Sweden-Number/tools/wrc/parser.l

/* -*-C-*-
 *
 * Copyright 1998-2000	Bertho A. Stultiens (BS)
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * History:
 * 21-May-2000 BS	- Fixed the ident requirement of resource names
 *			  which can be keywords.
 * 30-Apr-2000 BS	- Reintegration into the wine-tree
 * 11-Jan-2000 BS	- Very drastic cleanup because we don't have a
 *			  preprocessor in here anymore.
 * 02-Jan-2000 BS	- Removed the preprocessor code
 * 23-Dec-1999 BS	- Removed the copyright for Martin von Loewis.
 *			  There is really nothing left of his code in
 *			  this parser.
 * 20-Jun-1998 BS	- Changed the filename conversion. Filenames are
 *			  case-sensitive inder *nix, but not under dos.
 *			  default behaviour is to convert to lower case.
 *			- All backslashes are converted to forward and
 *			  both single and double slash is recognized as
 *			  MS/Borland does.
 *			- Fixed a bug in 'yywf' case that prevented
 *			  double quoted names to be scanned propperly.
 *
 * 19-May-1998 BS	- Started to build a preprocessor.
 *			- Changed keyword processing completely to
 *			  table-lookups.
 *
 * 20-Apr-1998 BS	- Added ';' comment stripping
 *
 * 17-Apr-1998 BS	- Made the win32 keywords optional when compiling in
 *			  16bit mode
 *
 * 15-Apr-1998 BS	- Changed string handling to include escapes
 *			- Added unicode string handling (no codepage
 *			  translation though).
 *			- 'Borrowed' the main idea of string scanning from
 *			  the flex manual pages.
 *			- Added conditional handling of scanning depending
 *			  on the state of the parser. This was mainly required
 *			  to distinguish a file to load or raw data that
 *			  follows. MS's definition of filenames is rather
 *			  complex... It can be unquoted or double quoted. If
 *			  double quoted, then the '\\' char is not automatically
 *			  escaped according to Borland's rc compiler, but it
 *			  accepts both "\\path\\file.rc" and "\path\file.rc".
 *			  This makes life very hard! I go for the escaped
 *			  version, as this seems to be the documented way...
 *			- Single quoted strings are now parsed and converted
 *			  here.
 *			- Added comment stripping. The implementation is
 *			  'borrowed' from the flex manpages.
 *			- Rebuild string processing so that it may contain
 *			  escaped '\0'.
 */

/* Exclusive string handling */
%x yystr
/* Exclusive unicode string handling */
%x yylstr
/* Exclusive rcdata single quoted data handling */
%x yyrcd
/* Exclusive comment eating... */
%x comment
/* Set when stripping c-junk */
%x pp_stripe
%x pp_strips
%x pp_stripp
%x pp_stripp_final
/* Set when scanning #line style directives */
%x pp_line

%option stack
%option never-interactive

/* Some shortcut definitions */
ws	[ \f\t\r]
cident	[a-zA-Z_][0-9a-zA-Z_]*

%{

/*#define LEX_DEBUG*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>

#include "wrc.h"
#include "utils.h"
#include "parser.h"
#include "newstruc.h"

#include "y.tab.h"

#define YY_USE_PROTOS
#define YY_NO_UNPUT
#define YY_NO_TOP_STATE

/* Always update the current character position within a line */
#define YY_USER_ACTION	char_number+=yyleng; wanted_id = want_id; want_id = 0;

static void addcchar(char c);
static void addwchar(short s);
static string_t *get_buffered_cstring(void);
static string_t *get_buffered_wstring(void);
static string_t *make_string(char *s);

static char *cbuffer;		/* Buffers for string collection */
static int cbufidx;
static int cbufalloc = 0;
static short *wbuffer;
static int wbufidx;
static int wbufalloc = 0;
static int stripslevel = 0;	/* Count {} during pp_strips/pp_stripe mode */
static int stripplevel = 0;	/* Count () during pp_strips mode */
static int cjunk_tagline;	/* Where did we start stripping (helps error tracking) */

