1 // SPDX-License-Identifier: GPL-2.0
2 #include <malloc.h>
3 #include <stdlib.h>
4 #include <string.h>
5 #include <time.h>
6 #include "utils.h"
7
8 #define SIZE 256
9 #define ITERATIONS 1000
10 #define ITERATIONS_BENCH 100000
11
12 int test_strlen(const void *s);
13
14 /* test all offsets and lengths */
15 static void test_one(char *s)
16 {
17 unsigned long offset;
18
19 for (offset = 0; offset < SIZE; offset++) {
20 int x, y;
21 unsigned long i;
22
23 y = strlen(s + offset);
24 x = test_strlen(s + offset);
25
26 if (x != y) {
27 printf("strlen() returned %d, should have returned %d (%p offset %ld)\n", x, y, s, offset);
28
29 for (i = offset; i < SIZE; i++)
30 printf("%02x ", s[i]);
31 printf("\n");
32 }
33 }
34 }
35
36 static void bench_test(char *s)
37 {
38 struct timespec ts_start, ts_end;
39 int i;
40
41 clock_gettime(CLOCK_MONOTONIC, &ts_start);
42
43 for (i = 0; i < ITERATIONS_BENCH; i++)
44 test_strlen(s);
45
46 clock_gettime(CLOCK_MONOTONIC, &ts_end);
47
48 printf("len %3.3d : time = %.6f\n", test_strlen(s), ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
49 }
50
51 static int testcase(void)
52 {
53 char *s;
54 unsigned long i;
55
56 s = memalign(128, SIZE);
57 if (!s) {
58 perror("memalign");
59 exit(1);
60 }
61
62 srandom(1);
63
64 memset(s, 0, SIZE);
65 for (i = 0; i < SIZE; i++) {
66 char c;
67
68 do {
69 c = random() & 0x7f;
70 } while (!c);
71 s[i] = c;
72 test_one(s);
73 }
74
75 for (i = 0; i < ITERATIONS; i++) {
76 unsigned long j;
77
78 for (j = 0; j < SIZE; j++) {
79 char c;
80
81 do {
82 c = random() & 0x7f;
83 } while (!c);
84 s[j] = c;
85 }
86 for (j = 0; j < sizeof(long); j++) {
87 s[SIZE - 1 - j] = 0;
88 test_one(s);
89 }
90 }
91
92 for (i = 0; i < SIZE; i++) {
93 char c;
94
95 do {
96 c = random() & 0x7f;
97 } while (!c);
98 s[i] = c;
99 }
100
101 bench_test(s);
102
103 s[16] = 0;
104 bench_test(s);
105
106 s[8] = 0;
107 bench_test(s);
108
109 s[4] = 0;
110 bench_test(s);
111
112 s[3] = 0;
113 bench_test(s);
114
115 s[2] = 0;
116 bench_test(s);
117
118 s[1] = 0;
119 bench_test(s);
120
121 return 0;
122 }
123
124 int main(void)
125 {
126 return test_harness(testcase, "strlen");
127 }
128
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