1 | /* -*- Mode: C; c-file-style: "python" -*- */ |
2 | |
3 | #include <Python.h> |
4 | #include "pycore_dtoa.h" |
5 | #include <locale.h> |
6 | |
7 | /* Case-insensitive string match used for nan and inf detection; t should be |
8 | lower-case. Returns 1 for a successful match, 0 otherwise. */ |
9 | |
10 | static int |
11 | case_insensitive_match(const char *s, const char *t) |
12 | { |
13 | while(*t && Py_TOLOWER(*s) == *t) { |
14 | s++; |
15 | t++; |
16 | } |
17 | return *t ? 0 : 1; |
18 | } |
19 | |
20 | /* _Py_parse_inf_or_nan: Attempt to parse a string of the form "nan", "inf" or |
21 | "infinity", with an optional leading sign of "+" or "-". On success, |
22 | return the NaN or Infinity as a double and set *endptr to point just beyond |
23 | the successfully parsed portion of the string. On failure, return -1.0 and |
24 | set *endptr to point to the start of the string. */ |
25 | |
26 | #ifndef PY_NO_SHORT_FLOAT_REPR |
27 | |
28 | double |
29 | _Py_parse_inf_or_nan(const char *p, char **endptr) |
30 | { |
31 | double retval; |
32 | const char *s; |
33 | int negate = 0; |
34 | |
35 | s = p; |
36 | if (*s == '-') { |
37 | negate = 1; |
38 | s++; |
39 | } |
40 | else if (*s == '+') { |
41 | s++; |
42 | } |
43 | if (case_insensitive_match(s, "inf" )) { |
44 | s += 3; |
45 | if (case_insensitive_match(s, "inity" )) |
46 | s += 5; |
47 | retval = _Py_dg_infinity(negate); |
48 | } |
49 | else if (case_insensitive_match(s, "nan" )) { |
50 | s += 3; |
51 | retval = _Py_dg_stdnan(negate); |
52 | } |
53 | else { |
54 | s = p; |
55 | retval = -1.0; |
56 | } |
57 | *endptr = (char *)s; |
58 | return retval; |
59 | } |
60 | |
61 | #else |
62 | |
63 | double |
64 | _Py_parse_inf_or_nan(const char *p, char **endptr) |
65 | { |
66 | double retval; |
67 | const char *s; |
68 | int negate = 0; |
69 | |
70 | s = p; |
71 | if (*s == '-') { |
72 | negate = 1; |
73 | s++; |
74 | } |
75 | else if (*s == '+') { |
76 | s++; |
77 | } |
78 | if (case_insensitive_match(s, "inf" )) { |
79 | s += 3; |
80 | if (case_insensitive_match(s, "inity" )) |
81 | s += 5; |
82 | retval = negate ? -Py_HUGE_VAL : Py_HUGE_VAL; |
83 | } |
84 | #ifdef Py_NAN |
85 | else if (case_insensitive_match(s, "nan" )) { |
86 | s += 3; |
87 | retval = negate ? -Py_NAN : Py_NAN; |
88 | } |
89 | #endif |
90 | else { |
91 | s = p; |
92 | retval = -1.0; |
93 | } |
94 | *endptr = (char *)s; |
95 | return retval; |
96 | } |
97 | |
98 | #endif |
99 | |
100 | /** |
101 | * _PyOS_ascii_strtod: |
102 | * @nptr: the string to convert to a numeric value. |
103 | * @endptr: if non-%NULL, it returns the character after |
104 | * the last character used in the conversion. |
105 | * |
106 | * Converts a string to a #gdouble value. |
107 | * This function behaves like the standard strtod() function |
108 | * does in the C locale. It does this without actually |
109 | * changing the current locale, since that would not be |
110 | * thread-safe. |
111 | * |
112 | * This function is typically used when reading configuration |
113 | * files or other non-user input that should be locale independent. |
114 | * To handle input from the user you should normally use the |
115 | * locale-sensitive system strtod() function. |
116 | * |
117 | * If the correct value would cause overflow, plus or minus %HUGE_VAL |
118 | * is returned (according to the sign of the value), and %ERANGE is |
119 | * stored in %errno. If the correct value would cause underflow, |
120 | * zero is returned and %ERANGE is stored in %errno. |
121 | * If memory allocation fails, %ENOMEM is stored in %errno. |
122 | * |
123 | * This function resets %errno before calling strtod() so that |
124 | * you can reliably detect overflow and underflow. |
125 | * |
126 | * Return value: the #gdouble value. |
127 | **/ |
128 | |
129 | #ifndef PY_NO_SHORT_FLOAT_REPR |
130 | |
131 | static double |
132 | _PyOS_ascii_strtod(const char *nptr, char **endptr) |
133 | { |
134 | double result; |
135 | _Py_SET_53BIT_PRECISION_HEADER; |
136 | |
137 | assert(nptr != NULL); |
138 | /* Set errno to zero, so that we can distinguish zero results |
139 | and underflows */ |
140 | errno = 0; |
141 | |
142 | _Py_SET_53BIT_PRECISION_START; |
143 | result = _Py_dg_strtod(nptr, endptr); |
144 | _Py_SET_53BIT_PRECISION_END; |
145 | |
146 | if (*endptr == nptr) |
147 | /* string might represent an inf or nan */ |
148 | result = _Py_parse_inf_or_nan(nptr, endptr); |
149 | |
150 | return result; |
151 | |
152 | } |
153 | |
154 | #else |
155 | |
156 | /* |
157 | Use system strtod; since strtod is locale aware, we may |
158 | have to first fix the decimal separator. |
159 | |
160 | Note that unlike _Py_dg_strtod, the system strtod may not always give |
161 | correctly rounded results. |
162 | */ |
163 | |
164 | static double |
165 | _PyOS_ascii_strtod(const char *nptr, char **endptr) |
166 | { |
167 | char *fail_pos; |
168 | double val; |
169 | struct lconv *locale_data; |
170 | const char *decimal_point; |
171 | size_t decimal_point_len; |
172 | const char *p, *decimal_point_pos; |
173 | const char *end = NULL; /* Silence gcc */ |
174 | const char *digits_pos = NULL; |
175 | int negate = 0; |
176 | |
177 | assert(nptr != NULL); |
178 | |
179 | fail_pos = NULL; |
180 | |
181 | locale_data = localeconv(); |
182 | decimal_point = locale_data->decimal_point; |
183 | decimal_point_len = strlen(decimal_point); |
184 | |
185 | assert(decimal_point_len != 0); |
186 | |
187 | decimal_point_pos = NULL; |