/*
 * This one is a bit tricky.
 * We set 'want_id' in the parser to get the first
 * identifier we get across in the scanner, but we
 * also want it to be reset at nearly any token we
 * see. Exceptions are:
 * - newlines
 * - comments
 * - whitespace
 *
 * The scanner will automatically reset 'want_id'
 * after *each* scanner reduction and puts is value
 * into the var below. In this way we can see the
 * state after the YY_RULE_SETUP (i.e. the user action;
 * see above) and don't have to worry too much when
 * it needs to be reset.
 */
static int wanted_id = 0;
static int save_wanted_id;	/* To save across comment reductions */

struct keyword {
	char	*keyword;
	int	token;
	int	isextension;
	int	needcase;
	int	alwayskw;
};

static struct keyword keywords[] = {
	{ "ACCELERATORS",	tACCELERATORS,		0, 0, 0},
	{ "ALT",		tALT,			0, 0, 0},
	{ "ASCII",		tASCII,			0, 0, 0},
	{ "AUTO3STATE",		tAUTO3STATE,		1, 0, 0},
	{ "AUTOCHECKBOX",	tAUTOCHECKBOX,		1, 0, 0},
	{ "AUTORADIOBUTTON",	tAUTORADIOBUTTON,	1, 0, 0},
	{ "BEGIN",		tBEGIN,			0, 0, 0},
	{ "BITMAP",		tBITMAP,		0, 0, 0},
	{ "BLOCK",		tBLOCK,			0, 0, 0},
	{ "BUTTON",		tBUTTON,		1, 0, 0},
	{ "CAPTION",		tCAPTION,		0, 0, 0},
	{ "CHARACTERISTICS",	tCHARACTERISTICS,	1, 0, 0},
	{ "CHECKBOX",		tCHECKBOX,		0, 0, 0},
	{ "CHECKED",		tCHECKED,		0, 0, 0},
	{ "CLASS",		tCLASS,			0, 0, 0},
	{ "COMBOBOX",		tCOMBOBOX,		0, 0, 0},
	{ "CONTROL",		tCONTROL,		0, 0, 0},
	{ "CTEXT",		tCTEXT,			0, 0, 0},
	{ "CURSOR",		tCURSOR,		0, 0, 0},
	{ "DEFPUSHBUTTON",	tDEFPUSHBUTTON,		0, 0, 0},
	{ "DIALOG",		tDIALOG,		0, 0, 0},
	{ "DIALOGEX",		tDIALOGEX,		1, 0, 0},
	{ "DISCARDABLE",	tDISCARDABLE,		0, 0, 0},
	{ "DLGINIT",		tDLGINIT,		0, 0, 0},
	{ "EDITTEXT",		tEDITTEXT,		0, 0, 0},
	{ "END",		tEND,			0, 0, 0},
	{ "EXSTYLE",		tEXSTYLE,		0, 0, 0},
	{ "FILEFLAGS",		tFILEFLAGS,		0, 0, 0},
	{ "FILEFLAGSMASK",	tFILEFLAGSMASK,		0, 0, 0},
	{ "FILEOS",		tFILEOS,		0, 0, 0},
	{ "FILESUBTYPE",	tFILESUBTYPE,		0, 0, 0},
	{ "FILETYPE",		tFILETYPE,		0, 0, 0},
	{ "FILEVERSION",	tFILEVERSION,		0, 0, 0},
	{ "FIXED",		tFIXED,			0, 0, 0},
	{ "FONT",		tFONT,			0, 0, 0},
	{ "FONTDIR",		tFONTDIR,		0, 0, 0},	/* This is a Borland BRC extension */
	{ "GRAYED",		tGRAYED,		0, 0, 0},
	{ "GROUPBOX",		tGROUPBOX,		0, 0, 0},
	{ "HELP",		tHELP,			0, 0, 0},
	{ "ICON",		tICON,			0, 0, 0},
	{ "IMPURE",		tIMPURE,		0, 0, 0},
	{ "INACTIVE",		tINACTIVE,		0, 0, 0},
	{ "LANGUAGE",		tLANGUAGE,		1, 0, 1},
	{ "LISTBOX",		tLISTBOX,		0, 0, 0},
	{ "LOADONCALL",		tLOADONCALL,		0, 0, 0},
	{ "LTEXT",		tLTEXT,			0, 0, 0},
	{ "MENU",		tMENU,			0, 0, 0},
	{ "MENUBARBREAK",	tMENUBARBREAK,		0, 0, 0},
	{ "MENUBREAK",		tMENUBREAK,		0, 0, 0},
	{ "MENUEX",		tMENUEX,		1, 0, 0},
	{ "MENUITEM",		tMENUITEM,		0, 0, 0},
	{ "MESSAGETABLE",	tMESSAGETABLE,		1, 0, 0},
	{ "MOVEABLE",		tMOVEABLE,		0, 0, 0},
	{ "NOINVERT",		tNOINVERT,		0, 0, 0},
	{ "NOT",		tNOT,			0, 0, 0},
	{ "POPUP",		tPOPUP,			0, 0, 0},
	{ "PRELOAD",		tPRELOAD,		0, 0, 0},
	{ "PRODUCTVERSION",	tPRODUCTVERSION,	0, 0, 0},
	{ "PURE",		tPURE,			0, 0, 0},
	{ "PUSHBUTTON",		tPUSHBUTTON,		0, 0, 0},
	{ "RADIOBUTTON",	tRADIOBUTTON,		0, 0, 0},
	{ "RCDATA",		tRCDATA,		0, 0, 0},
	{ "RTEXT",		tRTEXT,			0, 0, 0},
	{ "SCROLLBAR",		tSCROLLBAR,		0, 0, 0},
	{ "SEPARATOR",		tSEPARATOR,		0, 0, 0},
	{ "SHIFT",		tSHIFT,			0, 0, 0},
	{ "STATE3",		tSTATE3,		1, 0, 0},
	{ "STRING",		tSTRING,		0, 0, 0},
	{ "STRINGTABLE",	tSTRINGTABLE,		0, 0, 1},
	{ "STYLE",		tSTYLE,			0, 0, 0},
	{ "TOOLBAR",		tTOOLBAR,		1, 0, 0},
	{ "VALUE",		tVALUE,			0, 0, 0},
	{ "VERSION",		tVERSION,		1, 0, 0},
	{ "VERSIONINFO",	tVERSIONINFO,		0, 0, 0},
	{ "VIRTKEY",		tVIRTKEY,		0, 0, 0}
};

