str.hpp

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00001 /* $Id: str.hpp 17248 2009-08-21 20:21:05Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #ifndef  STR_HPP
00013 #define  STR_HPP
00014 
00015 #include <errno.h>
00016 #include <stdarg.h>
00017 #include "../string_func.h"
00018 
00020 struct CStrA : public CBlobT<char>
00021 {
00022   typedef CBlobT<char> base;                    
00023 
00025   FORCEINLINE CStrA()
00026   {
00027   }
00028 
00030   FORCEINLINE CStrA(const OnTransfer& ot)
00031     : base(ot)
00032   {
00033   }
00034 
00036   FORCEINLINE char *GrowSizeNC(bsize_t count)
00037   {
00038     char *ret = base::GrowSizeNC(count);
00039     base::FixTail();
00040     return ret;
00041   }
00042 
00044   FORCEINLINE void AppendStr(const char *str)
00045   {
00046     if (!StrEmpty(str)) {
00047       base::Append(str, strlen(str));
00048       base::FixTail();
00049     }
00050   }
00051 
00053   FORCEINLINE CStrA& operator = (const char *src)
00054   {
00055     base::Clear();
00056     AppendStr(src);
00057     return *this;
00058   }
00059 
00061   FORCEINLINE bool operator < (const CStrA &other) const
00062   {
00063     return strcmp(base::Data(), other.Data()) < 0;
00064   }
00065 
00067   int AddFormatL(const char *format, va_list args)
00068   {
00069     bsize_t addSize = max<size_t>(strlen(format), 16);
00070     addSize += addSize / 2;
00071     int ret;
00072     int err = 0;
00073     for (;;) {
00074       char *buf = MakeFreeSpace(addSize);
00075       ret = vsnprintf(buf, base::GetReserve(), format, args);
00076       if (ret >= base::GetReserve()) {
00077         /* Greater return than given count means needed buffer size. */
00078         addSize = ret + 1;
00079         continue;
00080       }
00081       if (ret >= 0) {
00082         /* success */
00083         break;
00084       }
00085       err = errno;
00086       if (err != ERANGE && err != ENOENT && err != 0) {
00087         /* some strange failure */
00088         break;
00089       }
00090       /* small buffer (M$ implementation) */
00091       addSize *= 2;
00092     }
00093     if (ret > 0) {
00094       GrowSizeNC(ret);
00095     } else {
00096       base::FixTail();
00097     }
00098     return ret;
00099   }
00100 
00102   int AddFormat(const char *format, ...)
00103   {
00104     va_list args;
00105     va_start(args, format);
00106     int ret = AddFormatL(format, args);
00107     va_end(args);
00108     return ret;
00109   }
00110 
00112   int Format(const char *format, ...)
00113   {
00114     base::Free();
00115     va_list args;
00116     va_start(args, format);
00117     int ret = AddFormatL(format, args);
00118     va_end(args);
00119     return ret;
00120   }
00121 };
00122 
00123 #endif /* STR_HPP */

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