Merge pull request #30 from tim-tm/rmdir

partially implement rmdir

src/rmdir/rmdir.c

@@ -1,6 +1,98 @@
 #include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <dirent.h>
+#include <sys/stat.h>
+#include <errno.h>
 
-int main(void) {
-  printf("Hello, World!\n");
+#define NAME "rmdir (canoutils)"
+#define VERSION "1.0.0"
+#define AUTHOR "tim-tm"
+
+#define print_version()                                                        \
+  do {                                                                         \
+    printf("%s\nversion: %s\nby: %s\n", NAME, VERSION, AUTHOR);                \
+  } while (0)
+
+bool ignore_fail = false;
+bool parents = false;
+bool verbose = false;
+
+int rm_dir(char *dirname) {
+  if (dirname == NULL) {
+    fprintf(stderr, "Directory name must be specified.\n");
+    return 1;
+  }
+
+  struct stat stat_path;
+  stat(dirname, &stat_path);
+  if (S_ISDIR(stat_path.st_mode) == 0) {
+    fprintf(stderr, "'%s' is not a directory.\n", dirname);
+    return 1;
+  }
+
+  DIR *dir = opendir(dirname);
+  if (dir == NULL) {
+    fprintf(stderr, "Failed to open '%s': %s\n", dirname, strerror(errno));
+    return 1;
+  }
+
+  int n = 0;
+  struct dirent *dent;
+  while ((dent = readdir(dir)) != NULL) {
+    if (++n > 2) break;
+  }
+  closedir(dir);
+
+  if (n <= 2) { // Directory is empty (the two entries are '.' and '..')
+    if (remove(dirname) != 0) {
+      fprintf(stderr, "Failed to remove '%s': %s\n", dirname, strerror(errno));
+      return 1;
+    } else if (verbose) {
+      printf("Removing '%s'\n", dirname);
+    }
+  } else if (!ignore_fail) {
+    fprintf(stderr, "'%s' must be empty.\n", dirname);
+    return 1;
+  }
   return 0;
-}
+}
+
+int main(int argc, char **argv) {
+  if (argc <= 1) {
+    fprintf(stderr, "Not enough arguments.\nSee rmdir --help for more information.\n");
+    return 1;
+  }
+
+  if (strcmp(argv[1], "--version") == 0) {
+    print_version();
+    return 0;
+  }
+  if (strcmp(argv[1], "--help") == 0) {
+    system("man rmdir");
+    return 0;
+  }
+
+  if (argc == 2) {
+    return rm_dir(argv[1]);
+  }
+
+  for (int i = 1; i < argc-1; ++i) {
+    if (strcmp(argv[i], "-p") == 0 || strcmp(argv[i], "--parents") == 0) {
+      parents = true;
+    } else if (strcmp(argv[i], "-v") == 0 || strcmp(argv[i], "--verbose") == 0) {
+      verbose = true;
+    } else if (strcmp(argv[i], "--ignore-fail-on-non-empty") == 0) {
+      ignore_fail = true;
+    }
+  }
+
+  if (parents) {
+    // TODO: Implement -p|--parents flag
+    return 0;
+  } else {
+    return rm_dir(argv[argc-1]);
+  }
+}
+