#define NKEYWORDS	(sizeof(keywords)/sizeof(keywords[0]))
#define KWP(p)		((struct keyword *)(p))
static int kw_cmp_func(const void *s1, const void *s2)
{
	int ret;
	ret = strcasecmp(KWP(s1)->keyword, KWP(s2)->keyword);
	if(!ret && (KWP(s1)->needcase || KWP(s2)->needcase))
		return strcmp(KWP(s1)->keyword, KWP(s2)->keyword);
	else
		return ret;
}

#define KW_BSEARCH
#define DO_SORT
static struct keyword *iskeyword(char *kw)
{
	struct keyword *kwp;
	struct keyword key;
	key.keyword = kw;
	key.needcase = 0;
#ifdef DO_SORT
	{
		/* Make sure that it is sorted for bsearsh */
		static int sorted = 0;
		if(!sorted)
		{
			qsort(keywords, NKEYWORDS, sizeof(keywords[0]), kw_cmp_func);
			sorted = 1;
		}
	}
#endif
#ifdef KW_BSEARCH
	kwp = bsearch(&key, keywords, NKEYWORDS, sizeof(keywords[0]), kw_cmp_func);
#else
	{
		int i;
		for(i = 0; i < NKEYWORDS; i++)
		{
			if(!kw_cmp_func(&key, &keywords[i]))
				break;
		}
		if(i < NKEYWORDS)
			kwp = &keywords[i];
		else
			kwp = NULL;
	}
#endif

	if(kwp == NULL || (kwp->isextension && !extensions))
		return NULL;
	else
		return kwp;
}

