Mercurial > cpython-lru_cache-weakref
annotate Python/mysnprintf.c @ 44349:4dc01402d78a
Merged revisions 59541-59561 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
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r59544 | raymond.hettinger | 2007-12-18 01:13:45 +0100 (Tue, 18 Dec 2007) | 1 line
Add more namedtuple() test cases. Neaten the code and comments.
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r59545 | christian.heimes | 2007-12-18 04:38:03 +0100 (Tue, 18 Dec 2007) | 3 lines
Fixed for #1601: IDLE not working correctly on Windows (Py30a2/IDLE30a1)
Amaury's ideas works great. Should we build the Python core with WINVER=0x0500 and _WIN32_WINNT=0x0500, too?
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r59546 | christian.heimes | 2007-12-18 10:00:13 +0100 (Tue, 18 Dec 2007) | 1 line
Make it a bit easier to test Tcl/Tk and idle from a build dir.
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r59547 | christian.heimes | 2007-12-18 10:12:10 +0100 (Tue, 18 Dec 2007) | 1 line
Removed several unused files from the PCbuild9 directory. They are relics from the past.
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r59548 | raymond.hettinger | 2007-12-18 19:26:18 +0100 (Tue, 18 Dec 2007) | 29 lines
Speed-up dictionary constructor by about 10%.
New opcode, STORE_MAP saves the compiler from awkward stack manipulations
and specializes for dicts using PyDict_SetItem instead of PyObject_SetItem.
Old disassembly:
0 BUILD_MAP 0
3 DUP_TOP
4 LOAD_CONST 1 (1)
7 ROT_TWO
8 LOAD_CONST 2 ('x')
11 STORE_SUBSCR
12 DUP_TOP
13 LOAD_CONST 3 (2)
16 ROT_TWO
17 LOAD_CONST 4 ('y')
20 STORE_SUBSCR
New disassembly:
0 BUILD_MAP 0
3 LOAD_CONST 1 (1)
6 LOAD_CONST 2 ('x')
9 STORE_MAP
10 LOAD_CONST 3 (2)
13 LOAD_CONST 4 ('y')
16 STORE_MAP
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r59549 | thomas.heller | 2007-12-18 20:00:34 +0100 (Tue, 18 Dec 2007) | 2 lines
Issue #1642: Fix segfault in ctypes when trying to delete attributes.
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r59551 | guido.van.rossum | 2007-12-18 21:10:42 +0100 (Tue, 18 Dec 2007) | 2 lines
Issue #1645 by Alberto Bertogli. Fix a comment.
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r59553 | raymond.hettinger | 2007-12-18 22:24:09 +0100 (Tue, 18 Dec 2007) | 12 lines
Give meaning to the oparg for BUILD_MAP: estimated size of the dictionary.
Allows dictionaries to be pre-sized (upto 255 elements) saving time lost
to re-sizes with their attendant mallocs and re-insertions.
Has zero effect on small dictionaries (5 elements or fewer), a slight
benefit for dicts upto 22 elements (because they had to resize once
anyway), and more benefit for dicts upto 255 elements (saving multiple
resizes during the build-up and reducing the number of collisions on
the first insertions). Beyond 255 elements, there is no addional benefit.
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r59554 | christian.heimes | 2007-12-18 22:56:09 +0100 (Tue, 18 Dec 2007) | 1 line
Fixed #1649: IDLE error: dictionary changed size during iteration
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r59557 | raymond.hettinger | 2007-12-18 23:21:27 +0100 (Tue, 18 Dec 2007) | 1 line
Simplify and speedup _asdict() for named tuples.
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r59558 | christian.heimes | 2007-12-19 00:22:54 +0100 (Wed, 19 Dec 2007) | 3 lines
Applied patch #1635: Float patch for inf and nan on Windows (and other platforms).
The patch unifies float("inf") and repr(float("inf")) on all platforms.
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r59559 | raymond.hettinger | 2007-12-19 00:51:15 +0100 (Wed, 19 Dec 2007) | 1 line
Users demand iterable input for named tuples. The author capitulates.
