Zilog Z80380 Instrukcja Użytkownika Pobierz pdf (Strona 74)

Library Functions Run Time Environment

4–10 UM004001-COR1103

memchr FUNCTION

Header file statement: #include <string.h>

Syntax: void *memchr( const void *buf, int c, size_t count )

The memchr function looks for the first occurrence of c in the first count bytes of buf. It

stops when it finds c or when it has checked the first count bytes.

Return Value

If successful, memchr returns a pointer to the first location of c in buf. Otherwise, it returns

NULL.

memcmp FUNCTION

Header file statement: #include <string.h>

Syntax: int memcmp (const void *buf1, const void *buf2, size_t count)

The memcmp function compares the first count bytes of buf1 and buf2 and returns a value

indicating their relationship, as follows:

Value Meaning

< 0 buf1 less than buf2

= 0 buf1 identical to buf2

> 0 buf1 greater than buf2

Return Value

The memcmp function returns an integer value, as described above.

Parameter Description

buf

Pointer to buffer

c Character to look for

count Number of characters

Parameter Description

buf1

First buffer

buf2 Second buffer

count Number of characters

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 115 116

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Zilog Z80380 Instrukcja Użytkownika Strona 74