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

char *ellipsize(unsigned int length, char *string) {
    int i;
    int lastidx = -1;
    char *retString;
    if (strlen(string) > length) {
        for (i = 0; i < length; i++) {
            if (isspace(string[i])) {
                lastidx = i;
            }
        }
        if (lastidx == -1) {
            lastidx = length;
        }
        retString = malloc((length + 4) * sizeof(char));
        strncpy(retString, string, lastidx);
        retString[lastidx] = '\0';
        strcat(retString, "...");
    } else {
        retString = strdup(string);
    }

    return retString;
}

int main(int argc, char **argv) {
    int i;
    char *string;
    unsigned int limit;

    if (argc < 2) {
        printf("Usage:\n");
        printf("\t%s <LIMIT> [STRING]...\n", argv[0]);
    } else {
        if (!sscanf(argv[1], "%u", &limit)) {
            printf("ERROR: Wrong LIMIT argument.\n");
            exit(EXIT_FAILURE);
        }
    }

    for (i = 2; i < argc; i++) {
        string = strdup(argv[i]);
        string[limit] = '\0';
        printf("First %uchars (at most) from the input string: %s\n", limit, string);
        free(string);
        string = ellipsize(limit, argv[i]);
        printf("Ellipsized string: %s\n", string);
        free(string);
    }

    return 0;
}