1/* Measure strncpy functions.
2 Copyright (C) 2013-2022 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#define BIG_CHAR MAX_CHAR
20
21#ifdef WIDE
22# define SMALL_CHAR 1273
23#else
24# define SMALL_CHAR 127
25#endif /* !WIDE */
26
27#ifndef STRNCPY_RESULT
28# define STRNCPY_RESULT(dst, len, n) dst
29# define TEST_MAIN
30# ifndef WIDE
31# define TEST_NAME "strncpy"
32# else
33# define TEST_NAME "wcsncpy"
34# define generic_strncpy generic_wcsncpy
35# endif /* WIDE */
36# include "bench-string.h"
37
38CHAR *
39generic_strncpy (CHAR *dst, const CHAR *src, size_t n)
40{
41 size_t nc = STRNLEN (src, n);
42 if (nc != n)
43 MEMSET (dst + nc, 0, n - nc);
44 return MEMCPY (dst, src, nc);
45}
46
47IMPL (STRNCPY, 1)
48IMPL (generic_strncpy, 0)
49
50#endif /* !STRNCPY_RESULT */
51
52typedef CHAR *(*proto_t) (CHAR *, const CHAR *, size_t);
53
54static void
55do_one_test (impl_t *impl, CHAR *dst, const CHAR *src, size_t len, size_t n)
56{
57 size_t i, iters = INNER_LOOP_ITERS_LARGE * (4 / CHARBYTES);
58 timing_t start, stop, cur;
59
60 if (CALL (impl, dst, src, n) != STRNCPY_RESULT (dst, len, n))
61 {
62 error (status: 0, errnum: 0, format: "Wrong result in function %s %p %p", impl->name,
63 CALL (impl, dst, src, n), dst);
64 ret = 1;
65 return;
66 }
67
68 if (memcmp (dst, src, (len > n ? n : len) * sizeof (CHAR)) != 0)
69 {
70 error (status: 0, errnum: 0, format: "Wrong result in function %s", impl->name);
71 ret = 1;
72 return;
73 }
74
75 if (n > len)
76 {
77 size_t i;
78
79 for (i = len; i < n; ++i)
80 if (dst [i] != '\0')
81 {
82 error (status: 0, errnum: 0, format: "Wrong result in function %s", impl->name);
83 ret = 1;
84 return;
85 }
86 }
87
88 TIMING_NOW (start);
89 for (i = 0; i < iters; ++i)
90 {
91 CALL (impl, dst, src, n);
92 }
93 TIMING_NOW (stop);
94
95 TIMING_DIFF (cur, start, stop);
96
97 TIMING_PRINT_MEAN ((double) cur, (double) iters);
98}
99
100static void
101do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char)
102{
103 size_t i;
104 CHAR *s1, *s2;
105
106/* For wcsncpy: align1 and align2 here mean alignment not in bytes,
107 but in wchar_ts, in bytes it will equal to align * (sizeof (wchar_t)). */
108 align1 &= 7;
109 if ((align1 + len) * sizeof (CHAR) >= page_size)
110 return;
111
112 align2 &= 7;
113 if ((align2 + len) * sizeof (CHAR) >= page_size)
114 return;
115
116 s1 = (CHAR *) (buf1) + align1;
117 s2 = (CHAR *) (buf2) + align2;
118
119 for (i = 0; i < len; ++i)
120 s1[i] = 32 + 23 * i % (max_char - 32);
121 s1[len] = 0;
122 for (i = len + 1; (i + align1) * sizeof (CHAR) < page_size && i < len + 64;
123 ++i)
124 s1[i] = 32 + 32 * i % (max_char - 32);
125
126 printf (format: "Length %4zd, n %4zd, alignment %2zd/%2zd:", len, n, align1, align2);
127
128 FOR_EACH_IMPL (impl, 0)
129 do_one_test (impl, dst: s2, src: s1, len, n);
130
131 putchar (c: '\n');
132}
133
134static int
135test_main (void)
136{
137 size_t i;
138
139 test_init ();
140
141 printf (format: "%28s", "");
142 FOR_EACH_IMPL (impl, 0)
143 printf (format: "\t%s", impl->name);
144 putchar (c: '\n');
145
146 for (i = 1; i < 8; ++i)
147 {
148 do_test (align1: i, align2: i, len: 16, n: 16, SMALL_CHAR);
149 do_test (align1: i, align2: i, len: 16, n: 16, BIG_CHAR);
150 do_test (align1: i, align2: 2 * i, len: 16, n: 16, SMALL_CHAR);
151 do_test (align1: 2 * i, align2: i, len: 16, n: 16, BIG_CHAR);
152 do_test (align1: 8 - i, align2: 2 * i, len: 1 << i, n: 2 << i, SMALL_CHAR);
153 do_test (align1: 2 * i, align2: 8 - i, len: 2 << i, n: 1 << i, SMALL_CHAR);
154 do_test (align1: 8 - i, align2: 2 * i, len: 1 << i, n: 2 << i, BIG_CHAR);
155 do_test (align1: 2 * i, align2: 8 - i, len: 2 << i, n: 1 << i, BIG_CHAR);
156 }
157
158 for (i = 1; i < 8; ++i)
159 {
160 do_test (align1: 0, align2: 0, len: 4 << i, n: 8 << i, SMALL_CHAR);
161 do_test (align1: 0, align2: 0, len: 16 << i, n: 8 << i, SMALL_CHAR);
162 do_test (align1: 8 - i, align2: 2 * i, len: 4 << i, n: 8 << i, SMALL_CHAR);
163 do_test (align1: 8 - i, align2: 2 * i, len: 16 << i, n: 8 << i, SMALL_CHAR);
164 }
165
166 return ret;
167}
168
169#include <support/test-driver.c>
170

source code of glibc/benchtests/bench-strncpy.c