how to tokenize string to array of int in c?

Question

Anyone got anything about reading a sequential number from text file per line and parsing it to an array in C?

What I have in a file:

12 3 45 6 7 8
3         


        

Answer 1

Use strtol() to parse each line:

#include 
#include 
#include 

int main(void)
{
    static char buffer[1024];
    static long values[256];

    while(fgets(buffer, sizeof buffer, stdin))
    {
        char *current = buffer;
        size_t i = 0;
        while(*current && *current != '\n' &&
            i < sizeof values / sizeof *values)
        {
            char *tail = NULL;
            errno = 0;
            values[i] = strtol(current, &tail, 0);

            if(errno || tail == current)
            {
                fprintf(stderr, "failed to parse %s\n", current);
                break;
            }

            ++i, current = tail;
        }

        // process values
        printf("read %i values\n", i);
    }
}