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/*
* Copyright : (C) 2022 Phytium Information Technology, Inc.
* All Rights Reserved.
*
* This program is OPEN SOURCE software: you can redistribute it and/or modify it
* under the terms of the Phytium Public License as published by the Phytium Technology Co.,Ltd,
* either version 1.0 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the Phytium Public License for more details.
*
*
* FilePath: f_printf.c
* Date: 2021-08-23 16:24:02
* LastEditTime: 2022-02-17 18:01:19
* Description: This files is for
*
* Modify History:
* Ver Who Date Changes
* ----- ------ -------- --------------------------------------
*/
#include <stdarg.h>
#include "fearly_uart.h"
#define putchar(c) OutByte(c)
#define PAD_RIGHT 1
#define PAD_ZERO 2
static void printchar(char **str, int c)
{
if (str)
{
**str = c;
++(*str);
}
else
(void)putchar((const char)c);
}
static int prints(char **out, const char *string, int width, int pad)
{
register int pc = 0, padchar = ' ';
if (width > 0)
{
register int len = 0;
register const char *ptr;
for (ptr = string; *ptr; ++ptr)
++len;
if (len >= width)
width = 0;
else
width -= len;
if (pad & PAD_ZERO)
padchar = '0';
}
if (!(pad & PAD_RIGHT))
{
for (; width > 0; --width)
{
printchar(out, padchar);
++pc;
}
}
for (; *string; ++string)
{
printchar(out, *string);
++pc;
}
for (; width > 0; --width)
{
printchar(out, padchar);
++pc;
}
return pc;
}
/* the following should be enough for 32 bit int */
#define PRINT_BUF_LEN 12
static int printi(char **out, int i, int b, int sg, int width, int pad, int letbase)
{
char print_buf[PRINT_BUF_LEN];
register char *s;
register int t, neg = 0, pc = 0;
register unsigned int u = i;
if (i == 0)
{
print_buf[0] = '0';
print_buf[1] = '\0';
return prints(out, print_buf, width, pad);
}
if (sg && b == 10 && i < 0)
{
neg = 1;
u = -i;
}
s = print_buf + PRINT_BUF_LEN - 1;
*s = '\0';
while (u)
{
t = u % b;
if (t >= 10)
t += letbase - '0' - 10;
*--s = t + '0';
u /= b;
}
if (neg)
{
if (width && (pad & PAD_ZERO))
{
printchar(out, '-');
++pc;
--width;
}
else
{
*--s = '-';
}
}
return pc + prints(out, s, width, pad);
}
static int print(char **out, const char *format, va_list args)
{
register int width, pad;
register int pc = 0;
char scr[2];
for (; *format != 0; ++format)
{
if (*format == '%')
{
++format;
width = pad = 0;
if (*format == '\0')
break;
if (*format == '%')
goto out;
if (*format == '-')
{
++format;
pad = PAD_RIGHT;
}
while (*format == '0')
{
++format;
pad |= PAD_ZERO;
}
for (; *format >= '0' && *format <= '9'; ++format)
{
width *= 10;
width += *format - '0';
}
if (*format == 's')
{
//register char *s = (char *)va_arg( args, int );
register char *s = (char *)va_arg(args, char *);
pc += prints(out, s ? s : "(null)", width, pad);
continue;
}
if (*format == 'd')
{
pc += printi(out, va_arg(args, int), 10, 1, width, pad, 'a');
continue;
}
if (*format == 'x')
{
pc += printi(out, va_arg(args, int), 16, 0, width, pad, 'a');
continue;
}
if (*format == 'X')
{
pc += printi(out, va_arg(args, int), 16, 0, width, pad, 'A');
continue;
}
if (*format == 'u')
{
pc += printi(out, va_arg(args, int), 10, 0, width, pad, 'a');
continue;
}
if (*format == 'c')
{
/* char are converted to int then pushed on the stack */
scr[0] = (char)va_arg(args, int);
scr[1] = '\0';
pc += prints(out, scr, width, pad);
continue;
}
}
else
{
out:
printchar(out, *format);
++pc;
}
}
if (out)
**out = '\0';
va_end(args);
return pc;
}
int f_printf(const char *format, ...)
{
va_list args;
va_start(args, format);
return print(0, format, args);
}
#ifdef TEST_PRINTF
int test_printf(void)
{
char *ptr = "Hello world!";
char *np = 0;
int i = 5;
unsigned int bs = sizeof(int) * 8;
int mi;
char buf[80];
mi = (1 << (bs - 1)) + 1;
f_printf("%s\n", ptr);
f_printf("printf test\n");
f_printf("%s is null pointer\n", np);
f_printf("%d = 5\n", i);
f_printf("%d = - max int\n", mi);
f_printf("char %c = 'a'\n", 'a');
f_printf("hex %x = ff\n", 0xff);
f_printf("hex %02x = 00\n", 0);
f_printf("signed %d = unsigned %u = hex %x\n", -3, -3, -3);
f_printf("%d %s(s)%", 0, "message");
f_printf("\n");
f_printf("%d %s(s) with %%\n", 0, "message");
sprintf(buf, "justif: \"%-10s\"\n", "left");
f_printf("%s", buf);
sprintf(buf, "justif: \"%10s\"\n", "right");
f_printf("%s", buf);
sprintf(buf, " 3: %04d zero padded\n", 3);
f_printf("%s", buf);
sprintf(buf, " 3: %-4d left justif.\n", 3);
f_printf("%s", buf);
sprintf(buf, " 3: %4d right justif.\n", 3);
f_printf("%s", buf);
sprintf(buf, "-3: %04d zero padded\n", -3);
f_printf("%s", buf);
sprintf(buf, "-3: %-4d left justif.\n", -3);
f_printf("%s", buf);
sprintf(buf, "-3: %4d right justif.\n", -3);
f_printf("%s", buf);
return 0;
}
#endif
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