bigbiff | 7b4c7a6 | 2015-01-01 19:44:14 -0500 | [diff] [blame] | 1 | |
| 2 | #include <ctype.h> |
| 3 | |
| 4 | #include "nls.h" |
| 5 | #include "fdiskP.h" |
| 6 | |
| 7 | /** |
| 8 | * SECTION: parttype |
| 9 | * @title: Partition types |
| 10 | * @short_description: abstraction to partition types |
| 11 | * |
| 12 | * There are two basic types of parttypes, string based (e.g. GPT) |
| 13 | * and code/hex based (e.g. MBR). |
| 14 | */ |
| 15 | |
| 16 | /** |
| 17 | * fdisk_new_parttype: |
| 18 | * |
| 19 | * It's recommended to use fdisk_label_get_parttype_from_code() or |
| 20 | * fdisk_label_get_parttype_from_string() for well known types rather |
| 21 | * than allocate a new instance. |
| 22 | * |
| 23 | * Returns: new instance. |
| 24 | */ |
| 25 | struct fdisk_parttype *fdisk_new_parttype(void) |
| 26 | { |
| 27 | struct fdisk_parttype *t = calloc(1, sizeof(*t)); |
| 28 | |
| 29 | t->refcount = 1; |
| 30 | t->flags = FDISK_PARTTYPE_ALLOCATED; |
| 31 | DBG(PARTTYPE, ul_debugobj(t, "alloc")); |
| 32 | return t; |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * fdisk_ref_parttype: |
| 37 | * @t: partition type |
| 38 | * |
| 39 | * Incremparts reference counter for allocated types |
| 40 | */ |
| 41 | void fdisk_ref_parttype(struct fdisk_parttype *t) |
| 42 | { |
| 43 | if (fdisk_parttype_is_allocated(t)) |
| 44 | t->refcount++; |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * fdisk_unref_parttype |
| 49 | * @t: partition pointer |
| 50 | * |
| 51 | * De-incremparts reference counter, on zero the @t is automatically |
| 52 | * deallocated. |
| 53 | */ |
| 54 | void fdisk_unref_parttype(struct fdisk_parttype *t) |
| 55 | { |
| 56 | if (!fdisk_parttype_is_allocated(t)) |
| 57 | return; |
| 58 | |
| 59 | t->refcount--; |
| 60 | if (t->refcount <= 0) { |
| 61 | DBG(PARTTYPE, ul_debugobj(t, "free")); |
| 62 | free(t->typestr); |
| 63 | free(t->name); |
| 64 | free(t); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * fdisk_parttype_set_name: |
| 70 | * @t: partition type |
| 71 | * @str: type name |
| 72 | * |
| 73 | * Sets type name to allocated partition type, for static types |
| 74 | * it returns -EINVAL. |
| 75 | * |
| 76 | * Return: 0 on success, <0 on error |
| 77 | */ |
| 78 | int fdisk_parttype_set_name(struct fdisk_parttype *t, const char *str) |
| 79 | { |
| 80 | char *p = NULL; |
| 81 | |
| 82 | if (!t || !fdisk_parttype_is_allocated(t)) |
| 83 | return -EINVAL; |
| 84 | if (str) { |
| 85 | p = strdup(str); |
| 86 | if (!p) |
| 87 | return -ENOMEM; |
| 88 | } |
| 89 | |
| 90 | free(t->name); |
| 91 | t->name = p; |
| 92 | return 0; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * fdisk_parttype_set_typestr: |
| 97 | * @t: partition type |
| 98 | * @str: type identificator (e.g. GUID for GPT) |
| 99 | * |
| 100 | * Sets type string to allocated partition type, for static types |
| 101 | * it returns -EINVAL. Don't use this function for MBR, see |
| 102 | * fdisk_parttype_set_code(). |
| 103 | * |
| 104 | * Return: 0 on success, <0 on error |
| 105 | */ |
| 106 | int fdisk_parttype_set_typestr(struct fdisk_parttype *t, const char *str) |
| 107 | { |
| 108 | char *p = NULL; |
| 109 | |
| 110 | if (!t || !fdisk_parttype_is_allocated(t)) |
| 111 | return -EINVAL; |
| 112 | if (str) { |
| 113 | p = strdup(str); |
| 114 | if (!p) |
| 115 | return -ENOMEM; |
| 116 | } |
| 117 | |
| 118 | free(t->typestr); |
| 119 | t->typestr = p; |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * fdisk_parttype_set_code: |
| 125 | * @t: partition type |
| 126 | * @code: type identificator (e.g. MBR type codes) |
| 127 | * |
| 128 | * Sets type code to allocated partition type, for static types it returns |
| 129 | * -EINVAL. Don't use this function for GPT, see fdisk_parttype_set_typestr(). |
| 130 | * |
| 131 | * Return: 0 on success, <0 on error |
| 132 | */ |
| 133 | int fdisk_parttype_set_code(struct fdisk_parttype *t, int code) |
| 134 | { |
| 135 | if (!t || !fdisk_parttype_is_allocated(t)) |
| 136 | return -EINVAL; |
