Laszlo Nagy | bc68758 | 2016-01-12 22:38:41 +0000 | [diff] [blame] | 1 | /* -*- coding: utf-8 -*- |
| 2 | // The LLVM Compiler Infrastructure |
| 3 | // |
| 4 | // This file is distributed under the University of Illinois Open Source |
| 5 | // License. See LICENSE.TXT for details. |
| 6 | */ |
| 7 | |
| 8 | /** |
| 9 | * This file implements a shared library. This library can be pre-loaded by |
| 10 | * the dynamic linker of the Operating System (OS). It implements a few function |
| 11 | * related to process creation. By pre-load this library the executed process |
| 12 | * uses these functions instead of those from the standard library. |
| 13 | * |
| 14 | * The idea here is to inject a logic before call the real methods. The logic is |
| 15 | * to dump the call into a file. To call the real method this library is doing |
| 16 | * the job of the dynamic linker. |
| 17 | * |
| 18 | * The only input for the log writing is about the destination directory. |
| 19 | * This is passed as environment variable. |
| 20 | */ |
| 21 | |
| 22 | #include "config.h" |
| 23 | |
| 24 | #include <stddef.h> |
| 25 | #include <stdarg.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <stdio.h> |
| 28 | #include <string.h> |
| 29 | #include <unistd.h> |
| 30 | #include <dlfcn.h> |
| 31 | #include <pthread.h> |
| 32 | |
| 33 | #if defined HAVE_POSIX_SPAWN || defined HAVE_POSIX_SPAWNP |
| 34 | #include <spawn.h> |
| 35 | #endif |
| 36 | |
| 37 | #if defined HAVE_NSGETENVIRON |
| 38 | # include <crt_externs.h> |
| 39 | #else |
| 40 | extern char **environ; |
| 41 | #endif |
| 42 | |
| 43 | #define ENV_OUTPUT "INTERCEPT_BUILD_TARGET_DIR" |
| 44 | #ifdef APPLE |
| 45 | # define ENV_FLAT "DYLD_FORCE_FLAT_NAMESPACE" |
| 46 | # define ENV_PRELOAD "DYLD_INSERT_LIBRARIES" |
| 47 | # define ENV_SIZE 3 |
| 48 | #else |
| 49 | # define ENV_PRELOAD "LD_PRELOAD" |
| 50 | # define ENV_SIZE 2 |
| 51 | #endif |
| 52 | |
| 53 | #define DLSYM(TYPE_, VAR_, SYMBOL_) \ |
| 54 | union { \ |
| 55 | void *from; \ |
| 56 | TYPE_ to; \ |
| 57 | } cast; \ |
| 58 | if (0 == (cast.from = dlsym(RTLD_NEXT, SYMBOL_))) { \ |
| 59 | perror("bear: dlsym"); \ |
| 60 | exit(EXIT_FAILURE); \ |
| 61 | } \ |
| 62 | TYPE_ const VAR_ = cast.to; |
| 63 | |
| 64 | |
| 65 | typedef char const * bear_env_t[ENV_SIZE]; |
| 66 | |
| 67 | static int bear_capture_env_t(bear_env_t *env); |
| 68 | static int bear_reset_env_t(bear_env_t *env); |
| 69 | static void bear_release_env_t(bear_env_t *env); |
| 70 | static char const **bear_update_environment(char *const envp[], bear_env_t *env); |
| 71 | static char const **bear_update_environ(char const **in, char const *key, char const *value); |
| 72 | static char **bear_get_environment(); |
| 73 | static void bear_report_call(char const *fun, char const *const argv[]); |
| 74 | static char const **bear_strings_build(char const *arg, va_list *ap); |
| 75 | static char const **bear_strings_copy(char const **const in); |
| 76 | static char const **bear_strings_append(char const **in, char const *e); |
| 77 | static size_t bear_strings_length(char const *const *in); |
| 78 | static void bear_strings_release(char const **); |
