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dict mkindex: code cleanup
handle malloc failure
check if open failed _before_ seeking
better arg handling

--- a/sys/src/cmd/dict/mkindex.c

+++ b/sys/src/cmd/dict/mkindex.c

@@ -23,6 +23,13 @@

 Entry	getentry(long);

 void

+usage(void)

+{

+	fprint(2, "usage: %s [-D] [-d dictname]\n", argv0);

+	exits("usage");

+}

+

+void

 main(int argc, char **argv)

 {

 	int i;

@@ -34,16 +41,16 @@

 	dict = &dicts[0];

 	ARGBEGIN {

 		case 'd':

-			p = ARGF();

+			p = EARGF(usage());

 			dict = 0;

-			if(p) {

-				for(i=0; dicts[i].name; i++)

-					if(strcmp(p, dicts[i].name)==0) {

-						dict = &dicts[i];

-						break;

-					}

+

+			for(i=0; dicts[i].name; i++) {

+				if(strcmp(p, dicts[i].name)==0) {

+					dict = &dicts[i];

+					break;

+				}

 			}

-			if(!dict) {

+			if(dict == nil) {

 				err("unknown dictionary: %s", p);

 				exits("nodict");

 			}

@@ -51,14 +58,16 @@

 		case 'D':

 			debug++;

 			break;

-	ARGEND }

+		default:

+			usage();

+	}ARGEND

 	USED(argc,argv);

 	bdict = Bopen(dict->path, OREAD);

-	ae = Bseek(bdict, 0, 2);

 	if(!bdict) {

 		err("can't open dictionary %s", dict->path);

 		exits("nodict");

 	}

+	ae = Bseek(bdict, 0, 2);

 	for(a = 0; a < ae; a = (*dict->nextoff)(a+1)) {

 		linelen = 0;

 		e = getentry(a);

@@ -91,11 +100,8 @@

 	n = e-b;

 	if(n) {

 		if(n > anslen) {

-			ans.start = realloc(ans.start, n);

-			if(!ans.start) {

-				err("out of memory");

-				exits("nomem");

-			}

+			if((ans.start = realloc(ans.start, n)) == nil)

+				sysfatal("realloc: %r");

 			anslen = n;

 		}

 		Bseek(bdict, b, 0);

--- a/sys/src/cmd/dict/roget.c

+++ b/sys/src/cmd/dict/roget.c

@@ -62,7 +62,7 @@

 			p += 4;

 			spc = 0;

 		}

-			

+

 		if (p < e.end -2 && strncmp(p, "[ ", 2) == 0){		/* twiddle layout */

 			outchars(" [");

 			continue;

-- 

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