4 dnl Copyright (C) 1998-2003, 2005-2007, 2009-2024 Free Software Foundation,
7 dnl This file is free software; the Free Software Foundation
8 dnl gives unlimited permission to copy and/or distribute it,
9 dnl with or without modifications, as long as this notice is preserved.
13 dnl See if there's a working, system-supplied version of the getline function.
14 dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems
15 dnl have a function by that name in -linet that doesn't have anything
16 dnl to do with the function we need.
17 AC_DEFUN([gl_FUNC_GETLINE],
19 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
20 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
22 dnl Persuade glibc <stdio.h> to declare getline().
23 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
25 AC_CHECK_DECLS_ONCE([getline])
27 gl_CHECK_FUNCS_ANDROID([getline], [[#include <stdio.h>]])
28 if test $ac_cv_func_getline = yes; then
29 dnl Found it in some library. Verify that it works.
30 AC_CACHE_CHECK([for working getline function],
31 [am_cv_func_working_getline],
32 [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
33 AC_RUN_IFELSE([AC_LANG_SOURCE([[
39 FILE *in = fopen ("./conftest.data", "r");
43 /* Test result for a NULL buffer and a zero size.
44 Based on a test program from Karl Heuer. */
47 int len = getline (&line, &siz, in);
48 if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
49 { free (line); fclose (in); return 2; }
53 /* Test result for a NULL buffer and a non-zero size.
54 This crashes on FreeBSD 8.0. */
56 size_t siz = (size_t)(~0) / 4;
57 if (getline (&line, &siz, in) == -1)
58 { fclose (in); return 3; }
65 [am_cv_func_working_getline=yes],
66 [am_cv_func_working_getline=no],
67 [dnl We're cross compiling.
68 dnl Guess it works on glibc2 systems and musl systems.
69 AC_EGREP_CPP([Lucky GNU user],
72 #ifdef __GNU_LIBRARY__
73 #if (__GLIBC__ >= 2) && !defined __UCLIBC__
78 [am_cv_func_working_getline="guessing yes"],
80 *-musl* | midipix*) am_cv_func_working_getline="guessing yes" ;;
81 *) am_cv_func_working_getline="$gl_cross_guess_normal" ;;
87 am_cv_func_working_getline=no
88 case "$gl_cv_onwards_func_getline" in
89 future*) REPLACE_GETLINE=1 ;;
93 if test $ac_cv_have_decl_getline = no; then
97 case "$am_cv_func_working_getline" in
100 dnl Set REPLACE_GETLINE always: Even if we have not found the broken
101 dnl getline function among $LIBS, it may exist in libinet and the
102 dnl executable may be linked with -linet.
108 # Prerequisites of lib/getline.c.
109 AC_DEFUN([gl_PREREQ_GETLINE],