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CPM OPERATING SYSTEMS/CPM 68K/1.0X SOURCES/v101/vms/getchar.c

@@ -0,0 +1,31 @@
+#define BLEN 512
+
+struct iob {
+	int fd;		/*file descriptor*/
+	int cc;		/*char count*/
+	char *cp;	/*ptr to next char*/
+	char cbuf[BLEN];	/*char buffer*/
+} fin;
+
+getchar()
+{
+	char c;
+	register int i;
+
+	if(fin.fd==0) {
+		if(read(0,&c,1)<=0 || c==4)
+			return(0);
+		i = c;
+		return(i&0xff);
+	}
+	if(fin.cc<=0) {
+		fin.cp = &(fin.cbuf[0]);
+		fin.cc = read(fin.fd,fin.cp,BLEN);
+	}
+	if(fin.cc <= 0) {
+		return(0);
+	}
+	fin.cc--;
+	i = *(fin.cp)++;
+	return(i&0xff);
+}