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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.
*
* strbuf.c 20-Jan-99
*
*/
#include <stdlib.h>
#include <string.h>
#include "die.h"
#include "strbuf.h"
/*
* usage: string buffer
*
* sb = stropen();
* for (s = string; *s; s++)
* strputc(sb, *s);
* s = strvalue(sb);
* strstart(sb);
* strputs(sb, "hello");
* s = strvalue(sb);
* strclose(sb);
*/
/*
* expandbuf: expand buffer so that afford to the length data at least.
*
* i) sb STRBUF structure
* i) length required room
*/
void
expandbuf(sb, length)
STRBUF *sb;
int length;
{
int count = sb->curp - sb->sbuf;
sb->sbufsize += (length > EXPANDSIZE) ? length : EXPANDSIZE;
if (!(sb->sbuf = (char *)realloc(sb->sbuf, sb->sbufsize + 1)))
die("short of memory.");
sb->curp = sb->sbuf + count;
sb->endp = sb->sbuf + sb->sbufsize;
}
/*
* stropen: open string buffer.
*
* r) sb STRBUF structure
*/
STRBUF *
stropen(void)
{
STRBUF *sb = (STRBUF *)calloc(sizeof(STRBUF), 1);
if (sb == NULL)
die("short of memory.");
sb->sbufsize = INITIALSIZE;
if (!(sb->sbuf = (char *)malloc(sb->sbufsize + 1)))
die("short of memory.");
sb->curp = sb->sbuf;
sb->endp = sb->sbuf + sb->sbufsize;
return sb;
}
/*
* strstart: reset string buffer for new string.
*
* i) sb STRBUF structure
*/
void
strstart(sb)
STRBUF *sb;
{
sb->curp = sb->sbuf;
}
/*
* strbuflen: return the length of string buffer.
*
* i) sb STRBUF structure
*/
int
strbuflen(sb)
STRBUF *sb;
{
return sb->curp - sb->sbuf;
}
/*
* strpushback: return the number of charactor.
*
* i) sb STRBUF structure
* i) count number of charactor
*/
void
strpushback(sb, count)
STRBUF *sb;
int count;
{
if (sb->sbuf + count > sb->curp)
sb->curp = sb->sbuf;
else
sb->curp -= count;
}
/*
* strvalue: return the content of string buffer.
*
* i) sb STRBUF structure
* r) string
*/
char *
strvalue(sb)
STRBUF *sb;
{
*sb->curp = 0;
return sb->sbuf;
}
/*
* strclose: close string buffer.
*
* i) sb STRBUF structure
*/
void
strclose(sb)
STRBUF *sb;
{
(void)free(sb->sbuf);
(void)free(sb);
}
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