resolve_ref(): turn buffer into a proper string as soon as possible

Immediately strip off trailing spaces and null-terminate the string
holding the contents of the reference file; this allows the use of
string functions and avoids the need to keep separate track of the
string's length.  (get_sha1_hex() fails automatically if the string is
too short.)

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/refs.c b/refs.c
index 8f0b87184b1e2c17ad76329f47f96961d76fe003..79ab0eb95f8998b75246bfbc475e374298649f29 100644 (file)
--- a/refs.c
+++ b/refs.c
@@ -546,25 +546,25 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *
                        return NULL;
                len = read_in_full(fd, buffer, sizeof(buffer)-1);
                close(fd);
+               if (len < 0)
+                       return NULL;
+               while (len && isspace(buffer[len-1]))
+                       len--;
+               buffer[len] = '\0';
 
                /*
                 * Is it a symbolic ref?
                 */
-               if (len < 4 || memcmp("ref:", buffer, 4))
+               if (prefixcmp(buffer, "ref:"))
                        break;
                buf = buffer + 4;
-               len -= 4;
-               while (len && isspace(*buf))
-                       buf++, len--;
-               while (len && isspace(buf[len-1]))
-                       len--;
-               buf[len] = 0;
-               memcpy(ref_buffer, buf, len + 1);
-               ref = ref_buffer;
+               while (isspace(*buf))
+                       buf++;
+               ref = strcpy(ref_buffer, buf);
                if (flag)
                        *flag |= REF_ISSYMREF;
        }
-       if (len < 40 || get_sha1_hex(buffer, sha1))
+       if (get_sha1_hex(buffer, sha1))
                return NULL;
        return ref;
 }