48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#include <draw.h>
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#include <thread.h>
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#include <mouse.h>
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#include <frame.h>
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#define CHUNK 16
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#define ROUNDUP(n) ((n+CHUNK)&~(CHUNK-1))
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uint8_t *
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_frallocstr(Frame *f, unsigned n)
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{
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uint8_t *p;
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p = malloc(ROUNDUP(n));
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if(p == 0)
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drawerror(f->display, "out of memory");
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return p;
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}
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void
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_frinsure(Frame *f, int bn, unsigned n)
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{
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Frbox *b;
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uint8_t *p;
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b = &f->box[bn];
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if(b->nrune < 0)
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drawerror(f->display, "_frinsure");
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if(ROUNDUP(b->nrune) > n) /* > guarantees room for terminal NUL */
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return;
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p = _frallocstr(f, n);
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b = &f->box[bn];
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memmove(p, b->ptr, NBYTE(b)+1);
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free(b->ptr);
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b->ptr = p;
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}
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