pipe to less

#include <stdio.h>
#include <stdlib.h>


void write_data(FILE *stream) {
    int i;

    for (i = 0; i < 100; ++i) {
        fprintf(stream, "%d\n", i);
    }

    if (ferror(stream)) {
        fprintf(stderr, "Output to stream failed.\n");
        exit(-1);
    }

    fclose(stream);
}

int main() {
    FILE *output;
    output = popen("less", "w");

    if (!output) {
        fprintf(stderr, "Incorrect parameters or too many files.\n");
        exit(-1);
    }

    write_data(output);

    if (pclose(output) != 0) {
        fprintf(stderr, "Could not run more or other error.\n");
    }

    return 0;
}