Use ctype macros with unsigned char arguments.
diff --git a/libarchive/archive_read_support_format_warc.c b/libarchive/archive_read_support_format_warc.c
index b162465..e875385 100644
--- a/libarchive/archive_read_support_format_warc.c
+++ b/libarchive/archive_read_support_format_warc.c
@@ -600,9 +600,10 @@
/* looks good so far, read the version number for a laugh */
buf += sizeof(magic) - 1U;
- if (isdigit(buf[0U]) && (buf[1U] == '.') && isdigit(buf[2U])) {
+ if (isdigit((unsigned char)buf[0U]) && (buf[1U] == '.') &&
+ isdigit((unsigned char)buf[2U])) {
/* we support a maximum of 2 digits in the minor version */
- if (isdigit(buf[3U]))
+ if (isdigit((unsigned char)buf[3U]))
end = 1U;
/* set up major version */
ver = (buf[0U] - '0') * 10000U;
@@ -686,7 +687,7 @@
/* spaces inside uri are not allowed, CRLF should follow */
for (p = val; p < eol; p++) {
- if (isspace(*p))
+ if (isspace((unsigned char)*p))
return res;
}
@@ -736,7 +737,7 @@
while (val < eol && (*val == ' ' || *val == '\t'))
val++;
/* there must be at least one digit */
- if (!isdigit(*val))
+ if (!isdigit((unsigned char)*val))
return -1;
len = strtol(val, &on, 10);
if (on != eol) {