| 79 | |
| 80 | |
| 81 | static bear_env_t env_names = |
| 82 | { ENV_OUTPUT |
| 83 | , ENV_PRELOAD |
| 84 | #ifdef ENV_FLAT |
| 85 | , ENV_FLAT |
| 86 | #endif |
| 87 | }; |
| 88 | |
| 89 | static bear_env_t initial_env = |
| 90 | { 0 |
| 91 | , 0 |
| 92 | #ifdef ENV_FLAT |
| 93 | , 0 |
| 94 | #endif |
| 95 | }; |
| 96 | |
| 97 | static int initialized = 0; |
| 98 | static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; |
| 99 | |
| 100 | static void on_load(void) __attribute__((constructor)); |
| 101 | static void on_unload(void) __attribute__((destructor)); |
| 102 | |
| 103 | |
| 104 | #ifdef HAVE_EXECVE |
| 105 | static int call_execve(const char *path, char *const argv[], |
| 106 | char *const envp[]); |
| 107 | #endif |
| 108 | #ifdef HAVE_EXECVP |
| 109 | static int call_execvp(const char *file, char *const argv[]); |
| 110 | #endif |
| 111 | #ifdef HAVE_EXECVPE |
| 112 | static int call_execvpe(const char *file, char *const argv[], |
| 113 | char *const envp[]); |
| 114 | #endif |
| 115 | #ifdef HAVE_EXECVP2 |
| 116 | static int call_execvP(const char *file, const char *search_path, |
| 117 | char *const argv[]); |
| 118 | #endif |
| 119 | #ifdef HAVE_EXECT |
| 120 | static int call_exect(const char *path, char *const argv[], |
| 121 | char *const envp[]); |
| 122 | #endif |
| 123 | #ifdef HAVE_POSIX_SPAWN |
| 124 | static int call_posix_spawn(pid_t *restrict pid, const char *restrict path, |
| 125 | const posix_spawn_file_actions_t *file_actions, |
| 126 | const posix_spawnattr_t *restrict attrp, |
| 127 | char *const argv[restrict], |
| 128 | char *const envp[restrict]); |
| 129 | #endif |
| 130 | #ifdef HAVE_POSIX_SPAWNP |
| 131 | static int call_posix_spawnp(pid_t *restrict pid, const char *restrict file, |
| 132 | const posix_spawn_file_actions_t *file_actions, |
| 133 | const posix_spawnattr_t *restrict attrp, |
| 134 | char *const argv[restrict], |
| 135 | char *const envp[restrict]); |
| 136 | #endif |
| 137 | |
| 138 | |
| 139 | /* Initialization method to Captures the relevant environment variables. |
| 140 | */ |
| 141 | |
| 142 | static void on_load(void) { |
| 143 | pthread_mutex_lock(&mutex); |
| 144 | if (!initialized) |
| 145 | initialized = bear_capture_env_t(&initial_env); |
| 146 | pthread_mutex_unlock(&mutex); |
| 147 | } |
| 148 | |
| 149 | static void on_unload(void) { |
| 150 | pthread_mutex_lock(&mutex); |
| 151 | bear_release_env_t(&initial_env); |
| 152 | initialized = 0; |
| 153 | pthread_mutex_unlock(&mutex); |
| 154 | } |
| 155 | |
| 156 | |
| 157 | /* These are the methods we are try to hijack. |
| 158 | */ |
| 159 | |
| 160 | #ifdef HAVE_EXECVE |
| 161 | int execve(const char *path, char *const argv[], char *const envp[]) { |
| 162 | bear_report_call(__func__, (char const *const *)argv); |
| 163 | return call_execve(path, argv, envp); |
| 164 | } |
| 165 | #endif |
| 166 | |
| 167 | #ifdef HAVE_EXECV |
| 168 | #ifndef HAVE_EXECVE |
| 169 | #error can not implement execv without execve |
| 170 | #endif |
| 171 | int execv(const char *path, char *const argv[]) { |
| 172 | bear_report_call(__func__, (char const *const *)argv); |
