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 contain
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 );
}
}
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 < (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)