/* substitute_matching_text: replace text matched by a pattern according to
a substitution template; return pointer to the modified text */
int
substitute_matching_text(pattern_t *pat, line_t *lp, int gflag, int kth)
{
int off = 0;
int changed = 0;
int matchno = 0;
int i = 0;
regmatch_t rm[SE_MAX];
char *txt;
char *eot;
if ((txt = get_sbuf_line(lp)) == NULL)
return ERR;
if (isbinary)
NUL_TO_NEWLINE(txt, lp->len);
eot = txt + lp->len;
if (!regexec(pat, txt, SE_MAX, rm, 0)) {
do {
if (!kth || kth == ++matchno) {
changed++;
i = rm[0].rm_so;
REALLOC(rbuf, rbufsz, off + i, ERR);
if (isbinary)
NEWLINE_TO_NUL(txt, rm[0].rm_eo);
memcpy(rbuf + off, txt, i);
off += i;
if ((off = apply_subst_template(txt, rm, off,
pat->re_nsub)) < 0)
return ERR;
} else {
i = rm[0].rm_eo;
REALLOC(rbuf, rbufsz, off + i, ERR);
if (isbinary)
NEWLINE_TO_NUL(txt, i);
memcpy(rbuf + off, txt, i);
off += i;
}
txt += rm[0].rm_eo;
} while (*txt &&
(!changed || ((gflag & GSG) && rm[0].rm_eo)) &&
!regexec(pat, txt, SE_MAX, rm, REG_NOTBOL));
i = eot - txt;
REALLOC(rbuf, rbufsz, off + i + 2, ERR);
if (i > 0 && !rm[0].rm_eo && (gflag & GSG)) {
errmsg = "infinite substitution loop";
return ERR;
}
if (isbinary)
NEWLINE_TO_NUL(txt, i);
memcpy(rbuf + off, txt, i);
memcpy(rbuf + off + i, "\n", 2);
}
return changed ? off + i + 1 : 0;
}
/* replace text matched by a pattern according to a substitution
template; return pointer to the modified text */
static int replace_matching_text( const line_t *lp, const int gflags,
const int snum )
{
const int se_max = 30; /* max subexpressions in a regular expression */
regmatch_t rm[se_max];
char *txt = get_sbuf_line( lp );
char *eot;
int i = 0, off = 0;
char changed = 0;
if( !txt ) return -1;
if( isbinary() ) nul_to_newline( txt, lp->len );
eot = txt + lp->len;
if( !regexec( global_pat, txt, se_max, rm, 0 ) )
{
int matchno = 0;
do {
if( !snum || snum == ++matchno )
{
changed = 1; i = rm[0].rm_so;
if( !resize_buffer( &rbuf, &rbufsz, off + i ) ) return -1;
if( isbinary() ) newline_to_nul( txt, rm[0].rm_eo );
memcpy( rbuf + off, txt, i ); off += i;
off = apply_subst_template( txt, rm, off, global_pat->re_nsub );
if( off < 0 ) return -1;
}
else
{
i = rm[0].rm_eo;
if( !resize_buffer( &rbuf, &rbufsz, off + i ) ) return -1;
if( isbinary() ) newline_to_nul( txt, i );
memcpy( rbuf + off, txt, i ); off += i;
}
txt += rm[0].rm_eo;
}
while( *txt && ( !changed || ( ( gflags & GSG ) && rm[0].rm_eo ) ) &&
!regexec( global_pat, txt, se_max, rm, REG_NOTBOL ) );
i = eot - txt;
if( !resize_buffer( &rbuf, &rbufsz, off + i + 2 ) ) return -1;
if( i > 0 && !rm[0].rm_eo && ( gflags & GSG ) )
{ set_error_msg( "Infinite substitution loop" ); return -1; }
if( isbinary() ) newline_to_nul( txt, i );
memcpy( rbuf + off, txt, i );
memcpy( rbuf + off + i, "\n", 2 );
}
return ( changed ? off + i + 1 : 0 );
}