How to use Strtok for tokenizing a Const char*?

问题

I have a const char* variable which may have a value like "OpenStack:OpenStack1". I want to tokenize this const char* using strtok where the delimiter(which is of a const char* type) is ":" . But the problem is strtok is of following type: char * strtok ( char * str, const char * delimiters );

Which means I can't use const char* for the first input as it has to be char*. Could you say me how I can convert this const char* into char*?

Thank you.

回答1:

Since strtok actually writes to your string, you need to make a writable copy of it to tokenize;

char* copy = strdup(myReadonlyString);
...tokenize copy...
free(copy);

回答2:

Declare it as an array:

char tokenedStr[] = "OpenStack:OpenStack1";

if not possible, copy it to a char array.

回答3:

You can make a copy of your non-modifiable string and then use strtok.

You can portably use malloc and strcpy to copy the string.

来源：https://stackoverflow.com/questions/10281712/how-to-use-strtok-for-tokenizing-a-const-char