Subversion Repositories planix.SVN

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

static int
runeFmtStrFlush(Fmt *f)
{
        Rune *s;
        int n;

        if(f->start == nil)
                return 0;
        n = (int)(uintptr)f->farg;
        n *= 2;
        s = f->start;
        f->start = realloc(s, sizeof(Rune)*n);
        if(f->start == nil){
                f->farg = nil;
                f->to = nil;
                f->stop = nil;
                free(s);
                return 0;
        }
        f->farg = (void*)n;
        f->to = (Rune*)f->start + ((Rune*)f->to - s);
        f->stop = (Rune*)f->start + n - 1;
        return 1;
}

int
runefmtstrinit(Fmt *f)
{
        int n;

        memset(f, 0, sizeof *f);
        f->runes = 1;
        n = 32;
        f->start = malloc(sizeof(Rune)*n);
        if(f->start == nil)
                return -1;
        setmalloctag(f->start, getcallerpc(&f));
        f->to = f->start;
        f->stop = (Rune*)f->start + n - 1;
        f->flush = runeFmtStrFlush;
        f->farg = (void*)n;
        f->nfmt = 0;
        return 0;
}

/*
 * print into an allocated string buffer
 */
Rune*
runevsmprint(char *fmt, va_list args)
{
        Fmt f;
        int n;

        if(runefmtstrinit(&f) < 0)
                return nil;
        f.args = args;
        n = dofmt(&f, fmt);
        if(f.start == nil)              /* realloc failed? */
                return nil;
        if(n < 0){
                free(f.start);
                return nil;
        }
        setmalloctag(f.start, getcallerpc(&fmt));
        *(Rune*)f.to = '\0';
        return f.start;
}