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MEMCCPY(3) Library Functions Manual MEMCCPY(3)

copy string until character found

#include <string.h>
void *
memccpy(void *dst, const void *src, int c, size_t len);

The memccpy() function copies bytes from string src to string dst. If the character c (as converted to an unsigned char) occurs in the string src, the copy stops and a pointer to the byte after the copy of c in the string dst is returned. Otherwise, len bytes are copied, and a null pointer is returned.
If the src and dst strings overlap, the behavior is undefined.

bcopy(3), memcpy(3), memmove(3), strcpy(3), strlcpy(3)

The memccpy() function first appeared in AT&T System V UNIX and was reimplemented for 4.3BSD-Tahoe.
September 25, 2013 OpenBSD-current