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[/] [eco32/] [trunk/] [simtest/] [disk/] [wrtmbr/] [wrtmbr.c] - Rev 130
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/* * wrtmbr.c -- write the master boot record to the disk */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdarg.h> #define SECTOR_SIZE 512 void error(char *fmt, ...) { va_list ap; va_start(ap, fmt); fprintf(stderr, "Error: "); vfprintf(stderr, fmt, ap); fprintf(stderr, "\n"); va_end(ap); exit(1); } void usage(char *myself) { fprintf(stderr, "Usage: %s <disk file> <master boot record file>\n", myself); exit(1); } int main(int argc, char *argv[]) { FILE *diskFile; FILE *bootFile; unsigned char sectorBuffer[SECTOR_SIZE]; if (argc != 3) { usage(argv[0]); } diskFile = fopen(argv[1], "r+b"); if (diskFile == NULL) { error("cannot open disk file '%s'", argv[1]); } bootFile = fopen(argv[2], "rb"); if (bootFile == NULL) { error("cannot open boot sector file '%s'", argv[2]); } if (fseek(bootFile, 0, SEEK_END) != 0) { error("cannot position to end of boot sector file"); } if (ftell(bootFile) != SECTOR_SIZE) { error("'%s' is not a proper boot sector file (wrong length)", argv[2]); } if (fseek(bootFile, 0, SEEK_SET) != 0) { error("cannot position to start of boot sector file"); } if (fread(sectorBuffer, SECTOR_SIZE, 1, bootFile) != 1) { error("cannot read data from boot sector file"); } fclose(bootFile); if (sectorBuffer[SECTOR_SIZE - 2] != 0x55 || sectorBuffer[SECTOR_SIZE - 1] != 0xAA) { error("'%s' is not a proper boot sector file (no signature)", argv[2]); } if (fseek(diskFile, 0, SEEK_SET) != 0) { error("cannot position to start of disk file"); } if (fwrite(sectorBuffer, 1, SECTOR_SIZE, diskFile) != SECTOR_SIZE) { error("cannot write boot sector to disk file"); } fclose(diskFile); return 0; }
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