1 /* mpz_set_str(mp_dest, string, base) -- Convert the \0-terminated
2 string STRING in base BASE to multiple precision integer in
3 MP_DEST. Allow white space in the string. If BASE == 0 determine
4 the base in the C standard way, i.e. 0xhh...h means base 16,
5 0oo...o means base 8, otherwise assume base 10.
7 Copyright 1991, 1993, 1994, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2005
8 Free Software Foundation, Inc.
10 This file is part of the GNU MP Library.
12 The GNU MP Library is free software; you can redistribute it and/or modify
13 it under the terms of the GNU Lesser General Public License as published by
14 the Free Software Foundation; either version 3 of the License, or (at your
15 option) any later version.
17 The GNU MP Library is distributed in the hope that it will be useful, but
18 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
20 License for more details.
22 You should have received a copy of the GNU Lesser General Public License
23 along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
30 extern const unsigned char __gmp_digit_value_tab[];
31 #define digit_value_tab __gmp_digit_value_tab
34 mpz_set_str (mpz_ptr x, const char *str, int base)
42 const unsigned char *digit_value;
45 digit_value = digit_value_tab;
48 /* For bases > 36, use the collating sequence
49 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz. */
52 return -1; /* too large base */
55 /* Skip whitespace. */
57 c = (unsigned char) *str++;
64 c = (unsigned char) *str++;
67 if (digit_value[c] >= (base == 0 ? 10 : base))
68 return -1; /* error if no valid digits */
70 /* If BASE is 0, try to find out the base by looking at the initial
78 c = (unsigned char) *str++;
79 if (c == 'x' || c == 'X')
82 c = (unsigned char) *str++;
84 else if (c == 'b' || c == 'B')
87 c = (unsigned char) *str++;
92 /* Skip leading zeros and white space. */
93 while (c == '0' || isspace (c))
94 c = (unsigned char) *str++;
95 /* Make sure the string does not become empty, mpn_set_str would fail. */
103 str_size = strlen (str - 1);
104 s = begs = (char *) TMP_ALLOC (str_size + 1);
106 /* Remove spaces from the string and convert the result from ASCII to a
108 for (i = 0; i < str_size; i++)
112 int dig = digit_value[c];
120 c = (unsigned char) *str++;
125 xsize = (((mp_size_t) (str_size / __mp_bases[base].chars_per_bit_exactly))
126 / GMP_NUMB_BITS + 2);
127 MPZ_REALLOC (x, xsize);
129 /* Convert the byte array in base BASE to our bignum format. */
130 xsize = mpn_set_str (x->_mp_d, (unsigned char *) begs, str_size, base);
131 x->_mp_size = negative ? -xsize : xsize;