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5.6 memchr—find character in memory

Synopsis 

     #include <string.h>
     void *memchr(const void *src, int c, size_t length);

Description
This function searches memory starting at *src for the character c. The search only ends with the first occurrence of c, or after length characters; in particular, NUL does not terminate the search.
Returns
If the character c is found within length characters of *src, a pointer to the character is returned. If c is not found, then NULL is returned.
Portability
memchr is ANSI C.

memchr requires no supporting OS subroutines.