#include <sys/types.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdio.h>
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#include <string.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdlib.h>
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int main(int argc, char *argv[])
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int main(int argc, char *argv[])
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{
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{
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int f1, f2, c1, c2;
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int f1, f2, c1, c2;
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char err[50];
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char err[50];
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unsigned char *buf1, *buf2;
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unsigned char *buf1, *buf2;
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if (argc!=3)
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if (argc!=3)
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{
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{
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sprintf(err, "Usage: %s hdnew.img hdref.img\n", argv[0]);
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sprintf(err, "Usage: %s hdnew.img hdref.img\n", argv[0]);
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write(2, &err, strlen(err));
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write(2, &err, strlen(err));
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exit(1);
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exit(1);
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}
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}
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f1 = open (argv[1], O_RDONLY);
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f1 = open (argv[1], O_RDONLY);
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if (f1<0)
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if (f1<0)
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{
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{
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sprintf(err, "Could not open file %s\n", argv[1]);
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sprintf(err, "Could not open file %s\n", argv[1]);
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write(2, &err, strlen(err));
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write(2, &err, strlen(err));
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exit(1);
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exit(1);
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}
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}
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f2 = open (argv[2], O_RDONLY);
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f2 = open (argv[2], O_RDONLY);
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if (f2<0)
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if (f2<0)
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{
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{
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sprintf(err, "Could not open file %s\n", argv[2]);
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sprintf(err, "Could not open file %s\n", argv[2]);
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write(2, &err, strlen(err));
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write(2, &err, strlen(err));
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exit(1);
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exit(1);
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}
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}
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buf1 = malloc(131072);
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buf1 = malloc(131072);
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if (!buf1)
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if (!buf1)
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{
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{
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sprintf(err, "Could not allocate 128kb of memory for the 1st buffer\n");
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sprintf(err, "Could not allocate 128kb of memory for the 1st buffer\n");
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write(2, &err, strlen(err));
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write(2, &err, strlen(err));
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exit(1);
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exit(1);
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}
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}
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buf2 = malloc(131072);
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buf2 = malloc(131072);
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if (!buf2)
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if (!buf2)
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{
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{
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sprintf(err, "Could not allocate 128kb of memory for the 2nd buffer\n");
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sprintf(err, "Could not allocate 128kb of memory for the 2nd buffer\n");
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write(2, &err, strlen(err));
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write(2, &err, strlen(err));
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exit(1);
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exit(1);
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}
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}
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c1=read(f1, &buf1, 131072); // 128kb block
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c1=read(f1, &buf1, 131072); // 128kb block
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c2=read(f2, &buf2, 131072);
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c2=read(f2, &buf2, 131072);
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memcmp (buf1, buf2, 131072);
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memcmp (buf1, buf2, 131072);
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return 0;
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return 0;
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