You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
143 lines
2.8 KiB
143 lines
2.8 KiB
/*
|
|
* Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include <stdarg.h>
|
|
|
|
#include <common/debug.h>
|
|
#include <plat/common/platform.h>
|
|
|
|
static void string_print(char **s, size_t n, size_t *chars_printed,
|
|
const char *str)
|
|
{
|
|
while (*str != '\0') {
|
|
if (*chars_printed < n) {
|
|
*(*s) = *str;
|
|
(*s)++;
|
|
}
|
|
|
|
(*chars_printed)++;
|
|
str++;
|
|
}
|
|
}
|
|
|
|
static void unsigned_dec_print(char **s, size_t n, size_t *chars_printed,
|
|
unsigned int unum)
|
|
{
|
|
/* Enough for a 32-bit unsigned decimal integer (4294967295). */
|
|
char num_buf[10];
|
|
int i = 0;
|
|
unsigned int rem;
|
|
|
|
do {
|
|
rem = unum % 10U;
|
|
num_buf[i++] = '0' + rem;
|
|
unum /= 10U;
|
|
} while (unum > 0U);
|
|
|
|
while (--i >= 0) {
|
|
if (*chars_printed < n) {
|
|
*(*s) = num_buf[i];
|
|
(*s)++;
|
|
}
|
|
|
|
(*chars_printed)++;
|
|
}
|
|
}
|
|
|
|
/*******************************************************************
|
|
* Reduced snprintf to be used for Trusted firmware.
|
|
* The following type specifiers are supported:
|
|
*
|
|
* %d or %i - signed decimal format
|
|
* %s - string format
|
|
* %u - unsigned decimal format
|
|
*
|
|
* The function panics on all other formats specifiers.
|
|
*
|
|
* It returns the number of characters that would be written if the
|
|
* buffer was big enough. If it returns a value lower than n, the
|
|
* whole string has been written.
|
|
*******************************************************************/
|
|
int snprintf(char *s, size_t n, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int num;
|
|
unsigned int unum;
|
|
char *str;
|
|
size_t chars_printed = 0U;
|
|
|
|
if (n == 0U) {
|
|
/* There isn't space for anything. */
|
|
} else if (n == 1U) {
|
|
/* Buffer is too small to actually write anything else. */
|
|
*s = '\0';
|
|
n = 0U;
|
|
} else {
|
|
/* Reserve space for the terminator character. */
|
|
n--;
|
|
}
|
|
|
|
va_start(args, fmt);
|
|
while (*fmt != '\0') {
|
|
|
|
if (*fmt == '%') {
|
|
fmt++;
|
|
/* Check the format specifier. */
|
|
switch (*fmt) {
|
|
case 'i':
|
|
case 'd':
|
|
num = va_arg(args, int);
|
|
|
|
if (num < 0) {
|
|
if (chars_printed < n) {
|
|
*s = '-';
|
|
s++;
|
|
}
|
|
chars_printed++;
|
|
|
|
unum = (unsigned int)-num;
|
|
} else {
|
|
unum = (unsigned int)num;
|
|
}
|
|
|
|
unsigned_dec_print(&s, n, &chars_printed, unum);
|
|
break;
|
|
case 's':
|
|
str = va_arg(args, char *);
|
|
string_print(&s, n, &chars_printed, str);
|
|
break;
|
|
case 'u':
|
|
unum = va_arg(args, unsigned int);
|
|
unsigned_dec_print(&s, n, &chars_printed, unum);
|
|
break;
|
|
default:
|
|
/* Panic on any other format specifier. */
|
|
ERROR("snprintf: specifier with ASCII code '%d' not supported.",
|
|
*fmt);
|
|
plat_panic_handler();
|
|
assert(0); /* Unreachable */
|
|
}
|
|
fmt++;
|
|
continue;
|
|
}
|
|
|
|
if (chars_printed < n) {
|
|
*s = *fmt;
|
|
s++;
|
|
}
|
|
|
|
fmt++;
|
|
chars_printed++;
|
|
}
|
|
|
|
va_end(args);
|
|
|
|
if (n > 0U)
|
|
*s = '\0';
|
|
|
|
return (int)chars_printed;
|
|
}
|
|
|