The number of characters of comments in a file (C programming)

Question

I can\'t seem to get it right, tried everything, but..

int commentChars() {
char str[256], fileName[256];
FILE *fp;
int i;


do{
    long commentCount=0;
    ffl         


        

Answer 1

#include 

size_t counter(FILE *fp){
    int ch, chn;
    size_t count = 0;
    enum { none, in_line_comment, in_range_comment, in_string, in_char_constant } status;
#if 0
    in_range_comment : /* this */
    in_line_comment  : //this
    in_string : "this"
    in_char_constnt : ' '
#endif

    status = none;
    while(EOF!=(ch=fgetc(fp))){
        switch(status){
        case in_line_comment :
            if(ch == '\n'){
                status = none;
            }
            ++count;
            continue;
        case in_range_comment :
            if(ch == '*'){
                chn = fgetc(fp);
                if(chn == '/'){
                    status  = none;
                    continue;
                }
                ungetc(chn, fp);
            }
            ++count;
            continue;
        case in_string :
            if(ch == '\\'){
                chn = fgetc(fp);
                if(chn == '"'){
                    continue;
                }
                ungetc(chn, fp);
            } else {
                if(ch == '"')
                    status = none;
            }
            continue;
        case in_char_constant :
            if(ch == '\\'){
                chn = fgetc(fp);
                if(chn == '\''){
                    continue;
                }
                ungetc(chn, fp);
            } else {
                if(ch == '\'')
                    status = none;
            }
            continue;
        case none :
            switch(ch){
            case '/':
                if('/' == (chn = fgetc(fp))){
                    status = in_line_comment;
                    continue;
                } else if('*' == chn){
                    status = in_range_comment;
                    continue;
                } else
                    ungetc(chn, fp);
                break;
            case '"':
                status = in_string;
                break;
            case '\'':
                status = in_char_constant;
                break;
            }
        }
    }
    return count;
}

int main(void){
    FILE *fp = stdin;
    size_t c = counter(fp);
    printf("%lu\n", c);

    return 0;
}