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write_asm.c
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write_asm.c
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#include "stdafx.h"
#include "write_asm.h"
extern OPTIONS options;
#ifdef _WIN64
#define HEXPTR_PADDED _T("%016I64X")
#else // _WIN64
#define HEXPTR_PADDED _T("%08X")
#endif // _WIN64
LONG_PTR WriteAsm(TCHAR *lpText, TCHAR *lpError)
{
LABEL_HEAD label_head = {NULL, (LABEL_NODE *)&label_head};
CMD_BLOCK_HEAD cmd_block_head = {NULL, (CMD_BLOCK_NODE *)&cmd_block_head};
TCHAR *lpErrorSpot;
// Fill the data linked lists using the given text, without replacing labels in commands yet
lpErrorSpot = TextToData(&label_head, &cmd_block_head, lpText, lpError);
// Replace labels in commands with addresses
if(!lpErrorSpot)
lpErrorSpot = ReplaceLabelsInCommands(&label_head, &cmd_block_head, lpError);
// Patch!
if(!lpErrorSpot)
lpErrorSpot = PatchCommands(&cmd_block_head, lpError);
// Insert comments
if(!lpErrorSpot && options.asm_comments)
lpErrorSpot = SetComments(&cmd_block_head, lpError);
// Insert labels
if(!lpErrorSpot && options.asm_labels)
lpErrorSpot = SetLabels(&label_head, &cmd_block_head, lpError);
FreeLabelList(&label_head);
FreeCmdBlockList(&cmd_block_head);
InvalidateGui();
if(lpErrorSpot)
return -(lpErrorSpot-lpText);
else
return 1;
}
static TCHAR *TextToData(LABEL_HEAD *p_label_head, CMD_BLOCK_HEAD *p_cmd_block_head, TCHAR *lpText, TCHAR *lpError)
{
CMD_BLOCK_NODE *cmd_block_node;
TCHAR *p, *lpNextLine, *lpBlockDeclaration;
DWORD_PTR dwAddress, dwEndAddress;
DWORD_PTR dwBaseAddress;
TCHAR chCommentChar;
LONG_PTR result;
cmd_block_node = NULL;
dwAddress = 0;
dwEndAddress = 0;
dwBaseAddress = 0;
chCommentChar = _T('\0');
for(p = lpText; p != NULL; p = lpNextLine)
{
p = SkipSpaces(p);
lpNextLine = NullTerminateLine(p);
if(IsInComment(&chCommentChar, p, lpError))
continue;
while(*p != _T('\0') && *p != _T(';'))
{
if(!cmd_block_node && *p != _T('<'))
{
lstrcpy(lpError, _T("Address expected"));
return p;
}
switch(*p)
{
case _T('<'): // address
if(dwEndAddress != 0 && dwAddress > dwEndAddress)
{
wsprintf(lpError, _T("End of code block exceeds the block end address (%Iu extra bytes)"), dwAddress - dwEndAddress);
return lpBlockDeclaration;
}
lpBlockDeclaration = p;
result = AddressToData(p_cmd_block_head, &cmd_block_node, &dwAddress, &dwEndAddress, &dwBaseAddress, p, lpError);
break;
case _T('@'): // label
result = LabelToData(p_label_head, cmd_block_node, &dwAddress, p, lpError);
break;
case _T('!'): // special command
result = SpecialCommandToData(cmd_block_node, &dwAddress, dwEndAddress, p, lpError);
break;
default: // an asm command or a string
result = CommandToData(cmd_block_node, &dwAddress, dwBaseAddress, p, lpError);
break;
}
if(result <= 0)
return p + (-result);
p += result;
p = SkipSpaces(p);
}
}
if(dwEndAddress != 0 && dwAddress > dwEndAddress)
{
wsprintf(lpError, _T("End of code block exceeds the block end address (%Iu extra bytes)"), dwAddress - dwEndAddress);
return lpBlockDeclaration;