| 173 | char * const * envp = bear_get_environment(); |
| 174 | return call_execve(path, argv, envp); |
| 175 | } |
| 176 | #endif |
| 177 | |
| 178 | #ifdef HAVE_EXECVPE |
| 179 | int execvpe(const char *file, char *const argv[], char *const envp[]) { |
| 180 | bear_report_call(__func__, (char const *const *)argv); |
| 181 | return call_execvpe(file, argv, envp); |
| 182 | } |
| 183 | #endif |
| 184 | |
| 185 | #ifdef HAVE_EXECVP |
| 186 | int execvp(const char *file, char *const argv[]) { |
| 187 | bear_report_call(__func__, (char const *const *)argv); |
| 188 | return call_execvp(file, argv); |
| 189 | } |
| 190 | #endif |
| 191 | |
| 192 | #ifdef HAVE_EXECVP2 |
| 193 | int execvP(const char *file, const char *search_path, char *const argv[]) { |
| 194 | bear_report_call(__func__, (char const *const *)argv); |
| 195 | return call_execvP(file, search_path, argv); |
| 196 | } |
| 197 | #endif |
| 198 | |
| 199 | #ifdef HAVE_EXECT |
| 200 | int exect(const char *path, char *const argv[], char *const envp[]) { |
| 201 | bear_report_call(__func__, (char const *const *)argv); |
| 202 | return call_exect(path, argv, envp); |
| 203 | } |
| 204 | #endif |
| 205 | |
| 206 | #ifdef HAVE_EXECL |
| 207 | # ifndef HAVE_EXECVE |
| 208 | # error can not implement execl without execve |
| 209 | # endif |
| 210 | int execl(const char *path, const char *arg, ...) { |
| 211 | va_list args; |
| 212 | va_start(args, arg); |
| 213 | char const **argv = bear_strings_build(arg, &args); |
| 214 | va_end(args); |
| 215 | |
| 216 | bear_report_call(__func__, (char const *const *)argv); |
| 217 | char * const * envp = bear_get_environment(); |
| 218 | int const result = call_execve(path, (char *const *)argv, envp); |
| 219 | |
| 220 | bear_strings_release(argv); |
| 221 | return result; |
| 222 | } |
| 223 | #endif |
| 224 | |
| 225 | #ifdef HAVE_EXECLP |
| 226 | # ifndef HAVE_EXECVP |
| 227 | # error can not implement execlp without execvp |
| 228 | # endif |
| 229 | int execlp(const char *file, const char *arg, ...) { |
| 230 | va_list args; |
| 231 | va_start(args, arg); |
| 232 | char const **argv = bear_strings_build(arg, &args); |
| 233 | va_end(args); |
| 234 | |
| 235 | bear_report_call(__func__, (char const *const *)argv); |
| 236 | int const result = call_execvp(file, (char *const *)argv); |
| 237 | |
| 238 | bear_strings_release(argv); |
| 239 | return result; |
| 240 | } |
| 241 | #endif |
| 242 | |
| 243 | #ifdef HAVE_EXECLE |
| 244 | # ifndef HAVE_EXECVE |
| 245 | # error can not implement execle without execve |
| 246 | # endif |
| 247 | // int execle(const char *path, const char *arg, ..., char * const envp[]); |
| 248 | int execle(const char *path, const char *arg, ...) { |
| 249 | va_list args; |
| 250 | va_start(args, arg); |
| 251 | char const **argv = bear_strings_build(arg, &args); |
| 252 | char const **envp = va_arg(args, char const **); |
| 253 | va_end(args); |
| 254 | |
| 255 | bear_report_call(__func__, (char const *const *)argv); |
| 256 | int const result = |
| 257 | call_execve(path, (char *const *)argv, (char *const *)envp); |
| 258 | |
| 259 | bear_strings_release(argv); |
