--- /dev/null
+/* $Id$
+ * vis functions - visually encode characters
+ * Originally from OpenBSD
+ */
+
+/*-
+ * 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.
+ */
+
+#ifndef HAVE_STRVIS
+#include "vis.h"
+/*
+ * vis - visually encode characters
+ */
+char *
+vis(dst, c, flag, nextc)
+ register char *dst;
+ int c, nextc;
+ register int flag;
+{
+ if (isvisible(c)) {
+ *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__
+ case '\a':
+#else
+ case '\007':
+#endif
+ *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, strnvis, 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.
+ *
+ * Strnvis will write no more than siz-1 bytes (and will NULL terminate).
+ * The number of bytes needed to fully encode the string 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
+strnvis(dst, src, siz, flag)
+ register char *dst;
+ register const char *src;
+ size_t siz;
+ int flag;
+{
+ register char c;
+ char *start, *end;
+
+ for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) {
+ if (isvisible(c)) {
+ *dst++ = c;
+ if (c == '\\' && (flag & VIS_NOSLASH) == 0) {
+ /* need space for the extra '\\' */
+ if (dst < end)
+ *dst++ = '\\';
+ else {
+ dst--;
+ break;
+ }
+ }
+ src++;
+ } else {
+ /* vis(3) requires up to 4 chars */
+ if (dst + 3 < end)
+ dst = vis(dst, c, flag, *++src);
+ else
+ break;
+ }
+ }
+ *dst = '\0';
+ if (dst >= end) {
+ char tbuf[5];
+
+ /* adjust return value for truncation */
+ while ((c = *src))
+ dst += vis(tbuf, c, flag, *++src) - tbuf;
+ }
+ 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);
+}
+
+/*
+ * unvis - decode characters previously encoded by vis
+ */
+int
+#ifdef __STDC__
+unvis(char *cp, char c, int *astate, int flag)
+#else
+unvis(cp, c, astate, flag)
+ char *cp;
+ char c;
+ int *astate, flag;
+#endif
+{
+
+ if (flag & UNVIS_END) {
+ if (*astate == S_OCTAL2 || *astate == S_OCTAL3) {
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ }
+ return (*astate == S_GROUND ? UNVIS_NOCHAR : UNVIS_SYNBAD);
+ }
+
+ switch (*astate) {
+
+ case S_GROUND:
+ *cp = 0;
+ if (c == '\\') {
+ *astate = S_START;
+ return (0);
+ }
+ *cp = c;
+ return (UNVIS_VALID);
+
+ case S_START:
+ switch(c) {
+ case '\\':
+ *cp = c;
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case '0': case '1': case '2': case '3':
+ case '4': case '5': case '6': case '7':
+ *cp = (c - '0');
+ *astate = S_OCTAL2;
+ return (0);
+ case 'M':
+ *cp = (char) 0200;
+ *astate = S_META;
+ return (0);
+ case '^':
+ *astate = S_CTRL;
+ return (0);
+ case 'n':
+ *cp = '\n';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case 'r':
+ *cp = '\r';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case 'b':
+ *cp = '\b';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case 'a':
+ *cp = '\007';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case 'v':
+ *cp = '\v';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case 't':
+ *cp = '\t';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case 'f':
+ *cp = '\f';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case 's':
+ *cp = ' ';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case 'E':
+ *cp = '\033';
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+ case '\n':
+ /*
+ * hidden newline
+ */
+ *astate = S_GROUND;
+ return (UNVIS_NOCHAR);
+ case '$':
+ /*
+ * hidden marker
+ */
+ *astate = S_GROUND;
+ return (UNVIS_NOCHAR);
+ }
+ *astate = S_GROUND;
+ return (UNVIS_SYNBAD);
+
+ case S_META:
+ if (c == '-')
+ *astate = S_META1;
+ else if (c == '^')
+ *astate = S_CTRL;
+ else {
+ *astate = S_GROUND;
+ return (UNVIS_SYNBAD);
+ }
+ return (0);
+
+ case S_META1:
+ *astate = S_GROUND;
+ *cp |= c;
+ return (UNVIS_VALID);
+
+ case S_CTRL:
+ if (c == '?')
