Reimplement another handy convenience function from glibc. memrchr()
searches from the end of a memory area for a particular character. It
is similar to strrchr() but takes a length argument and is
binary-safe.
The whole-directory rename detection patch could use this to find the
last directory separator in a (possibly truncated) pathname.
Signed-off-by: Jonathan Nieder <jrnieder@xxxxxxxxx>
---
Yann Dirson wrote:
> * memrchr() implementation for portability
Something like this? Untested.
git-compat-util.h | 16 ++++++++++++++++
1 files changed, 16 insertions(+), 0 deletions(-)
diff --git a/git-compat-util.h b/git-compat-util.h
index 2af8d3e..6f1020e 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -366,6 +366,9 @@ extern int git_vsnprintf(char *str, size_t maxsize,
#define HAVE_STRCHRNUL
#define HAVE_MEMPCPY
#endif
+#if __GLIBC_PREREQ(2, 2)
+#define HAVE_MEMRCHR
+#endif
#endif
#ifndef HAVE_STRCHRNUL
@@ -386,6 +389,19 @@ static inline void *gitmempcpy(void *dest, const void *src, size_t n)
}
#endif
+#ifndef HAVE_MEMRCHR
+#define memrchr gitmemrchr
+static inline void *gitmemrchr(const void *s, int c, size_t n)
+{
+ const char *p = s;
+ p += n;
+ while (p != s)
+ if (*--p == c)
+ return p;
+ return NULL;
+}
+#endif
+
extern void release_pack_memory(size_t, int);
typedef void (*try_to_free_t)(size_t);
--
1.7.2.3
--
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