kc3-lang/libbsd/src/fparseln.c

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• Hash : 0982dcd9
  Author :
  Date : 2015-09-23T07:10:18
  

  Lock the file streams in fgetln() and fparseln() The fparseln() function had the NetBSD uppercase macros stubbed out, so replace them with the actual stdio ones. The fgetln() function was missing any locking at all.

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• src/fparseln.c

• /*	$NetBSD: fparseln.c,v 1.10 2009/10/21 01:07:45 snj Exp $	*/
  
  /*
   * Copyright (c) 1997 Christos Zoulas.  All rights reserved.
   *
   * 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 AUTHOR ``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 AUTHOR 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 <sys/cdefs.h>
  #if defined(LIBC_SCCS) && !defined(lint)
  __RCSID("$NetBSD: fparseln.c,v 1.10 2009/10/21 01:07:45 snj Exp $");
  #endif /* LIBC_SCCS and not lint */
  
  #include <assert.h>
  #include <errno.h>
  #include <stdio.h>
  #include <string.h>
  #include <stdlib.h>
  
  #define _DIAGASSERT(t)
  
  static int isescaped(const char *, const char *, int);
  
  /* isescaped():
   *	Return true if the character in *p that belongs to a string
   *	that starts in *sp, is escaped by the escape character esc.
   */
  static int
  isescaped(const char *sp, const char *p, int esc)
  {
  	const char     *cp;
  	size_t		ne;
  
  	_DIAGASSERT(sp != NULL);
  	_DIAGASSERT(p != NULL);
  
  	/* No escape character */
  	if (esc == '\0')
  		return 0;
  
  	/* Count the number of escape characters that precede ours */
  	for (ne = 0, cp = p; --cp >= sp && *cp == esc; ne++)
  		continue;
  
  	/* Return true if odd number of escape characters */
  	return (ne & 1) != 0;
  }
  
  
  /* fparseln():
   *	Read a line from a file parsing continuations ending in \
   *	and eliminating trailing newlines, or comments starting with
   *	the comment char.
   */
  char *
  fparseln(FILE *fp, size_t *size, size_t *lineno, const char str[3], int flags)
  {
  	static const char dstr[3] = { '\\', '\\', '#' };
  
  	ssize_t	s;
  	size_t len, ptrlen;
  	char   *buf;
  	char   *ptr, *cp;
  	int	cnt;
  	char	esc, con, nl, com;
  
  	_DIAGASSERT(fp != NULL);
  
  	len = 0;
  	buf = NULL;
  	ptrlen = 0;
  	ptr = NULL;
  	cnt = 1;
  
  	if (str == NULL)
  		str = dstr;
  
  	esc = str[0];
  	con = str[1];
  	com = str[2];
  	/*
  	 * XXX: it would be cool to be able to specify the newline character,
  	 * getdelim(3) does let us, but supporting it would diverge from BSDs.
  	 */
  	nl  = '\n';
  
  	flockfile(fp);
  
  	while (cnt) {
  		cnt = 0;
  
  		if (lineno)
  			(*lineno)++;
  
  		s = getline(&ptr, &ptrlen, fp);
  		if (s < 0)
  			break;
  
  		if (s && com) {		/* Check and eliminate comments */
  			for (cp = ptr; cp < ptr + s; cp++)
  				if (*cp == com && !isescaped(ptr, cp, esc)) {
  					s = cp - ptr;
  					cnt = s == 0 && buf == NULL;
  					break;
  				}
  		}
  
  		if (s && nl) { 		/* Check and eliminate newlines */
  			cp = &ptr[s - 1];
  
  			if (*cp == nl)
  				s--;	/* forget newline */
  		}
  
  		if (s && con) {		/* Check and eliminate continuations */
  			cp = &ptr[s - 1];
  
  			if (*cp == con && !isescaped(ptr, cp, esc)) {
  				s--;	/* forget continuation char */
  				cnt = 1;
  			}
  		}
  
  		if (s == 0) {
  			/*
  			 * nothing to add, skip realloc except in case
  			 * we need a minimal buf to return an empty line
  			 */
  			if (cnt || buf != NULL)
  				continue;
  		}
  
  		if ((cp = realloc(buf, len + s + 1)) == NULL) {
  			funlockfile(fp);
  			free(buf);
  			free(ptr);
  			return NULL;
  		}
  		buf = cp;
  
  		(void) memcpy(buf + len, ptr, s);
  		len += s;
  		buf[len] = '\0';
  	}
  
  	funlockfile(fp);
  	free(ptr);
  
  	if ((flags & FPARSELN_UNESCALL) != 0 && esc && buf != NULL &&
  	    strchr(buf, esc) != NULL) {
  		ptr = cp = buf;
  		while (cp[0] != '\0') {
  			int skipesc;
  
  			while (cp[0] != '\0' && cp[0] != esc)
  				*ptr++ = *cp++;
  			if (cp[0] == '\0' || cp[1] == '\0')
  				break;
  
  			skipesc = 0;
  			if (cp[1] == com)
  				skipesc += (flags & FPARSELN_UNESCCOMM);
  			if (cp[1] == con)
  				skipesc += (flags & FPARSELN_UNESCCONT);
  			if (cp[1] == esc)
  				skipesc += (flags & FPARSELN_UNESCESC);
  			if (cp[1] != com && cp[1] != con && cp[1] != esc)
  				skipesc = (flags & FPARSELN_UNESCREST);
  
  			if (skipesc)
  				cp++;
  			else
  				*ptr++ = *cp++;
  			*ptr++ = *cp++;
  		}
  		*ptr = '\0';
  		len = strlen(buf);
  	}
  
  	if (size)
  		*size = len;
  	return buf;
  }
  

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