128 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <malloc.h>3#include <stdlib.h>4#include <string.h>5#include <time.h>6#include "utils.h"7 8#define SIZE 2569#define ITERATIONS 100010#define ITERATIONS_BENCH 10000011 12int test_strlen(const void *s);13 14/* test all offsets and lengths */15static 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 36static 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 51static 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 124int main(void)125{126 return test_harness(testcase, "strlen");127}128