greenplumn strnlen 源码
greenplumn strnlen 代码
文件路径：/src/port/strnlen.c
/*-------------------------------------------------------------------------
*
* strnlen.c
* Fallback implementation of strnlen().
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/port/strnlen.c
*
*-------------------------------------------------------------------------
*/
#include "c.h"
/*
* Implementation of posix' strnlen for systems where it's not available.
*
* Returns the number of characters before a null-byte in the string pointed
* to by str, unless there's no null-byte before maxlen. In the latter case
* maxlen is returned.
*/
size_t
strnlen(const char *str, size_t maxlen)
{
const char *p = str;
while (maxlen-- > 0 && *p)
p++;
return p - str;
}
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