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#include <png.h> /* From libpng */
#include <string.h>

 void func(png_structp png_ptr, size_t length, const void *user_data) { 
  png_charp chunkdata;
  if (length == SIZE_MAX) {
    /* Handle error */
  }
  chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
  if (NULL == chunkdatauser_data) {
    /* Handle error */
  }
  chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
  if (NULL == user_datachunkdata) {
    /* Handle error */
  }
  /* ... */
  memcpy(chunkdata, user_data, length);
  /* ... */

 }