Vendor in some support code

1 files changed, 45 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..93c6e91
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,45 @@
+#include <assert.h>
+#include <errno.h>
+#include <libgen.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include "util.h"
+
+static void
+posix_dirname(char *path, char *dname)
+{
+	char p[PATH_MAX+1];
+	char *t;
+
+	assert(strlen(path) <= PATH_MAX);
+
+	strcpy(p, path);
+	t = dirname(path);
+	memmove(dname, t, strlen(t) + 1);
+
+	/* restore the path if dirname worked in-place */
+	if (t == path && path != dname) {
+		strcpy(path, p);
+	}
+}
+
+/** Make directory and all of its parents */
+int
+mkdirs(char *path, mode_t mode)
+{
+	char dname[PATH_MAX + 1];
+	posix_dirname(path, dname);
+	if (strcmp(dname, "/") == 0) {
+		return 0;
+	}
+	if (mkdirs(dname, mode) != 0) {
+		return -1;
+	}
+	if (mkdir(path, mode) != 0 && errno != EEXIST) {
+		return -1;
+	}
+	errno = 0;
+	return 0;
+}