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code.c
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code.c
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/*
* Copyright (c) 2003 Regents of The University of Michigan.
* All Rights Reserved. See COPYRIGHT.
*/
#include "config.h"
#include <sys/param.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "code.h"
/*
* Escape certain characters. This code must match decode() *and*
* argcargv().
*/
char *
encode( char *line )
{
/* static */
static char buf[ 2 * MAXPATHLEN ];
char *temp;
if ( strlen( line ) > MAXPATHLEN ) {
return( NULL );
}
temp = buf;
for ( ; *line != '\0'; line++, temp++ ) {
switch ( *line ) {
case ' ' :
*temp = '\\';
temp++;
*temp = 'b';
break;
case '\t' :
*temp = '\\';
temp++;
*temp = 't';
break;
case '\n':
*temp = '\\';
temp++;
*temp = 'n';
break;
case '\r':
*temp = '\\';
temp++;
*temp = 'r';
break;
case '\\':
*temp = '\\';
temp++;
*temp = '\\';
break;
default :
*temp = *line;
break;
}
}
*temp = '\0';
return( buf );
}
char *
decode( char *line )
{
/* static */
static char buf[ MAXPATHLEN ];
char *temp, *end;
if ( strlen( line ) > ( 2 * MAXPATHLEN )) {
return( NULL );
}
end = buf + MAXPATHLEN;
temp = buf;
for ( ; *line != '\0'; line++, temp++ ) {
/* Check for buffer overflow - must have space for '\0' */
if ( temp >= end ) {
return( NULL );
}
switch( *line ) {
case '\\':
line++;
switch( *line ) {
case 'n':
*temp = '\n';
break;
case 't':
*temp = '\t';
break;
case 'b':
*temp = ' ';
break;
case 'r':
*temp = '\r';
break;
case '\\':
*temp = '\\';
break;
default:
break;
}
break;
default:
*temp = *line;
break;
}
}
*temp = '\0';
return( buf );
}