vorking #2 both guys

lab_2/kirill/main_d.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <stdlib.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 <in> <out> <cap> <path_to_so>\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());
+        dlclose(lib);
+        fclose(fin);
+        fclose(fout);
+        return 1;
+    }
+
+    int total = 0;
+    char line[MAX_LINE];
+
+    while (fgets(line, sizeof(line), fin)) {
+        if (cap > 0) {
+            int key = (unsigned char)line[0];
+            int repl_line = replace(line, key, &cap);
+            total += repl_line;
+        }
+        fputs(line, fout);
+    }
+
+    dlclose(lib);
+    fclose(fin);
+    fclose(fout);
+    printf("total_replacements: %d\n", total);
+    return 0;
+}