1 # getdelim.m4 serial 12
3 dnl Copyright (C) 2005-2007, 2009-2018 Free Software Foundation, Inc.
5 dnl This file is free software; the Free Software Foundation
6 dnl gives unlimited permission to copy and/or distribute it,
7 dnl with or without modifications, as long as this notice is preserved.
11 AC_DEFUN([gl_FUNC_GETDELIM],
13 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
15 dnl Persuade glibc <stdio.h> to declare getdelim().
16 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
18 AC_CHECK_DECLS_ONCE([getdelim])
20 AC_CHECK_FUNCS_ONCE([getdelim])
21 if test $ac_cv_func_getdelim = yes; then
23 dnl Found it in some library. Verify that it works.
24 AC_CACHE_CHECK([for working getdelim function], [gl_cv_func_working_getdelim],
25 [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
26 AC_RUN_IFELSE([AC_LANG_SOURCE([[
32 FILE *in = fopen ("./conftest.data", "r");
36 /* Test result for a NULL buffer and a zero size.
37 Based on a test program from Karl Heuer. */
40 int len = getdelim (&line, &siz, '\n', in);
41 if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
42 { free (line); fclose (in); return 2; }
45 /* Test result for a NULL buffer and a non-zero size.
46 This crashes on FreeBSD 8.0. */
48 size_t siz = (size_t)(~0) / 4;
49 if (getdelim (&line, &siz, '\n', in) == -1)
50 { fclose (in); return 3; }
56 ]])], [gl_cv_func_working_getdelim=yes] dnl The library version works.
57 , [gl_cv_func_working_getdelim=no] dnl The library version does NOT work.
58 , dnl We're cross compiling. Assume it works on glibc2 systems.
59 [AC_EGREP_CPP([Lucky GNU user],
62 #ifdef __GNU_LIBRARY__
63 #if (__GLIBC__ >= 2) && !defined __UCLIBC__
68 [gl_cv_func_working_getdelim="guessing yes"],
69 [gl_cv_func_working_getdelim="guessing no"])]
71 case "$gl_cv_func_working_getdelim" in
80 if test $ac_cv_have_decl_getdelim = no; then
85 # Prerequisites of lib/getdelim.c.
86 AC_DEFUN([gl_PREREQ_GETDELIM],
88 AC_CHECK_FUNCS([flockfile funlockfile])
89 AC_CHECK_DECLS([getc_unlocked])