diff options
| -rw-r--r-- | src/vasprintf.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/vasprintf.c b/src/vasprintf.c index de3b49fae..ff50a931c 100644 --- a/src/vasprintf.c +++ b/src/vasprintf.c @@ -645,7 +645,13 @@ buffer_widen (struct string_buffer *b, size_t len) static int buffer_cat (struct string_buffer *b, const char *s, size_t len) { - MPFR_ASSERTD (len > 0); + /* If len == 0, which is possible when outputting an integer 0 + (either a native one or mpfr_prec_t) with precision field = 0, + do nothing. This test is not necessary since the code below is + valid for len == 0, but this is safer, just in case. */ + if (len == 0) + return 0; + MPFR_ASSERTD (len <= strlen (s)); if (buffer_incr_len (b, len)) |