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-   -   strtok query (http://www.go4expert.com/forums/strtok-query-t4433/)

rajib 26May2007 15:57

strtok query
When strtok is used and it doesn't find the delimiter when strtok is used the FIRST time, it should return a null. But this doesn't seems to be the behavior. Pl refer to this code -


char*  szInputStr = "string to split up";
char *copy = NULL;

/* Copy the szInputStr to Copy */

len = strlen(szInputStr);
copy = (char *)malloc(len+1);
strcpy(copy, szInputStr);

/* Do strtok */
result = strtok(copy, "~");
if(result == NULL)
printf("result is NULL \n");
printf("result is NOT null \n");

The above code should return NULL - right? Please confirm.

Actually the value is same as the original string - "string to split up". The above code prints -
"result is NOT null"

DaWei 27May2007 02:39

Re: strtok query
No, it should not. Strtok returns a NULL when no more tokens are found. On the first call it found "string to split up". The return will be a pointer to that token, which happens to be the entire input string.

Do yourself a favor: read the documentations for the things you use.

Do us a favor: learn to use the code tags like a big boy. Quit forcing the task on Shabbir.

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