419 lines
10 KiB
C
419 lines
10 KiB
C
/*
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* Copyright : (C) 2022 Phytium Information Technology, Inc.
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* All Rights Reserved.
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*
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* This program is OPEN SOURCE software: you can redistribute it and/or modify it
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* under the terms of the Phytium Public License as published by the Phytium Technology Co.,Ltd,
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* either version 1.0 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the Phytium Public License for more details.
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*
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*
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* FilePath: fprintk.c
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* Date: 2022-02-10 14:53:42
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* LastEditTime: 2022-02-17 18:01:29
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* Description: This file is for creating custom print interface for standlone sdk.
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*
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* Modify History:
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* Ver Who Date Changes
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* ----- ------ -------- --------------------------------------
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* 1.0 huanghe 2022/7/23 first release
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*/
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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#include "fkernel.h"
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#include "ftypes.h"
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#include "fearly_uart.h"
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#ifndef __fallthrough
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#if __GNUC__ >= 7
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#define __fallthrough __attribute__((fallthrough))
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#else
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#define __fallthrough
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#endif /* __GNUC__ >= 7 */
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#endif
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typedef int (*cbprintf_cb)(int c, void *ctx);
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#define CONFIG_CBPRINTF_FULL_INTEGRAL
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#ifdef CONFIG_CBPRINTF_FULL_INTEGRAL
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typedef intmax_t int_value_type;
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typedef uintmax_t uint_value_type;
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#define DIGITS_BUFLEN 21
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#else
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typedef s32 int_value_type;
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typedef u32 uint_value_type;
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#define DIGITS_BUFLEN 10
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#endif
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#define ALPHA(fmt) (((fmt)&0x60) - '0' - 10 + 1)
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struct str_context
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{
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char *str;
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int max;
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int count;
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};
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static int char_out(int c, void *ctx_p)
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{
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struct str_context *ctx = ctx_p;
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ctx->count++;
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OutByte((s8)c);
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return 1;
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}
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/* Convert value to string, storing characters downwards */
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static inline int convert_value(uint_value_type num, unsigned int base,
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unsigned int alpha, char *buftop)
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{
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int i = 0;
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do
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{
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unsigned int c = num % base;
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if (c >= 10)
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{
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c += alpha;
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}
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buftop[--i] = c + '0';
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num /= base;
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}
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while (num);
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return -i;
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}
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#define OUTC(_c) \
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do \
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{ \
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out((int)(_c), ctx); \
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count++; \
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} while (0)
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#define PAD_ZERO BIT(0)
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#define PAD_TAIL BIT(1)
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/**
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* @brief Printk internals
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*
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* See printk() for description.
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* @param fmt Format string
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* @param ap Variable parameters
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*
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* @return printed byte count if CONFIG_CBPRINTF_LIBC_SUBSTS is set
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*/
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int cbvprintf(cbprintf_cb out, void *ctx, const char *fmt, va_list ap)
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{
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size_t count = 0;
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char buf[DIGITS_BUFLEN];
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char *prefix, *data;
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int min_width, precision, data_len;
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char padding_mode, length_mod, special;
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/* we pre-increment in the loop afterwards */
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fmt--;
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start:
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while (*++fmt != '%')
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{
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if (*fmt == '\0')
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{
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return count;
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}
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OUTC(*fmt);
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}
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min_width = -1;
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precision = -1;
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prefix = "";
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padding_mode = 0;
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length_mod = 0;
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special = 0;
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for (fmt++;; fmt++)
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{
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switch (*fmt)
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{
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case 0:
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return count;
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case '%':
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OUTC('%');
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goto start;
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case '-':
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padding_mode = PAD_TAIL;
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continue;
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case '.':
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precision = 0;
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padding_mode &= (char)~PAD_ZERO;
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continue;
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case '0':
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if (min_width < 0 && precision < 0 && !padding_mode)
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{
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padding_mode = PAD_ZERO;
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continue;
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}
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__fallthrough;
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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if (precision >= 0)
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{
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precision = 10 * precision + *fmt - '0';
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}
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else
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{
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if (min_width < 0)
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{
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min_width = 0;
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}
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min_width = 10 * min_width + *fmt - '0';
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}
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continue;
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case '*':
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if (precision >= 0)
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{
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precision = va_arg(ap, int);
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}
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else
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{
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min_width = va_arg(ap, int);
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if (min_width < 0)
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{
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min_width = -min_width;
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padding_mode = PAD_TAIL;
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}
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}
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continue;
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case '+':
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case ' ':
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case '#':
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special = *fmt;
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continue;
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case 'h':
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case 'l':