188 | |
189 | /* Parse infinities and nans */ |
190 | val = _Py_parse_inf_or_nan(nptr, endptr); |
191 | if (*endptr != nptr) |
192 | return val; |
193 | |
194 | /* Set errno to zero, so that we can distinguish zero results |
195 | and underflows */ |
196 | errno = 0; |
197 | |
198 | /* We process the optional sign manually, then pass the remainder to |
199 | the system strtod. This ensures that the result of an underflow |
200 | has the correct sign. (bug #1725) */ |
201 | p = nptr; |
202 | /* Process leading sign, if present */ |
203 | if (*p == '-') { |
204 | negate = 1; |
205 | p++; |
206 | } |
207 | else if (*p == '+') { |
208 | p++; |
209 | } |
210 | |
211 | /* Some platform strtods accept hex floats; Python shouldn't (at the |
212 | moment), so we check explicitly for strings starting with '0x'. */ |
213 | if (*p == '0' && (*(p+1) == 'x' || *(p+1) == 'X')) |
214 | goto invalid_string; |
215 | |
216 | /* Check that what's left begins with a digit or decimal point */ |
217 | if (!Py_ISDIGIT(*p) && *p != '.') |
218 | goto invalid_string; |
219 | |
220 | digits_pos = p; |
221 | if (decimal_point[0] != '.' || |
222 | decimal_point[1] != 0) |
223 | { |
224 | /* Look for a '.' in the input; if present, it'll need to be |
225 | swapped for the current locale's decimal point before we |
226 | call strtod. On the other hand, if we find the current |
227 | locale's decimal point then the input is invalid. */ |
228 | while (Py_ISDIGIT(*p)) |
229 | p++; |
230 | |
231 | if (*p == '.') |
232 | { |
233 | decimal_point_pos = p++; |
234 | |
235 | /* locate end of number */ |
236 | while (Py_ISDIGIT(*p)) |
237 | p++; |
238 | |
239 | if (*p == 'e' || *p == 'E') |
240 | p++; |
241 | if (*p == '+' || *p == '-') |
242 | p++; |
243 | while (Py_ISDIGIT(*p)) |
244 | p++; |
245 | end = p; |
246 | } |
247 | else if (strncmp(p, decimal_point, decimal_point_len) == 0) |
248 | /* Python bug #1417699 */ |
249 | goto invalid_string; |
250 | /* For the other cases, we need not convert the decimal |
251 | point */ |
252 | } |
253 | |
254 | if (decimal_point_pos) { |
255 | char *copy, *c; |
256 | /* Create a copy of the input, with the '.' converted to the |
257 | locale-specific decimal point */ |
258 | copy = (char *)PyMem_Malloc(end - digits_pos + |
259 | 1 + decimal_point_len); |
260 | if (copy == NULL) { |
261 | *endptr = (char *)nptr; |
262 | errno = ENOMEM; |
263 | return val; |
264 | } |
265 | |
266 | c = copy; |
267 | memcpy(c, digits_pos, decimal_point_pos - digits_pos); |
268 | c += decimal_point_pos - digits_pos; |
269 | memcpy(c, decimal_point, decimal_point_len); |
270 | c += decimal_point_len; |
271 | memcpy(c, decimal_point_pos + 1, |
272 | end - (decimal_point_pos + 1)); |
273 | c += end - (decimal_point_pos + 1); |
274 | *c = 0; |
275 | |
276 | val = strtod(copy, &fail_pos); |
277 | |
278 | if (fail_pos) |
279 | { |
280 | if (fail_pos > decimal_point_pos) |
281 | fail_pos = (char *)digits_pos + |
282 | (fail_pos - copy) - |
283 | (decimal_point_len - 1); |
284 | else |
285 | fail_pos = (char *)digits_pos + |
286 | (fail_pos - copy); |
287 | } |
288 | |
289 | PyMem_Free(copy); |
290 | |
291 | } |
292 | else { |
293 | val = strtod(digits_pos, &fail_pos); |
294 | } |
295 | |
296 | if (fail_pos == digits_pos) |
297 | goto invalid_string; |
298 | |
299 | if (negate && fail_pos != nptr) |
300 | val = -val; |
301 | *endptr = fail_pos; |
302 | |
303 | return val; |
304 | |
305 | invalid_string: |
306 | *endptr = (char*)nptr; |
307 | errno = EINVAL; |
308 | return -1.0; |
309 | } |
310 | |
311 | #endif |
312 | |
313 | /* PyOS_string_to_double converts a null-terminated byte string s (interpreted |
314 | as a string of ASCII characters) to a float. The string should not have |
315 | leading or trailing whitespace. The conversion is independent of the |
316 | current locale. |
317 | |
318 | If endptr is NULL, try to convert the whole string. Raise ValueError and |
319 | return -1.0 if the string is not a valid representation of a floating-point |
320 | number. |
321 | |
322 | If endptr is non-NULL, try to convert as much of the string as possible. |
323 | If no initial segment of the string is the valid representation of a |
324 | floating-point number then *endptr is set to point to the beginning of the |
325 | string, -1.0 is returned and again ValueError is raised. |
326 | |
327 | On overflow (e.g., when trying to convert '1e500' on an IEEE 754 machine), |
328 | if overflow_exception is NULL then +-Py_HUGE_VAL is returned, and no Python |
329 | exception is raised. Otherwise, overflow_exception should point to |
330 | a Python exception, this exception will be raised, -1.0 will be returned, |
331 | and *endptr will point just past the end of the converted value. |
332 | |
333 | If any other failure occurs (for example lack of memory), -1.0 is returned |
334 | and the appropriate Python exception will have been set. |
335 | */ |
336 | |
337 | double |
338 | PyOS_string_to_double(const char *s, |
339 | char **endptr, |
340 | PyObject *overflow_exception) |
341 | { |
342 | double x, result=-1.0; |
343 | char *fail_pos; |
344 | |
345 | errno = 0; |
346 | x = _PyOS_ascii_strtod(s, &fail_pos); |
347 | |
348 | if (errno == ENOMEM) { |
349 | PyErr_NoMemory(); |
350 | fail_pos = (char *)s; |
351 | } |
352 | else if (!endptr && (fail_pos == s || *fail_pos != '\0')) |
353 | PyErr_Format(PyExc_ValueError, |
354 | "could not convert string to float: " |
355 | "'%.200s'" , s); |
