diff options
Diffstat (limited to 'src/liboutils')
| -rw-r--r-- | src/liboutils/include/vis.h | 91 | ||||
| -rw-r--r-- | src/liboutils/unvis.c | 284 | ||||
| -rw-r--r-- | src/liboutils/vis.c | 220 |
3 files changed, 595 insertions, 0 deletions
diff --git a/src/liboutils/include/vis.h b/src/liboutils/include/vis.h new file mode 100644 index 0000000..5be397e --- /dev/null +++ b/src/liboutils/include/vis.h @@ -0,0 +1,91 @@ +/* $OpenBSD: vis.h,v 1.13 2010/08/24 23:49:06 djm Exp $ */ +/* $NetBSD: vis.h,v 1.4 1994/10/26 00:56:41 cgd Exp $ */ + +/*- + * Copyright (c) 1990 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. 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. + * + * @(#)vis.h 5.9 (Berkeley) 4/3/91 + */ + +#ifndef _VIS_H_ +#define _VIS_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_ALL 0x400 /* encode all characters */ + +/* + * other + */ +#define VIS_NOSLASH 0x40 /* inhibit printing '\' */ +#define VIS_GLOB 0x100 /* encode glob(3) magics and '#' */ + +/* + * 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 */ + +#include <sys/cdefs.h> + +__BEGIN_DECLS +char *vis(char *, int, int, int); +int strvis(char *, const char *, int); +int strnvis(char *, const char *, size_t, int) + __attribute__ ((__bounded__(__string__,1,3))); +int strvisx(char *, const char *, size_t, int) + __attribute__ ((__bounded__(__string__,1,3))); +int strunvis(char *, const char *); +int unvis(char *, char, int *, int); +ssize_t strnunvis(char *, const char *, size_t) + __attribute__ ((__bounded__(__string__,1,3))); + +__END_DECLS + +#endif /* !_VIS_H_ */ diff --git a/src/liboutils/unvis.c b/src/liboutils/unvis.c new file mode 100644 index 0000000..8982ca5 --- /dev/null +++ b/src/liboutils/unvis.c @@ -0,0 +1,284 @@ +/* $OpenBSD: unvis.c,v 1.15 2011/03/13 22:21:32 guenther Exp $ */ +/*- + * 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. 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 <ctype.h> +#include <vis.h> + +/* + * 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 */ + +#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') + +/* + * unvis - decode characters previously encoded by vis + */ +int +unvis(char *cp, char c, int *astate, int flag) +{ + + 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 = 0; + *astate = S_GROUND; + return (0); + 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(char *dst, const char *src) +{ + 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: + *dst = '\0'; + return (-1); + } + } + if (unvis(dst, c, &state, UNVIS_END) == UNVIS_VALID) + dst++; + *dst = '\0'; + return (dst - start); +} + +ssize_t +strnunvis(char *dst, const char *src, size_t sz) +{ + char c, p; + char *start = dst, *end = dst + sz - 1; + int state = 0; + + if (sz > 0) + *end = '\0'; + while ((c = *src++)) { + again: + switch (unvis(&p, c, &state, 0)) { + case UNVIS_VALID: + if (dst < end) + *dst = p; + dst++; + break; + case UNVIS_VALIDPUSH: + if (dst < end) + *dst = p; + dst++; + goto again; + case 0: + case UNVIS_NOCHAR: + break; + default: + if (dst <= end) + *dst = '\0'; + return (-1); + } + } + if (unvis(&p, c, &state, UNVIS_END) == UNVIS_VALID) { + if (dst < end) + *dst = p; + dst++; + } + if (dst <= end) + *dst = '\0'; + return (dst - start); +} + diff --git a/src/liboutils/vis.c b/src/liboutils/vis.c new file mode 100644 index 0000000..a1f4b0f --- /dev/null +++ b/src/liboutils/vis.c @@ -0,0 +1,220 @@ +/* $OpenBSD: vis.c,v 1.22 2011/03/13 22:21:32 guenther Exp $ */ +/*- + * 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. 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> +#include <string.h> +#include <vis.h> + +#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') +#define isvisible(c,flag) \ + (((c) == '\\' || (flag & VIS_ALL) == 0) && \ + (((u_int)(c) <= UCHAR_MAX && isascii((u_char)(c)) && \ + (((c) != '*' && (c) != '?' && (c) != '[' && (c) != '#') || \ + (flag & VIS_GLOB) == 0) && 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' || \ + isgraph((u_char)(c)))))) + +/* + * vis - visually encode characters + */ +char * +vis(char *dst, int c, int flag, int nextc) +{ + if (isvisible(c, flag)) { + *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; + case '\a': + *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) || + ((flag & VIS_GLOB) && (c == '*' || c == '?' || c == '[' || c == '#'))) { + *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((u_char)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(char *dst, const char *src, int flag) +{ + char c; + char *start; + + for (start = dst; (c = *src);) + dst = vis(dst, c, flag, *++src); + *dst = '\0'; + return (dst - start); +} + +int +strnvis(char *dst, const char *src, size_t siz, int flag) +{ + char *start, *end; + char tbuf[5]; + int c, i; + + i = 0; + for (start = dst, end = start + siz - 1; (c = *src) && dst < end; ) { + if (isvisible(c, flag)) { + i = 1; + *dst++ = c; + if (c == '\\' && (flag & VIS_NOSLASH) == 0) { + /* need space for the extra '\\' */ + if (dst < end) + *dst++ = '\\'; + else { + dst--; + i = 2; + break; + } + } + src++; + } else { + i = vis(tbuf, c, flag, *++src) - tbuf; + if (dst + i <= end) { + memcpy(dst, tbuf, i); + dst += i; + } else { + src--; + break; + } + } + } + if (siz > 0) + *dst = '\0'; + if (dst + i > end) { + /* adjust return value for truncation */ + while ((c = *src)) + dst += vis(tbuf, c, flag, *++src) - tbuf; + } + return (dst - start); +} + +int +strvisx(char *dst, const char *src, size_t len, int flag) +{ + 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); +} |