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r59560 | raymond.hettinger | 2007-12-19 01:21:06 +0100 (Wed, 19 Dec 2007) | 1 line
Beef-up tests for dict literals
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r59561 | raymond.hettinger | 2007-12-19 01:27:21 +0100 (Wed, 19 Dec 2007) | 1 line
Zap a duplicate line
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| author | Christian Heimes <christian@cheimes.de> |
|---|---|
| date | Wed, 19 Dec 2007 02:07:34 +0000 |
| parents | 8af86a952b2c |
| children | 2925b568aacc a8cc8e6f0c1a |
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1 #include "Python.h" |
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2 #include <ctype.h> |
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3 |
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4 /* snprintf() wrappers. If the platform has vsnprintf, we use it, else we |
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5 emulate it in a half-hearted way. Even if the platform has it, we wrap |
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6 it because platforms differ in what vsnprintf does in case the buffer |
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7 is too small: C99 behavior is to return the number of characters that |
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8 would have been written had the buffer not been too small, and to set |
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9 the last byte of the buffer to \0. At least MS _vsnprintf returns a |
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10 negative value instead, and fills the entire buffer with non-\0 data. |
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11 |
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12 The wrappers ensure that str[size-1] is always \0 upon return. |
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13 |
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14 PyOS_snprintf and PyOS_vsnprintf never write more than size bytes |
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15 (including the trailing '\0') into str. |
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16 |
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17 If the platform doesn't have vsnprintf, and the buffer size needed to |
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18 avoid truncation exceeds size by more than 512, Python aborts with a |
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19 Py_FatalError. |
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20 |
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21 Return value (rv): |
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22 |
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23 When 0 <= rv < size, the output conversion was unexceptional, and |
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24 rv characters were written to str (excluding a trailing \0 byte at |
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25 str[rv]). |
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26 |
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27 When rv >= size, output conversion was truncated, and a buffer of |
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28 size rv+1 would have been needed to avoid truncation. str[size-1] |
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29 is \0 in this case. |
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30 |
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31 When rv < 0, "something bad happened". str[size-1] is \0 in this |
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32 case too, but the rest of str is unreliable. It could be that |
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33 an error in format codes was detected by libc, or on platforms |
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34 with a non-C99 vsnprintf simply that the buffer wasn't big enough |
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35 to avoid truncation, or on platforms without any vsnprintf that |
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36 PyMem_Malloc couldn't obtain space for a temp buffer. |
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37 |
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38 CAUTION: Unlike C99, str != NULL and size > 0 are required. |
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39 */ |
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40 |
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41 int |
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42 PyOS_snprintf(char *str, size_t size, const char *format, ...) |
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43 { |
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44 int rc; |
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45 va_list va; |
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46 |
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47 va_start(va, format); |
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48 rc = PyOS_vsnprintf(str, size, format, va); |
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49 va_end(va); |
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50 return rc; |
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51 } |
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52 |
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53 int |
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54 PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va) |
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55 { |
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56 int len; /* # bytes written, excluding \0 */ |
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57 #ifndef HAVE_SNPRINTF |
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58 char *buffer; |
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59 #endif |
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60 assert(str != NULL); |
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61 assert(size > 0); |
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62 assert(format != NULL); |
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63 |
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64 #ifdef HAVE_SNPRINTF |
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65 len = vsnprintf(str, size, format, va); |
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66 #else |
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67 /* Emulate it. */ |
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68 buffer = PyMem_MALLOC(size + 512); |
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69 if (buffer == NULL) { |
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70 len = -666; |
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71 goto Done; |
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72 } |
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73 |
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74 len = vsprintf(buffer, format, va); |
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75 if (len < 0) |
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76 /* ignore the error */; |
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77 |
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78 else if ((size_t)len >= size + 512) |
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79 Py_FatalError("Buffer overflow in PyOS_snprintf/PyOS_vsnprintf"); |
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80 |
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81 else { |
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82 const size_t to_copy = (size_t)len < size ? |
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83 (size_t)len : size - 1; |
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84 assert(to_copy < size); |
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85 memcpy(str, buffer, to_copy); |
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86 str[to_copy] = '\0'; |
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87 } |
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PyOS_vsnprintf(): Change PyMem_Malloc() call to PyMem_MALLOC() macro,
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88 PyMem_FREE(buffer); |
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89 Done: |
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90 #endif |
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91 str[size-1] = '\0'; |
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92 return len; |
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This patch turns the Python API mismatch notice into a standard
Marc-André Lemburg <mal@egenix.com>
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93 } |
