#include "xinclude.h"
static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec);
static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb);
static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec) {
*rec = xdf->recs[ri]->ptr;
return xdf->recs[ri]->size;
}
static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb) {
long size, psize = strlen(pre);
char const *rec;
size = xdl_get_rec(xdf, ri, &rec);
if (xdl_emit_diffrec(rec, size, pre, psize, ecb) < 0) {
return -1;
}
return 0;
}
xdchange_t *xdl_get_hunk(xdchange_t *xscr, xdemitconf_t const *xecfg) {
xdchange_t *xch, *xchp;
long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
for (xchp = xscr, xch = xscr->next; xch; xchp = xch, xch = xch->next)
if (xch->i1 - (xchp->i1 + xchp->chg1) > max_common)
break;
return xchp;
}
static long def_ff(const char *rec, long len, char *buf, long sz, void *priv)
{
if (len > 0 &&
(isalpha((unsigned char)*rec) ||
*rec == '_' ||
*rec == '$')) {
if (len > sz)
len = sz;
while (0 < len && isspace((unsigned char)rec[len - 1]))
len--;
memcpy(buf, rec, len);
return len;
}
return -1;
}
static int xdl_emit_common(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
xdemitconf_t const *xecfg) {
xdfile_t *xdf = &xe->xdf1;
const char *rchg = xdf->rchg;
long ix;
for (ix = 0; ix < xdf->nrec; ix++) {
if (rchg[ix])
continue;
if (xdl_emit_record(xdf, ix, "", ecb))
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;
long funclineprev = -1;
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 = 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;
if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
long l;
for (l = s1 - 1; l >= 0 && l > funclineprev; l--) {
const char *rec;
long reclen = xdl_get_rec(&xe->xdf1, l, &rec);
long newfunclen = ff(rec, reclen, funcbuf,
sizeof(funcbuf),
xecfg->find_func_priv);
if (newfunclen >= 0) {
funclen = newfunclen;
break;
}
}
funclineprev = s1 - 1;
}
if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
funcbuf, funclen, ecb) < 0)
return -1;
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) {
for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
return -1;
for (s1 = xch->i1; s1 < xch->i1 + xch->chg1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, "-", ecb) < 0)
return -1;
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;
}
for (s1 = xche->i1 + xche->chg1; s1 < e1; s1++)
if (xdl_emit_record(&xe->xdf1, s1, " ", ecb) < 0)
return -1;
}
return 0;
}