annotate src/platform/memmem.h @ 4:352169b06523

update
author Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
date Fri, 05 Oct 2018 19:31:02 +0900 (2018-10-05)
parents 2cf249471370
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
1 /* On Linux we use glibc's memmem which uses the Knuth-Morris-Pratt algorithm.
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
2 * We use FreeBSD's libc memmem on Windows and MacOS, which uses
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
3 * Crochemore-Perrin two-way string matching.
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
4 * Reasoning:
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
5 * Windows, does not include any native memmem
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
6 * MacOS has a memmem but is slower and originates from FreeBSD dated to 2005
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
7 * Solaris doesn't seem to have memmem */
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
8
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
9 #if defined(_WIN32) || defined(__APPLE__) || defined(__Darwin__) || defined(__sun)
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
10 #include "../3rdparty/freebsd/memmem.c"
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
11 #else
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
12 /* On systems that use glibc, you must define _GNU_SOURCE before including string.h
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
13 * to get access to memmem. */
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
14 #define _GNU_SOURCE
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
15 #include <string.h>
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
16 #endif
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
17
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
18 void * MVM_memmem(const void *haystack, size_t haystacklen, const void *needle, size_t needlelen) {
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
19 return memmem(haystack, haystacklen, needle, needlelen);
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
20 }
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
21
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
22 /* Extended info:
2cf249471370 convert mercurial for git
Takahiro SHIMIZU <anatofuz@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
23 * In glibc, the Knuth-Morris-Pratt algorithm was added as of git tag glibc-2.8-44-g0caca71ac9 */