properly set errno

1 files changed, 6 insertions, 1 deletions

diff --git a/fuzzy.c b/fuzzy.c
index c82d3c1..a9e6d4a 100644
--- a/fuzzy.c
+++ b/fuzzy.c
@@ -23,6 +23,7 @@
  */
 
 #include <assert.h>
+#include <errno.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -112,6 +113,7 @@ struct fuzzy_state {
 /*@only@*/ /*@null@*/ struct fuzzy_state *fuzzy_new(void) {
 	struct fuzzy_state *self;
 	if(NULL == (self = malloc(sizeof(struct fuzzy_state))))
+		/* malloc sets ENOMEM */
 		return NULL;
 	self->bhstart = 0;
 	self->bhend = 1;
@@ -222,9 +224,11 @@ int fuzzy_digest(const struct fuzzy_state *self, /*@out@*/ char *result) {
 	/* Initial blocksize guess. */
 	while((size_t)SSDEEP_BS(bi) * SPAMSUM_LENGTH < self->total_size) {
 		++bi;
-		if(bi >= SSDEEP_BS(NUM_BLOCKHASHES))
+		if(bi >= NUM_BLOCKHASHES) {
 			/* The input exceeds data types. */
+			errno = EOVERFLOW;
 			return -1;
+		}
 	}
 	/* Adapt blocksize guess to actual digest length. */
 	while(bi >= self->bhend)
@@ -235,6 +239,7 @@ int fuzzy_digest(const struct fuzzy_state *self, /*@out@*/ char *result) {
 
 	i = snprintf(result, (size_t)remain, "%u:", SSDEEP_BS(bi));
 	if(i <= 0)
+		/* Maybe snprintf has set errno here? */
 		return -1;
 	assert(i < remain);
 	remain -= i;