X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/ba6e6b64033b1f9de49feccb5c9cd438354481f7..0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a:/math/mptext-dstr.c

diff --git a/math/mptext-dstr.c b/math/mptext-dstr.c
new file mode 100644
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+++ b/math/mptext-dstr.c
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+/* -*-c-*-
+ *
+ * Reading and writing large integers on strings
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/dstr.h>
+
+#include "mptext.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- Operations table --- */
+
+static int get(void *p)
+{
+  mptext_dstrctx *c = p;
+  if (c->i >= c->d->len)
+    return (EOF);
+  return ((unsigned char)c->d->buf[c->i++]);
+}
+
+static void unget(int ch, void *p)
+{
+  mptext_dstrctx *c = p;
+  if (ch == EOF || c->i == 0)
+    return;
+  c->i--;
+}
+
+static int put(const char *s, size_t sz, void *p)
+{
+  mptext_dstrctx *c = p;
+  DPUTM(c->d, s, sz);
+  return (0);
+}
+
+const mptext_ops mptext_dstrops = { get, unget, put };
+
+/* --- Convenience functions --- */
+
+mp *mp_readdstr(mp *m, dstr *d, size_t *off, int radix)
+{
+  mptext_dstrctx c;
+  c.d = d;
+  c.i = off ? *off : 0;
+  m = mp_read(m, radix, &mptext_dstrops, &c);
+  if (off)
+    *off = c.i;
+  return (m);
+}
+
+int mp_writedstr(mp *m, dstr *d, int radix)
+{
+  mptext_dstrctx c;
+  int rc;
+  c.d = d;
+  rc = mp_write(m, radix, &mptext_dstrops, &c);
+  DPUTZ(d);
+  return (rc);
+}
+
+/*----- That's all, folks -------------------------------------------------*/