#include <u.h>#include <libc.h>#include <bio.h>#include "xml.h" /* * search for element, starting at ep. * if attr!=nil the elem must have an attribute attr * if value!=nil then the elem must have attr=value */ Elem *xmllook(Elem *ep, char *path, char *attr, char *value){	char *p;	Elem *t;	Attr *ap; 	if (path == nil)		return nil;	if (*path == '/')		path++;	if ((p = strchr(path, '/')) == nil)		if((p = strchr(path, 0)) == nil)			return nil;			// shut up lint ! 	for(; ep; ep = ep->next)		if (strncmp(ep->name, path, p-path) == 0){			if (*p == '/'){				if (ep->child)					if ((t = xmllook(ep->child, p, attr, value)) != nil)						return t;				continue;			}			if (attr == nil)				return ep;			for (ap = ep->attrs; ap; ap = ap->next)				if (strcmp(ap->name, attr) == 0){					if (value == nil)						return ep;					if (strcmp(ap->value, value) == 0)						return ep;				}			if (ep->child)				if ((t = xmllook(ep->child, p, attr, value)) != nil)					return t;		}	return nil;}