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/* |
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* Hydra, an http server |
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* escape.c |
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* Copyright (C) 2001 Jon Nelson <jnelson@boa.org> |
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* Based on escape.pl, Copyright (C) 1996 Larry Doolittle <ldoolitt@boa.org> |
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* Copyright (C) 2001 Larry Doolittle <ldoolitt@boa.org> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 1, or (at your option) |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*/ |
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|
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/* $Id: escape.c,v 1.1.1.1 2002/09/21 13:53:16 nmav Exp $ */ |
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|
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/* |
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unreserved = alnum | mark |
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alnum = "0".."9" | "A".."Z" | "a".."z" |
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mark = "-" | "_" | "." | "!" | "~" | "*" | "'" | "(" | ")" |
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noescape = unreserved | ":" | "@" | "&" | "=" | "+" | "$" | "," | "/" |
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*/ |
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|
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#ifdef TEST |
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#include <stdio.h> |
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#include <stdlib.h> |
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#else |
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#include "boa.h" |
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#endif |
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|
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#include "escape.h" |
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|
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unsigned long _needs_escape[(NEEDS_ESCAPE_BITS+NEEDS_ESCAPE_WORD_LENGTH-1)/NEEDS_ESCAPE_WORD_LENGTH]; |
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|
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void build_needs_escape(void) |
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{ |
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unsigned int a, b; |
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const unsigned char special[] = |
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"ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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"abcdefghijklmnopqrstuvwxyz" |
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"0123456789" |
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"-_.!~*'():@&=+$,/?"; |
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/* 21 Mar 2002 - jnelson - confirm with Apache 1.3.23 that '?' |
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* is safe to leave unescaped. |
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*/ |
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unsigned short i, j; |
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|
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b = 1; |
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for (a=0; b!=0; a++) b=b<<1; |
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/* I found $a bit positions available in an unsigned long. */ |
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if (a < NEEDS_ESCAPE_WORD_LENGTH) { |
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fprintf(stderr, |
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"NEEDS_ESCAPE_SHIFT configuration error -- "\ |
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"%d should be <= log2(%d)\n", |
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NEEDS_ESCAPE_SHIFT, a); |
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exit(1); |
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} else if (a >= 2*NEEDS_ESCAPE_WORD_LENGTH) { |
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/* needs_escape_shift configuration suboptimal */ |
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} else { |
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/* Ahh, just right! */; |
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} |
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memset(_needs_escape, ~0, sizeof(_needs_escape)); |
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for(i = 0; i < sizeof(special) - 1; ++i) { |
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j=special[i]; |
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if (j>=NEEDS_ESCAPE_BITS) { |
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/* warning: character $j will be needlessly escaped. */ |
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} else { |
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_needs_escape[NEEDS_ESCAPE_INDEX(j)]&=~NEEDS_ESCAPE_MASK(j); |
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} |
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} |
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} |
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|
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#ifdef TEST |
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int main(void) |
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{ |
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int i; |
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build_needs_escape(); |
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for(i = 0; i <= NEEDS_ESCAPE_BITS; ++i) { |
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if (needs_escape(i)) { |
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fprintf(stdout, "%3d needs escape.\n", i); |
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} |
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} |
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return(0); |
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} |
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#endif |
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|