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/* by tino@augsburg.net
*/
#include <stdio.h>
#include <string.h>
#include <dirent.h>
unsigned char
test(void)
{
DIR *dir;
struct dirent *dp;
unsigned char c;
if ((dir=opendir("."))==0)
{
perror("open .");
return 0;
}
c = 0;
while ((dp=readdir(dir))!=0)
{
size_t len;
len = strlen(dp->d_name);
if (len<4)
continue;
if (strcmp(dp->d_name+len-4, ".TST"))
continue;
if (len!=5)
{
fprintf(stderr, "warning: %s\n", dp->d_name);
printf(" length");
continue;
}
if (c)
printf(" double%d\n", c);
c = dp->d_name[0];
}
if (closedir(dir))
perror("close .");
return c;
}
int
main(void)
{
char name[256];
unsigned char map[256], upper[256], lower[256];
int i, j, c;
FILE *fd;
if (test())
{
printf("There are *.TST files, please remove\n");
return 0;
}
for (i=0; ++i<256; )
{
lower[i] = i;
upper[i] = 0;
}
for (i=256; --i; )
{
map[i] = i;
strcpy(name, "..TST");
name[0] = i;
printf("%d:", i);
if ((fd=fopen(name, "w"))==0)
printf(" open");
else
fclose(fd);
c = test();
if (unlink(name))
printf(" unlink");
if (c==i)
printf(" ok");
else
printf(" %d", c);
printf("\n");
if (c!=i)
{
upper[c]++;
lower[c] = i;
}
map[i] = c;
}
/* Uppercase characters are detected above on:
* The character is mapped to itself and there is a
* character which maps to it.
* Lowercase characters are the lowest character pointing to another one.
* Else it is a one way character.
*
* For this reason we have to process the list
* 1) for 'one way' characters
* 'one way' is something which is no upper and no lower character.
* This is an awful, crude and ugly hack due to missing Samba support.
* 2) for true uppercase/lowercase characters
* 3) for standalone characters
* Note that there might be characters which do not fall into 1 to 3.
*/
printf("\n valid chars =");
for (i=0; ++i<256; )
if (map[i] && map[i]!=i && lower[map[i]]!=i)
{
if (!upper[i])
printf(" %d:%d %d:%d %d:%d", /*1*/
map[i], i, i, map[i], map[i], map[i]);
else
fprintf(stderr, "ignoring map %d->%d because of %d->%d\n",
lower[i], i, i, map[i]);
}
for (i=0; ++i<256; )
if (map[i] && map[i]==i)
if (upper[i])
printf(" %d:%d", lower[i], i); /*2*/
else
printf(" %d", i); /*3*/
printf("\n");
return 0;
}
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