1MEMMEM(3) Linux Programmer's Manual MEMMEM(3)
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6 memmem - locate a substring
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9 #define _GNU_SOURCE /* See feature_test_macros(7) */
10 #include <string.h>
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12 void *memmem(const void *haystack, size_t haystacklen,
13 const void *needle, size_t needlelen);
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16 The memmem() function finds the start of the first occurrence of the
17 substring needle of length needlelen in the memory area haystack of
18 length haystacklen.
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21 The memmem() function returns a pointer to the beginning of the sub‐
22 string, or NULL if the substring is not found.
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25 For an explanation of the terms used in this section, see
26 attributes(7).
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28 ┌──────────┬───────────────┬─────────┐
29 │Interface │ Attribute │ Value │
30 ├──────────┼───────────────┼─────────┤
31 │memmem() │ Thread safety │ MT-Safe │
32 └──────────┴───────────────┴─────────┘
34 This function is not specified in POSIX.1, but is present on a number
35 of other systems.
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38 In glibc 2.0, if needle is empty, memmem() returns a pointer to the
39 last byte of haystack. This is fixed in glibc 2.1.
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42 bstring(3), strstr(3)
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45 This page is part of release 5.04 of the Linux man-pages project. A
46 description of the project, information about reporting bugs, and the
47 latest version of this page, can be found at
48 https://www.kernel.org/doc/man-pages/.
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52GNU 2017-03-13 MEMMEM(3)