356 | else if (fail_pos == s) |
357 | PyErr_Format(PyExc_ValueError, |
358 | "could not convert string to float: " |
359 | "'%.200s'" , s); |
360 | else if (errno == ERANGE && fabs(x) >= 1.0 && overflow_exception) |
361 | PyErr_Format(overflow_exception, |
362 | "value too large to convert to float: " |
363 | "'%.200s'" , s); |
364 | else |
365 | result = x; |
366 | |
367 | if (endptr != NULL) |
368 | *endptr = fail_pos; |
369 | return result; |
370 | } |
371 | |
372 | /* Remove underscores that follow the underscore placement rule from |
373 | the string and then call the `innerfunc` function on the result. |
374 | It should return a new object or NULL on exception. |
375 | |
376 | `what` is used for the error message emitted when underscores are detected |
377 | that don't follow the rule. `arg` is an opaque pointer passed to the inner |
378 | function. |
379 | |
380 | This is used to implement underscore-agnostic conversion for floats |
381 | and complex numbers. |
382 | */ |
383 | PyObject * |
384 | _Py_string_to_number_with_underscores( |
385 | const char *s, Py_ssize_t orig_len, const char *what, PyObject *obj, void *arg, |
386 | PyObject *(*innerfunc)(const char *, Py_ssize_t, void *)) |
387 | { |
388 | char prev; |
389 | const char *p, *last; |
390 | char *dup, *end; |
391 | PyObject *result; |
392 | |
393 | assert(s[orig_len] == '\0'); |
394 | |
395 | if (strchr(s, '_') == NULL) { |
396 | return innerfunc(s, orig_len, arg); |
397 | } |
398 | |
399 | dup = PyMem_Malloc(orig_len + 1); |
400 | if (dup == NULL) { |
401 | return PyErr_NoMemory(); |
402 | } |
403 | end = dup; |
404 | prev = '\0'; |
405 | last = s + orig_len; |
406 | for (p = s; *p; p++) { |
407 | if (*p == '_') { |
408 | /* Underscores are only allowed after digits. */ |
409 | if (!(prev >= '0' && prev <= '9')) { |
410 | goto error; |
411 | } |
412 | } |
413 | else { |
414 | *end++ = *p; |
415 | /* Underscores are only allowed before digits. */ |
416 | if (prev == '_' && !(*p >= '0' && *p <= '9')) { |
417 | goto error; |
418 | } |
419 | } |
420 | prev = *p; |
421 | } |
422 | /* Underscores are not allowed at the end. */ |
423 | if (prev == '_') { |
424 | goto error; |
425 | } |
426 | /* No embedded NULs allowed. */ |
427 | if (p != last) { |
428 | goto error; |
429 | } |
430 | *end = '\0'; |
431 | result = innerfunc(dup, end - dup, arg); |
432 | PyMem_Free(dup); |
433 | return result; |
434 | |
435 | error: |
436 | PyMem_Free(dup); |
437 | PyErr_Format(PyExc_ValueError, |
438 | "could not convert string to %s: " |
439 | "%R" , what, obj); |
440 | return NULL; |
441 | } |
442 | |
443 | #ifdef PY_NO_SHORT_FLOAT_REPR |
444 | |
445 | /* Given a string that may have a decimal point in the current |
446 | locale, change it back to a dot. Since the string cannot get |
447 | longer, no need for a maximum buffer size parameter. */ |
448 | Py_LOCAL_INLINE(void) |
449 | change_decimal_from_locale_to_dot(char* buffer) |
450 | { |
451 | struct lconv *locale_data = localeconv(); |
452 | const char *decimal_point = locale_data->decimal_point; |
453 | |
454 | if (decimal_point[0] != '.' || decimal_point[1] != 0) { |
455 | size_t decimal_point_len = strlen(decimal_point); |
456 | |
457 | if (*buffer == '+' || *buffer == '-') |
458 | buffer++; |
459 | while (Py_ISDIGIT(*buffer)) |
460 | buffer++; |
461 | if (strncmp(buffer, decimal_point, decimal_point_len) == 0) { |
462 | *buffer = '.'; |
463 | buffer++; |
464 | if (decimal_point_len > 1) { |
465 | /* buffer needs to get smaller */ |
466 | size_t rest_len = strlen(buffer + |
467 | (decimal_point_len - 1)); |
468 | memmove(buffer, |
469 | buffer + (decimal_point_len - 1), |
470 | rest_len); |
471 | buffer[rest_len] = 0; |
472 | } |
473 | } |
474 | } |
475 | } |
476 | |
477 | |
478 | /* From the C99 standard, section 7.19.6: |
479 | The exponent always contains at least two digits, and only as many more digits |
480 | as necessary to represent the exponent. |
481 | */ |
482 | #define MIN_EXPONENT_DIGITS 2 |
483 | |
484 | /* Ensure that any exponent, if present, is at least MIN_EXPONENT_DIGITS |
485 | in length. */ |
486 | Py_LOCAL_INLINE(void) |
487 | ensure_minimum_exponent_length(char* buffer, size_t buf_size) |
488 | { |
489 | char *p = strpbrk(buffer, "eE" ); |
490 | if (p && (*(p + 1) == '-' || *(p + 1) == '+')) { |
491 | char *start = p + 2; |
492 | int exponent_digit_cnt = 0; |
493 | int leading_zero_cnt = 0; |
494 | int in_leading_zeros = 1; |
495 | int significant_digit_cnt; |
496 | |
497 | /* Skip over the exponent and the sign. */ |
498 | p += 2; |
499 | |
500 | /* Find the end of the exponent, keeping track of leading |
501 | zeros. */ |
502 | while (*p && Py_ISDIGIT(*p)) { |
503 | if (in_leading_zeros && *p == '0') |
504 | ++leading_zero_cnt; |
505 | if (*p != '0') |
506 | in_leading_zeros = 0; |
507 | ++p; |
508 | ++exponent_digit_cnt; |
509 | } |
510 | |
511 | significant_digit_cnt = exponent_digit_cnt - leading_zero_cnt; |
512 | if (exponent_digit_cnt == MIN_EXPONENT_DIGITS) { |
513 | /* If there are 2 exactly digits, we're done, |
514 | regardless of what they contain */ |
515 | } |
516 | else if (exponent_digit_cnt > MIN_EXPONENT_DIGITS) { |
517 | int extra_zeros_cnt; |
518 | |
519 | /* There are more than 2 digits in the exponent. See |
520 | if we can delete some of the leading zeros */ |
521 | if (significant_digit_cnt < MIN_EXPONENT_DIGITS) |
522 | significant_digit_cnt = MIN_EXPONENT_DIGITS; |
523 | extra_zeros_cnt = exponent_digit_cnt - |
