portapack-mayhem/firmware/application/string_format.cpp
2015-12-02 13:38:17 -08:00

115 lines
2.3 KiB
C++

/*
* Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
*
* This file is part of PortaPack.
*
* 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, 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; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "string_format.hpp"
static char* to_string_dec_uint_internal(
char* p,
uint32_t n
) {
*p = 0;
auto q = p;
do {
const uint32_t d = n % 10;
const char c = d + 48;
*(--q) = c;
n /= 10;
} while( n != 0 );
return q;
}
static char* to_string_dec_uint_pad_internal(
char* const term,
const uint32_t n,
const int32_t l,
const char fill
) {
auto q = to_string_dec_uint_internal(term, n);
if( fill ) {
while( (term - q) < l ) {
*(--q) = fill;
}
}
return q;
}
std::string to_string_dec_uint(
const uint32_t n,
const int32_t l,
const char fill
) {
char p[16];
auto term = p + sizeof(p) - 1;
auto q = to_string_dec_uint_pad_internal(term, n, l, fill);
// Right justify.
while( (term - q) < l ) {
*(--q) = ' ';
}
return q;
}
std::string to_string_dec_int(
const int32_t n,
const int32_t l,
const char fill
) {
const size_t negative = (n < 0) ? 1 : 0;
uint32_t n_abs = negative ? -n : n;
char p[16];
auto term = p + sizeof(p) - 1;
auto q = to_string_dec_uint_pad_internal(term, n_abs, l - negative, fill);
// Add sign.
if( negative ) {
*(--q) = '-';
}
// Right justify.
while( (term - q) < l ) {
*(--q) = ' ';
}
return q;
}
static void to_string_hex_internal(char* p, const uint32_t n, const int32_t l) {
const uint32_t d = n & 0xf;
p[l] = (d > 9) ? (d + 87) : (d + 48);
if( l > 0 ) {
to_string_hex_internal(p, n >> 4, l - 1);
}
}
std::string to_string_hex(const uint32_t n, const int32_t l) {
char p[16];
to_string_hex_internal(p, n, l - 1);
p[l] = 0;
return p;
}