argparse.c

#include "argparse.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
 
#define FLAG_LENGTH 2
#define MAX_CONTENT_LENGTH 2048
 
FLAG_TYPE get_flag(char* flag_string)
{
  const size_t ARG_FLAG_LENGTH = strnlen(flag_string, FLAG_LENGTH);
  if (flag_string == NULL || ARG_FLAG_LENGTH != 2)
  {
    printf("Flag error: empty or malformed flag (len: %zu)\n", ARG_FLAG_LENGTH);
    return FLAG_INVALID; 
  }
 
  if ( strncmp( flag_string, "-c", ARG_FLAG_LENGTH ) == 0 )
  {
    return FLAG_CREATE;
  } 
  else if ( strncmp ( flag_string, "-r", ARG_FLAG_LENGTH) == 0 )
  {
    return FLAG_REMOVE;
  }
  else if ( strncmp ( flag_string, "-m", ARG_FLAG_LENGTH) == 0 )
  {
    return FLAG_MODIFY;
  }
  else if ( strncmp ( flag_string, "-l", ARG_FLAG_LENGTH) == 0 )
  {
    return FLAG_LIST;
  }
 
  return FLAG_INVALID;
}
 
const char* get_content_arg(char* str_arg)  // just a safety wrapper around strncpy
{
  size_t arg_len = strnlen(str_arg, MAX_CONTENT_LENGTH); 
  char* ret = (char*)malloc(arg_len+1); // +1 for null term
  strncpy(ret, str_arg, arg_len+1);
  return ret;
}