init commit

3sem/cnts/contest6/01.c

@@ -0,0 +1,55 @@
+#include <stdio.h>     // Standard I/O functions
+#include <stdlib.h>    // Standard library functions: memory allocation, process control, conversions, etc.
+#include <unistd.h>    // POSIX API: read, write, close, etc.
+#include <sys/types.h> // Data types used in system calls
+#include <sys/stat.h>  // Data returned by the functions fstat(), lstat(), and stat()
+#include <limits.h>    // Sizes of basic types
+#include <dirent.h>    // Directory entry format
+#include <string.h>    // String handling functions
+
+enum
+{
+    ARGS_NUM = 2,
+};
+
+int
+main(int argc, char *argv[])
+{
+    if (argc != ARGS_NUM) {
+        fprintf(stderr, "Wrong number of arguments\n");
+        return 1;
+    }
+
+    int n = 0;
+
+    DIR *ddir = opendir(argv[1]);
+    struct dirent *de;
+    while ((de = readdir(ddir))) {
+        char *name = calloc(PATH_MAX, sizeof(char));
+        if (!name) {
+            return 1;
+        }
+
+        int ret = snprintf(name, PATH_MAX, "%s/%s", argv[1], de->d_name);
+        if (ret < 0 || ret >= PATH_MAX) {
+            free(name);
+            return 1;
+        }
+
+        struct stat st;
+        if (stat(name, &st) < 0) {
+            continue;
+        }
+        char ext[] = ".exe";
+        if (S_ISREG(st.st_mode) && !access(name, X_OK) && strlen(name) >= 4 &&
+            !strcmp(name + strlen(name) - (sizeof(ext) - 1), ext)) {
+            ++n;
+        }
+    }
+
+    printf("%d\n", n);
+
+    closedir(ddir);
+
+    return 0;
+}