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annotate Python/mysnprintf.c @ 44885:fefaa0e66fdd

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Merged revisions 60176-60209 via svnmerge from svn+ssh://pythondev@svn.python.org/python/trunk ........ r60178 | georg.brandl | 2008-01-21 22:05:49 +0100 (Mon, 21 Jan 2008) | 2 lines #1715: include sub-extension modules in pydoc text output. ........ r60179 | georg.brandl | 2008-01-21 22:14:21 +0100 (Mon, 21 Jan 2008) | 2 lines Add a "const" to make gcc happy. ........ r60180 | georg.brandl | 2008-01-21 22:19:07 +0100 (Mon, 21 Jan 2008) | 2 lines Add the correct build dir when building with pydebug. ........ r60181 | georg.brandl | 2008-01-21 22:23:15 +0100 (Mon, 21 Jan 2008) | 3 lines Patch #1720595: add T_BOOL to the range of structmember types. Patch by Angelo Mottola, reviewed by MvL, tests by me. ........ r60182 | georg.brandl | 2008-01-21 22:28:32 +0100 (Mon, 21 Jan 2008) | 2 lines Reformat some ugly code. ........ r60187 | brett.cannon | 2008-01-22 00:50:16 +0100 (Tue, 22 Jan 2008) | 4 lines Make's MAKEFLAGS variable is set to a string containing the single-letter arguments to Make. This means there are no hyphens. Fix the '-s' check to silence distutils to now work. ........ r60188 | gregory.p.smith | 2008-01-22 01:19:41 +0100 (Tue, 22 Jan 2008) | 3 lines accepts and closes issue #1221598: adds an optional callback to ftplib.FTP storbinary() and storlines() methods. ........ r60189 | gregory.p.smith | 2008-01-22 02:12:02 +0100 (Tue, 22 Jan 2008) | 2 lines Replace spam.acquire() try: ... finally: spam.release() with "with spam:" ........ r60190 | gregory.p.smith | 2008-01-22 02:20:42 +0100 (Tue, 22 Jan 2008) | 4 lines - Fix Issue #1703448: A joined thread could show up in the threading.enumerate() list after the join() for a brief period until it actually exited. ........ r60193 | georg.brandl | 2008-01-22 08:53:31 +0100 (Tue, 22 Jan 2008) | 2 lines Fix \xhh specs, #1889. ........ r60198 | christian.heimes | 2008-01-22 16:01:25 +0100 (Tue, 22 Jan 2008) | 1 line Fixed a missing (X) in define ........ r60199 | christian.heimes | 2008-01-22 16:25:18 +0100 (Tue, 22 Jan 2008) | 2 lines Don't repeat yourself Added the macros PyModule_AddIntMacro and PyModule_AddStringMacro. They shorten PyModule_AddIntConstant(m, "AF_INET", AF_INET) to PyModule_AddIntMacro(m, AF_INET) ........ r60201 | raymond.hettinger | 2008-01-22 20:51:41 +0100 (Tue, 22 Jan 2008) | 1 line Document when to use izip_longest(). ........ r60202 | georg.brandl | 2008-01-22 20:56:03 +0100 (Tue, 22 Jan 2008) | 2 lines Fix for #1087741 patch. ........ r60203 | raymond.hettinger | 2008-01-22 21:18:53 +0100 (Tue, 22 Jan 2008) | 1 line Give zip() the same guarantee as izip() for left-to-right evaluation. ........ r60204 | raymond.hettinger | 2008-01-22 23:09:26 +0100 (Tue, 22 Jan 2008) | 1 line Improve variable name in sample code ........ r60205 | gregory.p.smith | 2008-01-23 00:15:34 +0100 (Wed, 23 Jan 2008) | 2 lines docstring and comment updates suggested by Giampaolo Rodola' ........ r60207 | raymond.hettinger | 2008-01-23 01:04:40 +0100 (Wed, 23 Jan 2008) | 1 line Let pprint() support sets and frozensets (suggested by David Mertz). ........ r60208 | guido.van.rossum | 2008-01-23 02:18:27 +0100 (Wed, 23 Jan 2008) | 4 lines I'm tired of these tests breaking at Google due to our large number of users and groups in LDAP/NIS. So I'm limiting the extra-heavy part of the tests to passwd/group files with at most 1000 entries. ........
author Christian Heimes <christian@cheimes.de>
date Wed, 23 Jan 2008 08:24:23 +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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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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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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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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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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93 }