char getch (void) {
  fflush (stdout);
  char buf;
  struct termios old = {0}, new = {0};
 
  if (tcgetattr (STDIN_FILENO, &old) < 0)
    return -1;
 
  new = old;
 
  new.c_lflag &= ~ICANON;
  new.c_cc[VMIN] = 1;
  new.c_cc[VTIME] = 0;
 
  if (tcsetattr (STDIN_FILENO, TCSANOW, &new) < 0)
    return -1;
 
  if (read (STDIN_FILENO, (char *)&buf, 1) < 0)
    return -1;
 
  if (tcsetattr (STDIN_FILENO, TCSANOW, &old) < 0)
    return -1;
 
  return buf;
}
 
int main () {
  printf ("Introduce un caracter\n");
   int a = getch ();
...
}

char *GetJSession (FILE *sf) {
  size_t s = 0;
  char *buf = NULL;
  char *js = (char *) calloc (256, sizeof (char));
  char *str = (char *) js;
 
  while (getline (&buf, &s, sf) > 0) {
    printf ("%s", buf);
    if (strstr (buf, "JSESSIONID=") != NULL) {
      while (*++buf != '=');
      while (*buf != ';') {
        *str = *buf;
        str++, buf++;
        printf ("%c", *str);
      }
    }
  }
...

*js = *buf;
js++, buf++;

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <curl/curl.h>
 
int main (int argc, char **argv) {
  if (argc < 2)
    return fprintf (stderr, "%s <ua mail>\n", argv[0]);
 
  char *user = argv[1];
  char *pass = getpass ("Contraseña de la UA: ");
  CURL *cSession;
  FILE *sf = fopen ("res.html", "at");
  struct curl_httppost *pData = NULL;
  struct curl_httppost *last = NULL;
 
  curl_formadd (&pData, &last,
    CURLFORM_COPYNAME, "username",
    CURLFORM_COPYCONTENTS, argv[1],
    CURLFORM_END);
  curl_formadd (&pData, &last,
    CURLFORM_COPYNAME, "password",
    CURLFORM_COPYCONTENTS, pass,
    CURLFORM_END);
 
  cSession = curl_easy_init ();
  if ( !cSession ) {
    fprintf (stderr, "Error iniciando cURL\n");
  } else {
    curl_easy_setopt (cSession, CURLOPT_VERBOSE, 1);
    curl_easy_setopt (cSession, CURLOPT_URL, "https://autentica.cpd.ua.es/cas/login?service=https://cvnet.cpd.ua.es/uacloud/home/indexVerificado");
    curl_easy_setopt (cSession, CURLOPT_HTTPPOST, pData);
    curl_easy_setopt (cSession, CURLOPT_FOLLOWLOCATION, 1);
    curl_easy_setopt (cSession, CURLOPT_WRITEDATA, (FILE *)sf);
    curl_easy_setopt (cSession, CURLOPT_USERAGENT, "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.63 Safari/537.31");
 
    if (curl_easy_perform (cSession) != 0) {
      fprintf (stderr, "Error executing cURL session\n");
    } else {
      printf ("Done!\n");
    }
  }
 
  curl_easy_cleanup (cSession);
 
  return 0;
}

int main () {
  int *b = (int *) malloc (sizeof (int));
 
  b[0] = 20;
  realloc (b, 2 * sizeof (int));
  b[1] = 30;
 
  printf ("%d\t%d\n", b[0], b[1]);
 
  return 0;
}

int main () {
  int *a, *b = (int *) malloc (sizeof (int));
 
  b[0] = 20;
  a = (int *)realloc (b, 2 * sizeof (int));
  b[1] = 30;
 
  printf ("%p\n%p\n", &a, &b);
 
  return 0;
}

int main () {
  char *proName = (char *)(calloc (1025, sizeof (char)));
 
  GetModuleFileName ( GetModuleHandle (NULL), proName, 1024);
 
  return !MoveFile (proName, "(carpeta temporal de windows)");
}