%}

/*
 **************************************************************************
 * The flexer starts here
 **************************************************************************
 */
%%
	/*
	 * Catch the GCC-style line statements here and parse them.
	 * This has the advantage that you can #include at any
	 * stage in the resource file.
	 * The preprocessor generates line directives in the format:
	 * # <linenum> "filename" <codes>
	 *
	 * Codes can be a sequence of:
	 * - 1 start of new file
	 * - 2 returning to previous
	 * - 3 system header
	 * - 4 interpret as C-code
	 *
	 * 4 is not used and 1 mutually excludes 2
	 * Anyhow, we are not really interested in these at all
	 * because we only want to know the linenumber and
	 * filename.
	 */
<INITIAL,pp_strips,pp_stripp>^{ws}*\#{ws}*	yy_push_state(pp_line);
<pp_line>[^\n]*	{
		int lineno;
		char *cptr;
		char *fname;
		yy_pop_state();
		lineno = (int)strtol(yytext, &cptr, 10);
		if(!lineno)
			yyerror("Malformed '#...' line-directive; invalid linenumber");
		fname = strchr(cptr, '"');
		if(!fname)
			yyerror("Malformed '#...' line-directive; missing filename");
		fname++;
		cptr = strchr(fname, '"');
		if(!cptr)
			yyerror("Malformed '#...' line-directive; missing terminating \"");
		*cptr = '\0';
		line_number = lineno - 1;	/* We didn't read the newline */
		input_name = xstrdup(fname);
	}

	/*
	 * Strip everything until a ';' taking
	 * into account braces {} for structures,
	 * classes and enums.
	 */
<pp_strips>\{			stripslevel++;
<pp_strips>\}			stripslevel--;
<pp_strips>;			if(!stripslevel) yy_pop_state();
<pp_strips>\/[^*\n]		; /* To catch comments */
<pp_strips>[^\{\};\n#/]*	; /* Ignore rest */
<pp_strips>\n			line_number++; char_number = 1;

<pp_stripp>\(			stripplevel++;
<pp_stripp>\)			{
					stripplevel--;
					if(!stripplevel)
					{
						yy_pop_state();
						yy_push_state(pp_stripp_final);
					}
				}
<pp_stripp>\/[^*\n]		; /* To catch comments */
<pp_stripp>[^\(\);\n#/]*	; /* Ignore rest */
<pp_stripp>\n			line_number++; char_number = 1;

<pp_stripp_final>{ws}*		; /* Ignore */
<pp_stripp_final>;		yy_pop_state(); /* Kill the semicolon */
<pp_stripp_final>\n		line_number++; char_number = 1; yy_pop_state();
<pp_stripp_final>.		yyless(0); yy_pop_state();

\{			return tBEGIN;
\}			return tEND;

[0-9]+[lL]?		{ yylval.num = strtoul(yytext,  0, 10); return toupper(yytext[yyleng-1]) == 'L' ? tLNUMBER : tNUMBER; }
0[xX][0-9A-Fa-f]+[lL]?	{ yylval.num = strtoul(yytext,  0, 16); return toupper(yytext[yyleng-1]) == 'L' ? tLNUMBER : tNUMBER; }
0[oO][0-7]+[lL]?	{ yylval.num = strtoul(yytext+2, 0, 8); return toupper(yytext[yyleng-1]) == 'L' ? tLNUMBER : tNUMBER; }

	/*
	 * The next two rules scan identifiers and filenames.
	 * This is achieved by using the priority ruling
	 * of the scanner where a '.' is valid in a filename
	 * and *only* in a filename. In this case, the second
	 * rule will be reduced because it is longer.
	 */
[A-Za-z_0-9]+		{
				struct keyword *tok = iskeyword(yytext);

				if(tok)
				{
					if(wanted_id && !tok->alwayskw)
					{
						yylval.str = make_string(yytext);
						return tIDENT;
					}
					else
						return tok->token;
				}
				else
				{
					yylval.str = make_string(yytext);
					return tIDENT;
				}
			}
[A-Za-z_0-9./\\]+		yylval.str = make_string(yytext); return tFILENAME;

