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Annotation of OpenXM_contrib/gmp/mpz/get_str.c, Revision 1.1

1.1     ! maekawa     1: /* mpz_get_str (string, base, mp_src) -- Convert the multiple precision
        !             2:    number MP_SRC to a string STRING of base BASE.  If STRING is NULL
        !             3:    allocate space for the result.  In any case, return a pointer to the
        !             4:    result.  If STRING is not NULL, the caller must ensure enough space is
        !             5:    available to store the result.
        !             6:
        !             7: Copyright (C) 1991, 1993, 1994, 1996 Free Software Foundation, Inc.
        !             8:
        !             9: This file is part of the GNU MP Library.
        !            10:
        !            11: The GNU MP Library is free software; you can redistribute it and/or modify
        !            12: it under the terms of the GNU Library General Public License as published by
        !            13: the Free Software Foundation; either version 2 of the License, or (at your
        !            14: option) any later version.
        !            15:
        !            16: The GNU MP Library is distributed in the hope that it will be useful, but
        !            17: WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
        !            18: or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
        !            19: License for more details.
        !            20:
        !            21: You should have received a copy of the GNU Library General Public License
        !            22: along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
        !            23: the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
        !            24: MA 02111-1307, USA. */
        !            25:
        !            26: #include "gmp.h"
        !            27: #include "gmp-impl.h"
        !            28:
        !            29: char *
        !            30: #if __STDC__
        !            31: mpz_get_str (char *res_str, int base, mpz_srcptr x)
        !            32: #else
        !            33: mpz_get_str (res_str, base, x)
        !            34:      char *res_str;
        !            35:      int base;
        !            36:      mpz_srcptr x;
        !            37: #endif
        !            38: {
        !            39:   mp_ptr xp;
        !            40:   mp_size_t x_size = x->_mp_size;
        !            41:   unsigned char *str;
        !            42:   char *return_str;
        !            43:   size_t str_size;
        !            44:   char *num_to_text;
        !            45:   int i;
        !            46:   TMP_DECL (marker);
        !            47:
        !            48:   TMP_MARK (marker);
        !            49:   if (base >= 0)
        !            50:     {
        !            51:       if (base == 0)
        !            52:        base = 10;
        !            53:       num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
        !            54:     }
        !            55:   else
        !            56:     {
        !            57:       base = -base;
        !            58:       num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
        !            59:     }
        !            60:
        !            61:   /* We allways allocate space for the string.  If the caller passed a
        !            62:      NULL pointer for RES_STR, we allocate permanent space and return
        !            63:      a pointer to that to the caller.  */
        !            64:   str_size = ((size_t) (ABS (x_size) * BITS_PER_MP_LIMB
        !            65:                        * __mp_bases[base].chars_per_bit_exactly)) + 3;
        !            66:   if (res_str == 0)
        !            67:     {
        !            68:       /* We didn't get a string from the user.  Allocate one (and return
        !            69:         a pointer to it).  */
        !            70:       res_str = (char *) (*_mp_allocate_func) (str_size);
        !            71:       /* Make str, the variable used for raw result from mpn_get_str,
        !            72:         point to the same string, but just after a possible minus sign.  */
        !            73:       str = (unsigned char *) res_str + 1;
        !            74:     }
        !            75:   else
        !            76:     {
        !            77:       /* Use TMP_ALLOC to get temporary space, since we need a few extra bytes
        !            78:         that we can't expect to caller to supply us with.  */
        !            79:       str = (unsigned char *) TMP_ALLOC (str_size);
        !            80:     }
        !            81:
        !            82:   return_str = res_str;
        !            83:
        !            84:   if (x_size == 0)
        !            85:     {
        !            86:       res_str[0] = '0';
        !            87:       res_str[1] = 0;
        !            88:       TMP_FREE (marker);
        !            89:       return res_str;
        !            90:     }
        !            91:   if (x_size < 0)
        !            92:     {
        !            93:       *res_str++ = '-';
        !            94:       x_size = -x_size;
        !            95:     }
        !            96:
        !            97:   /* Move the number to convert into temporary space, since mpn_get_str
        !            98:      clobbers its argument + needs one extra high limb....  */
        !            99:   xp = (mp_ptr) TMP_ALLOC ((x_size + 1) * BYTES_PER_MP_LIMB);
        !           100:   MPN_COPY (xp, x->_mp_d, x_size);
        !           101:
        !           102:   str_size = mpn_get_str (str, base, xp, x_size);
        !           103:
        !           104:   /* mpn_get_str might make some leading zeros.  Skip them.  */
        !           105:   while (*str == 0)
        !           106:     {
        !           107:       str_size--;
        !           108:       str++;
        !           109:     }
        !           110:
        !           111:   /* Translate result to printable chars and move result to RES_STR.  */
        !           112:   for (i = 0; i < str_size; i++)
        !           113:     res_str[i] = num_to_text[str[i]];
        !           114:   res_str[str_size] = 0;
        !           115:
        !           116:   TMP_FREE (marker);
        !           117:   return return_str;
        !           118: }