xutils: Fix hashing an incomplete line with whitespaces at the end

Upon seeing a whitespace, xdl_hash_record_with_whitespace() first skipped
the run of whitespaces (excluding LF) that begins there, ensuring that the
pointer points at the last whitespace character in the run, and assumed
that the next character must be LF at the end of the line.  This does not
work when hashing an incomplete line, which lacks the LF at the end.

Introduce "at_eol" variable that is true when either we are at the end of
line (looking at LF) or at the end of an incomplete line, and use that
instead throughout the code.

Noticed by Thell Fowler.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/xdiff/xutils.c b/xdiff/xutils.c
index 04ad468702209b77427e635370d41001986042ce..9411fa96a142d0db73a089da83b464b4197f9331 100644 (file)
--- a/xdiff/xutils.c
+++ b/xdiff/xutils.c
@@ -242,18 +242,20 @@ static unsigned long xdl_hash_record_with_whitespace(char const **data,
        for (; ptr < top && *ptr != '\n'; ptr++) {
                if (isspace(*ptr)) {
                        const char *ptr2 = ptr;
+                       int at_eol;
                        while (ptr + 1 < top && isspace(ptr[1])
                                        && ptr[1] != '\n')
                                ptr++;
+                       at_eol = (top <= ptr + 1 || ptr[1] == '\n');
                        if (flags & XDF_IGNORE_WHITESPACE)
                                ; /* already handled */
                        else if (flags & XDF_IGNORE_WHITESPACE_CHANGE
-                                       && ptr[1] != '\n') {
+                                && !at_eol) {
                                ha += (ha << 5);
                                ha ^= (unsigned long) ' ';
                        }
                        else if (flags & XDF_IGNORE_WHITESPACE_AT_EOL
-                                       && ptr[1] != '\n') {
+                                && !at_eol) {
                                while (ptr2 != ptr + 1) {
                                        ha += (ha << 5);
                                        ha ^= (unsigned long) *ptr2;