1 files changed, 3 insertions, 3 deletions

diff --git a/src/base64.c b/src/base64.c
index 65c6061..e558d9e 100644
--- a/src/base64.c
+++ b/src/base64.c
@@ -104,9 +104,9 @@ static int base64decode_block(unsigned char *target, const char *data, size_t da
 
 unsigned char *base64decode(const char *buf, size_t *size)
 {
-        if (!buf) return;
+        if (!buf) return NULL;
         size_t len = strlen(buf);
-        if (len <= 0) return;
+        if (len <= 0) return NULL;
         unsigned char *outbuf = (unsigned char*)malloc((len/4)*3+3);
 
         unsigned char *line;
@@ -114,7 +114,7 @@ unsigned char *base64decode(const char *buf, size_t *size)
 
         line = (unsigned char*)strtok((char*)buf, "\r\n\t ");
         while (line) {
-                p+=base64decode_block(outbuf+p, line, strlen((char*)line));
+                p+=base64decode_block(outbuf+p, (const char*)line, strlen((char*)line));
 
                 // get next line of base64 encoded block
                 line = (unsigned char*)strtok(NULL, "\r\n\t ");