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[/] [eco32/] [trunk/] [simtest/] [disk/] [wrtmbr/] [wrtmbr.c] - Blame information for rev 113

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Line No. Rev Author Line
1 9 hellwig
/*
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 * wrtmbr.c -- write the master boot record to the disk
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#define SECTOR_SIZE             512
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void error(char *fmt, ...) {
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  va_list ap;
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  va_start(ap, fmt);
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  fprintf(stderr, "Error: ");
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  vfprintf(stderr, fmt, ap);
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  fprintf(stderr, "\n");
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  va_end(ap);
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  exit(1);
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}
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void usage(char *myself) {
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  fprintf(stderr,
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          "Usage: %s <disk file> <master boot record file>\n",
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          myself);
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  exit(1);
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}
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int main(int argc, char *argv[]) {
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  FILE *diskFile;
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  FILE *bootFile;
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  unsigned char sectorBuffer[SECTOR_SIZE];
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  if (argc != 3) {
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    usage(argv[0]);
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  }
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  diskFile = fopen(argv[1], "r+b");
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  if (diskFile == NULL) {
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    error("cannot open disk file '%s'", argv[1]);
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  }
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  bootFile = fopen(argv[2], "rb");
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  if (bootFile == NULL) {
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    error("cannot open boot sector file '%s'", argv[2]);
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  }
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  if (fseek(bootFile, 0, SEEK_END) != 0) {
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    error("cannot position to end of boot sector file");
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  }
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  if (ftell(bootFile) != SECTOR_SIZE) {
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    error("'%s' is not a proper boot sector file (wrong length)", argv[2]);
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  }
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  if (fseek(bootFile, 0, SEEK_SET) != 0) {
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    error("cannot position to start of boot sector file");
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  }
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  if (fread(sectorBuffer, SECTOR_SIZE, 1, bootFile) != 1) {
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    error("cannot read data from boot sector file");
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  }
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  fclose(bootFile);
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  if (sectorBuffer[SECTOR_SIZE - 2] != 0x55 ||
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      sectorBuffer[SECTOR_SIZE - 1] != 0xAA) {
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    error("'%s' is not a proper boot sector file (no signature)", argv[2]);
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  }
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  if (fseek(diskFile, 0, SEEK_SET) != 0) {
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    error("cannot position to start of disk file");
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  }
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  if (fwrite(sectorBuffer, 1, SECTOR_SIZE, diskFile) != SECTOR_SIZE) {
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    error("cannot write boot sector to disk file");
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  }
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  fclose(diskFile);
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  return 0;
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}

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