[PATCH v2025.09.y 31/49] scripts: imx: add pread implementation for mingw target

[Ahmad Fatoum]

From: Maud Spierings <maudspierings at gocontroll.com>

Add a simple pread implementation for the mingw target so imx-usb-loader
can be compiled for windows.

This function is actually only called by bareboxtlv, which I don't think
targets being compiled for windows, so it is a bit of a dead weight.

Signed-off-by: Maud Spierings <maudspierings at gocontroll.com>
Reviewed-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
Link: https://lore.barebox.org/20251201-imx_usb-v2-2-95ec2a0e8694@gocontroll.com
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
(cherry picked from commit 969c9b94b58de50ab0db2eeef0a4dcfad4f5da5c)
Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
 scripts/imx/Makefile.mingw64 |  2 +-
 scripts/imx/pread.c          | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 scripts/imx/pread.c

diff --git a/scripts/imx/Makefile.mingw64 b/scripts/imx/Makefile.mingw64
index 101b39e9178d..a7be48ae5333 100644
--- a/scripts/imx/Makefile.mingw64
+++ b/scripts/imx/Makefile.mingw64
@@ -33,7 +33,7 @@ obj := $(realpath $(obj))
 CPPFLAGS := -I $(LIBUSB_MINGW)/include/libusb-1.0 -I $(src)/../include/ -I $(src)/../../include/mach/ -include $(src)/../include/defines.h
 LDFLAGS := -L $(LIBUSB_MINGW)/lib -lusb-1.0 -static
 
-OBJECTS := $(addprefix $(obj)/, imx.o imx-usb-loader.o)
+OBJECTS := $(addprefix $(obj)/, imx.o imx-usb-loader.o pread.o)
 
 $(obj)/%.o: $(src)/%.c
 	@$(CC) -c -o $@ $< $(CPPFLAGS)
diff --git a/scripts/imx/pread.c b/scripts/imx/pread.c
new file mode 100644
index 000000000000..febb6f32432c
--- /dev/null
+++ b/scripts/imx/pread.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-FileCopyrightText: 2025 Maud Spierings, GOcontroll B.V.
+
+#include <stdint.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+ssize_t pread(int fd, void *buf, size_t count, off_t offset)
+{
+	int offset_start, now;
+
+	offset_start = lseek(fd, 0, SEEK_CUR);
+	if (offset_start < 0)
+		return offset_start;
+
+	now = lseek(fd, offset, SEEK_SET);
+	if (now < 0)
+		return now;
+
+	now = read(fd, buf, count);
+
+	lseek(fd, offset_start, SEEK_SET);
+
+	return now;
+}
-- 
2.47.3