1# getline.m4 serial 19
2
3dnl Copyright (C) 1998-2003, 2005-2007, 2009 Free Software Foundation, Inc.
4dnl
5dnl This file is free software; the Free Software Foundation
6dnl gives unlimited permission to copy and/or distribute it,
7dnl with or without modifications, as long as this notice is preserved.
8
9AC_PREREQ([2.59])
10
11dnl See if there's a working, system-supplied version of the getline function.
12dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems
13dnl have a function by that name in -linet that doesn't have anything
14dnl to do with the function we need.
15AC_DEFUN([gl_FUNC_GETLINE],
16[
17  AC_REQUIRE([gl_STDIO_H_DEFAULTS])
18
19  dnl Persuade glibc <stdio.h> to declare getline().
20  AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
21
22  AC_CHECK_DECLS_ONCE([getline])
23
24  gl_getline_needs_run_time_check=no
25  AC_CHECK_FUNC([getline],
26		dnl Found it in some library.  Verify that it works.
27		gl_getline_needs_run_time_check=yes,
28		am_cv_func_working_getline=no)
29  if test $gl_getline_needs_run_time_check = yes; then
30    AC_CACHE_CHECK([for working getline function], [am_cv_func_working_getline],
31    [echo fooN |tr -d '\012'|tr N '\012' > conftest.data
32    AC_TRY_RUN([
33#    include <stdio.h>
34#    include <stdlib.h>
35#    include <string.h>
36    int main ()
37    { /* Based on a test program from Karl Heuer.  */
38      char *line = NULL;
39      size_t siz = 0;
40      int len;
41      FILE *in = fopen ("./conftest.data", "r");
42      if (!in)
43	return 1;
44      len = getline (&line, &siz, in);
45      exit ((len == 4 && line && strcmp (line, "foo\n") == 0) ? 0 : 1);
46    }
47    ], am_cv_func_working_getline=yes dnl The library version works.
48    , am_cv_func_working_getline=no dnl The library version does NOT work.
49    , dnl We're cross compiling. Assume it works on glibc2 systems.
50      [AC_EGREP_CPP([Lucky GNU user],
51         [
52#include <features.h>
53#ifdef __GNU_LIBRARY__
54 #if (__GLIBC__ >= 2)
55  Lucky GNU user
56 #endif
57#endif
58         ],
59         [am_cv_func_working_getline=yes],
60         [am_cv_func_working_getline=no])]
61    )])
62  fi
63
64  if test $ac_cv_have_decl_getline = no; then
65    HAVE_DECL_GETLINE=0
66  fi
67
68  if test $am_cv_func_working_getline = no; then
69    REPLACE_GETLINE=1
70    AC_LIBOBJ([getline])
71
72    gl_PREREQ_GETLINE
73  fi
74])
75
76# Prerequisites of lib/getline.c.
77AC_DEFUN([gl_PREREQ_GETLINE],
78[
79  gl_FUNC_GETDELIM
80])
81