3 * $Id: group-string.c,v 1.1 2004/04/01 12:50:09 mdw Exp $
5 * String I/O for group elements
7 * (c) 2004 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
14 * Catacomb is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * Catacomb is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with Catacomb; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
32 * $Log: group-string.c,v $
33 * Revision 1.1 2004/04/01 12:50:09 mdw
34 * Add cyclic group abstraction, with test code. Separate off exponentation
35 * functions for better static linking. Fix a buttload of bugs on the way.
36 * Generally ensure that negative exponents do inversion correctly. Add
37 * table of standard prime-field subgroups. (Binary field subgroups are
38 * currently unimplemented but easy to add if anyone ever finds a good one.)
42 /*----- Header files ------------------------------------------------------*/
46 /*----- Main code ---------------------------------------------------------*/
48 /* --- @group_readstring@ --- *
50 * Arguments: @group *g@ = an abstract group
51 * @ge *d@ = destination group element
52 * @const char *p@ = where the string is
53 * @char **end@ = where to put the end pointer
55 * Returns: Zero on success, nonzero on failure.
57 * Use: Parses a group element from a string.
60 int group_readstring(group
*g
, ge
*d
, const char *p
, char **end
)
64 ms
.buf
= (/*unconst*/ char *)p
;
65 ms
.lim
= (/*unconst*/ char *)p
+ strlen(p
);
66 if (G_READ(g
, d
, &mptext_stringops
, &ms
))
68 if (end
) *end
= ms
.buf
;
72 /* --- @group_writestring@ --- *
74 * Arguments: @group *g@ = an abstract group
75 * @ge *x@ = a group element
76 * @char *p@ = where the string should go
77 * @size_t sz@ = how long the buffer is
79 * Returns: Zero on success, nonzero on failure.
81 * Use: Writes a group element to a string buffer.
84 int group_writestring(group
*g
, ge
*x
, char *p
, size_t sz
)
90 if (G_WRITE(g
, x
, &mptext_stringops
, &ms
))
96 /*----- That's all, folks -------------------------------------------------*/