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1 | .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
2 | .\" | |
93015253 | 3 | .\" %%%LICENSE_START(VERBATIM) |
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4 | .\" Permission is granted to make and distribute verbatim copies of this |
5 | .\" manual provided the copyright notice and this permission notice are | |
6 | .\" preserved on all copies. | |
7 | .\" | |
8 | .\" Permission is granted to copy and distribute modified versions of this | |
9 | .\" manual under the conditions for verbatim copying, provided that the | |
10 | .\" entire resulting derived work is distributed under the terms of a | |
11 | .\" permission notice identical to this one. | |
c13182ef | 12 | .\" |
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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14 | .\" manual page may be incorrect or out-of-date.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 | |
15 | .\" responsibility for errors or omissions, or for damages resulting from | |
16 | .\" the use of the information contained herein. The author(s) may not | |
17 | .\" have taken the same level of care in the production of this manual, | |
18 | .\" which is licensed free of charge, as they might when working | |
19 | .\" professionally. | |
c13182ef | 20 | .\" |
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21 | .\" Formatted or processed versions of this manual, if unaccompanied by |
22 | .\" the source, must acknowledge the copyright and authors of this work. | |
4b72fb64 | 23 | .\" %%%LICENSE_END |
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24 | .\" |
25 | .\" References consulted: | |
26 | .\" Linux libc source code | |
27 | .\" 386BSD man pages | |
28 | .\" Modified Sat Jul 24 18:50:48 1993 by Rik Faith (faith@cs.unc.edu) | |
2b0fa182 | 29 | .\" Interchanged 'needle' and 'haystack'; added history, aeb, 980113. |
31a1b45e | 30 | .TH MEMMEM 3 2017-03-13 "GNU" "Linux Programmer's Manual" |
fea681da MK |
31 | .SH NAME |
32 | memmem \- locate a substring | |
33 | .SH SYNOPSIS | |
34 | .nf | |
b80f966b | 35 | .BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */" |
fea681da | 36 | .B #include <string.h> |
68e4db0a | 37 | .PP |
fea681da | 38 | .BI "void *memmem(const void *" haystack ", size_t " haystacklen , |
088a639b | 39 | .BI " const void *" needle ", size_t " needlelen ); |
fea681da MK |
40 | .fi |
41 | .SH DESCRIPTION | |
60a90ecd MK |
42 | The |
43 | .BR memmem () | |
44 | function finds the start of the first occurrence | |
c6fa0841 | 45 | of the substring |
51700fd7 | 46 | .IR needle |
c6fa0841 MK |
47 | of length |
48 | .I needlelen | |
49 | in the memory | |
50 | area | |
51 | .I haystack | |
52 | of length | |
53 | .IR haystacklen . | |
47297adb | 54 | .SH RETURN VALUE |
60a90ecd MK |
55 | The |
56 | .BR memmem () | |
57 | function returns a pointer to the beginning of the | |
fea681da | 58 | substring, or NULL if the substring is not found. |
34a07418 | 59 | .SH ATTRIBUTES |
346143cd PH |
60 | For an explanation of the terms used in this section, see |
61 | .BR attributes (7). | |
62 | .TS | |
63 | allbox; | |
64 | lb lb lb | |
65 | l l l. | |
66 | Interface Attribute Value | |
67 | T{ | |
34a07418 | 68 | .BR memmem () |
346143cd PH |
69 | T} Thread safety MT-Safe |
70 | .TE | |
47297adb | 71 | .SH CONFORMING TO |
1b238553 MK |
72 | This function is not specified in POSIX.1, |
73 | but is present on a number of other systems. | |
fea681da | 74 | .SH BUGS |
b5a620f8 MK |
75 | .\" This function was broken in Linux libraries up to and including libc 5.0.9; |
76 | .\" there the | |
77 | .\" .IR needle | |
78 | .\" and | |
79 | .\" .I haystack | |
80 | .\" arguments were interchanged, | |
81 | .\" and a pointer to the end of the first occurrence of | |
82 | .\" .I needle | |
83 | .\" was returned. | |
ef4f4031 | 84 | .\" |
b5a620f8 MK |
85 | .\" Both old and new libc's have the bug that if |
86 | .\" .I needle | |
87 | .\" is empty, | |
88 | .\" .I haystack\-1 | |
89 | .\" (instead of | |
90 | .\" .IR haystack ) | |
91 | .\" is returned. | |
6e76df0d MK |
92 | In glibc 2.0, if |
93 | .I needle | |
94 | is empty, | |
95 | .BR memmem () | |
96 | returns a pointer to the last byte of | |
c6fa0841 | 97 | .IR haystack . |
ca7b3c18 | 98 | This is fixed in glibc 2.1. |
47297adb | 99 | .SH SEE ALSO |
879091c9 | 100 | .BR bstring (3), |
0a4f8b7b | 101 | .BR strstr (3) |