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1# getline.m4 serial 30
2
3dnl Copyright (C) 1998-2003, 2005-2007, 2009-2023 Free Software Foundation,
4dnl Inc.
5dnl
6dnl This file is free software; the Free Software Foundation
7dnl gives unlimited permission to copy and/or distribute it,
8dnl with or without modifications, as long as this notice is preserved.
9
10AC_PREREQ([2.59])
11
12dnl See if there's a working, system-supplied version of the getline function.
13dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems
14dnl have a function by that name in -linet that doesn't have anything
15dnl to do with the function we need.
16AC_DEFUN([gl_FUNC_GETLINE],
17[
18 AC_REQUIRE([gl_STDIO_H_DEFAULTS])
19 AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
20
21 dnl Persuade glibc <stdio.h> to declare getline().
22 AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
23
24 AC_CHECK_DECLS_ONCE([getline])
25
26 gl_getline_needs_run_time_check=no
27 AC_CHECK_FUNC([getline],
28 [dnl Found it in some library. Verify that it works.
29 gl_getline_needs_run_time_check=yes],
30 [am_cv_func_working_getline=no])
31 if test $gl_getline_needs_run_time_check = yes; then
32 AC_CACHE_CHECK([for working getline function],
33 [am_cv_func_working_getline],
34 [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
35 AC_RUN_IFELSE([AC_LANG_SOURCE([[
36# include <stdio.h>
37# include <stdlib.h>
38# include <string.h>
39 int main ()
40 {
41 FILE *in = fopen ("./conftest.data", "r");
42 if (!in)
43 return 1;
44 {
45 /* Test result for a NULL buffer and a zero size.
46 Based on a test program from Karl Heuer. */
47 char *line = NULL;
48 size_t siz = 0;
49 int len = getline (&line, &siz, in);
50 if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
51 { free (line); fclose (in); return 2; }
52 free (line);
53 }
54 {
55 /* Test result for a NULL buffer and a non-zero size.
56 This crashes on FreeBSD 8.0. */
57 char *line = NULL;
58 size_t siz = (size_t)(~0) / 4;
59 if (getline (&line, &siz, in) == -1)
60 { fclose (in); return 3; }
61 free (line);
62 }
63 fclose (in);
64 return 0;
65 }
66 ]])],
67 [am_cv_func_working_getline=yes],
68 [am_cv_func_working_getline=no],
69 [dnl We're cross compiling.
70 dnl Guess it works on glibc2 systems and musl systems.
71 AC_EGREP_CPP([Lucky GNU user],
72 [
73#include <features.h>
74#ifdef __GNU_LIBRARY__
75 #if (__GLIBC__ >= 2) && !defined __UCLIBC__
76 Lucky GNU user
77 #endif
78#endif
79 ],
80 [am_cv_func_working_getline="guessing yes"],
81 [case "$host_os" in
82 *-musl*) am_cv_func_working_getline="guessing yes" ;;
83 *) am_cv_func_working_getline="$gl_cross_guess_normal" ;;
84 esac
85 ])
86 ])
87 ])
88 fi
89
90 if test $ac_cv_have_decl_getline = no; then
91 HAVE_DECL_GETLINE=0
92 fi
93
94 case "$am_cv_func_working_getline" in
95 *yes) ;;
96 *)
97 dnl Set REPLACE_GETLINE always: Even if we have not found the broken
98 dnl getline function among $LIBS, it may exist in libinet and the
99 dnl executable may be linked with -linet.
100 REPLACE_GETLINE=1
101 ;;
102 esac
103])
104
105# Prerequisites of lib/getline.c.
106AC_DEFUN([gl_PREREQ_GETLINE],
107[
108 :
109])