Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2011 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #define LOG_TAG "str_params" |
| 18 | //#define LOG_NDEBUG 0 |
| 19 | |
| 20 | #define _GNU_SOURCE 1 |
| 21 | #include <errno.h> |
| 22 | #include <stdint.h> |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | |
| 27 | #include <cutils/hashmap.h> |
| 28 | #include <cutils/log.h> |
| 29 | #include <cutils/memory.h> |
| 30 | |
| 31 | #include <cutils/str_parms.h> |
| 32 | |
| 33 | struct str_parms { |
| 34 | Hashmap *map; |
| 35 | }; |
| 36 | |
| 37 | |
| 38 | static bool str_eq(void *key_a, void *key_b) |
| 39 | { |
| 40 | return !strcmp((const char *)key_a, (const char *)key_b); |
| 41 | } |
| 42 | |
| 43 | /* use djb hash unless we find it inadequate */ |
| 44 | static int str_hash_fn(void *str) |
| 45 | { |
| 46 | uint32_t hash = 5381; |
| 47 | char *p; |
| 48 | |
| 49 | for (p = str; p && *p; p++) |
| 50 | hash = ((hash << 5) + hash) + *p; |
| 51 | return (int)hash; |
| 52 | } |
| 53 | |
| 54 | struct str_parms *str_parms_create(void) |
| 55 | { |
| 56 | struct str_parms *str_parms; |
| 57 | |
| 58 | str_parms = calloc(1, sizeof(struct str_parms)); |
| 59 | if (!str_parms) |
| 60 | return NULL; |
| 61 | |
| 62 | str_parms->map = hashmapCreate(5, str_hash_fn, str_eq); |
| 63 | if (!str_parms->map) |
| 64 | goto err; |
| 65 | |
| 66 | return str_parms; |
| 67 | |
| 68 | err: |
| 69 | free(str_parms); |
| 70 | return NULL; |
| 71 | } |
| 72 | |
| 73 | static bool remove_pair(void *key, void *value, void *context) |
| 74 | { |
| 75 | struct str_parms *str_parms = context; |
| 76 | |
| 77 | hashmapRemove(str_parms->map, key); |
| 78 | free(key); |
| 79 | free(value); |
| 80 | return true; |
| 81 | } |
| 82 | |
| 83 | void str_parms_destroy(struct str_parms *str_parms) |
| 84 | { |
| 85 | hashmapForEach(str_parms->map, remove_pair, str_parms); |
| 86 | hashmapFree(str_parms->map); |
| 87 | free(str_parms); |
| 88 | } |
| 89 | |
| 90 | struct str_parms *str_parms_create_str(const char *_string) |
| 91 | { |
| 92 | struct str_parms *str_parms; |
| 93 | char *str; |
| 94 | char *kvpair; |
| 95 | char *tmpstr; |
| 96 | int items = 0; |
| 97 | |
| 98 | str_parms = str_parms_create(); |
| 99 | if (!str_parms) |
| 100 | goto err_create_str_parms; |
| 101 | |
| 102 | str = strdup(_string); |
| 103 | if (!str) |
| 104 | goto err_strdup; |
| 105 | |
Steve Block | 69f4cd7 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 106 | ALOGV("%s: source string == '%s'\n", __func__, _string); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 107 | |
| 108 | kvpair = strtok_r(str, ";", &tmpstr); |
| 109 | while (kvpair && *kvpair) { |
| 110 | char *eq = strchr(kvpair, '='); /* would love strchrnul */ |
| 111 | char *value; |
| 112 | char *key; |
| 113 | void *old_val; |
| 114 | |
| 115 | if (eq == kvpair) |
| 116 | goto next_pair; |
| 117 | |
| 118 | if (eq) { |
| 119 | key = strndup(kvpair, eq - kvpair); |
| 120 | if (*(++eq)) |
| 121 | value = strdup(eq); |
| 122 | else |
| 123 | value = strdup(""); |
| 124 | } else { |
| 125 | key = strdup(kvpair); |
| 126 | value = strdup(""); |
| 127 | } |
| 128 | |
| 129 | /* if we replaced a value, free it */ |
| 130 | old_val = hashmapPut(str_parms->map, key, value); |
Dima Zavin | 86bfbe3 | 2012-03-14 23:10:06 -0700 | [diff] [blame^] | 131 | if (old_val) { |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 132 | free(old_val); |
