acinclude.m4

   1 dnl Check longest integer in digits.
   2
   3 AC_DEFUN([BLP_INT_DIGITS],
   4 [
   5 AC_MSG_CHECKING(number of digits in LONG_MIN (incl. sign))
   6 AC_CACHE_VAL(blp_int_digits,
   7              [AC_TRY_RUN([#include <stdio.h>
   8                           #include <limits.h>
   9                           int
  10                           main()
  11                           {
  12                             int len;
  13                             char s[80];
  14                             sprintf(s, "%ld", LONG_MAX);
  15                             len = strlen(s);
  16                             sprintf(s, "%ld", LONG_MIN);
  17                             if(strlen(s)>len) len=strlen(s);
  18                             sprintf(s, "%lu", ULONG_MAX);
  19                             if(strlen(s)>len) len=strlen(s);
  20                             exit(len);
  21                           }
  22                          ],
  23                          eval "blp_int_digits=19",
  24                          eval "blp_int_digits=$?"
  25                          if test "$blp_int_digits" -lt 11; then
  26                            blp_int_digits=11
  27                          fi,
  28                          eval "blp_int_digits=19")
  29              ])
  30 AC_DEFINE_UNQUOTED([INT_DIGITS], $blp_int_digits,
  31         [Number of digits in longest `long' value, including sign.
  32          This is usually 11, for 32-bit `long's, or 19, for 64-bit
  33          `long's.])
  34 AC_MSG_RESULT($blp_int_digits) ])dnl
  35
  36 dnl Check quality of this machine's sprintf implementation.
  37
  38 AC_DEFUN([BLP_IS_SPRINTF_GOOD],
  39 [
  40 AC_MSG_CHECKING(if sprintf returns a char count)
  41 AC_CACHE_VAL(blp_is_sprintf_good,
  42              [AC_TRY_RUN([#include <stdio.h>
  43                           int
  44                           main()
  45                           {
  46                             char s[8];
  47                             exit((int)sprintf(s, "abcdefg")!=7);
  48                           }
  49                          ],
  50                          eval "blp_is_sprintf_good=yes",
  51                          eval "blp_is_sprintf_good=no",
  52                          eval "blp_is_sprintf_good=no")
  53              ])
  54 if test "$blp_is_sprintf_good" = yes; then
  55   AC_DEFINE([HAVE_GOOD_SPRINTF], 1,
  56         [Define if sprintf() returns the number of characters written
  57          to the destination string, excluding the null terminator.])
  58   AC_MSG_RESULT(yes)
  59 else
  60   AC_MSG_RESULT(no)
  61 fi
  62 ])dnl
  63
  64 dnl Check for proper random number generator.
  65
  66 AC_DEFUN([BLP_RANDOM],
  67 [
  68 AC_MSG_CHECKING(random number generator)
  69 AC_CACHE_VAL(blp_random_good,
  70   AC_TRY_COMPILE([#include <stdlib.h>], [int x=RAND_MAX;],
  71     blp_random_good=yes, blp_random_good=no))
  72 if test "$blp_random_good" = yes; then
  73   AC_DEFINE([HAVE_GOOD_RANDOM], 1,
  74         [Define if rand() and company work according to ANSI.])
  75   AC_MSG_RESULT(good)
  76 else
  77   AC_MSG_RESULT(bad)
  78 fi
  79 ])dnl
  80
  81 dnl aclocal.m4 ends here