329 lines
7.4 KiB
C++
329 lines
7.4 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of LibMaxsi.
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LibMaxsi is free software: you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the Free
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Software Foundation, either version 3 of the License, or (at your option)
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any later version.
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LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
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format.cpp
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Provides printf formatting functions that uses callbacks.
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******************************************************************************/
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#include <libmaxsi/platform.h>
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#include <libmaxsi/string.h>
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#include <libmaxsi/format.h>
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namespace Maxsi
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{
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namespace String
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{
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int ConvertInt32(int32_t num, char* dest)
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{
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int result = 0;
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int32_t copy = num;
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if ( num < 0 )
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{
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*dest++ = '-';
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result++;
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int offset = 0;
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while ( copy < -9 ) { copy /= 10; offset++; }
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result += offset;
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while ( offset >= 0 )
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{
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dest[offset] = '0' - num % 10; num /= 10; offset--;
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}
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}
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else
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{
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int offset = 0;
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while ( copy > 9 ) { copy /= 10; offset++; }
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result += offset;
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while ( offset >= 0 )
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{
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dest[offset] = '0' + num % 10; num /= 10; offset--;
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}
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}
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return result + 1;
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}
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int ConvertInt64(int64_t num, char* dest)
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{
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int result = 0;
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int64_t copy = num;
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if ( num < 0 )
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{
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*dest++ = '-';
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result++;
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int offset = 0;
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while ( copy < -9 ) { copy /= 10; offset++; }
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result += offset;
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while ( offset >= 0 )
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{
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dest[offset] = '0' - num % 10; num /= 10; offset--;
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}
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}
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else
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{
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int offset = 0;
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while ( copy > 9 ) { copy /= 10; offset++; }
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result += offset;
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while ( offset >= 0 )
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{
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dest[offset] = '0' + num % 10; num /= 10; offset--;
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}
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}
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return result + 1;
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}
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int ConvertUInt32(uint32_t num, char* dest)
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{
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int result = 0;
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uint32_t copy = num;
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int offset = 0;
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while ( copy > 9 ) { copy /= 10; offset++; }
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result += offset;
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while ( offset >= 0 )
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{
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dest[offset] = '0' + num % 10; num /= 10; offset--;
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}
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return result + 1;
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}
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int ConvertUInt64(uint64_t num, char* dest)
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{
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int result = 0;
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uint64_t copy = num;
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int offset = 0;
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while ( copy > 9 ) { copy /= 10; offset++; }
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result += offset;
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while ( offset >= 0 )
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{
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dest[offset] = '0' + num % 10; num /= 10; offset--;
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}
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return result + 1;
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}
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int ConvertUInt32Hex(uint32_t num, char* dest)
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{
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char chars[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'A', 'B', 'C', 'D', 'E', 'F' };
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int result = 0;
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uint32_t copy = num;
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int offset = 0;
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while ( copy > 15 ) { copy /= 16; offset++; }
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result += offset;
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while ( offset >= 0 )
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{
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dest[offset] = chars[num % 16]; num /= 16; offset--;
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}
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return result + 1;
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}
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int ConvertUInt64Hex(uint64_t num, char* dest)
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{
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char chars[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
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'A', 'B', 'C', 'D', 'E', 'F' };
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int result = 0;
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uint64_t copy = num;
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int offset = 0;
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while ( copy > 15 ) { copy /= 16; offset++; }
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result += offset;
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while ( offset >= 0 )
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{
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dest[offset] = chars[num % 16]; num /= 16; offset--;
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}
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return result + 1;
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}
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}
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namespace Format
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{
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#define READY_SIZE 128
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#define READY_FLUSH() \
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ready[readylen] = '\0'; \
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if ( 0 < readylen && callback && callback(user, ready, readylen) != readylen ) { return SIZE_MAX; } \
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written += readylen; readylen = 0;
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size_t Virtual(Callback callback, void* user, const char* format, va_list parameters)
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{
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size_t written = 0;
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size_t readylen = 0;
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char ready[READY_SIZE + 1];
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while ( *format != '\0' )
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{
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char c = *(format++);
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if ( c != '%' )
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{
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if ( READY_SIZE <= readylen ) { READY_FLUSH(); }
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ready[readylen++] = c;
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continue;
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}
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if ( *format == '%' ) { continue; }
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const nat UNSIGNED = 0;
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const nat INTEGER = (1<<0);
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const nat BIT64 = (1<<1);
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const nat HEX = (1<<2);
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const nat STRING = 8;
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const nat CHARACTER = 9;
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#ifdef PLATFORM_X64
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const nat WORDWIDTH = BIT64;
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#else
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const nat WORDWIDTH = 0;
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#endif
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// TODO: Support signed datatypes!
