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hash.c
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hash.c
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#include <stdio.h>
#include <string.h>
static const char hashtable[256] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29, 0, 0,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15,
16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,30,
31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
};
int main(int argc, char **argv)
{
int i, hash = 0;
char *arg = NULL;
if (argc < 3)
{
fprintf(stderr, "usage: %s c|n arg1 <arg2>...\n", argv[0]);
return (-1);
}
switch(argv[1][0])
{
case 'c':
for ( i = 1; i < argc; i++)
{
arg = strdup(argv[i]);
hash = (((arg)[0]&31)<<5 | ((arg)[1]&31));
printf("%s: %d\n", arg, hash);
}
return (0);
case 'n':
for ( i = 1; i < argc; i++)
{
arg = strdup(argv[i]);
hash = hashtable[(unsigned char)((arg)[1])]<<5 | (arg[1] ? hashtable[(unsigned char)((arg)[2])] : 0);
printf("%s: %d\n", arg, hash);
}
return (0);
default:
fprintf(stderr, "usage: %s c|n arg1 <arg2>...\n"i, argv[0]);
return (-1);
}
}