84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
/*
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This file is part of TALER
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(C) 2018 Taler Systems SA
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TALER is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3,
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or (at your option) any later version.
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TALER is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with TALER; see the file COPYING. If not, see
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<http://www.gnu.org/licenses/>
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*/
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/**
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* @file wire/wire_helper.c
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* @brief Helper functions for dealing with wire formats
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* @author Christian Grothoff <christian@grothoff.org>
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*/
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#include "platform.h"
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#include "taler_util.h"
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#include "taler_wire_lib.h"
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/**
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* Prefix of PAYTO URLs.
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*/
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#define PAYTO "payto://"
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/**
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* Obtain the payment method from a @a payto_url
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*
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* @param payto_url the URL to parse
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* @return NULL on error (malformed @a payto_url)
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*/
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char *
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TALER_WIRE_payto_get_method (const char *payto_url)
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{
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const char *start;
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const char *end;
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if (0 != strncmp (payto_url,
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PAYTO,
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strlen (PAYTO)))
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return NULL;
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start = &payto_url[strlen (PAYTO)];
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end = strchr (start,
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(unsigned char) '/');
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if (NULL == end)
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return NULL;
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return GNUNET_strndup (start,
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end - start);
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}
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/**
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* Round the amount to something that can be
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* transferred on the wire.
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*
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* @param[in,out] amount amount to round down
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* @return #GNUNET_OK on success, #GNUNET_NO if rounding was unnecessary,
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* #GNUNET_SYSERR if the amount or currency was invalid
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*/
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int
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TALER_WIRE_amount_round (struct TALER_Amount *amount)
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{
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uint32_t delta;
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delta = amount->fraction % (TALER_AMOUNT_FRAC_BASE / 100);
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if (0 == delta)
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return GNUNET_NO;
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amount->fraction -= delta;
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return GNUNET_OK;
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}
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/* end of wire_helper.c */
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