printf project resources

#include <stdio.h>
#include <stdarg.h>
#include <string.h>

// You can write your own low level function to write to display or hardware
void local_put(char c){
  putchar(c);
}

void decimal_to_baseN(char *converted, unsigned int num, int base)
{
  if (num == 0) {
    converted[0] = '0';
    converted[1] = '\0';
    return;
  }
  int MAX_REP_LEN = 250;
  char NUM_BASE[] = "0123456789ABCDEF";
  char buffer[MAX_REP_LEN];

  int i = MAX_REP_LEN - 1;
  while (num != 0) {
    buffer[i--] = NUM_BASE[num % base];
    num /= base;
  }
  int counter = 0;
  for (int j = i + 1; j <= MAX_REP_LEN - 1; j++) {
    converted[counter++] = buffer[j];
  }
  converted[counter] = '\0';
}


void my_print(char *c, ...)
{
  int num;
  va_list arg;
  va_start(arg, c);
  char outbuf[2048];
  int i;
  char *ch;
  double db_val;
  unsigned int uint_val;
  while(*c!='\0'){
    if(*c=='%'){
      c++; // To incement to the formating character
      // processing the formatting character
      switch(*c){
        case 'b':
        case 'B':
        case 'h':
        case 'H':
        case 'O':
        case 'o':
        case 'd':
        case 'D':
        case 'i':
        case 'I':
          num = va_arg(arg, int);
          if(num<0){
            // Simple - sign is used instead of 2s complement
            local_put('-');
            num = num * -1;
          }
          if(*c=='b' || *c=='B'){
            decimal_to_baseN(outbuf, num, 2);
          }else if(*c=='o' || *c=='O'){
            decimal_to_baseN(outbuf, num, 8);
          }else if(*c=='d' || *c=='D'){
            decimal_to_baseN(outbuf, num, 10);
          }else if(*c=='h' || *c=='H'){
            decimal_to_baseN(outbuf, num, 16);
          }

          for(int i=0;outbuf[i]!='\0';i++){
            local_put(outbuf[i]);
          }
        break;

        case 'c':
        case 'C':
          num = va_arg(arg, int);
          local_put(num);
        break;

        case 's':
        case 'S':
          ch = va_arg(arg, char*);
          while(*ch!='\0'){
            local_put(*ch++);
          }
        break;

        case 'f':
        case 'F':
          db_val = va_arg(arg, double);
          sprintf(outbuf, "%f", db_val);
          for(int i=0;outbuf[i]!='\0';i++){
            local_put(outbuf[i]);
          }
        break;

        case 'u':
        case 'U':
          uint_val = va_arg(arg, unsigned int);
          sprintf(outbuf, "%u", uint_val);
          for(int i=0;outbuf[i]!='\0';i++){
            local_put(outbuf[i]);
          }
        break;
      }
    }else{
      local_put(*c);   
    }
    c++;
  }
  va_end(arg);
}

int main()
{
  int num = 100;
  my_print("The Decimal: %d\r\n", num);
  my_print("The Unsigned int: %u\r\n", 4294967295);
  my_print("The Binary: %b\r\n", num);
  my_print("The Octel: %o\r\n", num);
  my_print("The Hex: %h\r\n", 999);
  my_print("The Character: %c\r\n", 'C');
  my_print("The String: %s\r\n", "Annie");
  my_print("The Float: %f\r\n", 4.35);
  return 0;
}