blob: 278bf25025d64e1b6375e1b2a57ab5e2b3306246 [file] [log] [blame]
Rich Felker415c4cd2012-04-10 11:52:55 -04001#include <stdint.h>
2#include <stdio.h>
3#include <math.h>
4#include <float.h>
5#include <limits.h>
Rich Felkerc5ff2962012-04-10 22:38:21 -04006#include <errno.h>
Rich Felker835f9f92012-11-08 16:39:41 -05007#include <ctype.h>
Rich Felker415c4cd2012-04-10 11:52:55 -04008
Rich Felker21625412012-04-10 21:47:37 -04009#include "shgetc.h"
Rich Felker415c4cd2012-04-10 11:52:55 -040010#include "floatscan.h"
11
12#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
13
14#define LD_B1B_DIG 2
15#define LD_B1B_MAX 9007199, 254740991
16#define KMAX 128
17
Szabolcs Nagyf3f29792015-02-09 21:38:02 +010018#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
Rich Felker415c4cd2012-04-10 11:52:55 -040019
20#define LD_B1B_DIG 3
21#define LD_B1B_MAX 18, 446744073, 709551615
22#define KMAX 2048
23
Szabolcs Nagyf3f29792015-02-09 21:38:02 +010024#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
25
26#define LD_B1B_DIG 4
27#define LD_B1B_MAX 10384593, 717069655, 257060992, 658440191
28#define KMAX 2048
29
30#else
31#error Unsupported long double representation
Rich Felker415c4cd2012-04-10 11:52:55 -040032#endif
33
34#define MASK (KMAX-1)
35
Rich Felker77731d02012-04-21 14:14:10 -040036#define CONCAT2(x,y) x ## y
37#define CONCAT(x,y) CONCAT2(x,y)
Rich Felker415c4cd2012-04-10 11:52:55 -040038
Rich Felker21625412012-04-10 21:47:37 -040039static long long scanexp(FILE *f, int pok)
Rich Felker415c4cd2012-04-10 11:52:55 -040040{
41 int c;
42 int x;
43 long long y;
44 int neg = 0;
45
Rich Felker21625412012-04-10 21:47:37 -040046 c = shgetc(f);
Rich Felker415c4cd2012-04-10 11:52:55 -040047 if (c=='+' || c=='-') {
48 neg = (c=='-');
Rich Felker21625412012-04-10 21:47:37 -040049 c = shgetc(f);
50 if (c-'0'>=10U && pok) shunget(f);
Rich Felker415c4cd2012-04-10 11:52:55 -040051 }
Rich Felker21625412012-04-10 21:47:37 -040052 if (c-'0'>=10U) {
53 shunget(f);
54 return LLONG_MIN;
55 }
56 for (x=0; c-'0'<10U && x<INT_MAX/10; c = shgetc(f))
Rich Felker415c4cd2012-04-10 11:52:55 -040057 x = 10*x + c-'0';
Rich Felker1ff3e6f2012-04-18 03:53:53 -040058 for (y=x; c-'0'<10U && y<LLONG_MAX/100; c = shgetc(f))
Rich Felker415c4cd2012-04-10 11:52:55 -040059 y = 10*y + c-'0';
Rich Felker21625412012-04-10 21:47:37 -040060 for (; c-'0'<10U; c = shgetc(f));
61 shunget(f);
Rich Felker415c4cd2012-04-10 11:52:55 -040062 return neg ? -y : y;
63}
64
65
Rich Felker48bb81a2012-04-11 00:18:57 -040066static long double decfloat(FILE *f, int c, int bits, int emin, int sign, int pok)
Rich Felker415c4cd2012-04-10 11:52:55 -040067{
68 uint32_t x[KMAX];
69 static const uint32_t th[] = { LD_B1B_MAX };
