diff --cc: integer overflow given a 2GB-or-larger file

[git.git] / git-compat-util.h

diff --git a/git-compat-util.h b/git-compat-util.h
index f243b86d3296579a130220ba5cde74ec954f429d..9863cf671f7522f73ea5a88af0d1234488c73396 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -15,8 +15,9 @@
 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 #endif
-#define _GNU_SOURCE
-#define _BSD_SOURCE
+#define _ALL_SOURCE 1
+#define _GNU_SOURCE 1
+#define _BSD_SOURCE 1
 
 #include <unistd.h>
 #include <stdio.h>
@@ -45,7 +46,10 @@
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <pwd.h>
+#include <inttypes.h>
+#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 #include <grp.h>
+#define _ALL_SOURCE 1
 
 #ifndef NO_ICONV
 #include <iconv.h>
@@ -92,16 +96,28 @@ extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 extern int git_munmap(void *start, size_t length);
 
+/* This value must be multiple of (pagesize * 2) */
 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 
 #else /* NO_MMAP */
 
 #include <sys/mman.h>
-#define DEFAULT_PACKED_GIT_WINDOW_SIZE (32 * 1024 * 1024)
+
+/* This value must be multiple of (pagesize * 2) */
+#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
+       (sizeof(void*) >= 8 \
+               ?  1 * 1024 * 1024 * 1024 \
+               : 32 * 1024 * 1024)
 
 #endif /* NO_MMAP */
 
-#define DEFAULT_PACKED_GIT_LIMIT (256 * 1024 * 1024)
+#define DEFAULT_PACKED_GIT_LIMIT \
+       ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
+
+#ifdef NO_PREAD
+#define pread git_pread
+extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
+#endif
 
 #ifdef NO_SETENV
 #define setenv gitsetenv
@@ -123,6 +139,11 @@ extern char *gitstrcasestr(const char *haystack, const char *needle);
 extern size_t gitstrlcpy(char *, const char *, size_t);
 #endif
 
+#ifdef NO_STRTOUMAX
+#define strtoumax gitstrtoumax
+extern uintmax_t gitstrtoumax(const char *, char **, int);
+#endif
+
 extern void release_pack_memory(size_t);
 
 static inline char* xstrdup(const char *str)
@@ -193,6 +214,8 @@ static inline void *xmmap(void *start, size_t length,
 {
        void *ret = mmap(start, length, prot, flags, fd, offset);
        if (ret == MAP_FAILED) {
+               if (!length)
+                       return NULL;
                release_pack_memory(length);
                ret = mmap(start, length, prot, flags, fd, offset);
                if (ret == MAP_FAILED)