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/*
* Copyright (c) 1996, 1997, 1998, 1999
* Shigio Yamaguchi. All rights reserved.
* Copyright (c) 1999
* Tama Communications Corporation. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Tama Communications
* Corporation and its contributors.
* 4. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
* tab.c 8-Oct-98
*
*/
#include <stdio.h>
#include "tab.h"
static int tabs = 8;
#define TABPOS(i) ((i)%tabs == 0)
/*
* settabs: set default tab stop
*
* i) n tab stop
*/
void
settabs(n)
int n;
{
if (n < 1 || n > 32)
return;
tabs = n;
}
/*
* detab: convert tabs into spaces and print
*
* i) op FILE *
* i) buf string including tabs
*/
void
detab(op, buf)
FILE *op;
char *buf;
{
int src, dst;
char c;
src = dst = 0;
while ((c = buf[src++]) != 0) {
if (c == '\t') {
do {
(void)putc(' ', op);
dst++;
} while (!TABPOS(dst));
} else {
(void)putc(c, op);
dst++;
}
}
(void)putc('\n', op);
}
/*
* entab: convert spaces into tabs
*
* io) buf string buffer
*/
void
entab(buf)
char *buf;
{
int blanks = 0;
int pos, src, dst;
char c;
pos = src = dst = 0;
while ((c = buf[src++]) != 0) {
if (c == ' ') {
if (!TABPOS(++pos)) {
blanks++; /* count blanks */
continue;
}
/* don't convert single blank into tab */
buf[dst++] = (blanks == 0) ? ' ' : '\t';
} else if (c == '\t') {
while (!TABPOS(++pos))
;
buf[dst++] = '\t';
} else {
++pos;
while (blanks--)
buf[dst++] = ' ';
buf[dst++] = c;
}
blanks = 0;
}
if (blanks > 0)
while (blanks--)
buf[dst++] = ' ';
buf[dst] = 0;
}
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