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Diffstat (limited to 'main/editline/np/vis.c')
| -rw-r--r-- | main/editline/np/vis.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/main/editline/np/vis.c b/main/editline/np/vis.c new file mode 100644 index 000000000..83265f46e --- /dev/null +++ b/main/editline/np/vis.c @@ -0,0 +1,348 @@ +/* $NetBSD: vis.c,v 1.22 2002/03/23 17:38:27 christos Exp $ */ + +/*- + * Copyright (c) 1999 The NetBSD Foundation, Inc. + * 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/cdefs.h> +#if defined(LIBC_SCCS) && !defined(lint) +__RCSID("$NetBSD: vis.c,v 1.22 2002/03/23 17:38:27 christos Exp $"); +#endif /* LIBC_SCCS and not lint */ + +#include <sys/types.h> + +#include <assert.h> +#include "np/vis.h" +#include <stdlib.h> + +#ifdef __weak_alias +__weak_alias(strsvis,_strsvis) +__weak_alias(strsvisx,_strsvisx) +__weak_alias(strvis,_strvis) +__weak_alias(strvisx,_strvisx) +__weak_alias(svis,_svis) +__weak_alias(vis,_vis) +#endif + +#if !HAVE_VIS_H +#include <ctype.h> +#include <limits.h> +#include <stdio.h> +#include <string.h> + +#undef BELL +#if defined(__STDC__) +#define BELL '\a' +#else +#define BELL '\007' +#endif + +#ifdef SOLARIS +#include <alloca.h> +typedef unsigned int u_int32_t; +#endif + +#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') +#define iswhite(c) (c == ' ' || c == '\t' || c == '\n') +#define issafe(c) (c == '\b' || c == BELL || c == '\r') +#define xtoa(c) "0123456789abcdef"[c] + +#define MAXEXTRAS 5 + + +#define MAKEEXTRALIST(flag, extra, orig) \ +do { \ + const char *o = orig; \ + char *e; \ + while (*o++) \ + continue; \ + extra = alloca((size_t)((o - orig) + MAXEXTRAS)); \ + for (o = orig, e = extra; (*e++ = *o++) != '\0';) \ + continue; \ + e--; \ + if (flag & VIS_SP) *e++ = ' '; \ + if (flag & VIS_TAB) *e++ = '\t'; \ + if (flag & VIS_NL) *e++ = '\n'; \ + if ((flag & VIS_NOSLASH) == 0) *e++ = '\\'; \ + *e = '\0'; \ +} while (/*CONSTCOND*/0) + + +/* + * This is HVIS, the macro of vis used to HTTP style (RFC 1808) + */ +#define HVIS(dst, c, flag, nextc, extra) \ +do \ + if (!isascii(c) || !isalnum(c) || strchr("$-_.+!*'(),", c) != NULL) { \ + *dst++ = '%'; \ + *dst++ = xtoa(((unsigned int)c >> 4) & 0xf); \ + *dst++ = xtoa((unsigned int)c & 0xf); \ + } else { \ + SVIS(dst, c, flag, nextc, extra); \ + } \ +while (/*CONSTCOND*/0) + +/* + * This is SVIS, the central macro of vis. + * dst: Pointer to the destination buffer + * c: Character to encode + * flag: Flag word + * nextc: The character following 'c' + * extra: Pointer to the list of extra characters to be + * backslash-protected. + */ +#define SVIS(dst, c, flag, nextc, extra) \ +do { \ + int isextra, isc; \ + isextra = strchr(extra, c) != NULL; \ + if (!isextra && isascii(c) && (isgraph(c) || iswhite(c) || \ + ((flag & VIS_SAFE) && issafe(c)))) { \ + *dst++ = c; \ + break; \ + } \ + isc = 0; \ + if (flag & VIS_CSTYLE) { \ + switch (c) { \ + case '\n': \ + isc = 1; *dst++ = '\\'; *dst++ = 'n'; \ + break; \ + case '\r': \ + isc = 1; *dst++ = '\\'; *dst++ = 'r'; \ + break; \ + case '\b': \ + isc = 1; *dst++ = '\\'; *dst++ = 'b'; \ + break; \ + case BELL: \ + isc = 1; *dst++ = '\\'; *dst++ = 'a'; \ + break; \ + case '\v': \ + isc = 1; *dst++ = '\\'; *dst++ = 'v'; \ + break; \ + case '\t': \ + isc = 1; *dst++ = '\\'; *dst++ = 't'; \ + break; \ + case '\f': \ + isc = 1; *dst++ = '\\'; *dst++ = 'f'; \ + break; \ + case ' ': \ + isc = 1; *dst++ = '\\'; *dst++ = 's'; \ + break; \ + case '\0': \ + isc = 1; *dst++ = '\\'; *dst++ = '0'; \ + if (isoctal(nextc)) { \ + *dst++ = '0'; \ + *dst++ = '0'; \ + } \ + } \ + } \ + if (isc) break; \ + if (isextra || ((c & 0177) == ' ') || (flag & VIS_OCTAL)) { \ + *dst++ = '\\'; \ + *dst++ = (u_char)(((u_int32_t)(u_char)c >> 6) & 03) + '0'; \ + *dst++ = (u_char)(((u_int32_t)(u_char)c >> 3) & 07) + '0'; \ + *dst++ = (c & 07) + '0'; \ + } else { \ + 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; \ + } \ + } \ +} while (/*CONSTCOND*/0) + + +/* + * svis - visually encode characters, also encoding the characters + * pointed to by `extra' + */ +char * +svis(dst, c, flag, nextc, extra) + char *dst; + int c, flag, nextc; + const char *extra; +{ + char *nextra; + _DIAGASSERT(dst != NULL); + _DIAGASSERT(extra != NULL); + MAKEEXTRALIST(flag, nextra, extra); + if (flag & VIS_HTTPSTYLE) + HVIS(dst, c, flag, nextc, nextra); + else + SVIS(dst, c, flag, nextc, nextra); + *dst = '\0'; + return(dst); +} + + +/* + * strsvis, strsvisx - visually encode characters from src into dst + * + * Extra is a pointer to a \0-terminated list of characters to + * be encoded, too. These functions are useful e. g. to + * encode strings in such a way so that they are not interpreted + * by a shell. + * + * 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. + * + * Strsvisx encodes exactly len bytes from src into dst. + * This is useful for encoding a block of data. + */ +int +strsvis(dst, src, flag, extra) + char *dst; + const char *src; + int flag; + const char *extra; +{ + char c; + char *start; + char *nextra; + + _DIAGASSERT(dst != NULL); + _DIAGASSERT(src != NULL); + _DIAGASSERT(extra != NULL); + MAKEEXTRALIST(flag, nextra, extra); + if (flag & VIS_HTTPSTYLE) { + for (start = dst; (c = *src++) != '\0'; /* empty */) + HVIS(dst, c, flag, *src, nextra); + } else { + for (start = dst; (c = *src++) != '\0'; /* empty */) + SVIS(dst, c, flag, *src, nextra); + } + *dst = '\0'; + return (dst - start); +} + + +int +strsvisx(dst, src, len, flag, extra) + char *dst; + const char *src; + size_t len; + int flag; + const char *extra; +{ + char c; + char *start; + char *nextra; + + _DIAGASSERT(dst != NULL); + _DIAGASSERT(src != NULL); + _DIAGASSERT(extra != NULL); + MAKEEXTRALIST(flag, nextra, extra); + + if (flag & VIS_HTTPSTYLE) { + for (start = dst; len > 0; len--) { + c = *src++; + HVIS(dst, c, flag, len ? *src : '\0', nextra); + } + } else { + for (start = dst; len > 0; len--) { + c = *src++; + SVIS(dst, c, flag, len ? *src : '\0', nextra); + } + } + *dst = '\0'; + return (dst - start); +} + + +/* + * vis - visually encode characters + */ +char * +vis(dst, c, flag, nextc) + char *dst; + int c, flag, nextc; + +{ + char *extra; + + _DIAGASSERT(dst != NULL); + + MAKEEXTRALIST(flag, extra, ""); + if (flag & VIS_HTTPSTYLE) + HVIS(dst, c, flag, nextc, extra); + else + SVIS(dst, c, flag, nextc, extra); + *dst = '\0'; + return (dst); +} + + +/* + * strvis, 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. + * + * Strvisx encodes exactly len bytes from src into dst. + * This is useful for encoding a block of data. + */ +int +strvis(dst, src, flag) + char *dst; + const char *src; + int flag; +{ + char *extra; + + MAKEEXTRALIST(flag, extra, ""); + return (strsvis(dst, src, flag, extra)); +} + + +int +strvisx(dst, src, len, flag) + char *dst; + const char *src; + size_t len; + int flag; +{ + char *extra; + + MAKEEXTRALIST(flag, extra, ""); + return (strsvisx(dst, src, len, flag, extra)); +} +#endif |