This is a little tool to count the Lines, Digts Words, Chars, UpperCase and LowerCase chars in a file.

Code:
// File : ts.c
// By   : Ben a.k.a DreamVB
// Date : 20:50 26/05/2020
// Info : Little tool to count the Lines, Digts Words, Chars, UpperCase and LowerCase chars in a file.
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

int m_words = 0;
int m_chars = 0;
int m_upper = 0;
int m_lower = 0;
int m_lines = 0;
int m_digits = 0;

int _countUpper(char *src){
int x  = 0;
int u = 0;
    while(x < strlen(src)){
        //Check if we have an alpha
        if(isalpha(src[x])){
            if(isupper(src[x])){
               u++;
            }
        }
        x++;
    }
    return u;
}

int _countLower(char *src){
int x  = 0;
int l = 0;
    while(x < strlen(src)){
        //Check if we have an alpha
        if(isalpha(src[x])){
            if(islower(src[x])){
               l++;
            }
        }
        x++;
    }
    return l;
}

int main(int argc, char *argv[])
{
    FILE *fp = NULL;
    char ch = '\0';
    char lzBuffer[30];
    int x = 0;

    if(argc != 2){
        printf("Source File Not Found.\n");
        printf("    Usage: ts Filename\n");
        return 0;
    }
    //Open file
    fp = fopen(argv[1],"r");

    if(fp == NULL){
        printf("Cannot Read Source File:\n");
        printf(argv[1]);
    }
    //While not end of file read it
    while(!feof(fp)){
        //Get current char from file.
        ch = fgetc(fp);
        //Count digits
        if(isdigit(ch)){
            m_digits++;
        }
        //Count number of lines
        if(ch == '\n' || ch == '\0'){
            m_lines++;
        }
        //Check if end of file.
        if(!feof(fp)){
            //Check for space char
            if((ch == 32) || (ch == 9)){
                //Set end of string buffer.
                lzBuffer[x] = '\0';
                //Check length of string
                if(strlen(lzBuffer) > 0 ){
                    //INC word counter
                    m_words++;
                    //INC number of chars in lzBuffer
                    m_chars+= strlen(lzBuffer);
                    //INC upper.
                    m_upper+= _countUpper(lzBuffer);
                    //INC lower.
                    m_lower+= _countLower(lzBuffer);
                }
                //Reset x
                x = 0;
            }else{
                //Collect chars for string buffer.
                lzBuffer[x] = ch;
                //INC buffer char
                x+=1;
            }
        }
    }
    //Set end of string buffer
    lzBuffer[x] = '\0';
    //Check length of string
    if(strlen(lzBuffer) > 0 ){
        //INC word counter
        m_words++;
        //INC number of chars in lzBuffer
        m_chars+= strlen(lzBuffer);
        //INC upper
        m_upper+= _countUpper(lzBuffer);
        //INC lower
        m_lower+= _countLower(lzBuffer);
    }
    //Close file
    fclose(fp);
    //Print stats of Words and Chars

    printf("Lines     : %d\n",m_lines);
    printf("Digits    : %d\n",m_digits);
    printf("Words     : %d\n",m_words);
    printf("Chars     : %d\n",m_chars);
    printf("UpperCase : %d\n",m_upper);
    printf("LowerCase : %d\n",m_lower);

    //Clear array
    memset(lzBuffer,0,sizeof lzBuffer);

    return 0;
}
How to use

Code:
./ts example.c "printf"