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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [makebuf.c] - Rev 262
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/* * Copyright (c) 1990, 2007 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 <stdio.h> #include <stdlib.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/unistd.h> #include "local.h" #define _DEFAULT_ASPRINTF_BUFSIZE 64 /* * Allocate a file buffer, or switch to unbuffered I/O. * Per the ANSI C standard, ALL tty devices default to line buffered. * * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek * optimization) right after the _fstat() that finds the buffer size. */ _VOID _DEFUN(__smakebuf_r, (ptr, fp), struct _reent *ptr _AND register FILE *fp) { register size_t size, couldbetty; register _PTR p; #ifdef __USE_INTERNAL_STAT64 struct stat64 st; #else struct stat st; #endif if (fp->_flags & __SNBF) { fp->_bf._base = fp->_p = fp->_nbuf; fp->_bf._size = 1; return; } #ifdef __USE_INTERNAL_STAT64 if (fp->_file < 0 || _fstat64_r (ptr, fp->_file, &st) < 0) #else if (fp->_file < 0 || _fstat_r (ptr, fp->_file, &st) < 0) #endif { couldbetty = 0; /* Check if we are be called by asprintf family for initial buffer. */ if (fp->_flags & __SMBF) size = _DEFAULT_ASPRINTF_BUFSIZE; else size = BUFSIZ; /* do not try to optimise fseek() */ fp->_flags |= __SNPT; } else { couldbetty = (st.st_mode & S_IFMT) == S_IFCHR; #ifdef HAVE_BLKSIZE size = st.st_blksize <= 0 ? BUFSIZ : st.st_blksize; #else size = BUFSIZ; #endif /* * Optimize fseek() only if it is a regular file. * (The test for __sseek is mainly paranoia.) */ if ((st.st_mode & S_IFMT) == S_IFREG && fp->_seek == __sseek) { fp->_flags |= __SOPT; #ifdef HAVE_BLKSIZE fp->_blksize = st.st_blksize; #else fp->_blksize = 1024; #endif } else fp->_flags |= __SNPT; } if ((p = _malloc_r (ptr, size)) == NULL) { if (!(fp->_flags & __SSTR)) { fp->_flags |= __SNBF; fp->_bf._base = fp->_p = fp->_nbuf; fp->_bf._size = 1; } } else { ptr->__cleanup = _cleanup_r; fp->_flags |= __SMBF; fp->_bf._base = fp->_p = (unsigned char *) p; fp->_bf._size = size; if (couldbetty && _isatty_r (ptr, fp->_file)) fp->_flags |= __SLBF; } }
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