[PATCHv2 1/2] Make xdi_diff_outf interface for running xdiff_outf diffs

[Brian Downing <bdowning@lavos.net>]

To prepare for the need to initialize and release resources for an
xdi_diff with the xdiff_outf output function, make a new function to
wrap this usage.

Old:

	ecb.outf = xdiff_outf;
	ecb.priv = &state;
	...
	xdi_diff(file_p, file_o, &xpp, &xecfg, &ecb);

New:

	xdi_diff_outf(file_p, file_o, &state.xm, &xpp, &xecfg, &ecb);

Signed-off-by: Brian Downing <bdowning@lavos.net>
---

    Let's try this instead; it's quite a bit cleaner than my last
    effort.

 builtin-blame.c   |    4 +---
 combine-diff.c    |    5 ++---
 diff.c            |   20 +++++---------------
 xdiff-interface.c |   13 ++++++++++++-
 xdiff-interface.h |    4 +++-
 5 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/builtin-blame.c b/builtin-blame.c
index 4ea3431..8cca3b1 100644
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -528,15 +528,13 @@ static struct patch *compare_buffer(mmfile_t *file_p, mmfile_t *file_o,
 	xpp.flags = xdl_opts;
 	memset(&xecfg, 0, sizeof(xecfg));
 	xecfg.ctxlen = context;
-	ecb.outf = xdiff_outf;
-	ecb.priv = &state;
 	memset(&state, 0, sizeof(state));
 	state.xm.consume = process_u_diff;
 	state.ret = xmalloc(sizeof(struct patch));
 	state.ret->chunks = NULL;
 	state.ret->num = 0;
 
-	xdi_diff(file_p, file_o, &xpp, &xecfg, &ecb);
+	xdi_diff_outf(file_p, file_o, &state.xm, &xpp, &xecfg, &ecb);
 
 	if (state.ret->num) {
 		struct chunk *chunk;
diff --git a/combine-diff.c b/combine-diff.c
index 9f80a1c..72dd6d2 100644
--- a/combine-diff.c
+++ b/combine-diff.c
@@ -217,8 +217,6 @@ static void combine_diff(const unsigned char *parent, mmfile_t *result_file,
 	parent_file.size = sz;
 	xpp.flags = XDF_NEED_MINIMAL;
 	memset(&xecfg, 0, sizeof(xecfg));
-	ecb.outf = xdiff_outf;
-	ecb.priv = &state;
 	memset(&state, 0, sizeof(state));
 	state.xm.consume = consume_line;
 	state.nmask = nmask;
@@ -227,7 +225,8 @@ static void combine_diff(const unsigned char *parent, mmfile_t *result_file,
 	state.num_parent = num_parent;
 	state.n = n;
 
-	xdi_diff(&parent_file, result_file, &xpp, &xecfg, &ecb);
+	xdi_diff_outf(&parent_file, result_file,
+		      &state.xm, &xpp, &xecfg, &ecb);
 	free(parent_file.ptr);
 
 	/* Assign line numbers for this parent.
diff --git a/diff.c b/diff.c
index bf5d5f1..913a92f 100644
--- a/diff.c
+++ b/diff.c
@@ -459,10 +459,8 @@ static void diff_words_show(struct diff_words_data *diff_words)
 
 	xpp.flags = XDF_NEED_MINIMAL;
 	xecfg.ctxlen = diff_words->minus.alloc + diff_words->plus.alloc;
-	ecb.outf = xdiff_outf;
-	ecb.priv = diff_words;
 	diff_words->xm.consume = fn_out_diff_words_aux;
-	xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
+	xdi_diff_outf(&minus, &plus, &diff_words->xm, &xpp, &xecfg, &ecb);
 