| 260 | return result; |
| 261 | } |
| 262 | #endif |
| 263 | |
| 264 | #ifdef HAVE_POSIX_SPAWN |
| 265 | int posix_spawn(pid_t *restrict pid, const char *restrict path, |
| 266 | const posix_spawn_file_actions_t *file_actions, |
| 267 | const posix_spawnattr_t *restrict attrp, |
| 268 | char *const argv[restrict], char *const envp[restrict]) { |
| 269 | bear_report_call(__func__, (char const *const *)argv); |
| 270 | return call_posix_spawn(pid, path, file_actions, attrp, argv, envp); |
| 271 | } |
| 272 | #endif |
| 273 | |
| 274 | #ifdef HAVE_POSIX_SPAWNP |
| 275 | int posix_spawnp(pid_t *restrict pid, const char *restrict file, |
| 276 | const posix_spawn_file_actions_t *file_actions, |
| 277 | const posix_spawnattr_t *restrict attrp, |
| 278 | char *const argv[restrict], char *const envp[restrict]) { |
| 279 | bear_report_call(__func__, (char const *const *)argv); |
| 280 | return call_posix_spawnp(pid, file, file_actions, attrp, argv, envp); |
| 281 | } |
| 282 | #endif |
| 283 | |
| 284 | /* These are the methods which forward the call to the standard implementation. |
| 285 | */ |
| 286 | |
| 287 | #ifdef HAVE_EXECVE |
| 288 | static int call_execve(const char *path, char *const argv[], |
| 289 | char *const envp[]) { |
| 290 | typedef int (*func)(const char *, char *const *, char *const *); |
| 291 | |
| 292 | DLSYM(func, fp, "execve"); |
| 293 | |
| 294 | char const **const menvp = bear_update_environment(envp, &initial_env); |
| 295 | int const result = (*fp)(path, argv, (char *const *)menvp); |
| 296 | bear_strings_release(menvp); |
| 297 | return result; |
| 298 | } |
| 299 | #endif |
| 300 | |
| 301 | #ifdef HAVE_EXECVPE |
| 302 | static int call_execvpe(const char *file, char *const argv[], |
| 303 | char *const envp[]) { |
| 304 | typedef int (*func)(const char *, char *const *, char *const *); |
| 305 | |
| 306 | DLSYM(func, fp, "execvpe"); |
| 307 | |
| 308 | char const **const menvp = bear_update_environment(envp, &initial_env); |
| 309 | int const result = (*fp)(file, argv, (char *const *)menvp); |
| 310 | bear_strings_release(menvp); |
| 311 | return result; |
| 312 | } |
| 313 | #endif |
| 314 | |
| 315 | #ifdef HAVE_EXECVP |
| 316 | static int call_execvp(const char *file, char *const argv[]) { |
| 317 | typedef int (*func)(const char *file, char *const argv[]); |
| 318 | |
| 319 | DLSYM(func, fp, "execvp"); |
| 320 | |
| 321 | bear_env_t current_env; |
| 322 | bear_capture_env_t(¤t_env); |
| 323 | bear_reset_env_t(&initial_env); |
| 324 | int const result = (*fp)(file, argv); |
| 325 | bear_reset_env_t(¤t_env); |
| 326 | bear_release_env_t(¤t_env); |
| 327 | |
| 328 | return result; |
| 329 | } |
| 330 | #endif |
| 331 | |
| 332 | #ifdef HAVE_EXECVP2 |
| 333 | static int call_execvP(const char *file, const char *search_path, |
| 334 | char *const argv[]) { |
| 335 | typedef int (*func)(const char *, const char *, char *const *); |
| 336 | |
| 337 | DLSYM(func, fp, "execvP"); |
| 338 | |
| 339 | bear_env_t current_env; |
| 340 | bear_capture_env_t(¤t_env); |
| 341 | bear_reset_env_t(&initial_env); |
| 342 | int const result = (*fp)(file, search_path, argv); |
