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|
# getline.m4
# serial 35
dnl Copyright (C) 1998-2003, 2005-2007, 2009-2026 Free Software
dnl Foundation, Inc.
dnl
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl This file is offered as-is, without any warranty.
AC_PREREQ([2.59])
dnl See if there's a working, system-supplied version of the getline function.
dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems
dnl have a function by that name in -linet that doesn't have anything
dnl to do with the function we need.
AC_DEFUN([gl_FUNC_GETLINE],
[
AC_REQUIRE([gl_STDIO_H_DEFAULTS])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
dnl Persuade glibc <stdio.h> to declare getline().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
AC_CHECK_DECLS_ONCE([getline])
gl_CHECK_FUNCS_ANDROID([getline], [[#include <stdio.h>]])
if test $ac_cv_func_getline = yes; then
dnl Found it in some library. Verify that it works.
AC_CACHE_CHECK([for working getline function],
[am_cv_func_working_getline],
[echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
touch conftest.empty
AC_RUN_IFELSE([AC_LANG_SOURCE([[
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
int main ()
{
FILE *in = fopen ("./conftest.data", "r");
int result = 0;
if (!in)
return 1;
{
/* Test result for a NULL buffer and a zero size.
Based on a test program from Karl Heuer. */
char *line = NULL;
size_t siz = 0;
int len = getline (&line, &siz, in);
if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
result |= 2;
free (line);
}
{
/* Test result for a NULL buffer and a non-zero size.
This crashes on FreeBSD 8.0. */
char *line = NULL;
size_t siz = (size_t)(~0) / 4;
if (getline (&line, &siz, in) == -1)
result |= 4;
free (line);
}
fclose (in);
{
/* Test that reading EOF as the first character sets the first byte
in the buffer to NUL. This fails on glibc 2.42 and earlier. */
in = fopen ("./conftest.empty", "r");
if (!in)
return 1;
char *line = malloc (1);
line[0] = 'A';
size_t siz = 1;
if (getline (&line, &siz, in) != -1 || line[0] != '\0')
result |= 8;
free (line);
}
fclose (in);
return result;
}
]])],
[am_cv_func_working_getline=yes],
[am_cv_func_working_getline=no],
[case "$host_os" in
# Guess yes on musl.
*-musl* | midipix*) am_cv_func_working_getline="guessing yes" ;;
# Guess no on glibc.
*-gnu* | gnu*) am_cv_func_working_getline="guessing no" ;;
*) am_cv_func_working_getline="$gl_cross_guess_normal" ;;
esac
])
rm -f conftest.data conftest.empty
])
else
am_cv_func_working_getline=no
case "$gl_cv_onwards_func_getline" in
future*) REPLACE_GETLINE=1 ;;
esac
fi
if test $ac_cv_have_decl_getline = no; then
HAVE_DECL_GETLINE=0
fi
case "$am_cv_func_working_getline" in
*yes) ;;
*)
dnl Set REPLACE_GETLINE always: Even if we have not found the broken
dnl getline function among $LIBS, it may exist in libinet and the
dnl executable may be linked with -linet.
REPLACE_GETLINE=1
;;
esac
])
# Prerequisites of lib/getline.c.
AC_DEFUN([gl_PREREQ_GETLINE],
[
:
])
|