70 int i, j, k, a, z;
Rich Felker2df2a972012-04-21 13:50:23 -040071 long long lrp=0, dc=0;
Rich Felker21625412012-04-10 21:47:37 -040072 long long e10=0;
Rich Felkerfe514952012-04-12 00:16:01 -040073 int lnz = 0;
Rich Felker2df2a972012-04-21 13:50:23 -040074 int gotdig = 0, gotrad = 0;
Rich Felker415c4cd2012-04-10 11:52:55 -040075 int rp;
Rich Felker415c4cd2012-04-10 11:52:55 -040076 int e2;
Rich Felker77731d02012-04-21 14:14:10 -040077 int emax = -emin-bits+3;
78 int denormal = 0;
Rich Felker415c4cd2012-04-10 11:52:55 -040079 long double y;
80 long double frac=0;
81 long double bias=0;
Rich Felkerfe514952012-04-12 00:16:01 -040082 static const int p10s[] = { 10, 100, 1000, 10000,
83 100000, 1000000, 10000000, 100000000 };
Rich Felker415c4cd2012-04-10 11:52:55 -040084
85 j=0;
86 k=0;
87
Rich Felker415c4cd2012-04-10 11:52:55 -040088 /* Don't let leading zeros consume buffer space */
Rich Felker21625412012-04-10 21:47:37 -040089 for (; c=='0'; c = shgetc(f)) gotdig=1;
Rich Felker2df2a972012-04-21 13:50:23 -040090 if (c=='.') {
91 gotrad = 1;
92 for (c = shgetc(f); c=='0'; c = shgetc(f)) gotdig=1, lrp--;
93 }
Rich Felker415c4cd2012-04-10 11:52:55 -040094
95 x[0] = 0;
Rich Felker21625412012-04-10 21:47:37 -040096 for (; c-'0'<10U || c=='.'; c = shgetc(f)) {
Rich Felker415c4cd2012-04-10 11:52:55 -040097 if (c == '.') {
Rich Felker2df2a972012-04-21 13:50:23 -040098 if (gotrad) break;
99 gotrad = 1;
Rich Felker415c4cd2012-04-10 11:52:55 -0400100 lrp = dc;
Rich Felker02eb5682012-04-22 14:05:12 -0400101 } else if (k < KMAX-3) {
Rich Felker415c4cd2012-04-10 11:52:55 -0400102 dc++;
Rich Felker2ac580f2012-04-16 01:53:52 -0400103 if (c!='0') lnz = dc;
Rich Felker415c4cd2012-04-10 11:52:55 -0400104 if (j) x[k] = x[k]*10 + c-'0';
105 else x[k] = c-'0';
106 if (++j==9) {
107 k++;
108 j=0;
109 }
110 gotdig=1;
111 } else {
112 dc++;
Szabolcs Nagy6ffdc452016-09-04 04:51:03 +0200113 if (c!='0') {
Rich Felkere3142582016-10-20 14:40:59 -0400114 lnz = (KMAX-4)*9;
Szabolcs Nagy6ffdc452016-09-04 04:51:03 +0200115 x[KMAX-4] |= 1;
116 }
Rich Felker415c4cd2012-04-10 11:52:55 -0400117 }
118 }
Rich Felker2df2a972012-04-21 13:50:23 -0400119 if (!gotrad) lrp=dc;
Rich Felker415c4cd2012-04-10 11:52:55 -0400120
121 if (gotdig && (c|32)=='e') {
Rich Felker21625412012-04-10 21:47:37 -0400122 e10 = scanexp(f, pok);
Rich Felker415c4cd2012-04-10 11:52:55 -0400123 if (e10 == LLONG_MIN) {
Rich Felker21625412012-04-10 21:47:37 -0400124 if (pok) {
125 shunget(f);
126 } else {
127 shlim(f, 0);
Rich Felker415c4cd2012-04-10 11:52:55 -0400128 return 0;
129 }
130 e10 = 0;
131 }
132 lrp += e10;
133 } else if (c>=0) {
Rich Felker21625412012-04-10 21:47:37 -0400134 shunget(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400135 }
