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abaco: allow single quotes for ctype attribute (thanks plhk)

plhk9 → abaco: charset 'utf-8'> not supported
plhk9 → http://plhk.ru/trash/abaco-singlequote.diff makes it go away

--- a/sys/src/cmd/abaco/util.c

+++ b/sys/src/cmd/abaco/util.c

@@ -866,7 +866,7 @@

 int

 findctype(char *b, int l, char *keyword, char *s)

 {

-	char *p, *e;

+	char *p, *e, c;

 	int i;

 	p = cistrstr(s, keyword);

@@ -882,14 +882,18 @@

 		p++;

 	if(!*p)

 		return -1;

-	if(*p == '"'){

+	switch (c = *p){

+	case '"':

+	case '\'':

 		p++;

-		e = strchr(p, '"');

+		e = strchr(p, c);

 		if(!e)

 			return -1;

-	}else

+		break;

+	default:

 		for(e = p; *e < 127 && *e > ' ' ; e++)

 			;

+	}

 	i = e-p;

 	if(i < 1)

 		return -1;

-- 

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