Initial revision

include/occam/dec.ocm

@@ -0,0 +1,62 @@
+-- decin/decout - Decimal i/o
+
+proc decin(chan in, var d, c)=
+-- Reads a decimal number from input into d.  c is used as the first input
+-- character, and it contains the character just after the decimal number
+-- when decin exits.
+
+	var neg:
+	seq
+		while (c='*s') or (c='*t') or (c='*n')
+			in ? c
+		if
+			(c='-') or (c='+')
+				seq
+					neg:=(c='-')
+					in ? c
+			true
+				neg:=false
+		d:=0
+		while ('0'<=c) and (c<='9')
+			seq
+				d:=(d*10)+(c-'0')
+				in ? c
+		if
+			neg
+				d:= -d
+:
+proc decout(chan out, value d, w)=
+-- Sends d to channel out in decimal on a field of w spaces.  It is just like
+-- fprintf(out, "%*d", w, d);
+
+	var dec[BYTE 12], di, dd, d0, neg:
+	seq
+		di:=0
+		if
+			d<0
+				seq
+					neg:=true
+					dd:= -d
+			d>=0
+				seq
+					neg:=false
+					dd:=d
+		d0:=1
+		while d0<>0
+			seq
+				dec[BYTE di]:=(dd\10)+'0'
+				di:=di+1
+				dd:=dd/10
+				d0:=dd
+		if
+			neg
+				seq
+					dec[BYTE di]:='-'
+					di:=di+1
+		seq i=[0 for w-di]
+			out ! '*s'
+		while di<>0
+			seq
+				di:=di-1
+				out ! dec[BYTE di]		
+: