From 1d26b252f1128f7b31885811d7f481b6b7612bd7 Mon Sep 17 00:00:00 2001 From: Tay Ray Chuan Date: Thu, 7 Jul 2011 12:23:57 +0800 Subject: [PATCH] xdiff/xpatience: factor out fall-back-diff function This is in preparation for the histogram diff algorithm, which will also re-use much of the code to call the default Meyers diff algorithm. Signed-off-by: Tay Ray Chuan Signed-off-by: Junio C Hamano --- xdiff/xpatience.c | 27 ++------------------------- xdiff/xutils.c | 31 +++++++++++++++++++++++++++++++ xdiff/xutils.h | 2 ++ 3 files changed, 35 insertions(+), 25 deletions(-) diff --git a/xdiff/xpatience.c b/xdiff/xpatience.c index e42c16a80..fdd7d0263 100644 --- a/xdiff/xpatience.c +++ b/xdiff/xpatience.c @@ -287,34 +287,11 @@ static int walk_common_sequence(struct hashmap *map, struct entry *first, static int fall_back_to_classic_diff(struct hashmap *map, int line1, int count1, int line2, int count2) { - /* - * This probably does not work outside Git, since - * we have a very simple mmfile structure. - * - * Note: ideally, we would reuse the prepared environment, but - * the libxdiff interface does not (yet) allow for diffing only - * ranges of lines instead of the whole files. - */ - mmfile_t subfile1, subfile2; xpparam_t xpp; - xdfenv_t env; - - subfile1.ptr = (char *)map->env->xdf1.recs[line1 - 1]->ptr; - subfile1.size = map->env->xdf1.recs[line1 + count1 - 2]->ptr + - map->env->xdf1.recs[line1 + count1 - 2]->size - subfile1.ptr; - subfile2.ptr = (char *)map->env->xdf2.recs[line2 - 1]->ptr; - subfile2.size = map->env->xdf2.recs[line2 + count2 - 2]->ptr + - map->env->xdf2.recs[line2 + count2 - 2]->size - subfile2.ptr; xpp.flags = map->xpp->flags & ~XDF_PATIENCE_DIFF; - if (xdl_do_diff(&subfile1, &subfile2, &xpp, &env) < 0) - return -1; - memcpy(map->env->xdf1.rchg + line1 - 1, env.xdf1.rchg, count1); - memcpy(map->env->xdf2.rchg + line2 - 1, env.xdf2.rchg, count2); - - xdl_free_env(&env); - - return 0; + return xdl_fall_back_diff(map->env, &xpp, + line1, count1, line2, count2); } /* diff --git a/xdiff/xutils.c b/xdiff/xutils.c index ab6503460..ded7c327d 100644 --- a/xdiff/xutils.c +++ b/xdiff/xutils.c @@ -402,3 +402,34 @@ int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2, return 0; } + +int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp, + int line1, int count1, int line2, int count2) +{ + /* + * This probably does not work outside Git, since + * we have a very simple mmfile structure. + * + * Note: ideally, we would reuse the prepared environment, but + * the libxdiff interface does not (yet) allow for diffing only + * ranges of lines instead of the whole files. + */ + mmfile_t subfile1, subfile2; + xdfenv_t env; + + subfile1.ptr = (char *)diff_env->xdf1.recs[line1 - 1]->ptr; + subfile1.size = diff_env->xdf1.recs[line1 + count1 - 2]->ptr + + diff_env->xdf1.recs[line1 + count1 - 2]->size - subfile1.ptr; + subfile2.ptr = (char *)diff_env->xdf2.recs[line2 - 1]->ptr; + subfile2.size = diff_env->xdf2.recs[line2 + count2 - 2]->ptr + + diff_env->xdf2.recs[line2 + count2 - 2]->size - subfile2.ptr; + if (xdl_do_diff(&subfile1, &subfile2, xpp, &env) < 0) + return -1; + + memcpy(diff_env->xdf1.rchg + line1 - 1, env.xdf1.rchg, count1); + memcpy(diff_env->xdf2.rchg + line2 - 1, env.xdf2.rchg, count2); + + xdl_free_env(&env); + + return 0; +} diff --git a/xdiff/xutils.h b/xdiff/xutils.h index d5de8292e..674a657b0 100644 --- a/xdiff/xutils.h +++ b/xdiff/xutils.h @@ -41,6 +41,8 @@ int xdl_num_out(char *out, long val); long xdl_atol(char const *str, char const **next); int xdl_emit_hunk_hdr(long s1, long c1, long s2, long c2, const char *func, long funclen, xdemitcb_t *ecb); +int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp, + int line1, int count1, int line2, int count2); -- 2.30.2