summaryrefslogtreecommitdiff
path: root/m4
diff options
context:
space:
mode:
authorJim Meyering <jim@meyering.net>2004-11-14 08:49:46 +0000
committerJim Meyering <jim@meyering.net>2004-11-14 08:49:46 +0000
commitcf53828748e5ef1b32d53a34f55685b3def2e305 (patch)
treec5642a67bf3cad4482dff1e8cafe5674235d46c8 /m4
parent16fb1d072c752d92843174421ff8e869aba77f70 (diff)
downloadcoreutils-cf53828748e5ef1b32d53a34f55685b3def2e305.tar.xz
restore file, now that closeout needs the function again
Diffstat (limited to 'm4')
-rw-r--r--m4/fpending.m472
1 files changed, 72 insertions, 0 deletions
diff --git a/m4/fpending.m4 b/m4/fpending.m4
new file mode 100644
index 000000000..d086ac635
--- /dev/null
+++ b/m4/fpending.m4
@@ -0,0 +1,72 @@
+#serial 4
+
+dnl From Jim Meyering
+dnl Using code from emacs, based on suggestions from Paul Eggert
+dnl and Ulrich Drepper.
+
+dnl Find out how to determine the number of pending output bytes on a stream.
+dnl glibc (2.1.93 and newer) and Solaris provide __fpending. On other systems,
+dnl we have to grub around in the FILE struct.
+
+AC_DEFUN([gl_FUNC_FPENDING],
+[
+ AC_CHECK_HEADERS(stdio_ext.h)
+ AC_REPLACE_FUNCS([__fpending])
+ fp_headers='
+# if HAVE_STDIO_EXT_H
+# include <stdio_ext.h>
+# endif
+'
+ AC_CHECK_DECLS([__fpending], , , $fp_headers)
+ if test $ac_cv_func___fpending = no; then
+ AC_CACHE_CHECK(
+ [how to determine the number of pending output bytes on a stream],
+ ac_cv_sys_pending_output_n_bytes,
+ [
+ for ac_expr in \
+ \
+ '# glibc2' \
+ 'fp->_IO_write_ptr - fp->_IO_write_base' \
+ \
+ '# traditional Unix' \
+ 'fp->_ptr - fp->_base' \
+ \
+ '# BSD' \
+ 'fp->_p - fp->_bf._base' \
+ \
+ '# SCO, Unixware' \
+ 'fp->__ptr - fp->__base' \
+ \
+ '# old glibc?' \
+ 'fp->__bufp - fp->__buffer' \
+ \
+ '# old glibc iostream?' \
+ 'fp->_pptr - fp->_pbase' \
+ \
+ '# VMS' \
+ '(*fp)->_ptr - (*fp)->_base' \
+ \
+ '# e.g., DGUX R4.11; the info is not available' \
+ 1 \
+ ; do
+
+ # Skip each embedded comment.
+ case "$ac_expr" in '#'*) continue;; esac
+
+ AC_TRY_COMPILE(
+ [#include <stdio.h>
+ ],
+ [FILE *fp = stdin; (void) ($ac_expr);],
+ fp_done=yes
+ )
+ test "$fp_done" = yes && break
+ done
+
+ ac_cv_sys_pending_output_n_bytes=$ac_expr
+ ]
+ )
+ AC_DEFINE_UNQUOTED(PENDING_OUTPUT_N_BYTES,
+ $ac_cv_sys_pending_output_n_bytes,
+ [the number of pending output bytes on stream `fp'])
+ fi
+])