fbbd9655e5
Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann <jschauma@stevens.edu> Pull Request: https://github.com/freebsd/freebsd/pull/96
189 lines
4.9 KiB
C
189 lines
4.9 KiB
C
/*-
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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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*
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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. 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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*
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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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* SUCH DAMAGE.
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*
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* Defived from FreeBSD head/lib/libc/gen/vis.c 165903, head/include/vis.h
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* 203964.
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*/
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#include <sys/types.h>
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#include <limits.h>
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#include <ctype.h>
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#include <stdio.h>
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/*
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* to select alternate encoding format
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*/
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#define VIS_OCTAL 0x01 /* use octal \ddd format */
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#define VIS_CSTYLE 0x02 /* use \[nrft0..] where appropriate */
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/*
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* to alter set of characters encoded (default is to encode all
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* non-graphic except space, tab, and newline).
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*/
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#define VIS_SP 0x04 /* also encode space */
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#define VIS_TAB 0x08 /* also encode tab */
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#define VIS_NL 0x10 /* also encode newline */
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#define VIS_WHITE (VIS_SP | VIS_TAB | VIS_NL)
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#define VIS_SAFE 0x20 /* only encode "unsafe" characters */
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/*
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* other
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*/
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#define VIS_NOSLASH 0x40 /* inhibit printing '\' */
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#define VIS_HTTPSTYLE 0x80 /* http-style escape % HEX HEX */
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#define VIS_GLOB 0x100 /* encode glob(3) magics */
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/*
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* unvis return codes
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*/
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#define UNVIS_VALID 1 /* character valid */
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#define UNVIS_VALIDPUSH 2 /* character valid, push back passed char */
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#define UNVIS_NOCHAR 3 /* valid sequence, no character produced */
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#define UNVIS_SYNBAD -1 /* unrecognized escape sequence */
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#define UNVIS_ERROR -2 /* decoder in unknown state (unrecoverable) */
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/*
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* unvis flags
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*/
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#define UNVIS_END 1 /* no more characters */
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#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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/*
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* vis - visually encode characters
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*/
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char *
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vis(dst, c, flag, nextc)
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char *dst;
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int c, nextc;
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int flag;
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{
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c = (unsigned char)c;
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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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/* safe */
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|| c == '$' || c == '-' || c == '_' || c == '.' || c == '+'
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/* extra */
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|| c == '!' || c == '*' || c == '\'' || c == '('
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|| c == ')' || c == ',')) {
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*dst++ = '%';
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snprintf(dst, 4, (c < 16 ? "0%X" : "%X"), c);
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dst += 2;
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goto done;
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}
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}
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if ((flag & VIS_GLOB) &&
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(c == '*' || c == '?' || c == '[' || c == '#'))
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;
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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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*dst++ = c;
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if (c == '\\' && (flag & VIS_NOSLASH) == 0)
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*dst++ = '\\';
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*dst = '\0';
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return (dst);
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}
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if (flag & VIS_CSTYLE) {
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switch(c) {
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case '\n':
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*dst++ = '\\';
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*dst++ = 'n';
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goto done;
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case '\r':
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*dst++ = '\\';
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*dst++ = 'r';
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goto done;
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case '\b':
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*dst++ = '\\';
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*dst++ = 'b';
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goto done;
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case '\a':
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*dst++ = '\\';
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*dst++ = 'a';
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goto done;
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case '\v':
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*dst++ = '\\';
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*dst++ = 'v';
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goto done;
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case '\t':
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*dst++ = '\\';
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*dst++ = 't';
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goto done;
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case '\f':
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*dst++ = '\\';
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*dst++ = 'f';
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goto done;
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case ' ':
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*dst++ = '\\';
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*dst++ = 's';
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goto done;
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case '\0':
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*dst++ = '\\';
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*dst++ = '0';
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if (isoctal(nextc)) {
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*dst++ = '0';
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*dst++ = '0';
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}
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goto done;
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}
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}
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if (((c & 0177) == ' ') || isgraph(c) || (flag & VIS_OCTAL)) {
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*dst++ = '\\';
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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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goto done;
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}
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if ((flag & VIS_NOSLASH) == 0)
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*dst++ = '\\';
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if (c & 0200) {
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c &= 0177;
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*dst++ = 'M';
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}
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if (iscntrl(c)) {
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*dst++ = '^';
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if (c == 0177)
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*dst++ = '?';
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else
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*dst++ = c + '@';
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} else {
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*dst++ = '-';
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*dst++ = c;
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}
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done:
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*dst = '\0';
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return (dst);
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}
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