GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: bin/ed/sub.c Lines: 0 130 0.0 %
Date: 2017-11-13 Branches: 0 284 0.0 %

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