525 lines
13 KiB
C
525 lines
13 KiB
C
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2006-03-16 Bernard the first version
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* 2006-05-25 Bernard rewrite vsprintf
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* 2006-08-10 Bernard add rt_show_version
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* 2010-03-17 Bernard remove rt_strlcpy function
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* fix gcc compiling issue.
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* 2010-04-15 Bernard remove weak definition on ICCM16C compiler
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* 2012-07-18 Arda add the alignment display for signed integer
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* 2012-11-23 Bernard fix IAR compiler error.
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* 2012-12-22 Bernard fix rt_kprintf issue, which found by Grissiom.
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* 2013-06-24 Bernard remove rt_kprintf if RT_USING_CONSOLE is not defined.
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* 2013-09-24 aozima make sure the device is in STREAM mode when used by rt_kprintf.
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* 2015-07-06 Bernard Add rt_assert_handler routine.
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* 2021-02-28 Meco Man add RT_KSERVICE_USING_STDLIB
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*/
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#include "string.h"
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#include "stdint.h"
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#include "stdarg.h"
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/* use precision */
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#define RT_PRINTF_PRECISION
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/* private function */
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#define _ISDIGIT(c) ((unsigned)((c) - '0') < 10)
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#ifdef RT_PRINTF_LONGLONG
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/**
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* This function will duplicate a string.
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*
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* @param n is the string to be duplicated.
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*
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* @param base is support divide instructions value.
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*
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* @return the duplicated string pointer.
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*/
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static inline int divide(long long *n, int base)
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{
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int res;
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/* optimized for processor which does not support divide instructions. */
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if (base == 10) {
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res = (int)(((unsigned long long)*n) % 10U);
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*n = (long long)(((unsigned long long)*n) / 10U);
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} else {
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res = (int)(((unsigned long long)*n) % 16U);
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*n = (long long)(((unsigned long long)*n) / 16U);
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}
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return res;
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}
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#else
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static inline int divide(long *n, int base)
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{
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int res;
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/* optimized for processor which does not support divide instructions. */
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if (base == 10) {
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res = (int)(((unsigned long)*n) % 10U);
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*n = (long)(((unsigned long)*n) / 10U);
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} else {
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res = (int)(((unsigned long)*n) % 16U);
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*n = (long)(((unsigned long)*n) / 16U);
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}
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return res;
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}
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#endif /* RT_PRINTF_LONGLONG */
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static inline int skip_atoi(const char **s)
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{
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register int i = 0;
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while (_ISDIGIT(**s))
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i = i * 10 + *((*s)++) - '0';
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return i;
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}
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#define ZEROPAD (1 << 0) /* pad with zero */
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#define SIGN (1 << 1) /* unsigned/signed long */
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#define PLUS (1 << 2) /* show plus */
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#define SPACE (1 << 3) /* space if plus */
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#define LEFT (1 << 4) /* left justified */
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#define SPECIAL (1 << 5) /* 0x */
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#define LARGE (1 << 6) /* use 'ABCDEF' instead of 'abcdef' */
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#ifdef RT_PRINTF_PRECISION
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static char *print_number(char *buf,
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char *end,
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#ifdef RT_PRINTF_LONGLONG
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long long num,
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#else
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long num,
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#endif /* RT_PRINTF_LONGLONG */
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int base,
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int s,
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int precision,
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int type)
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#else
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static char *print_number(char *buf,
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char *end,
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#ifdef RT_PRINTF_LONGLONG
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long long num,
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#else
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long num,
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#endif /* RT_PRINTF_LONGLONG */
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int base,
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int s,
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int type)
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#endif /* RT_PRINTF_PRECISION */
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{
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char c, sign;
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#ifdef RT_PRINTF_LONGLONG
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char tmp[32];
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#else
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char tmp[16];
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#endif /* RT_PRINTF_LONGLONG */
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int precision_bak = precision;
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const char *digits;
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static const char small_digits[] = "0123456789abcdef";
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static const char large_digits[] = "0123456789ABCDEF";
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register int i;
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register int size;
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size = s;
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digits = (type & LARGE) ? large_digits : small_digits;
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if (type & LEFT)
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type &= ~ZEROPAD;
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c = (type & ZEROPAD) ? '0' : ' ';
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/* get sign */
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sign = 0;
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if (type & SIGN) {
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if (num < 0) {
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sign = '-';