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nat type = 0;
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bool scanning = true;
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while ( scanning )
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{
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switch( *(format++) )
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{
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case '3':
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case '2':
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break;
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case '6':
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case '4':
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type |= BIT64;
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break;
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case 'p':
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type = WORDWIDTH | HEX;
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scanning = false;
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break;
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case 't':
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type |= INTEGER;
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case 'z':
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case 'l':
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if ( type & WORDWIDTH ) { type |= BIT64; }
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type |= WORDWIDTH;
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break;
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case 'j':
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type |= BIT64;
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break;
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case 'u':
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type |= UNSIGNED;
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scanning = false;
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break;
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case 'd':
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case 'i':
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type |= INTEGER;
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scanning = false;
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break;
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case 'x':
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type |= HEX;
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scanning = false;
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break;
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case 's':
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type = STRING;
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scanning = false;
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break;
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case 'c':
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type = CHARACTER;
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scanning = false;
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break;
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default:
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return SIZE_MAX;
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}
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}
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switch ( type )
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{
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case INTEGER:
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{
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if ( READY_SIZE - readylen < 10 ) { READY_FLUSH(); }
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int32_t num = va_arg(parameters, int32_t);
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readylen += String::ConvertInt32(num, ready + readylen);
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break;
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}
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case UNSIGNED:
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{
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if ( READY_SIZE - readylen < 10 ) { READY_FLUSH(); }
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uint32_t num = va_arg(parameters, uint32_t);
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readylen += String::ConvertUInt32(num, ready + readylen);
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break;
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}
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case INTEGER | BIT64:
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{
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if ( READY_SIZE - readylen < 10 ) { READY_FLUSH(); }
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int64_t num = va_arg(parameters, int64_t);
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readylen += String::ConvertInt64(num, ready + readylen);
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break;
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}
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case UNSIGNED | BIT64:
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{
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if ( READY_SIZE - readylen < 20 ) { READY_FLUSH(); }
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uint64_t num = va_arg(parameters, uint64_t);
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readylen += String::ConvertUInt64(num, ready + readylen);
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break;
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}
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case INTEGER | HEX:
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case UNSIGNED | HEX:
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{
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if ( READY_SIZE - readylen < 8 ) { READY_FLUSH(); }
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uint32_t num = va_arg(parameters, uint32_t);
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readylen += String::ConvertUInt32Hex(num, ready + readylen);
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break;
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}
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case INTEGER | BIT64 | HEX:
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case UNSIGNED | BIT64 | HEX:
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{
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if ( READY_SIZE - readylen < 16 ) { READY_FLUSH(); }
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uint64_t num = va_arg(parameters, uint64_t);
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readylen += String::ConvertUInt64Hex(num, ready + readylen);
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break;
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}
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case STRING:
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{
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READY_FLUSH();
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const char* str = va_arg(parameters, const char*);
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size_t len = String::Length(str);
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if ( callback && callback(user, str, len) != len ) { return SIZE_MAX; }
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written += len;
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break;
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}
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case CHARACTER:
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{
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int c = va_arg(parameters, int);
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if ( READY_SIZE <= readylen ) { READY_FLUSH(); }
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ready[readylen++] = c;
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break;
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}
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}
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}
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READY_FLUSH();
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return written;
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}
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}
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}
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