GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libutil/fparseln.c Lines: 28 61 45.9 %
Date: 2017-11-13 Branches: 23 76 30.3 %

Line Branch Exec Source
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/*	$OpenBSD: fparseln.c,v 1.7 2012/12/05 23:20:06 deraadt Exp $	*/
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/*	$NetBSD: fparseln.c,v 1.7 1999/07/02 15:49:12 simonb Exp $	*/
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/*
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 * Copyright (c) 1997 Christos Zoulas.  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 Christos Zoulas.
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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 OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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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 "util.h"
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static int isescaped(const char *, const char *, int);
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/* isescaped():
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 *	Return true if the character in *p that belongs to a string
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 *	that starts in *sp, is escaped by the escape character esc.
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 */
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static int
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isescaped(const char *sp, const char *p, int esc)
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{
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	const char     *cp;
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	size_t		ne;
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	/* No escape character */
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	if (esc == '\0')
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		return 1;
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	/* Count the number of escape characters that precede ours */
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	for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
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		continue;
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	/* Return true if odd number of escape characters */
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	return (ne & 1) != 0;
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}
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/* fparseln():
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 *	Read a line from a file parsing continuations ending in \
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 *	and eliminating trailing newlines, or comments starting with
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 *	the comment char.
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 */
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char *
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fparseln(FILE *fp, size_t *size, size_t *lineno, const char str[3],
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    int flags)
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{
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	static const char dstr[3] = { '\\', '\\', '#' };
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	char	*buf = NULL, *ptr, *cp, esc, con, nl, com;
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	size_t	s, len = 0;
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	int	cnt = 1;
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	if (str == NULL)
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		str = dstr;
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	esc = str[0];
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	con = str[1];
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	com = str[2];
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	/*
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	 * XXX: it would be cool to be able to specify the newline character,
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	 * but unfortunately, fgetln does not let us
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	 */
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	nl  = '\n';
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	while (cnt) {
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		cnt = 0;
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		if (lineno)
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			(*lineno)++;
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		if ((ptr = fgetln(fp, &s)) == NULL)
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			break;
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		if (s && com) {		/* Check and eliminate comments */
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			for (cp = ptr; cp < ptr + s; cp++)
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				if (*cp == com && !isescaped(ptr, cp, esc)) {
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					s = cp - ptr;
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					cnt = s == 0 && buf == NULL;
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					break;
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				}
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		}
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		if (s && nl) {		/* Check and eliminate newlines */
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			cp = &ptr[s - 1];
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			if (*cp == nl)
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				s--;	/* forget newline */
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		}
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		if (s && con) {		/* Check and eliminate continuations */
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			cp = &ptr[s - 1];
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			if (*cp == con && !isescaped(ptr, cp, esc)) {
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				s--;	/* forget escape */
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				cnt = 1;
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			}
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		}
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		if (s == 0 && buf != NULL)
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			continue;
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		if ((cp = realloc(buf, len + s + 1)) == NULL) {
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			free(buf);
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			return NULL;
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		}
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		buf = cp;
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		(void) 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 ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
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	    strchr(buf, esc) != NULL) {
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		ptr = cp = buf;
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		while (cp[0] != '\0') {
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			int skipesc;
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			while (cp[0] != '\0' && cp[0] != esc)
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				*ptr++ = *cp++;
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			if (cp[0] == '\0' || cp[1] == '\0')
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				break;
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			skipesc = 0;
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			if (cp[1] == com)
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				skipesc += (flags & FPARSELN_UNESCCOMM);
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			if (cp[1] == con)
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				skipesc += (flags & FPARSELN_UNESCCONT);
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			if (cp[1] == esc)
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				skipesc += (flags & FPARSELN_UNESCESC);
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			if (cp[1] != com && cp[1] != con && cp[1] != esc)
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				skipesc = (flags & FPARSELN_UNESCREST);
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			if (skipesc)
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				cp++;
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			else
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				*ptr++ = *cp++;
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			*ptr++ = *cp++;
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		}
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		*ptr = '\0';
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		len = strlen(buf);
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	}
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	if (size)
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		*size = len;
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	return buf;
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}
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#ifdef TEST
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int main(int, char **);
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int
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main(argc, argv)
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	int argc;
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	char **argv;
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{
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	char   *ptr;
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	size_t	size, line;
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	line = 0;
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	while ((ptr = fparseln(stdin, &size, &line, NULL,
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	    FPARSELN_UNESCALL)) != NULL)
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		printf("line %d (%d) |%s|\n", line, size, ptr);
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	return 0;
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}
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/*
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# This is a test
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line 1
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line 2 \
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line 3 # Comment
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line 4 \# Not comment \\\\
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# And a comment \
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line 5 \\\
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line 6
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*/
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#endif /* TEST */