From 05b343edd8581d797522051f1e903063429d6601 Mon Sep 17 00:00:00 2001
From: Kartik Naik <kartik@bugqore.com>
Date: Mon, 10 Aug 2026 18:13:42 +0530
Subject: merge the ftruncate shim into posix_win.c

ftruncate was the only fd shim that passed its descriptor to the CRT
without stripping the posix_open() tag bit, so _chsize() rejected the
negative fd with EBADF and the truncation failed. Move the shim into
posix_win.c so it can use get_real_fd() like fstat, close, read and
write, and drop the build glue for the separate ftruncate.c.
---
 crypto/CMakeLists.txt     |  4 ----
 crypto/Makefile.am        |  4 ----
 crypto/compat/ftruncate.c | 17 -----------------
 crypto/compat/posix_win.c |  8 ++++++++
 m4/check-libc.m4          |  1 -
 5 files changed, 8 insertions(+), 26 deletions(-)
 delete mode 100644 crypto/compat/ftruncate.c

diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index 491b9b4..0698ab4 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -637,10 +637,6 @@ if(NOT HAVE_FREEZERO)
 	set(COMPAT_SRC ${COMPAT_SRC} compat/freezero.c)
 endif()
 
-if(NOT HAVE_FTRUNCATE)
-	set(COMPAT_SRC ${COMPAT_SRC} compat/ftruncate.c)
-endif()
-
 if(NOT HAVE_GETDELIM)
 	set(COMPAT_SRC ${COMPAT_SRC} compat/getdelim.c)
 endif()
diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index f703e33..7969aee 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -148,10 +148,6 @@ if !HAVE_FREEZERO
 libcompat_la_SOURCES += compat/freezero.c
 endif
 
-if !HAVE_FTRUNCATE
-libcompat_la_SOURCES += compat/ftruncate.c
-endif
-
 if !HAVE_GETDELIM
 libcompat_la_SOURCES += compat/getdelim.c
 endif
diff --git a/crypto/compat/ftruncate.c b/crypto/compat/ftruncate.c
deleted file mode 100644
index e825e50..0000000
--- a/crypto/compat/ftruncate.c
+++ /dev/null
@@ -1,17 +0,0 @@
-/*
- * Public domain
- *
- * Kinichiro Inoguchi <inoguchi@openbsd.org>
- */
-
-#ifdef _WIN32
-
-#include <unistd.h>
-
-int
-ftruncate(int fd, off_t length)
-{
-	return _chsize(fd, length);
-}
-
-#endif
diff --git a/crypto/compat/posix_win.c b/crypto/compat/posix_win.c
index 4e98643..60b2896 100644
--- a/crypto/compat/posix_win.c
+++ b/crypto/compat/posix_win.c
@@ -68,6 +68,14 @@ libressl_fstat(int fd, struct stat *statbuf)
 	return fstat(get_real_fd(fd), statbuf);
 }
 
+#ifndef HAVE_FTRUNCATE
+int
+ftruncate(int fd, off_t length)
+{
+	return _chsize(get_real_fd(fd), length);
+}
+#endif
+
 int
 posix_open(const char *path, ...)
 {
diff --git a/m4/check-libc.m4 b/m4/check-libc.m4
index 42867cc..8ecc89a 100644
--- a/m4/check-libc.m4
+++ b/m4/check-libc.m4
@@ -39,7 +39,6 @@ AC_CACHE_CHECK([for getpagesize], ac_cv_func_getpagesize, [
 ])
 AM_CONDITIONAL([HAVE_ASPRINTF], [test "x$ac_cv_func_asprintf" = xyes])
 AM_CONDITIONAL([HAVE_FREEZERO], [test "x$ac_cv_func_freezero" = xyes])
-AM_CONDITIONAL([HAVE_FTRUNCATE], [test "x$ac_cv_func_ftruncate" = xyes])
 AM_CONDITIONAL([HAVE_GETDELIM], [test "x$ac_cv_func_getdelim" = xyes])
 AM_CONDITIONAL([HAVE_GETLINE], [test "x$ac_cv_func_getline" = xyes])
 AM_CONDITIONAL([HAVE_GETPAGESIZE], [test "x$ac_cv_func_getpagesize" = xyes])
-- 
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