| 343 | bear_reset_env_t(¤t_env); |
| 344 | bear_release_env_t(¤t_env); |
| 345 | |
| 346 | return result; |
| 347 | } |
| 348 | #endif |
| 349 | |
| 350 | #ifdef HAVE_EXECT |
| 351 | static int call_exect(const char *path, char *const argv[], |
| 352 | char *const envp[]) { |
| 353 | typedef int (*func)(const char *, char *const *, char *const *); |
| 354 | |
| 355 | DLSYM(func, fp, "exect"); |
| 356 | |
| 357 | char const **const menvp = bear_update_environment(envp, &initial_env); |
| 358 | int const result = (*fp)(path, argv, (char *const *)menvp); |
| 359 | bear_strings_release(menvp); |
| 360 | return result; |
| 361 | } |
| 362 | #endif |
| 363 | |
| 364 | #ifdef HAVE_POSIX_SPAWN |
| 365 | static int call_posix_spawn(pid_t *restrict pid, const char *restrict path, |
| 366 | const posix_spawn_file_actions_t *file_actions, |
| 367 | const posix_spawnattr_t *restrict attrp, |
| 368 | char *const argv[restrict], |
| 369 | char *const envp[restrict]) { |
| 370 | typedef int (*func)(pid_t *restrict, const char *restrict, |
| 371 | const posix_spawn_file_actions_t *, |
| 372 | const posix_spawnattr_t *restrict, |
| 373 | char *const *restrict, char *const *restrict); |
| 374 | |
| 375 | DLSYM(func, fp, "posix_spawn"); |
| 376 | |
| 377 | char const **const menvp = bear_update_environment(envp, &initial_env); |
| 378 | int const result = |
| 379 | (*fp)(pid, path, file_actions, attrp, argv, (char *const *restrict)menvp); |
| 380 | bear_strings_release(menvp); |
| 381 | return result; |
| 382 | } |
| 383 | #endif |
| 384 | |
| 385 | #ifdef HAVE_POSIX_SPAWNP |
| 386 | static int call_posix_spawnp(pid_t *restrict pid, const char *restrict file, |
| 387 | const posix_spawn_file_actions_t *file_actions, |
| 388 | const posix_spawnattr_t *restrict attrp, |
| 389 | char *const argv[restrict], |
| 390 | char *const envp[restrict]) { |
| 391 | typedef int (*func)(pid_t *restrict, const char *restrict, |
| 392 | const posix_spawn_file_actions_t *, |
| 393 | const posix_spawnattr_t *restrict, |
| 394 | char *const *restrict, char *const *restrict); |
| 395 | |
| 396 | DLSYM(func, fp, "posix_spawnp"); |
| 397 | |
| 398 | char const **const menvp = bear_update_environment(envp, &initial_env); |
| 399 | int const result = |
| 400 | (*fp)(pid, file, file_actions, attrp, argv, (char *const *restrict)menvp); |
| 401 | bear_strings_release(menvp); |
| 402 | return result; |
| 403 | } |
| 404 | #endif |
| 405 | |
| 406 | /* this method is to write log about the process creation. */ |
| 407 | |
| 408 | static void bear_report_call(char const *fun, char const *const argv[]) { |
| 409 | static int const GS = 0x1d; |
| 410 | static int const RS = 0x1e; |
| 411 | static int const US = 0x1f; |
| 412 | |
| 413 | if (!initialized) |
| 414 | return; |
| 415 | |
| 416 | pthread_mutex_lock(&mutex); |
| 417 | const char *cwd = getcwd(NULL, 0); |
| 418 | if (0 == cwd) { |
| 419 | perror("bear: getcwd"); |
| 420 | exit(EXIT_FAILURE); |
| 421 | } |
| 422 | char const * const out_dir = initial_env[0]; |
| 423 | size_t const path_max_length = strlen(out_dir) + 32; |
| 424 | char filename[path_max_length]; |
