merge-recursive: fix parsing of "diff-algorithm" option
The "diff-algorithm" option to the recursive merge strategy takes the
name of the algorithm as an option, but it uses strcmp on the option
string to check if it starts with "diff-algorithm=", meaning that this
options cannot actually be used.
Fix this by switching to prefixcmp. At the same time, clarify the
following line by using strlen instead of a hard-coded length, which
also makes it consistent with nearby code.
Reported-by: Luke Noel-Storr <luke.noel-storr@integrate.co.uk>
Signed-off-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
diff --git a/merge-recursive.c b/merge-recursive.c
index ea9dbd3..1cd511b 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -2068,8 +2068,8 @@
o->xdl_opts = DIFF_WITH_ALG(o, PATIENCE_DIFF);
else if (!strcmp(s, "histogram"))
o->xdl_opts = DIFF_WITH_ALG(o, HISTOGRAM_DIFF);
- else if (!strcmp(s, "diff-algorithm=")) {
- long value = parse_algorithm_value(s+15);
+ else if (!prefixcmp(s, "diff-algorithm=")) {
+ long value = parse_algorithm_value(s + strlen("diff-algorithm="));
if (value < 0)
return -1;
/* clear out previous settings */