136 if (!gotdig) {
Rich Felkerc5ff2962012-04-10 22:38:21 -0400137 errno = EINVAL;
Rich Felker21625412012-04-10 21:47:37 -0400138 shlim(f, 0);
Rich Felker415c4cd2012-04-10 11:52:55 -0400139 return 0;
140 }
141
Rich Felkerfe514952012-04-12 00:16:01 -0400142 /* Handle zero specially to avoid nasty special cases later */
143 if (!x[0]) return sign * 0.0;
144
145 /* Optimize small integers (w/no exponent) and over/under-flow */
146 if (lrp==dc && dc<10 && (bits>30 || x[0]>>bits==0))
Rich Felker415c4cd2012-04-10 11:52:55 -0400147 return sign * (long double)x[0];
Rich Felkerc5ff2962012-04-10 22:38:21 -0400148 if (lrp > -emin/2) {
149 errno = ERANGE;
Rich Felker415c4cd2012-04-10 11:52:55 -0400150 return sign * LDBL_MAX * LDBL_MAX;
Rich Felkerc5ff2962012-04-10 22:38:21 -0400151 }
152 if (lrp < emin-2*LDBL_MANT_DIG) {
153 errno = ERANGE;
Rich Felker415c4cd2012-04-10 11:52:55 -0400154 return sign * LDBL_MIN * LDBL_MIN;
Rich Felkerc5ff2962012-04-10 22:38:21 -0400155 }
Rich Felker415c4cd2012-04-10 11:52:55 -0400156
Rich Felkerfe514952012-04-12 00:16:01 -0400157 /* Align incomplete final B1B digit */
Rich Felker02eb5682012-04-22 14:05:12 -0400158 if (j) {
Rich Felker415c4cd2012-04-10 11:52:55 -0400159 for (; j<9; j++) x[k]*=10;
160 k++;
161 j=0;
162 }
163
164 a = 0;
165 z = k;
166 e2 = 0;
167 rp = lrp;
168
Rich Felkerfe514952012-04-12 00:16:01 -0400169 /* Optimize small to mid-size integers (even in exp. notation) */
170 if (lnz<9 && lnz<=rp && rp < 18) {
171 if (rp == 9) return sign * (long double)x[0];
172 if (rp < 9) return sign * (long double)x[0] / p10s[8-rp];
173 int bitlim = bits-3*(int)(rp-9);
174 if (bitlim>30 || x[0]>>bitlim==0)
175 return sign * (long double)x[0] * p10s[rp-10];
176 }
177
Szabolcs Nagyd184a092016-09-04 04:46:00 +0200178 /* Drop trailing zeros */
179 for (; !x[z-1]; z--);
180
Rich Felkerfe514952012-04-12 00:16:01 -0400181 /* Align radix point to B1B digit boundary */
Rich Felker1bdd5c82012-04-11 14:11:47 -0400182 if (rp % 9) {
Rich Felker1bdd5c82012-04-11 14:11:47 -0400183 int rpm9 = rp>=0 ? rp%9 : rp%9+9;
Rich Felkerfe514952012-04-12 00:16:01 -0400184 int p10 = p10s[8-rpm9];
Rich Felker1bdd5c82012-04-11 14:11:47 -0400185 uint32_t carry = 0;
Rich Felker5837a0b2012-04-11 14:20:45 -0400186 for (k=a; k!=z; k++) {
Rich Felker1bdd5c82012-04-11 14:11:47 -0400187 uint32_t tmp = x[k] % p10;
188 x[k] = x[k]/p10 + carry;
189 carry = 1000000000/p10 * tmp;
190 if (k==a && !x[k]) {
191 a = (a+1 & MASK);
192 rp -= 9;
193 }
194 }
Rich Felker5837a0b2012-04-11 14:20:45 -0400195 if (carry) x[z++] = carry;
Rich Felker1bdd5c82012-04-11 14:11:47 -0400196 rp += 9-rpm9;
197 }
198
