Mercurial > cpython-lru_cache-weakref
annotate Objects/floatobject.c @ 3044:7e7bb00a0a2e legacy-trunk
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| author | Jack Jansen <jack.jansen@cwi.nl> |
|---|---|
| date | Thu, 31 Aug 1995 13:47:14 +0000 |
| parents | 6cbd2830b5a2 |
| children | 67d347c32fff |
| rev | line source |
|---|---|
| 145 | 1 /*********************************************************** |
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
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3 The Netherlands. |
| 145 | 4 |
| 5 All Rights Reserved | |
| 6 | |
| 7 Permission to use, copy, modify, and distribute this software and its | |
| 8 documentation for any purpose and without fee is hereby granted, | |
| 9 provided that the above copyright notice appear in all copies and that | |
| 10 both that copyright notice and this permission notice appear in | |
| 11 supporting documentation, and that the names of Stichting Mathematisch | |
| 12 Centrum or CWI not be used in advertising or publicity pertaining to | |
| 13 distribution of the software without specific, written prior permission. | |
| 14 | |
| 15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO | |
| 16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND | |
| 17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE | |
| 18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
| 19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
| 20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT | |
| 21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
| 22 | |
| 23 ******************************************************************/ | |
| 24 | |
| 6 | 25 /* Float object implementation */ |
| 26 | |
| 27 | 27 /* XXX There should be overflow checks here, but it's hard to check |
| 28 for any kind of float exception without losing portability. */ | |
| 29 | |
| 86 | 30 #include "allobjects.h" |
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31 #include "modsupport.h" |
| 6 | 32 |
| 91 | 33 #include <errno.h> |
| 86 | 34 #include <ctype.h> |
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35 #include "mymath.h" |
| 6 | 36 |
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37 #ifdef i860 |
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38 /* Cray APP has bogus definition of HUGE_VAL in <math.h> */ |
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39 #undef HUGE_VAL |
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40 #endif |
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41 |
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42 #ifdef HUGE_VAL |
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43 #define CHECK(x) if (errno != 0) ; \ |
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44 else if (-HUGE_VAL <= (x) && (x) <= HUGE_VAL) ; \ |
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45 else errno = ERANGE |
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46 #else |
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47 #define CHECK(x) /* Don't know how to check */ |
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48 #endif |
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49 |
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50 #ifdef HAVE_LIMITS_H |
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51 #include <limits.h> |
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52 #endif |
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53 |
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54 #ifndef LONG_MAX |
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55 #define LONG_MAX 0X7FFFFFFFL |
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56 #endif |
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57 |
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58 #ifndef LONG_MIN |
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59 #define LONG_MIN (-LONG_MAX-1) |
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60 #endif |
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61 |
| 2327 | 62 #ifdef __NeXT__ |
| 63 #ifdef __sparc__ | |
| 64 /* | |
| 65 * This works around a bug in the NS/Sparc 3.3 pre-release | |
| 66 * limits.h header file. | |
| 67 * 10-Feb-1995 bwarsaw@cnri.reston.va.us | |
| 68 */ | |
| 69 #undef LONG_MIN | |
| 70 #define LONG_MIN (-LONG_MAX-1) | |
| 71 #endif | |
| 72 #endif | |
| 73 | |
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74 #if !defined(__STDC__) && !defined(macintosh) |
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75 extern double fmod PROTO((double, double)); |
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76 extern double pow PROTO((double, double)); |
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77 #endif |
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78 |
| 6 | 79 object * |
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80 #ifdef __SC__ |
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81 newfloatobject(double fval) |
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82 #else |
| 6 | 83 newfloatobject(fval) |
| 84 double fval; | |
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85 #endif |
| 6 | 86 { |
| 87 /* For efficiency, this code is copied from newobject() */ | |
| 88 register floatobject *op = (floatobject *) malloc(sizeof(floatobject)); | |
| 27 | 89 if (op == NULL) |
| 90 return err_nomem(); | |
| 91 op->ob_type = &Floattype; | |
| 92 op->ob_fval = fval; | |
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93 NEWREF(op); |
| 6 | 94 return (object *) op; |
| 95 } | |
| 96 | |
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97 static void |
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98 float_dealloc(op) |
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99 object *op; |
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100 { |
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101 DEL(op); |
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102 } |
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103 |
| 6 | 104 double |
| 105 getfloatvalue(op) | |
| 106 object *op; | |
| 107 { | |
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108 number_methods *nb; |
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109 floatobject *fo; |
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110 double val; |
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111 |
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112 if (op && is_floatobject(op)) |
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113 return GETFLOATVALUE((floatobject*) op); |
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114 |
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115 if (op == NULL || (nb = op->ob_type->tp_as_number) == NULL || |
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116 nb->nb_float == NULL) { |
| 27 | 117 err_badarg(); |
| 6 | 118 return -1; |
| 119 } | |
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120 |
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121 fo = (floatobject*) (*nb->nb_float) (op); |
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122 if (fo == NULL) |