Dima Zavin | 86bfbe3 | 2012-03-14 23:10:06 -0700 | [diff] [blame^] | 133 | free(key); |
| 134 | } |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 135 | |
| 136 | items++; |
| 137 | next_pair: |
| 138 | kvpair = strtok_r(NULL, ";", &tmpstr); |
| 139 | } |
| 140 | |
| 141 | if (!items) |
Steve Block | 69f4cd7 | 2011-10-20 11:54:09 +0100 | [diff] [blame] | 142 | ALOGV("%s: no items found in string\n", __func__); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 143 | |
| 144 | free(str); |
| 145 | |
| 146 | return str_parms; |
| 147 | |
| 148 | err_strdup: |
| 149 | str_parms_destroy(str_parms); |
| 150 | err_create_str_parms: |
| 151 | return NULL; |
| 152 | } |
| 153 | |
| 154 | void str_parms_del(struct str_parms *str_parms, const char *key) |
| 155 | { |
| 156 | hashmapRemove(str_parms->map, (void *)key); |
| 157 | } |
| 158 | |
| 159 | int str_parms_add_str(struct str_parms *str_parms, const char *key, |
| 160 | const char *value) |
| 161 | { |
| 162 | void *old_val; |
Dima Zavin | 70b9303 | 2012-03-12 11:01:16 -0700 | [diff] [blame] | 163 | void *tmp_key; |
| 164 | void *tmp_val; |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 165 | |
Dima Zavin | 70b9303 | 2012-03-12 11:01:16 -0700 | [diff] [blame] | 166 | tmp_key = strdup(key); |
| 167 | tmp_val = strdup(value); |
| 168 | old_val = hashmapPut(str_parms->map, tmp_key, tmp_val); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 169 | |
| 170 | if (old_val) { |
| 171 | free(old_val); |
Dima Zavin | 86bfbe3 | 2012-03-14 23:10:06 -0700 | [diff] [blame^] | 172 | free(tmp_key); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 173 | } else if (errno == ENOMEM) { |
Dima Zavin | 70b9303 | 2012-03-12 11:01:16 -0700 | [diff] [blame] | 174 | free(tmp_key); |
| 175 | free(tmp_val); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 176 | return -ENOMEM; |
| 177 | } |
| 178 | return 0; |
| 179 | } |
| 180 | |
| 181 | int str_parms_add_int(struct str_parms *str_parms, const char *key, int value) |
| 182 | { |
| 183 | char val_str[12]; |
| 184 | int ret; |
| 185 | |
| 186 | ret = snprintf(val_str, sizeof(val_str), "%d", value); |
| 187 | if (ret < 0) |
| 188 | return -EINVAL; |
| 189 | |
| 190 | ret = str_parms_add_str(str_parms, key, val_str); |
| 191 | return ret; |
| 192 | } |
| 193 | |
| 194 | int str_parms_add_float(struct str_parms *str_parms, const char *key, |
| 195 | float value) |
| 196 | { |
| 197 | char val_str[23]; |
| 198 | int ret; |
| 199 | |
| 200 | ret = snprintf(val_str, sizeof(val_str), "%.10f", value); |
| 201 | if (ret < 0) |
| 202 | return -EINVAL; |
| 203 | |
| 204 | ret = str_parms_add_str(str_parms, key, val_str); |
| 205 | return ret; |
| 206 | } |
| 207 | |
| 208 | int str_parms_get_str(struct str_parms *str_parms, const char *key, char *val, |
| 209 | int len) |
| 210 | { |
| 211 | char *value; |
| 212 | |
| 213 | value = hashmapGet(str_parms->map, (void *)key); |
| 214 | if (value) |
| 215 | return strlcpy(val, value, len); |
| 216 | |
| 217 | return -ENOENT; |
| 218 | } |
| 219 | |
| 220 | int str_parms_get_int(struct str_parms *str_parms, const char *key, int *val) |
| 221 | { |
| 222 | char *value; |
| 223 | char *end; |
| 224 | |
| 225 | value = hashmapGet(str_parms->map, (void *)key); |
| 226 | if (!value) |
| 227 | return -ENOENT; |
| 228 | |
| 229 | *val = (int)strtol(value, &end, 0); |
| 230 | if (*value != '\0' && *end == '\0') |
| 231 | return 0; |
| 232 | |
| 233 | return -EINVAL; |
| 234 | } |
| 235 | |