+ *cp |= 0177;
+ else
+ *cp |= c & 037;
+ *astate = S_GROUND;
+ return (UNVIS_VALID);
+
+ case S_OCTAL2: /* second possible octal digit */
+ if (isoctal(c)) {
+ /*
+ * yes - and maybe a third
+ */
+ *cp = (*cp << 3) + (c - '0');
+ *astate = S_OCTAL3;
+ return (0);
+ }
+ /*
+ * no - done with current sequence, push back passed char
+ */
+ *astate = S_GROUND;
+ return (UNVIS_VALIDPUSH);
+
+ case S_OCTAL3: /* third possible octal digit */
+ *astate = S_GROUND;
+ if (isoctal(c)) {
+ *cp = (*cp << 3) + (c - '0');
+ return (UNVIS_VALID);
+ }
+ /*
+ * we were done, push back passed char
+ */
+ return (UNVIS_VALIDPUSH);
+
+ default:
+ /*
+ * decoder in unknown state - (probably uninitialized)
+ */
+ *astate = S_GROUND;
+ return (UNVIS_SYNBAD);
+ }
+}
+
+/*
+ * strunvis - decode src into dst
+ *
+ * Number of chars decoded into dst is returned, -1 on error.
+ * Dst is null terminated.
+ */
+
+int
+strunvis(dst, src)
+ register char *dst;
+ register const char *src;
+{
+ register char c;
+ char *start = dst;
+ int state = 0;
+
+ while ((c = *src++)) {
+ again:
+ switch (unvis(dst, c, &state, 0)) {
+ case UNVIS_VALID:
+ dst++;
+ break;
+ case UNVIS_VALIDPUSH:
+ dst++;
+ goto again;
+ case 0:
+ case UNVIS_NOCHAR:
+ break;
+ default:
+ return (-1);
+ }
+ }
+ if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID)
+ dst++;
+ *dst = '\0';
+ return (dst - start);
+}
+
+#endif /* HAVE_STRVIS */
--- /dev/null
+/* $Id$
+ * vis functions - visually encode characters
+ * Originally from OpenBSD
+ */
+
+/*-
+ * 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.
+ */
+
+#include <sys/types.h>
+#include <limits.h>
+#include <ctype.h>
+/*
+ * to select alternate encoding format
+ */
+#define VIS_OCTAL 0x01 /* use octal \ddd format */
+#define VIS_CSTYLE 0x02 /* use \[nrft0..] where appropriate */
+/*
+ * to alter set of characters encoded (default is to encode all
+ * non-graphic except space, tab, and newline).
+ */
+#define VIS_SP 0x04 /* also encode space */
+#define VIS_TAB 0x08 /* also encode tab */
+#define VIS_NL 0x10 /* also encode newline */
+#define VIS_WHITE (VIS_SP | VIS_TAB | VIS_NL)
+#define VIS_SAFE 0x20 /* only encode "unsafe" characters */
+
+#define VIS_NOSLASH 0x40 /* inhibit printing '\' */
+
+/*
+ * unvis return codes
+ */
+#define UNVIS_VALID 1 /* character valid */
+#define UNVIS_VALIDPUSH 2 /* character valid, push back passed char */
+#define UNVIS_NOCHAR 3 /* valid sequence, no character produced */
+#define UNVIS_SYNBAD -1 /* unrecognized escape sequence */
+#define UNVIS_ERROR -2 /* decoder in unknown state (unrecoverable) */
+
+/*
+ * unvis flags
+ */
+#define UNVIS_END 1 /* no more characters */
+
+#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
+#define isvisible(c) (((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \
+ isgraph((u_char)(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')))
+
+/*
+ * decode driven by state machine
+ */
+#define S_GROUND 0 /* haven't seen escape char */
+#define S_START 1 /* start decoding special sequence */
+#define S_META 2 /* metachar started (M) */
+#define S_META1 3 /* metachar more, regular char (-) */
+#define S_CTRL 4 /* control char started (^) */
+#define S_OCTAL2 5 /* octal digit 2 */
+#define S_OCTAL3 6 /* octal digit 3 */
+
+char *vis(char *, int, int, int);
+int strvis(char *, const char *, int);
+int strnvis(char *, const char *, size_t, int);
+int strvisx(char *, const char *, size_t, int);
+int strunvis(char *, const char *);
+int unvis(char *, char, int *, int);
andersk / moira.git / commitdiff
