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#include <stdlib.h>
#include <sys/time.h>
#include <stdio.h>
#include <time.h>
/* one provided by Aaaron Wiebe based on perl's hashing algorithm
* (so probably pretty generic). Not for excessively large strings!
*/
#if defined(__clang__)
#pragma GCC diagnostic ignored "-Wunknown-attributes"
#endif
static unsigned __attribute__((nonnull(1))) int
#if defined(__clang__)
__attribute__((no_sanitize("unsigned-integer-overflow")))
#endif
hash_from_string(void *k)
{
char *rkey = (char*) k;
unsigned hashval = 1;
while (*rkey)
hashval = hashval * 33 + *rkey++;
return hashval;
}
int main(int argc, char *argv[])
{
struct timeval tv;
struct timezone tz;
gettimeofday(&tv, &tz);
if(argc != 2) {
fprintf(stderr, "usage: test_id test-file-name\n");
exit(1);
}
printf("%06ld_%04.4x", tv.tv_usec, hash_from_string(argv[1]));
return 0;
}
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