	/*
	 * Wide string scanning
	 */
L\"			{
				yy_push_state(yylstr);
				wbufidx = 0;
				if(!win32)
					yywarning("16bit resource contains unicode strings\n");
			}
<yylstr>\"{ws}+	|
<yylstr>\"		{
				yy_pop_state();
				yylval.str = get_buffered_wstring();
				return tSTRING;
			}
<yylstr>\\[0-7]{1,6}	{ /* octal escape sequence */
				int result;
				result = strtol(yytext+1, 0, 8);
				if ( result > 0xffff )
					yyerror("Character constant out of range");
				addwchar((short)result);
			}
<yylstr>\\x[0-9a-fA-F]{4} {  /* hex escape sequence */
				int result;
				result = strtol(yytext+2, 0, 16);
				addwchar((short)result);
			}
<yylstr>\\x[0-9a-fA-F]{1,3} {  yyerror("Invalid hex escape sequence '%s'", yytext); }

<yylstr>\\[0-9]+	yyerror("Bad escape sequence");
<yylstr>\\a		addwchar('\a');
<yylstr>\\b		addwchar('\b');
<yylstr>\\f		addwchar('\f');
<yylstr>\\n		addwchar('\n');
<yylstr>\\r		addwchar('\r');
<yylstr>\\t		addwchar('\t');
<yylstr>\\v		addwchar('\v');
<yylstr>\\(\n|.)	addwchar(yytext[1]);
<yylstr>\\\r\n		addwchar(yytext[2]);
<yylstr>\"\"		addcchar('\"');		/* "bla""bla"  -> "bla\"bla" */
<yylstr>\\\"\"		addcchar('\"');		/* "bla\""bla" -> "bla\"bla" */
<yylstr>\"{ws}+\"	;			/* "bla" "bla" -> "blabla" */
<yylstr>[^\\\n\"]+	{
				char *yptr = yytext;
				while(*yptr)	/* FIXME: codepage translation */
					addwchar(*yptr++ & 0xff);
			}
<yylstr>\n		yyerror("Unterminated string");

	/*
	 * Normal string scanning
	 */
\"			yy_push_state(yystr); cbufidx = 0;
<yystr>\"{ws}+	|
<yystr>\"		{
				yy_pop_state();
				yylval.str = get_buffered_cstring();
				return tSTRING;
			}
<yystr>\\[0-7]{1,3}	{ /* octal escape sequence */
				int result;
				result = strtol(yytext+1, 0, 8);
				if ( result > 0xff )
					yyerror("Character constant out of range");
				addcchar((char)result);
			}
<yystr>\\x[0-9a-fA-F]{2} {  /* hex escape sequence */
				int result;
				result = strtol(yytext+2, 0, 16);
				addcchar((char)result);
			}
<yystr>\\x[0-9a-fA-F]	{  yyerror("Invalid hex escape sequence '%s'", yytext); }

<yystr>\\[0-9]+		yyerror("Bad escape secuence");
<yystr>\\a		addcchar('\a');
<yystr>\\b		addcchar('\b');
<yystr>\\f		addcchar('\f');
<yystr>\\n		addcchar('\n');
<yystr>\\r		addcchar('\r');
<yystr>\\t		addcchar('\t');
<yystr>\\v		addcchar('\v');
<yystr>\\(\n|.)		addcchar(yytext[1]);
<yystr>\\\r\n		addcchar(yytext[2]);
<yystr>[^\\\n\"]+	{
				char *yptr = yytext;
				while(*yptr)
					addcchar(*yptr++);
			}
<yystr>\"\"		addcchar('\"');		/* "bla""bla"   -> "bla\"bla" */
<yystr>\\\"\"		addcchar('\"');		/* "bla\""bla"  -> "bla\"bla" */
<yystr>\"{ws}+\"	;			/* "bla" "bla"  -> "blabla" */
<yystr>\n		yyerror("Unterminated string");

	/*
	 * Raw data scanning
	 */
\'			yy_push_state(yyrcd); cbufidx = 0;
<yyrcd>\'		{
				yy_pop_state();
				yylval.raw = new_raw_data();
				yylval.raw->size = cbufidx;
				yylval.raw->data = xmalloc(yylval.raw->size);
				memcpy(yylval.raw->data, cbuffer, yylval.raw->size);
				return tRAWDATA;
			}
<yyrcd>[0-9a-fA-F]{2}	{
				int result;
				result = strtol(yytext, 0, 16);
				addcchar((char)result);
			}
<yyrcd>{ws}+		;	/* Ignore space */
<yyrcd>\n		line_number++; char_number = 1;
<yyrcd>.		yyerror("Malformed data-line");

