Developer's Daily | Unix by Example |
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memmem ? locate a substring |
#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 haystacklen. |
The memmem() function returns a pointer to the beginning of the substring, or NULL if the substring is not found. |
This function is a GNU extension. |
This function was broken in Linux libraries up to and
including libc 5.0.9; there the ‘needle’ and
‘haystack’ arguments were interchanged, and a
pointer to the end of the first occurrence of needle
was returned. Since libc 5.0.9 is still widely used, this is
a dangerous function to use. |
strstr(3) |