using namespace std;

#include <string>
#include <stdlib.h>     /* for getenv() */
#include <string.h>     /* for strerror_r */
#include "strlib.h"
#include <errno.h>
#include <stdio.h>      /* for snprintf() */

string ltrim(const string foo, const string strip){
  size_t where = foo.find_first_not_of(strip);
  if (where == foo.npos) return foo;
  return foo.substr(where);
}

string rtrim(const string foo, const string strip){
  size_t where = foo.find_last_not_of(strip);
  if (where == foo.npos) return "";
  return foo.substr(0, where+1);
}

string trim(const string foo, const string bar){
  return ltrim(rtrim(foo, bar), bar);
}

string Getenv(const string foo, const string dflt){
  char* bar = getenv(foo.c_str());
  if (!bar) return dflt;
  return bar;
}

string Strerror(const int errcode){
  const int sz(100);
  char buf[sz];

  char* rslt = strerror_r(errcode, buf, sz);
  if (rslt) return buf;

  snprintf(buf, 20, "%19d", errcode);
  return string("unknown error code: ") + buf;
}

string Strerror(){
  return strerror(errno);
}