From 245e9d55aece2f1749a00909a829958feb483459 Mon Sep 17 00:00:00 2001
From: Jan Janssen <medhefgo@web.de>
Date: Thu, 2 Dec 2021 13:06:07 +0100
Subject: [PATCH] boot: Add strncasecmpa helper function

---
 src/boot/efi/util.c | 21 +++++++++++++++++++++
 src/boot/efi/util.h |  4 ++++
 2 files changed, 25 insertions(+)

diff --git a/src/boot/efi/util.c b/src/boot/efi/util.c
index 04e390b0fa7..443a3bd3800 100644
--- a/src/boot/efi/util.c
+++ b/src/boot/efi/util.c
@@ -649,6 +649,27 @@ UINTN strnlena(const CHAR8 *p, UINTN maxlen) {
         return c;
 }
 
+INTN strncasecmpa(const CHAR8 *a, const CHAR8 *b, UINTN maxlen) {
+        if (!a || !b)
+                return CMP(a, b);
+
+        while (maxlen > 0) {
+                CHAR8 ca = *a, cb = *b;
+                if (ca >= 'A' && ca <= 'Z')
+                        ca += 'a' - 'A';
+                if (cb >= 'A' && cb <= 'Z')
+                        cb += 'a' - 'A';
+                if (!ca || ca != cb)
+                        return ca - cb;
+
+                a++;
+                b++;
+                maxlen--;
+        }
+
+        return 0;
+}
+
 CHAR8 *xstrndup8(const CHAR8 *p, UINTN sz) {
         CHAR8 *n;
 
diff --git a/src/boot/efi/util.h b/src/boot/efi/util.h
index 425d25d73f9..07ffcdc1ef9 100644
--- a/src/boot/efi/util.h
+++ b/src/boot/efi/util.h
@@ -130,6 +130,10 @@ EFI_STATUS readdir_harder(EFI_FILE_HANDLE handle, EFI_FILE_INFO **buffer, UINTN
 
 UINTN strnlena(const CHAR8 *p, UINTN maxlen);
 CHAR8 *xstrndup8(const CHAR8 *p, UINTN sz);
+INTN strncasecmpa(const CHAR8 *a, const CHAR8 *b, UINTN maxlen);
+static inline BOOLEAN strncaseeqa(const CHAR8 *a, const CHAR8 *b, UINTN maxlen) {
+        return strncasecmpa(a, b, maxlen) == 0;
+}
 
 BOOLEAN is_ascii(const CHAR16 *f);
 
-- 
2.47.3