 	free(minus.ptr);
 	free(plus.ptr);
@@ -1521,15 +1519,13 @@ static void builtin_diff(const char *name_a,
 			xecfg.ctxlen = strtoul(diffopts + 10, NULL, 10);
 		else if (!prefixcmp(diffopts, "-u"))
 			xecfg.ctxlen = strtoul(diffopts + 2, NULL, 10);
-		ecb.outf = xdiff_outf;
-		ecb.priv = &ecbdata;
 		ecbdata.xm.consume = fn_out_consume;
 		if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS)) {
 			ecbdata.diff_words =
 				xcalloc(1, sizeof(struct diff_words_data));
 			ecbdata.diff_words->file = o->file;
 		}
-		xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
+		xdi_diff_outf(&mf1, &mf2, &ecbdata.xm, &xpp, &xecfg, &ecb);
 		if (DIFF_OPT_TST(o, COLOR_DIFF_WORDS))
 			free_diff_words_data(&ecbdata);
 	}
@@ -1580,9 +1576,7 @@ static void builtin_diffstat(const char *name_a, const char *name_b,
 
 		memset(&xecfg, 0, sizeof(xecfg));
 		xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
-		ecb.outf = xdiff_outf;
-		ecb.priv = diffstat;
-		xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
+		xdi_diff_outf(&mf1, &mf2, &diffstat->xm, &xpp, &xecfg, &ecb);
 	}
 
  free_and_return:
@@ -1628,9 +1622,7 @@ static void builtin_checkdiff(const char *name_a, const char *name_b,
 
 		memset(&xecfg, 0, sizeof(xecfg));
 		xpp.flags = XDF_NEED_MINIMAL;
-		ecb.outf = xdiff_outf;
-		ecb.priv = &data;
-		xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
+		xdi_diff_outf(&mf1, &mf2, &data.xm, &xpp, &xecfg, &ecb);
 
 		if ((data.ws_rule & WS_TRAILING_SPACE) &&
 		    data.trailing_blanks_start) {
@@ -3128,9 +3120,7 @@ static int diff_get_patch_id(struct diff_options *options, unsigned char *sha1)
 		xpp.flags = XDF_NEED_MINIMAL;
 		xecfg.ctxlen = 3;
 		xecfg.flags = XDL_EMIT_FUNCNAMES;
-		ecb.outf = xdiff_outf;
-		ecb.priv = &data;
-		xdi_diff(&mf1, &mf2, &xpp, &xecfg, &ecb);
+		xdi_diff_outf(&mf1, &mf2, &data.xm, &xpp, &xecfg, &ecb);
 	}
 
 	SHA1_Final(sha1, &ctx);
diff --git a/xdiff-interface.c b/xdiff-interface.c
index 61dc5c5..be448a0 100644
--- a/xdiff-interface.c
+++ b/xdiff-interface.c
@@ -61,7 +61,7 @@ static void consume_one(void *priv_, char *s, unsigned long size)
 	}
 }
 
-int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
+static int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf)
 {
 	struct xdiff_emit_state *priv = priv_;
 	int i;
@@ -141,6 +141,17 @@ int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t co
 	return xdl_diff(&a, &b, xpp, xecfg, xecb);
 }
 
+int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
+		  struct xdiff_emit_state *state, xpparam_t const *xpp,
+		  xdemitconf_t const *xecfg, xdemitcb_t *xecb)
+{
+	int ret;
+	xecb->outf = xdiff_outf;
+	xecb->priv = state;
+	ret = xdl_diff(mf1, mf2, xpp, xecfg, xecb);
+	return ret;
+}
+
 int read_mmfile(mmfile_t *ptr, const char *filename)
 {
 	struct stat st;
diff --git a/xdiff-interface.h b/xdiff-interface.h
index f7f791d..6f3b361 100644
--- a/xdiff-interface.h
+++ b/xdiff-interface.h
@@ -14,7 +14,9 @@ struct xdiff_emit_state {
 };
 
 int xdi_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp, xdemitconf_t const *xecfg, xdemitcb_t *ecb);
-int xdiff_outf(void *priv_, mmbuffer_t *mb, int nbuf);
+int xdi_diff_outf(mmfile_t *mf1, mmfile_t *mf2,
+		  struct xdiff_emit_state *state, xpparam_t const *xpp,
+		  xdemitconf_t const *xecfg, xdemitcb_t *xecb);
 int parse_hunk_header(char *line, int len,
 		      int *ob, int *on,
 		      int *nb, int *nn);
-- 
1.5.6.1