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num = -num;
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} else if (type & PLUS)
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sign = '+';
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else if (type & SPACE)
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sign = ' ';
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}
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#ifdef RT_PRINTF_SPECIAL
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if (type & SPECIAL) {
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if (base == 16)
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size -= 2;
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else if (base == 8)
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size--;
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}
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#endif /* RT_PRINTF_SPECIAL */
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i = 0;
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if (num == 0)
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tmp[i++] = '0';
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else {
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while (num != 0)
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tmp[i++] = digits[divide(&num, base)];
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}
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#ifdef RT_PRINTF_PRECISION
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if (i > precision)
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precision = i;
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size -= precision;
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#else
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size -= i;
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#endif /* RT_PRINTF_PRECISION */
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if (!(type & (ZEROPAD | LEFT))) {
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if ((sign) && (size > 0))
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size--;
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while (size-- > 0) {
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if (buf < end)
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*buf = ' ';
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++buf;
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}
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}
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if (sign) {
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if (buf < end) {
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*buf = sign;
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}
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--size;
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++buf;
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}
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#ifdef RT_PRINTF_SPECIAL
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if (type & SPECIAL) {
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if (base == 8) {
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if (buf < end)
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*buf = '0';
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++buf;
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} else if (base == 16) {
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if (buf < end)
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*buf = '0';
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++buf;
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if (buf < end) {
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*buf = type & LARGE ? 'X' : 'x';
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}
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++buf;
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}
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}
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#endif /* RT_PRINTF_SPECIAL */
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/* no align to the left */
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if (!(type & LEFT)) {
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while (size-- > 0) {
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if (buf < end)
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*buf = c;
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++buf;
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}
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}
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#ifdef RT_PRINTF_PRECISION
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while (i < precision--) {
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if (buf < end)
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*buf = '0';
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++buf;
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}
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#endif /* RT_PRINTF_PRECISION */
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/* put number in the temporary buffer */
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while (i-- > 0 && (precision_bak != 0)) {
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if (buf < end)
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*buf = tmp[i];
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++buf;
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}
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while (size-- > 0) {
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if (buf < end)
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*buf = ' ';
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++buf;
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}
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return buf;
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}
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int vsnprintf (char *, size_t, const char *, va_list) __attribute__ ((alias ("rt_vsnprintf")));
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/**
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* This function will fill a formatted string to buffer.
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*
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* @param buf is the buffer to save formatted string.
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*
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* @param size is the size of buffer.
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*
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* @param fmt is the format parameters.
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*
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* @param args is a list of variable parameters.
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*
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* @return The number of characters actually written to buffer.
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*/
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int32_t rt_vsnprintf(char *buf,
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size_t size,
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const char *fmt,
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va_list args)
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{
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#ifdef RT_PRINTF_LONGLONG
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unsigned long long num;
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#else
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uint32_t num;
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#endif /* RT_PRINTF_LONGLONG */
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int i, len;
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char *str, *end, c;
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const char *s;
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uint8_t base; /* the base of number */
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uint8_t flags; /* flags to print number */
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uint8_t qualifier; /* 'h', 'l', or 'L' for integer fields */
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int32_t field_width; /* width of output field */
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#ifdef RT_PRINTF_PRECISION
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int precision; /* min. # of digits for integers and max for a string */
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#endif /* RT_PRINTF_PRECISION */
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str = buf;
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end = buf + size;
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/* Make sure end is always >= buf */
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if (end < buf) {
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end = ((char *)-1);
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size = end - buf;
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}
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for (; *fmt; ++fmt) {
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if (*fmt != '%') {
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if (str < end)
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*str = *fmt;
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++str;
