Add recursive mkpath() and makepath(), works like mkdir -p

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

makepath.c

@@ -0,0 +1,120 @@
+/* mkpath() -- Create all components leading up to a given directory
+ *
+ * Copyright (c) 2013  Joachim Nilsson <troglobit@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <errno.h>
+#include <libgen.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+int mkpath(char *dir, mode_t mode)
+{
+	if (!dir) {
+		errno = EINVAL;
+		return 1;
+	}
+
+	if (strlen(dir) == 1 && dir[0] == '/')
+		return 0;
+
+	mkpath(dirname(strdupa(dir)), mode);
+
+	return mkdir(dir, mode);
+}
+
+/**
+ * makepath - Create all components of the specified directory.
+ * @dir: Directory to create.
+ *
+ * Returns:
+ * POSIX OK (0) on success, otherwise -1 and errno set appropriately.
+ * This function returns EINVAL on bad argument, or ENOMEM when it
+ * fails allocating temporary memory.  For other error codes see the
+ * mkdir() syscall description.
+ */
+int makepath(char *dir)
+{
+	return mkpath(dir, 0777);
+}
+
+/********************************* UNIT TESTS ************************************/
+#ifdef UNITTEST
+#include <stdio.h>
+
+int checkpath(char *dir)
+{
+	char tmp[256];
+	struct stat sb;
+
+	snprintf(tmp, sizeof(tmp), "ls -ld %s", dir);
+	system(tmp);
+
+	if (!stat(dir, &sb) && S_ISDIR(sb.st_mode))
+		return 0;
+
+	errno = ENOTDIR;
+	return 1;
+}
+
+int test_makepath(char *dir)
+{
+	int ret = makepath(dir);
+
+	if (!ret)
+		ret = checkpath(dir);
+	if (ret)
+		perror("Failed");
+
+	return ret;
+}
+
+int main(void)
+{
+	int i, ret = 0;
+	char *list[] = {
+		"/tmp/tok/",
+		"/tmp/tok2",
+		"/tmp/ab",
+		"/tmp/b",
+		"/tmp/a/",
+		"/tmp/a/b",
+		"/tmp/a/c/",
+		NULL
+	};
+
+	fprintf(stderr, "Testing makepath() ...\n");
+	for (i = 0; list[i] && !ret; i++)
+		ret = test_makepath(list[i]);
+
+	fprintf(stderr, "\nCleaning up ...\n");
+	for (i = 0; list[i]; i++)
+		rmdir(list[i]);
+
+	return ret;
+}
+#endif  /* UNITTEST */
+
+/**
+ * Local Variables:
+ *  compile-command: "gcc -g -o unittest -D_GNU_SOURCE -DUNITTEST makepath.c && ./unittest"
+ *  version-control: t
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */