C: correct usage of strtok_r

Question

How can I use strtok_r instead of strtok to do this?

char *pchE = strtok(NULL, \" \");

Now I\'m trying to use strtok_r properl

Answer 1

I post a tested example to understand the correct usage of strtok_r() instead of using strtok() in nests.

first lets take a string "y.o.u,a.r.e,h.e.r.e" and separate using the delimiters "," and "."

using strtok()

#include
#include
int main(void) {

        char str[]="y.o.u,a.r.e,h.e.r.e";
        const char *p=",", *q=".";
        char *a,*b;

        for( a=strtok(str,p) ; a!=NULL ; a=strtok(NULL,p) ) {
                printf("%s\n",a);
                for( b=strtok(a,q) ; b!=NULL ; b=strtok(NULL,q) )
                        printf("%s\n",b);
        }

        return 0;
}

OUTPUT:

y.o.u
y
o
u

now lets use strtok_r() for same example

using strtok_r()

#include
#include
int main(void) {

        char str[]="y.o.u,a.r.e,h.e.r.e";
        const char *p=",",*q=".";
        char *a,*b,*c,*d;

        for( a=strtok_r(str,p,&c) ; a!=NULL ; a=strtok_r(NULL,p,&c) ) {
                printf("%s\n",a);

                for( b=strtok_r(a,q,&d) ; b!=NULL ; b=strtok_r(NULL,q,&d) )
                        printf("%s\n",b);
        }

        return 0;
}

OUTPUT:

y.o.u
y
o
u
a.r.e
a
r
e
h.e.r.e
h
e
r
e

therefore the strtok_r() has reentrant property whereas strtok() doesnot function like that.