| Austin Schuh | dace2a6 | 2020-08-18 10:56:48 -0700 | [diff] [blame^] | 1 | /* Auxiliary functions for C++-style input of GMP types. |
| 2 | |
| 3 | Copyright 2001 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the GNU MP Library. |
| 6 | |
| 7 | The GNU MP Library is free software; you can redistribute it and/or modify |
| 8 | it under the terms of either: |
| 9 | |
| 10 | * the GNU Lesser General Public License as published by the Free |
| 11 | Software Foundation; either version 3 of the License, or (at your |
| 12 | option) any later version. |
| 13 | |
| 14 | or |
| 15 | |
| 16 | * the GNU General Public License as published by the Free Software |
| 17 | Foundation; either version 2 of the License, or (at your option) any |
| 18 | later version. |
| 19 | |
| 20 | or both in parallel, as here. |
| 21 | |
| 22 | The GNU MP Library is distributed in the hope that it will be useful, but |
| 23 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 24 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 25 | for more details. |
| 26 | |
| 27 | You should have received copies of the GNU General Public License and the |
| 28 | GNU Lesser General Public License along with the GNU MP Library. If not, |
| 29 | see https://www.gnu.org/licenses/. */ |
| 30 | |
| 31 | #include <cctype> |
| 32 | #include <iostream> |
| 33 | #include <string> |
| 34 | #include "gmp-impl.h" |
| 35 | |
| 36 | using namespace std; |
| 37 | |
| 38 | |
| 39 | int |
| 40 | __gmp_istream_set_base (istream &i, char &c, bool &zero, bool &showbase) |
| 41 | { |
| 42 | int base; |
| 43 | |
| 44 | zero = showbase = false; |
| 45 | switch (i.flags() & ios::basefield) |
| 46 | { |
| 47 | case ios::dec: |
| 48 | base = 10; |
| 49 | break; |
| 50 | case ios::hex: |
| 51 | base = 16; |
| 52 | break; |
| 53 | case ios::oct: |
| 54 | base = 8; |
| 55 | break; |
| 56 | default: |
| 57 | showbase = true; // look for initial "0" or "0x" or "0X" |
| 58 | if (c == '0') |
| 59 | { |
| 60 | if (! i.get(c)) |
| 61 | c = 0; // reset or we might loop indefinitely |
| 62 | |
| 63 | if (c == 'x' || c == 'X') |
| 64 | { |
| 65 | base = 16; |
| 66 | i.get(c); |
| 67 | } |
| 68 | else |
| 69 | { |
| 70 | base = 8; |
| 71 | zero = true; // if no other digit is read, the "0" counts |
| 72 | } |
| 73 | } |
| 74 | else |
| 75 | base = 10; |
| 76 | break; |
| 77 | } |
| 78 | |
| 79 | return base; |
| 80 | } |
| 81 | |
| 82 | void |
| 83 | __gmp_istream_set_digits (string &s, istream &i, char &c, bool &ok, int base) |
| 84 | { |
| 85 | switch (base) |
| 86 | { |
| 87 | case 10: |
| 88 | while (isdigit(c)) |
| 89 | { |
| 90 | ok = true; // at least a valid digit was read |
| 91 | s += c; |
| 92 | if (! i.get(c)) |
| 93 | break; |
| 94 | } |
| 95 | break; |
| 96 | case 8: |
| 97 | while (isdigit(c) && c != '8' && c != '9') |
| 98 | { |
| 99 | ok = true; // at least a valid digit was read |
| 100 | s += c; |
| 101 | if (! i.get(c)) |
| 102 | break; |
| 103 | } |
| 104 | break; |
| 105 | case 16: |
| 106 | while (isxdigit(c)) |
| 107 | { |
| 108 | ok = true; // at least a valid digit was read |
| 109 | s += c; |
| 110 | if (! i.get(c)) |
| 111 | break; |
| 112 | } |
| 113 | break; |
| 114 | } |
| 115 | } |