C - split string into an array of strings

Question

I m not completely sure how to do this in C    char  curToken   strtok string          curToken    ls -l  we will say   I need a array of strings containing  ls    -l   and NULL for execvp     How would I go about doing this

User · Answer

Here is an example of how to use strtok borrowed from MSDN.

And the relevant bits, you need to call it multiple times. The token char* is the part you would stuff into an array (you can figure that part out).

char string[] = "A string\tof ,,tokens\nand some  more tokens";
char seps[]   = " ,\t\n";
char *token;

int main( void )
{
    printf( "Tokens:\n" );
    /* Establish string and get the first token: */
    token = strtok( string, seps );
    while( token != NULL )
    {
        /* While there are tokens in "string" */
        printf( " %s\n", token );
        /* Get next token: */
        token = strtok( NULL, seps );
    }
}

User · Answer

Since you ve already looked into strtok just continue down the same path and split your string using space       as a delimiter  then use something as realloc to increase the size of the array containing the elements to be passed to execvp   See the below example  but keep in mind that strtok will modify the string passed to it  If you don t want this to happen you are required to make a copy of the original string  using strcpy or similar function   char    str     ls -l   char    res    NULL  char    p      strtok  str        int n spaces   0  i       split string and append tokens to  res      while  p      res   realloc  res  sizeof  char       n spaces      if  res    NULL      exit  -1      memory allocation failed       res n spaces-1    p     p   strtok  NULL              realloc one extra element for the last NULL     res   realloc  res  sizeof  char      n spaces 1    res n spaces    0      print the result     for  i   0  i  lt   n spaces 1     i    printf   res  d     s n   i  res i        free the memory allocated     free  res        res 0    ls res 1    -l res 2     null

[c] C - split string into an array of strings

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