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frstr.c

/* Copyright (c) 1992 AT&T - All rights reserved. */
#include <u.h>
#include <libc.h>
#include <libg.h>
#include <frame.h>

/*
 * The code here and elsewhere requires that strings not be gcalloc()ed
 */

#define     CHUNK 16
#define     ROUNDUP(n)  ((n+CHUNK)&~(CHUNK-1))

uchar *
_frallocstr(unsigned n)
{
      uchar *p;

      p = malloc(ROUNDUP(n));
      if(p == 0)
            berror("out of memory");
      return p;
}

void
_frinsure(Frame *f, int bn, unsigned n)
{
      Frbox *b;
      uchar *p;

      b = &f->box[bn];
      if(b->nrune < 0)
            berror("_frinsure");
      if(ROUNDUP(b->nrune) > n)     /* > guarantees room for terminal NUL */
            return;
      p = _frallocstr(n);
      b = &f->box[bn];
      memmove(p, b->a.ptr, NBYTE(b)+1);
      free(b->a.ptr);
      b->a.ptr = p;
}

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