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123 return -1; |
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124 if (!is_floatobject(fo)) { |
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125 err_setstr(TypeError, "nb_float should return float object"); |
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126 return -1; |
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127 } |
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128 |
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129 val = GETFLOATVALUE(fo); |
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130 DECREF(fo); |
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131 |
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132 return val; |
| 6 | 133 } |
| 134 | |
| 135 /* Methods */ | |
| 136 | |
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137 void |
| 6 | 138 float_buf_repr(buf, v) |
| 139 char *buf; | |
| 140 floatobject *v; | |
| 141 { | |
| 142 register char *cp; | |
| 143 /* Subroutine for float_repr and float_print. | |
| 144 We want float numbers to be recognizable as such, | |
| 145 i.e., they should contain a decimal point or an exponent. | |
| 146 However, %g may print the number as an integer; | |
| 147 in such cases, we append ".0" to the string. */ | |
| 148 sprintf(buf, "%.12g", v->ob_fval); | |
| 149 cp = buf; | |
| 150 if (*cp == '-') | |
| 151 cp++; | |
| 152 for (; *cp != '\0'; cp++) { | |
| 153 /* Any non-digit means it's not an integer; | |
| 154 this takes care of NAN and INF as well. */ | |
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155 if (!isdigit(Py_CHARMASK(*cp))) |
| 6 | 156 break; |
| 157 } | |
| 158 if (*cp == '\0') { | |
| 159 *cp++ = '.'; | |
| 160 *cp++ = '0'; | |
| 161 *cp++ = '\0'; | |
| 162 } | |
| 163 } | |
| 164 | |
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165 /* ARGSUSED */ |
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166 static int |
| 6 | 167 float_print(v, fp, flags) |
| 168 floatobject *v; | |
| 169 FILE *fp; | |
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170 int flags; /* Not used but required by interface */ |
| 6 | 171 { |
| 172 char buf[100]; | |
| 173 float_buf_repr(buf, v); | |
| 174 fputs(buf, fp); | |
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175 return 0; |
| 6 | 176 } |
| 177 | |
| 178 static object * | |
| 179 float_repr(v) | |
| 180 floatobject *v; | |
| 181 { | |
| 182 char buf[100]; | |
| 183 float_buf_repr(buf, v); | |
| 184 return newstringobject(buf); | |
| 185 } | |
| 186 | |
| 187 static int | |
| 188 float_compare(v, w) | |
| 189 floatobject *v, *w; | |
| 190 { | |
| 191 double i = v->ob_fval; | |
| 192 double j = w->ob_fval; | |
| 193 return (i < j) ? -1 : (i > j) ? 1 : 0; | |
| 194 } | |
| 195 | |
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196 static long |
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197 float_hash(v) |
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198 floatobject *v; |
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199 { |
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200 double intpart, fractpart; |
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201 int expo; |
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202 long x; |
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203 /* This is designed so that Python numbers with the same |
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204 value hash to the same value, otherwise comparisons |
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205 of mapping keys will turn out weird */ |
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206 |
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207 #ifdef MPW /* MPW C modf expects pointer to extended as second argument */ |
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208 { |
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209 extended e; |
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210 fractpart = modf(v->ob_fval, &e); |
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211 intpart = e; |
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212 } |
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213 #else |
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214 fractpart = modf(v->ob_fval, &intpart); |
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215 #endif |
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216 |
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217 if (fractpart == 0.0) { |
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218 if (intpart > 0x7fffffffL || -intpart > 0x7fffffffL) { |
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219 /* Convert to long int and use its hash... */ |
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220 object *w = dnewlongobject(v->ob_fval); |
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221 if (w == NULL) |
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222 return -1; |
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223 x = hashobject(w); |
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224 DECREF(w); |
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225 return x; |
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226 } |
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227 x = (long)intpart; |
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228 } |
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229 else { |
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230 fractpart = frexp(fractpart, &expo); |
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231 fractpart = fractpart*2147483648.0; /* 2**31 */ |
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232 x = (long) (intpart + fractpart) ^ expo; /* Rather arbitrary */ |
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233 } |
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234 if (x == -1) |
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235 x = -2; |
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236 return x; |
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237 } |
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238 |
| 6 | 239 static object * |
| 240 float_add(v, w) | |
| 241 floatobject *v; | |
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242 floatobject *w; |
| 6 | 243 { |
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244 return newfloatobject(v->ob_fval + w->ob_fval); |
| 6 | 245 } |
| 246 | |
| 247 static object * | |
| 248 float_sub(v, w) | |
| 249 floatobject *v; | |
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250 floatobject *w; |
| 6 | 251 { |
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252 return newfloatobject(v->ob_fval - w->ob_fval); |
| 6 | 253 } |
| 254 | |
| 255 static object * | |
| 256 float_mul(v, w) | |
| 257 floatobject *v; | |
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258 floatobject *w; |
| 6 | 259 { |
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260 return newfloatobject(v->ob_fval * w->ob_fval); |
| 6 | 261 } |
| 262 | |
| 263 static object * | |
| 264 float_div(v, w) | |