| 137 | t->code = code; |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /** |
| 142 | * fdisk_label_get_nparttypes: |
| 143 | * @lb: label |
| 144 | * |
| 145 | * Returns: number of types supported by label. |
| 146 | */ |
| 147 | size_t fdisk_label_get_nparttypes(const struct fdisk_label *lb) |
| 148 | { |
| 149 | if (!lb) |
| 150 | return 0; |
| 151 | return lb->nparttypes; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * fdisk_label_get_parttype: |
| 156 | * @lb: label |
| 157 | * @n: number |
| 158 | * |
| 159 | * Returns: return parttype |
| 160 | */ |
| 161 | struct fdisk_parttype *fdisk_label_get_parttype(const struct fdisk_label *lb, size_t n) |
| 162 | { |
| 163 | if (!lb || n >= lb->nparttypes) |
| 164 | return NULL; |
| 165 | return &lb->parttypes[n]; |
| 166 | } |
| 167 | |
| 168 | /** |
| 169 | * fdisk_label_has_code_parttypes: |
| 170 | * @lb: label |
| 171 | * |
| 172 | * Returns: 1 if the label uses code as partition type |
| 173 | * identifiers (e.g. MBR) or 0. |
| 174 | */ |
| 175 | int fdisk_label_has_code_parttypes(const struct fdisk_label *lb) |
| 176 | { |
| 177 | assert(lb); |
| 178 | |
| 179 | if (lb->parttypes && lb->parttypes[0].typestr) |
| 180 | return 0; |
| 181 | return 1; |
| 182 | } |
| 183 | |
| 184 | |
| 185 | /** |
| 186 | * fdisk_label_get_parttype_from_code: |
| 187 | * @lb: label |
| 188 | * @code: code to search for |
| 189 | * |
| 190 | * Search for partition type in label-specific table. The result |
| 191 | * is pointer to static array of label types. |
| 192 | * |
| 193 | * Returns: partition type or NULL upon failure or invalid @code. |
| 194 | */ |
| 195 | struct fdisk_parttype *fdisk_label_get_parttype_from_code( |
| 196 | const struct fdisk_label *lb, |
| 197 | unsigned int code) |
| 198 | { |
| 199 | size_t i; |
| 200 | |
| 201 | assert(lb); |
| 202 | |
| 203 | if (!lb->nparttypes) |
| 204 | return NULL; |
| 205 | |
| 206 | for (i = 0; i < lb->nparttypes; i++) |
| 207 | if (lb->parttypes[i].code == code) |
| 208 | return &lb->parttypes[i]; |
| 209 | return NULL; |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * fdisk_label_get_parttype_from_string: |
| 214 | * @lb: label |
| 215 | * @str: string to search for |
| 216 | * |
| 217 | * Search for partition type in label-specific table. The result |
| 218 | * is pointer to static array of label types. |
| 219 | * |
| 220 | * Returns: partition type or NULL upon failure or invalid @str. |
| 221 | */ |
| 222 | struct fdisk_parttype *fdisk_label_get_parttype_from_string( |
| 223 | const struct fdisk_label *lb, |
| 224 | const char *str) |
| 225 | { |
| 226 | size_t i; |
| 227 | |
| 228 | assert(lb); |
| 229 | |
| 230 | if (!lb->nparttypes) |
| 231 | return NULL; |
| 232 | |
| 233 | for (i = 0; i < lb->nparttypes; i++) |
| 234 | if (lb->parttypes[i].typestr |
| 235 | && strcasecmp(lb->parttypes[i].typestr, str) == 0) |
| 236 | return &lb->parttypes[i]; |
| 237 | |
| 238 | return NULL; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * fdisk_new_unknown_parttype: |
| 243 | * @code: type as number |
| 244 | * @typestr: type as string |
| 245 | |
| 246 | * Allocates new 'unknown' partition type. Use fdisk_unref_parttype() to |
| 247 | * deallocate. |
| 248 | * |
| 249 | * Returns: newly allocated partition type, or NULL upon failure. |
| 250 | */ |
| 251 | struct fdisk_parttype *fdisk_new_unknown_parttype(unsigned int code, |
| 252 | const char *typestr) |
| 253 | { |
| 254 | struct fdisk_parttype *t = fdisk_new_parttype(); |
| 255 | |
| 256 | if (!t) |
| 257 | return NULL; |
| 258 | |
| 259 | fdisk_parttype_set_name(t, _("unknown")); |
| 260 | fdisk_parttype_set_code(t, code); |
| 261 | fdisk_parttype_set_typestr(t, typestr); |
| 262 | t->flags |= FDISK_PARTTYPE_UNKNOWN; |
| 263 | |
| 264 | return t; |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * fdisk_copy_parttype: |
| 269 | * @type: type to copy |
| 270 | * |
| 271 | * Use fdisk_unref_parttype() to deallocate. |
| 272 | * |
| 273 | * Returns: newly allocated partition type, or NULL upon failure. |
