commit - a45aafaf9bf7910fed713ff35d6d051d463bae98
commit + 99fd9ff4bf6d3bee4a29f13ef4ae81aa36fdd4d5
blob - a487dffb531fb051aa859f3c1ac13816fdfcd926
blob + 6f80f2dd7f9d638f38ae4b28c4b4b1e0f480b7fe
--- lib/gitproto.c
+++ lib/gitproto.c
@@ -54,13 +54,13 @@ tokenize_line(char **tokens, char *line, int len, int 
 		tokens[i] = NULL;
 
 	for (i = 0; n < len && i < maxtokens; i++) {
-		while (isspace(*line)) {
+		while (isspace((unsigned char)*line)) {
 			line++;
 			n++;
 		}
 		p = line;
 		while (*line != '\0' && n < len &&
-		    (!isspace(*line) || i == maxtokens - 1)) {
+		    (!isspace((unsigned char)*line) || i == maxtokens - 1)) {
 			line++;
 			n++;
 		}
blob - 114e0ca8c6f110af5f8ebfd87ac1cdd552fbc92c
blob + d462598db9e15145bb7cda1fc9ca7357de35b04a
--- lib/object_parse.c
+++ lib/object_parse.c
@@ -410,12 +410,14 @@ parse_gmtoff(time_t *gmtoff, const char *tzstr)
 	else if (*p != '+')
 		return got_error(GOT_ERR_BAD_OBJ_DATA);
 	p++;
-	if (!isdigit(*p) && !isdigit(*(p + 1)))
+	if (!isdigit((unsigned char)*p) &&
+	    !isdigit((unsigned char)*(p + 1)))
 		return got_error(GOT_ERR_BAD_OBJ_DATA);
 	h = (((*p - '0') * 10) + (*(p + 1) - '0'));
 
 	p += 2;
-	if (!isdigit(*p) && !isdigit(*(p + 1)))
+	if (!isdigit((unsigned char)*p) &&
+	    !isdigit((unsigned char)*(p + 1)))
 		return got_error(GOT_ERR_BAD_OBJ_DATA);
 	m = ((*p - '0') * 10) + (*(p + 1) - '0');
 
blob - 52cedcef2588aa0c074d4d486c05e33a3bac7eb4
blob + 4330e9e71a7dcd41735ee2f4222e4f39e824d121
--- lib/pkt.c
+++ lib/pkt.c
@@ -144,7 +144,7 @@ got_pkt_readpkt(int *outlen, int fd, char *buf, int bu
 	if (chattygot > 1) {
 		fprintf(stderr, "%s: readpkt: %zd:\t", getprogname(), n);
 		for (i = 0; i < n; i++) {
-			if (isprint(buf[i]))
+			if (isprint((unsigned char)buf[i]))
 				fputc(buf[i], stderr);
 			else
 				fprintf(stderr, "[0x%.2x]", buf[i]);
@@ -179,7 +179,7 @@ got_pkt_writepkt(int fd, char *buf, int nbuf, int chat
 	if (chattygot > 1) {
 		fprintf(stderr, "%s: writepkt: %s:\t", getprogname(), len);
 		for (i = 0; i < nbuf; i++) {
-			if (isprint(buf[i]))
+			if (isprint((unsigned char)buf[i]))
 				fputc(buf[i], stderr);
 			else
 				fprintf(stderr, "[0x%.2x]", buf[i]);
blob - 4fa55782d6cfa72a92ffedfb310e3ac0e508e55c
blob + 07e2042c17a6d66588622b9d6a7fb1e9c158cfbd
--- libexec/got-fetch-pack/got-fetch-pack.c
+++ libexec/got-fetch-pack/got-fetch-pack.c
@@ -208,7 +208,7 @@ fetch_error(const char *buf, size_t len)
 	size_t i;
 
 	for (i = 0; i < len && i < sizeof(msg) - 1; i++) {
-		if (!isprint(buf[i]))
+		if (!isprint((unsigned char)buf[i]))
 			return got_error_msg(GOT_ERR_BAD_PACKET,
 			    "non-printable error message received from server");
 		msg[i] = buf[i];
blob - 7069d8b17d0928e260d85033e81ff7ac104c27dd
blob + 1d25734c98460f62110adce7185d5a73c017c8ad
--- libexec/got-send-pack/got-send-pack.c
+++ libexec/got-send-pack/got-send-pack.c
@@ -181,7 +181,7 @@ send_error(const char *buf, size_t len)
 	size_t i;
 
 	for (i = 0; i < len && i < sizeof(msg) - 1; i++) {
-		if (!isprint(buf[i]))
+		if (!isprint((unsigned char)buf[i]))
 			return got_error_msg(GOT_ERR_BAD_PACKET,
 			    "non-printable error message received from server");
 		msg[i] = buf[i];