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  fix putenv (René Rebe, Thomas Ogrisegg)

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

#include <dietwarning.h>
link_warning("setenv","setenv calls malloc.  Avoid it in small programs.");

int setenv(const char *name, const char *value, int overwrite) {
  if (getenv(name)) {
    if (!overwrite) return 0;
    unsetenv(name);
  }
  {
    char *c=malloc(strlen(name)+strlen(value)+2);
    strcpy(c,name);
    strcat(c,"=");
    strcat(c,value);
    return putenv(c);
  }
}