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	frstr.c - sam - An updated version of the sam text editor.
	git clone git://vernunftzentrum.de/sam.git
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	---
	frstr.c (771B)
	---
	1 /* Copyright (c) 1998 Lucent Technologies - All rights reserved. */
	2 #include <u.h>
	3 #include <libg.h>
	4 #include <frame.h>
	5
	6 /*
	7 * The code here and elsewhere requires that strings not be gcalloc()ed
	8 */
	9
	10 #define CHUNK 16
	11 #define ROUNDUP(n) ((n+CHUNK)&~(CHUNK-1))
	12
	13 uint8_t *
	14 _frallocstr(unsigned n)
	15 {
	16 uint8_t *p;
	17
	18 p = malloc(ROUNDUP(n));
	19 if(p == 0)
	20 berror("out of memory");
	21 return p;
	22 }
	23
	24 void
	25 _frinsure(Frame *f, int bn, unsigned n)
	26 {
	27 Frbox *b;
	28 uint8_t *p;
	29
	30 b = &f->box[bn];
	31 if(b->nrune < 0)
	32 berror("_frinsure");
	33 if(ROUNDUP(b->nrune) > n) /* > guarantees room for terminal NUL */
	34 return;
	35 p = _frallocstr(n);
	36 b = &f->box[bn];
	37 memmove(p, b->a.ptr, NBYTE(b)+1);
	38 free(b->a.ptr);
	39 b->a.ptr = p;
	40 }