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