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continue;
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}
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/* process flags */
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flags = 0;
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while (1) {
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/* skips the first '%' also */
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++fmt;
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if (*fmt == '-')
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flags |= LEFT;
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else if (*fmt == '+')
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flags |= PLUS;
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else if (*fmt == ' ')
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flags |= SPACE;
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else if (*fmt == '#')
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flags |= SPECIAL;
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else if (*fmt == '0')
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flags |= ZEROPAD;
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else
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break;
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}
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/* get field width */
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field_width = -1;
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if (_ISDIGIT(*fmt))
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field_width = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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field_width = va_arg(args, int);
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if (field_width < 0) {
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field_width = -field_width;
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flags |= LEFT;
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}
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}
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#ifdef RT_PRINTF_PRECISION
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/* get the precision */
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precision = -1;
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if (*fmt == '.') {
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++fmt;
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if (_ISDIGIT(*fmt))
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precision = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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precision = va_arg(args, int);
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}
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if (precision < 0)
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precision = 0;
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}
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#endif /* RT_PRINTF_PRECISION */
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/* get the conversion qualifier */
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qualifier = 0;
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#ifdef RT_PRINTF_LONGLONG
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if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L')
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#else
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if (*fmt == 'h' || *fmt == 'l')
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#endif /* RT_PRINTF_LONGLONG */
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{
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qualifier = *fmt;
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++fmt;
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#ifdef RT_PRINTF_LONGLONG
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if (qualifier == 'l' && *fmt == 'l') {
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qualifier = 'L';
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++fmt;
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}
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#endif /* RT_PRINTF_LONGLONG */
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}
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/* the default base */
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base = 10;
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switch (*fmt) {
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case 'c':
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if (!(flags & LEFT)) {
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while (--field_width > 0) {
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if (str < end)
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*str = ' ';
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++str;
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}
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}
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/* get character */
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c = (uint8_t)va_arg(args, int);
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if (str < end)
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*str = c;
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++str;
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/* put width */
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while (--field_width > 0) {
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if (str < end)
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*str = ' ';
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++str;
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}
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continue;
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case 's':
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s = va_arg(args, char *);
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if (!s)
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s = "(NULL)";
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for (len = 0; (len != field_width) && (s[len] != '\0'); len++)
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;
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#ifdef RT_PRINTF_PRECISION
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if (precision > 0 && len > precision)
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len = precision;
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#endif /* RT_PRINTF_PRECISION */
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if (!(flags & LEFT)) {
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||
|
|
while (len < field_width--) {
|
||
|
|
if (str < end)
|
||
|
|
*str = ' ';
|
||
|
|
++str;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
for (i = 0; i < len; ++i) {
|
||
|
|
if (str < end)
|
||
|
|
*str = *s;
|
||
|
|
++str;
|
||
|
|
++s;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (len < field_width--) {
|
||
|
|
if (str < end)
|
||
|
|
*str = ' ';
|
||
|
|
++str;
|
||
|
|
}
|
||
|
|
continue;
|
||
|
|
|
||
|
|
case 'p':
|
||
|
|
if (field_width == -1) {
|
||
|
|
field_width = sizeof(void *) << 1;
|
||
|
|
flags |= ZEROPAD;
|
||
|
|
}
|
||
|
|
#ifdef RT_PRINTF_PRECISION
|
||
|
|
str = print_number(str, end,
|
||
|
|
(long)va_arg(args, void *),
|
||
|
|
16, field_width, precision, flags);
|
||
|
|
#else
|
||
|
|
str = print_number(str, end,
|
||
|
|
(long)va_arg(args, void *),
|
||
|
|
16, field_width, flags);
|
||
|
|
#endif /* RT_PRINTF_PRECISION */
|
||
|
|
continue;
|
||
|
|
|
||
|
|
case '%':
|
||
|
|
if (str < end)
|
||
|
|
*str = '%';
|
||
|
|
++str;
|
||
|
|
continue;
|
||
|
|
|
||
|
|
/* integer number formats - set up the flags and "break" */
|
||
|
|
case 'o':
|
||
|
|
base = 8;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 'X':
|
||
|
|
flags |= LARGE;
|
||
|
|
case 'x':
|
||
|
|
base = 16;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case 'd':
|
||
|
|
case 'i':
|
||
|
|
flags |= SIGN;
|
||
|
|
case 'u':
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
if (str < end)
|
||
|
|
*str = '%';
|
||
|
|
++str;
|
||
|
|
|
||
|
|
if (*fmt) {
|
||
|
|
if (str < end)
|
||
|
|
*str = *fmt;
|
||
|
|
++str;
|
||
|
|
} else {
|
||
|
|
--fmt;
|
||
|
|
}
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef RT_PRINTF_LONGLONG
|
||
|
|
if (qualifier == 'L')
|
||
|
|
num = va_arg(args, long long);
|
||
|
|
else if (qualifier == 'l')
|
||
|
|
#else
|
||
|
|
if (qualifier == 'l')
|
||
|
|
#endif /* RT_PRINTF_LONGLONG */
|
||
|
|
{
|
||
|
|
num = va_arg(args, uint32_t);
|
||
|
|
if (flags & SIGN)
|
||
|
|
num = (int32_t)num;
|
||
|
|
} else if (qualifier == 'h') {
|
||
|
|
num = (uint16_t)va_arg(args, int32_t);
|
||
|
|
if (flags & SIGN)
|
||
|
|
num = (int16_t)num;
|
||
|
|
} else {
|
||
|
|
num = va_arg(args, uint32_t);
|
||
|
|
if (flags & SIGN)
|
||
|
|
num = (int32_t)num;
|
||
|
|
}
|
||
|
|
#ifdef RT_PRINTF_PRECISION
|
||
|
|
str = print_number(str, end, num, base, field_width, precision, flags);
|
||
|
|
#else
|
||
|
|
str = print_number(str, end, num, base, field_width, flags);
|
||
|
|
#endif /* RT_PRINTF_PRECISION */
|
||
|
|
}
|
||
|
|
|
||
|
|
if (size > 0) {
|
||
|
|
if (str < end)
|
||
|
|
*str = '\0';
|
||
|
|
else {
|
||
|
|
end[-1] = '\0';
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* the trailing null byte doesn't count towards the total
|
||
|
|
* ++str;
|
||
|
|
*/
|
||
|
|
return str - buf;
|
||
|
|
}
|
||
|
|
|