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	bufblock.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	---
	bufblock.c (1338B)
	---
	1 #include "mk.h"
	2
	3 static Bufblock *freelist;
	4 #define QUANTA 4096
	5
	6 Bufblock *
	7 newbuf(void)
	8 {
	9 Bufblock *p;
	10
	11 if (freelist) {
	12 p = freelist;
	13 freelist = freelist->next;
	14 } else {
	15 p = (Bufblock *) Malloc(sizeof(Bufblock));
	16 p->start = Malloc(QUANTAsizeof(p->start));
	17 p->end = p->start+QUANTA;
	18 }
	19 p->current = p->start;
	20 *p->start = 0;
	21 p->next = 0;
	22 return p;
	23 }
	24
	25 void
	26 freebuf(Bufblock *p)
	27 {
	28 p->next = freelist;
	29 freelist = p;
	30 }
	31
	32 void
	33 growbuf(Bufblock *p)
	34 {
	35 int n;
	36 Bufblock *f;
	37 char *cp;
	38
	39 n = p->end-p->start+QUANTA;
	40 /* search the free list for a big buffer */
	41 for (f = freelist; f; f = f->next) {
	42 if (f->end-f->start >= n) {
	43 memcpy(f->start, p->start, p->end-p->start);
	44 cp = f->start;
	45 f->start = p->start;
	46 p->start = cp;
	47 cp = f->end;
	48 f->end = p->end;
	49 p->end = cp;
	50 f->current = f->start;
	51 break;
	52 }
	53 }
	54 if (!f) { /* not found - grow it */
	55 p->start = Realloc(p->start, n);
	56 p->end = p->start+n;
	57 }
	58 p->current = p->start+n-QUANTA;
	59 }
	60
	61 void
	62 bufcpy(Bufblock buf, char cp, int n)
	63 {
	64
	65 while (n--)
	66 insert(buf, *cp++);
	67 }
	68
	69 void
	70 insert(Bufblock *buf, int c)
	71 {
	72
	73 if (buf->current >= buf->end)
	74 growbuf(buf);
	75 *buf->current++ = c;
	76 }
	77
	78 void
	79 rinsert(Bufblock *buf, Rune r)
	80 {
	81 int n;
	82
	83 n = runelen(r);
	84 if (buf->current+n > buf->end)
	85 growbuf(buf);
	86 runetochar(buf->current, &r);
	87 buf->current += n;
	88 }