HackRF-Treasure-Chest/Software/portapack-mayhem/firmware/chibios/os/various/chprintf.c

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2022-09-22 18:26:57 +02:00
/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
Concepts and parts of this file have been contributed by Fabio Utzig,
chvprintf() added by Brent Roman.
*/
/**
* @file chprintf.c
* @brief Mini printf-like functionality.
*
* @addtogroup chprintf
* @{
*/
#include "ch.h"
#include "chprintf.h"
#include "memstreams.h"
#define MAX_FILLER 11
#define FLOAT_PRECISION 100000
static char *long_to_string_with_divisor(char *p,
long num,
unsigned radix,
long divisor) {
int i;
char *q;
long l, ll;
l = num;
if (divisor == 0) {
ll = num;
} else {
ll = divisor;
}
q = p + MAX_FILLER;
do {
i = (int)(l % radix);
i += '0';
if (i > '9')
i += 'A' - '0' - 10;
*--q = i;
l /= radix;
} while ((ll /= radix) != 0);
i = (int)(p + MAX_FILLER - q);
do
*p++ = *q++;
while (--i);
return p;
}
static char *ltoa(char *p, long num, unsigned radix) {
return long_to_string_with_divisor(p, num, radix, 0);
}
#if CHPRINTF_USE_FLOAT
static char *ftoa(char *p, double num) {
long l;
unsigned long precision = FLOAT_PRECISION;
l = (long)num;
p = long_to_string_with_divisor(p, l, 10, 0);
*p++ = '.';
l = (long)((num - l) * precision);
return long_to_string_with_divisor(p, l, 10, precision / 10);
}
#endif
/**
* @brief System formatted output function.
* @details This function implements a minimal @p vprintf()-like functionality
* with output on a @p BaseSequentialStream.
* The general parameters format is: %[-][width|*][.precision|*][l|L]p.
* The following parameter types (p) are supported:
* - <b>x</b> hexadecimal integer.
* - <b>X</b> hexadecimal long.
* - <b>o</b> octal integer.
* - <b>O</b> octal long.
* - <b>d</b> decimal signed integer.
* - <b>D</b> decimal signed long.
* - <b>u</b> decimal unsigned integer.
* - <b>U</b> decimal unsigned long.
* - <b>c</b> character.
* - <b>s</b> string.
* .
*
* @param[in] chp pointer to a @p BaseSequentialStream implementing object
* @param[in] fmt formatting string
* @param[in] ap list of parameters
*
* @api
*/
void chvprintf(BaseSequentialStream *chp, const char *fmt, va_list ap) {
char *p, *s, c, filler;
int i, precision, width;
bool_t is_long, left_align;
long l;
#if CHPRINTF_USE_FLOAT
float f;
char tmpbuf[2*MAX_FILLER + 1];
#else
char tmpbuf[MAX_FILLER + 1];
#endif
while (TRUE) {
c = *fmt++;
if (c == 0)
return;
if (c != '%') {
chSequentialStreamPut(chp, (uint8_t)c);
continue;
}
p = tmpbuf;
s = tmpbuf;
left_align = FALSE;
if (*fmt == '-') {
fmt++;
left_align = TRUE;
}
filler = ' ';
if ((*fmt == '.') || (*fmt == '0')) {
fmt++;
filler = '0';
}
width = 0;
while (TRUE) {
c = *fmt++;
if (c >= '0' && c <= '9')
c -= '0';
else if (c == '*')
c = va_arg(ap, int);
else
break;
width = width * 10 + c;
}
precision = 0;
if (c == '.') {
while (TRUE) {
c = *fmt++;
if (c >= '0' && c <= '9')
c -= '0';
else if (c == '*')
c = va_arg(ap, int);
else
break;
precision *= 10;
precision += c;
}
}
/* Long modifier.*/
if (c == 'l' || c == 'L') {
is_long = TRUE;
if (*fmt)
c = *fmt++;
}
else
is_long = (c >= 'A') && (c <= 'Z');
/* Command decoding.*/
switch (c) {
case 'c':
filler = ' ';
*p++ = va_arg(ap, int);
break;
case 's':
filler = ' ';
if ((s = va_arg(ap, char *)) == 0)
s = "(null)";
if (precision == 0)
precision = 32767;
for (p = s; *p && (--precision >= 0); p++)
;
break;
case 'D':
case 'd':
case 'I':
case 'i':
if (is_long)
l = va_arg(ap, long);
else
l = va_arg(ap, int);
if (l < 0) {
*p++ = '-';
l = -l;
}
p = ltoa(p, l, 10);
break;
#if CHPRINTF_USE_FLOAT
case 'f':
f = (float) va_arg(ap, double);
if (f < 0) {
*p++ = '-';
f = -f;
}
p = ftoa(p, f);
break;
#endif
case 'X':
case 'x':
c = 16;
goto unsigned_common;
case 'U':
case 'u':
c = 10;
goto unsigned_common;
case 'O':
case 'o':
c = 8;
unsigned_common:
if (is_long)
l = va_arg(ap, unsigned long);
else
l = va_arg(ap, unsigned int);
p = ltoa(p, l, c);
break;
default:
*p++ = c;
break;
}
i = (int)(p - s);
if ((width -= i) < 0)
width = 0;
if (left_align == FALSE)
width = -width;
if (width < 0) {
if (*s == '-' && filler == '0') {
chSequentialStreamPut(chp, (uint8_t)*s++);
i--;
}
do {
chSequentialStreamPut(chp, (uint8_t)filler);
} while (++width != 0);
}
while (--i >= 0)
chSequentialStreamPut(chp, (uint8_t)*s++);
while (width) {
chSequentialStreamPut(chp, (uint8_t)filler);
width--;
}
}
}
/**
* @brief System formatted output function.
* @details This function implements a minimal @p vprintf()-like functionality
* with output on a @p BaseSequentialStream.
* The general parameters format is: %[-][width|*][.precision|*][l|L]p.
* The following parameter types (p) are supported:
* - <b>x</b> hexadecimal integer.
* - <b>X</b> hexadecimal long.
* - <b>o</b> octal integer.
* - <b>O</b> octal long.
* - <b>d</b> decimal signed integer.
* - <b>D</b> decimal signed long.
* - <b>u</b> decimal unsigned integer.
* - <b>U</b> decimal unsigned long.
* - <b>c</b> character.
* - <b>s</b> string.
* .
*
* @param[in] str pointer to a buffer
* @param[in] size maximum size of the buffer
* @param[in] fmt formatting string
* @return The size of the generated string.
*
* @api
*/
int chsnprintf(char *str, size_t size, const char *fmt, ...) {
va_list ap;
MemoryStream ms;
BaseSequentialStream *chp;
/* Memory stream object to be used as a string writer, reserving one
byte for the final zero.*/
msObjectInit(&ms, (uint8_t *)str, size - 1, 0);
/* Performing the print operation using the common code.*/
chp = (BaseSequentialStream *)&ms;
va_start(ap, fmt);
chvprintf(chp, fmt, ap);
va_end(ap);
/* Final zero and size return.*/
str[ms.eos] = 0;
return ms.eos;
}
/** @} */