NetBSD/sys/arch/pmax/test/sum.c

57 lines
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C
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#include <sys/param.h>
#include <sys/exec.h>
/*
* Print simple check sum for text and data section.
*/
void
main(argc, argv)
int argc;
char **argv;
{
register int fd, i, n;
char *fname;
struct coff_exec ex;
int tsum, dsum, word;
if (argc < 2) {
printf("usage: sum <file>\n");
goto err;
}
if ((fd = open(fname = argv[1], 0)) < 0)
goto err;
/* read the COFF header */
i = read(fd, (char *)&ex, sizeof(ex));
if (i != sizeof(ex) || COFF_BADMAG(ex)) {
printf("No COFF header\n");
goto cerr;
}
if (lseek(fd, COFF_TEXTOFF(ex), 0)) {
perror("lseek");
goto cerr;
}
tsum = 0;
for (n = ex.aouthdr.tsize; n > 0; n -= sizeof(int)) {
if (read(fd, &word, sizeof(word)) != sizeof(word)) {
perror("read text");
goto cerr;
}
tsum += word;
}
dsum = 0;
for (n = ex.aouthdr.dsize; n > 0; n -= sizeof(int)) {
if (read(fd, &word, sizeof(word)) != sizeof(word)) {
perror("read data");
goto cerr;
}
dsum += word;
}
printf("tsum %d dsum %d\n", tsum, dsum);
cerr:
close(fd);
err:
exit(0);
}