| 265 floatobject *v; | |
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266 floatobject *w; |
| 6 | 267 { |
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268 if (w->ob_fval == 0) { |
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269 err_setstr(ZeroDivisionError, "float division"); |
| 6 | 270 return NULL; |
| 271 } | |
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272 return newfloatobject(v->ob_fval / w->ob_fval); |
| 6 | 273 } |
| 274 | |
| 275 static object * | |
| 276 float_rem(v, w) | |
| 277 floatobject *v; | |
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278 floatobject *w; |
| 6 | 279 { |
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280 double vx, wx; |
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281 double /* div, */ mod; |
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282 wx = w->ob_fval; |
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283 if (wx == 0.0) { |
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284 err_setstr(ZeroDivisionError, "float modulo"); |
| 6 | 285 return NULL; |
| 286 } | |
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287 vx = v->ob_fval; |
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288 mod = fmod(vx, wx); |
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289 /* div = (vx - mod) / wx; */ |
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290 if (wx*mod < 0) { |
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291 mod += wx; |
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292 /* div -= 1.0; */ |
| 6 | 293 } |
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294 return newfloatobject(mod); |
| 6 | 295 } |
| 296 | |
| 297 static object * | |
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298 float_divmod(v, w) |
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299 floatobject *v; |
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300 floatobject *w; |
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301 { |
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302 double vx, wx; |
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303 double div, mod; |
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304 wx = w->ob_fval; |
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305 if (wx == 0.0) { |
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306 err_setstr(ZeroDivisionError, "float divmod()"); |
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307 return NULL; |
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308 } |
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309 vx = v->ob_fval; |
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310 mod = fmod(vx, wx); |
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311 div = (vx - mod) / wx; |
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312 if (wx*mod < 0) { |
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313 mod += wx; |
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314 div -= 1.0; |
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315 } |
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316 return mkvalue("(dd)", div, mod); |
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317 } |
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318 |
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319 static object * |
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320 float_pow(v, w, z) |
| 6 | 321 floatobject *v; |
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322 floatobject *w; |
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323 floatobject *z; |
| 6 | 324 { |
| 325 double iv, iw, ix; | |
| 326 iv = v->ob_fval; | |
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327 iw = w->ob_fval; |
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328 /* XXX Doesn't handle overflows if z!=None yet; it may never do so :( |
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329 * The z parameter is really only going to be useful for integers and |
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330 * long integers. Maybe something clever with logarithms could be done. |
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331 * [AMK] |
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332 */ |
|
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333 /* Sort out special cases here instead of relying on pow() */ |
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334 if (iw == 0.0) { /* x**0 is 1, even 0**0 */ |
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335 if ((object *)z!=None) { |
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336 ix=fmod(1.0, z->ob_fval); |
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337 if (ix!=0 && z->ob_fval<0) ix+=z->ob_fval; |
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338 } |
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339 else ix=1.0; |
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340 return newfloatobject(ix); |
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341 } |
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342 if (iv == 0.0) { |
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343 if (iw < 0.0) { |
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344 err_setstr(ValueError, "0.0 to a negative power"); |
|
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345 return NULL; |
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346 } |
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347 return newfloatobject(0.0); |
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348 } |
| 6 | 349 errno = 0; |
| 350 ix = pow(iv, iw); | |
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351 CHECK(ix); |
| 27 | 352 if (errno != 0) { |
| 353 /* XXX could it be another type of error? */ | |
| 354 err_errno(OverflowError); | |
| 6 | 355 return NULL; |
| 27 | 356 } |
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357 if ((object *)z!=None) { |
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358 ix=fmod(ix, z->ob_fval); /* XXX To Be Rewritten */ |
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359 if ( ix!=0 && |
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360 ((iv<0 && z->ob_fval>0) || (iv>0 && z->ob_fval<0) )) { |
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361 ix+=z->ob_fval; |
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362 } |
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363 } |
| 27 | 364 return newfloatobject(ix); |
| 6 | 365 } |
| 366 | |
| 367 static object * | |
| 368 float_neg(v) | |
| 369 floatobject *v; | |
| 370 { | |
| 371 return newfloatobject(-v->ob_fval); | |
| 372 } | |
| 373 | |
| 374 static object * | |
| 375 float_pos(v) | |
| 376 floatobject *v; | |
| 377 { | |
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378 INCREF(v); |
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379 return (object *)v; |
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380 } |
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381 |
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382 static object * |
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383 float_abs(v) |
