138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
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* Copyright (c) 1996, 1997, 1998 Shigio Yamaguchi. 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Shigio Yamaguchi.
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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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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* mgets.c 29-Aug-98
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*
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*/
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#include <ctype.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 "die.h"
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#include "mgets.h"
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#define EXPANDSIZE 127
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#define MINSIZE 16
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static int mbufsize = EXPANDSIZE;
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static char *mbuf;
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/*
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* mgets: read whole record into allocated buffer
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*
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* i) ip input stream
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* o) length record length
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* i) flags flags
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* MGETS_CONT \\ + \n -> ''
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* MGETS_SKIPCOM skip line which start with '#'.
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* MGETS_TAILCUT remove following blanks
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* r) record buffer (NULL at end of file)
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*
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* Returned buffer has whole record.
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* The buffer end with '\0' and doesn't include '\r' and '\n'.
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*/
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char *
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mgets(ip, length, flags)
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FILE *ip;
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int *length;
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int flags;
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{
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char *p;
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/*
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* allocate initial buffer.
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*/
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if (!mbuf)
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if (!(mbuf = (char *)malloc(mbufsize + 1)))
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die("short of memory.");
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/*
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* read whole record.
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*/
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if (!fgets(mbuf, mbufsize, ip))
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return NULL;
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if (flags & MGETS_SKIPCOM)
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while (*mbuf == '#')
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if (!fgets(mbuf, mbufsize, ip))
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return NULL;
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p = mbuf + strlen(mbuf);
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for (;;) {
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/*
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* get a line.
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*/
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while (*(p - 1) != '\n') {
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/*
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* expand buffer and read additionally.
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*/
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int count = p - mbuf;
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if (mbufsize - count < MINSIZE) {
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mbufsize += EXPANDSIZE;
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if (!(mbuf = (char *)realloc(mbuf, mbufsize + 1)))
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die("short of memory.");
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p = mbuf + count;
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}
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if (!fgets(p, mbufsize - count, ip)) {
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*p++ = '\n';
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break;
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}
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p += strlen(p);
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}
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/*
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* chop(mbuf)
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*/
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*(--p) = 0;
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if (*(p - 1) == '\r')
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*(--p) = 0;
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/*
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* continue?
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*/
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if ((flags & MGETS_CONT) && *(p - 1) == '\\')
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*(--p) = 0;
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else
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break;
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}
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/*
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if (flags & MGETS_SKIPCOM)
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for (p = mbuf; *p; p++)
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if (*p == '#') {
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*p = 0;
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break;
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}
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*/
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if (flags & MGETS_TAILCUT)
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while (isspace(*(--p)))
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*p = 0;
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if (length)
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*length = p - mbuf;
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return mbuf;
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}
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