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#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#define MAXLEN 1000
void flcmp(FILE *fp1, FILE *fp2);
int main(int argc, char *argv[])
{
FILE *fp1, *fp2;
if (argc != 3) {
fprintf(stderr, "Usgae: %s file1 file2\n", *argv);
return 1;
} else if (!(fp1 = fopen(argv[1], "r")) || !(fp2 = fopen(argv[2], "r"))) {
fprintf(stderr, "%s: unable to read files\n", *argv);
return 1;
} else {
flcmp(fp1, fp2);
return 0;
}
}
void flcmp(FILE *fp1, FILE *fp2)
{
char l1[MAXLEN], l2[MAXLEN];
char *lp1, *lp2;
do {
lp1 = fgets(l1, MAXLEN, fp1);
lp2 = fgets(l2, MAXLEN, fp2);
if (lp1 == l1 && lp2 == l2) {
if (strcmp(l1, l2)) {
printf("first difference in line\n%s\n", lp1);
lp1 = lp2 = NULL;
}
} else if (lp1 == NULL && lp2 == l2) {
printf("end of first file at line\n%s\n", lp2);
} else if (lp1 == l1 && lp2 == NULL) {
printf("end of first file at line\n%s\n", lp1);
}
} while (lp1 == l1 && lp2 == l2);
}
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