From 6cdb407aa23d8b129e9b9a49a4528c3e0def69e6 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Fri, 19 Apr 2024 14:15:30 -0400
Subject: config: Check for strerror_[lr]()

---
 src/bfstd.c | 42 ++++++++++++++++++++----------------------
 1 file changed, 20 insertions(+), 22 deletions(-)

(limited to 'src/bfstd.c')

diff --git a/src/bfstd.c b/src/bfstd.c
index e2c2b97..1144380 100644
--- a/src/bfstd.c
+++ b/src/bfstd.c
@@ -317,35 +317,33 @@ const char *xstrerror(int errnum) {
 	const char *ret = NULL;
 	static thread_local char buf[256];
 
-	// - __APPLE__
-	// - __COSMOPOLITAN__
-	//     - No strerror_l()
-	// - __FreeBSD__ && SANITIZE_MEMORY
-	//     - duplocale() triggers https://github.com/llvm/llvm-project/issues/65532
-#if __APPLE__ || __COSMOPOLITAN__ || (__FreeBSD__ && SANITIZE_MEMORY)
-	if (strerror_r(errnum, buf, sizeof(buf)) == 0) {
-		ret = buf;
-	}
-#else
-#  if __NetBSD__
-	// NetBSD has no thread-specific locales
-	locale_t loc = LC_GLOBAL_LOCALE;
-#  else
+	// On FreeBSD with MemorySanitizer, duplocale() triggers
+	// https://github.com/llvm/llvm-project/issues/65532
+#if BFS_HAS_STRERROR_L && !(__FreeBSD__ && SANITIZE_MEMORY)
+#  if BFS_HAS_USELOCALE
 	locale_t loc = uselocale((locale_t)0);
+#  else
+	locale_t loc = LC_GLOBAL_LOCALE;
 #  endif
 
-	locale_t copy = loc;
-	if (copy == LC_GLOBAL_LOCALE) {
-		copy = duplocale(copy);
+	bool free_loc = false;
+	if (loc == LC_GLOBAL_LOCALE) {
+		loc = duplocale(loc);
+		free_loc = true;
 	}
 
-	if (copy != (locale_t)0) {
-		ret = strerror_l(errnum, copy);
-
-		if (loc == LC_GLOBAL_LOCALE) {
-			freelocale(copy);
+	if (loc != (locale_t)0) {
+		ret = strerror_l(errnum, loc);
+		if (free_loc) {
+			freelocale(loc);
 		}
 	}
+#elif BFS_HAS_STRERROR_R_POSIX
+	if (strerror_r(errnum, buf, sizeof(buf)) == 0) {
+		ret = buf;
+	}
+#elif BFS_HAS_STRERROR_R_GNU
+	ret = strerror_r(errnum, buf, sizeof(buf));
 #endif
 
 	if (!ret) {
-- 
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