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 b1624651426cf294fc5ab8599021183462a90fe4..e8753853f3c8637eca42c8fdefa40ad91592b8e8 100644 (file)
--- a/libarchive/archive_read_support_format_warc.c
+++ b/libarchive/archive_read_support_format_warc.c
@@ -600,9 +600,10 @@ _warc_rdver(const char *buf, size_t bsz)
        /* 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 @@ _warc_rduri(const char *buf, size_t bsz)
 
        /* 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 @@ _warc_rdlen(const char *buf, size_t bsz)
        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) {