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

/**
 * xstring - bounded string builder with three valued comparator
 *
 * xstring handles string concatenation to a buffer, flagging truncation.
 * Additions can be transactional, where the addition wholly succeeds or the buffer is reterminated at its prior length.
 * Once flagged, no further additions are allowed.
 * Clearing reuses the buffer from the beginning.
 *
 * When comparing two xstrings, the truncation state is taken into account.
 * If either is truncated, an equality test returns unknown (-1).
 * Testing if x contains y returns unknown (-1) if y is truncated.
 * If x is whole, the test returns true (1) or false (0) appropriately.
 * If x is truncated, the test returns true (1) if the known portion of x contains y, and unknown (-1) otherwise.
 *
 * The structure members are intended for direct access.
 *
 * Example:
 *	// demo - break long lines
 *	#include <string.h>
 *	#include <stdio.h>
 *	#include <unistd.h>
 *	#include <err.h>
 *	#include <fcntl.h>
 *	#include <sys/types.h>
 *	#include <sys/stat.h>
 *	#include <sys/mman.h>
 *
 *	#include "ccan/xstring/xstring.h"
 *
 *	#define MAXLEN 80
 *	#define MARGIN 10
 *	int main(int argc, char *argv[])
 *	{
 *		char buf[BUFSIZ];
 *		xstring _x, *x = &_x;
 *		struct stat sb;
 *		int fd, span, lnlen;
 *		char *map, *p, *q;
 *
 *		xstrInit(x, buf, sizeof(buf), 0);
 *		assert(sizeof(buf) > MAXLEN);
 *
 *		if (argc != 2) return 1;
 *
 *		if ((fd = open(argv[1], O_RDONLY)) == -1)
 *			err(1, "open");
 *		if (fstat(fd, &sb) == -1)
 *			err(1, "stat");
 *		if ((map = mmap(NULL, sb.st_size + 1, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0)) == MAP_FAILED)
 *			err(1, "mmap");
 *		map[sb.st_size] = '\n';
 *
 *		for (p = map, lnlen = 0; p < map + sb.st_size; ) {
 *			span = strcspn(p, " \t\n") + 1;
 *
 *			if (lnlen + span > MAXLEN) {
 *				span = MAXLEN - lnlen;
 *				xstrAddSubsT(x, p, span, "\n", 1, NULL);
 *			}
 *			else
 *				xstrAddSubT(x, p, span);
 *
 *			if (x->truncated) {
 *				fputs(x->str, stdout);
 *				xstrClear(x);
 *				continue; // p unchanged
 *			}
 *
 *			q = x->str + x->len - 1;
 *			if (lnlen + MARGIN > MAXLEN)
 *				*q = '\n';
 *
 *			lnlen = *q == '\n' ? 0 : lnlen + span;
 *			p += span;
 *		}
 *
 *		if (x->len)
 *			fputs(x->str, stdout);
 *
 *		return 0;
 *	}
 *
 * License: APACHE-2
 * Author: Dan Good <dan@dancancode.com>
 */
int main(int argc, char *argv[])
{
	/* Expect exactly one argument */
	if (argc != 2)
		return 1;

	if (strcmp(argv[1], "depends") == 0)
		return 0;
	if (strcmp(argv[1], "testdepends") == 0) {
		printf("ccan/failtest\n");
		return 0;
	}

	return 1;
}