blob: e4342939a9a5f3a88ac63cd7cb41ffd46c8fe262 [file] [log] [blame]
/*
* Copyright (c) 2010, 2013-2014 Wind River Systems, Inc.
* Copyright (c) 2020 Nordic Semiconductor ASA
* Copyright (c) 2021 BayLibre, SAS
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdarg.h>
#include <stdint.h>
#include <string.h>
#include <zephyr/sys/cbprintf.h>
#include <sys/types.h>
#include <zephyr/sys/util.h>
#ifdef CONFIG_CBPRINTF_FULL_INTEGRAL
typedef intmax_t int_value_type;
typedef uintmax_t uint_value_type;
#define DIGITS_BUFLEN 21
BUILD_ASSERT(sizeof(uint_value_type) <= 8U,
"DIGITS_BUFLEN may be incorrect");
#else
typedef int32_t int_value_type;
typedef uint32_t uint_value_type;
#define DIGITS_BUFLEN 10
#endif
#define ALPHA(fmt) (((fmt) & 0x60) - '0' - 10 + 1)
/* Convert value to string, storing characters downwards */
static inline int convert_value(uint_value_type num, unsigned int base,
unsigned int alpha, char *buftop)
{
int i = 0;
do {
unsigned int c = num % base;
if (c >= 10) {
c += alpha;
}
buftop[i--] = c + '0';
num /= base;
} while (num);
return -i;
}
#define OUTC(_c) do { \
out((int)(_c), ctx); \
if (IS_ENABLED(CONFIG_CBPRINTF_LIBC_SUBSTS)) { \
++count; \
} \
} while (false)
#define PAD_ZERO BIT(0)
#define PAD_TAIL BIT(1)
/* Skip over the argument tag if needed as it is not being used here. */
#define SKIP_TAG_IF_NEEDED(ap, tagged_ap) \
do { \
if (IS_ENABLED(CONFIG_CBPRINTF_PACKAGE_SUPPORT_TAGGED_ARGUMENTS) \
&& tagged_ap) { \
(void)va_arg(ap, int); \
} \
} while (0)
/**
* @brief Printk internals
*
* See printk() for description.
* @param fmt Format string
* @param ap Variable parameters
*
* @return printed byte count if CONFIG_CBPRINTF_LIBC_SUBSTS is set
*/
int z_cbvprintf_impl(cbprintf_cb __out, void *ctx, const char *fmt,
va_list ap, uint32_t flags)
{
size_t count = 0;
char buf[DIGITS_BUFLEN];
char *prefix, *data;
int min_width, precision, data_len;
char padding_mode, length_mod, special;
cbprintf_cb_local out = __out;
const bool tagged_ap = (flags & Z_CBVPRINTF_PROCESS_FLAG_TAGGED_ARGS)
== Z_CBVPRINTF_PROCESS_FLAG_TAGGED_ARGS;
/* we pre-increment in the loop afterwards */
fmt--;
start:
while (*++fmt != '%') {
if (*fmt == '\0') {
return count;
}
OUTC(*fmt);
}
min_width = -1;
precision = -1;
prefix = "";
padding_mode = 0;
length_mod = 0;
special = 0;
for (fmt++ ; ; fmt++) {
switch (*fmt) {
case 0:
return count;
case '%':
OUTC('%');
goto start;
case '-':
padding_mode = PAD_TAIL;
continue;
case '.':
precision = 0;
padding_mode &= (char)~PAD_ZERO;
continue;
case '0':
if (min_width < 0 && precision < 0 && !padding_mode) {
padding_mode = PAD_ZERO;
continue;
}
__fallthrough;
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (precision >= 0) {
precision = 10 * precision + *fmt - '0';
} else {
if (min_width < 0) {
min_width = 0;
}
min_width = 10 * min_width + *fmt - '0';
}
continue;
case '*':
SKIP_TAG_IF_NEEDED(ap, tagged_ap);
if (precision >= 0) {
precision = va_arg(ap, int);
} else {
min_width = va_arg(ap, int);
if (min_width < 0) {
