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.h" 35 #include "gmp-impl.h" 36 37 using namespace std; 38 39 40 int 41 __gmp_istream_set_base (istream &i, char &c, bool &zero, bool &showbase) 42 { 43 int base; 44 45 zero = showbase = false; 46 switch (i.flags() & ios::basefield) 47 { 48 case ios::dec: 49 base = 10; 50 break; 51 case ios::hex: 52 base = 16; 53 break; 54 case ios::oct: 55 base = 8; 56 break; 57 default: 58 showbase = true; // look for initial "0" or "0x" or "0X" 59 if (c == '0') 60 { 61 if (! i.get(c)) 62 c = 0; // reset or we might loop indefinitely 63 64 if (c == 'x' || c == 'X') 65 { 66 base = 16; 67 i.get(c); 68 } 69 else 70 { 71 base = 8; 72 zero = true; // if no other digit is read, the "0" counts 73 } 74 } 75 else 76 base = 10; 77 break; 78 } 79 80 return base; 81 } 82 83 void 84 __gmp_istream_set_digits (string &s, istream &i, char &c, bool &ok, int base) 85 { 86 switch (base) 87 { 88 case 10: 89 while (isdigit(c)) 90 { 91 ok = true; // at least a valid digit was read 92 s += c; 93 if (! i.get(c)) 94 break; 95 } 96 break; 97 case 8: 98 while (isdigit(c) && c != '8' && c != '9') 99 { 100 ok = true; // at least a valid digit was read 101 s += c; 102 if (! i.get(c)) 103 break; 104 } 105 break; 106 case 16: 107 while (isxdigit(c)) 108 { 109 ok = true; // at least a valid digit was read 110 s += c; 111 if (! i.get(c)) 112 break; 113 } 114 break; 115 } 116 } 117