Mercurial > cpython-lru_cache-weakref

annotate Python/mysnprintf.c @ 20915:23a209484f02 legacy-trunk

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Backing out the fast path for interned string compares again as requested.
author Marc-André Lemburg <mal@egenix.com>
date Thu, 08 Nov 2001 08:34:43 +0000
parents 2bc648932d44
children 6b6a9cae256e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 #include "Python.h"
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3
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4 /* snprintf() emulation for platforms which don't have it (yet).
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5
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6 Return value
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7
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8 The number of characters printed (not including the trailing
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9 `\0' used to end output to strings) or a negative number in
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10 case of an error.
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11
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12 PyOS_snprintf and PyOS_vsnprintf do not write more than size
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13 bytes (including the trailing '\0').
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14
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15 If the output would have been truncated, they return the number
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16 of characters (excluding the trailing '\0') which would have
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17 been written to the final string if enough space had been
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18 available. This is inline with the C99 standard.
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19
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20 */
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21
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22 #include <ctype.h>
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23
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24 #ifndef HAVE_SNPRINTF
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25
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26 static
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27 int myvsnprintf(char *str, size_t size, const char *format, va_list va)
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28 {
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29 char *buffer = PyMem_Malloc(size + 512);
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30 int len;
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31
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32 if (buffer == NULL)
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33 return -1;
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34 len = vsprintf(buffer, format, va);
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35 if (len < 0) {
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36 PyMem_Free(buffer);
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37 return len;
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38 }
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39 len++;
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40 assert(len >= 0);
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41 if ((size_t)len > size + 512)
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42 Py_FatalError("Buffer overflow in PyOS_snprintf/PyOS_vsnprintf");
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43 if ((size_t)len > size) {
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44 PyMem_Free(buffer);
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45 return len - 1;
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46 }
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47 memcpy(str, buffer, len);
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48 PyMem_Free(buffer);
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49 return len - 1;
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50 }
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51
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52 int PyOS_snprintf(char *str, size_t size, const char *format, ...)
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53 {
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54 int rc;
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55 va_list va;
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56
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57 va_start(va, format);
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58 rc = myvsnprintf(str, size, format, va);
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59 va_end(va);
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60 return rc;
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61 }
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62
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63 int PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va)
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64 {
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65 return myvsnprintf(str, size, format, va);
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66 }
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67
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68 #else
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69
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70 /* Make sure that a C API is included in the lib */
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71
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72 #ifdef PyOS_snprintf
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73 # undef PyOS_snprintf
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74 #endif
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75
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76 int PyOS_snprintf(char *str, size_t size, const char *format, ...)
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77 {
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78 int rc;
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79 va_list va;
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80
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81 va_start(va, format);
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82 rc = vsnprintf(str, size, format, va);
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83 va_end(va);
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84 return rc;
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85 }
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86
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87 #ifdef PyOS_vsnprintf
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88 # undef PyOS_vsnprintf
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89 #endif
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90
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91 int PyOS_vsnprintf(char *str, size_t size, const char *format, va_list va)
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92 {
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93 return vsnprintf(str, size, format, va);
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94 }
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95
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96 #endif
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97