#include <ctype.h>
#include <stddef.h> /* NULL */
#include <stdio.h> /* fprintf(3) */
#include <string.h> /* strcmp(3) */
#if !defined EX_USAGE
#	include <sysexits.h>
#endif
#if defined INCLUDE_ISVALUE_C
#	include "isvalue.c"
/* This is a special addition to the command that lets `str isvalue "$input"`
 * function as a lightweight replacement to the common `test -n "$input"` or
 * `[ -n "$input" ]`. This will speed up your shellscript execution by a tad
 * ONLY if test(1) isn't already built into your shell (most of the time, it
 * is, and saves you the overhead of spawning a new process, which is greater
 * than the savings of switching from test(1) to this program). */
#endif

static char *program_name = "str";

static struct {
	char *name;
	int (*f)(int);
}ctypes[] = {
	{ "isalnum", isalnum },
	{ "isalpha", isalpha },
	{ "isblank", isblank },
	{ "iscntrl", iscntrl },
	{ "isdigit", isdigit },
	{ "isxdigit", isxdigit },
	{ "isgraph", isgraph },
	{ "islower", islower },
	{ "isprint", isprint },
	{ "ispunct", ispunct },
	{ "isspace", isspace },
	{ "isupper", isupper }
#if defined _isvalue_c
,	{ "isvalue", isvalue }
#endif
};

int main(int argc, char *argv[]){
	int ctype;
	int i;
	int r;

	if(argc < 3){
usage:		fprintf(stderr, "Usage: %s [type] [string...]\n",
			argv[0] == NULL ? program_name : argv[0]
		);
		return EX_USAGE;
	}

	for(ctype = 0; ctype < (sizeof(ctypes)/sizeof(ctypes[0])); ++ctype)
		if(strcmp(argv[1], ctypes[ctype].name) == 0)
			goto pass;
	goto usage;

pass:	for(argv += 2, r = 1; *argv != NULL; ++argv)
		for(i = 0; argv[0][i] != '\0'; ++i)
			/* First checks if argv[0][i] is valid ASCII; ctypes(3)
			 * don't handle non-ASCII.
			 * This is bad. */
			if(argv[0][i] < 0x80 && !ctypes[ctype].f(argv[0][i]))
				return 1;
			else
				r = 0;

	return r;
}