1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <mouse.h>
5 #include <frame.h>
6
7 #define CHUNK 16
8 #define ROUNDUP(n) ((n+CHUNK)&~(CHUNK-1))
9
10 uchar *
_frallocstr(Frame * f,unsigned n)11 _frallocstr(Frame *f, unsigned n)
12 {
13 uchar *p;
14
15 p = malloc(ROUNDUP(n));
16 if(p == 0)
17 drawerror(f->display, "out of memory");
18 return p;
19 }
20
21 void
_frinsure(Frame * f,int bn,unsigned n)22 _frinsure(Frame *f, int bn, unsigned n)
23 {
24 Frbox *b;
25 uchar *p;
26
27 b = &f->box[bn];
28 if(b->nrune < 0)
29 drawerror(f->display, "_frinsure");
30 if(ROUNDUP(b->nrune) > n) /* > guarantees room for terminal NUL */
31 return;
32 p = _frallocstr(f, n);
33 b = &f->box[bn];
34 memmove(p, b->ptr, NBYTE(b)+1);
35 free(b->ptr);
36 b->ptr = p;
37 }
38