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87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/* $NetBSD: getline.c,v 1.2 2008/04/29 05:46:09 martin Exp $ */
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/* $NetBSD: getline.c,v 1.2 2008/04/29 05:46:09 martin Exp $ */
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/*-
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* Copyright (c) 1997-2007 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Luke Mewburn.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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/* Read a line from the FILE stream into buf/buflen using fgets(), so up
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* to buflen-1 chars will be read and the result will be NUL terminated.
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* If the line has a trailing newline it will be removed.
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* If the line is too long, excess characters will be read until
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* newline/EOF/error.
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* If EOF/error occurs or a too-long line is encountered and errormsg
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* isn't NULL, it will be changed to a description of the problem.
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* (The EOF message has a leading \n for cosmetic purposes).
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* Returns:
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* >=0 length of line (excluding trailing newline) if all ok
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* -1 error occurred
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* -2 EOF encountered
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* -3 line was too long
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*/
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int
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getline(FILE *stream, char *buf, size_t buflen, const char **errormsg)
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{
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int rv, ch;
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size_t len;
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if (fgets(buf, buflen, stream) == NULL) {
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if (feof(stream)) { /* EOF */
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rv = -2;
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if (errormsg)
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*errormsg = "\nEOF received";
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} else { /* error */
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rv = -1;
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if (errormsg)
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*errormsg = "Error encountered";
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}
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clearerr(stream);
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return rv;
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}
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len = strlen(buf);
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if (buf[len-1] == '\n') { /* clear any trailing newline */
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buf[--len] = '\0';
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} else if (len == buflen-1) { /* line too long */
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while ((ch = getchar()) != '\n' && ch != EOF)
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continue;
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if (errormsg)
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*errormsg = "Input line is too long";
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clearerr(stream);
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return -3;
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}
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if (errormsg)
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*errormsg = NULL;
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return len;
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}
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