524 | significant_digit_cnt; |
525 | |
526 | /* Delete extra_zeros_cnt worth of characters from the |
527 | front of the exponent */ |
528 | assert(extra_zeros_cnt >= 0); |
529 | |
530 | /* Add one to significant_digit_cnt to copy the |
531 | trailing 0 byte, thus setting the length */ |
532 | memmove(start, |
533 | start + extra_zeros_cnt, |
534 | significant_digit_cnt + 1); |
535 | } |
536 | else { |
537 | /* If there are fewer than 2 digits, add zeros |
538 | until there are 2, if there's enough room */ |
539 | int zeros = MIN_EXPONENT_DIGITS - exponent_digit_cnt; |
540 | if (start + zeros + exponent_digit_cnt + 1 |
541 | < buffer + buf_size) { |
542 | memmove(start + zeros, start, |
543 | exponent_digit_cnt + 1); |
544 | memset(start, '0', zeros); |
545 | } |
546 | } |
547 | } |
548 | } |
549 | |
550 | /* Remove trailing zeros after the decimal point from a numeric string; also |
551 | remove the decimal point if all digits following it are zero. The numeric |
552 | string must end in '\0', and should not have any leading or trailing |
553 | whitespace. Assumes that the decimal point is '.'. */ |
554 | Py_LOCAL_INLINE(void) |
555 | remove_trailing_zeros(char *buffer) |
556 | { |
557 | char *old_fraction_end, *new_fraction_end, *end, *p; |
558 | |
559 | p = buffer; |
560 | if (*p == '-' || *p == '+') |
561 | /* Skip leading sign, if present */ |
562 | ++p; |
563 | while (Py_ISDIGIT(*p)) |
564 | ++p; |
565 | |
566 | /* if there's no decimal point there's nothing to do */ |
567 | if (*p++ != '.') |
568 | return; |
569 | |
570 | /* scan any digits after the point */ |
571 | while (Py_ISDIGIT(*p)) |
572 | ++p; |
573 | old_fraction_end = p; |
574 | |
575 | /* scan up to ending '\0' */ |
576 | while (*p != '\0') |
577 | p++; |
578 | /* +1 to make sure that we move the null byte as well */ |
579 | end = p+1; |
580 | |
581 | /* scan back from fraction_end, looking for removable zeros */ |
582 | p = old_fraction_end; |
583 | while (*(p-1) == '0') |
584 | --p; |
585 | /* and remove point if we've got that far */ |
586 | if (*(p-1) == '.') |
587 | --p; |
588 | new_fraction_end = p; |
589 | |
590 | memmove(new_fraction_end, old_fraction_end, end-old_fraction_end); |
591 | } |
592 | |
593 | /* Ensure that buffer has a decimal point in it. The decimal point will not |
594 | be in the current locale, it will always be '.'. Don't add a decimal point |
595 | if an exponent is present. Also, convert to exponential notation where |
596 | adding a '.0' would produce too many significant digits (see issue 5864). |
597 | |
598 | Returns a pointer to the fixed buffer, or NULL on failure. |
599 | */ |
600 | Py_LOCAL_INLINE(char *) |
601 | ensure_decimal_point(char* buffer, size_t buf_size, int precision) |
602 | { |
603 | int digit_count, insert_count = 0, convert_to_exp = 0; |
604 | const char *chars_to_insert; |
605 | char *digits_start; |
606 | |
607 | /* search for the first non-digit character */ |
608 | char *p = buffer; |
609 | if (*p == '-' || *p == '+') |
610 | /* Skip leading sign, if present. I think this could only |
611 | ever be '-', but it can't hurt to check for both. */ |
612 | ++p; |
613 | digits_start = p; |
614 | while (*p && Py_ISDIGIT(*p)) |
615 | ++p; |
616 | digit_count = Py_SAFE_DOWNCAST(p - digits_start, Py_ssize_t, int); |
617 | |
618 | if (*p == '.') { |
619 | if (Py_ISDIGIT(*(p+1))) { |
620 | /* Nothing to do, we already have a decimal |
621 | point and a digit after it */ |
622 | } |
623 | else { |
624 | /* We have a decimal point, but no following |
625 | digit. Insert a zero after the decimal. */ |
626 | /* can't ever get here via PyOS_double_to_string */ |
627 | assert(precision == -1); |
628 | ++p; |
629 | chars_to_insert = "0" ; |
630 | insert_count = 1; |
631 | } |
632 | } |
633 | else if (!(*p == 'e' || *p == 'E')) { |
634 | /* Don't add ".0" if we have an exponent. */ |
635 | if (digit_count == precision) { |
636 | /* issue 5864: don't add a trailing .0 in the case |
637 | where the '%g'-formatted result already has as many |
638 | significant digits as were requested. Switch to |
639 | exponential notation instead. */ |
640 | convert_to_exp = 1; |
641 | /* no exponent, no point, and we shouldn't land here |
642 | for infs and nans, so we must be at the end of the |
643 | string. */ |
644 | assert(*p == '\0'); |
645 | } |
646 | else { |
647 | assert(precision == -1 || digit_count < precision); |
648 | chars_to_insert = ".0" ; |
649 | insert_count = 2; |
650 | } |
651 | } |
652 | if (insert_count) { |
653 | size_t buf_len = strlen(buffer); |
654 | if (buf_len + insert_count + 1 >= buf_size) { |
655 | /* If there is not enough room in the buffer |
656 | for the additional text, just skip it. It's |
657 | not worth generating an error over. */ |
658 | } |
659 | else { |
660 | memmove(p + insert_count, p, |
661 | buffer + strlen(buffer) - p + 1); |
662 | memcpy(p, chars_to_insert, insert_count); |
663 | } |
664 | } |
665 | if (convert_to_exp) { |
666 | int written; |
667 | size_t buf_avail; |
668 | p = digits_start; |
669 | /* insert decimal point */ |
670 | assert(digit_count >= 1); |
671 | memmove(p+2, p+1, digit_count); /* safe, but overwrites nul */ |
672 | p[1] = '.'; |
673 | p += digit_count+1; |
674 | assert(p <= buf_size+buffer); |
675 | buf_avail = buf_size+buffer-p; |
676 | if (buf_avail == 0) |
677 | return NULL; |
678 | /* Add exponent. It's okay to use lower case 'e': we only |
