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Annotation of GNUtools/libg++/libio/filedoalloc.c, revision 1.1.1.1

1.1       root        1: /* 
                      2: Copyright (C) 1993 Free Software Foundation
                      3: 
                      4: This file is part of the GNU IO Library.  This library is free
                      5: software; you can redistribute it and/or modify it under the
                      6: terms of the GNU General Public License as published by the
                      7: Free Software Foundation; either version 2, or (at your option)
                      8: any later version.
                      9: 
                     10: This library is distributed in the hope that it will be useful,
                     11: but WITHOUT ANY WARRANTY; without even the implied warranty of
                     12: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     13: GNU General Public License for more details.
                     14: 
                     15: You should have received a copy of the GNU General Public License
                     16: along with GNU CC; see the file COPYING.  If not, write to
                     17: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
                     18: 
                     19: As a special exception, if you link this library with files
                     20: compiled with a GNU compiler to produce an executable, this does not cause
                     21: the resulting executable to be covered by the GNU General Public License.
                     22: This exception does not however invalidate any other reasons why
                     23: the executable file might be covered by the GNU General Public License. */
                     24: 
                     25: /*
                     26:  * Copyright (c) 1990 The Regents of the University of California.
                     27:  * All rights reserved.
                     28:  *
                     29:  * Redistribution and use in source and binary forms are permitted
                     30:  * provided that the above copyright notice and this paragraph are
                     31:  * duplicated in all such forms and that any documentation,
                     32:  * advertising materials, and other materials related to such
                     33:  * distribution and use acknowledge that the software was developed
                     34:  * by the University of California, Berkeley.  The name of the
                     35:  * University may not be used to endorse or promote products derived
                     36:  * from this software without specific prior written permission.
                     37:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     38:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     39:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     40:  */
                     41: 
                     42: /* Modified for GNU iostream by Per Bothner 1991, 1992. */
                     43: 
                     44: #define _POSIX_SOURCE
                     45: #include "libioP.h"
                     46: #include <sys/types.h>
                     47: #include <sys/stat.h>
                     48: 
                     49: /* If this function pointer is non-zero, we should call it.
                     50:    It's supposed to make sure _IO_flush_all gets called on exit.
                     51:    We call it from _IO_file_doallocate, since that is likely
                     52:    to get called by any program that does buffered I/O. */
                     53: void (*_IO_cleanup_registration_needed)();
                     54: 
                     55: /*
                     56:  * Allocate a file buffer, or switch to unbuffered I/O.
                     57:  * Per the ANSI C standard, ALL tty devices default to line buffered.
                     58:  *
                     59:  * As a side effect, we set __SOPT or __SNPT (en/dis-able fseek
                     60:  * optimisation) right after the _fstat() that finds the buffer size.
                     61:  */
                     62: 
                     63: int
                     64: _IO_file_doallocate(fp)
                     65:      register _IO_FILE *fp;
                     66: {
                     67:   register _IO_size_t size;
                     68:   int couldbetty;
                     69:   register char *p;
                     70:   struct stat st;
                     71: 
                     72:   if (_IO_cleanup_registration_needed)
                     73:     (*_IO_cleanup_registration_needed)();
                     74:   
                     75:   if (fp->_fileno < 0 || fp->_jumps->__stat(fp, &st) < 0)
                     76:     {
                     77:       couldbetty = 0;
                     78:       size = _IO_BUFSIZ;
                     79: #if 0
                     80:       /* do not try to optimise fseek() */
                     81:       fp->_flags |= __SNPT;
                     82: #endif
                     83:     }
                     84:   else
                     85:     {
                     86:       couldbetty = S_ISCHR(st.st_mode);
                     87: #if _IO_HAVE_ST_BLKSIZE
                     88:       size = st.st_blksize <= 0 ? _IO_BUFSIZ : st.st_blksize;
                     89: #else
                     90:       size = _IO_BUFSIZ;
                     91: #endif
                     92:     }
                     93: #ifdef USE_MALLOC_BUF
                     94:   if ((p = malloc(size)) == NULL) {
                     95:     unbuffered(1); /* FIXME */
                     96:     /* fp->_bf._IO_buf_base = fp->_p = fp->_nbuf; */
                     97:     /*         fp->_bf._size = 1; */
                     98:     return EOF;
                     99:   }
                    100: #else
                    101:   p = ALLOC_BUF(size);
                    102: #endif
                    103:   _IO_setb(fp, p, p+size, 1);
                    104:   if (couldbetty && isatty(fp->_fileno))
                    105:     fp->_flags |= _IO_LINE_BUF;
                    106:   return 1;
                    107: }

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