using these C libraries only
#include <stdio.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <sys/time.h>
(in C programing language) How do you use file I/O to read in one byte at a time, as in reading straight from the hard disk with buffers turned off? And once you have access to one byte how would you compare each byte in one file to another file?
I understand how you would do that if you had a buffer to store chars and them compare each character. But how would you do that for individual bytes and without a buffer?
#include <stdio.h>
void compare_two_binary_files(FILE *,FILE *);
int main(int argc, char *argv[])
{
FILE *fp1, *fp2;
if (argc < 3)
{
printf("\nInsufficient Arguments: \n");
printf("\nHelp:./executable <filename1> <filename2>\n");
return;
}
else
{
fp1 = fopen(argv[1], "r");
if (fp1 == NULL)
{
printf("\nError in opening file %s", argv[1]);
return;
}
fp2 = fopen(argv[2], "r");
if (fp2 == NULL)
{
printf("\nError in opening file %s", argv[2]);
return;
}
if ((fp1 != NULL) && (fp2 != NULL))
{
compare_two_binary_files(fp1, fp2);
}
}
}
/*
* compare two binary files character by character
*/
void compare_two_binary_files(FILE *fp1, FILE *fp2)
{
char ch1, ch2;
int flag = 0;
while (((ch1 = fgetc(fp1)) != EOF) &&((ch2 = fgetc(fp2)) != EOF))
{
/*
* character by character comparision
* if equal then continue by comparing till the end of files
*/
if (ch1 == ch2)
{
flag = 1;
continue;
}
/*
* If not equal then returns the byte position
*/
else
{
fseek(fp1, -1, SEEK_CUR);
flag = 0;
break;
}
}
if (flag == 0)
{
printf("Two files are not equal : byte poistion at which two files differ is %d\n", ftell(fp1)+1);
}
else
{
printf("Two files are Equal\n ", ftell(fp1)+1);
}
}
using these C libraries only #include <stdio.h> #include <sys/stat.h> #include <stdlib.h> #include <sys/time.h> (in C programing...