eat.street.c

/**
 *
 * Copyright (c) 2015 Ryan McCullagh <me@ryanmccullagh.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */


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

int main(void)
{

	char c;
	char buffer[1024];
	size_t i = 0;

	
	typedef struct my_char {
		int n;	// ASCII UPPER CASE 65:65+26
		int count;
	} my_char;

	my_char alphabet[65 + 26];

	int b;
	for(b = 0; b < (65 + 26); b++) {
		my_char item = {0, 0};
		alphabet[b] = item;
	}


	/* 
         * check if char is between alphabet range
         * conver to int, subtract 1, increment at index converted to int
 	 * loop through all to check that if any index value is zero, we failed, else OK 
	 */
	
	while((c = fgetc(stdin)) != -1) {
		/* end of line, or c would be equal to the length */
		/* can't push anymore, because sizeof(buffer) - 1 is for '\0' */
		if(c == '\n' || i == sizeof(buffer) - 1) {
			
			buffer[i] = '\0';
			
			size_t len = strlen(buffer);

			size_t j;

			for(j = 0; j < len; j++) {
				char cc = buffer[j];

				if((cc <= 'Z' && cc >= 'A') || (cc <= 'z' && cc >= 'a')) {	
					int ccc = toupper((int)cc);
					if(alphabet[ccc - 1].count) {
						my_char item = {ccc, ++alphabet[ccc-1].count};
						alphabet[ccc - 1] = item;
					} else {
						my_char item = {ccc, 1};
						alphabet[ccc - 1] = item;
					}
				}
			}				



			int a;
			int failed = 0;
			for(a = 64; a < (65+26)-1; a++) {
				if(!alphabet[a].n) {
					failed = 1;
					break;
					printf("%c:%d\n", (char)alphabet[a].n, alphabet[a].count);
				}
			}
			
			if(failed)
				printf("Not a valid input\n");
			else
				printf("This is a valid input\n");

			memset(buffer, '\0', sizeof(buffer));

			i = 0;

			for(a = 0; a < (65+26); a++) {
				my_char new_item = {0, 0};
				alphabet[a] = new_item;
			}


		} else {
			buffer[i++] = c;
		}
	}

			
	return 0;
}