How to count statements in C ignoring the comments - count

Question

int Emptylines(FILE *fp);
int Numberofstatements(FILE *fp);
int main() {
FILE *fp = NULL;
FILE *fp1 = NULL;
int n1, n2;
char fname[255], fname1[255];
printf("Enter file name for reading");
fflush(stdin);
scanf("%s", &fname);
fp = fopen(fname, "r");
if (fp == NULL) {
printf("File with name %s couldn't be open", fname);
exit(1);
}
n1 = Emptylines(fp); // this is for empty lines
n2 = Numberofstatements(fp);
printf("Insert file name for writing");
fflush(stdin);
scanf("%s", &fname1);
fp1 = fopen(fname1, "w+");
fprintf(fp1, "The number of empty lines=%d", n1);
fprintf(fp1, "The number of statements=%d", n2);
fclose(fp);
fclose(fp1);
return 0;
}
int Numberofstatements(FILE *fp) {
char line[128];
int nofstatements = 0;
while (fgets(line, sizeof line, fp) != NULL) {
if (strstr(line, "if") != 0)
nofstatements++;
}
return nofstatements;
}
I need to count all statements like if, do, while, break, etc. as well as empty lines and then save the result in a new file. I succeed in counting the empty lines but I have no idea how to count the statements. I tried 2 different ways but both failed.
I also need to ignore comments while reading the code, so if there is a for, while, etc. in the comments it shouldn't be counted.

Answer 1

A very basic answer addressing the fundamental issue (although there are others).
When you call int Numberofstatements(FILE *fp) you already reached the end of file in int Emptylines(FILE *fp); so you must add the statement
rewind(fp);
before trying to parse the file for a second time. Good luck with developing this.

Answer 2

OP asks: "Any ideas ?"
To do properly, suggest reading 1 char at a time. Keep track if you are in 1) on an include line, 2) inside a " " 3) inside a ' ' 4) in a // comment 5) inside a /* comment or 6) just plain code (watch for escape sequences). When in plain code look for the keywords do, while, etc. and all the while count the '\n'.
To do correctly - this is not an easy task - about 10x the code you have posted.
Sample beginning of a state machine.
state = plaincode;
while ((c = getc()) != EOF) {
switch (state) {
slashslash_commnet:
if (c == '\n) state = plaincode;
break;
plaincode:
if (c == '/') {
c2 = getc();
if (c2 == '/') { state = slashslash_commnet; break; }
else if (c2 == '*') { state = slashstar_commnet: break; }
else unget(c2);
else if (c == '\"') {
...