crt: Fix POSIX stat() with 32-bit st_size for pre-msvcr100 build
For POSIX stat compatibility, it is not possible to use msvcrt _stat32() or
_stat64i32() from crtdll.dll - msvcr100.dll CRT libraries as their
implementations do not signal EOVERFLOW error when file size does not fit
into the stat's st_size field. Signalling EOVERFLOW is required for POSIX
compatibility. New CRT libraries (msvcr110.dll, msvcr120.dll and UCRT) have
implementation of _stat32() and _stat64i32() more compatible with POSIX and
properly return EOVERFLOW when file size does not fit into the struct
stat's st_size field.
So for pre-msvcr110 builds, use only _stat64() function for implementing
POSIX stat in mingw-w64 and do check overflow in mingw-w64 the wrapper.
Signed-off-by: Martin Storsjö <martin@martin.st>
diff --git a/mingw-w64-crt/stdio/msvcr110pre_stat64i32.c b/mingw-w64-crt/stdio/msvcr110pre_stat64i32.c
new file mode 100644
index 0000000..e3311f2
--- /dev/null
+++ b/mingw-w64-crt/stdio/msvcr110pre_stat64i32.c
@@ -0,0 +1,54 @@
+/**
+ * This file has no copyright assigned and is placed in the Public Domain.
+ * This file is part of the mingw-w64 runtime package.
+ * No warranty is given; refer to the file DISCLAIMER.PD within this package.
+ */
+
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <errno.h>
+
+char *__mingw_fix_stat_path(const char *_path);
+
+/* For pre-msvcr110 builds, we cannot use _stat64i32() function as it does
+ * not signal EOVERFLOW when file size does not fit into the st_size field,
+ * as it is required by POSIX stat() function.
+ * This file is used only for pre-msvcr110 builds.
+ */
+int __cdecl stat64i32(const char *_Filename, struct _stat64i32 *_Stat);
+int __cdecl stat64i32(const char *_Filename, struct _stat64i32 *_Stat)
+{
+ struct _stat64 st;
+ char *_path = __mingw_fix_stat_path(_Filename);
+ int ret = _stat64(_path, &st);
+ if (_path != _Filename)
+ free(_path);
+ if (ret != 0)
+ return ret;
+ if (st.st_size > UINT32_MAX) {
+ errno = EOVERFLOW;
+ return -1;
+ }
+ _Stat->st_dev=st.st_dev;
+ _Stat->st_ino=st.st_ino;
+ _Stat->st_mode=st.st_mode;
+ _Stat->st_nlink=st.st_nlink;
+ _Stat->st_uid=st.st_uid;
+ _Stat->st_gid=st.st_gid;
+ _Stat->st_rdev=st.st_rdev;
+ _Stat->st_size=(_off_t) st.st_size;
+ _Stat->st_atime=st.st_atime;
+ _Stat->st_mtime=st.st_mtime;
+ _Stat->st_ctime=st.st_ctime;
+ return 0;
+}
+int (__cdecl *__MINGW_IMP_SYMBOL(stat64i32))(const char *, struct _stat64i32 *) = stat64i32;
+
+/* On 64-bit systems is stat() function ABI compatible with stat64i32() function */
+#ifdef _WIN64
+#undef stat
+struct stat;
+int __attribute__ ((alias ("stat64i32"))) __cdecl stat(const char *name, struct stat *stat);
+extern int __attribute__ ((alias (__MINGW64_STRINGIFY(__MINGW_IMP_SYMBOL(stat64i32))))) (__cdecl *__MINGW_IMP_SYMBOL(stat))(const char *name, struct stat *stat);
+#endif
