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111
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1 /* PR tree-optimization/77671 - missing -Wformat-overflow warning
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2 on sprintf overflow with "%s"
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3
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4 Negative test verifying that sprintf family calls that must not
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5 be transformed into calls to other functions (such as memcpy)
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6 are preserved.
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7
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8 { dg-compile }
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9 { dg-options "-O2 -Wformat -Wno-format-truncation -Wno-format-zero-length -fdump-tree-optimized" } */
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10
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11 void sink (char*, ...);
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12
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13 extern char buffer[];
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14
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15 /* String exactly 4100 characters long (plus the terminating NUL). */
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16 extern const char s4100[4101];
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17
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18 void test_sprintf (const char *s)
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19 {
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20 /* Macros to test the function call while eignoring and using
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21 the return value, respectively. */
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22 #define IGN(...) __builtin_sprintf (buffer, __VA_ARGS__), sink (buffer)
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23 #define USE(...) sink (buffer, __builtin_sprintf (buffer, __VA_ARGS__))
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24
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25 /* All of the following calls to sprintf must be emitted (and not
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26 transformed into memcpy, strcpy, or similar). */
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27
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28 /* Verify that a sprintf call with output in excess of the maximum
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29 of 4095 bytes is not transformed into memcpy/strcpy when its
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30 return value is used (the call may fail with EOVERFLOW but
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31 the error is only detectable when the function's negative return
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32 value indicates errno is valid ). */
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33 USE (s4100);
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34
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35 USE ("%s", s4100);
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36
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37 /* Same as above but with string of unknown length (which could
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38 be in excess of 4K long). */
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39 USE (s);
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40 USE ("%s", s);
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41 }
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42
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43
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44 void test_snprintf (void)
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45 {
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46 #undef IGN
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47 #define IGN(N, ...) __builtin_snprintf (buffer, N, __VA_ARGS__); sink (buffer)
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48
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49 /* All of the following calls to sprintf must be emitted (and not
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50 transformed into memcpy, strcpy, or similar). */
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51
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52 /* Truncated output could be optimized into strncpy (not done yet). */
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53 IGN (1, "123");
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54 IGN (1, s4100);
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55
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56 IGN (1, "%s", "123");
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57 IGN (1, "%s", s4100);
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58
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59 /* Output in excess of the maximum of 4095 bytes. */
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60 IGN (4097, s4100);
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61
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62 IGN (4097, "%s", s4100);
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63 }
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64
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65
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66 void test_vsprintf (__builtin_va_list va)
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67 {
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68 #undef IGN
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69 #define IGN(fmt) __builtin_vsprintf (buffer, fmt, va); sink (buffer)
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70
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71 /* All of the following calls to vsprintf must be emitted (and not
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72 transformed into memcpy, strcpy, or similar). */
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73
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74 /* Output in excess of the maximum of 4095 bytes. */
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75 IGN (s4100);
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76 }
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77
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78
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79 void test_vsnprintf (__builtin_va_list va)
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80 {
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81 #undef IGN
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82 #define IGN(N, fmt) __builtin_vsnprintf (buffer, N, fmt, va); sink (buffer)
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83
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84 /* All of the following calls to vsnprintf must be emitted (and not
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85 transformed into memcpy, strcpy, or similar). */
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86
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87 /* Truncated output could be optimized into strncpy (not done yet). */
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88 IGN (1, "123");
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89 IGN (1, s4100);
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90
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91 /* Output in excess of the maximum of 4095 bytes. */
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92 IGN (4097, s4100);
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93 }
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94
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95 /* { dg-final { scan-tree-dump-times "builtin_sprintf" 4 "optimized" } }
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96 { dg-final { scan-tree-dump-times "builtin_snprintf" 6 "optimized" } }
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97 { dg-final { scan-tree-dump-times "builtin_vsprintf" 1 "optimized" } }
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98 { dg-final { scan-tree-dump-times "builtin_vsnprintf" 3 "optimized" } } */
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99
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100 #define S10 "0123456789"
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101 #define S100 S10 S10 S10 S10 S10 S10 S10 S10 S10 S10
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102 #define S1000 S100 S100 S100 S100 S100 S100 S100 S100 S100 S100
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103
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104 const char s4100[4101] = S1000 S1000 S1000 S1000 S100;
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