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case 'z':
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if (*fmt == 'h' && length_mod == 'h')
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{
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length_mod = 'H';
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}
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else if (*fmt == 'l' && length_mod == 'l')
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{
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length_mod = 'L';
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}
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else if (length_mod == '\0')
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{
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length_mod = *fmt;
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}
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else
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{
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OUTC('%');
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OUTC(*fmt);
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goto start;
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}
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continue;
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case 'd':
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case 'i':
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case 'u':
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{
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uint_value_type d;
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if (length_mod == 'z')
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{
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d = va_arg(ap, ssize_t);
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}
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else if (length_mod == 'l')
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{
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d = va_arg(ap, long);
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}
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else if (length_mod == 'L')
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{
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long long lld = va_arg(ap, long long);
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if (sizeof(int_value_type) < 8U &&
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lld != (int_value_type)lld)
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{
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data = "ERR";
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data_len = 3;
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precision = 0;
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break;
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}
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d = (uint_value_type)lld;
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}
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else if (*fmt == 'u')
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{
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d = va_arg(ap, unsigned int);
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}
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else
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{
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d = va_arg(ap, int);
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}
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if (*fmt != 'u' && (int_value_type)d < 0)
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{
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d = -d;
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prefix = "-";
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min_width--;
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}
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else if (special == ' ')
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{
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prefix = " ";
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min_width--;
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}
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else if (special == '+')
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{
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prefix = "+";
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min_width--;
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}
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else
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{
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;
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}
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data_len = convert_value(d, 10, 0, buf + sizeof(buf));
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data = buf + sizeof(buf) - data_len;
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break;
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}
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case 'p':
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case 'x':
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case 'X':
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{
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uint_value_type x;
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if (*fmt == 'p')
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{
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x = (uintptr_t)va_arg(ap, void *);
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if (x == (uint_value_type)0)
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{
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data = "(nil)";
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data_len = 5;
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precision = 0;
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break;
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}
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special = '#';
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}
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else if (length_mod == 'l')
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{
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x = va_arg(ap, unsigned long);
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}
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else if (length_mod == 'L')
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{
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x = va_arg(ap, unsigned long long);
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}
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else
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{
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x = va_arg(ap, unsigned int);
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}
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if (special == '#')
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{
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prefix = (*fmt & 0x20) ? "0x" : "0x";
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min_width -= 2;
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}
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data_len = convert_value(x, 16, ALPHA(*fmt),
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buf + sizeof(buf));
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data = buf + sizeof(buf) - data_len;
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break;
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}
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case 's':
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{
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data = va_arg(ap, char *);
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data_len = strlen(data);
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if (precision >= 0 && data_len > precision)
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{
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data_len = precision;
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}
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precision = 0;
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break;
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}
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case 'c':
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{
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int c = va_arg(ap, int);
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buf[0] = c;
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data = buf;
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data_len = 1;
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precision = 0;
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break;
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}
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default:
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OUTC('%');
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OUTC(*fmt);
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goto start;
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}
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if (precision < 0 && (padding_mode & PAD_ZERO))
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{
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precision = min_width;
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}
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min_width -= data_len;
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precision -= data_len;
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if (precision > 0)
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{
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min_width -= precision;
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}
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if (!(padding_mode & PAD_TAIL))
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{
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while (--min_width >= 0)
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{
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OUTC(' ');
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}
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}
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while (*prefix)
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{
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OUTC(*prefix++);
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}
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while (--precision >= 0)
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{
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OUTC('0');
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}
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while (--data_len >= 0)
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{
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OUTC(*data++);
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}
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while (--min_width >= 0)
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{
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OUTC(' ');
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}
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goto start;
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}
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}
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static void f_vprintf(const char *restrict format, va_list vargs)
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{
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struct str_context ctx = {0};
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cbvprintf(char_out, &ctx, format, vargs);
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}
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void f_printk(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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f_vprintf(fmt, ap);
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va_end(ap);
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} |