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00013 #ifndef PQXX_UTIL_H
00014 #define PQXX_UTIL_H
00015
00016 #include "pqxx/compiler.h"
00017
00018 #include <cstdio>
00019 #include <stdexcept>
00020 #include <string>
00021 #include <typeinfo>
00022
00023 extern "C"
00024 {
00025 #include "libpq-fe.h"
00026 }
00027
00028
00029 namespace pqxx
00030 {
00031 typedef long Result_size_type;
00032 typedef int Tuple_size_type;
00033
00036 template<typename T> inline const char *FmtString(T);
00037
00038
00039
00040
00041 template<> inline const char *FmtString(short) { return "%hd"; }
00042 template<> inline const char *FmtString(unsigned short){ return "%hu"; }
00043 template<> inline const char *FmtString(int) { return "%i"; }
00044 template<> inline const char *FmtString(long) { return "%li"; }
00045 template<> inline const char *FmtString(unsigned) { return "%u"; }
00046 template<> inline const char *FmtString(unsigned long) { return "%lu"; }
00047 template<> inline const char *FmtString(float) { return "%f"; }
00048 template<> inline const char *FmtString(double) { return "%lf"; }
00049 template<> inline const char *FmtString(long double) { return "%Lf"; }
00050 template<> inline const char *FmtString(char) { return "%c"; }
00051 template<> inline const char *FmtString(unsigned char) { return "%c"; }
00052
00053
00055 template<typename T> inline PGSTD::string ToString(const T &Obj)
00056 {
00057
00058 char Buf[500];
00059 sprintf(Buf, FmtString(Obj), Obj);
00060 return PGSTD::string(Buf);
00061 }
00062
00063 template<> inline PGSTD::string ToString(const PGSTD::string &Obj) {return Obj;}
00064 template<> inline PGSTD::string ToString(const char *const &Obj) { return Obj; }
00065 template<> inline PGSTD::string ToString(char *const &Obj) { return Obj; }
00066
00067 template<> inline PGSTD::string ToString(const bool &Obj)
00068 {
00069 return ToString(unsigned(Obj));
00070 }
00071
00072 template<> inline PGSTD::string ToString(const short &Obj)
00073 {
00074 return ToString(int(Obj));
00075 }
00076
00077 template<> inline PGSTD::string ToString(const unsigned short &Obj)
00078 {
00079 return ToString(unsigned(Obj));
00080 }
00081
00082
00083 template<typename T> inline void FromString(const char Str[], T &Obj)
00084 {
00085 if (!Str) throw PGSTD::runtime_error("Attempt to convert NULL string to " +
00086 PGSTD::string(typeid(T).name()));
00087
00088 if (sscanf(Str, FmtString(Obj), &Obj) != 1)
00089 throw PGSTD::runtime_error("Cannot convert value '" +
00090 PGSTD::string(Str) +
00091 "' to " + typeid(T).name());
00092 }
00093
00094
00095 template<> inline void FromString(const char Str[], PGSTD::string &Obj)
00096 {
00097 if (!Str)
00098 throw PGSTD::runtime_error("Attempt to convert NULL C string to C++ "
00099 "string");
00100 Obj = Str;
00101 }
00102
00103
00104 template<> inline void FromString(const char Str[], const char *&Obj)
00105 {
00106 if (!Str)
00107 throw PGSTD::runtime_error("Attempt to read NULL string");
00108 Obj = Str;
00109 }
00110
00111 template<> inline void FromString(const char Str[], bool &Obj)
00112 {
00113 if (!Str)
00114 throw PGSTD::runtime_error("Attempt to read NULL string");
00115
00116 switch (Str[0])
00117 {
00118 case 0:
00119 case 'f':
00120 Obj = false;
00121 break;
00122 case '0':
00123 {
00124 int I;
00125 FromString(Str, I);
00126 Obj = (I != 0);
00127 }
00128 break;
00129 default:
00130 Obj = true;
00131 }
00132 }
00133
00134
00137 template<typename T> PGSTD::string Quote(const T &Obj, bool EmptyIsNull=false);
00138
00139
00141 template<> inline PGSTD::string Quote(const PGSTD::string &Obj,
00142 bool EmptyIsNull)
00143 {
00144 if (EmptyIsNull && Obj.empty()) return "null";
00145
00146 PGSTD::string Result;
00147 Result.reserve(Obj.size() + 2);
00148 Result += "'";
00149
00150 #ifdef HAVE_PQESCAPESTRING
00151
00152 char *const Buf = new char[2*Obj.size() + 1];
00153 try
00154 {
