/* $NetBSD: vis.c,v 1.24 2002/07/03 17:18:09 pooka 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 #if defined(LIBC_SCCS) && !defined(lint) __RCSID("$NetBSD: vis.c,v 1.24 2002/07/03 17:18:09 pooka Exp $"); #endif /* LIBC_SCCS and not lint */ #include "namespace.h" #include #include #include #include #ifdef __weak_alias __weak_alias(strsvis,_strsvis) __weak_alias(strsvisx,_strsvisx) __weak_alias(strvis,_strvis) __weak_alias(strvisx,_strvisx) __weak_alias(svis,_svis) __weak_alias(vis,_vis) #endif #if !HAVE_VIS || !HAVE_SVIS #include #include #include #include #undef BELL #define BELL '\a' #define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7') #define iswhite(c) (c == ' ' || c == '\t' || c == '\n') #define issafe(c) (c == '\b' || c == BELL || c == '\r') #define xtoa(c) "0123456789abcdef"[c] #define MAXEXTRAS 5 #define MAKEEXTRALIST(flag, extra, orig) \ do { \ const char *o = orig; \ char *e; \ while (*o++) \ continue; \ extra = alloca((size_t)((o - orig) + MAXEXTRAS)); \ for (o = orig, e = extra; (*e++ = *o++) != '\0';) \ continue; \ e--; \ if (flag & VIS_SP) *e++ = ' '; \ if (flag & VIS_TAB) *e++ = '\t'; \ if (flag & VIS_NL) *e++ = '\n'; \ if ((flag & VIS_NOSLASH) == 0) *e++ = '\\'; \ *e = '\0'; \ } while (/*CONSTCOND*/0) /* * This is HVIS, the macro of vis used to HTTP style (RFC 1808) */ #define HVIS(dst, c, flag, nextc, extra) \ do \ if (!isascii(c) || !isalnum(c) || strchr("$-_.+!*'(),", 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); } #endif #if !HAVE_VIS /* * 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