Logo Search packages:      
Sourcecode: dante version File versions

strvis.c

/* $Id: strvis.c,v 1.5 1999/05/13 16:35:58 karls Exp $ */

#ifdef HAVE_CONFIG_H
#include "autoconf.h"
#endif  /* HAVE_CONFIG_H */

#include "common.h"

#if !HAVE_STRVIS

/*-
 * Copyright (c) 1989, 1993
 *    The Regents of the University of California.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char rcsid[] = "$OpenBSD: vis.c,v 1.4 1997/07/25 20:30:05 mickey Exp $";
#endif /* LIBC_SCCS and not lint */

#ifndef _COMMON_H_
#include <sys/types.h>
#include <limits.h>
#endif /* !_COMMON_H_ */
#include <ctype.h>
/*#include <vis.h> */ /* get defines from compat.h */
#include "compat.h"

#define     isoctal(c)  (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')

/*
 * vis - visually encode characters
 */
char *
vis(dst, c, flag, nextc)
      register char *dst;
      int c, nextc;
      register int flag;
{
      if (((u_int)c <= UCHAR_MAX && isascii(c) && isgraph(c)) ||
         ((flag & VIS_SP) == 0 && c == ' ') ||
         ((flag & VIS_TAB) == 0 && c == '\t') ||
         ((flag & VIS_NL) == 0 && c == '\n') ||
         ((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
            *dst++ = c;
            if (c == '\\' && (flag & VIS_NOSLASH) == 0)
                  *dst++ = '\\';
            *dst = '\0';
            return (dst);
      }

      if (flag & VIS_CSTYLE) {
            switch(c) {
            case '\n':
                  *dst++ = '\\';
                  *dst++ = 'n';
                  goto done;
            case '\r':
                  *dst++ = '\\';
                  *dst++ = 'r';
                  goto done;
            case '\b':
                  *dst++ = '\\';
                  *dst++ = 'b';
                  goto done;
#ifdef STDC_HEADERS
            case '\a':
#else
            case '\007':
#endif  /* STDC_HEADERS */
                  *dst++ = '\\';
                  *dst++ = 'a';
                  goto done;
            case '\v':
                  *dst++ = '\\';
                  *dst++ = 'v';
                  goto done;
            case '\t':
                  *dst++ = '\\';
                  *dst++ = 't';
                  goto done;
            case '\f':
                  *dst++ = '\\';
                  *dst++ = 'f';
                  goto done;
            case ' ':
                  *dst++ = '\\';
                  *dst++ = 's';
                  goto done;
            case '\0':
                  *dst++ = '\\';
                  *dst++ = '0';
                  if (isoctal(nextc)) {
                        *dst++ = '0';
                        *dst++ = '0';
                  }
                  goto done;
            }
      }
      if (((c & 0177) == ' ') || (flag & VIS_OCTAL)) {
            *dst++ = '\\';
            *dst++ = ((u_char)c >> 6 & 07) + '0';
            *dst++ = ((u_char)c >> 3 & 07) + '0';
            *dst++ = ((u_char)c & 07) + '0';
            goto done;
      }
      if ((flag & VIS_NOSLASH) == 0)
            *dst++ = '\\';
      if (c & 0200) {
            c &= 0177;
            *dst++ = 'M';
      }
      if (iscntrl(c)) {
            *dst++ = '^';
            if (c == 0177)
                  *dst++ = '?';
            else
                  *dst++ = c + '@';
      } else {
            *dst++ = '-';
            *dst++ = c;
      }
done:
      *dst = '\0';
      return (dst);
}

/*
 * strvis, strvisx - visually encode characters from src into dst
 *
 *    Dst must be 4 times the size of src to account for possible
 *    expansion.  The length of dst, not including the trailing NULL,
 *    is returned.
 *
 *    Strvisx encodes exactly len bytes from src into dst.
 *    This is useful for encoding a block of data.
 */
int
strvis(dst, src, flag)
      register char *dst;
      register const char *src;
      int flag;
{
      register char c;
      char *start;

      for (start = dst; (c = *src);)
            dst = vis(dst, c, flag, *++src);
      *dst = '\0';
      return (dst - start);
}

int
strvisx(dst, src, len, flag)
      register char *dst;
      register const char *src;
      register size_t len;
      int flag;
{
      register char c;
      char *start;

      for (start = dst; len > 1; len--) {
            c = *src;
            dst = vis(dst, c, flag, *++src);
      }
      if (len)
            dst = vis(dst, *src, flag, '\0');
      *dst = '\0';

      return (dst - start);
}
#else
static void avoid_error __P((void));
static void avoid_error()
{
      avoid_error();
}
#endif /* !HAVE_STRVIS */

Generated by  Doxygen 1.6.0   Back to index