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bitsy/keyboard: do not rely on atoi() being able to parse hex

--- a/sys/src/cmd/bitsy/keyboard.c

+++ b/sys/src/cmd/bitsy/keyboard.c

@@ -363,7 +363,7 @@

 			if(n == 3)

 			if(strcmp(args[0], "keyboard:")==0 || strcmp(args[0], "scribble:")==0)

 			if(strcmp(args[1], "value") == 0){

-				n = atoi(args[2]);

+				n = strtol(args[2], 0, 0);

 				if(n <= Runemax){

 					r = n;

 					i = runetochar(str, &r);

--- a/sys/src/cmd/bitsy/prompter.c

+++ b/sys/src/cmd/bitsy/prompter.c

@@ -279,7 +279,7 @@

 		if(n == 3)

 		if(strcmp(args[0], "keyboard:")==0 || strcmp(args[0], "scribble:")==0)

 		if(strcmp(args[1], "value") == 0){

-			n = atoi(args[2]);

+			n = strtol(args[2], 0, 0);

 			if(n == '\033')	/* Escape exits */

 				break;

 			if(n <= Runemax){

-- 

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