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/*
This file is part of TALER
Copyright (C) 2014 GNUnet e.V.
TALER is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
TALER 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with
TALER; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
/**
* @file util.c
* @brief Common utility functions; we might choose to move those to GNUnet at some point
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
* @author Florian Dold
* @author Benedikt Mueller
*/
#include "platform.h"
#include "taler_util.h"
#include <gcrypt.h>
/**
* Convert a buffer to an 8-character string
* representative of the contents. This is used
* for logging binary data when debugging.
*
* @param buf buffer to log
* @param buf_size number of bytes in @a buf
* @return text representation of buf, valid until next
* call to this function
*/
const char *
TALER_b2s (const void *buf,
size_t buf_size)
{
static char ret[9];
struct GNUNET_HashCode hc;
char *tmp;
GNUNET_CRYPTO_hash (buf,
buf_size,
&hc);
tmp = GNUNET_STRINGS_data_to_string_alloc (&hc,
sizeof (hc));
memcpy (ret,
tmp,
8);
GNUNET_free (tmp);
ret[8] = '\0';
return ret;
}
/**
* Obtain denomination amount from configuration file.
*
* @param cfg configuration to use
* @param section section of the configuration to access
* @param option option of the configuration to access
* @param[out] denom set to the amount found in configuration
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error
*/
int
TALER_config_get_denom (const struct GNUNET_CONFIGURATION_Handle *cfg,
const char *section,
const char *option,
struct TALER_Amount *denom)
{
char *str;
if (GNUNET_OK !=
GNUNET_CONFIGURATION_get_value_string (cfg,
section,
option,
&str))
return GNUNET_NO;
if (GNUNET_OK != TALER_string_to_amount (str,
denom))
{
GNUNET_free (str);
return GNUNET_SYSERR;
}
GNUNET_free (str);
return GNUNET_OK;
}
/**
* Set an option with an amount from the command line. A pointer to
* this function should be passed as part of the 'struct
* GNUNET_GETOPT_CommandLineOption' array to initialize options of
* this type.
*
* @param ctx command line processing context
* @param scls additional closure (will point to the `struct TALER_Amount`)
* @param option name of the option
* @param value actual value of the option as a string.
* @return #GNUNET_OK if parsing the value worked
*/
static int
set_amount (struct GNUNET_GETOPT_CommandLineProcessorContext *ctx,
void *scls,
const char *option,
const char *value)
{
struct TALER_Amount *amount = scls;
if (GNUNET_OK !=
TALER_string_to_amount (value,
amount))
{
FPRINTF (stderr,
_("Failed to parse amount in option `%s'\n"),
option);
return GNUNET_SYSERR;
}
return GNUNET_OK;
}
/**
* Allow user to specify an amount on the command line.
*
* @param shortName short name of the option
* @param name long name of the option
* @param argumentHelp help text for the option argument
* @param description long help text for the option
* @param[out] amount set to the amount specified at the command line
*/
struct GNUNET_GETOPT_CommandLineOption
TALER_getopt_get_amount (char shortName,
const char *name,
const char *argumentHelp,
const char *description,
struct TALER_Amount *amount)
{
struct GNUNET_GETOPT_CommandLineOption clo = {
.shortName = shortName,
.name = name,
.argumentHelp = argumentHelp,
.description = description,
.require_argument = 1,
.processor = &set_amount,
.scls = (void *) amount
};
return clo;
}
/* end of util.c */
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