lib/libc/gdtoa/strtold_subr.c

   1 /* $NetBSD$ */
   2
   3 /*
   4  * Written by Klaus Klein <kleink@NetBSD.org>, November 16, 2005.
   5  * Public domain.
   6  */
   7
   8 /*
   9  * NOTICE: This is not a standalone file.  To use it, #include it in
  10  * the format-specific strtold_*.c, like so:
  11  *
  12  *      #define GDTOA_LD_FMT    <gdtoa extended-precision format code>
  13  *      #include "strtold_subr.c"
  14  */
  15
  16 #include <sys/cdefs.h>
  17 #if defined(LIBC_SCCS) && !defined(lint)
  18 __RCSID("$NetBSD$");
  19 #endif /* LIBC_SCCS and not lint */
  20
  21 #include "namespace.h"
  22 #include <math.h>
  23 #include <stdlib.h>
  24 #include "gdtoa.h"
  25
  26 #ifdef __weak_alias
  27 __weak_alias(strtold, _strtold)
  28 #endif
  29
  30 #ifndef __HAVE_LONG_DOUBLE
  31 #error no extended-precision long double type
  32 #endif
  33
  34 #ifndef GDTOA_LD_FMT
  35 #error GDTOA_LD_FMT must be defined by format-specific source file
  36 #endif
  37
  38 #define STRTOP(x)       __CONCAT(strtop, x)
  39
  40 long double
  41 strtold(const char *nptr, char **endptr)
  42 {
  43         long double ld;
  44
  45         (void)STRTOP(GDTOA_LD_FMT)(nptr, endptr, &ld);
  46         return ld;
  47 }