241 lines
6.7 KiB
C
241 lines
6.7 KiB
C
/* This header file provides the reentrancy. */
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/* WARNING: All identifiers here must begin with an underscore. This file is
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included by stdio.h and others and we therefore must only use identifiers
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in the namespace allotted to us. */
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#ifndef _SYS_REENT_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define _SYS_REENT_H_
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#include <_ansi.h>
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#include <time.h>
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#ifndef __Long
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#if __LONG_MAX__ == 2147483647L
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#define __Long long
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typedef unsigned __Long __ULong;
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#elif __INT_MAX__ == 2147483647
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#define __Long int
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typedef unsigned __Long __ULong;
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#endif
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#endif
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#ifndef __Long
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#define __Long __int32_t
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typedef __uint32_t __ULong;
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#endif
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struct _glue
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{
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struct _glue *_next;
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int _niobs;
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struct __sFILE *_iobs;
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};
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struct _Bigint
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{
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struct _Bigint *_next;
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int _k, _maxwds, _sign, _wds;
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__ULong _x[1];
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};
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/*
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* atexit() support
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*/
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#define _ATEXIT_SIZE 32 /* must be at least 32 to guarantee ANSI conformance */
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struct _atexit {
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struct _atexit *_next; /* next in list */
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int _ind; /* next index in this table */
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void (*_fns[_ATEXIT_SIZE])(void); /* the table itself */
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};
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/*
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* Stdio buffers.
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*
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* This and __sFILE are defined here because we need them for struct _reent,
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* but we don't want stdio.h included when stdlib.h is.
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*/
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struct __sbuf {
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unsigned char *_base;
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int _size;
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};
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/*
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* We need fpos_t for the following, but it doesn't have a leading "_",
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* so we use _fpos_t instead.
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*/
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typedef long _fpos_t; /* XXX must match off_t in <sys/types.h> */
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/* (and must be `long' for now) */
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/*
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* Stdio state variables.
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*
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* The following always hold:
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*
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* if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
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* _lbfsize is -_bf._size, else _lbfsize is 0
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* if _flags&__SRD, _w is 0
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* if _flags&__SWR, _r is 0
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*
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* This ensures that the getc and putc macros (or inline functions) never
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* try to write or read from a file that is in `read' or `write' mode.
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* (Moreover, they can, and do, automatically switch from read mode to
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* write mode, and back, on "r+" and "w+" files.)
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*
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* _lbfsize is used only to make the inline line-buffered output stream
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* code as compact as possible.
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*
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* _ub, _up, and _ur are used when ungetc() pushes back more characters
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* than fit in the current _bf, or when ungetc() pushes back a character
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* that does not match the previous one in _bf. When this happens,
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* _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
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* _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
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*/
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struct __sFILE {
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unsigned char *_p; /* current position in (some) buffer */
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int _r; /* read space left for getc() */
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int _w; /* write space left for putc() */
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short _flags; /* flags, below; this FILE is free if 0 */
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short _file; /* fileno, if Unix descriptor, else -1 */
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struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
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int _lbfsize; /* 0 or -_bf._size, for inline putc */
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/* operations */
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_PTR _cookie; /* cookie passed to io functions */
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int _EXFUN((*_read),(_PTR _cookie, char *_buf, int _n));
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int _EXFUN((*_write),(_PTR _cookie, const char *_buf, int _n));
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_fpos_t _EXFUN((*_seek),(_PTR _cookie, _fpos_t _offset, int _whence));
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int _EXFUN((*_close),(_PTR _cookie));
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/* separate buffer for long sequences of ungetc() */
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struct __sbuf _ub; /* ungetc buffer */
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unsigned char *_up; /* saved _p when _p is doing ungetc data */
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int _ur; /* saved _r when _r is counting ungetc data */
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/* tricks to meet minimum requirements even when malloc() fails */
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unsigned char _ubuf[3]; /* guarantee an ungetc() buffer */
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unsigned char _nbuf[1]; /* guarantee a getc() buffer */
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/* separate buffer for fgetline() when line crosses buffer boundary */
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struct __sbuf _lb; /* buffer for fgetline() */
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/* Unix stdio files get aligned to block boundaries on fseek() */
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int _blksize; /* stat.st_blksize (may be != _bf._size) */
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int _offset; /* current lseek offset */
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struct _reent *_data;
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};
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/*
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* struct _reent
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*
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* This structure contains *all* globals needed by the library.
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* It's raison d'etre is to facilitate threads by making all library routines
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* reentrant. IE: All state information is contained here.
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*/
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struct _reent
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{
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/* local copy of errno */
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int _errno;
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/* FILE is a big struct and may change over time. To try to achieve binary
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compatibility with future versions, put stdin,stdout,stderr here.
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These are pointers into member __sf defined below. */
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struct __sFILE *_stdin, *_stdout, *_stderr;
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int _inc; /* used by tmpnam */
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char _emergency[25];
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int _current_category; /* used by setlocale */
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_CONST char *_current_locale;
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int __sdidinit; /* 1 means stdio has been init'd */
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void _EXFUN((*__cleanup),(struct _reent *));
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/* used by mprec routines */
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struct _Bigint *_result;
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int _result_k;
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struct _Bigint *_p5s;
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struct _Bigint **_freelist;
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/* used by some fp conversion routines */
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int _cvtlen; /* should be size_t */
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char *_cvtbuf;
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union
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{
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struct
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{
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unsigned int _unused_rand;
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char * _strtok_last;
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char _asctime_buf[26];
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struct tm _localtime_buf;
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int _gamma_signgam;
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__extension__ unsigned long long _rand_next;
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} _reent;
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/* Two next two fields were once used by malloc. They are no longer
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used. They are used to preserve the space used before so as to
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allow addition of new reent fields and keep binary compatibility. */
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struct
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{
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#define _N_LISTS 30
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unsigned char * _nextf[_N_LISTS];
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unsigned int _nmalloc[_N_LISTS];
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} _unused;
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} _new;
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/* atexit stuff */
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struct _atexit *_atexit; /* points to head of LIFO stack */
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struct _atexit _atexit0; /* one guaranteed table, required by ANSI */
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/* signal info */
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void (**(_sig_func))(int);
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/* These are here last so that __sFILE can grow without changing the offsets
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of the above members (on the off chance that future binary compatibility
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would be broken otherwise). */
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struct _glue __sglue; /* root of glue chain */
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struct __sFILE __sf[3]; /* first three file descriptors */
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};
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#define _REENT_INIT(var) \
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{ 0, &var.__sf[0], &var.__sf[1], &var.__sf[2], 0, "", 0, "C", \
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0, NULL, NULL, 0, NULL, NULL, 0, NULL, { {0, NULL, "", \
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{ 0,0,0,0,0,0,0,0}, 0, 1} } }
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/*
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* All references to struct _reent are via this pointer.
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* Internally, newlib routines that need to reference it should use _REENT.
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*/
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#ifndef __ATTRIBUTE_IMPURE_PTR__
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#define __ATTRIBUTE_IMPURE_PTR__
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#endif
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extern struct _reent *_impure_ptr __ATTRIBUTE_IMPURE_PTR__;
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void _reclaim_reent _PARAMS ((struct _reent *));
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/* #define _REENT_ONLY define this to get only reentrant routines */
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#ifndef _REENT_ONLY
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#define _REENT _impure_ptr
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_REENT_H_ */
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