用法： strtok(char* str, const char* split);
p = strtok(s4, split);
while(p != NULL){
printf("%s\n", p);
p = strtok(NULL, split);
}
吐槽一番：拿到一个字符串就一直霸占着不放，还要手动添加循环进行token。。还要修改string的值，而且不读源码根本不会知道正确的使用姿势。。遇到还是自己写吧。。
以下源码转自博客：
char * __cdecl strtok (
char * string,
const char * control
)
{
unsigned char *str;
const unsigned char *ctrl = control;
unsigned char map[32];
int count;
static char *nextoken;
/* Clear control map */
for (count = 0; count < 32; count++)
map[count] = 0;
/* Set bits in delimiter table */
do {
map[*ctrl >> 3] |= (1 << (*ctrl & 7));
} while (*ctrl++);
if (string)
str = string;
else
str = nextoken;
/* Find beginning of token (skip over leading delimiters). Note that
* there is no token iff this loop sets str to point to the terminal
* null (*str == '\0') */
while ( (map[*str >> 3] & (1 << (*str & 7))) && *str )
str++;
string = str;
/* Find the end of the token. If it is not the end of the string,
* put a null there. */
for ( ; *str ; str++ )
if ( map[*str >> 3] & (1 << (*str & 7)) ) {
*str++ = '\0';
break;
}
nextoken = str;
if ( string == str )
return NULL;
else
return string;
}
