1 /* 2 * 3 * Simple property list handling code. 4 * 5 * Copyright (c) 1998 6 * Jordan Hubbard. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer, 13 * verbatim and that no modifications are made prior to this 14 * point in the file. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * 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 AUTHOR OR HIS PETS 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, LIFE 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/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include <ctype.h> 36 #include <unistd.h> 37 #include <stdlib.h> 38 #include <stdio.h> 39 #include <string.h> 40 #include <err.h> 41 #include <sys/types.h> 42 #include <libutil.h> 43 44 static properties 45 property_alloc(char *name, char *value) 46 { 47 properties n; 48 49 if ((n = (properties)malloc(sizeof(struct _property))) == NULL) 50 return (NULL); 51 n->next = NULL; 52 if (name != NULL) { 53 if ((n->name = strdup(name)) == NULL) { 54 free(n); 55 return (NULL); 56 } 57 } else 58 n->name = NULL; 59 if (value != NULL) { 60 if ((n->value = strdup(value)) == NULL) { 61 free(n->name); 62 free(n); 63 return (NULL); 64 } 65 } else 66 n->value = NULL; 67 return (n); 68 } 69 70 properties 71 properties_read(int fd) 72 { 73 properties head, ptr; 74 char hold_n[PROPERTY_MAX_NAME + 1]; 75 char hold_v[PROPERTY_MAX_VALUE + 1]; 76 char buf[BUFSIZ * 4]; 77 int bp, n, v, max; 78 enum { LOOK, COMMENT, NAME, VALUE, MVALUE, COMMIT, FILL, STOP } state; 79 int ch = 0, blevel = 0; 80 81 n = v = bp = max = 0; 82 head = ptr = NULL; 83 state = LOOK; 84 while (state != STOP) { 85 if (state != COMMIT) { 86 if (bp == max) 87 state = FILL; 88 else 89 ch = buf[bp++]; 90 } 91 switch(state) { 92 case FILL: 93 if ((max = read(fd, buf, sizeof buf)) <= 0) { 94 state = STOP; 95 break; 96 } 97 else { 98 state = LOOK; 99 ch = buf[0]; 100 bp = 1; 101 } 102 /* FALLTHROUGH deliberately since we already have a character and state == LOOK */ 103 104 case LOOK: 105 if (isspace((unsigned char)ch)) 106 continue; 107 /* Allow shell or lisp style comments */ 108 else if (ch == '#' || ch == ';') { 109 state = COMMENT; 110 continue; 111 } 112 else if (isalnum((unsigned char)ch) || ch == '_') { 113 if (n >= PROPERTY_MAX_NAME) { 114 n = 0; 115 state = COMMENT; 116 } 117 else { 118 hold_n[n++] = ch; 119 state = NAME; 120 } 121 } 122 else 123 state = COMMENT; /* Ignore the rest of the line */ 124 break; 125 126 case COMMENT: 127 if (ch == '\n') 128 state = LOOK; 129 break; 130 131 case NAME: 132 if (ch == '\n' || !ch) { 133 hold_n[n] = '\0'; 134 hold_v[0] = '\0'; 135 v = n = 0; 136 state = COMMIT; 137 } 138 else if (isspace((unsigned char)ch)) 139 continue; 140 else if (ch == '=') { 141 hold_n[n] = '\0'; 142 v = n = 0; 143 state = VALUE; 144 } 145 else 146 hold_n[n++] = ch; 147 break; 148 149 case VALUE: 150 if (v == 0 && ch == '\n') { 151 hold_v[v] = '\0'; 152 v = n = 0; 153 state = COMMIT; 154 } 155 else if (v == 0 && isspace((unsigned char)ch)) 156 continue; 157 else if (ch == '{') { 158 state = MVALUE; 159 ++blevel; 160 } 161 else if (ch == '\n' || !ch) { 162 hold_v[v] = '\0'; 163 v = n = 0; 164 state = COMMIT; 165 } 166 else { 167 if (v >= PROPERTY_MAX_VALUE) { 168 state = COMMENT; 169 v = n = 0; 170 break; 171 } 172 else 173 hold_v[v++] = ch; 174 } 175 break; 176 177 case MVALUE: 178 /* multiline value */ 179 if (v >= PROPERTY_MAX_VALUE) { 180 warn("properties_read: value exceeds max length"); 181 state = COMMENT; 182 n = v = 0; 183 } 184 else if (ch == '}' && !--blevel) { 185 hold_v[v] = '\0'; 186 v = n = 0; 187 state = COMMIT; 188 } 189 else { 190 hold_v[v++] = ch; 191 if (ch == '{') 192 ++blevel; 193 } 194 break; 195 196 case COMMIT: 197 if (head == NULL) { 198 if ((head = ptr = property_alloc(hold_n, hold_v)) == NULL) 199 return (NULL); 200 } else { 201 if ((ptr->next = property_alloc(hold_n, hold_v)) == NULL) { 202 properties_free(head); 203 return (NULL); 204 } 205 ptr = ptr->next; 206 } 207 state = LOOK; 208 v = n = 0; 209 break; 210 211 case STOP: 212 /* we don't handle this here, but this prevents warnings */ 213 break; 214 } 215 } 216 return (head); 217 } 218 219 char * 220 property_find(properties list, const char *name) 221 { 222 if (!list || !name || !name[0]) 223 return NULL; 224 while (list) { 225 if (!strcmp(list->name, name)) 226 return list->value; 227 list = list->next; 228 } 229 return NULL; 230 } 231 232 void 233 properties_free(properties list) 234 { 235 properties tmp; 236 237 while (list) { 238 tmp = list->next; 239 if (list->name) 240 free(list->name); 241 if (list->value) 242 free(list->value); 243 free(list); 244 list = tmp; 245 } 246 } 247