133 lines
2.5 KiB
C
133 lines
2.5 KiB
C
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdarg.h>
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#include <libgen.h>
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#include <errno.h>
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typedef struct
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{
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uint8_t jmp[3];
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uint8_t OEM[8];
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uint16_t bytes_per_sector;
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uint8_t sectors_per_cluster;
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uint16_t reserved_sectors;
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uint8_t number_of_FATs;
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uint16_t root_entries;
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uint16_t logical_sectors;
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uint8_t media_descriptor;
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uint16_t sectors_per_FAT;
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uint16_t sectors_per_track;
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uint16_t heads_per_cylinder;
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uint32_t hidden_sectors;
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uint32_t total_sectors;
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/* EBPB */
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uint8_t drive_number;
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uint8_t flags;
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uint8_t signature;
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uint32_t serial;
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uint8_t label[11];
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uint8_t fs_type[8];
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} __attribute__((packed)) BiosParamBlock;
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static const char *prg_name;
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static void
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fatal(const char *str, ...)
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{
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va_list ap;
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fprintf(stderr, "%s: ", prg_name);
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va_start(ap, str);
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vfprintf(stderr, str, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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exit(EXIT_FAILURE);
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}
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static void
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dump(const char *img)
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{
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FILE *fp;
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BiosParamBlock bpb;
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char label[12];
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fp = fopen(img, "rb");
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if (fp == NULL) fatal("Can't open '%s': %s", img, strerror(errno));
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if (fread(&bpb, 1, sizeof(BiosParamBlock), fp) != sizeof(BiosParamBlock))
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{
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fatal("Can't read BPB");
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}
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printf("Bytes per logical sector: %hd\n", bpb.bytes_per_sector);
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printf("Logical sectors per cluster: %d\n", bpb.sectors_per_cluster);
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memset(label, 0, 12);
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strncpy(label, bpb.label, 11);
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printf("Label: '%s'\n", label);
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printf("signature: %X\n", bpb.signature);
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fclose(fp);
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exit(EXIT_SUCCESS);
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}
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static void
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usage(int retcode)
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{
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if (retcode == EXIT_FAILURE)
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{
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fprintf(stderr, "Try '%s -h' form more information.\n", prg_name);
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}
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else
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{
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printf("Usage: %s [-hV] [-D IMG] [-b BIN]\n", prg_name);
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printf("\t-h\tdisplay this help and exit\n");
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printf("\t-V\toutput version information\n");
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printf("\t-D IMG\tdump fs information from IMG\n");
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printf("\nReport bugs to <%s>\n", MK_BUGREPORT);
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}
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exit(retcode);
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}
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static void
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version(void)
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{
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printf("%S commit %s\n", prg_name, MK_COMMIT);
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exit(EXIT_SUCCESS);
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}
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int
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main(int argc, char **argv)
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{
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prg_name = argv[0];
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while ((argc > 1) && (argv[1][0] == '-'))
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{
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switch (argv[1][1])
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{
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case 'h':
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usage(EXIT_SUCCESS);
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break;
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case 'V':
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version();
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break;
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case 'D':
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argv++;
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argc--;
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if (argc <= 1) usage(EXIT_FAILURE);
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dump(argv[1]);
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break;
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default:
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usage(EXIT_FAILURE);
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break;
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}
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argv++;
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argc--;
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}
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return (EXIT_SUCCESS);
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}
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