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/* $NetBSD: getline.c,v 1.2 2008/04/29 05:46:09 martin Exp $ */
/* $NetBSD: getline.c,v 1.2 2008/04/29 05:46:09 martin Exp $ */
/*-
* Copyright (c) 1997-2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <stdio.h>
/* Read a line from the FILE stream into buf/buflen using fgets(), so up
* to buflen-1 chars will be read and the result will be NUL terminated.
* If the line has a trailing newline it will be removed.
* If the line is too long, excess characters will be read until
* newline/EOF/error.
* If EOF/error occurs or a too-long line is encountered and errormsg
* isn't NULL, it will be changed to a description of the problem.
* (The EOF message has a leading \n for cosmetic purposes).
* Returns:
* >=0 length of line (excluding trailing newline) if all ok
* -1 error occurred
* -2 EOF encountered
* -3 line was too long
*/
int
getline(FILE *stream, char *buf, size_t buflen, const char **errormsg)
{
int rv, ch;
size_t len;
if (fgets(buf, buflen, stream) == NULL) {
if (feof(stream)) { /* EOF */
rv = -2;
if (errormsg)
*errormsg = "\nEOF received";
} else { /* error */
rv = -1;
if (errormsg)
*errormsg = "Error encountered";
}
clearerr(stream);
return rv;
}
len = strlen(buf);
if (buf[len-1] == '\n') { /* clear any trailing newline */
buf[--len] = '\0';
} else if (len == buflen-1) { /* line too long */
while ((ch = getchar()) != '\n' && ch != EOF)
continue;
if (errormsg)
*errormsg = "Input line is too long";
clearerr(stream);
return -3;
}
if (errormsg)
*errormsg = NULL;
return len;
}
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