I want to split a string into two strings in C - c

Question

I want to split a string by the comma and separate the first number in the string into its own new string, the rest of the string I want to keep together.
So far I have tried this by using strtok() and I can get the first number into its own string, but now I can't figure out how to keep the rest of the string together.
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char *argv[])
{
char testStr[] = "1000,first,second,third,+abc";
char *uidStr;
char *restOfstr;
int n;
//This is wrong, I know, but I want to populate
//the rest of the string after the first comma
//into a single string without the UID.
uidStr = strtok(testStr, ",");
while (n < 5)
{
restOfstr = strtok(NULL, ",");
n++;
}
return 0;
}

Answer 1

strtok works fine, you have to keep in mind that it returns a pointer to each tokenized word so you need two pointers one for the first token and other for the rest of the string.
Demo
#include <stdio.h>
#include <string.h>
int main()
{
char testStr[] = "1000,first,second,third,+abc";
char *uidStr; //pointer to uid
char *restOfstr; //pointers to the rest of the string
uidStr = strtok(testStr, ","); //uid remains in testStr
restOfstr = strtok(NULL, "\n"); //rest of the string
puts(uidStr); //or puts(testStr) to print uid
puts(restOfstr); //print rest of the string
return 0;
}
If you want a more secure function you can use strtok_s.

Answer 2

You can use strchr to find the first comma in the string.
Then using strncpy to get the number in the string.
The complete code:
#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
char *str = "1000,first,second,third,+abc";
char *s = strchr(str, ',');
if(!s)
return -1;
char num[10];
strncpy(num, str, s-str);
num[s-str] = '\0';
int a = strtol(num, NULL, 10);
printf("num = %d\nthe remaining: %s\n", a, s+1);
return 0;
}

Answer 3

#include <string.h>
#include <stdio.h>
int main(int ac, char **av) {
while (--ac) {
char *p = *++av;
char *t = strtok(p, ",");
char *r = strtok(NULL,"");
printf("%s : %s\n", t, r);
}
return 0;
}
Note that the empty string "" passed to the second strtok means that it cannot find a deliminator, thus returns the rest of the string.

Answer 4

In addition to the excellent answers #mevets and #anastaciu have provided (I would go with these), this code will also work fine.
#include <string.h>
#include <stdio.h>
int main(int argc, char** argv) {
char _p[] = "1000,Hey,There";
char* str1 = strtok(_p, ",");
char* str2 = strtok(NULL, "");
return 0;
}