From a51147467e6cf58618433286f93d17043e00b0fc Mon Sep 17 00:00:00 2001
From: Corinna Vinschen <corinna@vinschen.de>
Date: Wed, 22 Feb 2023 10:47:54 +0100
Subject: [PATCH] Cygwin: glob: perform ignore_case_with_glob on input

Rather than converting single chars on the fly to lowercase
in case ignore_case_with_glob is set, perform the conversion
on the entire input (pattern and filenames).
---
 winsup/cygwin/glob.cc | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/winsup/cygwin/glob.cc b/winsup/cygwin/glob.cc
index 2f86e4698..64c3507d8 100644
--- a/winsup/cygwin/glob.cc
+++ b/winsup/cygwin/glob.cc
@@ -95,8 +95,9 @@ __FBSDID("$FreeBSD: src/lib/libc/gen/glob.c,v 1.28 2010/05/12 17:44:00 gordon Ex
 #include "collate.h"
 
 #ifdef __CYGWIN__
-#define CCHAR(c)	(ignore_case_with_glob ? towlower (CHAR (c)) : CHAR (c))
 #define Cchar(c)	(ignore_case_with_glob ? towlower (c) : (c))
+#else
+#define Cchar(c)	(c)
 #endif
 
 #undef MAXPATHLEN
@@ -122,6 +123,7 @@ __FBSDID("$FreeBSD: src/lib/libc/gen/glob.c,v 1.28 2010/05/12 17:44:00 gordon Ex
 #define	SLASH		'/'
 #define	COMMA		','
 
+#undef DEBUG /* never define */
 #ifndef DEBUG
 
 #define	M_QUOTE		0x40000000U
@@ -252,7 +254,7 @@ glob(const char *__restrict pattern, int flags, int (*errfunc)(const char *, int
 				return (GLOB_NOMATCH);
 			else if (clen == 0)
 				break;
-			*bufnext++ = wc;
+			*bufnext++ = Cchar(wc);
 			patnext += clen;
 		}
 	} else {
@@ -272,7 +274,7 @@ glob(const char *__restrict pattern, int flags, int (*errfunc)(const char *, int
 				return (GLOB_NOMATCH);
 			else if (clen == 0)
 				break;
-			*bufnext++ = wc | prot;
+			*bufnext++ = Cchar(wc) | prot;
 			patnext += clen;
 		}
 	}
@@ -779,6 +781,19 @@ glob3(Char *pathbuf, Char *pathend, Char *pathend_last,
 				break;
 			sc += clen;
 		}
+#ifdef __CYGWIN__
+		if (ignore_case_with_glob) {
+			wint_t lower_path[MAXPATHLEN];
+			wint_t *lp = lower_path, *sp = pathend;
+
+			while ((*lp++ = towlower(*sp++)))
+				;
+			if (!match(lower_path, pattern, restpattern)) {
+				*pathend = EOS;
+				continue;
+			}
+		} else
+#endif
 		if (!match(pathend, pattern, restpattern)) {
 			*pathend = EOS;
 			continue;
@@ -932,7 +947,7 @@ match(Char *name, Char *pat, Char *patend)
 				return(0);
 			break;
 		default:
-			if (Cchar(*name++) != Cchar(*c))
+			if (*name++ != *c)
 				return(0);
 			break;
 		}