Answer Posted / migf1

char *s_stripdups( char *s )
{
register char *cp1 = NULL; /* for parsing the whole s */
register char *cp2 = NULL; /* for keeping desired *cp1's */
int used[256] = {0}; /* ascii boolean map, for used chars */

/* sanity checks */
if ( !s ) {
errno = EFAULT;
return NULL;
}
if ( !*s ) {
errno = EINVAL;
return s;
}

for (cp1=cp2=s; *cp1; cp1++ )
{
if ( 0 == used[(int)(*cp1)] ) { /* 1st occurence of *cp1 */
*cp2++ = *cp1; /* copy it to start of s, via cp2 */
used[(int)(*cp1)] = 1; /* mark it as used */
}
}
*cp2 = 0; /* null terminate the trimmed s */

return s;
}

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