75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
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/*
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* C Program to Compare two Binary Files, Printing the First Byte
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* Position where they Differ
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*/
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#include <stdio.h>
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void compare_two_binary_files(FILE *,FILE *);
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int main(int argc, char *argv[])
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{
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FILE *fp1, *fp2;
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if (argc < 3)
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{
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printf("\nInsufficient Arguments: \n");
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printf("\nHelp:./executable <filename1> <filename2>\n");
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return;
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}
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else
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{
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fp1 = fopen(argv[1], "r");
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if (fp1 == NULL)
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{
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printf("\nError in opening file %s", argv[1]);
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return;
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}
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fp2 = fopen(argv[2], "r");
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if (fp2 == NULL)
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{
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printf("\nError in opening file %s", argv[2]);
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return;
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}
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if ((fp1 != NULL) && (fp2 != NULL))
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{
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compare_two_binary_files(fp1, fp2);
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}
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}
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}
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/*
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* compare two binary files character by character
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*/
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void compare_two_binary_files(FILE *fp1, FILE *fp2)
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{
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char ch1, ch2;
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int flag = 0;
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while (((ch1 = fgetc(fp1)) != EOF) &&((ch2 = fgetc(fp2)) != EOF))
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{
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/*
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* character by character comparision
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* if equal then continue by comparing till the end of files
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*/
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if (ch1 == ch2)
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{
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flag = 1;
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continue;
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}
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/*
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* If not equal then returns the byte position
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*/
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else
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{
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fseek(fp1, -1, SEEK_CUR);
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flag = 0;
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break;
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}
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}
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if (flag == 0)
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{
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printf("Two files are not equal : byte poistion at which two files differ is %d\n", ftell(fp1)+1);
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}
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else
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{
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printf("Two files are Equal\n ", ftell(fp1)+1);
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}
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}
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