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#include <u.h>
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#include <libc.h>
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int	(*doquote)(int);
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extern int _needsquotes(char*, int*);
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extern int _runeneedsquotes(Rune*, int*);
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char*
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unquotestrdup(char *s)
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{
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	char *t, *ret;
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	int quoting;
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	ret = s = strdup(s);	/* return unquoted copy */
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	if(ret == nil)
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		return ret;
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	quoting = 0;
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	t = s;	/* s is output string, t is input string */
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	while(*t!='\0' && (quoting || (*t!=' ' && *t!='\t'))){
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		if(*t != '\''){
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			*s++ = *t++;
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			continue;
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		}
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		/* *t is a quote */
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		if(!quoting){
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			quoting = 1;
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			t++;
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			continue;
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		}
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		/* quoting and we're on a quote */
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		if(t[1] != '\''){
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			/* end of quoted section; absorb closing quote */
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			t++;
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			quoting = 0;
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			continue;
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		}
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		/* doubled quote; fold one quote into two */
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		t++;
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		*s++ = *t++;
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	}
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	if(t != s)
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		memmove(s, t, strlen(t)+1);
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	return ret;
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}
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Rune*
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unquoterunestrdup(Rune *s)
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{
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	Rune *t, *ret;
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	int quoting;
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	ret = s = runestrdup(s);	/* return unquoted copy */
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	if(ret == nil)
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		return ret;
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	quoting = 0;
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	t = s;	/* s is output string, t is input string */
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	while(*t!='\0' && (quoting || (*t!=' ' && *t!='\t'))){
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		if(*t != '\''){
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			*s++ = *t++;
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			continue;
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		}
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		/* *t is a quote */
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		if(!quoting){
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			quoting = 1;
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			t++;
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			continue;
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		}
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		/* quoting and we're on a quote */
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		if(t[1] != '\''){
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			/* end of quoted section; absorb closing quote */
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			t++;
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			quoting = 0;
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			continue;
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		}
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		/* doubled quote; fold one quote into two */
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		t++;
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		*s++ = *t++;
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	}
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	if(t != s)
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		memmove(s, t, (runestrlen(t)+1)*sizeof(Rune));
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	return ret;
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}
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char*
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quotestrdup(char *s)
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{
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	char *t, *u, *ret;
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	int quotelen;
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	Rune r;
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	if(_needsquotes(s, &quotelen) == 0)
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		return strdup(s);
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	ret = malloc(quotelen+1);
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	if(ret == nil)
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		return nil;
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	u = ret;
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	*u++ = '\'';
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	for(t=s; *t; t++){
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		r = *t;
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		if(r == L'\'')
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			*u++ = r;	/* double the quote */
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		*u++ = r;
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	}
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	*u++ = '\'';
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	*u = '\0';
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	return ret;
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}
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Rune*
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quoterunestrdup(Rune *s)
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{
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	Rune *t, *u, *ret;
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	int quotelen;
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	Rune r;
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	if(_runeneedsquotes(s, &quotelen) == 0)
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		return runestrdup(s);
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	ret = malloc((quotelen+1)*sizeof(Rune));
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	if(ret == nil)
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		return nil;
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	u = ret;
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	*u++ = '\'';
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	for(t=s; *t; t++){
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		r = *t;
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		if(r == L'\'')
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			*u++ = r;	/* double the quote */
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		*u++ = r;
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	}
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	*u++ = '\'';
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	*u = '\0';
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	return ret;
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}