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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, 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 (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))
return GNUNET_SYSERR;
return GNUNET_OK;
}
/**
* Load configuration by parsing all configuration
* files in the given directory.
*
* @param base_dir directory with the configuration files
* @return NULL on error, otherwise configuration
*/
struct GNUNET_CONFIGURATION_Handle *
TALER_config_load (const char *base_dir)
{
struct GNUNET_CONFIGURATION_Handle *cfg;
char *cfg_dir;
int res;
res = GNUNET_asprintf (&cfg_dir,
"%s" DIR_SEPARATOR_STR "config",
base_dir);
GNUNET_assert (res > 0);
cfg = GNUNET_CONFIGURATION_create ();
res = GNUNET_CONFIGURATION_load_from (cfg, cfg_dir);
GNUNET_free (cfg_dir);
if (GNUNET_OK != res)
return NULL;
return cfg;
}
/**
* At what offset does the help text start?
*/
#define BORDER 29
/**
* Print out details on command line options (implements --help).
*
* @param ctx command line processing context
* @param scls additional closure (points to about text)
* @param option name of the option
* @param value not used (NULL)
* @return #GNUNET_NO (do not continue, not an error)
*/
int
TALER_GETOPT_format_help_ (struct GNUNET_GETOPT_CommandLineProcessorContext *ctx,
void *scls,
const char *option,
const char *value)
{
const char *about = scls;
size_t slen;
unsigned int i;
int j;
size_t ml;
size_t p;
char *scp;
const char *trans;
const struct GNUNET_GETOPT_CommandLineOption *opt;
if (NULL != about)
{
printf ("%s\n%s\n",
ctx->binaryOptions,
gettext (about));
printf (_("Arguments mandatory for long options are also mandatory for short options.\n"));
}
opt = ctx->allOptions;
for (i=0;NULL != opt[i].description;i++)
{
if (opt[i].shortName == '\0')
printf (" ");
else
printf (" -%c, ", opt[i].shortName);
printf ("--%s", opt[i].name);
slen = 8 + strlen (opt[i].name);
if (opt[i].argumentHelp != NULL)
{
printf ("=%s", opt[i].argumentHelp);
slen += 1 + strlen (opt[i].argumentHelp);
}
if (slen > BORDER)
{
printf ("\n%*s", BORDER, "");
slen = BORDER;
}
if (slen < BORDER)
{
printf ("%*s", (int) (BORDER - slen), "");
slen = BORDER;
}
if (0 < strlen (opt[i].description))
trans = gettext (opt[i].description);
else
trans = "";
ml = strlen (trans);
p = 0;
OUTER:
while (ml - p > 78 - slen)
{
for (j = p + 78 - slen; j > p; j--)
{
if (isspace ((unsigned char) trans[j]))
{
scp = GNUNET_malloc (j - p + 1);
memcpy (scp, &trans[p], j - p);
scp[j - p] = '\0';
printf ("%s\n%*s", scp, BORDER + 2, "");
GNUNET_free (scp);
p = j + 1;
slen = BORDER + 2;
goto OUTER;
}
}
/* could not find space to break line */
scp = GNUNET_malloc (78 - slen + 1);
memcpy (scp, &trans[p], 78 - slen);
scp[78 - slen] = '\0';
printf ("%s\n%*s", scp, BORDER + 2, "");
GNUNET_free (scp);
slen = BORDER + 2;
p = p + 78 - slen;
}
/* print rest */
if (p < ml)
printf ("%s\n", &trans[p]);
if (strlen (trans) == 0)
printf ("\n");
}
printf ("Report bugs to taler@gnu.org.\n"
"Taler home page: http://www.gnu.org/software/taler/\n"
"General help using GNU software: http://www.gnu.org/gethelp/\n");
return GNUNET_NO;
}
/* end of util.c */
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