97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
#include <unistd.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <dlfcn.h>
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#define RBUFSZ 4096
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#define WBUFSZ 4096
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static void die_perror(const char *what, const char *path, int exit_code) {
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int saved = errno;
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char msg[512];
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if (path) {
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snprintf(msg, sizeof(msg), "%s: %s: %s\n", what, path, strerror(saved));
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} else {
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snprintf(msg, sizeof(msg), "%s: %s\n", what, strerror(saved));
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}
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(void) write(STDERR_FILENO, msg, strlen(msg));
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_exit(exit_code);
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}
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static long long parse_ll(const char *s) {
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char *end = NULL;
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errno = 0;
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long long v = strtoll(s, &end, 10);
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if (errno != 0 || end == s || *end != '\0' || v < 0) {
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errno = EINVAL;
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return -1;
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}
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return v;
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}
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int main(int argc, char *argv[]) {
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if (argc != 5) {
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const char *usage =
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"Usage: lab2_var12 <input.txt> <output.txt> <max_replacements> <library.so>\n"
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"Variant 12: Load text processing library dynamically and process file.\n"
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"Library should provide 'process_text' function.\n";
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(void) write(STDERR_FILENO, usage, strlen(usage));
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return -1;
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}
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const char *in_path = argv[1];
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const char *out_path = argv[2];
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long long cap = parse_ll(argv[3]);
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const char *lib_path = argv[4];
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if (cap < 0) {
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die_perror("invalid max_replacements", argv[3], -1);
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}
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// Динамически загружаем библиотеку
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void *lib_handle = dlopen(lib_path, RTLD_LAZY);
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if (!lib_handle) {
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const char *error_msg = dlerror();
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char msg[512];
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snprintf(msg, sizeof(msg), "dlopen failed: %s\n", error_msg ? error_msg : "unknown error");
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(void) write(STDERR_FILENO, msg, strlen(msg));
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return -1;
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}
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// Получаем указатель на функцию обработки текста
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long long (*process_text)(const char*, const char*, long long) =
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(long long (*)(const char*, const char*, long long)) dlsym(lib_handle, "process_text");
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if (!process_text) {
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const char *error_msg = dlerror();
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char msg[512];
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snprintf(msg, sizeof(msg), "dlsym failed: %s\n", error_msg ? error_msg : "unknown error");
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(void) write(STDERR_FILENO, msg, strlen(msg));
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dlclose(lib_handle);
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return -1;
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}
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// Вызываем функцию из библиотеки
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long long result = process_text(in_path, out_path, cap);
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if (result < 0) {
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die_perror("process_text failed", NULL, -1);
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}
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// Закрываем библиотеку
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dlclose(lib_handle);
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// Выводим результат
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char res[64];
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int m = snprintf(res, sizeof(res), "%lld\n", result);
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if (m > 0) {
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(void) write(STDOUT_FILENO, res, (size_t) m);
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}
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return 0;
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}
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