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-rw-r--r--st.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/st.c b/st.c
index ede7ae6..a8f8232 100644
--- a/st.c
+++ b/st.c
@@ -366,7 +366,7 @@ char
base64dec_getc(const char **src)
{
while (**src && !isprint(**src)) (*src)++;
- return *((*src)++);
+ return **src ? *((*src)++) : '='; /* emulate padding if string ends */
}
char *
@@ -384,6 +384,10 @@ base64dec(const char *src)
int c = base64_digits[(unsigned char) base64dec_getc(&src)];
int d = base64_digits[(unsigned char) base64dec_getc(&src)];
+ /* invalid input. 'a' can be -1, e.g. if src is "\n" (c-str) */
+ if (a == -1 || b == -1)
+ break;
+
*dst++ = (a << 2) | ((b & 0x30) >> 4);
if (c == -1)
break;