Thread: C library to download files

I have written a program that prints current temperature in my city, but it uses the cURL program to download an html page that contains temperature. I do not want a user of my program to download any additional programs. So please suggest me a C library to download files.

Code:

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


int main (void)
{
    system ("curl -o weather.txt http://foreca.com/Russia/Saint_petersburg.html");
    /* download page we will later get weather from */
    FILE* weather = fopen ("weather.txt", "r"); /* open weather weather.txt */
    int temperature; /* variable to store temperature */
    int character; /* variable to store current character */
    char temperature_string [30] = " "; /* to store the string we will be later get temperature from */
    while (character != EOF) /* while character != EOF */
    {
        if (character == (int)'l')
        {                            
            character = fgetc (weather);
            if (character == (int)'a')
            {
                character = fgetc (weather);
                if (character == (int)'r')
                {
                    character = fgetc (weather);
                    if (character == (int)'g')
                    {
                        int counter = 1; /* counter */
                        while (counter <= 11)
                        {
                            fgetc (weather);
                            counter = (counter + 1);
                        }
                        counter = 1;
                        char ad_str [2] = " ";
                        while (counter <= 4)
                        {
                            character = fgetc (weather); /* get new character from file */
                            ad_str[0] = character;
                            strcat (temperature_string, ad_str); /* concatenate temperature_string and ad_str */
                            counter = (counter + 1); /* counter++ */
                        }
                    }
                }
            }
        }
        character = fgetc (weather);
    }
    fclose (weather); /* close the file weather.txt */
    remove ("weather.txt"); /* remove the file weather.txt */
    temperature = atoi (temperature_string); /* convert str_temperature string to int and assing result to the temperature variable */
    printf ("%i%cC in St. Petersburg, Russia", temperature, (char)248);
    /* (char)248 is degree symbol */
    return 0;
}