Rich Felkerfe514952012-04-12 00:16:01 -0400199 /* Upscale until desired number of bits are left of radix point */
Rich Felker96acdae2012-04-11 21:29:12 -0400200 while (rp < 9*LD_B1B_DIG || (rp == 9*LD_B1B_DIG && x[a]<th[0])) {
Rich Felker415c4cd2012-04-10 11:52:55 -0400201 uint32_t carry = 0;
202 e2 -= 29;
203 for (k=(z-1 & MASK); ; k=(k-1 & MASK)) {
204 uint64_t tmp = ((uint64_t)x[k] << 29) + carry;
205 if (tmp > 1000000000) {
206 carry = tmp / 1000000000;
207 x[k] = tmp % 1000000000;
208 } else {
209 carry = 0;
210 x[k] = tmp;
211 }
212 if (k==(z-1 & MASK) && k!=a && !x[k]) z = k;
213 if (k==a) break;
214 }
215 if (carry) {
216 rp += 9;
Rich Felker11458e52012-08-17 16:53:09 -0400217 a = (a-1 & MASK);
Rich Felker415c4cd2012-04-10 11:52:55 -0400218 if (a == z) {
219 z = (z-1 & MASK);
220 x[z-1 & MASK] |= x[z];
221 }
Rich Felker415c4cd2012-04-10 11:52:55 -0400222 x[a] = carry;
223 }
224 }
225
Rich Felkerfe514952012-04-12 00:16:01 -0400226 /* Downscale until exactly number of bits are left of radix point */
Rich Felker415c4cd2012-04-10 11:52:55 -0400227 for (;;) {
228 uint32_t carry = 0;
229 int sh = 1;
230 for (i=0; i<LD_B1B_DIG; i++) {
231 k = (a+i & MASK);
232 if (k == z || x[k] < th[i]) {
233 i=LD_B1B_DIG;
234 break;
235 }
236 if (x[a+i & MASK] > th[i]) break;
237 }
238 if (i==LD_B1B_DIG && rp==9*LD_B1B_DIG) break;
239 /* FIXME: find a way to compute optimal sh */
240 if (rp > 9+9*LD_B1B_DIG) sh = 9;
241 e2 += sh;
Rich Felker470fecd2012-04-11 23:08:50 -0400242 for (k=a; k!=z; k=(k+1 & MASK)) {
Rich Felker415c4cd2012-04-10 11:52:55 -0400243 uint32_t tmp = x[k] & (1<<sh)-1;
244 x[k] = (x[k]>>sh) + carry;
245 carry = (1000000000>>sh) * tmp;
246 if (k==a && !x[k]) {
247 a = (a+1 & MASK);
Rich Felker4054da92012-04-11 14:51:08 -0400248 i--;
Rich Felker415c4cd2012-04-10 11:52:55 -0400249 rp -= 9;
250 }
251 }
Rich Felker470fecd2012-04-11 23:08:50 -0400252 if (carry) {
Rich Felker415c4cd2012-04-10 11:52:55 -0400253 if ((z+1 & MASK) != a) {
254 x[z] = carry;
255 z = (z+1 & MASK);
256 } else x[z-1 & MASK] |= 1;
257 }
258 }
259
Rich Felkerfe514952012-04-12 00:16:01 -0400260 /* Assemble desired bits into floating point variable */
Rich Felker38b3f1f2012-04-10 23:41:54 -0400261 for (y=i=0; i<LD_B1B_DIG; i++) {
Rich Felker28c5d462012-04-30 02:56:47 -0400262 if ((a+i & MASK)==z) x[(z=(z+1 & MASK))-1] = 0;
Rich Felker415c4cd2012-04-10 11:52:55 -0400263 y = 1000000000.0L * y + x[a+i & MASK];
Rich Felker38b3f1f2012-04-10 23:41:54 -0400264 }
Rich Felker415c4cd2012-04-10 11:52:55 -0400265
266 y *= sign;
267
Rich Felkerfe514952012-04-12 00:16:01 -0400268 /* Limit precision for denormal results */
Rich Felker415c4cd2012-04-10 11:52:55 -0400269 if (bits > LDBL_MANT_DIG+e2-emin) {
270 bits = LDBL_MANT_DIG+e2-emin;
271 if (bits<0) bits=0;
