gnulib/import/m4/getline.m4

   1 # getline.m4 serial 30
   2
   3 dnl Copyright (C) 1998-2003, 2005-2007, 2009-2021 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   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.
 106 AC_DEFUN([gl_PREREQ_GETLINE],
 107 [
 108   :
 109 ])