1 /* $OpenBSD: strtofflags.c,v 1.7 2015/08/20 21:49:29 deraadt Exp $ */ 2 3 /*- 4 * Copyright (c) 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. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 #include <sys/stat.h> 34 35 #include <stddef.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 #include <string.h> 39 40 static const struct { 41 char *name; 42 u_int32_t flag; 43 int invert; 44 } mapping[] = { 45 /* shorter names per flag first, all prefixed by "no" */ 46 { "nosappnd", SF_APPEND, 0 }, 47 { "nosappend", SF_APPEND, 0 }, 48 { "noarch", SF_ARCHIVED, 0 }, 49 { "noarchived", SF_ARCHIVED, 0 }, 50 { "noschg", SF_IMMUTABLE, 0 }, 51 { "noschange", SF_IMMUTABLE, 0 }, 52 { "nosimmutable", SF_IMMUTABLE, 0 }, 53 #ifdef __FreeBSD__ 54 { "nosunlnk", SF_NOUNLINK, 0 }, 55 { "nosunlink", SF_NOUNLINK, 0 }, 56 #endif 57 { "nouappnd", UF_APPEND, 0 }, 58 { "nouappend", UF_APPEND, 0 }, 59 { "nouchg", UF_IMMUTABLE, 0 }, 60 { "nouchange", UF_IMMUTABLE, 0 }, 61 { "nouimmutable", UF_IMMUTABLE, 0 }, 62 { "nodump", UF_NODUMP, 1 }, 63 { "noopaque", UF_OPAQUE, 0 }, 64 #ifdef __FreeBSD__ 65 { "nouunlnk", UF_NOUNLINK, 0 }, 66 { "nouunlink", UF_NOUNLINK, 0 } 67 #endif 68 }; 69 #define longestflaglen 12 70 #define nmappings (sizeof(mapping) / sizeof(mapping[0])) 71 72 /* 73 * fflagstostr -- 74 * Convert file flags to a comma-separated string. If no flags 75 * are set, return the empty string. 76 */ 77 char * 78 fflagstostr(u_int32_t flags) 79 { 80 char *string; 81 char *sp, *dp; 82 u_int32_t setflags; 83 int i; 84 85 if ((string = calloc(nmappings, longestflaglen + 1)) == NULL) 86 return (NULL); 87 88 setflags = flags; 89 dp = string; 90 for (i = 0; i < nmappings; i++) { 91 if (setflags & mapping[i].flag) { 92 if (dp > string) 93 *dp++ = ','; 94 for (sp = mapping[i].invert ? mapping[i].name : 95 mapping[i].name + 2; *sp; *dp++ = *sp++) ; 96 setflags &= ~mapping[i].flag; 97 } 98 } 99 *dp = '\0'; 100 return (string); 101 } 102 103 /* 104 * strtofflags -- 105 * Take string of arguments and return file flags. Return 0 on 106 * success, 1 on failure. On failure, stringp is set to point 107 * to the offending token. 108 */ 109 int 110 strtofflags(char **stringp, u_int32_t *setp, u_int32_t *clrp) 111 { 112 char *string, *p; 113 int i; 114 115 if (setp) 116 *setp = 0; 117 if (clrp) 118 *clrp = 0; 119 string = *stringp; 120 while ((p = strsep(&string, "\t ,")) != NULL) { 121 *stringp = p; 122 if (*p == '\0') 123 continue; 124 for (i = 0; i < nmappings; i++) { 125 if (strcmp(p, mapping[i].name + 2) == 0) { 126 if (mapping[i].invert) { 127 if (clrp) 128 *clrp |= mapping[i].flag; 129 } else { 130 if (setp) 131 *setp |= mapping[i].flag; 132 } 133 break; 134 } else if (strcmp(p, mapping[i].name) == 0) { 135 if (mapping[i].invert) { 136 if (setp) 137 *setp |= mapping[i].flag; 138 } else { 139 if (clrp) 140 *clrp |= mapping[i].flag; 141 } 142 break; 143 } 144 } 145 if (i == nmappings) 146 return 1; 147 } 148 return 0; 149 } 150