First draft of Unicode support in pterm. It's pretty complete: it

[u/mdw/putty] / charset / sbcs.c

diff --git a/charset/sbcs.c b/charset/sbcs.c
new file mode 100644 (file)
index 0000000..a71e5d8
--- /dev/null
+++ b/charset/sbcs.c
@@ -0,0 +1,45 @@
+/*
+ * sbcs.c - routines to handle single-byte character sets.
+ */
+
+#include "charset.h"
+#include "internal.h"
+
+/*
+ * The charset_spec for any single-byte character set should
+ * provide read_sbcs() as its read function, and its `data' field
+ * should be a wchar_t string constant containing the 256 entries
+ * of the translation table.
+ */
+
+void read_sbcs(charset_spec const *charset, long int input_chr,
+              charset_state *state,
+              void (*emit)(void *ctx, long int output), void *emitctx)
+{
+    wchar_t const *table = (wchar_t const *)charset->data;
+
+    UNUSEDARG(state);
+
+    emit(emitctx, table[input_chr]);
+}
+
+void write_sbcs(charset_spec const *charset, long int input_chr,
+               charset_state *state,
+               void (*emit)(void *ctx, long int output), void *emitctx)
+{
+    wchar_t const *table = (wchar_t const *)charset->data;
+    int i;
+
+    UNUSEDARG(state);
+
+    /*
+     * FIXME: this should work, but it's ludicrously inefficient.
+     * We should be using the ucs2sbcs table.
+     */
+    for (i = 0; i < 256; i++)
+       if (table[i] == input_chr) {
+           emit(emitctx, i);
+           return;
+       }
+    emit(emitctx, ERROR);
+}