compiler/stdc/strtoll.c

   1 /*
   2     Copyright © 1995-2012, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     C99 function strtoll().
   6 */
   7
   8 /* This requires the C99 type long long. */
   9
  10 #include <aros/system.h>
  11 #if defined(AROS_HAVE_LONG_LONG)
  12
  13 #include <ctype.h>
  14 #include <errno.h>
  15 #ifndef AROS_NO_LIMITS_H
  16 #       include <limits.h>
  17 #else
  18 #       define LLONG_MAX        0x7fffffffffffffffLL
  19 #       define LLONG_MIN        (-0x7fffffffffffffffLL - 1)
  20 #endif
  21
  22 /*****************************************************************************
  23
  24     NAME */
  25 #include <stdlib.h>
  26
  27         long long strtoll (
  28
  29 /*  SYNOPSIS */
  30         const char * restrict   str,
  31         char      ** restrict   endptr,
  32         int                     base)
  33
  34 /*  FUNCTION
  35         Convert a string of digits into an integer according to the
  36         given base.
  37
  38     INPUTS
  39         str - The string which should be converted. Leading
  40                 whitespace are ignored. The number may be prefixed
  41                 by a '+' or '-'. If base is above 10, then the
  42                 alphabetic characters from 'A' are used to specify
  43                 digits above 9 (ie. 'A' or 'a' is 10, 'B' or 'b' is
  44                 11 and so on until 'Z' or 'z' is 35).
  45         endptr - If this is non-NULL, then the address of the first
  46                 character after the number in the string is stored
  47                 here.
  48         base - The base for the number. May be 0 or between 2 and 36,
  49                 including both. 0 means to autodetect the base. strtoul()
  50                 selects the base by inspecting the first characters
  51                 of the string. If they are "0x", then base 16 is
  52                 assumed. If they are "0", then base 8 is assumed. Any
  53                 other digit will assume base 10. This is like in C.
  54
  55                 If you give base 16, then an optional "0x" may
  56                 precede the number in the string.
  57
  58     RESULT
  59         The value of the string. The first character after the number
  60         is returned in *endptr, if endptr is non-NULL. If no digits can
  61         be converted, *endptr contains str (if non-NULL) and 0 is
  62         returned.
  63
  64     NOTES
  65
  66     EXAMPLE
  67         // returns 1, ptr points to the 0-Byte
  68         strtoll ("  \t +0x1", &ptr, 0);
  69
  70         // Returns 15. ptr points to the a
  71         strtoll ("017a", &ptr, 0);
  72
  73         // Returns 215 (5*36 + 35)
  74         strtoll ("5z", &ptr, 36);
  75
  76     BUGS
  77
  78     SEE ALSO
  79         strtoull()
  80
  81     INTERNALS
  82
  83 ******************************************************************************/
  84 {
  85     long long   val     = 0;
  86     char        * ptr;
  87     char        * copy;
  88
  89     while (isspace (*str))
  90         str ++;
  91
  92     copy = (char *)str;
  93
  94     if (*str)
  95     {
  96         val = strtoull (str, &ptr, base);
  97
  98         if (endptr)
  99         {
 100             if (ptr == str)
 101                 str = copy;
 102             else
 103                 str = ptr;
 104         }
 105
 106         /* Remember: strtoull() has already done the sign conversion */
 107         if (*copy == '-')
 108         {
 109             if ((signed long long)val > 0)
 110             {
 111                 errno = ERANGE;
 112                 val = LLONG_MIN;
 113             }
 114         }
 115         else
 116         {
 117             if ((signed long long)val < 0)
 118             {
 119                 errno = ERANGE;
 120                 val = LLONG_MAX;
 121             }
 122         }
 123     }
 124
 125     if (endptr)
 126         *endptr = (char *)str;
 127
 128     return val;
 129 } /* strtoll */
 130
 131 #endif /* AROS_HAVE_LONG_LONG */