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sortix--sortix/libmaxsi/format.cpp

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/******************************************************************************
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
This file is part of LibMaxsi.
LibMaxsi is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
LibMaxsi 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 Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
format.cpp
Provides printf formatting functions that uses callbacks.
******************************************************************************/
#include <libmaxsi/platform.h>
#include <libmaxsi/string.h>
#include <libmaxsi/format.h>
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namespace Maxsi
{
namespace String
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{
int ConvertInt32(int32_t num, char* dest)
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{
int result = 0;
int32_t copy = num;
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if ( num < 0 )
{
*dest++ = '-';
result++;
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int offset = 0;
while ( copy < -9 ) { copy /= 10; offset++; }
result += offset;
while ( offset >= 0 )
{
dest[offset] = '0' - num % 10; num /= 10; offset--;
}
}
else
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{
int offset = 0;
while ( copy > 9 ) { copy /= 10; offset++; }
result += offset;
while ( offset >= 0 )
{
dest[offset] = '0' + num % 10; num /= 10; offset--;
}
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}
return result + 1;
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}
int ConvertInt64(int64_t num, char* dest)
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{
int result = 0;
int64_t copy = num;
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if ( num < 0 )
{
*dest++ = '-';
result++;
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int offset = 0;
while ( copy < -9 ) { copy /= 10; offset++; }
result += offset;
while ( offset >= 0 )
{
dest[offset] = '0' - num % 10; num /= 10; offset--;
}
}
else
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{
int offset = 0;
while ( copy > 9 ) { copy /= 10; offset++; }
result += offset;
while ( offset >= 0 )
{
dest[offset] = '0' + num % 10; num /= 10; offset--;
}
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}
return result + 1;
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}
int ConvertUInt32(uint32_t num, char* dest)
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{
int result = 0;
uint32_t copy = num;
int offset = 0;
while ( copy > 9 ) { copy /= 10; offset++; }
result += offset;
while ( offset >= 0 )
{
dest[offset] = '0' + num % 10; num /= 10; offset--;
}
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return result + 1;
}
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int ConvertUInt64(uint64_t num, char* dest)
{
int result = 0;
uint64_t copy = num;
int offset = 0;
while ( copy > 9 ) { copy /= 10; offset++; }
result += offset;
while ( offset >= 0 )
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{
dest[offset] = '0' + num % 10; num /= 10; offset--;
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}
return result + 1;
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}
int ConvertUInt32Hex(uint32_t num, char* dest)
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{
char chars[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F' };
int result = 0;
uint32_t copy = num;
int offset = 0;
while ( copy > 15 ) { copy /= 16; offset++; }
result += offset;
while ( offset >= 0 )
{
dest[offset] = chars[num % 16]; num /= 16; offset--;
}
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return result + 1;
}
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int ConvertUInt64Hex(uint64_t num, char* dest)
{
char chars[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F' };
int result = 0;
uint64_t copy = num;
int offset = 0;
while ( copy > 15 ) { copy /= 16; offset++; }
result += offset;
while ( offset >= 0 )
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{
dest[offset] = chars[num % 16]; num /= 16; offset--;
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}
return result + 1;
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}
}
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namespace Format
{
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#define READY_SIZE 128
#define READY_FLUSH() \
ready[readylen] = '\0'; \
if ( 0 < readylen && callback && callback(user, ready, readylen) != readylen ) { return SIZE_MAX; } \
written += readylen; readylen = 0;
size_t Virtual(Callback callback, void* user, const char* format, va_list parameters)
{
size_t written = 0;
size_t readylen = 0;
char ready[READY_SIZE + 1];
while ( *format != '\0' )
{
char c = *(format++);
if ( c != '%' )
{
if ( READY_SIZE <= readylen ) { READY_FLUSH(); }
ready[readylen++] = c;
continue;
}
if ( *format == '%' ) { continue; }
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const nat UNSIGNED = 0;
const nat INTEGER = (1<<0);
const nat BIT64 = (1<<1);
const nat HEX = (1<<2);
const nat STRING = 8;
const nat CHARACTER = 9;
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#ifdef PLATFORM_X64
const nat WORDWIDTH = BIT64;
#else
const nat WORDWIDTH = 0;
#endif
// TODO: Support signed datatypes!
nat type = 0;
bool scanning = true;
while ( scanning )
{
switch( *(format++) )
{
case '3':
case '2':
break;
case '6':
case '4':
type |= BIT64;
break;
case 'p':
type = WORDWIDTH | HEX;
scanning = false;
break;
case 't':
type |= INTEGER;
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case 'z':
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case 'l':
if ( type & WORDWIDTH ) { type |= BIT64; }
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type |= WORDWIDTH;
break;
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case 'j':
type |= BIT64;
break;
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case 'u':
type |= UNSIGNED;
scanning = false;
break;
case 'd':
case 'i':
type |= INTEGER;
scanning = false;
break;
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case 'x':
type |= HEX;
scanning = false;
break;
case 's':
type = STRING;
scanning = false;
break;
case 'c':
type = CHARACTER;
scanning = false;
break;
default:
return SIZE_MAX;
}
}
switch ( type )
{
case INTEGER:
{
if ( READY_SIZE - readylen < 10 ) { READY_FLUSH(); }
int32_t num = va_arg(parameters, int32_t);
readylen += String::ConvertInt32(num, ready + readylen);
break;
}
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case UNSIGNED:
{
if ( READY_SIZE - readylen < 10 ) { READY_FLUSH(); }
uint32_t num = va_arg(parameters, uint32_t);
readylen += String::ConvertUInt32(num, ready + readylen);
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break;
}
case INTEGER | BIT64:
{
if ( READY_SIZE - readylen < 10 ) { READY_FLUSH(); }
int64_t num = va_arg(parameters, int64_t);
readylen += String::ConvertInt64(num, ready + readylen);
break;
}
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case UNSIGNED | BIT64:
{
if ( READY_SIZE - readylen < 20 ) { READY_FLUSH(); }
uint64_t num = va_arg(parameters, uint64_t);
readylen += String::ConvertUInt64(num, ready + readylen);
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break;
}
case INTEGER | HEX:
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case UNSIGNED | HEX:
{
if ( READY_SIZE - readylen < 8 ) { READY_FLUSH(); }
uint32_t num = va_arg(parameters, uint32_t);
readylen += String::ConvertUInt32Hex(num, ready + readylen);
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break;
}
case INTEGER | BIT64 | HEX:
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case UNSIGNED | BIT64 | HEX:
{
if ( READY_SIZE - readylen < 16 ) { READY_FLUSH(); }
uint64_t num = va_arg(parameters, uint64_t);
readylen += String::ConvertUInt64Hex(num, ready + readylen);
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break;
}
case STRING:
{
READY_FLUSH();
const char* str = va_arg(parameters, const char*);
size_t len = String::Length(str);
if ( callback && callback(user, str, len) != len ) { return SIZE_MAX; }
written += len;
break;
}
case CHARACTER:
{
int c = va_arg(parameters, int);
if ( READY_SIZE <= readylen ) { READY_FLUSH(); }
ready[readylen++] = c;
break;
}
}
}
READY_FLUSH();
return written;
}
}
}