Add support for fmkpath(), formatted string mkpath()

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

README.md

@@ -232,6 +232,12 @@ Generic Functions
 
   Like `makepath()`, but also takes a `mode_t` permission mode argument.
 
+- `fmkpath(mode, fmt, ...)`
+
+  Like `mkpath()`, but takes a formatted string as argument.
+
+  > **Notice:** the swapped order of `pathname` and `mode`!
+
 - `movefile(src, dst)`
 
   Like `copyfile()`, but renames `src` to `dst`, or recreates symlink

src/lite.h

@@ -81,6 +81,7 @@ char   *lfgetkey   (lfile_t *lf, const char *key);
 int     lfgetint   (lfile_t *lf, const char *key);
 int     fgetint    (const char *file, const char *sep, const char *key);
 
+int     fmkpath    (mode_t mode, const char *fmt, ...);
 int     mkpath     (const char *dir, mode_t mode);
 int     makepath   (const char *dir);
 

src/makepath.c

@@ -17,6 +17,8 @@
 
 #include <errno.h>
 #include <libgen.h>
+#include <stdarg.h>
+#include <stdlib.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include "lite.h"
@@ -46,6 +48,38 @@ int mkpath(const char *dir, mode_t mode)
 	return mkdir(dir, mode);
 }
 
+/**
+ * fmkpath - Formatted version of mkpath()
+ * @mode: A &mode_t mode to create directories with
+ * @fmt:  Formatted string to be composed into a pathname
+ *
+ * Note:
+ * Notice the swapped arguments, compared to mkpath()!
+ *
+ * Returns:
+ * POSIX OK(0) on success, otherwise -1 with @errno set.
+ */
+int fmkpath(mode_t mode, const char *fmt, ...)
+{
+	va_list ap;
+	char *path;
+	int len;
+
+	va_start(ap, fmt);
+	len = vsnprintf(NULL, 0, fmt, ap);
+	va_end(ap);
+
+	path = alloca(len + 1);
+	if (!path)
+		return -1;
+
+	va_start(ap, fmt);
+	len = vsnprintf(path, len + 1, fmt, ap);
+	va_end(ap);
+
+	return mkpath(path, mode);
+}
+
 /**
  * makepath - Create all components of the specified directory.
  * @dir: Directory to create.

tests/makepath.c

@@ -4,6 +4,8 @@
 #include <stdlib.h>
 #include "check.h"
 
+#define BASEDIR "/tmp/libite-test"
+
 int checkpath(const char *dir)
 {
 	char tmp[256];
@@ -32,28 +34,48 @@ int test_makepath(const char *dir)
 	return ret;
 }
 
+int test_fmkpath(const char *subdir)
+{
+	int ret;
+
+	ret = fmkpath(0755, "%s/%s", BASEDIR, subdir);
+	if (!ret) {
+		char tmp[256];
+
+		snprintf(tmp, sizeof(tmp), "%s/%s", BASEDIR, subdir);
+		ret = checkpath(tmp);
+	} else
+		perror("Failed");
+
+	return ret;
+}
+
 int main(void)
 {
 	int i, ret = 0;
 	char *list[] = {
-		"/tmp/libite-test/tok/",
-		"/tmp/libite-test/tok2",
-		"/tmp/libite-test/ab",
-		"/tmp/libite-test/b",
-		"/tmp/libite-test/a/",
-		"/tmp/libite-test/a/b",
-		"/tmp/libite-test/a/c/",
+		BASEDIR "/tok/",
+		BASEDIR "/tok2",
+		BASEDIR "/ab",
+		BASEDIR "/b",
+		BASEDIR "/a/",
+		BASEDIR "/a/b",
+		BASEDIR "/a/c/",
 		NULL
 	};
 
-	printf("Testing makepath() ...\n");
-	mkdir("/tmp/libite-test", 0755);
+	mkdir(BASEDIR, 0755);
 
+	printf("PASS 1/2: makepath() ======================================\n");
 	for (i = 0; list[i] && !ret; i++)
 		ret |= test_makepath(list[i]);
 
-	printf("\nCleaning up ...\n");
-	system("rm -rf /tmp/libite-test");
+	printf("PASS 2/2: fmkpath() =======================================\n");
+	for (i = 0; list[i] && !ret; i++)
+		ret |= test_fmkpath(list[i] + strlen(BASEDIR) + 1);
+
+	printf("DONE: Cleaning up =========================================\n");
+	system("rm -rf " BASEDIR);
 
 	return ret;
 }