sth

lab_2/main_dynamic.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dlfcn.h>
+
+#define MAX_LINE 4096
+
+typedef int (*replace_func_t)(char*, int, int*);
+
+int main(int argc, char *argv[]) {
+    if (argc != 5) {
+        fprintf(stderr, "Usage: %s <input.txt> <output.txt> <max_replacements> <libpath>\n", argv[0]);
+        return 1;
+    }
+    FILE *fin = fopen(argv[1], "r");
+    if (!fin) { perror("fopen input"); return 1; }
+    FILE *fout = fopen(argv[2], "w");
+    if (!fout) { perror("fopen output"); fclose(fin); return 1; }
+    int cap = atoi(argv[3]);
+    if (cap < 0) { fprintf(stderr, "invalid cap\n"); fclose(fin); fclose(fout); return 1; }
+
+    void *lib = dlopen(argv[4], RTLD_LAZY);
+    if (!lib) { fprintf(stderr, "dlopen error: %s\n", dlerror()); fclose(fin); fclose(fout); return 1; }
+    replace_func_t replace = (replace_func_t) dlsym(lib, "replace_char_line");
+    if (!replace) { fprintf(stderr, "dlsym error: %s\n", dlerror()); fclose(fin); fclose(fout); dlclose(lib); return 1; }
+
+    int total = 0;
+    char line[MAX_LINE];
+    while (fgets(line, sizeof(line), fin) && cap > 0) {
+        if (line[0] == '\0' || line[0] == '\n') {
+            fputs(line, fout);
+            continue;
+        }
+        int key = (unsigned char)line[0];
+        int repl_line = replace(line + 1, key, &cap);
+        total += repl_line;
+        fputc(line[0], fout);
+        fputs(line + 1, fout);
+    }
+    while (fgets(line, sizeof(line), fin)) {
+        fputs(line, fout);
+    }
+    fclose(fin); fclose(fout);
+    dlclose(lib);
+    printf("total_replacements: %d\n", total);
+    return 0;
+}