;
|
|
goto init_okshells;
|
|
}
|
|
sp = shells;
|
|
cp = strings;
|
|
while (fgets_unlocked(cp, flen - (cp - strings), fp) != NULL) {
|
|
while (*cp != '#' && *cp != '/' && *cp != '\0')
|
|
cp++;
|
|
if (*cp == '#' || *cp == '\0' || cp[1] == '\0')
|
|
continue;
|
|
*sp++ = cp;
|
|
while (!isspace(*cp) && *cp != '#' && *cp != '\0')
|
|
cp++;
|
|
*cp++ = '\0';
|
|
}
|
|
*sp = NULL;
|
|
(void)fclose(fp);
|
|
return (shells);
|
|
}
|