Src/DasherCore/Messages.cpp

   1 #include "Messages.h"
   2 #include <string.h>
   3 #include <vector>
   4 #include <stdarg.h>
   5 #include <stdio.h>
   6
   7 using std::vector;
   8
   9 void CMessageDisplay::FormatMessageWithString(const char *fmt, const char *str) {
  10   char *buf(new char[strlen(fmt)+strlen(str)]);
  11   sprintf(buf, fmt, str);
  12   Message(buf, true);
  13   delete[] buf;
  14 }
  15
  16 void CMessageDisplay::FormatMessageWith2Strings(const char *fmt, const char *str1, const char *str2) {
  17   char *buf(new char[strlen(fmt)+strlen(str1)+strlen(str2)]);
  18   sprintf(buf, fmt, str1, str2);
  19   Message(buf,true);
  20   delete[] buf;
  21 }
  22
  23   //The following implements a varargs version of the above,
  24   // dynamically allocating enough storage for the formatted string
  25   // using snprintf. However, this doesn't work on Solaris,
  26   // hence commenting out.
  27
  28   //Note: vector is guaranteed to store elements contiguously.
  29   // C++98 did not guarantee this, but this was corrected in a 2003
  30   // technical corrigendum. As Bjarne Stroustrup says,
  31   // "this was always the intent and all implementations always did it that way"
  32   /*vector<char> buf;
  33   for (int len = strlen(fmt)+1024; ;) {
  34     buf.resize(len);
  35     va_list args;
  36     va_start(args,fmt);
  37     int res = vsnprintf(&buf[0], len, fmt, args);
  38     va_end(args);
  39     if (res>=0 && res<len) {
  40       //ok, buf big enough, now contains string
  41       Message(&buf[0], true);
  42       return;
  43     }
  44     if (res<0) {
  45       //on windows, returns -1 for "buffer not big enough" => double size & retry.
  46       // However, on linux, -1 indicates "some other error".
  47       // So make sure we don't infinite loop but instead break out somehow...
  48       if (len*=2 > 1<<16) {
  49         printf("Could not allocate big enough buffer, or other error, when trying to print:\n");
  50         va_list args2;
  51         va_start(args2,fmt);
  52         vprintf(fmt,args2);
  53         va_end(args2);
  54         return; //exit loop + function, no call to Message()
  55       }
  56     } else len = res+1; //that identifies necessary size of buffer
  57   }*/