}
return NULL;
}
static LONG_PTR AddressToData(CMD_BLOCK_HEAD *p_cmd_block_head, CMD_BLOCK_NODE **p_cmd_block_node,
DWORD_PTR *pdwAddress, DWORD_PTR *pdwEndAddress, DWORD_PTR *pdwBaseAddress, TCHAR *lpText, TCHAR *lpError)
{
DWORD_PTR dwAddress;
LONG_PTR result = ParseAddress(lpText, &dwAddress, pdwEndAddress, pdwBaseAddress, lpError);
if(result <= 0)
return result;
if(!NewCmdBlock(p_cmd_block_head, dwAddress, lpError))
return 0;
*p_cmd_block_node = p_cmd_block_head->last;
*pdwAddress = dwAddress;
return result;
}
static LONG_PTR LabelToData(LABEL_HEAD *p_label_head, CMD_BLOCK_NODE *cmd_block_node, DWORD_PTR *pdwAddress, TCHAR *lpText, TCHAR *lpError)
{
DWORD_PTR dwAddress = *pdwAddress;
if(lpText[0] == _T('@') && lpText[1] == _T('@'))
return ParseAnonLabel(lpText, dwAddress, &cmd_block_node->anon_label_head, lpError);
DWORD_PTR dwPaddingSize = 0;
LONG_PTR result = ParseLabel(lpText, dwAddress, p_label_head, &dwPaddingSize, lpError);
if(result <= 0)
return result;
if(dwPaddingSize > 0)
{
if(!InsertBytes(lpText, dwPaddingSize, 0, &cmd_block_node->cmd_head, lpError))
return 0;
cmd_block_node->nSize += dwPaddingSize;
dwAddress += dwPaddingSize;
*pdwAddress = dwAddress;
}
return result;
}
static LONG_PTR SpecialCommandToData(CMD_BLOCK_NODE *cmd_block_node, DWORD_PTR *pdwAddress, DWORD_PTR dwEndAddress, TCHAR *lpText, TCHAR *lpError)
{
UINT nSpecialCmd;
LONG_PTR result = ParseSpecialCommand(lpText, &nSpecialCmd, lpError);
if(result <= 0)
return result;
DWORD_PTR dwAddress = *pdwAddress;
DWORD_PTR dwPaddingSize;
BYTE bPaddingByteValue;
switch(nSpecialCmd)
{
case SPECIAL_CMD_ALIGN:
result = ParseAlignSpecialCommand(lpText, result, dwAddress, &dwPaddingSize, lpError);
if(result <= 0)
return result;
if(dwPaddingSize > 0)
{
if(!InsertBytes(lpText, dwPaddingSize, 0, &cmd_block_node->cmd_head, lpError))
return 0;
cmd_block_node->nSize += dwPaddingSize;
dwAddress += dwPaddingSize;
*pdwAddress = dwAddress;
}
break;
case SPECIAL_CMD_PAD:
result = ParsePadSpecialCommand(lpText, result, &bPaddingByteValue, lpError);
if(result <= 0)
return result;
if(dwEndAddress == 0)
{
lstrcpy(lpError, _T("The !pad special command can only be used with a defined block end address"));
return 0;
}
if(dwEndAddress > dwAddress)
{
dwPaddingSize = dwEndAddress - dwAddress;
if(!InsertBytes(lpText, dwPaddingSize, bPaddingByteValue, &cmd_block_node->cmd_head, lpError))
return 0;
cmd_block_node->nSize += dwPaddingSize;
dwAddress += dwPaddingSize;
*pdwAddress = dwAddress;
}
break;
}
return result;
}
static LONG_PTR CommandToData(CMD_BLOCK_NODE *cmd_block_node, DWORD_PTR *pdwAddress, DWORD_PTR dwBaseAddress, TCHAR *lpText, TCHAR *lpError)
{
DWORD_PTR dwAddress = *pdwAddress;
SIZE_T nSize;
LONG_PTR result;
if(lpText[0] == _T('\"'))
result = ParseAsciiString(lpText, &cmd_block_node->cmd_head, &nSize, lpError);
else if(lpText[0] == _T('L') && lpText[1] == _T('\"'))
result = ParseUnicodeString(lpText, &cmd_block_node->cmd_head, &nSize, lpError);
else
result = ParseCommand(lpText, dwAddress, dwBaseAddress, &cmd_block_node->cmd_head, &nSize, lpError);
