Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include "String.h"

#define STRLEN 128

extern void
s_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;
}