Cast signed chars before ctype calls

A plain char is undefined in the ctype functions for negative values,
which a high byte produces wherever char is signed.

1 file changed, 2 insertions, 2 deletions

diff --git a/source/ui-log.c b/source/ui-log.c
index 9906bbc..d3610d3 100644
--- a/source/ui-log.c
+++ b/source/ui-log.c
@@ -350,13 +350,13 @@ static char *next_token(char **src)
 
 	if (!src || !*src)
 		return NULL;
-	while (isspace(**src))
+	while (isspace((unsigned char)**src))
 		(*src)++;
 	if (!**src)
 		return NULL;
 	result = *src;
 	while (**src) {
-		if (isspace(**src)) {
+		if (isspace((unsigned char)**src)) {
 			**src = '\0';
 			(*src)++;
 			break;