if(result <= 0)
return result;
cmd_block_node->nSize += nSize;
dwAddress += nSize;
*pdwAddress = dwAddress;
return result;
}
static BOOL IsInComment(TCHAR *pchCommentChar, TCHAR *lpText, TCHAR *lpError)
{
TCHAR chCommentChar = *pchCommentChar;
TCHAR *p = lpText;
if(chCommentChar != _T('\0'))
{
while(*p != _T('\0'))
{
if(*p == chCommentChar)
{
*pchCommentChar = _T('\0');
break;
}
p++;
}
return TRUE;
}
TCHAR *pszComment = _T("COMMENT");
while(*pszComment != _T('\0'))
{
TCHAR c = *p;
if(c >= _T('a') && c <= _T('z'))
c += -_T('a') + _T('A');
if(c != *pszComment)
return FALSE;
p++;
pszComment++;
}
TCHAR *p2 = SkipSpaces(p);
if(p2 == p || *p2 == _T('\0'))
return FALSE;
chCommentChar = *p2;
p = p2 + 1;
// A second occurrence of the char on the line
// terminates the comment
while(*p != _T('\0'))
{
if(*p == chCommentChar)
{
chCommentChar = _T('\0');
break;
}
p++;
}
*pchCommentChar = chCommentChar;
return TRUE;
}
static LONG_PTR ParseAddress(TCHAR *lpText, DWORD_PTR *pdwAddress, DWORD_PTR *pdwEndAddress, DWORD_PTR *pdwBaseAddress, TCHAR *lpError)
{
TCHAR *p;
DWORD_PTR dwAddress, dwBaseAddress;
DWORD_PTR dwEndAddress, dwEndBaseAddress;
LONG_PTR result;
p = lpText;
if(*p != _T('<'))
{
lstrcpy(lpError, _T("Could not parse address, '<' expected"));
return -(p-lpText);
}
p++;
p = SkipSpaces(p);
// Start address
if(*p == _T('$'))
{
result = ParseRVAAddress(p, &dwAddress, *pdwBaseAddress, &dwBaseAddress, lpError);
}
else
{
dwBaseAddress = 0;
result = ParseDWORDPtr(p, &dwAddress, lpError);
}
if(result <= 0)
return -(p-lpText)+result;
p += result;
p = SkipSpaces(p);
if(p[0] == _T('.') && p[1] == _T('.'))
{
p += 2;
p = SkipSpaces(p);
// End address
if(*p == _T('$'))
{
result = ParseRVAAddress(p, &dwEndAddress, *pdwBaseAddress, &dwEndBaseAddress, lpError);
}
else
{
dwEndBaseAddress = 0;
result = ParseDWORDPtr(p, &dwEndAddress, lpError);
}
if(result <= 0)
return -(p-lpText)+result;
if(dwBaseAddress != dwEndBaseAddress)
{
lstrcpy(lpError, _T("The RVA base address of both the start address and the end address must match"));
return -(p-lpText);
}
if(dwEndAddress <= dwAddress)
{
lstrcpy(lpError, _T("The end address must be greater than the start address"));
return -(p-lpText);
}
p += result;
p = SkipSpaces(p);
}
else
dwEndAddress = 0;
if(*p != _T('>'))
{
lstrcpy(lpError, _T("Could not parse address, '>' expected"));
return -(p-lpText);
}
p++;
*pdwAddress = dwAddress;
*pdwEndAddress = dwEndAddress;
*pdwBaseAddress = dwBaseAddress;
return p-lpText;
}
static BOOL NewCmdBlock(CMD_BLOCK_HEAD *p_cmd_block_head, DWORD_PTR dwAddress, TCHAR *lpError)
{
CMD_BLOCK_NODE *cmd_block_node;
cmd_block_node = (CMD_BLOCK_NODE *)HeapAlloc(GetProcessHeap(), 0, sizeof(CMD_BLOCK_NODE));
if(!cmd_block_node)
{
lstrcpy(lpError, _T("Allocation failed"));
return FALSE;
}
cmd_block_node->dwAddress = dwAddress;
cmd_block_node->nSize = 0;
cmd_block_node->cmd_head.next = NULL;
cmd_block_node->cmd_head.last = (CMD_NODE *)&cmd_block_node->cmd_head;
cmd_block_node->anon_label_head.next = NULL;
