73 lines
1.5 KiB
C++
73 lines
1.5 KiB
C++
#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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unsigned char bios[65536];
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int
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main(int argc, char *argv[])
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{
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int bios_file;
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FILE * org_file;
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unsigned org, last_org, offset;
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int retval;
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unsigned int to_read, index;
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double elements, ratio;
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if (argc !=3 ) {
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fprintf(stderr, "Usage: usage bios-file org-file\n");
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exit(1);
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}
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bios_file = open(argv[1], O_RDONLY);
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org_file = fopen(argv[2], "r");
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if ( (bios_file<0) | (org_file==NULL) ) {
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fprintf(stderr, "problems opening files.\n");
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exit(1);
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}
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printf("files opened OK\n");
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to_read = 65536;
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index = 0;
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while (to_read > 0) {
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retval = read(bios_file, &bios[index], to_read);
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if (retval <= 0) {
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fprintf(stderr, "problem reading bios file\n");
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exit(1);
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}
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to_read -= retval;
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index += retval;
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}
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printf("bios file read in OK\n");
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last_org = 0;
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while (1) {
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retval = fscanf(org_file, "0x%x\n", &org);
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if (retval <= 0) break;
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printf("%04x .. %04x ", last_org, org-1);
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for (offset=org-1; offset>last_org; offset--) {
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if (bios[offset] != 0) break;
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}
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if (offset > last_org) {
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elements = (1.0 + double(offset) - double(last_org));
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}
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else {
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if (bios[last_org] == 0)
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elements = 0.0;
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else
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elements = 1.0;
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}
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ratio = elements / (double(org) - double(last_org));
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ratio *= 100.0;
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printf("%6.2lf\n", ratio);
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last_org = org;
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}
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}
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