Home | History | Annotate | Line # | Download | only in gen
getusershell.c revision 1.5.4.1 
      1 /*	$NetBSD: getusershell.c,v 1.5.4.1 1996/09/19 20:03:10 jtc Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1985, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #if defined(LIBC_SCCS) && !defined(lint)
     37 #if 0
     38 static char sccsid[] = "@(#)getusershell.c	8.1 (Berkeley) 6/4/93";
     39 #else
     40 static char rcsid[] = "$NetBSD: getusershell.c,v 1.5.4.1 1996/09/19 20:03:10 jtc Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include "namespace.h"
     45 #include <sys/param.h>
     46 #include <sys/file.h>
     47 #include <sys/stat.h>
     48 #include <stdio.h>
     49 #include <ctype.h>
     50 #include <stdlib.h>
     51 #include <unistd.h>
     52 #include <paths.h>
     53 
     54 #ifdef __weak_alias
     55 __weak_alias(endusershell,_endusershell);
     56 __weak_alias(getusershell,_getusershell);
     57 __weak_alias(setusershell,_setusershell);
     58 #endif
     59 
     60 /*
     61  * Local shells should NOT be added here.  They should be added in
     62  * /etc/shells.
     63  */
     64 
     65 static char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
     66 static char **curshell, **shells, *strings;
     67 static char **initshells __P((void));
     68 
     69 /*
     70  * Get a list of shells from _PATH_SHELLS, if it exists.
     71  */
     72 char *
     73 getusershell()
     74 {
     75 	char *ret;
     76 
     77 	if (curshell == NULL)
     78 		curshell = initshells();
     79 	ret = *curshell;
     80 	if (ret != NULL)
     81 		curshell++;
     82 	return (ret);
     83 }
     84 
     85 void
     86 endusershell()
     87 {
     88 
     89 	if (shells != NULL)
     90 		free(shells);
     91 	shells = NULL;
     92 	if (strings != NULL)
     93 		free(strings);
     94 	strings = NULL;
     95 	curshell = NULL;
     96 }
     97 
     98 void
     99 setusershell()
    100 {
    101 
    102 	curshell = initshells();
    103 }
    104 
    105 static char **
    106 initshells()
    107 {
    108 	register char **sp, *cp;
    109 	register FILE *fp;
    110 	struct stat statb;
    111 
    112 	if (shells != NULL)
    113 		free(shells);
    114 	shells = NULL;
    115 	if (strings != NULL)
    116 		free(strings);
    117 	strings = NULL;
    118 	if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
    119 		return (okshells);
    120 	if (fstat(fileno(fp), &statb) == -1) {
    121 		(void)fclose(fp);
    122 		return (okshells);
    123 	}
    124 	if ((strings = malloc((u_int)statb.st_size)) == NULL) {
    125 		(void)fclose(fp);
    126 		return (okshells);
    127 	}
    128 	shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
    129 	if (shells == NULL) {
    130 		(void)fclose(fp);
    131 		free(strings);
    132 		strings = NULL;
    133 		return (okshells);
    134 	}
    135 	sp = shells;
    136 	cp = strings;
    137 	while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
    138 		while (*cp != '#' && *cp != '/' && *cp != '\0')
    139 			cp++;
    140 		if (*cp == '#' || *cp == '\0')
    141 			continue;
    142 		*sp++ = cp;
    143 		while (!isspace(*cp) && *cp != '#' && *cp != '\0')
    144 			cp++;
    145 		*cp++ = '\0';
    146 	}
    147 	*sp = NULL;
    148 	(void)fclose(fp);
    149 	return (shells);
    150 }
    151