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 #ifndef _SFIO_T_H 23 #define _SFIO_T_H 1 24 25 /* This header file is for library writers who need to know certain 26 ** internal info concerning the full Sfio_t structure. Including this 27 ** file means that you agree to track closely with sfio development 28 ** in case its internal architecture is changed. 29 ** 30 ** Written by Kiem-Phong Vo 31 */ 32 33 /* the parts of Sfio_t private to sfio functions */ 34 #define _SFIO_PRIVATE \ 35 Sfoff_t extent; /* current file size */ \ 36 Sfoff_t here; /* current physical location */ \ 37 unsigned char getr; /* the last sfgetr separator */ \ 38 unsigned char tiny[1];/* for unbuffered read stream */ \ 39 unsigned short bits; /* private flags */ \ 40 unsigned int mode; /* current io mode */ \ 41 struct _sfdisc_s* disc; /* discipline */ \ 42 struct _sfpool_s* pool; /* the pool containing this */ \ 43 struct _sfrsrv_s* rsrv; /* reserved buffer */ \ 44 struct _sfproc_s* proc; /* coprocess id, etc. */ \ 45 Void_t* mutex; /* mutex for thread-safety */ \ 46 Void_t* stdio; /* stdio FILE if any */ \ 47 Sfoff_t lpos; /* last seek position */ \ 48 size_t iosz; /* preferred size for I/O */ \ 49 size_t blksz; /* preferred block size */ \ 50 Void_t* fill[1];/* modest expansion */ 51 52 #include "sfio.h" 53 54 /* mode bit to indicate that the structure hasn't been initialized */ 55 #define SF_INIT 0000004 56 #define SF_DCDOWN 00010000 57 58 /* short-hand for common stream types */ 59 #define SF_RDWR (SF_READ|SF_WRITE) 60 #define SF_RDSTR (SF_READ|SF_STRING) 61 #define SF_WRSTR (SF_WRITE|SF_STRING) 62 #define SF_RDWRSTR (SF_RDWR|SF_STRING) 63 64 /* for static initialization of an Sfio_t structure */ 65 #define SFNEW(data,size,file,type,disc,mutex) \ 66 { (unsigned char*)(data), /* next */ \ 67 (unsigned char*)(data), /* endw */ \ 68 (unsigned char*)(data), /* endr */ \ 69 (unsigned char*)(data), /* endb */ \ 70 (Sfio_t*)0, /* push */ \ 71 (unsigned short)((type)&SF_FLAGS), /* flags */ \ 72 (short)(file), /* file */ \ 73 (unsigned char*)(data), /* data */ \ 74 (ssize_t)(size), /* size */ \ 75 (ssize_t)(-1), /* val */ \ 76 (Sfoff_t)0, /* extent */ \ 77 (Sfoff_t)0, /* here */ \ 78 0, /* getr */ \ 79 {0}, /* tiny */ \ 80 0, /* bits */ \ 81 (unsigned int)(((type)&(SF_RDWR))|SF_INIT), /* mode */ \ 82 (struct _sfdisc_s*)(disc), /* disc */ \ 83 (struct _sfpool_s*)0, /* pool */ \ 84 (struct _sfrsrv_s*)0, /* rsrv */ \ 85 (struct _sfproc_s*)0, /* proc */ \ 86 (mutex), /* mutex */ \ 87 (Void_t*)0, /* stdio */ \ 88 (Sfoff_t)0, /* lpos */ \ 89 (size_t)0 /* iosz */ \ 90 } 91 92 /* function to clear an Sfio_t structure */ 93 #define SFCLEAR(f,mtx) \ 94 ( (f)->next = (unsigned char*)0, /* next */ \ 95 (f)->endw = (unsigned char*)0, /* endw */ \ 96 (f)->endr = (unsigned char*)0, /* endr */ \ 97 (f)->endb = (unsigned char*)0, /* endb */ \ 98 (f)->push = (Sfio_t*)0, /* push */ \ 99 (f)->flags = (unsigned short)0, /* flags */ \ 100 (f)->file = -1, /* file */ \ 101 (f)->data = (unsigned char*)0, /* data */ \ 102 (f)->size = (ssize_t)(-1), /* size */ \ 103 (f)->val = (ssize_t)(-1), /* val */ \ 104 (f)->extent = (Sfoff_t)(-1), /* extent */ \ 105 (f)->here = (Sfoff_t)0, /* here */ \ 106 (f)->getr = 0, /* getr */ \ 107 (f)->tiny[0] = 0, /* tiny */ \ 108 (f)->bits = 0, /* bits */ \ 109 (f)->mode = 0, /* mode */ \ 110 (f)->disc = (struct _sfdisc_s*)0, /* disc */ \ 111 (f)->pool = (struct _sfpool_s*)0, /* pool */ \ 112 (f)->rsrv = (struct _sfrsrv_s*)0, /* rsrv */ \ 113 (f)->proc = (struct _sfproc_s*)0, /* proc */ \ 114 (f)->mutex = (mtx), /* mutex */ \ 115 (f)->stdio = (Void_t*)0, /* stdio */ \ 116 (f)->lpos = (Sfoff_t)0, /* lpos */ \ 117 (f)->iosz = (size_t)0 /* iosz */ \ 118 ) 119 120 /* expose next stream inside discipline function; state saved in int f */ 121 #define SFDCNEXT(sp,f) (((f)=(sp)->bits&SF_DCDOWN),(sp)->bits|=SF_DCDOWN) 122 123 /* restore SFDCNEXT() state from int f */ 124 #define SFDCPREV(sp,f) ((f)?(0):((sp)->bits&=~SF_DCDOWN)) 125 126 #endif /* _SFIO_T_H */ 127