| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: mptext.c,v 1.1 1999/11/17 18:02:16 mdw Exp $ |
| 4 | * |
| 5 | * Textual representation of multiprecision numbers |
| 6 | * |
| 7 | * (c) 1999 Straylight/Edgeware |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 11 | * |
| 12 | * This file is part of Catacomb. |
| 13 | * |
| 14 | * Catacomb is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU Library General Public License as |
| 16 | * published by the Free Software Foundation; either version 2 of the |
| 17 | * License, or (at your option) any later version. |
| 18 | * |
| 19 | * Catacomb is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU Library General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU Library General Public |
| 25 | * License along with Catacomb; if not, write to the Free |
| 26 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 27 | * MA 02111-1307, USA. |
| 28 | */ |
| 29 | |
| 30 | /*----- Revision history --------------------------------------------------* |
| 31 | * |
| 32 | * $Log: mptext.c,v $ |
| 33 | * Revision 1.1 1999/11/17 18:02:16 mdw |
| 34 | * New multiprecision integer arithmetic suite. |
| 35 | * |
| 36 | */ |
| 37 | |
| 38 | /*----- Header files ------------------------------------------------------*/ |
| 39 | |
| 40 | #include <ctype.h> |
| 41 | #include <stdio.h> |
| 42 | |
| 43 | #include <mLib/darray.h> |
| 44 | |
| 45 | #include "mp.h" |
| 46 | #include "mptext.h" |
| 47 | |
| 48 | /*----- Data structures ---------------------------------------------------*/ |
| 49 | |
| 50 | #ifndef CHARV |
| 51 | DA_DECL(charv, char); |
| 52 | # define CHARV |
| 53 | #endif |
| 54 | |
| 55 | /*----- Main code ---------------------------------------------------------*/ |
| 56 | |
| 57 | /* --- @mp_read@ --- * |
| 58 | * |
| 59 | * Arguments: @mp *m@ = destination multiprecision number |
| 60 | * @int radix@ = base to assume for data (or zero to guess) |
| 61 | * @const mptext_ops *ops@ = pointer to operations block |
| 62 | * @void *p@ = data for the operations block |
| 63 | * |
| 64 | * Returns: The integer read, or zero if it didn't work. |
| 65 | * |
| 66 | * Use: Reads an integer from some source. If the @radix@ is |
| 67 | * specified, the number is assumed to be given in that radix, |
| 68 | * with the letters `a' (either upper- or lower-case) upwards |
| 69 | * standing for digits greater than 9. Otherwise, base 10 is |
| 70 | * assumed unless the number starts with `0' (octal), `0x' (hex) |
| 71 | * or `nnn_' (base `nnn'). An arbitrary amount of whitespace |
| 72 | * before the number is ignored. |
| 73 | */ |
| 74 | |
| 75 | mp *mp_read(mp *m, int radix, const mptext_ops *ops, void *p) |
| 76 | { |
| 77 | int r; |
| 78 | int ch; |
| 79 | unsigned f = 0; |
| 80 | |
| 81 | enum { |
| 82 | f_neg = 1u, |
| 83 | f_ok = 2u |
| 84 | }; |
| 85 | |
| 86 | /* --- Initialize the destination number --- */ |
| 87 | |
| 88 | MP_MODIFY(m, 16); |
| 89 | m->vl = m->v; |
| 90 | m->f &= ~MP_UNDEF; |
| 91 | |
