Add readlink and readmagiclink functions

Signed-off-by: Mattias Andrée <maandree@kth.se>

1 files changed, 61 insertions, 0 deletions

diff --git a/readmagiclink.c b/readmagiclink.c
new file mode 100644
index 0000000..160dd96
--- /dev/null
+++ b/readmagiclink.c
@@ -0,0 +1,61 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+#ifndef TEST
+
+
+char *
+libsimple_readmagiclink(const char *path)
+{
+	int fd;
+	struct stat st;
+	char *target1;
+	char *target2;
+
+	fd = open(path, O_PATH | O_NOFOLLOW);
+	if (fd < 0)
+		return NULL;
+
+	target1 = libsimple_efreadlink(fd);
+	if (!strends(target1, " (deleted)")) {
+		close(fd);
+		return target1;
+	}
+
+	if (fstat(fd, &st)) {
+		free(target1);
+		close(fd);
+		return NULL;
+	}
+
+	target2 = libsimple_efreadlink(fd);
+	if (!strends(target2, " (deleted)")) {
+		free(target1);
+		close(fd);
+		return target2;
+	}
+
+	close(fd);
+
+	if (strcmp(target1, target2)) {
+		free(target2);
+		return target1;
+	} else {
+		free(target1);
+		if (st.st_nlink)
+			return target2;
+		target2[strlen(target2) - (sizeof(" (deleted)") - 1U)] = '\0';
+		return target2;
+	}
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void) /* TODO test */
+{
+	return 0;
+}
+
+#endif