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7ccfb720 PE |
1 | # serial 19 |
2 | ||
9ff99d22 | 3 | # Copyright (C) 2000-2001, 2004-2013 Free Software Foundation, Inc. |
7ccfb720 PE |
4 | # This file is free software; the Free Software Foundation |
5 | # gives unlimited permission to copy and/or distribute it, | |
6 | # with or without modifications, as long as this notice is preserved. | |
7 | ||
8 | dnl From Jim Meyering | |
9 | dnl Using code from emacs, based on suggestions from Paul Eggert | |
10 | dnl and Ulrich Drepper. | |
11 | ||
12 | dnl Find out how to determine the number of pending output bytes on a stream. | |
13 | dnl glibc (2.1.93 and newer) and Solaris provide __fpending. On other systems, | |
14 | dnl we have to grub around in the FILE struct. | |
15 | ||
16 | AC_DEFUN([gl_FUNC_FPENDING], | |
17 | [ | |
18 | AC_CHECK_HEADERS_ONCE([stdio_ext.h]) | |
19 | AC_CHECK_FUNCS_ONCE([__fpending]) | |
20 | fp_headers=' | |
21 | # include <stdio.h> | |
22 | # if HAVE_STDIO_EXT_H | |
23 | # include <stdio_ext.h> | |
24 | # endif | |
25 | ' | |
26 | AC_CHECK_DECLS([__fpending], , , $fp_headers) | |
27 | ]) | |
28 | ||
29 | AC_DEFUN([gl_PREREQ_FPENDING], | |
30 | [ | |
31 | AC_CACHE_CHECK( | |
32 | [how to determine the number of pending output bytes on a stream], | |
33 | ac_cv_sys_pending_output_n_bytes, | |
34 | [ | |
35 | for ac_expr in \ | |
36 | \ | |
37 | '# glibc2' \ | |
38 | 'fp->_IO_write_ptr - fp->_IO_write_base' \ | |
39 | \ | |
40 | '# traditional Unix' \ | |
41 | 'fp->_ptr - fp->_base' \ | |
42 | \ | |
43 | '# BSD' \ | |
44 | 'fp->_p - fp->_bf._base' \ | |
45 | \ | |
46 | '# SCO, Unixware' \ | |
47 | '(fp->__ptr ? fp->__ptr - fp->__base : 0)' \ | |
48 | \ | |
49 | '# QNX' \ | |
50 | '(fp->_Mode & 0x2000 /*_MWRITE*/ ? fp->_Next - fp->_Buf : 0)' \ | |
51 | \ | |
52 | '# old glibc?' \ | |
53 | 'fp->__bufp - fp->__buffer' \ | |
54 | \ | |
55 | '# old glibc iostream?' \ | |
56 | 'fp->_pptr - fp->_pbase' \ | |
57 | \ | |
58 | '# emx+gcc' \ | |
59 | 'fp->_ptr - fp->_buffer' \ | |
60 | \ | |
61 | '# Minix' \ | |
62 | 'fp->_ptr - fp->_buf' \ | |
63 | \ | |
64 | '# Plan9' \ | |
65 | 'fp->wp - fp->buf' \ | |
66 | \ | |
67 | '# VMS' \ | |
68 | '(*fp)->_ptr - (*fp)->_base' \ | |
69 | \ | |
70 | '# e.g., DGUX R4.11; the info is not available' \ | |
71 | 1 \ | |
72 | ; do | |
73 | ||
74 | # Skip each embedded comment. | |
75 | case "$ac_expr" in '#'*) continue;; esac | |
76 | ||
77 | AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]], | |
78 | [[FILE *fp = stdin; (void) ($ac_expr);]])], | |
79 | [fp_done=yes] | |
80 | ) | |
81 | test "$fp_done" = yes && break | |
82 | done | |
83 | ||
84 | ac_cv_sys_pending_output_n_bytes=$ac_expr | |
85 | ] | |
86 | ) | |
87 | AC_DEFINE_UNQUOTED([PENDING_OUTPUT_N_BYTES], | |
88 | $ac_cv_sys_pending_output_n_bytes, | |
89 | [the number of pending output bytes on stream 'fp']) | |
90 | ]) |