/* parser.c 
 * 
 * Use this to parse a plaintext file. It outputs the plaintext file
 * to stdout according to our plaintext conventions.
 */ 

#include <stdio.h>

void
PrintUsage()
{
	printf("Usage: parser infile\n");
}

main(int argc, char** argv)
{
	FILE* fin;
	char ch;

	if(argc < 2) { PrintUsage(); exit(1); }

	fin = fopen(argv[1], "r");
	if(!fin) { PrintUsage(); exit(1); }

	while((ch = (char)getc(fin)) != EOF)	
	{
		ch = (char)tolower(ch);
		if((ch >= 97 && ch <= 122) || (ch >= 48 && ch <= 57) || (ch == 32))
		{
			putc(ch, stdout);
		}
	}
}