add_file_to_index: skip rehashing if the cached stat already matches

diff --git a/sha1_file.c b/sha1_file.c
index 1efd9ae19a84dbc2765d4011ea06b2145e86ebb3..aca741b79ce3cdc28f0eb5bdc6848ddba6da8f35 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -2304,27 +2304,36 @@ int has_sha1_file(const unsigned char *sha1)
  *
  * returns 0 if anything went fine and -1 otherwise
  *
+ * The buffer is always NUL-terminated, not including it in returned size.
+ *
  * NOTE: both buf and size may change, but even when -1 is returned
  * you still have to free() it yourself.
  */
-int read_pipe(int fd, char** return_buf, unsigned long* return_size)
+int read_fd(int fd, char **return_buf, unsigned long *return_size)
 {
-       char* buf = *return_buf;
+       char *buf = *return_buf;
        unsigned long size = *return_size;
        ssize_t iret;
        unsigned long off = 0;
 
+       if (!buf || size <= 1) {
+               size = 1024;
+               buf = xrealloc(buf, size);
+       }
+
        do {
-               iret = xread(fd, buf + off, size - off);
+               iret = xread(fd, buf + off, (size - 1) - off);
                if (iret > 0) {
                        off += iret;
-                       if (off == size) {
-                               size *= 2;
+                       if (off == size - 1) {
+                               size = alloc_nr(size);
                                buf = xrealloc(buf, size);
                        }
                }
        } while (iret > 0);
 
+       buf[off] = '\0';
+
        *return_buf = buf;
        *return_size = off;
 
@@ -2339,7 +2348,7 @@ int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object)
        char *buf = xmalloc(size);
        int ret;
 
-       if (read_pipe(fd, &buf, &size)) {
+       if (read_fd(fd, &buf, &size)) {
                free(buf);
                return -1;
        }