Fix compiler warning (git_off_t cast to size_t).

Use size_t for page size, instead of long. Check result of sysconf.
Use size_t for page offset so no cast to size_t (second arg to p_mmap).
Use mod instead div/mult pair, so no cast to size_t is necessary.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/unix/map.c b/src/unix/map.c
index 3d0cbbaf8..0a235d5a1 100644
--- a/src/unix/map.c
+++ b/src/unix/map.c
@@ -13,9 +13,15 @@
 #include <unistd.h>
 #include <errno.h>
 
-long git__page_size(void)
+int git__page_size(size_t *page_size)
 {
-	return sysconf(_SC_PAGE_SIZE);
+	long sc_page_size = sysconf(_SC_PAGE_SIZE);
+	if (sc_page_size < 0) {
+		giterr_set_str(GITERR_OS, "Can't determine system page size");
+		return -1;
+	}
+	*page_size = (size_t) sc_page_size;
+	return 0;
 }
 
 int p_mmap(git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)