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lightning-sunbird  0.9+nobinonly
nsPrintfCString.cpp
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00038 
00039 #include "nsPrintfCString.h"
00040 #include <stdarg.h>
00041 #include "prprf.h"
00042 
00043 
00044 // though these classes define a fixed buffer, they do not set the F_FIXED
00045 // flag.  this is because they are not intended to be modified after they have
00046 // been constructed.  we could change this but it would require adding a new
00047 // class to the hierarchy, one that both this class and nsCAutoString would
00048 // inherit from.  for now, we populate the fixed buffer, and then let the
00049 // nsCString code treat the buffer as if it were a dependent buffer.
00050 
00051 nsPrintfCString::nsPrintfCString( const char_type* format, ... )
00052   : string_type(mLocalBuffer, 0, F_TERMINATED)
00053   {
00054     va_list ap;
00055 
00056     size_type logical_capacity = kLocalBufferSize;
00057     size_type physical_capacity = logical_capacity + 1;
00058 
00059     va_start(ap, format);
00060     mLength = PR_vsnprintf(mData, physical_capacity, format, ap);
00061     va_end(ap);
00062   }
00063 
00064 nsPrintfCString::nsPrintfCString( size_type n, const char_type* format, ... )
00065   : string_type(mLocalBuffer, 0, F_TERMINATED)
00066   {
00067     va_list ap;
00068 
00069       // make sure there's at least |n| space
00070     size_type logical_capacity = kLocalBufferSize;
00071     if ( n > logical_capacity )
00072       {
00073         SetCapacity(n);
00074         if (Capacity() < n)
00075           return; // out of memory !!
00076         logical_capacity = n;
00077       }
00078     size_type physical_capacity = logical_capacity + 1;
00079 
00080     va_start(ap, format);
00081     mLength = PR_vsnprintf(mData, physical_capacity, format, ap);
00082     va_end(ap);
00083   }