1 files changed, 85 insertions, 0 deletions
diff --git a/unix/boot/spp/rpp/rpprat/iferrc.r b/unix/boot/spp/rpp/rpprat/iferrc.r
new file mode 100644
index 00000000..4fd77154
--- /dev/null
+++ b/unix/boot/spp/rpp/rpprat/iferrc.r
@@ -0,0 +1,85 @@
+include  defs
+
+# IFERRC - Generate initial code for an IFERR statement.  Used to provide
+# error recovery for a statement or compound statement.
+
+subroutine iferrc (lab, sense)	
+
+integer lab, sense
+integer labgen, nlpar
+character t, gettok, gnbtok, token(MAXTOK)
+include COMMON_BLOCKS
+string	errpsh "call xerpsh"
+string	siferr "if (.not.xerpop()) "
+string	sifnoerr "if (xerpop()) "
+
+	xfer = NO
+	lab = labgen (3)
+
+	call outtab					# "call errpsh"
+	call outstr (errpsh)
+	call outdon
+
+	switch (gnbtok (token, MAXTOK)) {		# "iferr (" or "iferr {"
+	case LPAREN:
+	    call outtab
+	case LBRACE:
+	    call pbstr (token)
+	    esp = esp + 1
+	    if (esp >= MAXERRSTK)			# not likely
+		call baderr ("Iferr statements nested too deeply.")
+	    errstk(esp) = lab
+	    return
+	default:
+	    call synerr ("Missing left paren.")
+	    return
+	}
+
+	nlpar = 1					# process "iferr (.."
+	token(1) = EOS
+
+	# Push handler on error stack temporarily so that "iferr (call error.."
+	# can be handled properly.
+	esp = esp + 1
+	if (esp >= MAXERRSTK)				# not likely
+	    call baderr ("Iferr statements nested too deeply.")
+	errstk(esp) = 0
+	
+	repeat {					# output the statement
+	    call outstr (token)
+	    t = gettok (token, MAXTOK)
+	    if (t == SEMICOL | t == LBRACE | t == RBRACE | t == EOF) {
+		call pbstr (token)
+		break
+	    }
+	    if (t == NEWLINE)      			# delete newlines
+		token (1) = EOS
+	    else if (t == LPAREN)
+		nlpar = nlpar + 1
+	    else if (t == RPAREN)
+		nlpar = nlpar - 1
+	    else if (t == SEMICOL) {
+		call outdon
+		call outtab
+	    } else if (t == ALPHA)
+		call squash (token)
+	    # else nothing special
+	} until (nlpar <= 0)
+	
+	esp = esp - 1
+	ername = NO					# ignore errchk
+	if (nlpar != 0)
+	    call synerr ("Missing parenthesis in condition.")
+	else
+	    call outdon
+	
+	call outtab					# "if (errpop())"
+	if (sense == 1)
+	    call outstr (siferr)
+	else
+	    call outstr (sifnoerr)
+	call outgo (lab)				# "... goto lab"
+
+	call indent (1)
+	return
+end