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[/] [eco32/] [trunk/] [disk/] [tools/] [mkdisk/] [mkdisk.c] - Blame information for rev 195

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Line No. Rev Author Line
1 17 hellwig
/*
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 * mkdisk.c -- make an empty physical 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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#define MIN_NUMBER_SECTORS      100
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#define SECTORS_PER_MB          ((1 << 20) / SECTOR_SIZE)
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#define DATA_BYTE               0xE5
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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(void) {
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  fprintf(stderr, "Usage: mkdisk <file name> <n>[M]\n");
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  fprintf(stderr, "       <n>: decimal number of sectors\n");
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  fprintf(stderr, "       if 'M' appended: megabytes instead of sectors\n");
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  fprintf(stderr, "       (sector size is always %d bytes)\n", SECTOR_SIZE);
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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 *dskFile;
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  int numSectors;
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  unsigned char sectorBuffer[SECTOR_SIZE];
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  int i;
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  if (argc != 3) {
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    usage();
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  }
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  numSectors = atoi(argv[2]);
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  i = strlen(argv[2]) - 1;
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  if (argv[2][i] == 'M') {
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    numSectors *= SECTORS_PER_MB;
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  }
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  if (numSectors < MIN_NUMBER_SECTORS) {
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    error("this disk is too small to be useful (minimum size is %d sectors)",
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          MIN_NUMBER_SECTORS);
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  }
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  dskFile = fopen(argv[1], "wb");
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  if (dskFile == NULL) {
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    error("cannot open file '%s' for write", argv[1]);
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  }
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  fprintf(stdout,
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          "Creating disk '%s' with %d sectors (around %d MB)...\n",
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          argv[1], numSectors,
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          (numSectors + SECTORS_PER_MB / 2) / SECTORS_PER_MB);
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  for (i = 0; i < SECTOR_SIZE; i++) {
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    sectorBuffer[i] = DATA_BYTE;
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  }
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  for (i = 0; i < numSectors; i++) {
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    if (fwrite(sectorBuffer, SECTOR_SIZE, 1, dskFile) != 1) {
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      error("write error on file '%s', sector %d", argv[1], i);
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    }
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  }
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  fclose(dskFile);
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  return 0;
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}

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