u-boot/lib/tiny-printf.c
Simon Glass 5ed16a9511 net: Rename SPL_NET_SUPPORT to SPL_NET
Rename this option so that CONFIG_IS_ENABLED can be used with it.

Signed-off-by: Simon Glass <sjg@chromium.org>
2021-09-04 12:48:53 -04:00

419 lines
7.8 KiB
C

// SPDX-License-Identifier: LGPL-2.1+
/*
* Tiny printf version for SPL
*
* Copied from:
* http://www.sparetimelabs.com/printfrevisited/printfrevisited.php
*
* Copyright (C) 2004,2008 Kustaa Nyholm
*/
#include <common.h>
#include <log.h>
#include <serial.h>
#include <stdarg.h>
#include <linux/ctype.h>
struct printf_info {
char *bf; /* Digit buffer */
char zs; /* non-zero if a digit has been written */
char *outstr; /* Next output position for sprintf() */
/* Output a character */
void (*putc)(struct printf_info *info, char ch);
};
static void out(struct printf_info *info, char c)
{
*info->bf++ = c;
}
static void out_dgt(struct printf_info *info, char dgt)
{
out(info, dgt + (dgt < 10 ? '0' : 'a' - 10));
info->zs = 1;
}
static void div_out(struct printf_info *info, unsigned long *num,
unsigned long div)
{
unsigned char dgt = 0;
while (*num >= div) {
*num -= div;
dgt++;
}
if (info->zs || dgt > 0)
out_dgt(info, dgt);
}
#ifdef CONFIG_SPL_NET
static void string(struct printf_info *info, char *s)
{
char ch;
while ((ch = *s++))
out(info, ch);
}
static const char hex_asc[] = "0123456789abcdef";
#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
static inline char *pack_hex_byte(char *buf, u8 byte)
{
*buf++ = hex_asc_hi(byte);
*buf++ = hex_asc_lo(byte);
return buf;
}
static void mac_address_string(struct printf_info *info, u8 *addr,
bool separator)
{
/* (6 * 2 hex digits), 5 colons and trailing zero */
char mac_addr[6 * 3];
char *p = mac_addr;
int i;
for (i = 0; i < 6; i++) {
p = pack_hex_byte(p, addr[i]);
if (separator && i != 5)
*p++ = ':';
}
*p = '\0';
string(info, mac_addr);
}
static char *put_dec_trunc(char *buf, unsigned int q)
{
unsigned int d3, d2, d1, d0;
d1 = (q >> 4) & 0xf;
d2 = (q >> 8) & 0xf;
d3 = (q >> 12);
d0 = 6 * (d3 + d2 + d1) + (q & 0xf);
q = (d0 * 0xcd) >> 11;
d0 = d0 - 10 * q;
*buf++ = d0 + '0'; /* least significant digit */
d1 = q + 9 * d3 + 5 * d2 + d1;
if (d1 != 0) {
q = (d1 * 0xcd) >> 11;
d1 = d1 - 10 * q;
*buf++ = d1 + '0'; /* next digit */
d2 = q + 2 * d2;
if ((d2 != 0) || (d3 != 0)) {
q = (d2 * 0xd) >> 7;
d2 = d2 - 10 * q;
*buf++ = d2 + '0'; /* next digit */
d3 = q + 4 * d3;
if (d3 != 0) {
q = (d3 * 0xcd) >> 11;
d3 = d3 - 10 * q;
*buf++ = d3 + '0'; /* next digit */
if (q != 0)
*buf++ = q + '0'; /* most sign. digit */
}
}
}
return buf;
}
static void ip4_addr_string(struct printf_info *info, u8 *addr)
{
/* (4 * 3 decimal digits), 3 dots and trailing zero */
char ip4_addr[4 * 4];
char temp[3]; /* hold each IP quad in reverse order */
char *p = ip4_addr;
int i, digits;
for (i = 0; i < 4; i++) {
digits = put_dec_trunc(temp, addr[i]) - temp;
/* reverse the digits in the quad */
while (digits--)
*p++ = temp[digits];
if (i != 3)
*p++ = '.';
}
*p = '\0';
string(info, ip4_addr);
}
#endif
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of characters that are extended format
* specifiers.
*
* Right now we handle:
*
* - 'M' For a 6-byte MAC address, it prints the address in the
* usual colon-separated hex notation.
* - 'm' Same as above except there is no colon-separator.
* - 'I4'for IPv4 addresses printed in the usual way (dot-separated
* decimal).
*/
static void __maybe_unused pointer(struct printf_info *info, const char *fmt,
void *ptr)
{
#ifdef DEBUG
unsigned long num = (uintptr_t)ptr;
unsigned long div;
#endif
switch (*fmt) {
#ifdef DEBUG
case 'a':
switch (fmt[1]) {
case 'p':
default:
num = *(phys_addr_t *)ptr;
break;
}
break;
#endif
#ifdef CONFIG_SPL_NET
