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	brdstr.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	brdstr.c (2086B)
	---
	1 #include "lib9.h"
	2 #include <bio.h>
	3
	4 static char*
	5 badd(char p, int np, char *data, int ndata, int delim, int nulldelim)
	6 {
	7 int n;
	8
	9 n = *np;
	10 p = realloc(p, n+ndata+1);
	11 if(p){
	12 memmove(p+n, data, ndata);
	13 n += ndata;
	14 if(n>0 && nulldelim && p[n-1]==delim)
	15 p[--n] = '\0';
	16 else
	17 p[n] = '\0';
	18 *np = n;
	19 }
	20 return p;
	21 }
	22
	23 char*
	24 Brdstr(Biobuf *bp, int delim, int nulldelim)
	25 {
	26 char ip, ep, *p;
	27 int i, j;
	28
	29 i = -bp->icount;
	30 bp->rdline = 0;
	31 if(i == 0) {
	32 /*
	33 * eof or other error
	34 */
	35 if(bp->state != Bractive) {
	36 if(bp->state == Bracteof)
	37 bp->state = Bractive;
	38 bp->gbuf = bp->ebuf;
	39 return nil;
	40 }
	41 }
	42
	43 /*
	44 * first try in remainder of buffer (gbuf doesn't change)
	45 */
	46 ip = (char*)bp->ebuf - i;
	47 ep = memchr(ip, delim, i);
	48 if(ep) {
	49 j = (ep - ip) + 1;
	50 bp->icount += j;
	51 return badd(nil, &bp->rdline, ip, j, delim, nulldelim);
	52 }
	53
	54 /*
	55 * copy data to beginning of buffer
	56 */
	57 if(i < bp->bsize)
	58 memmove(bp->bbuf, ip, i);
	59 bp->gbuf = bp->bbuf;
	60
	61 /*
	62 * append to buffer looking for the delim
	63 */
	64 p = nil;
	65 for(;;){
	66 ip = (char*)bp->bbuf + i;
	67 while(i < bp->bsize) {
	68 j = read(bp->fid, ip, bp->bsize-i);
	69 if(j <= 0 && i == 0)
	70 return p;
	71 if(j <= 0 && i > 0){
	72 /*
	73 * end of file but no delim. pretend we …
	74 * by making the delim \0 and smashing i…
	75 */
	76 j = 1;
	77 ep = ip;
	78 delim = '\0';
	79 nulldelim = 1;
	80 ep = delim; / there will be roo…
	81 }else{
	82 bp->offset += j;
	83 ep = memchr(ip, delim, j);
	84 }
	85 i += j;
	86 if(ep) {
	87 /*
	88 * found in new piece
	89 * copy back up and reset everything
	90 */
	91 ip = (char*)bp->ebuf - i;
	92 if(i < bp->bsize){
	93 memmove(ip, bp->bbuf, i);
	94 bp->gbuf = (unsigned char*)ip;
	95 }
	96 j = (ep - (char*)bp->bbuf) + 1;
	97 bp->icount = j - i;
	98 return badd(p, &bp->rdline, ip, j, delim…
	99 }
	100 ip += j;
	101 }
	102
	103 /*
	104 * full buffer without finding; add to user string and c…
	105 */
	106 p = badd(p, &bp->rdline, (char*)bp->bbuf, bp->bsize, 0, …
	107 i = 0;
	108 bp->icount = 0;
	109 bp->gbuf = bp->ebuf;
	110 }
	111 }