Rich Felker77731d02012-04-21 14:14:10 -0400272 denormal = 1;
Rich Felker415c4cd2012-04-10 11:52:55 -0400273 }
274
Rich Felkerfe514952012-04-12 00:16:01 -0400275 /* Calculate bias term to force rounding, move out lower bits */
Rich Felker415c4cd2012-04-10 11:52:55 -0400276 if (bits < LDBL_MANT_DIG) {
277 bias = copysignl(scalbn(1, 2*LDBL_MANT_DIG-bits-1), y);
278 frac = fmodl(y, scalbn(1, LDBL_MANT_DIG-bits));
279 y -= frac;
280 y += bias;
281 }
282
Rich Felkerfe514952012-04-12 00:16:01 -0400283 /* Process tail of decimal input so it can affect rounding */
Rich Felker415c4cd2012-04-10 11:52:55 -0400284 if ((a+i & MASK) != z) {
285 uint32_t t = x[a+i & MASK];
286 if (t < 500000000 && (t || (a+i+1 & MASK) != z))
287 frac += 0.25*sign;
288 else if (t > 500000000)
289 frac += 0.75*sign;
290 else if (t == 500000000) {
291 if ((a+i+1 & MASK) == z)
292 frac += 0.5*sign;
293 else
294 frac += 0.75*sign;
295 }
296 if (LDBL_MANT_DIG-bits >= 2 && !fmodl(frac, 1))
297 frac++;
298 }
299
300 y += frac;
301 y -= bias;
302
Rich Felker77731d02012-04-21 14:14:10 -0400303 if ((e2+LDBL_MANT_DIG & INT_MAX) > emax-5) {
304 if (fabs(y) >= CONCAT(0x1p, LDBL_MANT_DIG)) {
305 if (denormal && bits==LDBL_MANT_DIG+e2-emin)
306 denormal = 0;
307 y *= 0.5;
308 e2++;
309 }
310 if (e2+LDBL_MANT_DIG>emax || (denormal && frac))
311 errno = ERANGE;
312 }
Rich Felker415c4cd2012-04-10 11:52:55 -0400313
Rich Felker77731d02012-04-21 14:14:10 -0400314 return scalbnl(y, e2);
Rich Felker415c4cd2012-04-10 11:52:55 -0400315}
316
Rich Felker21625412012-04-10 21:47:37 -0400317static long double hexfloat(FILE *f, int bits, int emin, int sign, int pok)
Rich Felker415c4cd2012-04-10 11:52:55 -0400318{
319 uint32_t x = 0;
320 long double y = 0;
321 long double scale = 1;
322 long double bias = 0;
323 int gottail = 0, gotrad = 0, gotdig = 0;
324 long long rp = 0;
325 long long dc = 0;
326 long long e2 = 0;
327 int d;
Rich Felker21625412012-04-10 21:47:37 -0400328 int c;
Rich Felker415c4cd2012-04-10 11:52:55 -0400329
Rich Felker21625412012-04-10 21:47:37 -0400330 c = shgetc(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400331
332 /* Skip leading zeros */
Rich Felker21625412012-04-10 21:47:37 -0400333 for (; c=='0'; c = shgetc(f)) gotdig = 1;
Rich Felker415c4cd2012-04-10 11:52:55 -0400334
335 if (c=='.') {
336 gotrad = 1;
Rich Felker21625412012-04-10 21:47:37 -0400337 c = shgetc(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400338 /* Count zeros after the radix point before significand */
Rich Felker21625412012-04-10 21:47:37 -0400339 for (rp=0; c=='0'; c = shgetc(f), rp--) gotdig = 1;
Rich Felker415c4cd2012-04-10 11:52:55 -0400340 }
341
