1 /* Measure strsep 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 TEST_MAIN
20 #define TEST_NAME "strsep"
21 #include "bench-string.h"
22
23 char *
simple_strsep(char ** s1,char * s2)24 simple_strsep (char **s1, char *s2)
25 {
26 char *begin;
27 char *s;
28 size_t j = 0;
29
30 begin = *s1;
31 s = begin;
32 if (begin == NULL)
33 return NULL;
34 ssize_t s2len = strlen (s2);
35 while (*s)
36 {
37 for (j = 0; j < s2len; j++)
38 {
39 if (*s == s2[j])
40 {
41 s[0] = '\0';
42 *s1 = s + 1;
43 return begin;
44 }
45 }
46 s++;
47 }
48 *s1 = NULL;
49 return begin;
50 }
51
52 char *
oldstrsep(char ** stringp,const char * delim)53 oldstrsep (char **stringp, const char *delim)
54 {
55 char *begin, *end;
56
57 begin = *stringp;
58 if (begin == NULL)
59 return NULL;
60
61 /* A frequent case is when the delimiter string contains only one
62 character. Here we don't need to call the expensive `strpbrk'
63 function and instead work using `strchr'. */
64 if (delim[0] == '\0' || delim[1] == '\0')
65 {
66 char ch = delim[0];
67
68 if (ch == '\0')
69 end = NULL;
70 else
71 {
72 if (*begin == ch)
73 end = begin;
74 else if (*begin == '\0')
75 end = NULL;
76 else
77 end = strchr (begin + 1, ch);
78 }
79 }
80 else
81 /* Find the end of the token. */
82 end = strpbrk (begin, delim);
83
84 if (end)
85 {
86 /* Terminate the token and set *STRINGP past NUL character. */
87 *end++ = '\0';
88 *stringp = end;
89 }
90 else
91 /* No more delimiters; this is the last token. */
92 *stringp = NULL;
93
94 return begin;
95 }
96
97 typedef char *(*proto_t) (const char **, const char *);
98
99 IMPL (simple_strsep, 0)
100 IMPL (strsep, 1)
101 IMPL (oldstrsep, 2)
102
103 static void
do_one_test(impl_t * impl,const char * s1,const char * s2)104 do_one_test (impl_t * impl, const char *s1, const char *s2)
105 {
106 size_t i, iters = INNER_LOOP_ITERS_SMALL;
107 timing_t start, stop, cur;
108
109 TIMING_NOW (start);
110 for (i = 0; i < iters; ++i)
111 {
112 const char *s1a = s1;
113 CALL (impl, &s1a, s2);
114 if (s1a != NULL)
115 ((char*)s1a)[-1] = '1';
116 }
117 TIMING_NOW (stop);
118
119 TIMING_DIFF (cur, start, stop);
120
121 TIMING_PRINT_MEAN ((double) cur, (double) iters);
122 }
123
124 static void
do_test(size_t align1,size_t align2,size_t len1,size_t len2,int fail)125 do_test (size_t align1, size_t align2, size_t len1, size_t len2, int fail)
126 {
127 char *s2 = (char *) (buf2 + align2);
128
129 /* Search for a delimiter in a string containing mostly '0', so don't
130 use '0' as a delimiter. */
131 static const char d[] = "123456789abcdefg";
132 #define dl (sizeof (d) - 1)
133 char *ss2 = s2;
134 for (size_t l = len2; l > 0; l = l > dl ? l - dl : 0)
135 {
136 size_t t = l > dl ? dl : l;
137 ss2 = mempcpy (ss2, d, t);
138 }
139 s2[len2] = '\0';
140
141 printf ("Length %4zd/%zd, alignment %2zd/%2zd, %s:",
142 len1, len2, align1, align2, fail ? "fail" : "found");
143
144 FOR_EACH_IMPL (impl, 0)
145 {
146 char *s1 = (char *) (buf1 + align1);
147 memset (s1, '0', len1);
148 if (!fail)
149 s1[len1 / 2] = '1';
150 s1[len1] = '\0';
151 do_one_test (impl, s1, s2);
152 }
153 putchar ('\n');
154 }
155
156 static int
test_main(void)157 test_main (void)
158 {
159 test_init ();
160
161 printf ("%23s", "");
162 FOR_EACH_IMPL (impl, 0)
163 printf ("\t%s", impl->name);
164 putchar ('\n');
165
166 for (size_t klen = 2; klen < 32; ++klen)
167 for (size_t hlen = 4 * klen; hlen < 8 * klen; hlen += klen)
168 {
169 do_test (0, 0, hlen, klen, 0);
170 do_test (0, 0, hlen, klen, 1);
171 do_test (0, 3, hlen, klen, 0);
172 do_test (0, 3, hlen, klen, 1);
173 do_test (0, 9, hlen, klen, 0);
174 do_test (0, 9, hlen, klen, 1);
175 do_test (0, 15, hlen, klen, 0);
176 do_test (0, 15, hlen, klen, 1);
177
178 do_test (3, 0, hlen, klen, 0);
179 do_test (3, 0, hlen, klen, 1);
180 do_test (3, 3, hlen, klen, 0);
181 do_test (3, 3, hlen, klen, 1);
182 do_test (3, 9, hlen, klen, 0);
183 do_test (3, 9, hlen, klen, 1);
184 do_test (3, 15, hlen, klen, 0);
185 do_test (3, 15, hlen, klen, 1);
186
187 do_test (9, 0, hlen, klen, 0);
188 do_test (9, 0, hlen, klen, 1);
189 do_test (9, 3, hlen, klen, 0);
190 do_test (9, 3, hlen, klen, 1);
191 do_test (9, 9, hlen, klen, 0);
192 do_test (9, 9, hlen, klen, 1);
193 do_test (9, 15, hlen, klen, 0);
194 do_test (9, 15, hlen, klen, 1);
195
196 do_test (15, 0, hlen, klen, 0);
197 do_test (15, 0, hlen, klen, 1);
198 do_test (15, 3, hlen, klen, 0);
199 do_test (15, 3, hlen, klen, 1);
200 do_test (15, 9, hlen, klen, 0);
201 do_test (15, 9, hlen, klen, 1);
202 do_test (15, 15, hlen, klen, 0);
203 do_test (15, 15, hlen, klen, 1);
204 }
205 do_test (0, 0, page_size - 1, 16, 0);
206 do_test (0, 0, page_size - 1, 16, 1);
207
208 return ret;
209 }
210
211 #include <support/test-driver.c>
212