00155 PQescapeString(Buf, Obj.c_str(), Obj.size());
00156 Result += Buf;
00157 }
00158 catch (const PGSTD::exception &)
00159 {
00160 delete [] Buf;
00161 throw;
00162 }
00163 delete [] Buf;
00164
00165 #else
00166
00167 for (PGSTD::string::size_type i=0; i < Obj.size(); ++i)
00168 {
00169 if (isgraph(Obj[i]))
00170 {
00171 switch (Obj[i])
00172 {
00173 case '\'':
00174 case '\\':
00175 Result += '\\';
00176 }
00177 Result += Obj[i];
00178 }
00179 else
00180 {
00181 char s[10];
00182 sprintf(s,
00183 "\\%03o",
00184 static_cast<unsigned int>(static_cast<unsigned char>(Obj[i])));
00185 Result.append(s, 4);
00186 }
00187 }
00188
00189 #endif
00190
00191 return Result + '\'';
00192 }
00193
00194
00197 template<> inline PGSTD::string Quote(const char *const & Obj,
00198 bool EmptyIsNull)
00199 {
00200 if (!Obj) return "null";
00201 return Quote(PGSTD::string(Obj), EmptyIsNull);
00202 }
00203
00204
00206
00211 template<int LEN> inline PGSTD::string Quote(const char (&Obj)[LEN],
00212 bool EmptyIsNull=false)
00213 {
00214 return Quote(PGSTD::string(Obj), EmptyIsNull);
00215 }
00216
00217
00221 template<typename T> inline PGSTD::string Quote(const T &Obj, bool EmptyIsNull)
00222 {
00223 return Quote(ToString(Obj), EmptyIsNull);
00224 }
00225
00226
00227
00229 template<typename T> PGSTD::string Classname(const T *);
00230
00231
00233
00238 template<typename T> class PQAlloc
00239 {
00240 T *m_Obj;
00241 public:
00242 PQAlloc() : m_Obj(0) {}
00243
00245 explicit PQAlloc(T *obj) : m_Obj(obj) {}
00246
00247 ~PQAlloc() { close(); }
00248
00250
00252 PQAlloc &operator=(T *obj) throw ()
00253 {
00254 if (obj != m_Obj)
00255 {
00256 close();
00257 m_Obj = obj;
00258 }
00259 return *this;
00260 }
00261
00263 operator bool() const throw () { return m_Obj != 0; }
00264
00266 bool operator!() const throw () { return !m_Obj; }
00267
00269
00271 T *operator->() const throw (PGSTD::logic_error)
00272 {
00273 if (!m_Obj) throw PGSTD::logic_error("Null pointer dereferenced");
00274 return m_Obj;
00275 }
00276
00278
00280 T &operator*() const throw (PGSTD::logic_error) { return *operator->(); }
00281
00283
00285 T *c_ptr() const throw () { return m_Obj; }
00286
00288 void close() throw () { if (m_Obj) freemem(); m_Obj = 0; }
00289
00290 private:
00291 void freemem() throw ()
00292 {
00293 #ifdef HAVE_PQFREEMEM
00294 PQfreemem(m_Obj);
00295 #else
00296 free(m_Obj);
00297 #endif
00298 }
00299
00300 PQAlloc(const PQAlloc &);
00301 PQAlloc &operator=(const PQAlloc &);
00302 };
00303
00304
00305
00311 template<typename GUEST>
00312 class Unique
00313 {
00314 public:
00315 Unique() : m_Guest(0) {}
00316
00317 GUEST *get() const throw () { return m_Guest; }
00318
00319 void Register(GUEST *G)
00320 {
00321 if (!G) throw PGSTD::logic_error("Internal libpqxx error: NULL " +
00322 Classname(G));
00323
00324 if (m_Guest)
00325 {
00326 if (G == m_Guest)
00327 throw PGSTD::logic_error(Classname(G) +
00328 " '" +
00329 G->Name() +
00330 "' started more than once without closing");
00331
00332 throw PGSTD::logic_error("Started " +
00333 Classname(G) +
00334 " '" +
00335 G->Name() +
00336 "' while '" +
00337 m_Guest->Name() +
00338 "' was still active");
00339 }
00340
00341 m_Guest = G;
00342 }
00343
00344 void Unregister(GUEST *G)
00345 {
00346 if (G != m_Guest)
00347 {
00348 if (!G)
00349 throw PGSTD::logic_error("Closing NULL " + Classname(G));
00350 else if (!m_Guest)
00351 throw PGSTD::logic_error("Closing " +
00352 Classname(G) +
00353 " '" +
00354 G->Name() +
00355 "' which wasn't open");
00356 else
00357 throw PGSTD::logic_error("Closing wrong " +
00358 Classname(G) +
00359 "; expected '" +
00360 m_Guest->Name() +
00361 "' but got '" +
00362 G->Name() +
00363 "'");
00364 }
00365
00366 m_Guest = 0;
00367 }
00368
00369 private:
00370 GUEST *m_Guest;
00371
00372
00373 Unique(const Unique &);
00374 Unique &operator=(const Unique &);
00375 };
00376
00377 }
00378
00379 #endif
00380