#include <u.h>#include <libc.h>#include "String.h" #define STRLEN 128 extern voids_free(String *sp){	if (sp == nil)		return;	lock(sp);	if(--(sp->ref) != 0){		unlock(sp);		return;	}	unlock(sp); 	if(sp->fixed == 0 && sp->base != nil)		free(sp->base);	free(sp);} /* get another reference to a string */extern String *s_incref(String *sp){	lock(sp);	sp->ref++;	unlock(sp); 	return sp;} /* allocate a String head */extern String *_s_alloc(void){	String *s; 	s = mallocz(sizeof *s, 1);	if(s == nil)		return s;	s->ref = 1;	s->fixed = 0;	return s;} /* create a new `short' String */extern String *s_newalloc(int len){	String *sp; 	sp = _s_alloc();	if(sp == nil)		sysfatal("s_newalloc: %r");	setmalloctag(sp, getcallerpc(&len));	if(len < STRLEN)		len = STRLEN;	sp->base = sp->ptr = malloc(len);	if (sp->base == nil)		sysfatal("s_newalloc: %r");	setmalloctag(sp->base, getcallerpc(&len)); 	sp->end = sp->base + len;	s_terminate(sp);	return sp;} /* create a new `short' String */extern String *s_new(void){	String *sp; 	sp = _s_alloc();	if(sp == nil)		sysfatal("s_new: %r");	sp->base = sp->ptr = malloc(STRLEN);	if (sp->base == nil)		sysfatal("s_new: %r");	sp->end = sp->base + STRLEN;	s_terminate(sp);	return sp;}