258 lines
6.1 KiB
C
258 lines
6.1 KiB
C
/* $OpenBSD: vis.c,v 1.25 2015/09/13 11:32:51 guenther Exp $ */
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/*-
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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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/* OPENBSD ORIGINAL: lib/libc/gen/vis.c */
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#include "includes.h"
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#if !defined(HAVE_STRNVIS) || defined(BROKEN_STRNVIS)
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/*
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* We want these to override in the BROKEN_STRNVIS case. TO avoid future sync
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* problems no-op out the weak symbol definition rather than remove it.
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*/
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#define DEF_WEAK(x)
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#include <sys/types.h>
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#include <errno.h>
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#include <ctype.h>
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#include <limits.h>
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#include <string.h>
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#include <stdlib.h>
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#include "vis.h"
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#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
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#define isvisible(c,flag) \
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(((c) == '\\' || (flag & VIS_ALL) == 0) && \
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(((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
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(((c) != '*' && (c) != '?' && (c) != '[' && (c) != '#') || \
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(flag & VIS_GLOB) == 0) && isgraph((u_char)(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' || \
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(c) == '\007' || (c) == '\r' || \
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isgraph((u_char)(c))))))
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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(char *dst, int c, int flag, int nextc)
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{
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if (isvisible(c, flag)) {
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if ((c == '"' && (flag & VIS_DQ) != 0) ||
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(c == '\\' && (flag & VIS_NOSLASH) == 0))
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*dst++ = '\\';
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*dst++ = c;
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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) == ' ') || (flag & VIS_OCTAL) ||
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((flag & VIS_GLOB) && (c == '*' || c == '?' || c == '[' || c == '#'))) {
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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((u_char)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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DEF_WEAK(vis);
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/*
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* strvis, strnvis, strvisx - visually encode characters from src into dst
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*
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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 NULL,
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* is returned.
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*
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* Strnvis will write no more than siz-1 bytes (and will NULL terminate).
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* The number of bytes needed to fully encode the string is returned.
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*
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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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*/
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int
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strvis(char *dst, const char *src, int flag)
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{
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char c;
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char *start;
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for (start = dst; (c = *src);)
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dst = vis(dst, c, flag, *++src);
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*dst = '\0';
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return (dst - start);
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}
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DEF_WEAK(strvis);
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int
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strnvis(char *dst, const char *src, size_t siz, int flag)
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{
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char *start, *end;
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char tbuf[5];
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int c, i;
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i = 0;
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for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
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if (isvisible(c, flag)) {
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if ((c == '"' && (flag & VIS_DQ) != 0) ||
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(c == '\\' && (flag & VIS_NOSLASH) == 0)) {
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/* need space for the extra '\\' */
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if (dst + 1 >= end) {
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i = 2;
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break;
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}
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*dst++ = '\\';
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}
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i = 1;
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*dst++ = c;
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src++;
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} else {
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i = vis(tbuf, c, flag, *++src) - tbuf;
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if (dst + i <= end) {
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memcpy(dst, tbuf, i);
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dst += i;
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} else {
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src--;
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break;
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}
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}
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}
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if (siz > 0)
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*dst = '\0';
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if (dst + i > end) {
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/* adjust return value for truncation */
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while ((c = *src))
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dst += vis(tbuf, c, flag, *++src) - tbuf;
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}
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return (dst - start);
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}
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int
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stravis(char **outp, const char *src, int flag)
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{
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char *buf;
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int len, serrno;
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buf = reallocarray(NULL, 4, strlen(src) + 1);
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if (buf == NULL)
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return -1;
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len = strvis(buf, src, flag);
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serrno = errno;
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*outp = realloc(buf, len + 1);
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if (*outp == NULL) {
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*outp = buf;
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errno = serrno;
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}
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return (len);
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}
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int
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strvisx(char *dst, const char *src, size_t len, int flag)
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{
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char c;
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char *start;
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for (start = dst; len > 1; len--) {
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c = *src;
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dst = vis(dst, c, flag, *++src);
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}
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if (len)
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dst = vis(dst, *src, flag, '\0');
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*dst = '\0';
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return (dst - start);
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}
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#endif
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