index: Add a function for converting an index into a string.

1 files changed, 28 insertions, 0 deletions

diff --git a/index.c b/index.c
index 2571a61..d996b45 100644
--- a/index.c
+++ b/index.c
@@ -4,6 +4,17 @@
 #include "index.h"
 #include "macros.h"
 
+static int index_strlen(index *idx) {
+	int len = 0;
+	/* Get the length of the index. */
+	for (index *i = idx; i != NULL; i = i->next) {
+		const int is_last = (i->next == NULL);
+		const char *fmt = (i->type) "%llu" : "%s";
+		len += format_len(fmt, (i->type) ? i->num : i->name) + !is_last;
+	}
+	return len;
+}
+
 int is_valid_index(index *idx) {
 	int did_alloc = 0;
 	char *err_str = NULL;
@@ -68,3 +79,20 @@ char *make_index_path(const char *root, index *idx, int path_type) {
 
 	return path;
 }
+
+char *index_to_str(index *idx) {
+	if (is_valid_index(idx)) {
+		char *idx_str = calloc(index_strlen(idx)+1, sizeof(char));
+		char *tmp = idx_str;
+		/* Create the index. */
+		for (index *i = idx; i != NULL; i = i->next) {
+			const int is_last = (i->next == NULL);
+			const char *fmt = (i->type) "%llu%s" : "%s%s";
+
+			tmp += sprintf(tmp, fmt, (i->type) ? i->num : i->name, (!is_last) ? "-" : "");
+		}
+		return idx_str;
+	} else {
+		return NULL;
+	}
+}