brdline.c (1567B)
1 #include "lib9.h" 2 3 #include <bio.h> 4 5 void* Brdline(Biobuf* bp, int delim) { 6 char *ip, *ep; 7 int i, j; 8 9 i = -bp->icount; 10 if (i == 0) { 11 /* 12 * eof or other error 13 */ 14 if (bp->state != Bractive) { 15 if (bp->state == Bracteof) 16 bp->state = Bractive; 17 bp->rdline = 0; 18 bp->gbuf = bp->ebuf; 19 return 0; 20 } 21 } 22 23 /* 24 * first try in remainder of buffer (gbuf doesn't change) 25 */ 26 ip = (char*) bp->ebuf - i; 27 ep = memchr(ip, delim, i); 28 if (ep) { 29 j = (ep - ip) + 1; 30 bp->rdline = j; 31 bp->icount += j; 32 return ip; 33 } 34 35 /* 36 * copy data to beginning of buffer 37 */ 38 if (i < bp->bsize) 39 memmove(bp->bbuf, ip, i); 40 bp->gbuf = bp->bbuf; 41 42 /* 43 * append to buffer looking for the delim 44 */ 45 ip = (char*) bp->bbuf + i; 46 while (i < bp->bsize) { 47 j = read(bp->fid, ip, bp->bsize - i); 48 if (j <= 0) { 49 /* 50 * end of file with no delim 51 */ 52 memmove(bp->ebuf - i, bp->bbuf, i); 53 bp->rdline = i; 54 bp->icount = -i; 55 bp->gbuf = bp->ebuf - i; 56 return 0; 57 } 58 bp->offset += j; 59 i += j; 60 ep = memchr(ip, delim, j); 61 if (ep) { 62 /* 63 * found in new piece 64 * copy back up and reset everything 65 */ 66 ip = (char*) bp->ebuf - i; 67 if (i < bp->bsize) { 68 memmove(ip, bp->bbuf, i); 69 bp->gbuf = (unsigned char*) ip; 70 } 71 j = (ep - (char*) bp->bbuf) + 1; 72 bp->rdline = j; 73 bp->icount = j - i; 74 return ip; 75 } 76 ip += j; 77 } 78 79 /* 80 * full buffer without finding 81 */ 82 bp->rdline = bp->bsize; 83 bp->icount = -bp->bsize; 84 bp->gbuf = bp->bbuf; 85 return 0; 86 } 87 88 int Blinelen(Biobuf* bp) { 89 90 return bp->rdline; 91 }