strvis.c
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上传日期:2007-01-04
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- /* $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 == ' 07' || c == 'r'))) {
- *dst++ = c;
- if (c == '\' && (flag & VIS_NOSLASH) == 0)
- *dst++ = '\';
- *dst = ' ';
- 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 ' 07':
- #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 ' ':
- *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 = ' ';
- 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 = ' ';
- 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, ' ');
- *dst = ' ';
- return (dst - start);
- }
- #else
- static void avoid_error __P((void));
- static void avoid_error()
- {
- avoid_error();
- }
- #endif /* !HAVE_STRVIS */