int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
long s1, s2, e1, e2, lctx;
xdchange_t *xch, *xche;
long funclineprev = -1;
struct func_line func_line = { 0 };
if (xecfg->flags & XDL_EMIT_COMMON)
return xdl_emit_common(xe, xscr, ecb, xecfg);
for (xch = xscr; xch; xch = xche->next) {
xche = xdl_get_hunk(xch, xecfg);
s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
long fs1 = get_func_line(xe, xecfg, NULL, xch->i1, -1);
if (fs1 < 0)
fs1 = 0;
if (fs1 < s1) {
s2 -= s1 - fs1;
s1 = fs1;
}
}
again:
lctx = xecfg->ctxlen;
lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1));
lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2));
e1 = xche->i1 + xche->chg1 + lctx;
e2 = xche->i2 + xche->chg2 + lctx;
if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
long fe1 = get_func_line(xe, xecfg, NULL,
xche->i1 + xche->chg1,
xe->xdf1.nrec);
if (fe1 < 0)
fe1 = xe->xdf1.nrec;
if (fe1 > e1) {
e2 += fe1 - e1;
e1 = fe1;
}
/*
* Overlap with next change? Then include it
* in the current hunk and start over to find
* its new end.
*/
if (xche->next) {
long l = xche->next->i1;
if (l <= e1 ||
get_func_line(xe, xecfg, NULL, l, e1) < 0) {
xche = xche->next;
goto again;
}
}
}
/*
* Emit current hunk header.
*/
if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
get_func_line(xe, xecfg, &func_line,
s1 - 1, funclineprev);
funclineprev = s1 - 1;
}
if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
func_line.buf, func_line.len, ecb) < 0)
return -1;
/*
* Emit pre-context.
*/
for (; s2 < xch->i2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
for (s1 = xch->i1, s2 = xch->i2;; xch = xch->next) {
/*
* Merge previous with current change atom.
*/
for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
/*
* Removes lines from the first file.
*/
for (s1 = xch->i1; s1 < xch->i1 + xch->chg1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, "-", ecb) < 0)
return -1;
/*
* Adds lines from the second file.
*/
for (s2 = xch->i2; s2 < xch->i2 + xch->chg2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, "+", ecb) < 0)
return -1;
if (xch == xche)
break;
s1 = xch->i1 + xch->chg1;
s2 = xch->i2 + xch->chg2;
}
/*
* Emit post-context.
*/
for (s2 = xche->i2 + xche->chg2; s2 < e2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
return -1;
}
return 0;
}
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
long s1, s2, e1, e2, lctx;
xdchange_t *xch, *xche;
char funcbuf[80];
long funclen = 0;
find_func_t ff = xecfg->find_func ? xecfg->find_func : def_ff;
if (xecfg->flags & XDL_EMIT_COMMON)
return xdl_emit_common(xe, xscr, ecb, xecfg);
for (xch = xche = xscr; xch; xch = xche->next) {
xche = xdl_get_hunk(xch, xecfg);
s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
lctx = xecfg->ctxlen;
lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1));
lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2));
e1 = xche->i1 + xche->chg1 + lctx;
e2 = xche->i2 + xche->chg2 + lctx;
/*
* Emit current hunk header.
*/
if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
xdl_find_func(&xe->xdf1, s1, funcbuf,
sizeof(funcbuf), &funclen,
ff, xecfg->find_func_priv);
}
if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
funcbuf, funclen, ecb) < 0)
return -1;
/*
* Emit pre-context.
*/
for (; s1 < xch->i1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
return -1;
for (s1 = xch->i1, s2 = xch->i2;; xch = xch->next) {
/*
* Merge previous with current change atom.
*/
for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
return -1;
/*
* Removes lines from the first file.
*/
for (s1 = xch->i1; s1 < xch->i1 + xch->chg1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, "-", ecb) < 0)
return -1;
/*
* Adds lines from the second file.
*/
for (s2 = xch->i2; s2 < xch->i2 + xch->chg2; s2++)
if (xdl_emit_record(&xe->xdf2, s2, "+", ecb) < 0)
return -1;
if (xch == xche)
break;
s1 = xch->i1 + xch->chg1;
s2 = xch->i2 + xch->chg2;
}
/*
* Emit post-context.
*/
for (s1 = xche->i1 + xche->chg1; s1 < e1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
return -1;
}
return 0;
}