+/* -*-c-*-
+ *
+ * $Id: mptext-string.c,v 1.1 1999/11/17 18:02:16 mdw Exp $
+ *
+ * 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.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: mptext-string.c,v $
+ * Revision 1.1 1999/11/17 18:02:16 mdw
+ * New multiprecision integer arithmetic suite.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <string.h>
+
+#include "mptext.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- Operations table --- */
+
+static int get(void *p)
+{
+ mptext_stringctx *c = p;
+ if (c->buf >= c->lim)
+ return (EOF);
+ return (*c->buf++);
+}
+
+static void unget(int ch, void *p)
+{
+ mptext_stringctx *c = p;
+ if (ch != EOF)
+ c->buf--;
+}
+
+static int put(char *s, size_t sz, void *p)
+{
+ mptext_stringctx *c = p;
+ int rc = 0;
+ if (sz > c->lim - c->buf) {
+ sz = c->lim - c->buf;
+ rc = EOF;
+ }
+ if (sz) {
+ memcpy(c->buf, s, sz);
+ c->buf += sz;
+ }
+ return (rc);
+}
+
+const mptext_ops mptext_stringops = { get, unget, put };
+
+/* --- Convenience functions --- */
+
+mp *mp_readstring(mp *m, const char *p, char **end, int radix)
+{
+ mptext_stringctx c;
+ c.buf = (char *)p;
+ c.lim = c.buf + strlen(p);
+ m = mp_read(m, radix, &mptext_stringops, &c);
+ if (end)
+ *end = c.buf;
+ return (m);
+}
+
+int mp_writestring(mp *m, char *p, size_t sz, int radix)
+{
+ mptext_stringctx c;
+ int rc;
+ if (!sz)
+ return (0);
+ c.buf = p;
+ c.lim = p + sz - 1;
+ rc = mp_write(m, radix, &mptext_stringops, &c);
+ *c.buf = 0;
+ return (rc);
+}
+
+/*----- That's all, folks -------------------------------------------------*/