count.c

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/*
 * Copyright (C) 2011 Felix Fietkau <nbd@openwrt.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
 
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include "count.h"
 
char *count_to_number(uint32_t num)
{
        uint32_t ptr = 0, size = 0;
        uint32_t written = 0, i;
        int new_line_every_n_numbers = 30;
        char *s;
 
        for (i=0; i < num; ++i) {
                size += snprintf(NULL, 0, "%u ", i);
                if (i > 0 && i % new_line_every_n_numbers == 0)
                        size++;
        }
        size++; /* one for null char */
 
        s = calloc(size, sizeof(char));
        if (!s)
                goto out;
 
        for (i=0; i < num; ++i) {
                written = sprintf(&s[ptr], "%u ", i);
                ptr  += written;
                if (i > 0 && i % new_line_every_n_numbers == 0) {
                        sprintf(&s[ptr], "\n");
                        ptr++;
                }
        }
 
out:
        return s;
}