memmem - locate a substring
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <string.h> void *memmem(const void *haystack, size_t haystacklen, const void *needle, size_t needlelen);
The memmem() function finds the start of the first occurrence of the substring
needle of length
needlelen in the memory area
haystack of length
The memmem() function returns a pointer to the beginning of the substring, or NULL if the substring is not found.
For an explanation of the terms used in this section, see attributes(7).
This function is not specified in POSIX.1, but is present on a number of other systems.
In glibc 2.0, if
needle is empty, memmem() returns a pointer to the last byte of
haystack. This is fixed in glibc 2.1.
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