win32: override `fspathcmp()` with a directory separator-aware version

On Windows, the backslash is the directory separator, even if the
forward slash can be used, too, at least since Windows NT.

This means that the paths `a/b` and `a\b` are equivalent, and
`fspathcmp()` needs to be made aware of that fact.

Note that we have to override both `fspathcmp()` and `fspathncmp()`, and
the former cannot be a mere pre-processor constant that transforms calls
to `fspathcmp(a, b)` into `fspathncmp(a, b, (size_t)-1)` because the
function `report_collided_checkout()` in `unpack-trees.c` wants to
assign `list.cmp = fspathcmp`.

Also note that `fspatheq()` does _not_ need to be overridden because it
calls `fspathcmp()` internally.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/compat/win32/path-utils.h b/compat/win32/path-utils.h
index 65fa3b9263..a561c700e7 100644
--- a/compat/win32/path-utils.h
+++ b/compat/win32/path-utils.h
@@ -29,5 +29,9 @@ static inline int win32_has_dir_sep(const char *path)
 #define has_dir_sep(path) win32_has_dir_sep(path)
 int win32_offset_1st_component(const char *path);
 #define offset_1st_component win32_offset_1st_component
+int win32_fspathcmp(const char *a, const char *b);
+#define fspathcmp win32_fspathcmp
+int win32_fspathncmp(const char *a, const char *b, size_t count);
+#define fspathncmp win32_fspathncmp
 
 #endif