backslash.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Copyright (c) 1986 AT&T
* All Rights Reserved
*/
#ident "%Z%%M% %I% %E% SMI" /* SVr4.0 1.1 */
#include <stdio.h>
#include <ctype.h>
#include "wish.h"
char *strchr();
static char withbs[] = "\b\f\n\r\t\\\33";
static char woutbs[] = "bfnrt\\E";
char *
backslash(s, n)
char *s;
int n;
{
char *_backslash();
return _backslash(s, n, withbs, woutbs);
}
char *
_backslash(s, n, in, out)
char *s;
int n;
char *in;
char *out;
{
register char *dst;
register char *p;
n -= strlen(s);
for (dst = s; *dst; dst++) {
if (!isprint(*dst)) {
if ((p = strchr(in, *dst)) && n > 0) {
*dst++ = '\\';
memshift(dst + 1, dst, strlen(dst) + 1);
*dst = out[p - in];
n--;
}
else {
register int c;
memshift(dst + 3, dst, strlen(dst) + 1);
c = *dst;
*dst++ = '\\';
*dst++ = ((c >> 6) & 3) + '0';
*dst++ = ((c >> 3) & 7) + '0';
*dst = (c & 7) + '0';
}
}
}
return s;
}
char *
unbackslash(s)
char *s;
{
register char *src;
register char *dst;
register char *p;
for (dst = src = s; *src; src++) {
if (*src == '\\') {
if (p = strchr(woutbs, src[1])) {
*dst++ = withbs[p - woutbs];
src++;
}
else if (isdigit(src[1])) {
register int c;
c = *++src - '0';
if (isdigit(src[1])) {
c = (c << 3) + *++src - '0';
if (isdigit(src[1]))
c = (c << 3) + *++src - '0';
}
*dst++ = c;
}
}
else
*dst++ = *src;
}
*dst = '\0';
return s;
}