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-rw-r--r--ft_strmapi.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/ft_strmapi.c b/ft_strmapi.c
index 2ded74e..7784980 100644
--- a/ft_strmapi.c
+++ b/ft_strmapi.c
@@ -19,6 +19,8 @@ char *ft_strmapi(char *s, char (*f)(unsigned int, char))
size_t len;
char *mapped;
+ if (s == NULL || f == NULL)
+ return (NULL);
len = ft_strlen(s);
if ((mapped = (char*)malloc(sizeof(char) * (len + 1))) == NULL)
return (NULL);