#ifndef STD_LIB_H
#define STD_LIB_H
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<stdbool.h>
#include<math.h>
#include<time.h>
#include<ctype.h>
#include <stddef.h>
#endif
void welcome_message(){
    printf("><Welcome to the Student Union POS system><\n");//welcome messgae
}

int choices_selecter(char * Items[],int items,char * welcome_messages ){
  int choice = 0;
  do{
  	system("cls");

    if (welcome_messages !=NULL){
    	printf("%s",welcome_messages);
	}
	printf("Select An Option:\n");
    int i;
    for (i=0; i<items;i++){
      printf("%d. %s\n",i+1,Items[i]);
    }
    printf("%d. Exit\n",i+1);
    printf(">");
  	fflush(stdin);
    scanf("%d",&choice);
    if(choice < 1 || choice > items+1){
        printf("Invalid choice...press any key to retry....\n");
        fflush(stdin);
        getchar();
    }
  }while(choice < 1 || choice > items+1);
  return choice;

} 
//check if strcasestr is define in current environment
//if not, define it
#ifndef HAVE_STRCASESTR
char *strcasestr(const char *s, const char *find)
{
char c, sc;
size_t len;

if ((c = *find++) != 0) {
c = tolower((unsigned char)c);
len = strlen(find);
do {
do {
if ((sc = *s++) == 0)
return (NULL);
} while ((char)tolower((unsigned char)sc) != c);
} while (strncasecmp(s, find, len) != 0);
s--;
}
return ((char *)s);
}
#endif