Mercurial > cpython-lru_cache-weakref

annotate Python/mysnprintf.c @ 49633:bd0e9a9cd283

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Merged revisions 67028,67040,67044,67046,67052,67065,67070,67077,67082 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r67028 | benjamin.peterson | 2008-10-25 18:27:07 -0500 (Sat, 25 Oct 2008) | 1 line don't use a catch-all ........ r67040 | armin.rigo | 2008-10-28 12:01:21 -0500 (Tue, 28 Oct 2008) | 5 lines Fix one of the tests: it relied on being present in an "output test" in order to actually test what it was supposed to test, i.e. that the code in the __del__ method did not crash. Use instead the new helper test_support.captured_output(). ........ r67044 | amaury.forgeotdarc | 2008-10-29 18:15:57 -0500 (Wed, 29 Oct 2008) | 3 lines Correct error message in io.open(): closefd=True is the only accepted value with a file name. ........ r67046 | thomas.heller | 2008-10-30 15:18:13 -0500 (Thu, 30 Oct 2008) | 2 lines Fixed a modulefinder crash on certain relative imports. ........ r67052 | christian.heimes | 2008-10-30 16:26:15 -0500 (Thu, 30 Oct 2008) | 1 line Issue #4237: io.FileIO() was raising invalid warnings caused by insufficient initialization of PyFileIOObject struct members. ........ r67065 | benjamin.peterson | 2008-10-30 18:59:18 -0500 (Thu, 30 Oct 2008) | 1 line move unprefixed error into .c file ........ r67070 | benjamin.peterson | 2008-10-31 15:41:44 -0500 (Fri, 31 Oct 2008) | 1 line rephrase has_key doc ........ r67077 | benjamin.peterson | 2008-11-03 09:14:51 -0600 (Mon, 03 Nov 2008) | 1 line #4048 make the parser module accept relative imports as valid ........ r67082 | hirokazu.yamamoto | 2008-11-03 12:03:06 -0600 (Mon, 03 Nov 2008) | 2 lines Issue #3774: Fixed an error when create a Tkinter menu item without command and then remove it. Written by Guilherme Polo (gpolo). ........
author Benjamin Peterson <benjamin@python.org>
date Mon, 03 Nov 2008 20:31:38 +0000
parents 2925b568aacc
children ae5f5156b882 787b969d37f0
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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 #ifdef HAVE_SNPRINTF
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58 #define _PyOS_vsnprintf_EXTRA_SPACE 1
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59 #else
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60 #define _PyOS_vsnprintf_EXTRA_SPACE 512
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61 char *buffer;
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62 #endif
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63 assert(str != NULL);
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64 assert(size > 0);
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65 assert(format != NULL);
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66 /* We take a size_t as input but return an int. Sanity check
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67 * our input so that it won't cause an overflow in the
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68 * vsnprintf return value or the buffer malloc size. */
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69 if (size > INT_MAX - _PyOS_vsnprintf_EXTRA_SPACE) {
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70 len = -666;
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71 goto Done;
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72 }
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74 #ifdef HAVE_SNPRINTF
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75 len = vsnprintf(str, size, format, va);
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76 #else
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77 /* Emulate it. */
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78 buffer = PyMem_MALLOC(size + _PyOS_vsnprintf_EXTRA_SPACE);
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79 if (buffer == NULL) {
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80 len = -666;
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81 goto Done;
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82 }
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83
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84 len = vsprintf(buffer, format, va);
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85 if (len < 0)
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86 /* ignore the error */;
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87
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88 else if ((size_t)len >= size + _PyOS_vsnprintf_EXTRA_SPACE)
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89 Py_FatalError("Buffer overflow in PyOS_snprintf/PyOS_vsnprintf");
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90
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91 else {
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92 const size_t to_copy = (size_t)len < size ?
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93 (size_t)len : size - 1;
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94 assert(to_copy < size);
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95 memcpy(str, buffer, to_copy);
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96 str[to_copy] = '\0';
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97 }
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98 PyMem_FREE(buffer);
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99 #endif
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100 Done:
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101 if (size > 0)
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parents: 21518
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102 str[size-1] = '\0';
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87fa6e9bd77e mysnprintf.c: Massive rewrite of PyOS_snprintf and PyOS_vsnprintf, to
Tim Peters <tim.peters@gmail.com>
parents: 21126
diff changeset
103 return len;
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2925b568aacc Merged revisions 63562,63570,63728,63734,63784,63788,63802,63817,63827,63839,63887,63975,63998 via svnmerge from
Georg Brandl <georg@python.org>
parents: 21518
diff changeset
104 #undef _PyOS_vsnprintf_EXTRA_SPACE
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79c676f9b34a This patch turns the Python API mismatch notice into a standard
Marc-André Lemburg <mal@egenix.com>
parents:
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105 }