	/*
	 * Comment stripping
	 * Should never occur after preprocessing
	 */
<INITIAL,pp_stripp,pp_strips>"/*"	{
				yy_push_state(comment);
				save_wanted_id = wanted_id;
				if(!no_preprocess)
					yywarning("Found comments after preprocessing, please report");
			}
<comment>[^*\n]*	;
<comment>"*"+[^*/\n]*	;
<comment>\n		line_number++; char_number = 1;
<comment>"*"+"/"	yy_pop_state(); want_id = save_wanted_id;

;[^\n]*			want_id = wanted_id; /* not really comment, but left-over c-junk */
"//"[^\n]*		want_id = wanted_id; if(!no_preprocess) yywarning("Found comments after preprocessing, please report");

\n			{
				want_id = wanted_id;
				line_number++;
				char_number = 1;
				if(want_nl)
				{
					want_nl = 0;
					return tNL;
				}
			}
{ws}+			want_id = wanted_id;	/* Eat whitespace */

<INITIAL>.		return yytext[0];

<<EOF>>			{
				if(YY_START == pp_strips || YY_START == pp_stripe || YY_START == pp_stripp || YY_START == pp_stripp_final)
					yyerror("Unexpected end of file during c-junk scanning (started at %d)", cjunk_tagline);
				else
					yyterminate();
			}

<*>.|\n			{
				/* Catch all rule to find any unmatched text */
				if(*yytext == '\n')
				{
					line_number++;
					char_number = 1;
				}
				yywarning("Unmatched text '%c' (0x%02x) YY_START=%d stripslevel=%d",
					isprint(*yytext & 0xff) ? *yytext : '.', *yytext, YY_START,stripslevel);
			}

%%

#ifndef yywrap
int yywrap(void)
{
#if 0
	if(bufferstackidx > 0)
	{
		return 0;
 	}
#endif
	return 1;
}
#endif

/* These dup functions copy the enclosed '\0' from
 * the resource string.
 */
static void addcchar(char c)
{
	if(cbufidx >= cbufalloc)
	{
		cbufalloc += 1024;
		cbuffer = xrealloc(cbuffer, cbufalloc * sizeof(cbuffer[0]));
		if(cbufalloc > 65536)
			yywarning("Reallocating string buffer larger than 64kB");
	}
	cbuffer[cbufidx++] = c;
}

static void addwchar(short s)
{
	if(wbufidx >= wbufalloc)
	{
		wbufalloc += 1024;
		wbuffer = xrealloc(wbuffer, wbufalloc * sizeof(wbuffer[0]));
		if(wbufalloc > 65536)
			yywarning("Reallocating wide string buffer larger than 64kB");
	}

	/*
	 * BS 08-Aug-1999 FIXME: The '& 0xff' is probably a bug, but I have
	 * not experienced it yet and I seem to remember that this was for
	 * a reason. But, as so many things you tend to forget why.
	 * I guess that there were problems due to the sign extension of
	 * shorts WRT chars (e.g. 0x80 becomes 0xff80 instead of 0x0080).
	 * This should then be fixed in the lexer calling the function.
	 */
	wbuffer[wbufidx++] = (short)(s & 0xff);
}

static string_t *get_buffered_cstring(void)
{
	string_t *str = new_string();
	str->size = cbufidx;
	str->type = str_char;
	str->str.cstr = (char *)xmalloc(cbufidx+1);
	memcpy(str->str.cstr, cbuffer, cbufidx);
	str->str.cstr[cbufidx] = '\0';
	return str;
}

static string_t *get_buffered_wstring(void)
{
	string_t *str = new_string();
	str->size = wbufidx;
	str->type = str_unicode;
	str->str.wstr = (short *)xmalloc(2*(wbufidx+1));
	memcpy(str->str.wstr, wbuffer, wbufidx);
	str->str.wstr[wbufidx] = 0;
	return str;
}

static string_t *make_string(char *s)
{
	string_t *str = new_string();
	str->size = strlen(s);
	str->type = str_char;
	str->str.cstr = (char *)xmalloc(str->size+1);
	memcpy(str->str.cstr, s, str->size+1);
	return str;
}