/*
 * Simple example to show the basic regexp(3) functions
 * in action (regexec() and regcomp()).
 *
 * Juan RP <xtraeme@NetBSD.org> <-> 2005/09/22.
 */


#include <stdio.h>
#include <stdlib.h>
#include <regex.h>

struct compat_osver {
	const char	*hosver_reg;	/* host os version */ 
        const char	*bosver_reg;	/* builder os version */
} compat_osver[] = {
	{ "^3.99.[8-9]*", "3.99.[1-8]" },	/* COMPAT_30 for HEAD */
	{ "^3.99.[8-9]*", "3.[0-8]*", },	/* COMPAT_30 for 3.x */
	{ "^3.99.[8-9]*", "[2-3].[0-8]", },	/* COMPAT_[23]0 for HEAD */
	{ "^3.99.[8-9]*", "[1-2].*", },		/* COMPAT_[12]* for HEAD */
	{ "^3.[0-8]*", "[1-2].*", },		/* COMPAT_[12]* for 3.x */
	{ "^2.*", "^1.*$", },			/* COMPAT_1[1-6] for 2.x */
	{ NULL, NULL }
};

void usage(void);
void check_osver(const char *, const char *);

void
usage(void)
{
	printf("pkgosver [host os version] [builder os version]\n");
	exit(EXIT_FAILURE);
}

void
check_osver(const char *h_os_ver, const char *b_os_ver)
{
	struct compat_osver *c_osver;
	regex_t host_reg, builder_reg;
	int i, found;

	i = found = 0;
	for (c_osver = compat_osver; c_osver->hosver_reg != NULL; c_osver++) {
		i++;
		printf("%d: HOST OS VERSION: %s ", i, c_osver->hosver_reg);
		printf("%d: BUILDER OS VERSION: %s\n", i, c_osver->bosver_reg);
		regcomp(&host_reg, c_osver->hosver_reg, REG_NOSUB);
		/* check host os version string */
		if (regexec(&host_reg, h_os_ver, 10, NULL, 0) == 0) {
			regfree(&host_reg);
			regcomp(&builder_reg, c_osver->bosver_reg, REG_NOSUB);
			/* check builder os version string */
			if (regexec(&builder_reg, b_os_ver, 10, NULL, 0) == 0) {
				regfree(&builder_reg);
				/* found! */
				printf("regexp %d matched!\n", i);
				found = 1;
				break;
			}
			regfree(&builder_reg);
		}
		regfree(&host_reg);
	}
	if (found != 1)	
		printf("not mached!\n");
}

int
main(int argc, char **argv)
{
	if (argc != 3)
		usage();

	check_osver(argv[1], argv[2]);
	
	exit(EXIT_SUCCESS);
}