Re: [PATCH v2 1/1] xdiff: provide indirection to git functions

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On 17/02/2022 22:54, Edward Thomson wrote:
Provide an indirection layer into the git-specific functionality and
utilities in `git-xdiff.h`, prefixing those types and functions with
`xdl_` (and `XDL_` for macros).  This allows other projects that use
git's xdiff implementation to keep up-to-date; they can now take all the
files _except_ `git-xdiff.h`, which they have customized for their own
environment.

The changes since V1 look good,

Best Wishes

Phillip

Signed-off-by: Edward Thomson <ethomson@xxxxxxxxxxxxxxxxx>
---
  xdiff/git-xdiff.h | 16 ++++++++++++++++
  xdiff/xdiff.h     |  8 +++-----
  xdiff/xdiffi.c    | 20 ++++++++++----------
  xdiff/xinclude.h  |  2 +-
  xdiff/xmerge.c    |  4 ++--
  5 files changed, 32 insertions(+), 18 deletions(-)
  create mode 100644 xdiff/git-xdiff.h

diff --git a/xdiff/git-xdiff.h b/xdiff/git-xdiff.h
new file mode 100644
index 0000000000..664a7c1351
--- /dev/null
+++ b/xdiff/git-xdiff.h
@@ -0,0 +1,16 @@
+#ifndef GIT_XDIFF_H
+#define GIT_XDIFF_H
+
+#include "git-compat-util.h"
+
+#define xdl_malloc(x) xmalloc(x)
+#define xdl_free(ptr) free(ptr)
+#define xdl_realloc(ptr,x) xrealloc(ptr,x)
+
+#define xdl_regex_t regex_t
+#define xdl_regmatch_t regmatch_t
+#define xdl_regexec_buf(p, b, s, n, m, f) regexec_buf(p, b, s, n, m, f)
+
+#define XDL_BUG(msg) BUG(msg)
+
+#endif
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index 72e25a9ffa..fb47f63fbf 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -27,6 +27,8 @@
  extern "C" {
  #endif /* #ifdef __cplusplus */

+#include "git-xdiff.h"
+
  /* xpparm_t.flags */
  #define XDF_NEED_MINIMAL (1 << 0)

@@ -82,7 +84,7 @@ typedef struct s_xpparam {
  	unsigned long flags;

  	/* -I<regex> */
-	regex_t **ignore_regex;
+	xdl_regex_t **ignore_regex;
  	size_t ignore_regex_nr;

  	/* See Documentation/diff-options.txt. */
@@ -119,10 +121,6 @@ typedef struct s_bdiffparam {
  } bdiffparam_t;


-#define xdl_malloc(x) xmalloc(x)
-#define xdl_free(ptr) free(ptr)
-#define xdl_realloc(ptr,x) xrealloc(ptr,x)
-
  void *xdl_mmfile_first(mmfile_t *mmf, long *size);
  long xdl_mmfile_size(mmfile_t *mmf);

diff --git a/xdiff/xdiffi.c b/xdiff/xdiffi.c
index 69689fab24..af31b7f4b3 100644
--- a/xdiff/xdiffi.c
+++ b/xdiff/xdiffi.c
@@ -832,7 +832,7 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
  			/* Shift the group backward as much as possible: */
  			while (!group_slide_up(xdf, &g))
  				if (group_previous(xdfo, &go))
-					BUG("group sync broken sliding up");
+					XDL_BUG("group sync broken sliding up");

  			/*
  			 * This is this highest that this group can be shifted.
@@ -848,7 +848,7 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
  				if (group_slide_down(xdf, &g))
  					break;
  				if (group_next(xdfo, &go))
-					BUG("group sync broken sliding down");
+					XDL_BUG("group sync broken sliding down");

  				if (go.end > go.start)
  					end_matching_other = g.end;
@@ -873,9 +873,9 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
  			 */
  			while (go.end == go.start) {
  				if (group_slide_up(xdf, &g))
-					BUG("match disappeared");
+					XDL_BUG("match disappeared");
  				if (group_previous(xdfo, &go))
-					BUG("group sync broken sliding to match");
+					XDL_BUG("group sync broken sliding to match");
  			}
  		} else if (flags & XDF_INDENT_HEURISTIC) {
  			/*
@@ -916,9 +916,9 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {

  			while (g.end > best_shift) {
  				if (group_slide_up(xdf, &g))
-					BUG("best shift unreached");
+					XDL_BUG("best shift unreached");
  				if (group_previous(xdfo, &go))
-					BUG("group sync broken sliding to blank line");
+					XDL_BUG("group sync broken sliding to blank line");
  			}
  		}

@@ -927,11 +927,11 @@ int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
  		if (group_next(xdf, &g))
  			break;
  		if (group_next(xdfo, &go))
-			BUG("group sync broken moving to next group");
+			XDL_BUG("group sync broken moving to next group");
  	}

  	if (!group_next(xdfo, &go))
-		BUG("group sync broken at end of file");
+		XDL_BUG("group sync broken at end of file");

  	return 0;
  }
@@ -1011,11 +1011,11 @@ static void xdl_mark_ignorable_lines(xdchange_t *xscr, xdfenv_t *xe, long flags)
  }

  static int record_matches_regex(xrecord_t *rec, xpparam_t const *xpp) {
-	regmatch_t regmatch;
+	xdl_regmatch_t regmatch;
  	int i;

  	for (i = 0; i < xpp->ignore_regex_nr; i++)
-		if (!regexec_buf(xpp->ignore_regex[i], rec->ptr, rec->size, 1,
+		if (!xdl_regexec_buf(xpp->ignore_regex[i], rec->ptr, rec->size, 1,
  				 &regmatch, 0))
  			return 1;

diff --git a/xdiff/xinclude.h b/xdiff/xinclude.h
index a4285ac0eb..75db1d8f35 100644
--- a/xdiff/xinclude.h
+++ b/xdiff/xinclude.h
@@ -23,7 +23,7 @@
  #if !defined(XINCLUDE_H)
  #define XINCLUDE_H

-#include "git-compat-util.h"
+#include "git-xdiff.h"
  #include "xmacros.h"
  #include "xdiff.h"
  #include "xtypes.h"
diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c
index fff0b594f9..433e2d7415 100644
--- a/xdiff/xmerge.c
+++ b/xdiff/xmerge.c
@@ -88,7 +88,7 @@ static int xdl_cleanup_merge(xdmerge_t *c)
  		if (c->mode == 0)
  			count++;
  		next_c = c->next;
-		free(c);
+		xdl_free(c);
  	}
  	return count;
  }
@@ -456,7 +456,7 @@ static void xdl_merge_two_conflicts(xdmerge_t *m)
  	m->chg1 = next_m->i1 + next_m->chg1 - m->i1;
  	m->chg2 = next_m->i2 + next_m->chg2 - m->i2;
  	m->next = next_m->next;
-	free(next_m);
+	xdl_free(next_m);
  }

  /*
--
2.35.1




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