#define MAX_PATH 1024

/* dirwalk:  apply fcn to all files in dir */
void dirwalk(char *dir, void (*fcn)(char *))
{
	char name[MAX_PATH];
	Dirent *dp;
	DIR *dfd;

	if ((dfd = opendir(dir)) == NULL) {
		fprintf(stderr, "dirwalk: can't open %s\n", dir);
		return;
	}
	while ((dp = readdir(dfd)) != NULL) {
		if (strcmp(dp->name, ".") == 0
		 || strcmp(dp->name, "..") == 0)
			continue;	/* skip self and parent */
		if (strlen(dir)+strlen(dp->name)+2 > sizeof(name))
			fprintf(stderr, "dirwalk: name %s/%s too long\n",
				dir, dp->name);
		else {
			sprintf(name, "%s/%s", dir, dp->name);
			(*fcn)(name);
		}
	}
	closedir(dfd);
}