Prevent false-positive result

* Return zero on error

2 files changed, 4 insertions, 4 deletions

diff --git a/include/str.h b/include/str.h
index 895b8cc..595a055 100644
--- a/include/str.h
+++ b/include/str.h
@@ -29,7 +29,7 @@ int num_chars(const char *sptr, int ch);
  *
  * @param sptr string to scan
  * @param pattern string to search for
- * @return 1 = found, 0 = not found, -1 = error
+ * @return 1 = found, 0 = not found / error
  */
 int startswith(const char *sptr, const char *pattern);
 
@@ -38,7 +38,7 @@ int startswith(const char *sptr, const char *pattern);
  *
  * @param sptr string to scan
  * @param pattern string to search for
- * @return 1 = found, 0 = not found, -1 = error
+ * @return 1 = found, 0 = not found / error
  */
 int endswith(const char *sptr, const char *pattern);
 
diff --git a/src/str.c b/src/str.c
index f27e946..16088b6 100644
--- a/src/str.c
+++ b/src/str.c
@@ -16,7 +16,7 @@ int num_chars(const char *sptr, int ch) {
 
 int startswith(const char *sptr, const char *pattern) {
     if (!sptr || !pattern) {
-        return -1;
+        return 0;
     }
     for (size_t i = 0; i < strlen(pattern); i++) {
         if (sptr[i] != pattern[i]) {
@@ -28,7 +28,7 @@ int startswith(const char *sptr, const char *pattern) {
 
 int endswith(const char *sptr, const char *pattern) {
     if (!sptr || !pattern) {
-        return -1;
+        return 0;
     }
     ssize_t sptr_size = (ssize_t) strlen(sptr);
     ssize_t pattern_size = (ssize_t) strlen(pattern);