| 274 | */ |
| 275 | struct fdisk_parttype *fdisk_copy_parttype(const struct fdisk_parttype *type) |
| 276 | { |
| 277 | struct fdisk_parttype *t = fdisk_new_parttype(); |
| 278 | |
| 279 | if (!t) |
| 280 | return NULL; |
| 281 | |
| 282 | fdisk_parttype_set_name(t, type->name); |
| 283 | fdisk_parttype_set_code(t, type->code); |
| 284 | fdisk_parttype_set_typestr(t, type->typestr); |
| 285 | |
| 286 | return t; |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * fdisk_label_parse_parttype: |
| 291 | * @lb: label |
| 292 | * @str: string to parse from |
| 293 | * |
| 294 | * Parses partition type from @str according to the label. Thefunction returns |
| 295 | * a pointer to static table of the partition types, or newly allocated |
| 296 | * partition type for unknown types (see fdisk_parttype_is_unknown(). It's |
| 297 | * safe to call fdisk_unref_parttype() for all results. |
| 298 | * |
| 299 | * Returns: pointer to type or NULL on error. |
| 300 | */ |
| 301 | struct fdisk_parttype *fdisk_label_parse_parttype( |
| 302 | const struct fdisk_label *lb, |
| 303 | const char *str) |
| 304 | { |
| 305 | struct fdisk_parttype *types, *ret; |
| 306 | unsigned int code = 0; |
| 307 | char *typestr = NULL, *end = NULL; |
| 308 | |
| 309 | assert(lb); |
| 310 | |
| 311 | if (!lb->nparttypes) |
| 312 | return NULL; |
| 313 | |
| 314 | DBG(LABEL, ul_debugobj((void *) lb, "parsing '%s' (%s) partition type", |
| 315 | str, lb->name)); |
| 316 | types = lb->parttypes; |
| 317 | |
| 318 | if (types[0].typestr == NULL && isxdigit(*str)) { |
| 319 | |
| 320 | errno = 0; |
| 321 | code = strtol(str, &end, 16); |
| 322 | |
| 323 | if (errno || *end != '\0') { |
| 324 | DBG(LABEL, ul_debugobj((void *) lb, "parsing failed: %m")); |
| 325 | return NULL; |
| 326 | } |
| 327 | ret = fdisk_label_get_parttype_from_code(lb, code); |
| 328 | if (ret) |
| 329 | goto done; |
| 330 | } else { |
| 331 | int i; |
| 332 | |
| 333 | /* maybe specified by type string (e.g. UUID) */ |
| 334 | ret = fdisk_label_get_parttype_from_string(lb, str); |
| 335 | if (ret) |
| 336 | goto done; |
| 337 | |
| 338 | /* maybe specified by order number */ |
| 339 | errno = 0; |
| 340 | i = strtol(str, &end, 0); |
| 341 | if (errno == 0 && *end == '\0' && i > 0 |
| 342 | && i - 1 < (int) lb->nparttypes) { |
| 343 | ret = &types[i - 1]; |
| 344 | goto done; |
| 345 | } |
| 346 | } |
| 347 | |
| 348 | ret = fdisk_new_unknown_parttype(code, typestr); |
| 349 | done: |
| 350 | DBG(PARTTYPE, ul_debugobj(ret, "returns parsed '%s' partition type", ret->name)); |
| 351 | return ret; |
| 352 | } |
| 353 | |
| 354 | /** |
| 355 | * fdisk_parttype_get_string: |
| 356 | * @t: type |
| 357 | * |
| 358 | * Returns: partition type string (e.g. GUID for GPT) |
| 359 | */ |
| 360 | const char *fdisk_parttype_get_string(const struct fdisk_parttype *t) |
| 361 | { |
| 362 | assert(t); |
| 363 | return t->typestr && *t->typestr ? t->typestr : NULL; |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * fdisk_parttype_get_code: |
| 368 | * @t: type |
| 369 | * |
| 370 | * Returns: partition type code (e.g. for MBR) |
| 371 | */ |
| 372 | unsigned int fdisk_parttype_get_code(const struct fdisk_parttype *t) |
| 373 | { |
| 374 | assert(t); |
| 375 | return t->code; |
| 376 | } |
| 377 | |
| 378 | /** |
| 379 | * fdisk_parttype_get_name: |
| 380 | * @t: type |
| 381 | * |
| 382 | * Returns: partition type human readable name |
| 383 | */ |
| 384 | const char *fdisk_parttype_get_name(const struct fdisk_parttype *t) |
| 385 | { |
| 386 | assert(t); |
| 387 | return t->name; |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * fdisk_parttype_is_unknown: |
| 392 | * @t: type |
| 393 | * |
| 394 | * Checks for example result from fdisk_label_parse_parttype(). |
| 395 | * |
| 396 | * Returns: 1 is type is "unknonw" or 0. |
| 397 | */ |
| 398 | int fdisk_parttype_is_unknown(const struct fdisk_parttype *t) |
| 399 | { |
| 400 | return t && (t->flags & FDISK_PARTTYPE_UNKNOWN) ? 1 : 0; |
| 401 | } |