tbrdline.c - plan9port - [fork] Plan 9 from user space
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tbrdline.c (1519B)
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1 #include "lib9.h"
2 #include <bio.h>
3
4 void*
5 Brdline(Biobuf *bp, int delim)
6 {
7 char *ip, *ep;
8 int i, j;
9
10 i = -bp->icount;
11 if(i == 0) {
12 /*
13 * eof or other error
14 */
15 if(bp->state != Bractive) {
16 if(bp->state == Bracteof)
17 bp->state = Bractive;
18 bp->rdline = 0;
19 bp->gbuf = bp->ebuf;
20 return 0;
21 }
22 }
23
24 /*
25 * first try in remainder of buffer (gbuf doesn't change)
26 */
27 ip = (char*)bp->ebuf - i;
28 ep = memchr(ip, delim, i);
29 if(ep) {
30 j = (ep - ip) + 1;
31 bp->rdline = j;
32 bp->icount += j;
33 return ip;
34 }
35
36 /*
37 * copy data to beginning of buffer
38 */
39 if(i < bp->bsize)
40 memmove(bp->bbuf, ip, i);
41 bp->gbuf = bp->bbuf;
42
43 /*
44 * append to buffer looking for the delim
45 */
46 ip = (char*)bp->bbuf + i;
47 while(i < bp->bsize) {
48 j = read(bp->fid, ip, bp->bsize-i);
49 if(j <= 0) {
50 /*
51 * end of file with no delim
52 */
53 memmove(bp->ebuf-i, bp->bbuf, i);
54 bp->rdline = i;
55 bp->icount = -i;
56 bp->gbuf = bp->ebuf-i;
57 return 0;
58 }
59 bp->offset += j;
60 i += j;
61 ep = memchr(ip, delim, j);
62 if(ep) {
63 /*
64 * found in new piece
65 * copy back up and reset everything
66 */
67 ip = (char*)bp->ebuf - i;
68 if(i < bp->bsize){
69 memmove(ip, bp->bbuf, i);
70 bp->gbuf = (unsigned char*)ip;
71 }
72 j = (ep - (char*)bp->bbuf) + 1;
73 bp->rdline = j;
74 bp->icount = j - i;
75 return ip;
76 }
77 ip += j;
78 }
79
80 /*
81 * full buffer without finding
82 */
83 bp->rdline = bp->bsize;
84 bp->icount = -bp->bsize;
85 bp->gbuf = bp->bbuf;
86 return 0;
87 }
88
89 int
90 Blinelen(Biobuf *bp)
91 {
92
93 return bp->rdline;
94 }