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- /*
- * Copyright (c) 1985 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.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 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 5.7 (Berkeley) 2/23/91";
- #endif /* LIBC_SCCS and not lint */
-
- #define _KERNEL
- #include "ixemul.h"
- #include <memory.h>
- #include <ctype.h>
- #include <stdio.h>
- #include <sys/stat.h>
-
- #define SHELLS "etc:shells"
-
- /*
- * Do not add local shells here. They should be added in /etc/shells
- */
- static char *okshells[] =
- { "/bin/sh", "/bin/csh", 0 };
-
- static char **shells = NULL, *strings = NULL;
- static char **curshell = NULL;
- static char **initshells(void);
-
- /*
- * Get a list of shells from SHELLS, if it exists.
- */
- char *
- getusershell(void) {
- char *ret;
-
- if (curshell == NULL)
- curshell = initshells();
-
- ret = *curshell;
- if (ret != NULL)
- curshell++;
-
- return (ret);
- }
-
- void
- endusershell(void) {
- if (shells != NULL)
- syscall(SYS_free,(char *)shells);
-
- shells = NULL;
- if (strings != NULL)
- syscall(SYS_free,strings);
-
- strings = NULL;
- curshell = NULL;
- }
-
- void
- setusershell(void) {
- curshell = initshells();
- }
-
- static char **
- initshells(void) {
- register char **sp, *cp;
- register FILE *fp;
- struct stat statb;
-
- if (shells != NULL)
- syscall(SYS_free,(char *)shells);
-
- shells = NULL;
- if (strings != NULL)
- syscall(SYS_free,strings);
-
- strings = NULL;
- if ((fp = (FILE *)syscall(SYS_fopen,SHELLS, "r")) == (FILE *)0)
- return(okshells);
-
- if (syscall(SYS_fstat,fileno(fp), &statb) == -1) {
- (void)syscall(SYS_fclose,fp);
- return(okshells);
- }
-
- if ((strings = (char *)syscall(SYS_malloc,(unsigned)statb.st_size + 1)) == NULL) {
- (void)syscall(SYS_fclose,fp);
- return(okshells);
- }
-
- shells = (char **)syscall(SYS_calloc,(unsigned)statb.st_size / 3, sizeof (char *));
- if (shells == NULL) {
- (void)syscall(SYS_fclose,fp);
- syscall(SYS_free,strings);
- strings = NULL;
- return(okshells);
- }
-
- sp = shells;
- cp = strings;
- while (syscall(SYS_fgets,cp, MAXPATHLEN + 1, fp) != NULL) {
- while (isspace(*cp) && *cp != '\0')
- cp++;
-
- if (*cp == '#' || *cp == '\0')
- continue;
-
- *sp++ = cp;
- while (!isspace(*cp) && *cp != '#' && *cp != '\0')
- cp++;
-
- *cp++ = '\0';
- }
- *sp = (char *)0;
- (void)syscall(SYS_fclose,fp);
- return (shells);
- }
-