1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#define TEST(r, f, x, m) ( \
((r) = (f)) == (x) || \
(printf(__FILE__ ":%d: %s failed (" m ")\n", __LINE__, #f, r, x), err++, 0) )
#define TEST_S(s, x, m) ( \
!strcmp((s),(x)) || \
(printf(__FILE__ ":%d: [%s] != [%s] (%s)\n", __LINE__, s, x, m), err++, 0) )
static const struct {
const char *fmt;
int i;
const char *expect;
} int_tests[] = {
/* width, precision, alignment */
{ "%04d", 12, "0012" },
{ "%.3d", 12, "012" },
{ "%3d", 12, " 12" },
{ "%-3d", 12, "12 " },
{ "%+3d", 12, "+12" },
{ "%+-5d", 12, "+12 " },
{ "%+- 5d", 12, "+12 " },
{ "%- 5d", 12, " 12 " },
{ "% d", 12, " 12" },
{ "%0-5d", 12, "12 " },
{ "%-05d", 12, "12 " },
/* ...explicit precision of 0 shall be no characters. */
{ "%.0d", 0, "" },
{ "%.0o", 0, "" },
{ "%#.0d", 0, "" },
{ "%#.0o", 0, "" },
{ "%#.0x", 0, "" },
/* ...but it still has to honor width and flags. */
{ "%2.0u", 0, " " },
{ "%02.0u", 0, " " },
{ "%2.0d", 0, " " },
{ "%02.0d", 0, " " },
{ "% .0d", 0, " " },
{ "%+.0d", 0, "+" },
/* hex: test alt form and case */
{ "%x", 63, "3f" },
{ "%#x", 63, "0x3f" },
{ "%X", 63, "3F" },
/* octal: test alt form */
{ "%o", 15, "17" },
{ "%#o", 15, "017" },
{ NULL, 0.0, NULL }
};
static const struct {
const char *fmt;
double f;
const char *expect;
} fp_tests[] = {
/* basic form, handling of exponent/precision for 0 */
{ "%e", 0.0, "0.000000e+00" },
{ "%f", 0.0, "0.000000" },
{ "%g", 0.0, "0" },
{ "%#g", 0.0, "0.00000" },
/* rounding */
{ "%f", 1.1, "1.100000" },
{ "%f", 1.2, "1.200000" },
{ "%f", 1.3, "1.300000" },
{ "%f", 1.4, "1.400000" },
{ "%f", 1.5, "1.500000" },
{ "%.4f", 1.06125, "1.0612" },
{ "%.2f", 1.375, "1.38" },
{ "%.1f", 1.375, "1.4" },
{ "%.15f", 1.1, "1.100000000000000" },
{ "%.16f", 1.1, "1.1000000000000001" },
{ "%.17f", 1.1, "1.10000000000000009" },
{ "%.2e", 1500001.0, "1.50e+06" },
{ "%.2e", 1505000.0, "1.50e+06" },
{ "%.2e", 1505000.00000095367431640625, "1.51e+06" },
{ "%.2e", 1505001.0, "1.51e+06" },
{ "%.2e", 1506000.0, "1.51e+06" },
/* correctness in DBL_DIG places */
{ "%.15g", 1.23456789012345, "1.23456789012345" },
/* correct choice of notation for %g */
{ "%g", 0.0001, "0.0001" },
{ "%g", 0.00001, "1e-05" },
{ "%g", 123456, "123456" },
{ "%g", 1234567, "1.23457e+06" },
{ "%.7g", 1234567, "1234567" },
{ "%.7g", 12345678, "1.234568e+07" },
{ "%.8g", 0.1, "0.1" },
{ "%.9g", 0.1, "0.1" },
{ "%.10g", 0.1, "0.1" },
{ "%.11g", 0.1, "0.1" },
/* pi in double precision, printed to a few extra places */
{ "%.15f", M_PI, "3.141592653589793" },
{ "%.18f", M_PI, "3.141592653589793116" },
/* exact conversion of large integers */
{ "%.0f", 340282366920938463463374607431768211456.0,
"340282366920938463463374607431768211456" },
{ NULL, 0.0, NULL }
};
int test_snprintf(void)
{
int i, j, k;
int err=0;
char b[2000], *s;
TEST(i, snprintf(0, 0, "%d", 123456), 6, "length returned %d != %d");
TEST(i, snprintf(0, 0, "%.4s", "hello"), 4, "length returned %d != %d");
TEST(i, snprintf(b, 0, "%.0s", "goodbye"), 0, "length returned %d != %d");
strcpy(b, "xxxxxxxx");
TEST(i, snprintf(b, 4, "%d", 123456), 6, "length returned %d != %d");
TEST_S(b, "123", "incorrect output");
TEST(i, b[5], 'x', "buffer overrun");
/* Perform ascii arithmetic to test printing tiny doubles */
TEST(i, snprintf(b, sizeof b, "%.1022f", 0x1p-1021), 1024, "%d != %d");
b[1] = '0';
for (i=0; i<1021; i++) {
for (k=0, j=1023; j>0; j--) {
if (b[j]<'5') b[j]+=b[j]-'0'+k, k=0;
else b[j]+=b[j]-'0'-10+k, k=1;
}
}
TEST(i, b[1], '1', "'%c' != '%c'");
for (j=2; b[j]=='0'; j++);
TEST(i, j, 1024, "%d != %d");
#ifndef DISABLE_SLOW_TESTS
errno = 0;
TEST(i, snprintf(NULL, 0, "%.*u", 2147483647, 0), 2147483647, "cannot print max length %d");
TEST(i, snprintf(NULL, 0, "%.*u ", 2147483647, 0), -1, "integer overflow %d");
TEST(i, errno, EOVERFLOW, "after overflow: %d != %d");
#endif
for (j=0; int_tests[j].fmt; j++) {
TEST(i, snprintf(b, sizeof b, int_tests[j].fmt, int_tests[j].i), strlen(b), "%d != %d");
TEST_S(b, int_tests[j].expect, "bad integer conversion");
}
for (j=0; fp_tests[j].fmt; j++) {
TEST(i, snprintf(b, sizeof b, fp_tests[j].fmt, fp_tests[j].f), strlen(b), "%d != %d");
TEST_S(b, fp_tests[j].expect, "bad floating point conversion");
}
TEST(i, snprintf(0, 0, "%.4a", 1.0), 11, "%d != %d");
return err;
}
|
