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diff --git a/bin/ed/sub.c b/bin/ed/sub.c
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+++ b/bin/ed/sub.c
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+/* $OpenBSD: sub.c,v 1.18 2016/10/11 06:54:05 martijn Exp $ */
+/* $NetBSD: sub.c,v 1.4 1995/03/21 09:04:50 cgd Exp $ */
+
+/* sub.c: This file contains the substitution routines for the ed
+ line editor */
+/*-
+ * Copyright (c) 1993 Andrew Moore, Talke Studio.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <limits.h>
+#include <regex.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#ifndef REG_STARTEND
+#define REG_STARTEND 0004
+#endif
+
+#include "ed.h"
+
+static char *extract_subst_template(void);
+static int substitute_matching_text(regex_t *, line_t *, int, int);
+static int apply_subst_template(char *, regmatch_t *, int, int);
+
+static char *rhbuf; /* rhs substitution buffer */
+static int rhbufsz; /* rhs substitution buffer size */
+static int rhbufi; /* rhs substitution buffer index */
+
+/* extract_subst_tail: extract substitution tail from the command buffer */
+int
+extract_subst_tail(int *flagp, int *np)
+{
+ char delimiter;
+
+ *flagp = *np = 0;
+ if ((delimiter = *ibufp) == '\n') {
+ rhbufi = 0;
+ *flagp = GPR;
+ return 0;
+ } else if (extract_subst_template() == NULL)
+ return ERR;
+ else if (*ibufp == '\n') {
+ *flagp = GPR;
+ return 0;
+ } else if (*ibufp == delimiter)
+ ibufp++;
+ if ('1' <= *ibufp && *ibufp <= '9') {
+ STRTOI(*np, ibufp);
+ return 0;
+ } else if (*ibufp == 'g') {
+ ibufp++;
+ *flagp = GSG;
+ return 0;
+ }
+ return 0;
+}
+
+
+/* extract_subst_template: return pointer to copy of substitution template
+ in the command buffer */
+static char *
+extract_subst_template(void)
+{
+ int n = 0;
+ int i = 0;
+ char c;
+ char delimiter = *ibufp++;
+
+ if (*ibufp == '%' && *(ibufp + 1) == delimiter) {
+ ibufp++;
+ if (!rhbuf)
+ seterrmsg("no previous substitution");
+ return rhbuf;
+ }
+ while (*ibufp != delimiter) {
+ REALLOC(rhbuf, rhbufsz, i + 2, NULL);
+ if ((c = rhbuf[i++] = *ibufp++) == '\n' && *ibufp == '\0') {
+ i--, ibufp--;
+ break;
+ } else if (c != '\\')
+ ;
+ else if ((rhbuf[i++] = *ibufp++) != '\n')
+ ;
+ else if (!isglobal) {
+ while ((n = get_tty_line()) == 0 ||
+ (n > 0 && ibuf[n - 1] != '\n'))
+ clearerr(stdin);
+ if (n < 0)
+ return NULL;
+ }
+ }
+ REALLOC(rhbuf, rhbufsz, i + 1, NULL);
+ rhbuf[rhbufi = i] = '\0';
+ return rhbuf;
+}
+
+
+static char *rbuf; /* substitute_matching_text buffer */
+static int rbufsz; /* substitute_matching_text buffer size */
+
+/* search_and_replace: for each line in a range, change text matching a pattern
+ according to a substitution template; return status */
+int
+search_and_replace(regex_t *pat, int gflag, int kth)
+{
+ undo_t *up;
+ char *txt;
+ char *eot;
+ int lc;
+ int xa = current_addr;
+ int nsubs = 0;
+ line_t *lp;
+ int len;
+
+ current_addr = first_addr - 1;
+ for (lc = 0; lc <= second_addr - first_addr; lc++) {
+ lp = get_addressed_line_node(++current_addr);
+ if ((len = substitute_matching_text(pat, lp, gflag, kth)) < 0)