cmd_block_node->anon_label_head.last = (ANON_LABEL_NODE *)&cmd_block_node->anon_label_head;
cmd_block_node->next = NULL;
p_cmd_block_head->last->next = cmd_block_node;
p_cmd_block_head->last = cmd_block_node;
return TRUE;
}
static LONG_PTR ParseAnonLabel(TCHAR *lpText, DWORD_PTR dwAddress, ANON_LABEL_HEAD *p_anon_label_head, TCHAR *lpError)
{
ANON_LABEL_NODE *anon_label_node;
TCHAR *p;
p = lpText;
if(*p != _T('@') || p[1] != _T('@'))
{
lstrcpy(lpError, _T("Could not parse anonymous label, '@@' expected"));
return -(p-lpText);
}
p += 2;
p = SkipSpaces(p);
if(*p != _T(':'))
{
lstrcpy(lpError, _T("Could not parse anonymous label, ':' expected"));
return -(p-lpText);
}
p++;
anon_label_node = (ANON_LABEL_NODE *)HeapAlloc(GetProcessHeap(), 0, sizeof(ANON_LABEL_NODE));
if(!anon_label_node)
{
lstrcpy(lpError, _T("Allocation failed"));
return 0;
}
anon_label_node->dwAddress = dwAddress;
anon_label_node->next = NULL;
p_anon_label_head->last->next = anon_label_node;
p_anon_label_head->last = anon_label_node;
return p-lpText;
}
static LONG_PTR ParseLabel(TCHAR *lpText, DWORD_PTR dwAddress, LABEL_HEAD *p_label_head, DWORD_PTR *pdwPaddingSize, TCHAR *lpError)
{
LABEL_NODE *label_node;
TCHAR *p;
TCHAR *lpLabel, *lpLabelEnd;
DWORD_PTR dwAlignValue;
DWORD_PTR dwPaddingSize;
LONG_PTR result;
p = lpText;
if(*p != _T('@'))
{
lstrcpy(lpError, _T("Could not parse label, '@' expected"));
return -(p-lpText);
}
p++;
lpLabel = p;
if(
(*p < _T('0') || *p > _T('9')) &&
(*p < _T('A') || *p > _T('Z')) &&
(*p < _T('a') || *p > _T('z')) &&
*p != _T('_')
)
{
lstrcpy(lpError, _T("Could not parse label"));
return -(p-lpText);
}
p++;
while(
(*p >= _T('0') && *p <= _T('9')) ||
(*p >= _T('A') && *p <= _T('Z')) ||
(*p >= _T('a') && *p <= _T('z')) ||
*p == _T('_')
)
p++;
lpLabelEnd = p;
if(*p == _T('@'))
{
p++;
result = ParseDWORDPtr(p, &dwAlignValue, lpError);
if(result <= 0)
return -(p-lpText)+result;
if(!GetAlignPaddingSize(dwAddress, dwAlignValue, &dwPaddingSize, lpError))
return -(p-lpText);
p += result;
}
else
{
dwAlignValue = 0;
dwPaddingSize = 0;
}
p = SkipSpaces(p);
if(*p != _T(':'))
{
lstrcpy(lpError, _T("Could not parse label, ':' expected"));
return -(p-lpText);
}
p++;
*lpLabelEnd = _T('\0');
for(label_node = p_label_head->next; label_node != NULL; label_node = label_node->next)
{
if(lstrcmp(lpLabel, label_node->lpLabel) == 0)
{
lstrcpy(lpError, _T("Label redefinition"));
return 0;
}
}
label_node = (LABEL_NODE *)HeapAlloc(GetProcessHeap(), 0, sizeof(LABEL_NODE));
if(!label_node)
{
lstrcpy(lpError, _T("Allocation failed"));
return 0;
}
label_node->dwAddress = dwAddress + dwPaddingSize;
label_node->lpLabel = lpLabel;
label_node->next = NULL;
p_label_head->last->next = label_node;
p_label_head->last = label_node;
*pdwPaddingSize = dwPaddingSize;
return p-lpText;
}
static LONG_PTR ParseAsciiString(TCHAR *lpText, CMD_HEAD *p_cmd_head, SIZE_T *pnSizeInBytes, TCHAR *lpError)
{
#ifdef UNICODE
CMD_NODE *cmd_node;
WCHAR *p, *p2;
WCHAR *psubstr;
SIZE_T nStringLength;
WCHAR *lpComment;
