Process

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>

void handle_file(char* filename) {
    int sentences = 0;
    int commas = 0;

    int f = open(filename, O_RDONLY);
    char buff[200];
    int read_bytes;

    // Workaround
    char previous_char = '.';
    // A sentence. Another, one...
    while((read_bytes = read(f, buff, 200)) > 0) {
        int i; // read_bytes = 50
        for(i = 0; i < read_bytes; i++) {
            if(buff[i] == '.' && previous_char != '.')
                sentences++;
            else if(buff[i] == ',')
                commas++;

            previous_char = buff[i];

            if(write(STDOUT_FILENO, &buff[i], 1) < 0)
                perror("Write error");
        }
    }

    if(read_bytes != 0)
        perror("Read error");

    close(f);
    printf("\nCommas: %d\nSentences: %d\n", commas, sentences);
}

// argc - ARGument Count
// argv - ARGument Values

int main(int argc, char** argv) {
    int pids[argc - 1];

    int i;
    for(i = 1; i < argc; i++) {
        pids[i - 1] = fork();

        if(pids[i - 1] < 0)
        {
            perror("Fork error");
        }
        else if(pids[i - 1] == 0)
        {
            handle_file(argv[i]);
            return 0;
        }
    }

    for(i = 1; i < argc; i++)
        wait(NULL);

    return 0;
}