679 | arrive here as a result of using the empty format code or |
680 | repr/str builtins and those never want an upper case 'E' */ |
681 | written = PyOS_snprintf(p, buf_avail, "e%+.02d" , digit_count-1); |
682 | if (!(0 <= written && |
683 | written < Py_SAFE_DOWNCAST(buf_avail, size_t, int))) |
684 | /* output truncated, or something else bad happened */ |
685 | return NULL; |
686 | remove_trailing_zeros(buffer); |
687 | } |
688 | return buffer; |
689 | } |
690 | |
691 | /* see FORMATBUFLEN in unicodeobject.c */ |
692 | #define FLOAT_FORMATBUFLEN 120 |
693 | |
694 | /** |
695 | * _PyOS_ascii_formatd: |
696 | * @buffer: A buffer to place the resulting string in |
697 | * @buf_size: The length of the buffer. |
698 | * @format: The printf()-style format to use for the |
699 | * code to use for converting. |
700 | * @d: The #gdouble to convert |
701 | * @precision: The precision to use when formatting. |
702 | * |
703 | * Converts a #gdouble to a string, using the '.' as |
704 | * decimal point. To format the number you pass in |
705 | * a printf()-style format string. Allowed conversion |
706 | * specifiers are 'e', 'E', 'f', 'F', 'g', 'G', and 'Z'. |
707 | * |
708 | * 'Z' is the same as 'g', except it always has a decimal and |
709 | * at least one digit after the decimal. |
710 | * |
711 | * Return value: The pointer to the buffer with the converted string. |
712 | * On failure returns NULL but does not set any Python exception. |
713 | **/ |
714 | static char * |
715 | _PyOS_ascii_formatd(char *buffer, |
716 | size_t buf_size, |
717 | const char *format, |
718 | double d, |
719 | int precision) |
720 | { |
721 | char format_char; |
722 | size_t format_len = strlen(format); |
723 | |
724 | /* Issue 2264: code 'Z' requires copying the format. 'Z' is 'g', but |
725 | also with at least one character past the decimal. */ |
726 | char tmp_format[FLOAT_FORMATBUFLEN]; |
727 | |
728 | /* The last character in the format string must be the format char */ |
729 | format_char = format[format_len - 1]; |
730 | |
731 | if (format[0] != '%') |
732 | return NULL; |
733 | |
734 | /* I'm not sure why this test is here. It's ensuring that the format |
735 | string after the first character doesn't have a single quote, a |
736 | lowercase l, or a percent. This is the reverse of the commented-out |
737 | test about 10 lines ago. */ |
738 | if (strpbrk(format + 1, "'l%" )) |
739 | return NULL; |
740 | |
741 | /* Also curious about this function is that it accepts format strings |
742 | like "%xg", which are invalid for floats. In general, the |
743 | interface to this function is not very good, but changing it is |
744 | difficult because it's a public API. */ |
745 | |
746 | if (!(format_char == 'e' || format_char == 'E' || |
747 | format_char == 'f' || format_char == 'F' || |
748 | format_char == 'g' || format_char == 'G' || |
749 | format_char == 'Z')) |
750 | return NULL; |
751 | |
752 | /* Map 'Z' format_char to 'g', by copying the format string and |
753 | replacing the final char with a 'g' */ |
754 | if (format_char == 'Z') { |
755 | if (format_len + 1 >= sizeof(tmp_format)) { |
756 | /* The format won't fit in our copy. Error out. In |
757 | practice, this will never happen and will be |
758 | detected by returning NULL */ |
759 | return NULL; |
760 | } |
761 | strcpy(tmp_format, format); |
762 | tmp_format[format_len - 1] = 'g'; |
763 | format = tmp_format; |
764 | } |
765 | |
766 | |
767 | /* Have PyOS_snprintf do the hard work */ |
768 | PyOS_snprintf(buffer, buf_size, format, d); |
769 | |
770 | /* Do various fixups on the return string */ |
771 | |
772 | /* Get the current locale, and find the decimal point string. |
773 | Convert that string back to a dot. */ |
774 | change_decimal_from_locale_to_dot(buffer); |
775 | |
776 | /* If an exponent exists, ensure that the exponent is at least |
777 | MIN_EXPONENT_DIGITS digits, providing the buffer is large enough |
778 | for the extra zeros. Also, if there are more than |
779 | MIN_EXPONENT_DIGITS, remove as many zeros as possible until we get |
780 | back to MIN_EXPONENT_DIGITS */ |
781 | ensure_minimum_exponent_length(buffer, buf_size); |
782 | |
783 | /* If format_char is 'Z', make sure we have at least one character |
784 | after the decimal point (and make sure we have a decimal point); |
785 | also switch to exponential notation in some edge cases where the |
786 | extra character would produce more significant digits that we |
787 | really want. */ |
788 | if (format_char == 'Z') |
789 | buffer = ensure_decimal_point(buffer, buf_size, precision); |
790 | |
791 | return buffer; |
792 | } |
793 | |
794 | /* The fallback code to use if _Py_dg_dtoa is not available. */ |
795 | |
796 | char * PyOS_double_to_string(double val, |
797 | char format_code, |
798 | int precision, |
799 | int flags, |
800 | int *type) |
801 | { |
802 | char format[32]; |
803 | Py_ssize_t bufsize; |
804 | char *buf; |
805 | int t, exp; |
806 | int upper = 0; |
807 | |
808 | /* Validate format_code, and map upper and lower case */ |
809 | switch (format_code) { |
810 | case 'e': /* exponent */ |
811 | case 'f': /* fixed */ |
812 | case 'g': /* general */ |
813 | break; |
814 | case 'E': |
815 | upper = 1; |
816 | format_code = 'e'; |
817 | break; |
818 | case 'F': |
819 | upper = 1; |
820 | format_code = 'f'; |
821 | break; |
822 | case 'G': |
823 | upper = 1; |
824 | format_code = 'g'; |
825 | break; |
826 | case 'r': /* repr format */ |