| 425 | if (-1 == snprintf(filename, path_max_length, "%s/%d.cmd", out_dir, getpid())) { |
| 426 | perror("bear: snprintf"); |
| 427 | exit(EXIT_FAILURE); |
| 428 | } |
| 429 | FILE * fd = fopen(filename, "a+"); |
| 430 | if (0 == fd) { |
| 431 | perror("bear: fopen"); |
| 432 | exit(EXIT_FAILURE); |
| 433 | } |
| 434 | fprintf(fd, "%d%c", getpid(), RS); |
| 435 | fprintf(fd, "%d%c", getppid(), RS); |
| 436 | fprintf(fd, "%s%c", fun, RS); |
| 437 | fprintf(fd, "%s%c", cwd, RS); |
| 438 | size_t const argc = bear_strings_length(argv); |
| 439 | for (size_t it = 0; it < argc; ++it) { |
| 440 | fprintf(fd, "%s%c", argv[it], US); |
| 441 | } |
| 442 | fprintf(fd, "%c", GS); |
| 443 | if (fclose(fd)) { |
| 444 | perror("bear: fclose"); |
| 445 | exit(EXIT_FAILURE); |
| 446 | } |
| 447 | free((void *)cwd); |
| 448 | pthread_mutex_unlock(&mutex); |
| 449 | } |
| 450 | |
| 451 | /* update environment assure that chilren processes will copy the desired |
| 452 | * behaviour */ |
| 453 | |
| 454 | static int bear_capture_env_t(bear_env_t *env) { |
| 455 | int status = 1; |
| 456 | for (size_t it = 0; it < ENV_SIZE; ++it) { |
| 457 | char const * const env_value = getenv(env_names[it]); |
| 458 | char const * const env_copy = (env_value) ? strdup(env_value) : env_value; |
| 459 | (*env)[it] = env_copy; |
| 460 | status &= (env_copy) ? 1 : 0; |
| 461 | } |
| 462 | return status; |
| 463 | } |
| 464 | |
| 465 | static int bear_reset_env_t(bear_env_t *env) { |
| 466 | int status = 1; |
| 467 | for (size_t it = 0; it < ENV_SIZE; ++it) { |
| 468 | if ((*env)[it]) { |
| 469 | setenv(env_names[it], (*env)[it], 1); |
| 470 | } else { |
| 471 | unsetenv(env_names[it]); |
| 472 | } |
| 473 | } |
| 474 | return status; |
| 475 | } |
| 476 | |
| 477 | static void bear_release_env_t(bear_env_t *env) { |
| 478 | for (size_t it = 0; it < ENV_SIZE; ++it) { |
| 479 | free((void *)(*env)[it]); |
| 480 | (*env)[it] = 0; |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | static char const **bear_update_environment(char *const envp[], bear_env_t *env) { |
| 485 | char const **result = bear_strings_copy((char const **)envp); |
| 486 | for (size_t it = 0; it < ENV_SIZE && (*env)[it]; ++it) |
| 487 | result = bear_update_environ(result, env_names[it], (*env)[it]); |
| 488 | return result; |
| 489 | } |
| 490 | |
| 491 | static char const **bear_update_environ(char const *envs[], char const *key, char const * const value) { |
| 492 | // find the key if it's there |
| 493 | size_t const key_length = strlen(key); |
| 494 | char const **it = envs; |
| 495 | for (; (it) && (*it); ++it) { |
| 496 | if ((0 == strncmp(*it, key, key_length)) && |
| 497 | (strlen(*it) > key_length) && ('=' == (*it)[key_length])) |
| 498 | break; |
| 499 | } |
| 500 | // allocate a environment entry |
| 501 | size_t const value_length = strlen(value); |
| 502 | size_t const env_length = key_length + value_length + 2; |
| 503 | char *env = malloc(env_length); |
| 504 | if (0 == env) { |
| 505 | perror("bear: malloc [in env_update]"); |
| 506 | exit(EXIT_FAILURE); |
| 507 | } |
| 508 | if (-1 == snprintf(env, env_length, "%s=%s", key, value)) { |
