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circuitpython/lib/utils/printf.c

138 lines
4.2 KiB

/*
* This file is part of the MicroPython 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.
*/
#include "py/mpconfig.h"
#if MICROPY_USE_INTERNAL_PRINTF
#include <stdint.h>
#include <string.h>
#include <stdarg.h>
#include "py/obj.h"
#include "py/mphal.h"
#if MICROPY_PY_BUILTINS_FLOAT
#include "py/formatfloat.h"
#endif
#undef putchar // Some stdlibs have a #define for putchar
int printf(const char *fmt, ...);
int vprintf(const char *fmt, va_list ap);
int putchar(int c);
int puts(const char *s);
int vsnprintf(char *str, size_t size, const char *fmt, va_list ap);
int snprintf(char *str, size_t size, const char *fmt, ...);
int printf(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
int ret = mp_vprintf(&mp_plat_print, fmt, ap);
va_end(ap);
return ret;
}
int vprintf(const char *fmt, va_list ap) {
return mp_vprintf(&mp_plat_print, fmt, ap);
}
#if MICROPY_DEBUG_PRINTERS
extern const mp_print_t MICROPY_DEBUG_PRINTER_DEST;
int DEBUG_printf(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
#ifndef MICROPY_DEBUG_PRINTER_DEST
#define MICROPY_DEBUG_PRINTER_DEST mp_plat_print
#endif
int ret = mp_vprintf(&MICROPY_DEBUG_PRINTER_DEST, fmt, ap);
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;
mp_hal_stdout_tx_strn_cooked(&chr, 1);
return chr;
}
// need this because gcc optimises printf("string\n") -> puts("string")
int puts(const char *s) {
mp_hal_stdout_tx_strn_cooked(s, strlen(s));
char chr = '\n';
mp_hal_stdout_tx_strn_cooked(&chr, 1);
return 1;
}
typedef struct _strn_print_env_t {
char *cur;
size_t remain;
} strn_print_env_t;
STATIC void strn_print_strn(void *data, const char *str, size_t len) {
strn_print_env_t *strn_print_env = data;
if (len > strn_print_env->remain) {
len = strn_print_env->remain;
}
memcpy(strn_print_env->cur, str, len);
strn_print_env->cur += len;
strn_print_env->remain -= len;
}
#if defined(__GNUC__) && !defined(__clang__) && __GNUC__ < 9
// uClibc requires this alias to be defined, or there may be link errors
// when linkings against it statically.
// GCC 9 gives a warning about missing attributes so it's excluded until
// uClibc+GCC9 support is needed.
int __GI_vsnprintf(char *str, size_t size, const char *fmt, va_list ap) __attribute__((weak, alias ("vsnprintf")));
#endif
int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) {
strn_print_env_t strn_print_env = {str, size};
mp_print_t print = {&strn_print_env, strn_print_strn};
int len = mp_vprintf(&print, fmt, ap);
// add terminating null byte
if (size > 0) {
if (strn_print_env.remain == 0) {
strn_print_env.cur[-1] = 0;
} else {
strn_print_env.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;
}
#endif //MICROPY_USE_INTERNAL_PRINTF