103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/* $NetBSD: read_line.c,v 1.1 1997/11/13 01:05:28 thorpej Exp $ */
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/*
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* Copyright (c) 1994 Mats O Jansson <moj@stacken.kth.se>
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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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* 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 Mats O Jansson
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* 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 <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: read_line.c,v 1.1 1997/11/13 01:05:28 thorpej Exp $");
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#endif
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#include <sys/param.h>
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#include <err.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "supcdefs.h"
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#include "supextern.h"
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/* read_line():
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* Read a line from a file, parsing continuations ending in \
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* and eliminating trailing newlines.
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* Returns a pointer to an internal buffer that is reused upon
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* next invocation.
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*/
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char *
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read_line(fp, size, lineno)
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FILE *fp;
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size_t *size;
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int *lineno;
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{
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static char *buf;
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static int buflen;
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size_t s, len;
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char *ptr;
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int cnt;
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len = 0;
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cnt = 1;
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while (cnt) {
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if (lineno != NULL)
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(*lineno)++;
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if ((ptr = fgetln(fp, &s)) == NULL) {
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if (size != NULL)
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*size = len;
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if (len == 0)
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return NULL;
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else
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return buf;
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}
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if (ptr[s - 1] == '\n') /* the newline may be missing at EOF */
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s--; /* forget newline */
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if (!s)
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cnt = 0;
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else {
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if ((cnt = (ptr[s - 1] == '\\')) != 0)
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s--; /* forget \\ */
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}
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if (len + s + 1 > buflen) {
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buflen = len + s + 1;
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buf = realloc(buf, buflen);
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}
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if (buf == NULL)
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err(1, "can't realloc");
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memcpy(buf + len, ptr, s);
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len += s;
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buf[len] = '\0';
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}
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if (size != NULL)
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*size = len;
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return buf;
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}
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