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111
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1 /* PR middle-end/78519 - missing warning for sprintf %s with null pointer
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2 Also exercises null destination pointer and null format string.
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3 { dg-do compile }
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4 { dg-options "-O2 -Wformat -Wformat-overflow -Wno-nonnull -ftrack-macro-expansion=0" } */
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5
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6 typedef __builtin_va_list va_list;
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7
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8 #define sprintf __builtin_sprintf
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9 #define snprintf __builtin_snprintf
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10 #define vsprintf __builtin_vsprintf
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11 #define vsnprintf __builtin_vsnprintf
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12
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13
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14 static char* null (void)
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15 {
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16 return 0;
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17 }
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18
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19
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20 void sink (int);
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21 #define T sink
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22
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23
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24 /* Verify that calls with a null destination pointer are diagnosed. */
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25
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26 void test_null_dest (va_list va)
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27 {
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28 char *p = null ();
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29 T (sprintf (null (), "%i", 0)); /* { dg-warning "null destination pointer" } */
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30 T (sprintf (p, "%i", 0)); /* { dg-warning "null destination pointer" } */
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31 T (sprintf (p, "%i abc", 0)); /* { dg-warning "null destination pointer" } */
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32
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33 T (snprintf (null (), 1, "%i", 0)); /* { dg-warning "null destination pointer" } */
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34 T (snprintf (p, 2, "%i", 0)); /* { dg-warning "null destination pointer" } */
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35 T (snprintf (p, 3, "%i abc", 0)); /* { dg-warning "null destination pointer" } */
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36
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37 /* Snprintf with a null pointer and a zero size is a special request
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38 to determine the size of output without writing any. Such calls
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39 are valid must not be diagnosed. */
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40 T (snprintf (p, 0, "%i", 0));
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41
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42 T (vsprintf (null (), "%i", va)); /* { dg-warning "null destination pointer" } */
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43 T (vsprintf (p, "%i", va)); /* { dg-warning "null destination pointer" } */
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44
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45 T (vsnprintf (null (), 1, "%i", va)); /* { dg-warning "null destination pointer" } */
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46 T (vsnprintf (p, 2, "%i", va)); /* { dg-warning "null destination pointer" } */
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47 T (vsnprintf (p, 0, "%i", va));
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48 }
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49
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50 void test_null_format (char *d, va_list va)
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51 {
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52 char *fmt = null ();
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53
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54 T (sprintf (d, null ())); /* { dg-warning "null format string" } */
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55 T (sprintf (d, fmt)); /* { dg-warning "null format string" } */
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56
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57 T (snprintf (d, 0, null ())); /* { dg-warning "null format string" } */
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58 T (snprintf (d, 1, fmt)); /* { dg-warning "null format string" } */
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59
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60 T (vsprintf (d, null (), va)); /* { dg-warning "null format string" } */
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61 T (vsprintf (d, fmt, va)); /* { dg-warning "null format string" } */
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62
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63 T (vsnprintf (d, 0, null (), va)); /* { dg-warning "null format string" } */
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64 T (vsnprintf (d, 1, fmt, va)); /* { dg-warning "null format string" } */
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65 }
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66
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67 void test_null_arg (char *d, const char *s)
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68 {
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69 char *p = null ();
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70
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71 T (sprintf (d, "%-s", null ())); /* { dg-warning "directive argument is null" } */
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72 T (sprintf (d, "%-s", p)); /* { dg-warning "directive argument is null" } */
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73 T (sprintf (d, "%s %s", p, s)); /* { dg-warning "directive argument is null" } */
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74 T (sprintf (d, "%s %s", s, p)); /* { dg-warning "directive argument is null" } */
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75 T (sprintf (d, "%s %i", p, 1)); /* { dg-warning "directive argument is null" } */
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76 T (sprintf (d, "%i %s", 1, p)); /* { dg-warning "directive argument is null" } */
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77 T (sprintf (d, "%.0s", p)); /* { dg-warning "directive argument is null" } */
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78 T (sprintf (d, "%1.0s", p)); /* { dg-warning "directive argument is null" } */
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79
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80 T (snprintf (d, 0, "%-s", null ())); /* { dg-warning "directive argument is null" } */
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81 T (snprintf (d, 1, "%-s", p)); /* { dg-warning "directive argument is null" } */
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82
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83 T (sprintf (d, "%i %s", 1, null ())); /* { dg-warning "directive argument is null" } */
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84 T (sprintf (d, "%i %s", 2, p)); /* { dg-warning "directive argument is null" } */
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85
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86 T (snprintf (d, 0, "%i %s", 1, null ())); /* { dg-warning "directive argument is null" } */
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87 T (snprintf (d, 9, "%i %s", 2, p)); /* { dg-warning "directive argument is null" } */
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88
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89 /* A sanity check that the %p directive doesn't emit a warning
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90 with a null pointer. */
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91 T (sprintf (d, "%p", null ()));
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92 T (sprintf (d, "%p", p));
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93 }
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