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- #include <u.h>
- #include <libc.h>
- #include <draw.h>
- #include <thread.h>
- #include <mouse.h>
- #include <frame.h>
- #define CHUNK 16
- #define ROUNDUP(n) ((n+CHUNK)&~(CHUNK-1))
- uchar *
- _frallocstr(Frame *f, unsigned n)
- {
- uchar *p;
- p = malloc(ROUNDUP(n));
- if(p == 0)
- drawerror(f->display, "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)
- drawerror(f->display, "_frinsure");
- if(ROUNDUP(b->nrune) > n) /* > guarantees room for terminal NUL */
- return;
- p = _frallocstr(f, n);
- b = &f->box[bn];
- memmove(p, b->ptr, NBYTE(b)+1);
- free(b->ptr);
- b->ptr = p;
- }
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