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getusershell.c revision 1.5 
      1 /*	$NetBSD: getusershell.c,v 1.5 1995/02/27 04:13:27 cgd 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 1995/02/27 04:13:27 cgd Exp $";
     41 #endif
     42 #endif /* LIBC_SCCS and not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/file.h>
     46 #include <sys/stat.h>
     47 #include <stdio.h>
     48 #include <ctype.h>
     49 #include <stdlib.h>
     50 #include <unistd.h>
     51 #include <paths.h>
     52 
     53 /*
     54  * Local shells should NOT be added here.  They should be added in
     55  * /etc/shells.
     56  */
     57 
     58 static char *okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL };
     59 static char **curshell, **shells, *strings;
     60 static char **initshells __P((void));
     61 
     62 /*
     63  * Get a list of shells from _PATH_SHELLS, if it exists.
     64  */
     65 char *
     66 getusershell()
     67 {
     68 	char *ret;
     69 
     70 	if (curshell == NULL)
     71 		curshell = initshells();
     72 	ret = *curshell;
     73 	if (ret != NULL)
     74 		curshell++;
     75 	return (ret);
     76 }
     77 
     78 void
     79 endusershell()
     80 {
     81 
     82 	if (shells != NULL)
     83 		free(shells);
     84 	shells = NULL;
     85 	if (strings != NULL)
     86 		free(strings);
     87 	strings = NULL;
     88 	curshell = NULL;
     89 }
     90 
     91 void
     92 setusershell()
     93 {
     94 
     95 	curshell = initshells();
     96 }
     97 
     98 static char **
     99 initshells()
    100 {
    101 	register char **sp, *cp;
    102 	register FILE *fp;
    103 	struct stat statb;
    104 
    105 	if (shells != NULL)
    106 		free(shells);
    107 	shells = NULL;
    108 	if (strings != NULL)
    109 		free(strings);
    110 	strings = NULL;
    111 	if ((fp = fopen(_PATH_SHELLS, "r")) == NULL)
    112 		return (okshells);
    113 	if (fstat(fileno(fp), &statb) == -1) {
    114 		(void)fclose(fp);
    115 		return (okshells);
    116 	}
    117 	if ((strings = malloc((u_int)statb.st_size)) == NULL) {
    118 		(void)fclose(fp);
    119 		return (okshells);
    120 	}
    121 	shells = calloc((unsigned)statb.st_size / 3, sizeof (char *));
    122 	if (shells == NULL) {
    123 		(void)fclose(fp);
    124 		free(strings);
    125 		strings = NULL;
    126 		return (okshells);
    127 	}
    128 	sp = shells;
    129 	cp = strings;
    130 	while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) {
    131 		while (*cp != '#' && *cp != '/' && *cp != '\0')
    132 			cp++;
    133 		if (*cp == '#' || *cp == '\0')
    134 			continue;
    135 		*sp++ = cp;
    136 		while (!isspace(*cp) && *cp != '#' && *cp != '\0')
    137 			cp++;
    138 		*cp++ = '\0';
    139 	}
    140 	*sp = NULL;
    141 	(void)fclose(fp);
    142 	return (shells);
    143 }
    144