| 236 | int str_parms_get_float(struct str_parms *str_parms, const char *key, |
| 237 | float *val) |
| 238 | { |
| 239 | float out; |
| 240 | char *value; |
| 241 | char *end; |
| 242 | |
| 243 | value = hashmapGet(str_parms->map, (void *)key); |
| 244 | if (!value) |
| 245 | return -ENOENT; |
| 246 | |
| 247 | out = strtof(value, &end); |
| 248 | if (*value != '\0' && *end == '\0') |
| 249 | return 0; |
| 250 | |
| 251 | return -EINVAL; |
| 252 | } |
| 253 | |
| 254 | static bool combine_strings(void *key, void *value, void *context) |
| 255 | { |
| 256 | char **old_str = context; |
| 257 | char *new_str; |
| 258 | int ret; |
| 259 | |
| 260 | ret = asprintf(&new_str, "%s%s%s=%s", |
| 261 | *old_str ? *old_str : "", |
| 262 | *old_str ? ";" : "", |
| 263 | (char *)key, |
| 264 | (char *)value); |
| 265 | if (*old_str) |
| 266 | free(*old_str); |
| 267 | |
| 268 | if (ret >= 0) { |
| 269 | *old_str = new_str; |
| 270 | return true; |
| 271 | } |
| 272 | |
| 273 | *old_str = NULL; |
| 274 | return false; |
| 275 | } |
| 276 | |
| 277 | char *str_parms_to_str(struct str_parms *str_parms) |
| 278 | { |
| 279 | char *str = NULL; |
| 280 | |
| 281 | if (hashmapSize(str_parms->map) > 0) |
| 282 | hashmapForEach(str_parms->map, combine_strings, &str); |
| 283 | else |
| 284 | str = strdup(""); |
| 285 | return str; |
| 286 | } |
| 287 | |
| 288 | static bool dump_entry(void *key, void *value, void *context) |
| 289 | { |
Steve Block | fe71a61 | 2012-01-04 19:19:03 +0000 | [diff] [blame] | 290 | ALOGI("key: '%s' value: '%s'\n", (char *)key, (char *)value); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 291 | return true; |
| 292 | } |
| 293 | |
| 294 | void str_parms_dump(struct str_parms *str_parms) |
| 295 | { |
| 296 | hashmapForEach(str_parms->map, dump_entry, str_parms); |
| 297 | } |
| 298 | |
| 299 | #ifdef TEST_STR_PARMS |
| 300 | static void test_str_parms_str(const char *str) |
| 301 | { |
| 302 | struct str_parms *str_parms; |
| 303 | char *out_str; |
| 304 | int ret; |
| 305 | |
| 306 | str_parms = str_parms_create_str(str); |
Dima Zavin | a603e40 | 2012-03-12 11:02:00 -0700 | [diff] [blame] | 307 | str_parms_add_str(str_parms, "dude", "woah"); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 308 | str_parms_dump(str_parms); |
| 309 | out_str = str_parms_to_str(str_parms); |
| 310 | str_parms_destroy(str_parms); |
Steve Block | fe71a61 | 2012-01-04 19:19:03 +0000 | [diff] [blame] | 311 | ALOGI("%s: '%s' stringified is '%s'", __func__, str, out_str); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 312 | free(out_str); |
| 313 | } |
| 314 | |
| 315 | int main(void) |
| 316 | { |
| 317 | struct str_parms *str_parms; |
| 318 | |
| 319 | test_str_parms_str(""); |
| 320 | test_str_parms_str(";"); |
| 321 | test_str_parms_str("="); |
| 322 | test_str_parms_str("=;"); |
| 323 | test_str_parms_str("=bar"); |
| 324 | test_str_parms_str("=bar;"); |
| 325 | test_str_parms_str("foo="); |
| 326 | test_str_parms_str("foo=;"); |
| 327 | test_str_parms_str("foo=bar"); |
| 328 | test_str_parms_str("foo=bar;"); |
| 329 | test_str_parms_str("foo=bar;baz"); |
| 330 | test_str_parms_str("foo=bar;baz="); |
| 331 | test_str_parms_str("foo=bar;baz=bat"); |
| 332 | test_str_parms_str("foo=bar;baz=bat;"); |
Dima Zavin | 86bfbe3 | 2012-03-14 23:10:06 -0700 | [diff] [blame^] | 333 | test_str_parms_str("foo=bar;baz=bat;foo=bar"); |
Dima Zavin | 0fad7d0 | 2011-03-24 11:11:06 -0700 | [diff] [blame] | 334 | |
| 335 | return 0; |
| 336 | } |
| 337 | #endif |