Initial import.

src/cmd/sam/sys.c

@@ -0,0 +1,60 @@
+#include "sam.h"
+
+static int inerror=FALSE;
+
+/*
+ * A reasonable interface to the system calls
+ */
+
+void
+resetsys(void)
+{
+	inerror = FALSE;
+}
+
+void
+syserror(char *a)
+{
+	char buf[ERRMAX];
+
+	if(!inerror){
+		inerror=TRUE;
+		errstr(buf, sizeof buf);
+		dprint("%s: ", a);
+		error_s(Eio, buf);
+	}
+}
+
+int
+Read(int f, void *a, int n)
+{
+	char buf[ERRMAX];
+
+	if(read(f, (char *)a, n)!=n) {
+		if (lastfile)
+			lastfile->rescuing = 1;
+		errstr(buf, sizeof buf);
+		if (downloaded)
+			fprint(2, "read error: %s\n", buf);
+		rescue();
+		exits("read");
+	}
+	return n;
+}
+
+int
+Write(int f, void *a, int n)
+{
+	int m;
+
+	if((m=write(f, (char *)a, n))!=n)
+		syserror("write");
+	return m;
+}
+
+void
+Seek(int f, long n, int w)
+{
+	if(seek(f, n, w)==-1)
+		syserror("seek");
+}