Rich Felker21625412012-04-10 21:47:37 -0400342 for (; c-'0'<10U || (c|32)-'a'<6U || c=='.'; c = shgetc(f)) {
Rich Felker415c4cd2012-04-10 11:52:55 -0400343 if (c=='.') {
344 if (gotrad) break;
345 rp = dc;
346 gotrad = 1;
347 } else {
348 gotdig = 1;
349 if (c > '9') d = (c|32)+10-'a';
350 else d = c-'0';
351 if (dc<8) {
352 x = x*16 + d;
353 } else if (dc < LDBL_MANT_DIG/4+1) {
354 y += d*(scale/=16);
355 } else if (d && !gottail) {
356 y += 0.5*scale;
357 gottail = 1;
358 }
359 dc++;
360 }
361 }
362 if (!gotdig) {
Rich Felker21625412012-04-10 21:47:37 -0400363 shunget(f);
364 if (pok) {
365 shunget(f);
366 if (gotrad) shunget(f);
367 } else {
368 shlim(f, 0);
Rich Felker415c4cd2012-04-10 11:52:55 -0400369 }
Rich Felkerf457b1c2012-06-08 11:17:49 -0400370 return sign * 0.0;
Rich Felker415c4cd2012-04-10 11:52:55 -0400371 }
372 if (!gotrad) rp = dc;
373 while (dc<8) x *= 16, dc++;
374 if ((c|32)=='p') {
Rich Felker21625412012-04-10 21:47:37 -0400375 e2 = scanexp(f, pok);
Rich Felker415c4cd2012-04-10 11:52:55 -0400376 if (e2 == LLONG_MIN) {
Rich Felker21625412012-04-10 21:47:37 -0400377 if (pok) {
378 shunget(f);
379 } else {
380 shlim(f, 0);
Rich Felker415c4cd2012-04-10 11:52:55 -0400381 return 0;
382 }
383 e2 = 0;
384 }
Rich Felker48bb81a2012-04-11 00:18:57 -0400385 } else {
386 shunget(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400387 }
388 e2 += 4*rp - 32;
389
390 if (!x) return sign * 0.0;
Rich Felkerc5ff2962012-04-10 22:38:21 -0400391 if (e2 > -emin) {
392 errno = ERANGE;
393 return sign * LDBL_MAX * LDBL_MAX;
394 }
395 if (e2 < emin-2*LDBL_MANT_DIG) {
396 errno = ERANGE;
397 return sign * LDBL_MIN * LDBL_MIN;
398 }
Rich Felker415c4cd2012-04-10 11:52:55 -0400399
400 while (x < 0x80000000) {
401 if (y>=0.5) {
402 x += x + 1;
403 y += y - 1;
404 } else {
405 x += x;
406 y += y;
407 }
408 e2--;
409 }
410
411 if (bits > 32+e2-emin) {
412 bits = 32+e2-emin;
413 if (bits<0) bits=0;
414 }
415
416 if (bits < LDBL_MANT_DIG)
417 bias = copysignl(scalbn(1, 32+LDBL_MANT_DIG-bits-1), sign);
418
419 if (bits<32 && y && !(x&1)) x++, y=0;
420
421 y = bias + sign*(long double)x + sign*y;
422 y -= bias;
423
Rich Felkerc5ff2962012-04-10 22:38:21 -0400424 if (!y) errno = ERANGE;
425
Rich Felker415c4cd2012-04-10 11:52:55 -0400426 return scalbnl(y, e2);
427}
428
Rich Felkercb81b692012-04-19 12:47:34 -0400429long double __floatscan(FILE *f, int prec, int pok)
Rich Felker415c4cd2012-04-10 11:52:55 -0400430{
431 int sign = 1;
Rich Felker84898972012-10-21 18:28:20 -0400432 size_t i;
Rich Felker415c4cd2012-04-10 11:52:55 -0400433 int bits;
434 int emin;
Rich Felkercb81b692012-04-19 12:47:34 -0400435 int c;
Rich Felker415c4cd2012-04-10 11:52:55 -0400436
Rich Felker415c4cd2012-04-10 11:52:55 -0400437 switch (prec) {
