first_word

Assignment name  : first_word
Expected files   : first_word.c
Allowed functions: write
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Write a program that takes a string and displays its first word, followed by a
newline.

A word is a section of string delimited by spaces/tabs or by the start/end of
the string.

If the number of parameters is not 1, or if there are no words, simply display
a newline.

Examples:

$> ./first_word "FOR PONY" | cat -e
FOR$
$> ./first_word "this        ...       is sparta, then again, maybe    not" | cat -e
this$
$> ./first_word "   " | cat -e
$
$> ./first_word "a" "b" | cat -e
$
$> ./first_word "  lorem,ipsum  " | cat -e
lorem,ipsum$
$>

#include <unistd.h>

void	first_word(char *str)
{
	while (*str == ' ' || *str == '\t')
		++str;
	while (*str != '\0' && *str != ' ' && *str != '\t')
	{
		write(1, str, 1);
		++str;
	}
}

int		main(int argc, char **argv)
{
	if (argc == 2)
		first_word(argv[1]);

	write(1, "\n", 1);
	return (0);
}