1 // Lukas Lipp
  2 // tea = text einlesen / ausgabe
  3 //
  4 //
  5 #include <stdlib.h>
  6 #include <stdio.h>
  7 #define BLOCKSIZE 10
  8
  9 int resize_memory(char** oldpointer, int newsize) // allocates new memory or frees memory, depending on the new size
 10 {
 11   char* newpointer = realloc(*oldpointer, newsize);
 12   if(newpointer == NULL)
 13   {
 14     free(*oldpointer);
 15     return -1;
 16   }
 17   *oldpointer = newpointer;
 18   return 0;
 19 }
 20
 21 int main(int argc, const char *argv[])
 22 {
 23   char* input = malloc(sizeof(char) * BLOCKSIZE);
 24
 25   int allocatedblocks = 1;
 26   int readchars = 0;
 27   char buffer;
 28
 29   buffer = getchar();
 30   while(buffer != EOF) // reads input until EOF
 31   {
 32     if(readchars >= BLOCKSIZE*allocatedblocks) // allocates new memory if there is currently no memory left for further input
 33     {
 34       if(resize_memory(&input, sizeof(char) * (BLOCKSIZE * (allocatedblocks+1))) == -1) // allocates memory for one more BLOCK of input characters
 35         return -1;
 36       allocatedblocks++;
 37     }
 38     input[readchars] = buffer;
 39     buffer = getchar();
 40     readchars++;
 41   }
 42
 43   if(resize_memory(&input, sizeof(char) * readchars) == -1)
 44     return -1;
 45
 46   int character[25];
 47   int counter = 0;
 48
 49   for(counter = 0; counter < readchars; counter++)
 50   {
 51     character[input[counter]-'a']++;
 52   }
 53