1 .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
3 .\" %%%LICENSE_START(VERBATIM)
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13 .\" Since the Linux kernel and libraries are constantly changing, this
14 .\" manual page may be incorrect or out-of-date. The author(s) assume no
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18 .\" which is licensed free of charge, as they might when working
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25 .\" References consulted:
26 .\" Linux libc source code
28 .\" Modified Sat Jul 24 18:50:48 1993 by Rik Faith (faith@cs.unc.edu)
29 .\" Interchanged 'needle' and 'haystack'; added history, aeb, 980113.
30 .TH MEMMEM 3 2014-08-19 "GNU" "Linux Programmer's Manual"
32 memmem \- locate a substring
35 .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
36 .B #include <string.h>
38 .BI "void *memmem(const void *" haystack ", size_t " haystacklen ,
39 .BI " const void *" needle ", size_t " needlelen );
44 function finds the start of the first occurrence
57 function returns a pointer to the beginning of the
58 substring, or NULL if the substring is not found.
60 .SS Multithreading (see pthreads(7))
63 function is thread-safe.
65 This function is a GNU extension.
67 .\" This function was broken in Linux libraries up to and including libc 5.0.9;
72 .\" arguments were interchanged,
73 .\" and a pointer to the end of the first occurrence of
77 .\" Both old and new libc's have the bug that if
88 returns a pointer to the last byte of
90 This is fixed in glibc 2.1.