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384 floatobject *v; |
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385 { |
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386 if (v->ob_fval < 0) |
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387 return float_neg(v); |
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388 else |
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389 return float_pos(v); |
| 6 | 390 } |
| 391 | |
| 239 | 392 static int |
| 393 float_nonzero(v) | |
| 394 floatobject *v; | |
| 395 { | |
| 396 return v->ob_fval != 0.0; | |
| 397 } | |
| 398 | |
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399 static int |
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400 float_coerce(pv, pw) |
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401 object **pv; |
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402 object **pw; |
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403 { |
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404 if (is_intobject(*pw)) { |
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405 long x = getintvalue(*pw); |
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406 *pw = newfloatobject((double)x); |
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407 INCREF(*pv); |
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408 return 0; |
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409 } |
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410 else if (is_longobject(*pw)) { |
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411 *pw = newfloatobject(dgetlongvalue(*pw)); |
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412 INCREF(*pv); |
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413 return 0; |
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414 } |
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415 return 1; /* Can't do it */ |
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416 } |
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417 |
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418 static object * |
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419 float_int(v) |
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420 object *v; |
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421 { |
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422 double x = getfloatvalue(v); |
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423 if (x < 0 ? (x = ceil(x)) < (double)LONG_MIN |
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424 : (x = floor(x)) > (double)LONG_MAX) { |
| 2327 | 425 err_setstr(OverflowError, "float too large to convert"); |
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426 return NULL; |
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427 } |
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428 return newintobject((long)x); |
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429 } |
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430 |
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431 static object * |
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432 float_long(v) |
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433 object *v; |
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434 { |
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435 double x = getfloatvalue(v); |
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436 return dnewlongobject(x); |
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437 } |
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438 |
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439 static object * |
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440 float_float(v) |
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441 object *v; |
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442 { |
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443 INCREF(v); |
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444 return v; |
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445 } |
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446 |
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447 |
| 6 | 448 static number_methods float_as_number = { |
|
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449 (binaryfunc)float_add, /*nb_add*/ |
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450 (binaryfunc)float_sub, /*nb_subtract*/ |
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451 (binaryfunc)float_mul, /*nb_multiply*/ |
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452 (binaryfunc)float_div, /*nb_divide*/ |
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453 (binaryfunc)float_rem, /*nb_remainder*/ |
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454 (binaryfunc)float_divmod, /*nb_divmod*/ |
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455 (ternaryfunc)float_pow, /*nb_power*/ |
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456 (unaryfunc)float_neg, /*nb_negative*/ |
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457 (unaryfunc)float_pos, /*nb_positive*/ |
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458 (unaryfunc)float_abs, /*nb_absolute*/ |
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459 (inquiry)float_nonzero, /*nb_nonzero*/ |
|
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460 0, /*nb_invert*/ |
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461 0, /*nb_lshift*/ |
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462 0, /*nb_rshift*/ |
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463 0, /*nb_and*/ |
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464 0, /*nb_xor*/ |
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465 0, /*nb_or*/ |
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466 (coercion)float_coerce, /*nb_coerce*/ |
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467 (unaryfunc)float_int, /*nb_int*/ |
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468 (unaryfunc)float_long, /*nb_long*/ |
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469 (unaryfunc)float_float, /*nb_float*/ |
|
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470 0, /*nb_oct*/ |
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471 0, /*nb_hex*/ |
| 6 | 472 }; |
| 473 | |
| 474 typeobject Floattype = { | |
| 475 OB_HEAD_INIT(&Typetype) | |
| 476 0, | |
| 477 "float", | |
| 478 sizeof(floatobject), | |
| 479 0, | |
|
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480 (destructor)float_dealloc, /*tp_dealloc*/ |
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481 (printfunc)float_print, /*tp_print*/ |
| 6 | 482 0, /*tp_getattr*/ |
| 483 0, /*tp_setattr*/ | |
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484 (cmpfunc)float_compare, /*tp_compare*/ |
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485 (reprfunc)float_repr, /*tp_repr*/ |
| 6 | 486 &float_as_number, /*tp_as_number*/ |
| 487 0, /*tp_as_sequence*/ | |
| 488 0, /*tp_as_mapping*/ | |
|
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489 (hashfunc)float_hash, /*tp_hash*/ |
| 6 | 490 }; |
