Mercurial > cpython-lru_cache-weakref

annotate Python/mysnprintf.c @ 48474:2ee09afee126

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implement chained exception tracebacks patch from Antoine Pitrou #3112
author Benjamin Peterson <benjamin@python.org>
date Tue, 15 Jul 2008 15:32:09 +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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73
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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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102 str[size-1] = '\0';
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103 return len;
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104 #undef _PyOS_vsnprintf_EXTRA_SPACE
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105 }