1# getline.m4 serial 30
2
3dnl Copyright (C) 1998-2003, 2005-2007, 2009-2021 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])
110