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131
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1 /* PR tree-optimization/86552 - missing warning for reading past the end
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2 of non-string arrays
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3 Exercise non-string detection in sprintf.
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4 { dg-do compile }
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5 { dg-options "-O2 -Wno-array-bounds -Wall -ftrack-macro-expansion=0" } */
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6
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7 #include "range.h"
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8
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9 typedef __WCHAR_TYPE__ wchar_t;
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10
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11 extern int sprintf (char*, const char*, ...);
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12
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13 extern char *dst;
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14
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15 int i0 = 0;
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16 int i1 = 1;
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17
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18 void sink (int, ...);
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19
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20 #define CONCAT(a, b) a ## b
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21 #define CAT(a, b) CONCAT(a, b)
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22
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23 #define T(fmt, ...) \
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24 sink (sprintf (dst, fmt, __VA_ARGS__))
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25
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26 const char a[5] = "12345"; /* { dg-message "declared here" } */
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27 const char b[6] = "123456"; /* { dg-message "declared here" } */
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28 const char a2[][3] = {
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145
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29 "", "1", "12", "123", "123\000" /* { dg-warning "initializer-string for array of 'char' is too long" } */
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131
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30 };
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31
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32
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33 void test_narrow (void)
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34 {
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35 /* Verify that precision suppresses the warning when it's less
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36 than the size of the array. */
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37 T ("%.0s%.1s%.2s%.3s%.4s%.5s", a, a, a, a, a, a);
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38
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39 T ("%s", a); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
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40 T ("%.6s", a); /* { dg-warning ".%.6s. directive argument is not a nul-terminated string" } */
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41
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42 /* Exercise conditional expressions involving strings and non-strings. */
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43 const char *s0 = i0 < 0 ? a2[0] : a2[3];
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44 T ("%s", s0); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
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45 s0 = i0 < 0 ? "123456" : a2[4];
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46 T ("%s", s0); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
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47
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48 const char *s1 = i0 < 0 ? a2[3] : a2[0];
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49 T ("%s", s1); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
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50
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51 const char *s2 = i0 < 0 ? a2[3] : a2[4];
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52 T ("%s", s2); /* { dg-warning ".%s. directive argument is not a nul-terminated string" } */
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53
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54 s0 = i0 < 0 ? a : b;
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55 T ("%.5s", s0);
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56
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57 /* Verify that the warning triggers even if precision prevents
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58 reading past the end of one of the non-terminated arrays but
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59 not the other. */
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60 T ("%.6s", s0); /* { dg-warning ".%.6s. directive argument is not a nul-terminated string" } */
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61
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62 s0 = i0 < 0 ? b : a;
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63 T ("%.7s", s0); /* { dg-warning ".%.7s. directive argument is not a nul-terminated string" } */
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64
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65 /* Verify that at -Wformat-overflow=1 the lower bound of precision
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66 given by a range is used to determine whether or not to warn. */
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67 int r = SR (4, 5);
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68
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69 T ("%.*s", r, a);
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70 T ("%.*s", r, b);
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71
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72 r = SR (5, 6);
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73 T ("%.*s", r, a);
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74 T ("%.*s", r, b);
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75
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76 r = SR (6, 7);
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77 T ("%.*s", r, a); /* { dg-warning ".%.\\\*s. directive argument is not a nul-terminated string" } */
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78 T ("%.*s", r, b);
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79 }
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80
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81
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82 const wchar_t wa[5] = L"12345"; /* { dg-message "declared here" } */
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83
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84 void test_wide (void)
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85 {
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86 T ("%.0ls%.1ls%.2ls%.3ls%.4ls%.5ls", wa, wa, wa, wa, wa, wa);
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87
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88 T ("%ls", wa); /* { dg-warning ".%ls. directive argument is not a nul-terminated string" } */
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89 T ("%.6ls", wa); /* { dg-warning ".%.6ls. directive argument is not a nul-terminated string" } */
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90 }
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