common: cast arguments to character classification functions to unsigned char

[babeltrace.git] / src / plugins / ctf / fs-sink / translate-trace-ir-to-ctf-ir.c

diff --git a/src/plugins/ctf/fs-sink/translate-trace-ir-to-ctf-ir.c b/src/plugins/ctf/fs-sink/translate-trace-ir-to-ctf-ir.c
index c808ef0a76c334a12cd9af7c712397fa295b4ffb..e0a03b2e8be3d02c867e7863f7a8f908d86c8a0c 100644 (file)
--- a/src/plugins/ctf/fs-sink/translate-trace-ir-to-ctf-ir.c
+++ b/src/plugins/ctf/fs-sink/translate-trace-ir-to-ctf-ir.c
@@ -154,14 +154,14 @@ bool ist_valid_identifier(const char *name)
        }
 
        /* Make sure the name starts with a letter or `_` */
-       if (!isalpha(name[0]) && name[0] != '_') {
+       if (!isalpha((unsigned char) name[0]) && name[0] != '_') {
                ist_valid = false;
                goto end;
        }
 
        /* Make sure the name only contains letters, digits, and `_` */
        for (at = name; *at != '\0'; at++) {
-               if (!isalnum(*at) && *at != '_') {
+               if (!isalnum((unsigned char) *at) && *at != '_') {
                        ist_valid = false;
                        goto end;
                }