m4/getdelim.m4

   1 # getdelim.m4 serial 10
   2
   3 dnl Copyright (C) 2005-2007, 2009-2013 Free Software Foundation, Inc.
   4 dnl
   5 dnl This file is free software; the Free Software Foundation
   6 dnl gives unlimited permission to copy and/or distribute it,
   7 dnl with or without modifications, as long as this notice is preserved.
   8
   9 AC_PREREQ([2.59])
  10
  11 AC_DEFUN([gl_FUNC_GETDELIM],
  12 [
  13   AC_REQUIRE([gl_STDIO_H_DEFAULTS])
  14
  15   dnl Persuade glibc <stdio.h> to declare getdelim().
  16   AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
  17
  18   AC_CHECK_DECLS_ONCE([getdelim])
  19
  20   AC_CHECK_FUNCS_ONCE([getdelim])
  21   if test $ac_cv_func_getdelim = yes; then
  22     HAVE_GETDELIM=1
  23     dnl Found it in some library.  Verify that it works.
  24     AC_CACHE_CHECK([for working getdelim function], [gl_cv_func_working_getdelim],
  25     [echo fooNbarN | tr -d '\012' | tr N '\012' > conftest.data
  26     AC_RUN_IFELSE([AC_LANG_SOURCE([[
  27 #    include <stdio.h>
  28 #    include <stdlib.h>
  29 #    include <string.h>
  30     int main ()
  31     {
  32       FILE *in = fopen ("./conftest.data", "r");
  33       if (!in)
  34         return 1;
  35       {
  36         /* Test result for a NULL buffer and a zero size.
  37            Based on a test program from Karl Heuer.  */
  38         char *line = NULL;
  39         size_t siz = 0;
  40         int len = getdelim (&line, &siz, '\n', in);
  41         if (!(len == 4 && line && strcmp (line, "foo\n") == 0))
  42           return 2;
  43       }
  44       {
  45         /* Test result for a NULL buffer and a non-zero size.
  46            This crashes on FreeBSD 8.0.  */
  47         char *line = NULL;
  48         size_t siz = (size_t)(~0) / 4;
  49         if (getdelim (&line, &siz, '\n', in) == -1)
  50           return 3;
  51       }
  52       return 0;
  53     }
  54     ]])], [gl_cv_func_working_getdelim=yes] dnl The library version works.
  55     , [gl_cv_func_working_getdelim=no] dnl The library version does NOT work.
  56     , dnl We're cross compiling. Assume it works on glibc2 systems.
  57       [AC_EGREP_CPP([Lucky GNU user],
  58          [
  59 #include <features.h>
  60 #ifdef __GNU_LIBRARY__
  61  #if (__GLIBC__ >= 2) && !defined __UCLIBC__
  62   Lucky GNU user
  63  #endif
  64 #endif
  65          ],
  66          [gl_cv_func_working_getdelim="guessing yes"],
  67          [gl_cv_func_working_getdelim="guessing no"])]
  68     )])
  69     case "$gl_cv_func_working_getdelim" in
  70       *no)
  71         REPLACE_GETDELIM=1
  72         ;;
  73     esac
  74   else
  75     HAVE_GETDELIM=0
  76   fi
  77
  78   if test $ac_cv_have_decl_getdelim = no; then
  79     HAVE_DECL_GETDELIM=0
  80   fi
  81 ])
  82
  83 # Prerequisites of lib/getdelim.c.
  84 AC_DEFUN([gl_PREREQ_GETDELIM],
  85 [
  86   AC_CHECK_FUNCS([flockfile funlockfile])
  87   AC_CHECK_DECLS([getc_unlocked])
  88 ])