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      1 # getline.m4 serial 26
      2 
      3 dnl Copyright (C) 1998-2003, 2005-2007, 2009-2012 Free Software Foundation,
      4 dnl Inc.
      5 dnl
      6 dnl This file is free software; the Free Software Foundation
      7 dnl gives unlimited permission to copy and/or distribute it,
      8 dnl with or without modifications, as long as this notice is preserved.
      9 
     10 AC_PREREQ([2.59])
     11 
     12 dnl See if there's a working, system-supplied version of the getline function.
     13 dnl We can't just do AC_REPLACE_FUNCS([getline]) because some systems
     14 dnl have a function by that name in -linet that doesn't have anything
     15 dnl to do with the function we need.
     16 AC_DEFUN([gl_FUNC_GETLINE],
     17 [
     18   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
     19 
     20   dnl Persuade glibc <stdio.h> to declare getline().
     21   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
     22 
     23   AC_CHECK_DECLS_ONCE([getline])
     24 
     25   gl_getline_needs_run_time_check=no
     26   AC_CHECK_FUNC([getline],
     27                 [dnl Found it in some library.  Verify that it works.
     28                  gl_getline_needs_run_time_check=yes],
     29                 [am_cv_func_working_getline=no])
     30   if test $gl_getline_needs_run_time_check = yes; then
     31     AC_CACHE_CHECK([for working getline function], [am_cv_func_working_getline],
     32     [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
     33     AC_RUN_IFELSE([AC_LANG_SOURCE([[
     34 #    include <stdio.h>
     35 #    include <stdlib.h>
     36 #    include <string.h>
     37     int main ()
     38     {
     39       FILE *in = fopen ("./conftest.data", "r");
     40       if (!in)
     41         return 1;
     42       {
     43         /* Test result for a NULL buffer and a zero size.
     44            Based on a test program from Karl Heuer.  */
     45         char *line = NULL;
     46         size_t siz = 0;
     47         int len = getline (&line, &siz, in);
     48         if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
     49           return 2;
     50       }
     51       {
     52         /* Test result for a NULL buffer and a non-zero size.
     53            This crashes on FreeBSD 8.0.  */
     54         char *line = NULL;
     55         size_t siz = (size_t)(~0) / 4;
     56         if (getline (&line, &siz, in) == -1)
     57           return 3;
     58       }
     59       return 0;
     60     }
     61     ]])], [am_cv_func_working_getline=yes] dnl The library version works.
     62     , [am_cv_func_working_getline=no] dnl The library version does NOT work.
     63     , dnl We're cross compiling. Assume it works on glibc2 systems.
     64       [AC_EGREP_CPP([Lucky GNU user],
     65          [
     66 #include <features.h>
     67 #ifdef __GNU_LIBRARY__
     68  #if (__GLIBC__ >= 2) && !defined __UCLIBC__
     69   Lucky GNU user
     70  #endif
     71 #endif
     72          ],
     73          [am_cv_func_working_getline="guessing yes"],
     74          [am_cv_func_working_getline="guessing no"])]
     75     )])
     76   fi
     77 
     78   if test $ac_cv_have_decl_getline = no; then
     79     HAVE_DECL_GETLINE=0
     80   fi
     81 
     82   case "$am_cv_func_working_getline" in
     83     *no)
     84       dnl Set REPLACE_GETLINE always: Even if we have not found the broken
     85       dnl getline function among $LIBS, it may exist in libinet and the
     86       dnl executable may be linked with -linet.
     87       REPLACE_GETLINE=1
     88       ;;
     89   esac
     90 ])
     91 
     92 # Prerequisites of lib/getline.c.
     93 AC_DEFUN([gl_PREREQ_GETLINE],
     94 [
     95   :
     96 ])
     97