827 | /* Supplied precision is unused, must be 0. */ |
828 | if (precision != 0) { |
829 | PyErr_BadInternalCall(); |
830 | return NULL; |
831 | } |
832 | /* The repr() precision (17 significant decimal digits) is the |
833 | minimal number that is guaranteed to have enough precision |
834 | so that if the number is read back in the exact same binary |
835 | value is recreated. This is true for IEEE floating point |
836 | by design, and also happens to work for all other modern |
837 | hardware. */ |
838 | precision = 17; |
839 | format_code = 'g'; |
840 | break; |
841 | default: |
842 | PyErr_BadInternalCall(); |
843 | return NULL; |
844 | } |
845 | |
846 | /* Here's a quick-and-dirty calculation to figure out how big a buffer |
847 | we need. In general, for a finite float we need: |
848 | |
849 | 1 byte for each digit of the decimal significand, and |
850 | |
851 | 1 for a possible sign |
852 | 1 for a possible decimal point |
853 | 2 for a possible [eE][+-] |
854 | 1 for each digit of the exponent; if we allow 19 digits |
855 | total then we're safe up to exponents of 2**63. |
856 | 1 for the trailing nul byte |
857 | |
858 | This gives a total of 24 + the number of digits in the significand, |
859 | and the number of digits in the significand is: |
860 | |
861 | for 'g' format: at most precision, except possibly |
862 | when precision == 0, when it's 1. |
863 | for 'e' format: precision+1 |
864 | for 'f' format: precision digits after the point, at least 1 |
865 | before. To figure out how many digits appear before the point |
866 | we have to examine the size of the number. If fabs(val) < 1.0 |
867 | then there will be only one digit before the point. If |
868 | fabs(val) >= 1.0, then there are at most |
869 | |
870 | 1+floor(log10(ceiling(fabs(val)))) |
871 | |
872 | digits before the point (where the 'ceiling' allows for the |
873 | possibility that the rounding rounds the integer part of val |
874 | up). A safe upper bound for the above quantity is |
875 | 1+floor(exp/3), where exp is the unique integer such that 0.5 |
876 | <= fabs(val)/2**exp < 1.0. This exp can be obtained from |
877 | frexp. |
878 | |
879 | So we allow room for precision+1 digits for all formats, plus an |
880 | extra floor(exp/3) digits for 'f' format. |
881 | |
882 | */ |
883 | |
884 | if (Py_IS_NAN(val) || Py_IS_INFINITY(val)) |
885 | /* 3 for 'inf'/'nan', 1 for sign, 1 for '\0' */ |
886 | bufsize = 5; |
887 | else { |
888 | bufsize = 25 + precision; |
889 | if (format_code == 'f' && fabs(val) >= 1.0) { |
890 | frexp(val, &exp); |
891 | bufsize += exp/3; |
892 | } |
893 | } |
894 | |
895 | buf = PyMem_Malloc(bufsize); |
896 | if (buf == NULL) { |
897 | PyErr_NoMemory(); |
898 | return NULL; |
899 | } |
900 | |
901 | /* Handle nan and inf. */ |
902 | if (Py_IS_NAN(val)) { |
903 | strcpy(buf, "nan" ); |
904 | t = Py_DTST_NAN; |
905 | } else if (Py_IS_INFINITY(val)) { |
906 | if (copysign(1., val) == 1.) |
907 | strcpy(buf, "inf" ); |
908 | else |
909 | strcpy(buf, "-inf" ); |
910 | t = Py_DTST_INFINITE; |
911 | } else { |
912 | t = Py_DTST_FINITE; |
913 | if (flags & Py_DTSF_ADD_DOT_0) |
914 | format_code = 'Z'; |
915 | |
916 | PyOS_snprintf(format, sizeof(format), "%%%s.%i%c" , |
917 | (flags & Py_DTSF_ALT ? "#" : "" ), precision, |
918 | format_code); |
919 | _PyOS_ascii_formatd(buf, bufsize, format, val, precision); |
920 | } |
921 | |
922 | /* Add sign when requested. It's convenient (esp. when formatting |
923 | complex numbers) to include a sign even for inf and nan. */ |
924 | if (flags & Py_DTSF_SIGN && buf[0] != '-') { |
925 | size_t len = strlen(buf); |
926 | /* the bufsize calculations above should ensure that we've got |
927 | space to add a sign */ |
928 | assert((size_t)bufsize >= len+2); |
929 | memmove(buf+1, buf, len+1); |
930 | buf[0] = '+'; |
931 | } |
932 | if (upper) { |
933 | /* Convert to upper case. */ |
934 | char *p1; |
935 | for (p1 = buf; *p1; p1++) |
936 | *p1 = Py_TOUPPER(*p1); |
937 | } |
938 | |
939 | if (type) |
940 | *type = t; |
941 | return buf; |
942 | } |
943 | |
944 | #else |
945 | |
946 | /* _Py_dg_dtoa is available. */ |
947 | |
948 | /* I'm using a lookup table here so that I don't have to invent a non-locale |
949 | specific way to convert to uppercase */ |
950 | #define OFS_INF 0 |
951 | #define OFS_NAN 1 |
952 | #define OFS_E 2 |
953 | |
954 | /* The lengths of these are known to the code below, so don't change them */ |
955 | static const char * const lc_float_strings[] = { |
956 | "inf" , |
957 | "nan" , |
958 | "e" , |
959 | }; |
960 | static const char * const uc_float_strings[] = { |
961 | "INF" , |
962 | "NAN" , |
963 | "E" , |
964 | }; |
965 | |
966 | |
967 | /* Convert a double d to a string, and return a PyMem_Malloc'd block of |
968 | memory contain the resulting string. |
969 | |
970 | Arguments: |
971 | d is the double to be converted |
972 | format_code is one of 'e', 'f', 'g', 'r'. 'e', 'f' and 'g' |
973 | correspond to '%e', '%f' and '%g'; 'r' corresponds to repr. |
974 | mode is one of '0', '2' or '3', and is completely determined by |
975 | format_code: 'e' and 'g' use mode 2; 'f' mode 3, 'r' mode 0. |
976 | precision is the desired precision |
977 | always_add_sign is nonzero if a '+' sign should be included for positive |
978 | numbers |
979 | add_dot_0_if_integer is nonzero if integers in non-exponential form |
980 | should have ".0" added. Only applies to format codes 'r' and 'g'. |
981 | use_alt_formatting is nonzero if alternative formatting should be |