438 case 0:
Rich Felker3ddeedd2012-04-12 00:25:52 -0400439 bits = FLT_MANT_DIG;
440 emin = FLT_MIN_EXP-bits;
Rich Felker415c4cd2012-04-10 11:52:55 -0400441 break;
442 case 1:
Rich Felker3ddeedd2012-04-12 00:25:52 -0400443 bits = DBL_MANT_DIG;
444 emin = DBL_MIN_EXP-bits;
Rich Felker415c4cd2012-04-10 11:52:55 -0400445 break;
446 case 2:
447 bits = LDBL_MANT_DIG;
Rich Felker3ddeedd2012-04-12 00:25:52 -0400448 emin = LDBL_MIN_EXP-bits;
Rich Felker415c4cd2012-04-10 11:52:55 -0400449 break;
450 default:
451 return 0;
452 }
453
Rich Felkercb81b692012-04-19 12:47:34 -0400454 while (isspace((c=shgetc(f))));
Rich Felker415c4cd2012-04-10 11:52:55 -0400455
456 if (c=='+' || c=='-') {
457 sign -= 2*(c=='-');
Rich Felker21625412012-04-10 21:47:37 -0400458 c = shgetc(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400459 }
460
461 for (i=0; i<8 && (c|32)=="infinity"[i]; i++)
Rich Felker21625412012-04-10 21:47:37 -0400462 if (i<7) c = shgetc(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400463 if (i==3 || i==8 || (i>3 && pok)) {
Rich Felkerdad40402012-04-17 22:05:51 -0400464 if (i!=8) {
465 shunget(f);
466 if (pok) for (; i>3; i--) shunget(f);
467 }
Rich Felker415c4cd2012-04-10 11:52:55 -0400468 return sign * INFINITY;
469 }
470 if (!i) for (i=0; i<3 && (c|32)=="nan"[i]; i++)
Rich Felker33e77812012-04-21 11:57:39 -0400471 if (i<2) c = shgetc(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400472 if (i==3) {
Rich Felker84898972012-10-21 18:28:20 -0400473 if (shgetc(f) != '(') {
474 shunget(f);
475 return NAN;
476 }
477 for (i=1; ; i++) {
478 c = shgetc(f);
479 if (c-'0'<10U || c-'A'<26U || c-'a'<26U || c=='_')
480 continue;
481 if (c==')') return NAN;
482 shunget(f);
483 if (!pok) {
484 errno = EINVAL;
485 shlim(f, 0);
486 return 0;
487 }
488 while (i--) shunget(f);
489 return NAN;
490 }
Rich Felker21625412012-04-10 21:47:37 -0400491 return NAN;
Rich Felker415c4cd2012-04-10 11:52:55 -0400492 }
493
494 if (i) {
Rich Felker21625412012-04-10 21:47:37 -0400495 shunget(f);
Rich Felkerc5ff2962012-04-10 22:38:21 -0400496 errno = EINVAL;
Rich Felker21625412012-04-10 21:47:37 -0400497 shlim(f, 0);
Rich Felker415c4cd2012-04-10 11:52:55 -0400498 return 0;
499 }
500
501 if (c=='0') {
Rich Felker21625412012-04-10 21:47:37 -0400502 c = shgetc(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400503 if ((c|32) == 'x')
Rich Felker21625412012-04-10 21:47:37 -0400504 return hexfloat(f, bits, emin, sign, pok);
Rich Felker48bb81a2012-04-11 00:18:57 -0400505 shunget(f);
Rich Felker415c4cd2012-04-10 11:52:55 -0400506 c = '0';
507 }
508
Rich Felker48bb81a2012-04-11 00:18:57 -0400509 return decfloat(f, c, bits, emin, sign, pok);
Rich Felker415c4cd2012-04-10 11:52:55 -0400510}