60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
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/*
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* Sccsid: @(#)verify.c 9.1.1.1 12/14/95 15:45:19
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*
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* a simple routine to verify the accuracy of a DBGEN version
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*
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* Algorithm:
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* traverse the data file named on the command line, OR-ing each
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* set of 4 characters (8 for machines with 64 bit support). Output
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* the reulting value to stdout
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*/
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#include "config.h"
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#include <stdlib.h>
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#if (defined(_POSIX_)||!defined(WIN32))
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#include <unistd.h>
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#endif /* WIN32 */
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#include <io.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#define BUFFER (1024 * 64)
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int
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main(int ac, char **av)
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{
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int fd;
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char buffer[BUFFER];
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long *lptr,
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result = 0L,
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steps,
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i,
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cnt;
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if (ac != 2)
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goto bad;
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if ((fd = open(av[1], O_RDONLY, 0)) == -1)
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goto bad;
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while((cnt = (long)read(fd, buffer, BUFFER)) > 0)
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{
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steps = cnt / sizeof(long);
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for (i=0L, lptr = (long *)buffer; i < steps; i++, lptr++)
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result ^= *lptr;
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}
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if (cnt == 0)
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{
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fprintf(stderr, "%s verified\n", av[1]);
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printf("%s:\t%ld\n", av[1], result);
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}
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else
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fprintf(stderr, "read() error: %d\n", errno);
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exit(cnt);
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return 0; // to suppress compiler warnings
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bad:
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fprintf(stderr, "\nUSAGE: %s <file>\n", av[0]);
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fprintf(stderr, "\tcomputes a simplified checksum of <file>\n\n");
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exit(1);
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}
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