| 92 | /* --- Read an initial character --- */ |
| 93 | |
| 94 | ch = ops->get(p); |
| 95 | while (isspace(ch)) |
| 96 | ch = ops->get(p); |
| 97 | |
| 98 | /* --- Handle an initial sign --- */ |
| 99 | |
| 100 | if (ch == '-') { |
| 101 | f |= f_neg; |
| 102 | ch = ops->get(p); |
| 103 | while (isspace(ch)) |
| 104 | ch = ops->get(p); |
| 105 | } |
| 106 | |
| 107 | /* --- If the radix is zero, look for leading zeros --- */ |
| 108 | |
| 109 | if (radix) |
| 110 | r = -1; |
| 111 | else if (ch != '0') { |
| 112 | radix = 10; |
| 113 | r = 0; |
| 114 | } else { |
| 115 | ch = ops->get(p); |
| 116 | if (ch == 'x') { |
| 117 | ch = ops->get(p); |
| 118 | radix = 16; |
| 119 | } else { |
| 120 | radix = 8; |
| 121 | f |= f_ok; |
| 122 | } |
| 123 | r = -1; |
| 124 | } |
| 125 | |
| 126 | /* --- Time to start --- */ |
| 127 | |
| 128 | for (;; ch = ops->get(p)) { |
| 129 | int x; |
| 130 | |
| 131 | /* --- An underscore indicates a numbered base --- */ |
| 132 | |
| 133 | if (ch == '_' && r > 0 && r <= 36) { |
| 134 | radix = r; |
| 135 | m->vl = m->v; |
| 136 | r = -1; |
| 137 | f &= ~f_ok; |
| 138 | continue; |
| 139 | } |
| 140 | |
| 141 | /* --- Check that the character is a digit and in range --- */ |
| 142 | |
| 143 | if (!isalnum(ch)) |
| 144 | break; |
| 145 | if (ch >= '0' && ch <= '9') |
| 146 | x = ch - '0'; |
| 147 | else { |
| 148 | ch = tolower(ch); |
| 149 | if (ch >= 'a' && ch <= 'z') /* ASCII dependent! */ |
| 150 | x = ch - 'a' + 10; |
| 151 | else |
| 152 | break; |
| 153 | } |
| 154 | |
| 155 | /* --- Sort out what to do with the character --- */ |
| 156 | |
| 157 | if (x >= 10 && r >= 0) |
| 158 | r = -1; |
| 159 | if (x >= radix) |
| 160 | break; |
| 161 | |
| 162 | if (r >= 0) |
| 163 | r = r * 10 + x; |
| 164 | |
| 165 | /* --- Stick the character on the end of my integer --- */ |
| 166 | |
| 167 | MP_ENSURE(m, MP_LEN(m) + 1); |
| 168 | MPX_UMULN(m->v, m->vl, m->v, m->vl - 1, radix); |
| 169 | MPX_UADDN(m->v, m->vl, x); |
| 170 | MP_SHRINK(m); |
| 171 | f |= f_ok; |
| 172 | } |
| 173 | |
| 174 | ops->unget(ch, p); |
| 175 | |
| 176 | /* --- Bail out if the number was bad --- */ |
| 177 | |
| 178 | if (!(f & f_ok)) { |
| 179 | MP_DROP(m); |
| 180 | return (0); |
| 181 | } |
| 182 | |
| 183 | /* --- Set the sign and return --- */ |
| 184 | |
| 185 | m->f = 0; |
| 186 | if (f & f_neg) |
| 187 | m->f |= MP_NEG; |
| 188 | return (m); |
| 189 | } |
| 190 | |
| 191 | /* --- @mp_write@ --- * |
| 192 | * |
| 193 | * Arguments: @mp *m@ = pointer to a multi-precision integer |
| 194 | * @int radix@ = radix to use when writing the number out |
| 195 | * @const mptext_ops *ops@ = pointer to an operations block |
| 196 | * @void *p@ = data for the operations block |
| 197 | * |
| 198 | * Returns: Zero if it worked, nonzero otherwise. |
| 199 | * |
| 200 | * Use: Writes a large integer in textual form. |
| 201 | */ |
| 202 | |
| 203 | int mp_write(mp *m, int radix, const mptext_ops *ops, void *p) |
| 204 | { |
| 205 | charv v = DA_INIT; |
