99 bottles in english

/* Task: Generate the lyrics to 99 bottles.
 * I decided to challenge myself and make it spell out the numbers, which proved to be a very interesting challenge.
 * Because of the elegant way the versing is handled, this could be translated to a spanish version by merely changing the dictionaries and the verses.
 * In fact, I'll do that right now. Google Translate, ahoy!
 * -Braden
 */

#include <stdio.h>
#include <string.h>

#define VERSE_1 "%s bottle%s of beer on the wall, %s bottle%s of beer.\n"
#define VERSE_2 "Take one down, pass it around, %s bottle%s of beer on the wall.\n\n"
#define VERSE_3 "No more bottles of beer on the wall, no more bottles of beer.\n"
#define VERSE_4 "Go to the store, buy some more, ninety-nine bottles of beer on the wall.\n"
#define SEPARATOR "-"

const char *ones_dict[] = {"no more", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};
const char *tens_dict[] = {0, 0, "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"};
const char *teens_dict[] = {"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"};

void to_english(char *buf, int bottles);
int plural(int qty);
void write_verse(int bottles);

void
to_english(char *buf, int bottles)
{/*{{{*/
    int ones = bottles % 10,
        tens = (bottles - ones) / 10;

    if(bottles == 0){
        strncpy(buf, ones_dict[0], 30);
    } else if(tens == 0){
        strncpy(buf, ones_dict[ones], 30);
    } else if(tens == 1){
        strncpy(buf, teens_dict[ones], 30);
    } else if(ones == 0){
        strncpy(buf, tens_dict[tens], 30);
    } else {
        snprintf(buf, 30, "%s" SEPARATOR "%s", tens_dict[tens], ones_dict[ones]);
    }
}/*}}}*/

int
plural(int qty)
{/*{{{*/
    return qty != 1;
}/*}}}*/

void
write_verse(int bottles)
{/*{{{*/
    char numbuf[30] = "";

    to_english(numbuf, bottles);
    printf(VERSE_1, numbuf, plural(bottles) ? "s" : "", numbuf, plural(bottles) ? "s" : "");

    to_english(numbuf, bottles - 1);
    printf(VERSE_2, numbuf, plural(bottles - 1) ? "s" : "");

    if(bottles - 1 == 0){
        printf(VERSE_3 VERSE_4);
    }
}/*}}}*/

int
main()
{/*{{{*/
    int bottles = 99;

    while(bottles){
        write_verse(bottles);
        bottles--;
    }
}/*}}}*/