1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2012 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Eclipse Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.eclipse.org/org/documents/epl-v10.html * 11 * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 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 unused_1;/* unused #1 */ \ 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 int getr; /* the last sfgetr separator */ \ 51 _SFIO_PRIVATE_PAD 52 53 #if _ast_sizeof_pointer == 8 54 #define _SFIO_PRIVATE_PAD int pad; 55 #else 56 #define _SFIO_PRIVATE_PAD 57 #endif 58 59 #include "sfio.h" 60 61 /* mode bit to indicate that the structure hasn't been initialized */ 62 #define SF_INIT 0000004 63 #define SF_DCDOWN 00010000 64 65 /* short-hand for common stream types */ 66 #define SF_RDWR (SF_READ|SF_WRITE) 67 #define SF_RDSTR (SF_READ|SF_STRING) 68 #define SF_WRSTR (SF_WRITE|SF_STRING) 69 #define SF_RDWRSTR (SF_RDWR|SF_STRING) 70 71 /* for static initialization of an Sfio_t structure */ 72 #define SFNEW(data,size,file,type,disc,mutex) \ 73 { (unsigned char*)(data), /* next */ \ 74 (unsigned char*)(data), /* endw */ \ 75 (unsigned char*)(data), /* endr */ \ 76 (unsigned char*)(data), /* endb */ \ 77 (Sfio_t*)0, /* push */ \ 78 (unsigned short)((type)&SF_FLAGS), /* flags */ \ 79 (short)(file), /* file */ \ 80 (unsigned char*)(data), /* data */ \ 81 (ssize_t)(size), /* size */ \ 82 (ssize_t)(-1), /* val */ \ 83 (Sfoff_t)0, /* extent */ \ 84 (Sfoff_t)0, /* here */ \ 85 0, /* getr */ \ 86 {0}, /* tiny */ \ 87 0, /* bits */ \ 88 (unsigned int)(((type)&(SF_RDWR))|SF_INIT), /* mode */ \ 89 (struct _sfdisc_s*)(disc), /* disc */ \ 90 (struct _sfpool_s*)0, /* pool */ \ 91 (struct _sfrsrv_s*)0, /* rsrv */ \ 92 (struct _sfproc_s*)0, /* proc */ \ 93 (mutex), /* mutex */ \ 94 (Void_t*)0, /* stdio */ \ 95 (Sfoff_t)0, /* lpos */ \ 96 (size_t)0 /* iosz */ \ 97 } 98 99 /* function to clear an Sfio_t structure */ 100 #define SFCLEAR(f,mtx) \ 101 ( (f)->next = (unsigned char*)0, /* next */ \ 102 (f)->endw = (unsigned char*)0, /* endw */ \ 103 (f)->endr = (unsigned char*)0, /* endr */ \ 104 (f)->endb = (unsigned char*)0, /* endb */ \ 105 (f)->push = (Sfio_t*)0, /* push */ \ 106 (f)->flags = (unsigned short)0, /* flags */ \ 107 (f)->file = -1, /* file */ \ 108 (f)->data = (unsigned char*)0, /* data */ \ 109 (f)->size = (ssize_t)(-1), /* size */ \ 110 (f)->val = (ssize_t)(-1), /* val */ \ 111 (f)->extent = (Sfoff_t)(-1), /* extent */ \ 112 (f)->here = (Sfoff_t)0, /* here */ \ 113 (f)->getr = 0, /* getr */ \ 114 (f)->tiny[0] = 0, /* tiny */ \ 115 (f)->bits = 0, /* bits */ \ 116 (f)->mode = 0, /* mode */ \ 117 (f)->disc = (struct _sfdisc_s*)0, /* disc */ \ 118 (f)->pool = (struct _sfpool_s*)0, /* pool */ \ 119 (f)->rsrv = (struct _sfrsrv_s*)0, /* rsrv */ \ 120 (f)->proc = (struct _sfproc_s*)0, /* proc */ \ 121 (f)->mutex = (mtx), /* mutex */ \ 122 (f)->stdio = (Void_t*)0, /* stdio */ \ 123 (f)->lpos = (Sfoff_t)0, /* lpos */ \ 124 (f)->iosz = (size_t)0 /* iosz */ \ 125 ) 126 127 /* expose next stream inside discipline function; state saved in int f */ 128 #define SFDCNEXT(sp,f) (((f)=(sp)->bits&SF_DCDOWN),(sp)->bits|=SF_DCDOWN) 129 130 /* restore SFDCNEXT() state from int f */ 131 #define SFDCPREV(sp,f) ((f)?(0):((sp)->bits&=~SF_DCDOWN)) 132 133 #endif /* _SFIO_T_H */ 134