From: Karel Zak <kzak@redhat.com>
Date: Tue, 1 Apr 2025 17:45:01 +0200
Subject: libblkid: avoid strcasecmp() for ASCII-only strings

Use cctype.h for locale-independent string comparison and to avoid
tricky string conversions like in tr_TR locales.

Signed-off-by: Karel Zak <kzak@redhat.com>
(cherry picked from commit 7eb663503c77d739f2cc80d78ee9d380b11b6eb9)
---
 libblkid/src/config.c                | 3 ++-
 libblkid/src/partitions/partitions.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libblkid/src/config.c b/libblkid/src/config.c
index dcc18f2..934d28d 100644
--- a/libblkid/src/config.c
+++ b/libblkid/src/config.c
@@ -29,6 +29,7 @@
 
 #include "blkidP.h"
 #include "env.h"
+#include "cctype.h"
 
 static int parse_evaluate(struct blkid_config *conf, char *s)
 {
@@ -94,7 +95,7 @@ static int parse_next(FILE *fd, struct blkid_config *conf)
 
 	if (!strncmp(s, "SEND_UEVENT=", 12)) {
 		s += 12;
-		if (*s && !strcasecmp(s, "yes"))
+		if (*s && !c_strcasecmp(s, "yes"))
 			conf->uevent = TRUE;
 		else if (*s)
 			conf->uevent = FALSE;
diff --git a/libblkid/src/partitions/partitions.c b/libblkid/src/partitions/partitions.c
index 07a5d1a..9df813c 100644
--- a/libblkid/src/partitions/partitions.c
+++ b/libblkid/src/partitions/partitions.c
@@ -23,6 +23,7 @@
 #include "partitions.h"
 #include "sysfs.h"
 #include "strutils.h"
+#include "cctype.h"
 
 /**
  * SECTION: partitions
@@ -1044,7 +1045,7 @@ blkid_partition blkid_partlist_devno_to_partition(blkid_partlist ls, dev_t devno
 			tmp = uuid;
 			prefix = uuid ? strsep(&tmp, "-") : NULL;
 
-			if (prefix && strncasecmp(prefix, "part", 4) == 0) {
+			if (prefix && c_strncasecmp(prefix, "part", 4) == 0) {
 				char *end = NULL;
 
 				errno = 0;