memchr.c

[詳解]

 
#include <string.h>
 
void* memchr(const void* buf, int c, size_t n)
{
  const unsigned char* s = (const unsigned char*) buf;
 
  while (n--)
  {
    if (*s == (unsigned char)c)
    {
      return (void*)s;
    }
    s++;
  }
 
  return NULL;
}