| 206 | mpw b = radix; |
| 207 | mp bb; |
| 208 | |
| 209 | /* --- Set various things up --- */ |
| 210 | |
| 211 | m = MP_COPY(m); |
| 212 | mp_build(&bb, &b, &b + 1); |
| 213 | |
| 214 | /* --- If the number is negative, sort that out --- */ |
| 215 | |
| 216 | if (m->f & MP_NEG) { |
| 217 | if (ops->put("-", 1, p)) |
| 218 | return (EOF); |
| 219 | MP_SPLIT(m); |
| 220 | m->f &= ~MP_NEG; |
| 221 | } |
| 222 | |
| 223 | /* --- Write digits to a temporary array --- */ |
| 224 | |
| 225 | do { |
| 226 | mp *q = MP_NEW, *r = MP_NEW; |
| 227 | int ch; |
| 228 | mpw x; |
| 229 | |
| 230 | mp_div(&q, &r, m, &bb); |
| 231 | x = r->v[0]; |
| 232 | if (x < 10) |
| 233 | ch = '0' + x; |
| 234 | else |
| 235 | ch = 'a' + x - 10; |
| 236 | DA_UNSHIFT(&v, ch); |
| 237 | MP_DROP(m); |
| 238 | MP_DROP(r); |
| 239 | m = q; |
| 240 | } while (MP_CMP(m, !=, MP_ZERO)); |
| 241 | |
| 242 | /* --- Finished that --- */ |
| 243 | |
| 244 | MP_DROP(m); |
| 245 | |
| 246 | { |
| 247 | int rc = ops->put(DA(&v), DA_LEN(&v), p); |
| 248 | DA_DESTROY(&v); |
| 249 | return (rc ? EOF : 0); |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | /*----- Test rig ----------------------------------------------------------*/ |
| 254 | |
| 255 | #ifdef TEST_RIG |
| 256 | |
| 257 | #include <mLib/testrig.h> |
| 258 | |
| 259 | static int verify(dstr *v) |
| 260 | { |
| 261 | int ok = 1; |
| 262 | int ib = *(int *)v[0].buf, ob = *(int *)v[2].buf; |
| 263 | dstr d = DSTR_INIT; |
| 264 | mp *m = mp_readdstr(MP_NEW, &v[1], 0, ib); |
| 265 | if (m) { |
| 266 | if (!ob) { |
| 267 | fprintf(stderr, "*** unexpected successful parse\n" |
| 268 | "*** input [%i] = %s\n", |
| 269 | ib, v[1].buf); |
| 270 | mp_writedstr(m, &d, 10); |
| 271 | fprintf(stderr, "*** (value = %s)\n", d.buf); |
| 272 | ok = 0; |
| 273 | } else { |
| 274 | mp_writedstr(m, &d, ob); |
| 275 | if (d.len != v[3].len || memcmp(d.buf, v[3].buf, d.len) != 0) { |
| 276 | fprintf(stderr, "*** failed read or write\n" |
| 277 | "*** input [%i] = %s\n" |
| 278 | "*** output [%i] = %s\n" |
| 279 | "*** expected [%i] = %s\n", |
| 280 | ib, v[1].buf, ob, d.buf, ob, v[3].buf); |
| 281 | ok = 0; |
| 282 | } |
| 283 | } |
| 284 | mp_drop(m); |
| 285 | } else { |
| 286 | if (ob) { |
| 287 | fprintf(stderr, "*** unexpected parse failure\n" |
| 288 | "*** input [%i] = %s\n" |
| 289 | "*** expected [%i] = %s\n", |
| 290 | ib, v[1].buf, ob, v[3].buf); |
| 291 | ok = 0; |
| 292 | } |
| 293 | } |
| 294 | |
| 295 | dstr_destroy(&d); |
| 296 | return (ok); |
| 297 | } |
| 298 | |
| 299 | static test_chunk tests[] = { |
| 300 | { "mptext", verify, |
| 301 | { &type_int, &type_string, &type_int, &type_string, 0 } }, |
| 302 | { 0, 0, { 0 } } |
| 303 | }; |
| 304 | |
| 305 | int main(int argc, char *argv[]) |
| 306 | { |
| 307 | sub_init(); |
| 308 | test_run(argc, argv, tests, SRCDIR "/tests/mptext"); |
| 309 | return (0); |
| 310 | } |
| 311 | |
| 312 | #endif |
| 313 | |
| 314 | /*----- That's all, folks -------------------------------------------------*/ |