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annotate Python/mysnprintf.c @ 56894:b085fd0611de 3.1

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Merged revisions 75797 via svnmerge from svn+ssh://svn.python.org/python/branches/py3k ................ r75797 | georg.brandl | 2009-10-27 16:28:25 +0100 (Di, 27 Okt 2009) | 129 lines Merged revisions 75365,75394,75402-75403,75418,75459,75484,75592-75596,75600,75602-75607,75610-75613,75616-75617,75623,75627,75640,75647,75696,75795 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r75365 | georg.brandl | 2009-10-11 22:16:16 +0200 (So, 11 Okt 2009) | 1 line Fix broken links found by "make linkcheck". scipy.org seems to be done right now, so I could not verify links going there. ........ r75394 | georg.brandl | 2009-10-13 20:10:59 +0200 (Di, 13 Okt 2009) | 1 line Fix markup. ........ r75402 | georg.brandl | 2009-10-14 17:51:48 +0200 (Mi, 14 Okt 2009) | 1 line #7125: fix typo. ........ r75403 | georg.brandl | 2009-10-14 17:57:46 +0200 (Mi, 14 Okt 2009) | 1 line #7126: os.environ changes *do* take effect in subprocesses started with os.system(). ........ r75418 | georg.brandl | 2009-10-14 20:48:32 +0200 (Mi, 14 Okt 2009) | 1 line #7116: str.join() takes an iterable. ........ r75459 | georg.brandl | 2009-10-17 10:57:43 +0200 (Sa, 17 Okt 2009) | 1 line Fix refleaks in _ctypes PyCSimpleType_New, which fixes the refleak seen in test___all__. ........ r75484 | georg.brandl | 2009-10-18 09:58:12 +0200 (So, 18 Okt 2009) | 1 line Fix missing word. ........ r75592 | georg.brandl | 2009-10-22 09:05:48 +0200 (Do, 22 Okt 2009) | 1 line Fix punctuation. ........ r75593 | georg.brandl | 2009-10-22 09:06:49 +0200 (Do, 22 Okt 2009) | 1 line Revert unintended change. ........ r75594 | georg.brandl | 2009-10-22 09:56:02 +0200 (Do, 22 Okt 2009) | 1 line Fix markup. ........ r75595 | georg.brandl | 2009-10-22 09:56:56 +0200 (Do, 22 Okt 2009) | 1 line Fix duplicate target. ........ r75596 | georg.brandl | 2009-10-22 10:05:04 +0200 (Do, 22 Okt 2009) | 1 line Add a new directive marking up implementation details and start using it. ........ r75600 | georg.brandl | 2009-10-22 13:01:46 +0200 (Do, 22 Okt 2009) | 1 line Make it more robust. ........ r75602 | georg.brandl | 2009-10-22 13:28:06 +0200 (Do, 22 Okt 2009) | 1 line Document new directive. ........ r75603 | georg.brandl | 2009-10-22 13:28:23 +0200 (Do, 22 Okt 2009) | 1 line Allow short form with text as argument. ........ r75604 | georg.brandl | 2009-10-22 13:36:50 +0200 (Do, 22 Okt 2009) | 1 line Fix stylesheet for multi-paragraph impl-details. ........ r75605 | georg.brandl | 2009-10-22 13:48:10 +0200 (Do, 22 Okt 2009) | 1 line Use "impl-detail" directive where applicable. ........ r75606 | georg.brandl | 2009-10-22 17:00:06 +0200 (Do, 22 Okt 2009) | 1 line #6324: membership test tries iteration via __iter__. ........ r75607 | georg.brandl | 2009-10-22 17:04:09 +0200 (Do, 22 Okt 2009) | 1 line #7088: document new functions in signal as Unix-only. ........ r75610 | georg.brandl | 2009-10-22 17:27:24 +0200 (Do, 22 Okt 2009) | 1 line Reorder __slots__ fine print and add a clarification. ........ r75611 | georg.brandl | 2009-10-22 17:42:32 +0200 (Do, 22 Okt 2009) | 1 line #7035: improve docs of the various <method>_errors() functions, and give them docstrings. ........ r75612 | georg.brandl | 2009-10-22 17:52:15 +0200 (Do, 22 Okt 2009) | 1 line #7156: document curses as Unix-only. ........ r75613 | georg.brandl | 2009-10-22 17:54:35 +0200 (Do, 22 Okt 2009) | 1 line #6977: getopt does not support optional option arguments. ........ r75616 | georg.brandl | 2009-10-22 18:17:05 +0200 (Do, 22 Okt 2009) | 1 line Add proper references. ........ r75617 | georg.brandl | 2009-10-22 18:20:55 +0200 (Do, 22 Okt 2009) | 1 line Make printout margin important. ........ r75623 | georg.brandl | 2009-10-23 10:14:44 +0200 (Fr, 23 Okt 2009) | 1 line #7188: fix optionxform() docs. ........ r75627 | fred.drake | 2009-10-23 15:04:51 +0200 (Fr, 23 Okt 2009) | 2 lines add further note about what's passed to optionxform ........ r75640 | neil.schemenauer | 2009-10-23 21:58:17 +0200 (Fr, 23 Okt 2009) | 2 lines Improve some docstrings in the 'warnings' module. ........ r75647 | georg.brandl | 2009-10-24 12:04:19 +0200 (Sa, 24 Okt 2009) | 1 line Fix markup. ........ r75696 | georg.brandl | 2009-10-25 21:25:43 +0100 (So, 25 Okt 2009) | 1 line Fix a demo. ........ r75795 | georg.brandl | 2009-10-27 16:10:22 +0100 (Di, 27 Okt 2009) | 1 line Fix a strange mis-edit. ........ ................
