mem: add av_strndup() for duplicating substrings

1 files changed, 10 insertions, 0 deletions

diff --git a/libavutil/mem.h b/libavutil/mem.h
index 4a5e362cec..9f667c270b 100644
--- a/libavutil/mem.h
+++ b/libavutil/mem.h
@@ -218,6 +218,16 @@ av_alloc_size(1, 2) static inline void *av_mallocz_array(size_t nmemb, size_t si
 char *av_strdup(const char *s) av_malloc_attrib;
 
 /**
+ * Duplicate a substring of the string s.
+ * @param s string to be duplicated
+ * @param len the maximum length of the resulting string (not counting the
+ *            terminating byte).
+ * @return Pointer to a newly-allocated string containing a
+ * copy of s or NULL if the string cannot be allocated.
+ */
+char *av_strndup(const char *s, size_t len) av_malloc_attrib;
+
+/**
  * Free a memory block which has been allocated with av_malloc(z)() or
  * av_realloc() and set the pointer pointing to it to NULL.
  * @param ptr Pointer to the pointer to the memory block which should