circuitpython/stmhal/printf.c

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/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
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#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include "mpconfig.h"
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#include "std.h"
#include "misc.h"
#include "systick.h"
#include "qstr.h"
#include "obj.h"
#include "pfenv.h"
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#if 0
#include "lcd.h"
#endif
#include "uart.h"
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#include "usb.h"
#if MICROPY_PY_BUILTINS_FLOAT
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#include "formatfloat.h"
#endif
int pfenv_vprintf(const pfenv_t *pfenv, const char *fmt, va_list args);
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void pfenv_prints(const pfenv_t *pfenv, const char *str) {
pfenv->print_strn(pfenv->data, str, strlen(str));
}
STATIC void stdout_print_strn(void *data, const char *str, unsigned int len) {
// TODO this needs to be replaced with a proper stdio interface ala CPython
// send stdout to UART and USB CDC VCP
if (pyb_uart_global_debug != PYB_UART_NONE) {
uart_tx_strn_cooked(pyb_uart_global_debug, str, len);
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}
if (usb_vcp_is_enabled()) {
usb_vcp_send_strn_cooked(str, len);
}
}
static const pfenv_t pfenv_stdout = {0, stdout_print_strn};
int printf(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
int ret = pfenv_vprintf(&pfenv_stdout, fmt, ap);
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va_end(ap);
return ret;
}
int vprintf(const char *fmt, va_list ap) {
return pfenv_vprintf(&pfenv_stdout, fmt, ap);
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}
#if MICROPY_DEBUG_PRINTERS
int DEBUG_printf(const char *fmt, ...) {
(void)stream;
va_list ap;
va_start(ap, fmt);
int ret = pfenv_vprintf(&pfenv_stdout, fmt, ap);
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va_end(ap);
return ret;
}
#endif
// need this because gcc optimises printf("%c", c) -> putchar(c), and printf("a") -> putchar('a')
int putchar(int c) {
char chr = c;
stdout_print_strn(0, &chr, 1);
return chr;
}
// need this because gcc optimises printf("string\n") -> puts("string")
int puts(const char *s) {
stdout_print_strn(0, s, strlen(s));
char chr = '\n';
stdout_print_strn(0, &chr, 1);
return 1;
}
typedef struct _strn_pfenv_t {
char *cur;
size_t remain;
} strn_pfenv_t;
void strn_print_strn(void *data, const char *str, unsigned int len) {
strn_pfenv_t *strn_pfenv = data;
if (len > strn_pfenv->remain) {
len = strn_pfenv->remain;
}
memcpy(strn_pfenv->cur, str, len);
strn_pfenv->cur += len;
strn_pfenv->remain -= len;
}
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int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) {
strn_pfenv_t strn_pfenv;
strn_pfenv.cur = str;
strn_pfenv.remain = size;
pfenv_t pfenv;
pfenv.data = &strn_pfenv;
pfenv.print_strn = strn_print_strn;
int len = pfenv_vprintf(&pfenv, fmt, ap);
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// add terminating null byte
if (size > 0) {
if (strn_pfenv.remain == 0) {
strn_pfenv.cur[-1] = 0;
} else {
strn_pfenv.cur[0] = 0;
}
}
return len;
}
int snprintf(char *str, size_t size, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
int ret = vsnprintf(str, size, fmt, ap);
va_end(ap);
return ret;
}