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Member "encfs-1.9.5/encfs/autosprintf.cpp" (27 Apr 2018, 2361 Bytes) of package /linux/misc/encfs-1.9.5.tar.gz:

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    1 /* Class autosprintf - formatted output to an ostream.
    2    Copyright (C) 2002 Free Software Foundation, Inc.
    3    Written by Bruno Haible <bruno@clisp.org>, 2002.
    4 
    5    This program is free software: you can redistribute it and/or modify
    6    it under the terms of the GNU Library General Public License as published by
    7    the Free Software Foundation; either version 2 of the License, or
    8    (at your option) any later version.
    9 
   10    This program is distributed in the hope that it will be useful,
   11    but WITHOUT ANY WARRANTY; without even the implied warranty of
   12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   13    GNU Library General Public License for more details.
   14 
   15    You should have received a copy of the GNU Library General Public License
   16    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
   17 
   18 /* Tell glibc's <stdio.h> to provide a prototype for vasprintf().
   19    This must come before <config.h> because <config.h> may include
   20    <features.h>, and once <features.h> has been included, it's too late.  */
   21 #ifndef _GNU_SOURCE
   22 #define _GNU_SOURCE 1
   23 #endif
   24 
   25 /* Specification.  */
   26 #include "autosprintf.h"
   27 
   28 #include <cstdarg>  // for va_list
   29 #include <cstdio>   // for NULL, vasprintf
   30 #include <cstdlib>  // for free
   31 #include <cstring>  // for strdup
   32 
   33 namespace gnu {
   34 
   35 /* Constructor: takes a format string and the printf arguments.  */
   36 autosprintf::autosprintf(const char *format, ...) { // NOLINT (cert-dcl50-cpp) as it's not critical
   37   va_list args;
   38   va_start(args, format);
   39   if (vasprintf(&str, format, args) < 0) {
   40     str = nullptr;
   41   }
   42   va_end(args);
   43 }
   44 
   45 /* Copy constructor.  Necessary because the destructor is nontrivial.  */
   46 autosprintf::autosprintf(const autosprintf &src) {
   47   str = (src.str != nullptr ? strdup(src.str) : nullptr);
   48 }
   49 
   50 /* Destructor: frees the temporarily allocated string.  */
   51 autosprintf::~autosprintf() {
   52   free(str); // NOLINT (cppcoreguidelines-no-malloc) as it's a consequence of vasprintf / variadic function above
   53 }
   54 
   55 /* Conversion to string.  */
   56 autosprintf::operator char *() const {
   57   if (str != nullptr) {
   58     size_t length = strlen(str) + 1;
   59     auto *copy = new char[length];
   60     memcpy(copy, str, length);
   61     return copy;
   62   }
   63   return nullptr;
   64 }
   65 autosprintf::operator std::string() const {
   66   return std::string(str != nullptr ? str : "(error in autosprintf)");
   67 }
   68 }  // namespace gnu