char *dest;
SIZE_T nDestLen;
BYTE bHexVal;
int nBytesWritten;
int i;
// Check string, calc size
p = lpText;
if(*p != L'\"')
{
lstrcpy(lpError, L"Could not parse string, '\"' expected");
return -(p-lpText);
}
p++;
psubstr = p;
nStringLength = 0;
while(*p != L'\"' && *p != L'\0')
{
if(*p == L'\\')
{
if(p-psubstr > 0)
{
nStringLength += WideCharToMultiByte(CP_ACP, 0, psubstr, p-psubstr, NULL, 0, NULL, NULL);
psubstr = p;
}
p++;
switch(*p)
{
case L'x':
p++;
if((*p < L'0' || *p > L'9') && (*p < L'A' || *p > L'F') && (*p < L'a' || *p > L'f'))
{
lstrcpy(lpError, L"Could not parse string, hex constants must have at least one hex digit");
return -(psubstr-lpText);
}
while(*p == L'0')
p++;
for(i=0; (p[i] >= L'0' && p[i] <= L'9') || (p[i] >= L'A' && p[i] <= L'F') || (p[i] >= L'a' && p[i] <= L'f'); i++)
{
if(i >= 2)
{
lstrcpy(lpError, L"Could not parse string, value is too big for a character");
return -(psubstr-lpText);
}
}
p += i;
break;
case L'\\':
case L'\"':
case L'0':
case L'a':
case L'b':
case L'f':
case L'r':
case L'n':
case L't':
case L'v':
p++;
break;
default:
lstrcpy(lpError, L"Could not parse string, unrecognized character escape sequence");
return -(psubstr-lpText);
}
nStringLength++;
psubstr = p;
}
else
p++;
}
if(p-psubstr > 0)
nStringLength += WideCharToMultiByte(CP_ACP, 0, psubstr, p-psubstr, NULL, 0, NULL, NULL);
if(*p != L'\"')
{
lstrcpy(lpError, L"Could not parse string, '\"' expected");
return -(p-lpText);
}
if(nStringLength == 0)
{
lstrcpy(lpError, L"Empty strings are not allowed");
return -(p-lpText);
}
p++;
p = SkipSpaces(p);
if(*p != L'\0' && *p != L';')
{
lstrcpy(lpError, L"Unexpected input after string definition");
return -(p-lpText);
}
// Check for comment
if(p[0] == L';' && p[1] != L';')
{
lpComment = SkipSpaces(p+1);
if(*lpComment == L'\0')
lpComment = NULL;
}
else
lpComment = NULL;
// Allocate
cmd_node = (CMD_NODE *)HeapAlloc(GetProcessHeap(), 0, sizeof(CMD_NODE));
if(!cmd_node)
{
lstrcpy(lpError, L"Allocation failed");
return 0;
}
cmd_node->bCode = (BYTE *)HeapAlloc(GetProcessHeap(), 0, nStringLength);
if(!cmd_node->bCode)
{
HeapFree(GetProcessHeap(), 0, cmd_node);
lstrcpy(lpError, L"Allocation failed");
return 0;
}
// Parse string
p2 = lpText+1; // skip "
psubstr = p2;
dest = (char *)cmd_node->bCode;
nDestLen = nStringLength;
while(*p2 != L'\"')
{
if(*p2 == L'\\')
{
if(p2-psubstr > 0)
{
nBytesWritten = WideCharToMultiByte(CP_ACP, 0, psubstr, p2-psubstr, dest, nDestLen, NULL, NULL);
dest += nBytesWritten;
nDestLen -= nBytesWritten;
psubstr = p2;
}
p2++;
switch(*p2)
{
case L'x':
p2++;
bHexVal = 0;
while((*p2 >= L'0' && *p2 <= L'9') || (*p2 >= L'A' && *p2 <= L'F') || (*p2 >= L'a' && *p2 <= L'f'))
{
bHexVal <<= 4;
if(*p2 >= L'0' && *p2 <= L'9')
bHexVal |= *p2-L'0';
else if(*p2 >= L'A' && *p2 <= L'F')
bHexVal |= *p2-L'A'+10;
else if(*p2 >= L'a' && *p2 <= L'f')
bHexVal |= *p2-L'a'+10;
p2++;
}
*dest = bHexVal;
break;
case L'\\':
case L'\"':
*dest = (char)*p2;
p2++;
break;
case L'0':
*dest = L'\0';
p2++;
break;
case L'a':
*dest = L'\a';
p2++;
break;
