1 /* PR middle-end/79692 - -Wformat-overflow false positive on an integer
2 directive with unknown width
3 { dg-do compile }
4 { dg-options "-O2 -Wall -Wformat-overflow=1 -ftrack-macro-expansion=0" }
5 { dg-require-effective-target int32plus } */
6
7 typedef __SIZE_TYPE__ size_t;
8 typedef __WCHAR_TYPE__ wchar_t;
9
10 #define INT_MAX __INT_MAX__
11 #define INT_MIN (-INT_MAX - 1)
12
13 /* When debugging, define LINE to the line number of the test case to exercise
14 and avoid exercising any of the others. The buffer and objsize macros
15 below make use of LINE to avoid warnings for other lines. */
16 #ifndef LINE
17 # define LINE 0
18 #endif
19
20 void sink (char*, char*);
21
22 int dummy_sprintf (char*, const char*, ...);
23
24 char buffer [1024];
25 extern char *ptr;
26
27 static int int_range (int min, int max)
28 {
29 extern int int_value (void);
30 int n = int_value ();
31 return n < min || max < n ? min : n;
32 }
33
34 /* Evaluate to an array of SIZE characters when non-negative, or to
35 a pointer to an unknown object otherwise. */
36 #define buffer(size) \
37 ((0 <= size) ? buffer + sizeof buffer - (size) : ptr)
38
39 /* Helper to expand function to either __builtin_f or dummy_f to
40 make debugging GCC easy. */
41 #define FUNC(f) \
42 ((!LINE || LINE == __LINE__) ? __builtin_ ## f : dummy_ ## f)
43
44 /* Macro to verify that calls to __builtin_sprintf (i.e., with no size
45 argument) issue diagnostics by correctly determining the size of
46 the destination buffer. */
47 #define T(size, ...) \
48 (FUNC (sprintf) (buffer (size), __VA_ARGS__), \
49 sink (buffer, ptr))
50
51 /* Return a signed integer in the range [MIN, MAX]. */
52 #define R(min, max) int_range (min, max)
53
54 void test_unknown_width_integer (int w, int i)
55 {
56 T (10, "%*d", w, i);
57 T (10, "%*d", w, R (0, 12345));
58
59 T (10, "%*i", w, i);
60 T (10, "%*i", w, R (0, 12345));
61
62 T (10, "%*o", w, i);
63 T (10, "%*o", w, R (0, 12345));
64
65 T (10, "%*i", w, i);
66 T (10, "%*i", w, R (0, 12345));
67 }
68
69 void test_unknown_width_floating (int w, double d)
70 {
71 T ( 7, "%*a", w, d);
72 T (21, "%*a", w, 3.141);
73
74 T (12, "%*e", w, d); /* { dg-warning "may write a terminating nul" } */
75 T (12, "%#*e", w, d); /* { dg-warning "may write a terminating nul" } */
76 T (13, "%*e", w, d);
77 T (13, "%#*e", w, d);
78 T (13, "%*e", w, 3.141);
79
80 T ( 8, "%*f", w, d); /* { dg-warning "may write a terminating nul" } */
81 T ( 8, "%#*f", w, d); /* { dg-warning "may write a terminating nul" } */
82 T ( 9, "%*f", w, d);
83 T ( 9, "%#*f", w, d);
84 T ( 9, "%*f", w, 3.141);
85 T ( 9, "%#*f", w, 3.141);
86
87 T (12, "%*g", w, d); /* { dg-warning "may write a terminating nul" } */
88 T (13, "%*g", w, d);
89 T (13, "%*g", w, 3.141);
90 }
91
92 void test_unknown_precision_integer (int p, int i, double d)
93 {
94 T (10, "%.*d", p, i);
95 T (10, "%.*d", p, R (0, 12345));
96
97 T (10, "%.*i", p, i);
98 T (10, "%.*i", p, R (0, 12345));
99
100 T (10, "%.*o", p, i);
101 T (10, "%.*o", p, R (0, 12345));
102
103 T (10, "%.*i", p, i);
104 T (10, "%.*i", p, R (0, 12345));
105 }
106
107 void test_unknown_precision_floating (int p, double d)
108 {
109 T ( 0, "%.*a", R (-1, 0), d); /* { dg-warning "between 3 and 24 " } */
110 T ( 6, "%.*a", R (-1, 0), d); /* { dg-warning "may write a terminating nul" } */
111 T ( 7, "%.*a", R (-1, 0), d);
112 T ( 7, "%.*a", p, d);
113 T (21, "%.*a", p, 3.141);
114
115 T ( 0, "%.*e", R (-1, 0), d); /* { dg-warning "between 3 and 14 " } */
116 T ( 0, "%.*e", R (-1, 6), d); /* { dg-warning "between 3 and 14 " } */
117 T ( 5, "%.*e", R (-1, 6), d); /* { dg-warning "may write a terminating nul" } */
118 T ( 6, "%.*e", R (-1, 6), d);
119 /* "%.0e", 0.0 results in 3 or 5 bytes: "inf"/"nan" or "0e+00" */
120 T ( 5, "%.*e", p, d); /* { dg-warning "may write a terminating nul" } */
