---
mingw-w64-crt/testcases/Makefile.am | 1 +
mingw-w64-crt/testcases/t_lseeki64.c | 40 ++++++++++++++++++++++++++++
2 files changed, 41 insertions(+)
create mode 100644 mingw-w64-crt/testcases/t_lseeki64.c
diff --git a/mingw-w64-crt/testcases/Makefile.am
b/mingw-w64-crt/testcases/Makefile.am
index 889439141918..7263b124fe00 100644
--- a/mingw-w64-crt/testcases/Makefile.am
+++ b/mingw-w64-crt/testcases/Makefile.am
@@ -28,6 +28,7 @@ testcase_progs = \
t_intrinc \
t_imagebase \
t_lfs \
+ t_lseeki64 \
t_matherr \
t_mbrlen \
t_mbrtowc \
diff --git a/mingw-w64-crt/testcases/t_lseeki64.c
b/mingw-w64-crt/testcases/t_lseeki64.c
new file mode 100644
index 000000000000..682e1add205f
--- /dev/null
+++ b/mingw-w64-crt/testcases/t_lseeki64.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <assert.h>
+#include <io.h>
+
+int main() {
+ FILE *file;
+ int fd;
+
+ /* create temporary file which is automatically deleted when process
terminates */
+ file = tmpfile();
+ assert(file);
+ fd = fileno(file);
+ assert(fd >= 0);
+
+ /* absolute offset which fits into 32-bit signed type */
+ assert(_lseeki64(fd, 0x10, SEEK_SET) == 0x10);
+ assert(_lseeki64(fd, 0, SEEK_CUR) == 0x10);
+
+ /* relative offset which fits into 32-bit signed type, but absolute does
not */
+ assert(_lseeki64(fd, 0x7FFFFFFF, SEEK_CUR) == 0x7FFFFFFFLL + 0x10);
+ assert(_lseeki64(fd, 0, SEEK_CUR) == 0x7FFFFFFFLL + 0x10);
+
+ /* absolute offset which fits into 32-bit unsigned type but does not into
32-bit signed type */
+ assert(_lseeki64(fd, 0x90000000, SEEK_SET) == 0x90000000);
+ assert(_lseeki64(fd, 0, SEEK_CUR) == 0x90000000);
+
+ /* relative offset which fits into 32-bit unsigned type but absolute does
not */
+ assert(_lseeki64(fd, 0xFFFFFFFF, SEEK_CUR) == 0xFFFFFFFFLL + 0x90000000);
+ assert(_lseeki64(fd, 0, SEEK_CUR) == 0xFFFFFFFFLL + 0x90000000);
+
+ /* absolute offset which does not fit into 32-bit unsigned type */
+ assert(_lseeki64(fd, 0x100000000, SEEK_SET) == 0x100000000);
+ assert(_lseeki64(fd, 0, SEEK_CUR) == 0x100000000);
+
+ /* relative offset which does not fit into 32-bit unsigned type */
+ assert(_lseeki64(fd, 0x100000000, SEEK_CUR) == 0x200000000);
+ assert(_lseeki64(fd, 0, SEEK_CUR) == 0x200000000);
+
+ return 0;
+}
--
2.20.1
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