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/*
* Copyright 1998 by Albert Cahalan; all rights resered.
* This file may be used subject to the terms and conditions of the
* GNU Library General Public License Version 2, or any later version
* at your option, as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Library General Public License for more details.
*/
#include <sys/types.h>
/* sanitize a string, without the nice BSD library function: */
/* strvis(vis_args, k->ki_args, VIS_TAB | VIS_NL | VIS_NOSLASH) */
int octal_escape_str(char *dst, const char *src, size_t n){
unsigned char c;
char d;
size_t i;
const char *codes =
"Z------abtnvfr-------------e----"
" *******************************" /* better: do not print any space */
"****************************\\***"
"*******************************-"
"--------------------------------"
"********************************"
"********************************"
"********************************";
for(i=0; i<n;){
c = (unsigned char) *(src++);
d = codes[c];
switch(d){
case 'Z':
goto leave;
case '*':
i++;
*(dst++) = c;
break;
case '-':
if(i+4 > n) goto leave;
i += 4;
*(dst++) = '\\';
*(dst++) = "01234567"[c>>6];
*(dst++) = "01234567"[(c>>3)&07];
*(dst++) = "01234567"[c&07];
break;
default:
if(i+2 > n) goto leave;
i += 2;
*(dst++) = '\\';
*(dst++) = d;
break;
}
}
leave:
*(dst++) = '\0';
return i;
}
/* sanitize a string via one-way mangle */
int simple_escape_str(char *dst, const char *src, size_t n){
unsigned char c;
size_t i;
const char *codes =
"Z-------------------------------"
"********************************"
"********************************"
"*******************************-"
"--------------------------------"
"********************************"
"********************************"
"********************************";
for(i=0; i<n;){
c = (unsigned char) *(src++);
switch(codes[c]){
case 'Z':
goto leave;
case '*':
i++;
*(dst++) = c;
break;
case '-':
i++;
*(dst++) = '?';
break;
}
}
leave:
*(dst++) = '\0';
return i;
}
/* sanitize a string for HTML */
int html_escape_str(char *dst, const char *src, size_t n){
unsigned char c;
size_t i;
const char *codes =
"Z-------------------------------"
"**q***&*********************<*>*"
"********************************"
"*******************************-"
"--------------------------------"
"********************************"
"********************************"
"********************************";
for(i=0; i<n;){
c = (unsigned char) *(src++);
switch(codes[c]){
case 'Z':
goto leave;
case '*':
i++;
*(dst++) = c;
break;
case '-':
i++;
*(dst++) = '?';
break;
case '&':
if(i+5 > n) goto leave;
i += 5;
*(dst++) = '&';
*(dst++) = 'a';
*(dst++) = 'm';
*(dst++) = 'p';
*(dst++) = ';';
break;
case '<':
if(i+4 > n) goto leave;
i += 4;
*(dst++) = '&';
*(dst++) = 'l';
*(dst++) = 't';
*(dst++) = ';';
break;
case '>':
if(i+4 > n) goto leave;
i += 4;
*(dst++) = '&';
*(dst++) = 'g';
*(dst++) = 't';
*(dst++) = ';';
break;
case 'q':
if(i+6 > n) goto leave;
i += 6;
*(dst++) = '&';
*(dst++) = 'q';
*(dst++) = 'u';
*(dst++) = 'o';
*(dst++) = 't';
*(dst++) = ';';
break;
}
}
leave:
*(dst++) = '\0';
return i;
}
/* escape a string as desired */
int escape_str(char *dst, const char *src, size_t n){
return simple_escape_str(dst, src, n);
}
/* escape an argv or environment string array */
int escape_strlist(char *dst, const char **src, size_t n){
size_t i = 0;
while(*src){
i += simple_escape_str(dst+i, *src, n-i);
if((n-i > 1) && (*(src+1))) dst[i++] = ' ';
src++;
}
return i;
}
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