44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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int
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main(int argc, char *argv[]) {
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struct stat st;
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if (argc != 3) {
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fprintf(stderr, "Usage: <input filename> <output filename>\n");
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return -1;
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}
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if (stat(argv[1], &st) != 0) {
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fprintf(stderr, "Error opening file '%s': %s\n", argv[1], strerror(errno));
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return -1;
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}
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printf("'%s' size: %lld bytes\n", argv[1], (long long)st.st_size);
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if (st.st_size > 510) {
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fprintf(stderr, "%lld >> 510!!\n", (long long)st.st_size);
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return -1;
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}
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char buf[512];
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memset(buf, 0, sizeof(buf));
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FILE *ifp = fopen(argv[1], "rb");
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int size = fread(buf, 1, st.st_size, ifp);
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if (size != st.st_size) {
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fprintf(stderr, "read '%s' error, size is %d.\n", argv[1], size);
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return -1;
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}
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fclose(ifp);
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buf[510] = 0x55;
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buf[511] = 0xAA;
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FILE *ofp = fopen(argv[2], "wb+");
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size = fwrite(buf, 1, 512, ofp);
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if (size != 512) {
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fprintf(stderr, "write '%s' error, size is %d.\n", argv[2], size);
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return -1;
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}
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fclose(ofp);
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printf("build 512 bytes boot sector: '%s' success!\n", argv[2]);
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return 0;
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}
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