case 'm':
return mac_address_string(info, ptr, false);
case 'M':
return mac_address_string(info, ptr, true);
case 'I':
if (fmt[1] == '4')
return ip4_addr_string(info, ptr);
#endif
default:
break;
}
#ifdef DEBUG
div = 1UL << (sizeof(long) * 8 - 4);
for (; div; div /= 0x10)
div_out(info, &num, div);
#endif
}
static int _vprintf(struct printf_info *info, const char *fmt, va_list va)
{
char ch;
char *p;
unsigned long num;
char buf[12];
unsigned long div;
while ((ch = *(fmt++))) {
if (ch != '%') {
info->putc(info, ch);
} else {
bool lz = false;
int width = 0;
bool islong = false;
ch = *(fmt++);
if (ch == '-')
ch = *(fmt++);
if (ch == '0') {
ch = *(fmt++);
lz = 1;
}
if (ch >= '0' && ch <= '9') {
width = 0;
while (ch >= '0' && ch <= '9') {
width = (width * 10) + ch - '0';
ch = *fmt++;
}
}
if (ch == 'l') {
ch = *(fmt++);
islong = true;
}
info->bf = buf;
p = info->bf;
info->zs = 0;
switch (ch) {
case '\0':
goto abort;
case 'u':
case 'd':
case 'i':
div = 1000000000;
if (islong) {
num = va_arg(va, unsigned long);
if (sizeof(long) > 4)
div *= div * 10;
} else {
num = va_arg(va, unsigned int);
}
if (ch != 'u') {
if (islong && (long)num < 0) {
num = -(long)num;
out(info, '-');
} else if (!islong && (int)num < 0) {
num = -(int)num;
out(info, '-');
}
}
if (!num) {
out_dgt(info, 0);
} else {
for (; div; div /= 10)
div_out(info, &num, div);
}
break;
case 'p':
if (CONFIG_IS_ENABLED(NET) || _DEBUG) {
pointer(info, fmt, va_arg(va, void *));
/*
* Skip this because it pulls in _ctype which is
* 256 bytes, and we don't generally implement
* pointer anyway
*/
while (isalnum(fmt[0]))
fmt++;
break;
}
islong = true;
/* no break */
case 'x':
if (islong) {
num = va_arg(va, unsigned long);
div = 1UL << (sizeof(long) * 8 - 4);
} else {
num = va_arg(va, unsigned int);
div = 0x10000000;
}
if (!num) {
out_dgt(info, 0);
} else {
for (; div; div /= 0x10)
div_out(info, &num, div);
}
break;
case 'c':
out(info, (char)(va_arg(va, int)));
break;
case 's':
p = va_arg(va, char*);
break;
case '%':
out(info, '%');
default:
break;
}
*info->bf = 0;
info->bf = p;
while (*info->bf++ && width > 0)
width--;
while (width-- > 0)
info->putc(info, lz ? '0' : ' ');
if (p) {
while ((ch = *p++))
info->putc(info, ch);
}
}
}
abort:
return 0;
}
#if CONFIG_IS_ENABLED(PRINTF)
static void putc_normal(struct printf_info *info, char ch)
{
putc(ch);
}
int vprintf(const char *fmt, va_list va)
{
struct printf_info info;
info.putc = putc_normal;
return _vprintf(&info, fmt, va);
}
int printf(const char *fmt, ...)
{
struct printf_info info;
va_list va;
int ret;
info.putc = putc_normal;
va_start(va, fmt);
ret = _vprintf(&info, fmt, va);
va_end(va);
return ret;
}
#endif
static void putc_outstr(struct printf_info *info, char ch)
{
*info->outstr++ = ch;
}
int sprintf(char *buf, const char *fmt, ...)
{
struct printf_info info;
va_list va;
int ret;
va_start(va, fmt);
info.outstr = buf;
info.putc = putc_outstr;
ret = _vprintf(&info, fmt, va);
va_end(va);
*info.outstr = '\0';
return ret;
}
#if CONFIG_IS_ENABLED(LOG)
/* Note that size is ignored */
int vsnprintf(char *buf, size_t size, const char *fmt, va_list va)
{
struct printf_info info;
int ret;
info.outstr = buf;
info.putc = putc_outstr;
ret = _vprintf(&info, fmt, va);
*info.outstr = '\0';
return ret;
}
#endif
/* Note that size is ignored */
int snprintf(char *buf, size_t size, const char *fmt, ...)
{
struct printf_info info;
va_list va;
int ret;
va_start(va, fmt);
info.outstr = buf;
info.putc = putc_outstr;
ret = _vprintf(&info, fmt, va);
va_end(va);
*info.outstr = '\0';
return ret;
}
void print_grouped_ull(unsigned long long int_val, int digits)
{
/* Don't try to print the upper 32-bits */
printf("%ld ", (ulong)int_val);
}