| 509 | perror("bear: snprintf"); |
| 510 | exit(EXIT_FAILURE); |
| 511 | } |
| 512 | // replace or append the environment entry |
| 513 | if (it && *it) { |
| 514 | free((void *)*it); |
| 515 | *it = env; |
| 516 | return envs; |
| 517 | } |
| 518 | return bear_strings_append(envs, env); |
| 519 | } |
| 520 | |
| 521 | static char **bear_get_environment() { |
| 522 | #if defined HAVE_NSGETENVIRON |
| 523 | return *_NSGetEnviron(); |
| 524 | #else |
| 525 | return environ; |
| 526 | #endif |
| 527 | } |
| 528 | |
| 529 | /* util methods to deal with string arrays. environment and process arguments |
| 530 | * are both represented as string arrays. */ |
| 531 | |
| 532 | static char const **bear_strings_build(char const *const arg, va_list *args) { |
| 533 | char const **result = 0; |
| 534 | size_t size = 0; |
| 535 | for (char const *it = arg; it; it = va_arg(*args, char const *)) { |
| 536 | result = realloc(result, (size + 1) * sizeof(char const *)); |
| 537 | if (0 == result) { |
| 538 | perror("bear: realloc"); |
| 539 | exit(EXIT_FAILURE); |
| 540 | } |
| 541 | char const *copy = strdup(it); |
| 542 | if (0 == copy) { |
| 543 | perror("bear: strdup"); |
| 544 | exit(EXIT_FAILURE); |
| 545 | } |
| 546 | result[size++] = copy; |
| 547 | } |
| 548 | result = realloc(result, (size + 1) * sizeof(char const *)); |
| 549 | if (0 == result) { |
| 550 | perror("bear: realloc"); |
| 551 | exit(EXIT_FAILURE); |
| 552 | } |
| 553 | result[size++] = 0; |
| 554 | |
| 555 | return result; |
| 556 | } |
| 557 | |
| 558 | static char const **bear_strings_copy(char const **const in) { |
| 559 | size_t const size = bear_strings_length(in); |
| 560 | |
| 561 | char const **const result = malloc((size + 1) * sizeof(char const *)); |
| 562 | if (0 == result) { |
| 563 | perror("bear: malloc"); |
| 564 | exit(EXIT_FAILURE); |
| 565 | } |
| 566 | |
| 567 | char const **out_it = result; |
| 568 | for (char const *const *in_it = in; (in_it) && (*in_it); |
| 569 | ++in_it, ++out_it) { |
| 570 | *out_it = strdup(*in_it); |
| 571 | if (0 == *out_it) { |
| 572 | perror("bear: strdup"); |
| 573 | exit(EXIT_FAILURE); |
| 574 | } |
| 575 | } |
| 576 | *out_it = 0; |
| 577 | return result; |
| 578 | } |
| 579 | |
| 580 | static char const **bear_strings_append(char const **const in, |
| 581 | char const *const e) { |
| 582 | size_t size = bear_strings_length(in); |
| 583 | char const **result = realloc(in, (size + 2) * sizeof(char const *)); |
| 584 | if (0 == result) { |
| 585 | perror("bear: realloc"); |
| 586 | exit(EXIT_FAILURE); |
| 587 | } |
| 588 | result[size++] = e; |
| 589 | result[size++] = 0; |
| 590 | return result; |
| 591 | } |
| 592 | |
| 593 | static size_t bear_strings_length(char const *const *const in) { |
| 594 | size_t result = 0; |
| 595 | for (char const *const *it = in; (it) && (*it); ++it) |
| 596 | ++result; |
| 597 | return result; |
| 598 | } |
| 599 | |
| 600 | static void bear_strings_release(char const **in) { |
| 601 | for (char const *const *it = in; (it) && (*it); ++it) { |
| 602 | free((void *)*it); |
| 603 | } |
| 604 | free((void *)in); |
| 605 | } |