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

diff --git a/math/group-string.c b/math/group-string.c
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+/* -*-c-*-
+ *
+ * String I/O for group elements
+ *
+ * (c) 2004 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 "group.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @group_readstring@ --- *
+ *
+ * Arguments:	@group *g@ = an abstract group
+ *		@ge *d@ = destination group element
+ *		@const char *p@ = where the string is
+ *		@char **end@ = where to put the end pointer
+ *
+ * Returns:	Zero on success, nonzero on failure.
+ *
+ * Use:		Parses a group element from a string.
+ */
+
+int group_readstring(group *g, ge *d, const char *p, char **end)
+{
+  mptext_stringctx ms;
+
+  ms.buf = (/*unconst*/ char *)p;
+  ms.lim = (/*unconst*/ char *)p + strlen(p);
+  if (G_READ(g, d, &mptext_stringops, &ms))
+    return (-1);
+  if (end) *end = ms.buf;
+  return (0);
+}
+
+/* --- @group_writestring@ --- *
+ *
+ * Arguments:	@group *g@ = an abstract group
+ *		@ge *x@ = a group element
+ *		@char *p@ = where the string should go
+ *		@size_t sz@ = how long the buffer is
+ *
+ * Returns:	Zero on success, nonzero on failure.
+ *
+ * Use:		Writes a group element to a string buffer.
+ */
+
+int group_writestring(group *g, ge *x, char *p, size_t sz)
+{
+  mptext_stringctx ms;
+
+  ms.buf = p;
+  ms.lim = p + sz - 1;
+  if (G_WRITE(g, x, &mptext_stringops, &ms))
+    return (-1);
+  *ms.buf = 0;
+  return (0);
+}
+
+/*----- That's all, folks -------------------------------------------------*/