982 | used. Only applies to format codes 'e', 'f' and 'g'. For code 'g', |
983 | at most one of use_alt_formatting and add_dot_0_if_integer should |
984 | be nonzero. |
985 | type, if non-NULL, will be set to one of these constants to identify |
986 | the type of the 'd' argument: |
987 | Py_DTST_FINITE |
988 | Py_DTST_INFINITE |
989 | Py_DTST_NAN |
990 | |
991 | Returns a PyMem_Malloc'd block of memory containing the resulting string, |
992 | or NULL on error. If NULL is returned, the Python error has been set. |
993 | */ |
994 | |
995 | static char * |
996 | format_float_short(double d, char format_code, |
997 | int mode, int precision, |
998 | int always_add_sign, int add_dot_0_if_integer, |
999 | int use_alt_formatting, const char * const *float_strings, |
1000 | int *type) |
1001 | { |
1002 | char *buf = NULL; |
1003 | char *p = NULL; |
1004 | Py_ssize_t bufsize = 0; |
1005 | char *digits, *digits_end; |
1006 | int decpt_as_int, sign, exp_len, exp = 0, use_exp = 0; |
1007 | Py_ssize_t decpt, digits_len, vdigits_start, vdigits_end; |
1008 | _Py_SET_53BIT_PRECISION_HEADER; |
1009 | |
1010 | /* _Py_dg_dtoa returns a digit string (no decimal point or exponent). |
1011 | Must be matched by a call to _Py_dg_freedtoa. */ |
1012 | _Py_SET_53BIT_PRECISION_START; |
1013 | digits = _Py_dg_dtoa(d, mode, precision, &decpt_as_int, &sign, |
1014 | &digits_end); |
1015 | _Py_SET_53BIT_PRECISION_END; |
1016 | |
1017 | decpt = (Py_ssize_t)decpt_as_int; |
1018 | if (digits == NULL) { |
1019 | /* The only failure mode is no memory. */ |
1020 | PyErr_NoMemory(); |
1021 | goto exit; |
1022 | } |
1023 | assert(digits_end != NULL && digits_end >= digits); |
1024 | digits_len = digits_end - digits; |
1025 | |
1026 | if (digits_len && !Py_ISDIGIT(digits[0])) { |
1027 | /* Infinities and nans here; adapt Gay's output, |
1028 | so convert Infinity to inf and NaN to nan, and |
1029 | ignore sign of nan. Then return. */ |
1030 | |
1031 | /* ignore the actual sign of a nan */ |
1032 | if (digits[0] == 'n' || digits[0] == 'N') |
1033 | sign = 0; |
1034 | |
1035 | /* We only need 5 bytes to hold the result "+inf\0" . */ |
1036 | bufsize = 5; /* Used later in an assert. */ |
1037 | buf = (char *)PyMem_Malloc(bufsize); |
1038 | if (buf == NULL) { |
1039 | PyErr_NoMemory(); |
1040 | goto exit; |
1041 | } |
1042 | p = buf; |
1043 | |
1044 | if (sign == 1) { |
1045 | *p++ = '-'; |
1046 | } |
1047 | else if (always_add_sign) { |
1048 | *p++ = '+'; |
1049 | } |
1050 | if (digits[0] == 'i' || digits[0] == 'I') { |
1051 | strncpy(p, float_strings[OFS_INF], 3); |
1052 | p += 3; |
1053 | |
1054 | if (type) |
1055 | *type = Py_DTST_INFINITE; |
1056 | } |
1057 | else if (digits[0] == 'n' || digits[0] == 'N') { |
1058 | strncpy(p, float_strings[OFS_NAN], 3); |
1059 | p += 3; |
1060 | |
1061 | if (type) |
1062 | *type = Py_DTST_NAN; |
1063 | } |
1064 | else { |
1065 | /* shouldn't get here: Gay's code should always return |
1066 | something starting with a digit, an 'I', or 'N' */ |
1067 | Py_UNREACHABLE(); |
1068 | } |
1069 | goto exit; |
1070 | } |
1071 | |
1072 | /* The result must be finite (not inf or nan). */ |
1073 | if (type) |
1074 | *type = Py_DTST_FINITE; |
1075 | |
1076 | |
1077 | /* We got digits back, format them. We may need to pad 'digits' |
1078 | either on the left or right (or both) with extra zeros, so in |
1079 | general the resulting string has the form |
1080 | |
1081 | [<sign>]<zeros><digits><zeros>[<exponent>] |
1082 | |
1083 | where either of the <zeros> pieces could be empty, and there's a |
1084 | decimal point that could appear either in <digits> or in the |
1085 | leading or trailing <zeros>. |
1086 | |
1087 | Imagine an infinite 'virtual' string vdigits, consisting of the |
1088 | string 'digits' (starting at index 0) padded on both the left and |
1089 | right with infinite strings of zeros. We want to output a slice |
1090 | |
1091 | vdigits[vdigits_start : vdigits_end] |
1092 | |
1093 | of this virtual string. Thus if vdigits_start < 0 then we'll end |
1094 | up producing some leading zeros; if vdigits_end > digits_len there |
1095 | will be trailing zeros in the output. The next section of code |
1096 | determines whether to use an exponent or not, figures out the |
1097 | position 'decpt' of the decimal point, and computes 'vdigits_start' |
1098 | and 'vdigits_end'. */ |
1099 | vdigits_end = digits_len; |
1100 | switch (format_code) { |
1101 | case 'e': |
1102 | use_exp = 1; |
1103 | vdigits_end = precision; |
1104 | break; |
1105 | case 'f': |
1106 | vdigits_end = decpt + precision; |
1107 | break; |
1108 | case 'g': |
1109 | if (decpt <= -4 || decpt > |
1110 | (add_dot_0_if_integer ? precision-1 : precision)) |
1111 | use_exp = 1; |
1112 | if (use_alt_formatting) |
1113 | vdigits_end = precision; |
1114 | break; |
1115 | case 'r': |
1116 | /* convert to exponential format at 1e16. We used to convert |
1117 | at 1e17, but that gives odd-looking results for some values |
1118 | when a 16-digit 'shortest' repr is padded with bogus zeros. |
1119 | For example, repr(2e16+8) would give 20000000000000010.0; |
1120 | the true value is 20000000000000008.0. */ |
1121 | if (decpt <= -4 || decpt > 16) |
1122 | use_exp = 1; |
1123 | break; |
1124 | default: |
1125 | PyErr_BadInternalCall(); |
1126 | goto exit; |
1127 | } |
1128 | |
1129 | /* if using an exponent, reset decimal point position to 1 and adjust |
1130 | exponent accordingly.*/ |
