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[/] [eco32/] [tags/] [eco32-0.23/] [disk/] [tools/] [mkdisk/] [mkdisk.c] - Rev 160
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/* * mkdisk.c -- make an empty physical disk */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdarg.h> #define SECTOR_SIZE 512 #define MIN_NUMBER_SECTORS 100 #define SECTORS_PER_MB ((1 << 20) / SECTOR_SIZE) #define DATA_BYTE 0xE5 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(void) { fprintf(stderr, "Usage: mkdisk <file name> <n>[M]\n"); fprintf(stderr, " <n>: decimal number of sectors\n"); fprintf(stderr, " if 'M' appended: megabytes instead of sectors\n"); fprintf(stderr, " (sector size is always %d bytes)\n", SECTOR_SIZE); exit(1); } int main(int argc, char *argv[]) { FILE *dskFile; int numSectors; unsigned char sectorBuffer[SECTOR_SIZE]; int i; if (argc != 3) { usage(); } numSectors = atoi(argv[2]); i = strlen(argv[2]) - 1; if (argv[2][i] == 'M') { numSectors *= SECTORS_PER_MB; } if (numSectors < MIN_NUMBER_SECTORS) { error("this disk is too small to be useful (minimum size is %d sectors)", MIN_NUMBER_SECTORS); } dskFile = fopen(argv[1], "wb"); if (dskFile == NULL) { error("cannot open file '%s' for write", argv[1]); } fprintf(stdout, "Creating disk '%s' with %d sectors (around %d MB)...\n", argv[1], numSectors, (numSectors + SECTORS_PER_MB / 2) / SECTORS_PER_MB); for (i = 0; i < SECTOR_SIZE; i++) { sectorBuffer[i] = DATA_BYTE; } for (i = 0; i < numSectors; i++) { if (fwrite(sectorBuffer, SECTOR_SIZE, 1, dskFile) != 1) { error("write error on file '%s', sector %d", argv[1], i); } } fclose(dskFile); return 0; }
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