/prog/ - Programming

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

#define VERSION "0.2"
#define AUTHORS "O.P. Faggot"

void help(char * reason)
{
	fprintf(stdout, "%s\nkutils 'print' v%s authored by: %s\nusage: print "
	"[<-n> <-s '?'>] <variable>…\ndescrip: prints arguments to the screen	"
	"in the order they are given\noptions:\n-n\tdoes not print newline after "
	"all arguments.\n-s '?'\tprints with separator '?' between each argument; "
	"defaults to space.\n", reason, VERSION, AUTHORS);
}

int main(int argc, char **argv)
{
	//ensure that argc is not 0 (possibility due to C11),
	//quick finish no args for echo-like behaviour (argc == 1)
	switch (argc)
	{
		case 0:
		{
			return 0;
		}
		case 1:
		{
			fputc('\n', stdout);
			return 0;
		}
	}
	argc–;
	argv++;

	char print_newline = 1;
	char separator = ' ';

	//check for program info args
	if (!strcmp(argv[0], "–help"))
	{
		help("");
		return 0;
	}
	else if (!strcmp(argv[0], "–version"))
	{
		printf("kutils print v%s\n", VERSION);
		return 0;
	}

	//check for no newline and separator arg
	while ((argc != 0) && (argv[0][0] == '-'))
	{
		switch(argv[0][1])
		{
			case 'n':
			{
				print_newline = 0;
				break;
			}
			case 's':
			{
				if ((argv[0][2] != '\0') && !argv[0][3])
				{
					separator =  argv[0][2];
					break;
				}
				argc–;
				argv++;
				if (!argv[0][1])
				{
					separator = argv[0][0];
					break;
				}
				//else falls into error below
			}
			default:
			{
				help("Invalid argument");
				return 0;
			}
		}
		argc–;
		argv++;
	}

	// print all args separated by separator
	while (1)
	{
		fputs(argv[0], stdout);
		argc–;
		argv++;
		if (argc == 0) break;
		fputc(separator, stdout);
	}
	// print newline at end if not specified otherwise
	if (print_newline) {
		fputc('\n', stdout);
	}
	
	return 0;
}