+ return ERR;
+ else if (len) {
+ up = NULL;
+ if (delete_lines(current_addr, current_addr) < 0)
+ return ERR;
+ txt = rbuf;
+ eot = rbuf + len;
+ SPL1();
+ do {
+ if ((txt = put_sbuf_line(txt)) == NULL) {
+ SPL0();
+ return ERR;
+ } else if (up)
+ up->t = get_addressed_line_node(current_addr);
+ else if ((up = push_undo_stack(UADD,
+ current_addr, current_addr)) == NULL) {
+ SPL0();
+ return ERR;
+ }
+ } while (txt != eot);
+ SPL0();
+ nsubs++;
+ xa = current_addr;
+ }
+ }
+ current_addr = xa;
+ if (nsubs == 0 && !(gflag & GLB)) {
+ seterrmsg("no match");
+ return ERR;
+ } else if ((gflag & (GPR | GLS | GNP)) &&
+ display_lines(current_addr, current_addr, gflag) < 0)
+ return ERR;
+ return 0;
+}
+
+
+/* substitute_matching_text: replace text matched by a pattern according to
+ a substitution template; return length of rbuf if changed, 0 if unchanged, or
+ ERR on error */
+static int
+substitute_matching_text(regex_t *pat, line_t *lp, int gflag, int kth)
+{
+ int off = 0;
+ int changed = 0;
+ int matchno = 0;
+ int i = 0;
+ int nempty = -1;
+ regmatch_t rm[SE_MAX];
+ char *txt;
+ char *eot, *eom;
+
+ if ((eom = 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 {
+/* Don't do a 0-length match directly after a non-0-length */
+ if (rm[0].rm_eo == nempty) {
+ rm[0].rm_so++;
+ rm[0].rm_eo = lp->len;
+ continue;
+ }
+ if (!kth || kth == ++matchno) {
+ changed = 1;
+ i = rm[0].rm_so - (eom - txt);
+ REALLOC(rbuf, rbufsz, off + i, ERR);
+ if (isbinary)
+ NEWLINE_TO_NUL(eom,
+ rm[0].rm_eo - (eom - txt));
+ memcpy(rbuf + off, eom, i);
+ off += i;
+ if ((off = apply_subst_template(txt, rm, off,
+ pat->re_nsub)) < 0)
+ return ERR;
+ eom = txt + rm[0].rm_eo;
+ if (kth)
+ break;
+ }
+ if (rm[0].rm_so == rm[0].rm_eo)
+ rm[0].rm_so = rm[0].rm_eo + 1;
+ else
+ nempty = rm[0].rm_so = rm[0].rm_eo;
+ rm[0].rm_eo = lp->len;
+ } while (rm[0].rm_so < lp->len && (gflag & GSG || kth) &&
+ !regexec(pat, txt, SE_MAX, rm, REG_STARTEND | REG_NOTBOL));
+ i = eot - eom;
+ REALLOC(rbuf, rbufsz, off + i + 2, ERR);
+ if (isbinary)
+ NEWLINE_TO_NUL(eom, i);
+ memcpy(rbuf + off, eom, i);
+ memcpy(rbuf + off + i, "\n", 2);
+ }
+ return changed ? off + i + 1 : 0;
+}
+
+
+/* apply_subst_template: modify text according to a substitution template;
+ return offset to end of modified text */
+static int
+apply_subst_template(char *boln, regmatch_t *rm, int off, int re_nsub)
+{
+ int j = 0;
+ int k = 0;
+ int n;
+ char *sub = rhbuf;
+
+ for (; sub - rhbuf < rhbufi; sub++)
+ if (*sub == '&') {
+ j = rm[0].rm_so;
+ k = rm[0].rm_eo;
+ REALLOC(rbuf, rbufsz, off + k - j, ERR);
+ while (j < k)
+ rbuf[off++] = boln[j++];
+ } else if (*sub == '\\' && '1' <= *++sub && *sub <= '9' &&
+ (n = *sub - '0') <= re_nsub) {
+ j = rm[n].rm_so;
+ k = rm[n].rm_eo;
+ REALLOC(rbuf, rbufsz, off + k - j, ERR);
+ while (j < k)
+ rbuf[off++] = boln[j++];
+ } else {
+ REALLOC(rbuf, rbufsz, off + 1, ERR);
+ rbuf[off++] = *sub;
+ }
+ REALLOC(rbuf, rbufsz, off + 1, ERR);
+ rbuf[off] = '\0';
+ return off;
+}
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