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1 /************************************************************************************
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2
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3 Filename : OVR_String_FormatUtil.cpp
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4 Content : String format functions.
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5 Created : February 27, 2013
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6 Notes :
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7
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8 Copyright : Copyright 2014 Oculus VR, LLC All Rights reserved.
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9
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10 Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");
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11 you may not use the Oculus VR Rift SDK except in compliance with the License,
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12 which is provided at the time of installation or download, or which
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13 otherwise accompanies this software in either electronic or hard copy form.
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14
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15 You may obtain a copy of the License at
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16
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17 http://www.oculusvr.com/licenses/LICENSE-3.2
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18
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19 Unless required by applicable law or agreed to in writing, the Oculus VR SDK
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20 distributed under the License is distributed on an "AS IS" BASIS,
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21 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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22 See the License for the specific language governing permissions and
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23 limitations under the License.
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24
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25 ************************************************************************************/
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26
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27 #include "OVR_String.h"
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28 #include "OVR_Log.h"
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29
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30 namespace OVR {
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31
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32 void StringBuffer::AppendFormat(const char* format, ...)
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33 {
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34 va_list argList;
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35 char buffer[512];
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36 char* bufferUsed = buffer;
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37 char* bufferAllocated = NULL;
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38
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39 va_start(argList, format);
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40
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41 #if !defined(OVR_CC_MSVC) // Non-Microsoft compilers require you to save a copy of the va_list.
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42 va_list argListSaved;
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43 va_copy(argListSaved, argList);
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44 #endif
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45
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46 int requiredStrlen = OVR_vsnprintf(bufferUsed, OVR_ARRAY_COUNT(buffer), format, argList); // The large majority of the time this will succeed.
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47
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48 if(requiredStrlen >= (int)sizeof(buffer)) // If the initial capacity wasn't enough...
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49 {
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50 bufferAllocated = (char*)OVR_ALLOC(sizeof(char) * (requiredStrlen + 1));
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51 bufferUsed = bufferAllocated;
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52 if(bufferAllocated)
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53 {
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54 #if !defined(OVR_CC_MSVC)
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55 va_end(argList);
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56 va_copy(argList, argListSaved);
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57 #endif
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58 requiredStrlen = OVR_vsnprintf(bufferAllocated, (requiredStrlen + 1), format, argList);
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59 }
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60 }
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61
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62 if(requiredStrlen < 0) // If there was a printf format error...
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63 {
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64 bufferUsed = NULL;
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65 }
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66
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67 va_end(argList);
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68
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69 if(bufferUsed)
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70 AppendString(bufferUsed);
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71
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72 if(bufferAllocated)
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73 OVR_FREE(bufferAllocated);
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74 }
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75
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76 } // OVR
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