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/*************************************************************************
wn_load_map_array(map_array,from,to)
wn_strmap(s,map_array)
wn_memmap(mem,len,map_array)
wn_strcharmap(s,from_c,to_c)
*************************************************************************/
/****************************************************************************
COPYRIGHT NOTICE:
The source code in this file is provided free of charge
to the author's consulting clients. It is in the
public domain and therefore may be used by anybody for
any purpose.
AUTHOR:
Will Naylor
****************************************************************************/
#include "wnlib.h"
#include "wnasrt.h"
#include "wnmap.h"
#define MASK (255) /* make char positive */
void wn_strcharmap(register char *s,register char from_c,register char to_c)
{
register int c;
for(;;)
{
c = *s;
if(c == '\0')
{
break;
}
else if(c == from_c)
{
*s = to_c;
}
++s;
}
}
void wn_strmap(register char *s,register char map_array[256])
{
register char c;
for(;;)
{
c = *s;
if(c == '\0')
{
break;
}
*s = map_array[c&MASK];
++s;
}
}
void wn_memmap(register char *string,int len,register char map_array[256])
{
register char *fin;
fin = string+len;
for(;string != fin;++string)
{
*string = map_array[(*string)&MASK];
}
}
local void identity_map_array(register char map_array[256])
{
register int c;
for(c=0;c<256;++c)
{
map_array[c] = (char)c;
}
}
void wn_load_map_array(register char map_array[256],
register char *from,register char *to)
{
identity_map_array(map_array);
for(;;)
{
if(*from == '\0')
{
wn_assert(*to == '\0');
break;
}
map_array[(*from)&MASK] = *to;
++from; ++to;
}
}
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