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/* Lziprecover - Data recovery tool for the lzip format
Copyright (C) 2009-2018 Antonio Diaz Diaz.
This program 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 2 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace {
const char * const program_year = "2018";
void show_version()
{
std::printf( "%s %s\n", program_name, PROGVERSION );
std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
std::printf( "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>\n"
"This is free software: you are free to change and redistribute it.\n"
"There is NO WARRANTY, to the extent permitted by law.\n" );
}
// Recognized formats: <num>[YZEPTGM][i][Bs], <num>k[Bs], <num>Ki[Bs]
//
long long getnum( const char * const ptr, const int hardbs,
const long long llimit = -LLONG_MAX,
const long long ulimit = LLONG_MAX,
const char ** const tailp = 0 )
{
char * tail;
errno = 0;
long long result = strtoll( ptr, &tail, 0 );
if( tail == ptr )
{
show_error( "Bad or missing numerical argument.", 0, true );
std::exit( 1 );
}
if( !errno && tail[0] )
{
char * const p = tail++;
int factor = 1000; // default factor
int exponent = -1; // -1 = bad multiplier
char usuf = 0; // 'B' or 's' unit suffix is present
switch( *p )
{
case 'Y': exponent = 8; break;
case 'Z': exponent = 7; break;
case 'E': exponent = 6; break;
case 'P': exponent = 5; break;
case 'T': exponent = 4; break;
case 'G': exponent = 3; break;
case 'M': exponent = 2; break;
case 'K': if( tail[0] == 'i' ) { ++tail; factor = 1024; exponent = 1; } break;
case 'k': if( tail[0] != 'i' ) exponent = 1; break;
case 'B':
case 's': usuf = *p; exponent = 0; break;
default : if( tailp ) { tail = p; exponent = 0; } break;
}
if( exponent > 1 && tail[0] == 'i' ) { ++tail; factor = 1024; }
if( exponent > 0 && usuf == 0 && ( tail[0] == 'B' || tail[0] == 's' ) )
{ usuf = tail[0]; ++tail; }
if( exponent < 0 || ( usuf == 's' && hardbs <= 0 ) ||
( !tailp && tail[0] != 0 ) )
{
show_error( "Bad multiplier in numerical argument.", 0, true );
std::exit( 1 );
}
for( int i = 0; i < exponent; ++i )
{
if( LLONG_MAX / factor >= llabs( result ) ) result *= factor;
else { errno = ERANGE; break; }
}
if( usuf == 's' )
{
if( LLONG_MAX / hardbs >= llabs( result ) ) result *= hardbs;
else errno = ERANGE;
}
}
if( !errno && ( result < llimit || result > ulimit ) ) errno = ERANGE;
if( errno )
{
show_error( "Numerical argument out of limits." );
std::exit( 1 );
}
if( tailp ) *tailp = tail;
return result;
}
} // end namespace
void show_error( const char * const msg, const int errcode, const bool help )
{
if( verbosity < 0 ) return;
if( msg && msg[0] )
{
std::fprintf( stderr, "%s: %s", program_name, msg );
if( errcode > 0 ) std::fprintf( stderr, ": %s", std::strerror( errcode ) );
std::fputc( '\n', stderr );
}
if( help )
std::fprintf( stderr, "Try '%s --help' for more information.\n",
invocation_name );
}
void internal_error( const char * const msg )
{
if( verbosity >= 0 )
std::fprintf( stderr, "%s: internal error: %s\n", program_name, msg );
std::exit( 3 );
}
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