xpcom/string/src/nsPrintfCString.cpp
author Benjamin Smedberg <benjamin@smedbergs.us>
Tue, 15 Apr 2008 13:59:01 -0400
changeset 14343 40e4b99f0deaca3707d6993229b1476ad4527c95
parent 1 9b2a99adc05e53cd4010de512f50118594756650
child 35028 a80fb8f5552f29c138b11e30f9ebb5b713684eb5
permissions -rwxr-xr-x
Merge cvs-trunk-mirror to mozilla-central.

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
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#include "nsPrintfCString.h"
#include <stdarg.h>
#include "prprf.h"


// though these classes define a fixed buffer, they do not set the F_FIXED
// flag.  this is because they are not intended to be modified after they have
// been constructed.  we could change this but it would require adding a new
// class to the hierarchy, one that both this class and nsCAutoString would
// inherit from.  for now, we populate the fixed buffer, and then let the
// nsCString code treat the buffer as if it were a dependent buffer.

nsPrintfCString::nsPrintfCString( const char_type* format, ... )
  : string_type(mLocalBuffer, 0, F_TERMINATED)
  {
    va_list ap;

    size_type logical_capacity = kLocalBufferSize;
    size_type physical_capacity = logical_capacity + 1;

    va_start(ap, format);
    mLength = PR_vsnprintf(mData, physical_capacity, format, ap);
    va_end(ap);
  }

nsPrintfCString::nsPrintfCString( size_type n, const char_type* format, ... )
  : string_type(mLocalBuffer, 0, F_TERMINATED)
  {
    va_list ap;

      // make sure there's at least |n| space
    size_type logical_capacity = kLocalBufferSize;
    if ( n > logical_capacity )
      {
        SetCapacity(n);
        if (Capacity() < n)
          return; // out of memory !!
        logical_capacity = n;
      }
    size_type physical_capacity = logical_capacity + 1;

    va_start(ap, format);
    mLength = PR_vsnprintf(mData, physical_capacity, format, ap);
    va_end(ap);
  }