Data commit

Task/Unix-ls/C/unix-ls.c

@@ -0,0 +1,63 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <unistd.h>
+
+int cmpstr(const void *a, const void *b)
+{
+    return strcmp(*(const char**)a, *(const char**)b);
+}
+
+int main(void)
+{
+    DIR *basedir;
+    char path[PATH_MAX];
+    struct dirent *entry;
+    char **dirnames;
+    int diralloc = 128;
+    int dirsize  = 0;
+
+    if (!(dirnames = malloc(diralloc * sizeof(char*)))) {
+        perror("malloc error:");
+        return 1;
+    }
+
+    if (!getcwd(path, PATH_MAX)) {
+        perror("getcwd error:");
+        return 1;
+    }
+
+    if (!(basedir = opendir(path))) {
+        perror("opendir error:");
+        return 1;
+    }
+
+    while ((entry = readdir(basedir))) {
+        if (dirsize >= diralloc) {
+            diralloc *= 2;
+            if (!(dirnames = realloc(dirnames, diralloc * sizeof(char*)))) {
+                perror("realloc error:");
+                return 1;
+            }
+        }
+        dirnames[dirsize++] = strdup(entry->d_name);
+    }
+
+    qsort(dirnames, dirsize, sizeof(char*), cmpstr);
+
+    int i;
+    for (i = 0; i < dirsize; ++i) {
+        if (dirnames[i][0] != '.') {
+            printf("%s\n", dirnames[i]);
+        }
+    }
+
+    for (i = 0; i < dirsize; ++i)
+        free(dirnames[i]);
+    free(dirnames);
+    closedir(basedir);
+    return 0;
+}