min_width = -min_width;
padding_mode = PAD_TAIL;
}
}
continue;
case '+':
case ' ':
case '#':
special = *fmt;
continue;
case 'h':
case 'l':
case 'z':
if (*fmt == 'h' && length_mod == 'h') {
length_mod = 'H';
} else if (*fmt == 'l' && length_mod == 'l') {
length_mod = 'L';
} else if (length_mod == '\0') {
length_mod = *fmt;
} else {
OUTC('%');
OUTC(*fmt);
goto start;
}
continue;
case 'd':
case 'i':
case 'u': {
uint_value_type d;
SKIP_TAG_IF_NEEDED(ap, tagged_ap);
if (length_mod == 'z') {
if (*fmt == 'u') {
d = va_arg(ap, size_t);
} else {
d = va_arg(ap, ssize_t);
}
} else if (length_mod == 'l') {
if (*fmt == 'u') {
d = va_arg(ap, unsigned long);
} else {
d = va_arg(ap, long);
}
} else if (length_mod == 'L') {
if (*fmt == 'u') {
unsigned long long llu =
va_arg(ap, unsigned long long);
if (llu != (uint_value_type) llu) {
data = "ERR";
data_len = 3;
precision = 0;
break;
}
d = (uint_value_type) llu;
} else {
long long lld = va_arg(ap, long long);
if (lld != (int_value_type) lld) {
data = "ERR";
data_len = 3;
precision = 0;
break;
}
d = (int_value_type) lld;
}
} else if (*fmt == 'u') {
d = va_arg(ap, unsigned int);
} else {
d = va_arg(ap, int);
}
if (*fmt != 'u' && (int_value_type)d < 0) {
d = -d;
prefix = "-";
min_width--;
} else if (special == ' ') {
prefix = " ";
min_width--;
} else if (special == '+') {
prefix = "+";
min_width--;
} else {
;
}
data_len = convert_value(d, 10, 0, buf + sizeof(buf) - 1);
data = buf + sizeof(buf) - data_len;
break;
}
case 'p':
case 'x':
case 'X': {
uint_value_type x;
SKIP_TAG_IF_NEEDED(ap, tagged_ap);
if (*fmt == 'p') {
x = (uintptr_t)va_arg(ap, void *);
if (x == (uint_value_type)0) {
data = "(nil)";
data_len = 5;
precision = 0;
break;
}
special = '#';
} else if (length_mod == 'l') {
x = va_arg(ap, unsigned long);
} else if (length_mod == 'L') {
unsigned long long llx =
va_arg(ap, unsigned long long);
if (llx != (uint_value_type) llx) {
data = "ERR";
data_len = 3;
precision = 0;
break;
}
x = (uint_value_type) llx;
} else {
x = va_arg(ap, unsigned int);
}
if (special == '#') {
prefix = (*fmt & 0x20) ? "0x" : "0X";
min_width -= 2;
}
data_len = convert_value(x, 16, ALPHA(*fmt),
buf + sizeof(buf) - 1);
data = buf + sizeof(buf) - data_len;
break;
}
case 's': {
SKIP_TAG_IF_NEEDED(ap, tagged_ap);
data = va_arg(ap, char *);
data_len = strlen(data);
if (precision >= 0 && data_len > precision) {
data_len = precision;
}
precision = 0;
break;
}
case 'c': {
int c;
SKIP_TAG_IF_NEEDED(ap, tagged_ap);
c = va_arg(ap, int);
buf[0] = c;
data = buf;
data_len = 1;
precision = 0;
break;
}
default:
OUTC('%');
OUTC(*fmt);
goto start;
}
if (precision < 0 && (padding_mode & PAD_ZERO)) {
precision = min_width;
}
min_width -= data_len;
precision -= data_len;
if (precision > 0) {
min_width -= precision;
}
if (!(padding_mode & PAD_TAIL)) {
while (--min_width >= 0) {
OUTC(' ');
}
}
while (*prefix) {
OUTC(*prefix++);
}
while (--precision >= 0) {
OUTC('0');
}
while (--data_len >= 0) {
OUTC(*data++);
}
while (--min_width >= 0) {
OUTC(' ');
}
goto start;
}
}