/*
 * FFS pathname manipulation functions
 */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "ffs.h"
#include "limits.h"
#include "ffslimits.h"
#include "exitcodes.h"

validate_ffs_pathname(cand)
	char *cand;
{
	char *cp;
	int depth, c;

	cp = cand;
	if (*cp++ != '/') {
		fprintf(stderr, "error: FFS pathnames must be absolute\n");
		return(-1);
	}
	for (depth = 0; *cp; depth++) {
		if (*cp == '/') {
			fprintf(stderr,
		"error: FFS pathname must not contain duplicate slashes\n");
			return(-1);
		}
		for (c = 0; *cp && *cp != '/'; cp++)
			c++;
		if (c > MAX_FN_COMPONENT) {
			fprintf(stderr,
				"error: FFS pathname component is too long\n");
			return(-1);
		}
		if (!*cp)
			continue;
		cp++;
		if (!*cp) {
			fprintf(stderr,
		"error: FFS pathname must not end with a trailing slash\n");
			return(-1);
		}
	}
	if (depth > MAX_NAME_DEPTH) {
		fprintf(stderr, "error: FFS pathname exceeds depth limit\n");
		return(-1);
	}
	return(depth);
}

char *
pathname_for_ffs_child(parent, childbuf)
	char *parent, *childbuf;
{
	int depth;
	char *cp;

	depth = validate_ffs_pathname(parent);
	if (depth < 0 || depth >= MAX_NAME_DEPTH)
		return(0);
	strcpy(childbuf, parent);
	cp = index(childbuf, '\0');
	if (depth)
		*cp++ = '/';
	return(cp);
}