121 /* "%#.0e", 0.0 results in 3 or 6 bytes: "inf"/"nan" or "0.e+00" */
122 T ( 6, "%#.*e", p, d); /* { dg-warning "may write a terminating nul" } */
123 T ( 6, "%.*e", p, d);
124 T ( 6, "%.*e", p, 3.141);
125 T ( 6, "%#.*e", p, 3.141); /* { dg-warning "writing a terminating nul" } */
126 T ( 7, "%#.*e", p, 3.141);
127
128 T ( 0, "%.*f", R (-1, 0), d); /* { dg-warning "between 1 and 317 " } */
129 T ( 0, "%.*f", R (-1, 6), d); /* { dg-warning "between 1 and 317 " } */
130 T ( 3, "%.*f", R (-1, 6), d); /* { dg-warning "may write a terminating nul" } */
131 T ( 4, "%.*f", R (-1, 6), d);
132 /* "%.0f", 0.0 results in 1 byte: "0" but precision of at least 1
133 is likely, resulting in "0.0". */
134 T ( 3, "%.*f", p, d); /* { dg-warning "may write a terminating nul" } */
135 /* "%#.0f", 0.0 results in 2 bytes: "0." but precision of at least 1
136 is likely, resulting in "0.0". */
137 T ( 3, "%#.*f", p, d); /* { dg-warning "may write a terminating nul" } */
138 T ( 4, "%.*f", p, d);
139 T ( 4, "%#.*f", p, d);
140 T ( 3, "%.*f", p, 3.141); /* { dg-warning "may write a terminating nul" } */
141 T ( 4, "%.*f", p, 3.141);
142 T ( 3, "%#.*f", p, 3.141); /* { dg-warning "may write a terminating nul" } */
143 T ( 4, "%#.*f", p, 3.141);
144
145 T ( 0, "%.*g", R (-1, 0), d); /* { dg-warning "between 1 and 13 " } */
146 T (12, "%.*g", R (-1, 0), d); /* { dg-warning "may write a terminating nul" } */
147 T (13, "%.*g", R (-1, 0), d);
148 T (12, "%.*g", p, d); /* { dg-warning "may write a terminating nul" } */
149 T (12, "%#.*g", p, d); /* { dg-warning "may write a terminating nul" } */
150 T (13, "%.*g", p, d);
151 T (13, "%#.*g", p, d);
152 T (12, "%#.*g", R (-1, 0), d);/* { dg-warning "may write a terminating nul" } */
153 T (12, "%#.*g", R (-1, 6), d);/* { dg-warning "may write a terminating nul" } */
154 T (13, "%#.*g", R (-1, 0), d);
155 T ( 6, "%#.*g", R ( 0, 0), d);/* { dg-warning "may write a terminating nul" } */
156 T ( 7, "%#.*g", R ( 0, 0), d);
157 T ( 6, "%#.*g", R ( 0, 1), d);/* { dg-warning "may write a terminating nul" } */
158 T ( 7, "%#.*g", R ( 0, 1), d);
159 T ( 3, "%.*g", p, 3.141); /* { dg-warning "may write a terminating nul" } */
160 T ( 4, "%.*g", p, 3.141);
161 T ( 3, "%#.*g", p, 3.141); /* { dg-warning "may write a terminating nul" } */
162 T ( 4, "%#.*g", p, 3.141);
163 }
164
165
166 void test_unknown_width_and_precision_integer (int w, int p, int i)
167 {
168 T (10, "%*.*d", w, p, i);
169 T (10, "%*.*d", w, p, R (0, 12345));
170
171 T (10, "%*.*i", w, p, i);
172 T (10, "%*.*i", w, p, R (0, 12345));
173
174 T (10, "%*.*o", w, p, i);
175 T (10, "%*.*o", w, p, R (0, 12345));
176
177 T (10, "%*.*i", w, p, i);
178 T (10, "%*.*i", w, p, R (0, 12345));
179 }
180
181 void test_unknown_width_and_precision_floating (int w, int p, double d)
182 {
183 T ( 7, "%*.*a", w, p, d);
184 T (21, "%*.*a", w, p, 3.141);
185
186 /* "%0.0e", 0.0 results in 3 or 5 bytes: "inf"/"nan" or "0e+00" */
187 T ( 5, "%*.*e", w, p, d); /* { dg-warning "may write a terminating nul" } */
188 /* "%#0.0e", 0.0 results in 3 or 6 bytes: "inf"/"nan" or "0.e+00" */
189 T ( 6, "%#*.*e", w, p, d); /* { dg-warning "may write a terminating nul" } */
190 T ( 6, "%*.*e", w, p, d);
191 T ( 6, "%*.*e", w, p, 3.141);
192 T ( 6, "%#*.*e", w, p, 3.141);/* { dg-warning "writing a terminating nul" } */
193 T ( 7, "%#*.*e", w, p, 3.141);
194
195 T ( 3, "%*.*f", w, p, d); /* { dg-warning "may write a terminating nul" } */
196 T ( 3, "%#*.*f", w, p, d); /* { dg-warning "may write a terminating nul" } */
197 T ( 4, "%*.*f", w, p, d);
198 T ( 4, "%*.*f", w, p, 3.141);
199 T ( 4, "%#*.*f", w, p, 3.141);
200
201 T (13, "%*.*g", w, p, d);
202 T (13, "%#*.*g", w, p, d);
203 T (13, "%*.*g", w, p, 3.141);
204 T (13, "%#*.*g", w, p, 3.141);
205 }