Add spice_strnlen

common/mem.c

@@ -28,6 +28,18 @@
 }
 #endif
 
+size_t spice_strnlen(const char *str, size_t max_len)
+{
+    size_t len = 0;
+
+    while (len < max_len && *str != 0) {
+        len++;
+        str++;
+    }
+
+    return len;
+}
+
 char *spice_strdup(const char *str)
 {
     char *copy;

common/mem.h

@@ -33,6 +33,8 @@ void *spice_malloc_n_m(size_t n_blocks, size_t n_block_bytes, size_t extra_size)
 void *spice_malloc0_n(size_t n_blocks, size_t n_block_bytes) SPICE_GNUC_MALLOC SPICE_GNUC_ALLOC_SIZE2(1,2);
 void *spice_realloc_n(void *mem, size_t n_blocks, size_t n_block_bytes) SPICE_GNUC_WARN_UNUSED_RESULT;
 
+size_t spice_strnlen(const char *str, size_t max_len);
+
 /* Optimize: avoid the call to the (slower) _n function if we can
  * determine at compile-time that no overflow happens.
  */