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

char *read_file(char *fname)
{
    FILE *fp;
    size_t filesize;
    char *buff;

    fp = fopen(fname, "rb");
    fseek(fp, 0, SEEK_END);
    filesize = ftell(fp);
    buff = (char *)calloc(1, filesize + 1);
    buff[filesize] = '\0';
    fseek(fp, 0, SEEK_SET);
    fread(buff, filesize, 1, fp);
    fclose(fp);

    return buff;
}

int main(int argc, char **argv)
{
    char *buff;
    char **index = 0;
    char **p;
    char *token;
    int count = 0;

    buff = read_file(argv[1]);

    token = strtok(buff, "\n");
    while (token) {
        count++;
        index = (char **)realloc(index, (count + 1) * sizeof(*index));
        if (count == 1) {
            index[0] = 0;
        }
        index[count] = 0;
        for (p = index; *p && strcmp(token, *p) > 0; p++) ;
        memmove(p + 1, p, (index + count - p) * sizeof(*p));
        *p = token;

        token = strtok(NULL, "\n");
    }
    index[count] = 0;

    p = index;
    while (*p) {
        printf("%s\n", *p++);
    }

    free(index);
    free(buff);

    return 0;
}