C언어 내장함수 구현

구현 목록 memset bzeromemcpymemccpymemmovememchrmemcmpstrlenstrlcpystrlcatstrchrstrrchrstrnstrstrncmpatoiisalphaisdigitisalnumisasciiisprinttouppertolowe

The bzero() function writes n zeroed bytes to the string s. If n is zero, bzero() does nothing.

The memcpy() function copies n bytes from memory area src to memory area dst. 메모리 영역이 겹치면 안됨 -> 겹칠 경우는 memmove 사용

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

The memmove() function copies len bytes from string src to string dst. The two strings may overlap; the copy is always done in a non-destructive mann

The memchr() function locates the first occurrence of c (converted to an unsigned char) in string s.

The strlen() function computes the length of the string s. The strnlen() function attempts to compute the length of s, but never scans beyond the fir

The memcmp() function compares byte string s1 against byte string s2. Both strings are assumed to be n bytes long.