author Georg Brandl <georg@python.org>
date Tue, 27 Oct 2009 20:24:45 +0000
parents ae5f5156b882
children cab14be0ada1
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1 #include "Python.h"
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2
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3 /* snprintf() wrappers. If the platform has vsnprintf, we use it, else we
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4 emulate it in a half-hearted way. Even if the platform has it, we wrap
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5 it because platforms differ in what vsnprintf does in case the buffer
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6 is too small: C99 behavior is to return the number of characters that
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7 would have been written had the buffer not been too small, and to set
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8 the last byte of the buffer to \0. At least MS _vsnprintf returns a
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9 negative value instead, and fills the entire buffer with non-\0 data.
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10
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11 The wrappers ensure that str[size-1] is always \0 upon return.
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12
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13 PyOS_snprintf and PyOS_vsnprintf never write more than size bytes
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14 (including the trailing '\0') into str.
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15
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16 If the platform doesn't have vsnprintf, and the buffer size needed to
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17 avoid truncation exceeds size by more than 512, Python aborts with a
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18 Py_FatalError.
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19
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20 Return value (rv):
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21
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22 When 0 <= rv < size, the output conversion was unexceptional, and
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23 rv characters were written to str (excluding a trailing \0 byte at
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24 str[rv]).
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25
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26 When rv >= size, output conversion was truncated, and a buffer of
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27 size rv+1 would have been needed to avoid truncation. str[size-1]
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28 is \0 in this case.
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29
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30 When rv < 0, "something bad happened". str[size-1] is \0 in this
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31 case too, but the rest of str is unreliable. It could be that
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32 an error in format codes was detected by libc, or on platforms
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33 with a non-C99 vsnprintf simply that the buffer wasn't big enough
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34 to avoid truncation, or on platforms without any vsnprintf that
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35 PyMem_Malloc couldn't obtain space for a temp buffer.
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36
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37 CAUTION: Unlike C99, str != NULL and size > 0 are required.
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38 */
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39
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40 int
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41 PyOS_snprintf(char *str, size_t size, const char *format, ...)
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42 {
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43 int rc;
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44 va_list va;
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45
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46 va_start(va, format);
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47 rc = PyOS_vsnprintf(str, size, format, va);
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48 va_end(va);
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49 return rc;
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50 }
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51
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52 int
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53 PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va)
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54 {
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55 int len; /* # bytes written, excluding \0 */
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56 #ifdef HAVE_SNPRINTF
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57 #define _PyOS_vsnprintf_EXTRA_SPACE 1
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58 #else
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59 #define _PyOS_vsnprintf_EXTRA_SPACE 512
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60 char *buffer;
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61 #endif
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62 assert(str != NULL);
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63 assert(size > 0);
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64 assert(format != NULL);
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65 /* We take a size_t as input but return an int. Sanity check
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66 * our input so that it won't cause an overflow in the
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67 * vsnprintf return value or the buffer malloc size. */
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68 if (size > INT_MAX - _PyOS_vsnprintf_EXTRA_SPACE) {
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69 len = -666;
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70 goto Done;
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71 }
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72
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73 #ifdef HAVE_SNPRINTF
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74 len = vsnprintf(str, size, format, va);
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75 #else
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76 /* Emulate it. */
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77 buffer = PyMem_MALLOC(size + _PyOS_vsnprintf_EXTRA_SPACE);
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78 if (buffer == NULL) {
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79 len = -666;
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80 goto Done;
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81 }
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82
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83 len = vsprintf(buffer, format, va);
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84 if (len < 0)
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85 /* ignore the error */;
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86
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87 else if ((size_t)len >= size + _PyOS_vsnprintf_EXTRA_SPACE)
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88 Py_FatalError("Buffer overflow in PyOS_snprintf/PyOS_vsnprintf");
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89
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90 else {
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91 const size_t to_copy = (size_t)len < size ?
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92 (size_t)len : size - 1;
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93 assert(to_copy < size);
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94 memcpy(str, buffer, to_copy);
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95 str[to_copy] = '\0';
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96 }
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97 PyMem_FREE(buffer);
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98 #endif
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99 Done:
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100 if (size > 0)
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101 str[size-1] = '\0';
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102 return len;
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103 #undef _PyOS_vsnprintf_EXTRA_SPACE
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104 }