1 /* This header file provides the reentrancy. */ 2 3 /* WARNING: All identifiers here must begin with an underscore. This file is 4 included by stdio.h and others and we therefore must only use identifiers 5 in the namespace allotted to us. */ 6 7 #ifndef _SYS_REENT_H_ 8 #ifdef __cplusplus 9 extern "C" { 10 #endif 11 #define _SYS_REENT_H_ 12 13 #include <_ansi.h> 14 #include <time.h> 15 16 #ifndef __Long 17 #if __LONG_MAX__ == 2147483647L 18 #define __Long long 19 typedef unsigned __Long __ULong; 20 #elif __INT_MAX__ == 2147483647 21 #define __Long int 22 typedef unsigned __Long __ULong; 23 #endif 24 #endif 25 26 #ifndef __Long 27 #define __Long __int32_t 28 typedef __uint32_t __ULong; 29 #endif 30 31 struct _glue 32 { 33 struct _glue *_next; 34 int _niobs; 35 struct __sFILE *_iobs; 36 }; 37 38 struct _Bigint 39 { 40 struct _Bigint *_next; 41 int _k, _maxwds, _sign, _wds; 42 __ULong _x[1]; 43 }; 44 45 /* 46 * atexit() support 47 */ 48 49 #define _ATEXIT_SIZE 32 /* must be at least 32 to guarantee ANSI conformance */ 50 51 struct _atexit { 52 struct _atexit *_next; /* next in list */ 53 int _ind; /* next index in this table */ 54 void (*_fns[_ATEXIT_SIZE])(void); /* the table itself */ 55 }; 56 57 /* 58 * Stdio buffers. 59 * 60 * This and __sFILE are defined here because we need them for struct _reent, 61 * but we don't want stdio.h included when stdlib.h is. 62 */ 63 64 struct __sbuf { 65 unsigned char *_base; 66 int _size; 67 }; 68 69 /* 70 * We need fpos_t for the following, but it doesn't have a leading "_", 71 * so we use _fpos_t instead. 72 */ 73 74 typedef long _fpos_t; /* XXX must match off_t in <sys/types.h> */ 75 /* (and must be `long' for now) */ 76 77 /* 78 * Stdio state variables. 79 * 80 * The following always hold: 81 * 82 * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR), 83 * _lbfsize is -_bf._size, else _lbfsize is 0 84 * if _flags&__SRD, _w is 0 85 * if _flags&__SWR, _r is 0 86 * 87 * This ensures that the getc and putc macros (or inline functions) never 88 * try to write or read from a file that is in `read' or `write' mode. 89 * (Moreover, they can, and do, automatically switch from read mode to 90 * write mode, and back, on "r+" and "w+" files.) 91 * 92 * _lbfsize is used only to make the inline line-buffered output stream 93 * code as compact as possible. 94 * 95 * _ub, _up, and _ur are used when ungetc() pushes back more characters 96 * than fit in the current _bf, or when ungetc() pushes back a character 97 * that does not match the previous one in _bf. When this happens, 98 * _ub._base becomes non-nil (i.e., a stream has ungetc() data iff 99 * _ub._base!=NULL) and _up and _ur save the current values of _p and _r. 100 */ 101 102 struct __sFILE { 103 unsigned char *_p; /* current position in (some) buffer */ 104 int _r; /* read space left for getc() */ 105 int _w; /* write space left for putc() */ 106 short _flags; /* flags, below; this FILE is free if 0 */ 107 short _file; /* fileno, if Unix descriptor, else -1 */ 108 struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */ 109 int _lbfsize; /* 0 or -_bf._size, for inline putc */ 110 111 /* operations */ 112 _PTR _cookie; /* cookie passed to io functions */ 113 114 int _EXFUN((*_read),(_PTR _cookie, char *_buf, int _n)); 115 int _EXFUN((*_write),(_PTR _cookie, const char *_buf, int _n)); 116 _fpos_t _EXFUN((*_seek),(_PTR _cookie, _fpos_t _offset, int _whence)); 117 int _EXFUN((*_close),(_PTR _cookie)); 118 119 /* separate buffer for long sequences of ungetc() */ 120 struct __sbuf _ub; /* ungetc buffer */ 121 unsigned char *_up; /* saved _p when _p is doing ungetc data */ 122 int _ur; /* saved _r when _r is counting ungetc data */ 123 124 /* tricks to meet minimum requirements even when malloc() fails */ 125 unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */ 126 unsigned char _nbuf[1]; /* guarantee a getc() buffer */ 127 128 /* separate buffer for fgetline() when line crosses buffer boundary */ 129 struct __sbuf _lb; /* buffer for fgetline() */ 130 131 /* Unix stdio files get aligned to block boundaries on fseek() */ 132 int _blksize; /* stat.st_blksize (may be != _bf._size) */ 133 int _offset; /* current lseek offset */ 134 135 struct _reent *_data; 136 }; 137 138 /* 139 * struct _reent 140 * 141 * This structure contains *all* globals needed by the library. 142 * It's raison d'etre is to facilitate threads by making all library routines 143 * reentrant. IE: All state information is contained here. 144 */ 145 146 struct _reent 147 { 148 /* local copy of errno */ 149 int _errno; 150 151 /* FILE is a big struct and may change over time. To try to achieve binary 152 compatibility with future versions, put stdin,stdout,stderr here. 153 These are pointers into member __sf defined below. */ 154 struct __sFILE *_stdin, *_stdout, *_stderr; 155 156 int _inc; /* used by tmpnam */ 157 char _emergency[25]; 158 159 int _current_category; /* used by setlocale */ 160 _CONST char *_current_locale; 161 162 int __sdidinit; /* 1 means stdio has been init'd */ 163 164 void _EXFUN((*__cleanup),(struct _reent *)); 165 166 /* used by mprec routines */ 167 struct _Bigint *_result; 168 int _result_k; 169 struct _Bigint *_p5s; 170 struct _Bigint **_freelist; 171 172 /* used by some fp conversion routines */ 173 int _cvtlen; /* should be size_t */ 174 char *_cvtbuf; 175 176 union 177 { 178 struct 179 { 180 unsigned int _unused_rand; 181 char * _strtok_last; 182 char _asctime_buf[26]; 183 struct tm _localtime_buf; 184 int _gamma_signgam; 185 __extension__ unsigned long long _rand_next; 186 187 } _reent; 188 /* Two next two fields were once used by malloc. They are no longer 189 used. They are used to preserve the space used before so as to 190 allow addition of new reent fields and keep binary compatibility. */ 191 struct 192 { 193 #define _N_LISTS 30 194 unsigned char * _nextf[_N_LISTS]; 195 unsigned int _nmalloc[_N_LISTS]; 196 } _unused; 197 } _new; 198 199 /* atexit stuff */ 200 struct _atexit *_atexit; /* points to head of LIFO stack */ 201 struct _atexit _atexit0; /* one guaranteed table, required by ANSI */ 202 203 /* signal info */ 204 void (**(_sig_func))(int); 205 206 /* These are here last so that __sFILE can grow without changing the offsets 207 of the above members (on the off chance that future binary compatibility 208 would be broken otherwise). */ 209 struct _glue __sglue; /* root of glue chain */ 210 struct __sFILE __sf[3]; /* first three file descriptors */ 211 }; 212 213 #define _REENT_INIT(var) \ 214 { 0, &var.__sf[0], &var.__sf[1], &var.__sf[2], 0, "", 0, "C", \ 215 0, NULL, NULL, 0, NULL, NULL, 0, NULL, { {0, NULL, "", \ 216 { 0,0,0,0,0,0,0,0}, 0, 1} } } 217 218 /* 219 * All references to struct _reent are via this pointer. 220 * Internally, newlib routines that need to reference it should use _REENT. 221 */ 222 223 #ifndef __ATTRIBUTE_IMPURE_PTR__ 224 #define __ATTRIBUTE_IMPURE_PTR__ 225 #endif 226 227 extern struct _reent *_impure_ptr __ATTRIBUTE_IMPURE_PTR__; 228 229 void _reclaim_reent _PARAMS ((struct _reent *)); 230 231 /* #define _REENT_ONLY define this to get only reentrant routines */ 232 233 #ifndef _REENT_ONLY 234 #define _REENT _impure_ptr 235 #endif 236 237 #ifdef __cplusplus 238 } 239 #endif 240 #endif /* _SYS_REENT_H_ */ |