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inc/inc_Config-AutoConf/Config/AutoConf.pm  view on Meta::CPAN

sub looks_like_number {
    local $_ = shift;

    # checks from perlfaq4
    return 0 if !defined($_);
    if (ref($_)) {
        return overload::Overloaded($_) ? defined(0 + $_) : 0;
    }
    return 1 if (/^[+-]?[0-9]+$/); # is a +/- integer
    return 1 if (/^([+-]?)(?=[0-9]|\.[0-9])[0-9]*(\.[0-9]*)?([Ee]([+-]?[0-9]+))?$/); # a C float
    return 1 if ($] >= 5.008 and /^(Inf(inity)?|NaN)$/i) or ($] >= 5.006001 and /^Inf$/i);

    0;
}
EOP

eval "use File::Slurp::Tiny qw/read_file/;";
__PACKAGE__->can("read_file") or eval <<'EOP';
=begin private

=head2 read_file

ppport.h  view on Meta::CPAN

    s++; if (s == send || (*s != 'F' && *s != 'f')) return 0;
    s++; if (s < send && (*s == 'I' || *s == 'i')) {
      s++; if (s == send || (*s != 'N' && *s != 'n')) return 0;
      s++; if (s == send || (*s != 'I' && *s != 'i')) return 0;
      s++; if (s == send || (*s != 'T' && *s != 't')) return 0;
      s++; if (s == send || (*s != 'Y' && *s != 'y')) return 0;
      s++;
    }
    sawinf = 1;
  } else if (*s == 'N' || *s == 'n') {
    /* XXX TODO: There are signaling NaNs and quiet NaNs. */
    s++; if (s == send || (*s != 'A' && *s != 'a')) return 0;
    s++; if (s == send || (*s != 'N' && *s != 'n')) return 0;
    s++;
    sawnan = 1;
  } else
    return 0;

  if (sawinf) {
    numtype &= IS_NUMBER_NEG; /* Keep track of sign  */
    numtype |= IS_NUMBER_INFINITY | IS_NUMBER_NOT_INT;