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-rw-r--r--libguile/read.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/libguile/read.c b/libguile/read.c
index d1e1be372..382a1d379 100644
--- a/libguile/read.c
+++ b/libguile/read.c
@@ -2157,6 +2157,10 @@ set_port_read_option (SCM port, int option, int new_value)
unsigned int read_options;
new_value &= READ_OPTION_MASK;
+
+ scm_dynwind_begin (0);
+ scm_dynwind_lock_port (port);
+
scm_read_options = scm_i_port_property (port, sym_port_read_options);
if (scm_is_unsigned_integer (scm_read_options, 0, READ_OPTIONS_MAX_VALUE))
read_options = scm_to_uint (scm_read_options);
@@ -2166,6 +2170,8 @@ set_port_read_option (SCM port, int option, int new_value)
read_options |= new_value << option;
scm_read_options = scm_from_uint (read_options);
scm_i_set_port_property_x (port, sym_port_read_options, scm_read_options);
+
+ scm_dynwind_end ();
}
/* Set OPTS and PORT's case-insensitivity according to VALUE. */