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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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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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* 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. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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#include <sys/types.h>
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#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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* vis - visually encode characters
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vis(dst, c, flag, nextc)
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if (flag & VIS_HTTPSTYLE) {
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/* Described in RFC 1808 */
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if (!(isalnum(c) /* alpha-numeric */
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|| c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
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|| c == '!' || c == '*' || c == '\'' || c == '('
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|| c == ')' || c == ',')) {
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snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
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if ((flag & VIS_GLOB) &&
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(c == '*' || c == '?' || c == '[' || c == '#'))
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else if (isgraph(c) ||
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((flag & VIS_SP) == 0 && c == ' ') ||
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((flag & VIS_TAB) == 0 && c == '\t') ||
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((flag & VIS_NL) == 0 && c == '\n') ||
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((flag & VIS_SAFE) && (c == '\b' || c == '\007' || c == '\r'))) {
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if (c == '\\' && (flag & VIS_NOSLASH) == 0)
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if (flag & VIS_CSTYLE) {
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if (isoctal(nextc)) {
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if (((c & 0177) == ' ') || isgraph(c) || (flag & VIS_OCTAL)) {
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*dst++ = ((u_char)c >> 6 & 07) + '0';
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*dst++ = ((u_char)c >> 3 & 07) + '0';
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*dst++ = ((u_char)c & 07) + '0';
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if ((flag & VIS_NOSLASH) == 0)
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* strvis, strvisx - visually encode characters from src into dst
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* Dst must be 4 times the size of src to account for possible
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* expansion. The length of dst, not including the trailing NUL,
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* Strvisx encodes exactly len bytes from src into dst.
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* This is useful for encoding a block of data.
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strvis(dst, src, flag)
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for (start = dst; (c = *src); )
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dst = vis(dst, c, flag, *++src);
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return (dst - start);
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strvisx(dst, src, len, flag)
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for (start = dst; len > 1; len--) {
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dst = vis(dst, c, flag, *++src);
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dst = vis(dst, *src, flag, '\0');
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return (dst - start);