Readline C

readline.c

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(int argc, char *argv[])
{
    char *line = NULL;
    size_t len = 0;
    ssize_t read;

    while ((read = getline(&line, &len, stdin)) != -1) {
        printf("Retrieved line of length %zu :\n", read);
        printf("%s", line);
        line[read-1] = 0;

        char **res  = NULL;
        char *p = strtok(line, " ");
        int n_spaces = 0, i;

        res = realloc(res, sizeof (char*) * ++n_spaces);
        res[0] = argv[0];
        // 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, " ");
        }

        // print the result
        for (i = 0; i < n_spaces; ++i) {
            printf("token[%d] = %s\n", i, res[i]);
        }

        // free the memory allocated
        free(res);
    }

    if (line) {
        free(line);
    }
    exit(EXIT_SUCCESS);
}