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[/] [eco32/] [tags/] [eco32-0.22/] [disk/] [tools/] [shpart/] [shpart.c] - Rev 148
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/* * shpart.c -- show partitions on a disk */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdarg.h> #define SECTOR_SIZE 512 #define NPE (SECTOR_SIZE / sizeof(PartEntry)) #define DESCR_SIZE 20 typedef struct { unsigned long type; unsigned long start; unsigned long size; char descr[DESCR_SIZE]; } PartEntry; PartEntry ptr[NPE]; /**************************************************************/ void error(char *fmt, ...) { va_list ap; va_start(ap, fmt); printf("Error: "); vprintf(fmt, ap); printf("\n"); va_end(ap); exit(1); } /**************************************************************/ unsigned long getNumber(unsigned char *p) { return (unsigned long) *(p + 0) << 24 | (unsigned long) *(p + 1) << 16 | (unsigned long) *(p + 2) << 8 | (unsigned long) *(p + 3) << 0; } void convertPartitionTable(PartEntry *e, int n) { int i; unsigned char *p; for (i = 0; i < n; i++) { p = (unsigned char *) &e[i]; e[i].type = getNumber(p + 0); e[i].start = getNumber(p + 4); e[i].size = getNumber(p + 8); } } /**************************************************************/ int main(int argc, char *argv[]) { char *diskName; FILE *disk; unsigned long diskSize; unsigned long numSectors; unsigned long partLast; int i, j; char c; /* check command line arguments */ if (argc != 2) { printf("Usage: %s <disk image file>\n", argv[0]); exit(1); } diskName = argv[1]; /* determine disk size */ disk = fopen(diskName, "rb"); if (disk == NULL) { error("cannot open disk image '%s'", diskName); } fseek(disk, 0, SEEK_END); diskSize = ftell(disk); numSectors = diskSize / SECTOR_SIZE; fclose(disk); printf("Disk '%s' has %lu (0x%lX) sectors.\n", diskName, numSectors, numSectors); if (numSectors < 32) { error("disk is too small"); } if (diskSize % SECTOR_SIZE != 0) { printf("Warning: disk size is not a multiple of sector size!\n"); } /* read partition table record */ disk = fopen(diskName, "rb"); if (disk == NULL) { error("cannot open disk image '%s'", diskName); } fseek(disk, 1 * SECTOR_SIZE, SEEK_SET); if (fread(ptr, 1, SECTOR_SIZE, disk) != SECTOR_SIZE) { error("cannot read partition table from disk image '%s'", diskName); } fclose(disk); convertPartitionTable(ptr, NPE); /* show partition table */ printf("Partitions:\n"); printf(" # b type start last size description\n"); for (i = 0; i < NPE; i++) { if (ptr[i].type != 0) { partLast = ptr[i].start + ptr[i].size - 1; } else { partLast = 0; } printf("%2d %s 0x%08lX 0x%08lX 0x%08lX 0x%08lX ", i, ptr[i].type & 0x80000000 ? "*" : " ", ptr[i].type & 0x7FFFFFFF, ptr[i].start, partLast, ptr[i].size); for (j = 0; j < DESCR_SIZE; j++) { c = ptr[i].descr[j]; if (c == '\0') { break; } if (c >= 0x20 && c < 0x7F) { printf("%c", c); } else { printf("."); } } printf("\n"); } /* done */ return 0; }
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