1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 24 /* 25 * return the length of the current record at b, size n, according to f 26 * -1 returned on error 27 * 0 returned if more data is required 28 */ 29 30 #include <recfmt.h> 31 #include <ctype.h> 32 33 ssize_t 34 reclen(Recfmt_t f, const void* b, size_t n) 35 { 36 register unsigned char* s = (unsigned char*)b; 37 register unsigned char* e; 38 size_t h; 39 size_t z; 40 41 switch (RECTYPE(f)) 42 { 43 case REC_delimited: 44 if (e = (unsigned char*)memchr(s, REC_D_DELIMITER(f), n)) 45 return e - s + 1; 46 return 0; 47 case REC_fixed: 48 return REC_F_SIZE(f); 49 case REC_variable: 50 h = REC_V_HEADER(f); 51 if (n < h) 52 return 0; 53 z = 0; 54 s += REC_V_OFFSET(f); 55 e = s + REC_V_LENGTH(f); 56 if (REC_V_LITTLE(f)) 57 while (e > s) 58 z = (z<<8)|*--e; 59 else 60 while (s < e) 61 z = (z<<8)|*s++; 62 if (!REC_V_INCLUSIVE(f)) 63 z += h; 64 else if (z < h) 65 z = h; 66 return z; 67 case REC_method: 68 return -1; 69 } 70 return -1; 71 } 72