1131 | if (use_exp) { |
1132 | exp = (int)decpt - 1; |
1133 | decpt = 1; |
1134 | } |
1135 | /* ensure vdigits_start < decpt <= vdigits_end, or vdigits_start < |
1136 | decpt < vdigits_end if add_dot_0_if_integer and no exponent */ |
1137 | vdigits_start = decpt <= 0 ? decpt-1 : 0; |
1138 | if (!use_exp && add_dot_0_if_integer) |
1139 | vdigits_end = vdigits_end > decpt ? vdigits_end : decpt + 1; |
1140 | else |
1141 | vdigits_end = vdigits_end > decpt ? vdigits_end : decpt; |
1142 | |
1143 | /* double check inequalities */ |
1144 | assert(vdigits_start <= 0 && |
1145 | 0 <= digits_len && |
1146 | digits_len <= vdigits_end); |
1147 | /* decimal point should be in (vdigits_start, vdigits_end] */ |
1148 | assert(vdigits_start < decpt && decpt <= vdigits_end); |
1149 | |
1150 | /* Compute an upper bound how much memory we need. This might be a few |
1151 | chars too long, but no big deal. */ |
1152 | bufsize = |
1153 | /* sign, decimal point and trailing 0 byte */ |
1154 | 3 + |
1155 | |
1156 | /* total digit count (including zero padding on both sides) */ |
1157 | (vdigits_end - vdigits_start) + |
1158 | |
1159 | /* exponent "e+100", max 3 numerical digits */ |
1160 | (use_exp ? 5 : 0); |
1161 | |
1162 | /* Now allocate the memory and initialize p to point to the start of |
1163 | it. */ |
1164 | buf = (char *)PyMem_Malloc(bufsize); |
1165 | if (buf == NULL) { |
1166 | PyErr_NoMemory(); |
1167 | goto exit; |
1168 | } |
1169 | p = buf; |
1170 | |
1171 | /* Add a negative sign if negative, and a plus sign if non-negative |
1172 | and always_add_sign is true. */ |
1173 | if (sign == 1) |
1174 | *p++ = '-'; |
1175 | else if (always_add_sign) |
1176 | *p++ = '+'; |
1177 | |
1178 | /* note that exactly one of the three 'if' conditions is true, |
1179 | so we include exactly one decimal point */ |
1180 | /* Zero padding on left of digit string */ |
1181 | if (decpt <= 0) { |
1182 | memset(p, '0', decpt-vdigits_start); |
1183 | p += decpt - vdigits_start; |
1184 | *p++ = '.'; |
1185 | memset(p, '0', 0-decpt); |
1186 | p += 0-decpt; |
1187 | } |
1188 | else { |
1189 | memset(p, '0', 0-vdigits_start); |
1190 | p += 0 - vdigits_start; |
1191 | } |
1192 | |
1193 | /* Digits, with included decimal point */ |
1194 | if (0 < decpt && decpt <= digits_len) { |
1195 | strncpy(p, digits, decpt-0); |
1196 | p += decpt-0; |
1197 | *p++ = '.'; |
1198 | strncpy(p, digits+decpt, digits_len-decpt); |
1199 | p += digits_len-decpt; |
1200 | } |
1201 | else { |
1202 | strncpy(p, digits, digits_len); |
1203 | p += digits_len; |
1204 | } |
1205 | |
1206 | /* And zeros on the right */ |
1207 | if (digits_len < decpt) { |
1208 | memset(p, '0', decpt-digits_len); |
1209 | p += decpt-digits_len; |
1210 | *p++ = '.'; |
1211 | memset(p, '0', vdigits_end-decpt); |
1212 | p += vdigits_end-decpt; |
1213 | } |
1214 | else { |
1215 | memset(p, '0', vdigits_end-digits_len); |
1216 | p += vdigits_end-digits_len; |
1217 | } |
1218 | |
1219 | /* Delete a trailing decimal pt unless using alternative formatting. */ |
1220 | if (p[-1] == '.' && !use_alt_formatting) |
1221 | p--; |
1222 | |
1223 | /* Now that we've done zero padding, add an exponent if needed. */ |
1224 | if (use_exp) { |
1225 | *p++ = float_strings[OFS_E][0]; |
1226 | exp_len = sprintf(p, "%+.02d" , exp); |
1227 | p += exp_len; |
1228 | } |
1229 | exit: |
1230 | if (buf) { |
1231 | *p = '\0'; |
1232 | /* It's too late if this fails, as we've already stepped on |
1233 | memory that isn't ours. But it's an okay debugging test. */ |
1234 | assert(p-buf < bufsize); |
1235 | } |
1236 | if (digits) |
1237 | _Py_dg_freedtoa(digits); |
1238 | |
1239 | return buf; |
1240 | } |
1241 | |
1242 | |
1243 | char * PyOS_double_to_string(double val, |
1244 | char format_code, |
1245 | int precision, |
1246 | int flags, |
1247 | int *type) |
1248 | { |
1249 | const char * const *float_strings = lc_float_strings; |
1250 | int mode; |
1251 | |
1252 | /* Validate format_code, and map upper and lower case. Compute the |
1253 | mode and make any adjustments as needed. */ |
1254 | switch (format_code) { |
1255 | /* exponent */ |
1256 | case 'E': |
1257 | float_strings = uc_float_strings; |
1258 | format_code = 'e'; |
1259 | /* Fall through. */ |
1260 | case 'e': |
1261 | mode = 2; |
1262 | precision++; |
1263 | break; |
1264 | |
1265 | /* fixed */ |
1266 | case 'F': |
1267 | float_strings = uc_float_strings; |
1268 | format_code = 'f'; |
1269 | /* Fall through. */ |
1270 | case 'f': |
1271 | mode = 3; |
1272 | break; |
1273 | |
1274 | /* general */ |
1275 | case 'G': |
1276 | float_strings = uc_float_strings; |
1277 | format_code = 'g'; |
1278 | /* Fall through. */ |
1279 | case 'g': |
1280 | mode = 2; |
1281 | /* precision 0 makes no sense for 'g' format; interpret as 1 */ |
1282 | if (precision == 0) |
1283 | precision = 1; |
1284 | break; |
1285 | |
1286 | /* repr format */ |
1287 | case 'r': |
1288 | mode = 0; |
1289 | /* Supplied precision is unused, must be 0. */ |
1290 | if (precision != 0) { |
1291 | PyErr_BadInternalCall(); |
1292 | return NULL; |
1293 | } |
1294 | break; |
1295 | |
1296 | default: |
1297 | PyErr_BadInternalCall(); |
1298 | return NULL; |
1299 | } |
1300 | |
1301 | return format_float_short(val, format_code, mode, precision, |
1302 | flags & Py_DTSF_SIGN, |
1303 | flags & Py_DTSF_ADD_DOT_0, |
1304 | flags & Py_DTSF_ALT, |
1305 | float_strings, type); |
1306 | } |
1307 | #endif /* ifdef PY_NO_SHORT_FLOAT_REPR */ |
1308 | |