72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
/* Tarlz - Archiver with multimember lzip compression
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Copyright (C) 2013-2025 Antonio Diaz Diaz.
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This program 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 published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but 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 License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#define _FILE_OFFSET_BITS 64
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#include <cctype>
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#include <cerrno>
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#include <unistd.h>
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#include "tarlz.h"
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unsigned long long parse_octal( const uint8_t * const ptr, const int size )
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{
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unsigned long long result = 0;
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int i = 0;
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while( i < size && std::isspace( ptr[i] ) ) ++i;
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for( ; i < size && ptr[i] >= '0' && ptr[i] <= '7'; ++i )
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{ result <<= 3; result += ptr[i] - '0'; }
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return result;
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}
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/* Return the number of bytes really read.
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If (value returned < size) and (errno == 0), means EOF was reached.
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*/
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int readblock( const int fd, uint8_t * const buf, const int size )
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{
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int sz = 0;
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errno = 0;
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while( sz < size )
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{
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const int n = read( fd, buf + sz, size - sz );
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if( n > 0 ) sz += n;
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else if( n == 0 ) break; // EOF
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else if( errno != EINTR ) break;
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errno = 0;
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}
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return sz;
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}
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/* Return the number of bytes really written.
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If (value returned < size), it is always an error.
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*/
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int writeblock( const int fd, const uint8_t * const buf, const int size )
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{
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int sz = 0;
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errno = 0;
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while( sz < size )
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{
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const int n = write( fd, buf + sz, size - sz );
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if( n > 0 ) sz += n;
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else if( n < 0 && errno != EINTR ) break;
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errno = 0;
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}
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return sz;
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}
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