54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
// Copyright 2022 Dietrich Epp.
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// This file is part of SyncFiles. SyncFiles is licensed under the terms of the
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// Mozilla Public License, version 2.0. See LICENSE.txt for details.
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#include "tempfile.h"
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#include <string.h>
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// Filename prefix for temporary files.
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static const char kTempPrefix[] = "SyncFiles.";
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// Hexadecimal digits.
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static const char kHexDigits[16] = {'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
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static void U32ToHex(unsigned char *ptr, UInt32 x)
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{
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int i;
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for (i = 0; i < 8; i++) {
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ptr[7 - i] = kHexDigits[x & 15];
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x >>= 4;
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}
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}
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OSErr MakeTempFile(short vRefNum, FSSpec *spec)
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{
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short tempVRefNum;
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long tempParID;
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unsigned long time;
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OSErr err;
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int pos;
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unsigned char name[32];
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// This is inspired by IM: Files listing 1-10, page 1-25.
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// Generate hopefully unique name.
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GetDateTime(&time);
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memcpy(name + 1, kTempPrefix, sizeof(kTempPrefix) - 1);
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pos = sizeof(kTempPrefix);
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U32ToHex(name + pos, time);
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pos += 8;
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name[0] = pos - 1;
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err = FindFolder(vRefNum, kTemporaryFolderType, TRUE, &tempVRefNum,
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&tempParID);
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if (err != noErr) {
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return err;
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}
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err = FSMakeFSSpec(tempVRefNum, tempParID, name, spec);
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if (err != noErr && err != fnfErr) {
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return err;
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}
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return noErr;
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}
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