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