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bitsy: replace atoi() calls with strtol() when hex can be expcted

--- a/sys/src/9/bitsy/devuda1341.c

+++ b/sys/src/9/bitsy/devuda1341.c

@@ -1326,7 +1326,8 @@

 			if(strcmp(cb->f[i], "reg") == 0) {

 				if(cb->nf < 3)

 					error(Evolume);

-				setreg(cb->f[1], atoi(cb->f[2]), cb->nf == 4 ? atoi(cb->f[3]):1);

+				setreg(cb->f[1], strtol(cb->f[2], 0, 0),

+					cb->nf == 4 ? strtol(cb->f[3], 0, 0):1);

 				return n0;

 			}

 			error(Evolume);

--- a/sys/src/9/bitsy/devµc.c

+++ b/sys/src/9/bitsy/devµc.c

@@ -349,7 +349,7 @@

 	if(cmd->nf > 15)

 		error(Ebadarg);

 	for(i = 0; i < cmd->nf; i++)

-		data[i] = atoi(cmd->f[i]);

+		data[i] = strtol(cmd->f[i], 0, 0);

 	switch((ulong)c->qid.path){

 	case Qled:

--- a/sys/src/9/bitsy/screen.c

+++ b/sys/src/9/bitsy/screen.c

@@ -194,14 +194,14 @@

 		return;

 	if(*cmd->f[0] == 'h')

 		lcd->lccr1 = ((Ht-16)<<PPL)

-			| (atoi(cmd->f[1])<<HSW)

-			| (atoi(cmd->f[2])<<ELW)

-			| (atoi(cmd->f[3])<<BLW);

+			| (strtol(cmd->f[1], 0, 0)<<HSW)

+			| (strtol(cmd->f[2], 0, 0)<<ELW)

+			| (strtol(cmd->f[3], 0, 0)<<BLW);

 	if(*cmd->f[0] == 'v')

 		lcd->lccr2 = ((Wid-1)<<LPP)

-			| (atoi(cmd->f[1])<<VSW)

-			| (atoi(cmd->f[2])<<EFW)

-			| (atoi(cmd->f[3])<<BFW);

+			| (strtol(cmd->f[1], 0, 0)<<VSW)

+			| (strtol(cmd->f[2], 0, 0)<<EFW)

+			| (strtol(cmd->f[3], 0, 0)<<BFW);

 }

 void