1/* 2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. Please obtain a copy of the License at 10 * http://www.opensource.apple.com/apsl/ and read it before using this 11 * file. 12 * 13 * The Original Code and all software distributed under the License are 14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 18 * Please see the License for the specific language governing rights and 19 * limitations under the License. 20 * 21 * @APPLE_LICENSE_HEADER_END@ 22 */ 23/* 24 * Copyright (c) 1985, 1993 25 * The Regents of the University of California. All rights reserved. 26 * 27 * Redistribution and use in source and binary forms, with or without 28 * modification, are permitted provided that the following conditions 29 * are met: 30 * 1. Redistributions of source code must retain the above copyright 31 * notice, this list of conditions and the following disclaimer. 32 * 2. Redistributions in binary form must reproduce the above copyright 33 * notice, this list of conditions and the following disclaimer in the 34 * documentation and/or other materials provided with the distribution. 35 * 3. All advertising materials mentioning features or use of this software 36 * must display the following acknowledgement: 37 * This product includes software developed by the University of 38 * California, Berkeley and its contributors. 39 * 4. Neither the name of the University nor the names of its contributors 40 * may be used to endorse or promote products derived from this software 41 * without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 46 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 53 * SUCH DAMAGE. 54 */ 55 56#include "xlocale_private.h" 57 58#include <sys/param.h> 59#include <sys/file.h> 60#include <sys/stat.h> 61#include <stdio.h> 62#include <ctype.h> 63#include <stdlib.h> 64#include <unistd.h> 65#include <paths.h> 66 67/* 68 * Local shells should NOT be added here. They should be added in 69 * /etc/shells. 70 */ 71 72static const char * const okshells[] = { _PATH_BSHELL, _PATH_CSHELL, NULL }; 73static char **curshell, **shells, *strings; 74static char **initshells(void); 75 76/* 77 * Get a list of shells from _PATH_SHELLS, if it exists. 78 */ 79char * 80getusershell(void) 81{ 82 char *ret; 83 84 if (curshell == NULL) 85 curshell = initshells(); 86 ret = *curshell; 87 if (ret != NULL) 88 curshell++; 89 return (ret); 90} 91 92void 93endusershell(void) 94{ 95 if (shells != NULL) 96 free(shells); 97 shells = NULL; 98 if (strings != NULL) 99 free(strings); 100 strings = NULL; 101 curshell = NULL; 102} 103 104void 105setusershell(void) 106{ 107 curshell = initshells(); 108} 109 110static char ** 111initshells(void) 112{ 113 register char **sp, *cp; 114 register FILE *fp; 115 struct stat statb; 116 locale_t loc = __current_locale(); 117 118 if (shells != NULL) 119 free(shells); 120 shells = NULL; 121 if (strings != NULL) 122 free(strings); 123 strings = NULL; 124 if ((fp = fopen(_PATH_SHELLS, "r")) == NULL) 125 return ((char **)okshells); 126 if (fstat(fileno(fp), &statb) == -1) { 127 (void)fclose(fp); 128 return ((char **)okshells); 129 } 130 if ((strings = malloc((u_int)statb.st_size)) == NULL) { 131 (void)fclose(fp); 132 return ((char **)okshells); 133 } 134 shells = calloc((unsigned)statb.st_size / 3, sizeof (char *)); 135 if (shells == NULL) { 136 (void)fclose(fp); 137 free(strings); 138 strings = NULL; 139 return ((char **)okshells); 140 } 141 sp = shells; 142 cp = strings; 143 while (fgets(cp, MAXPATHLEN + 1, fp) != NULL) { 144 while (*cp != '#' && *cp != '/' && *cp != '\0') 145 cp++; 146 if (*cp == '#' || *cp == '\0') 147 continue; 148 *sp++ = cp; 149 while (!isspace_l(*cp, loc) && *cp != '#' && *cp != '\0') 150 cp++; 151 *cp++ = '\0'; 152 } 153 *sp = NULL; 154 (void)fclose(fp); 155 return (shells); 156} 157