case L'b':
*dest = L'\b';
p2++;
break;
case L'f':
*dest = L'\f';
p2++;
break;
case L'r':
*dest = L'\r';
p2++;
break;
case L'n':
*dest = L'\n';
p2++;
break;
case L't':
*dest = L'\t';
p2++;
break;
case L'v':
*dest = L'\v';
p2++;
break;
}
dest++;
psubstr = p2;
}
else
p2++;
}
if(p2-psubstr > 0)
WideCharToMultiByte(CP_ACP, 0, psubstr, p2-psubstr, dest, nDestLen, NULL, NULL);
#else // if !UNICODE
CMD_NODE *cmd_node;
char *p, *p2;
char *pescape;
SIZE_T nStringLength;
char *lpComment;
char *dest;
BYTE bHexVal;
int i;
// Check string, calc size
p = lpText;
if(*p != '\"')
{
lstrcpy(lpError, "Could not parse string, '\"' expected");
return -(p-lpText);
}
p++;
nStringLength = 0;
while(*p != '\"' && *p != '\0')
{
if(*p == '\\')
{
pescape = p;
p++;
switch(*p)
{
case 'x':
p++;
if((*p < '0' || *p > '9') && (*p < 'A' || *p > 'F') && (*p < 'a' || *p > 'f'))
{
lstrcpy(lpError, "Could not parse string, hex constants must have at least one hex digit");
return -(pescape-lpText);
}
while(*p == '0')
p++;
for(i=0; (p[i] >= '0' && p[i] <= '9') || (p[i] >= 'A' && p[i] <= 'F') || (p[i] >= 'a' && p[i] <= 'f'); i++)
{
if(i >= 2)
{
lstrcpy(lpError, "Could not parse string, value is too big for a character");
return -(pescape-lpText);
}
}
p += i;
break;
case '\\':
case '\"':
case '0':
case 'a':
case 'b':
case 'f':
case 'r':
case 'n':
case 't':
case 'v':
p++;
break;
default:
lstrcpy(lpError, "Could not parse string, unrecognized character escape sequence");
return -(pescape-lpText);
}
}
else
p++;
nStringLength++;
}
if(*p != '\"')
{
lstrcpy(lpError, "Could not parse string, '\"' expected");
return -(p-lpText);
}
if(nStringLength == 0)
{
lstrcpy(lpError, "Empty strings are not allowed");
return -(p-lpText);
}
p++;
p = SkipSpaces(p);
if(*p != '\0' && *p != ';')
{
lstrcpy(lpError, "Unexpected input after string definition");
return -(p-lpText);
}
// Check for comment
if(p[0] == ';' && p[1] != ';')
{
lpComment = SkipSpaces(p+1);
if(*lpComment == '\0')
lpComment = NULL;
}
else
lpComment = NULL;
// Allocate
cmd_node = (CMD_NODE *)HeapAlloc(GetProcessHeap(), 0, sizeof(CMD_NODE));
if(!cmd_node)
{
lstrcpy(lpError, "Allocation failed");
return 0;
}
cmd_node->bCode = (BYTE *)HeapAlloc(GetProcessHeap(), 0, nStringLength);
if(!cmd_node->bCode)
{
HeapFree(GetProcessHeap(), 0, cmd_node);
lstrcpy(lpError, "Allocation failed");
return 0;
}
// Parse string
p2 = lpText+1; // skip "
dest = (char *)cmd_node->bCode;
while(*p2 != '\"')
{
if(*p2 == '\\')
{
p2++;
switch(*p2)
{
case 'x':
p2++;
bHexVal = 0;
while((*p2 >= '0' && *p2 <= '9') || (*p2 >= 'A' && *p2 <= 'F') || (*p2 >= 'a' && *p2 <= 'f'))
{
bHexVal <<= 4;
if(*p2 >= '0' && *p2 <= '9')
bHexVal |= *p2-'0';
else if(*p2 >= 'A' && *p2 <= 'F')
bHexVal |= *p2-'A'+10;
else if(*p2 >= 'a' && *p2 <= 'f')
bHexVal |= *p2-'a'+10;
p2++;
}
*dest = (char)bHexVal;
break;
case '\\':
case '\"':
*dest = *p2;
p2++;
break;
case '0':
*dest = '\0';
p2++;
break;
case 'a':
*dest = '\a';
p2++;
break;
case 'b':
*dest = '\b';
p2++;
break;
case 'f':
*dest = '\f';
p2++;
break;
case 'r':
*dest = '\r';