Home | History | Annotate | Download | only in m4 
      1 # getdelim.m4 serial 10
      2 
      3 dnl Copyright (C) 2005-2007, 2009-2012 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 ])
     89