unit1.h

网络编程的一些实例

//---------------------------------------------------------------------------
#ifndef Unit1H
#define Unit1H
//---------------------------------------------------------------------------
#define must_encode(c)  !isalnum(c)
#ifndef _ASCII_non_Portable_
#   define X2C(x)   ((x) >= 'A' ? (((x) & 0xDF) - 'A')+10 : ((x) - '0'))
#else
    const char xc[] = "0123456789ABCDEF";
    const char xv[] = { 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15 };
#   define X2C(x)   xv[strcdx(xc,toupper(x))]
#endif

static char x2c(char *hex);
char* str2url(char *buf, char *str);
char* url2str(char *url);
#endif