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#include <stdio.h>
char *buffer = NULL;
size_t size1, size2;
FILE *filedes;

/*
 * Assume size1 and size2 are appropriately initialized
 */

filedes = fopen("out.txt", "w+");
if (filedes == NULL) {
  /* Handle error */
}

buffer = (char *)calloc(sizeof(char) 1, size1);
if (buffer == NULL) {
  /* Handle error */
}

fwrite(buffer, sizeof(char)1, size2, filedes);

free(buffer);
buffer = NULL;
fclose(filedes);

char *buffer = NULL;
size_t size1, size2;
FILE *filedes;

/*
 * Assume size1 is appropriately initialized
 */

filedes = fopen("out.txt", "w+");
if (filedes == NULL){
  /* Handle error */
}

buffer = (char *)calloc(sizeof(char) 1, size1);
if (buffer == NULL) {
  /* Handle error */
}

/*
 * Accept characters in to the buffer
 * Check for buffer overflow
 */

size2 = strlen(buffer) + 1;

fwrite(buffer, sizeof(char)1, size2, filedes);

free(buffer);
buffer = NULL;
fclose(filedes);