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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libc/] [stdio/] [findfp.c] - Rev 387
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/* * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ /* No user fns here. Pesch 15apr92. */ #include <_ansi.h> #include <reent.h> #include <stdio.h> #include <stdlib.h> #include <errno.h> #include <string.h> #include <fcntl.h> #include <sys/lock.h> #include "local.h" #ifdef _REENT_SMALL const struct __sFILE_fake __sf_fake_stdin = {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL}; const struct __sFILE_fake __sf_fake_stdout = {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL}; const struct __sFILE_fake __sf_fake_stderr = {_NULL, 0, 0, 0, 0, {_NULL, 0}, 0, _NULL}; #endif static _VOID _DEFUN(std, (ptr, flags, file, data), FILE *ptr _AND int flags _AND int file _AND struct _reent *data) { ptr->_p = 0; ptr->_r = 0; ptr->_w = 0; ptr->_flags = flags; ptr->_flags2 = 0; ptr->_file = file; ptr->_bf._base = 0; ptr->_bf._size = 0; ptr->_lbfsize = 0; memset (&ptr->_mbstate, 0, sizeof (_mbstate_t)); ptr->_cookie = ptr; ptr->_read = __sread; #ifndef __LARGE64_FILES ptr->_write = __swrite; #else /* __LARGE64_FILES */ ptr->_write = __swrite64; ptr->_seek64 = __sseek64; ptr->_flags |= __SL64; #endif /* __LARGE64_FILES */ ptr->_seek = __sseek; ptr->_close = __sclose; #if !defined(__SINGLE_THREAD__) && !defined(_REENT_SMALL) __lock_init_recursive (ptr->_lock); /* * #else * lock is already initialized in __sfp */ #endif #ifdef __SCLE if (__stextmode (ptr->_file)) ptr->_flags |= __SCLE; #endif } struct _glue * _DEFUN(__sfmoreglue, (d, n), struct _reent *d _AND register int n) { struct _glue *g; FILE *p; g = (struct _glue *) _malloc_r (d, sizeof (*g) + n * sizeof (FILE)); if (g == NULL) return NULL; p = (FILE *) (g + 1); g->_next = NULL; g->_niobs = n; g->_iobs = p; memset (p, 0, n * sizeof (FILE)); return g; } /* * Find a free FILE for fopen et al. */ FILE * _DEFUN(__sfp, (d), struct _reent *d) { FILE *fp; int n; struct _glue *g; __sfp_lock_acquire (); if (!_GLOBAL_REENT->__sdidinit) __sinit (_GLOBAL_REENT); for (g = &_GLOBAL_REENT->__sglue;; g = g->_next) { for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++) if (fp->_flags == 0) goto found; if (g->_next == NULL && (g->_next = __sfmoreglue (d, NDYNAMIC)) == NULL) break; } __sfp_lock_release (); d->_errno = ENOMEM; return NULL; found: fp->_file = -1; /* no file */ fp->_flags = 1; /* reserve this slot; caller sets real flags */ fp->_flags2 = 0; #ifndef __SINGLE_THREAD__ __lock_init_recursive (fp->_lock); #endif __sfp_lock_release (); fp->_p = NULL; /* no current pointer */ fp->_w = 0; /* nothing to read or write */ fp->_r = 0; fp->_bf._base = NULL; /* no buffer */ fp->_bf._size = 0; fp->_lbfsize = 0; /* not line buffered */ memset (&fp->_mbstate, 0, sizeof (_mbstate_t)); /* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */ fp->_ub._base = NULL; /* no ungetc buffer */ fp->_ub._size = 0; fp->_lb._base = NULL; /* no line buffer */ fp->_lb._size = 0; return fp; } /* * exit() calls _cleanup() through *__cleanup, set whenever we * open or buffer a file. This chicanery is done so that programs * that do not use stdio need not link it all in. * * The name `_cleanup' is, alas, fairly well known outside stdio. */ _VOID _DEFUN(_cleanup_r, (ptr), struct _reent *ptr) { _CAST_VOID _fwalk(ptr, fclose); /* _CAST_VOID _fwalk (ptr, fflush); */ /* `cheating' */ } #ifndef _REENT_ONLY _VOID _DEFUN_VOID(_cleanup) { _cleanup_r (_GLOBAL_REENT); } #endif /* * __sinit() is called whenever stdio's internal variables must be set up. */ _VOID _DEFUN(__sinit, (s), struct _reent *s) { __sinit_lock_acquire (); if (s->__sdidinit) { __sinit_lock_release (); return; } /* make sure we clean up on exit */ s->__cleanup = _cleanup_r; /* conservative */ s->__sdidinit = 1; s->__sglue._next = NULL; #ifndef _REENT_SMALL s->__sglue._niobs = 3; s->__sglue._iobs = &s->__sf[0]; #else s->__sglue._niobs = 0; s->__sglue._iobs = NULL; s->_stdin = __sfp(s); s->_stdout = __sfp(s); s->_stderr = __sfp(s); #endif std (s->_stdin, __SRD, 0, s); /* On platforms that have true file system I/O, we can verify whether stdout is an interactive terminal or not, as part of __smakebuf on first use of the stream. For all other platforms, we will default to line buffered mode here. Technically, POSIX requires both stdin and stdout to be line-buffered, but tradition leaves stdin alone on systems without fcntl. */ #ifdef HAVE_FCNTL std (s->_stdout, __SWR, 1, s); #else std (s->_stdout, __SWR | __SLBF, 1, s); #endif /* POSIX requires stderr to be opened for reading and writing, even when the underlying fd 2 is write-only. */ std (s->_stderr, __SRW | __SNBF, 2, s); __sinit_lock_release (); } #ifndef __SINGLE_THREAD__ __LOCK_INIT_RECURSIVE(static, __sfp_lock); __LOCK_INIT_RECURSIVE(static, __sinit_lock); _VOID _DEFUN_VOID(__sfp_lock_acquire) { __lock_acquire_recursive (__sfp_lock); } _VOID _DEFUN_VOID(__sfp_lock_release) { __lock_release_recursive (__sfp_lock); } _VOID _DEFUN_VOID(__sinit_lock_acquire) { __lock_acquire_recursive (__sinit_lock); } _VOID _DEFUN_VOID(__sinit_lock_release) { __lock_release_recursive (__sinit_lock); } /* Walkable file locking routine. */ static int _DEFUN(__fp_lock, (ptr), FILE * ptr) { _flockfile (ptr); return 0; } /* Walkable file unlocking routine. */ static int _DEFUN(__fp_unlock, (ptr), FILE * ptr) { _funlockfile (ptr); return 0; } _VOID _DEFUN_VOID(__fp_lock_all) { __sfp_lock_acquire (); _CAST_VOID _fwalk (_REENT, __fp_lock); } _VOID _DEFUN_VOID(__fp_unlock_all) { _CAST_VOID _fwalk (_REENT, __fp_unlock); __sfp_lock_release (); } #endif
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