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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:13:47 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 09:13:47 +0000
commit102b0d2daa97dae68d3eed54d8fe37a9cc38a892 (patch)
treebcf648efac40ca6139842707f0eba5a4496a6dd2 /lib/libc/printf.c
parentInitial commit. (diff)
downloadarm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.tar.xz
arm-trusted-firmware-102b0d2daa97dae68d3eed54d8fe37a9cc38a892.zip
Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/libc/printf.c')
-rw-r--r--lib/libc/printf.c206
1 files changed, 206 insertions, 0 deletions
diff --git a/lib/libc/printf.c b/lib/libc/printf.c
new file mode 100644
index 0000000..e52cbed
--- /dev/null
+++ b/lib/libc/printf.c
@@ -0,0 +1,206 @@
+/*
+ * Copyright (c) 2014-2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#define get_num_va_args(_args, _lcount) \
+ (((_lcount) > 1) ? va_arg(_args, long long int) : \
+ (((_lcount) == 1) ? va_arg(_args, long int) : \
+ va_arg(_args, int)))
+
+#define get_unum_va_args(_args, _lcount) \
+ (((_lcount) > 1) ? va_arg(_args, unsigned long long int) : \
+ (((_lcount) == 1) ? va_arg(_args, unsigned long int) : \
+ va_arg(_args, unsigned int)))
+
+static int string_print(const char *str)
+{
+ int count = 0;
+
+ assert(str != NULL);
+
+ for ( ; *str != '\0'; str++) {
+ (void)putchar(*str);
+ count++;
+ }
+
+ return count;
+}
+
+static int unsigned_num_print(unsigned long long int unum, unsigned int radix,
+ char padc, int padn)
+{
+ /* Just need enough space to store 64 bit decimal integer */
+ char num_buf[20];
+ int i = 0, count = 0;
+ unsigned int rem;
+
+ /* num_buf is only large enough for radix >= 10 */
+ if (radix < 10) {
+ assert(0);
+ return 0;
+ }
+
+ do {
+ rem = unum % radix;
+ if (rem < 0xa)
+ num_buf[i] = '0' + rem;
+ else
+ num_buf[i] = 'a' + (rem - 0xa);
+ i++;
+ unum /= radix;
+ } while (unum > 0U);
+
+ if (padn > 0) {
+ while (i < padn) {
+ (void)putchar(padc);
+ count++;
+ padn--;
+ }
+ }
+
+ while (--i >= 0) {
+ (void)putchar(num_buf[i]);
+ count++;
+ }
+
+ return count;
+}
+
+/*******************************************************************
+ * Reduced format print for Trusted firmware.
+ * The following type specifiers are supported by this print
+ * %x - hexadecimal format
+ * %s - string format
+ * %d or %i - signed decimal format
+ * %u - unsigned decimal format
+ * %p - pointer format
+ *
+ * The following length specifiers are supported by this print
+ * %l - long int (64-bit on AArch64)
+ * %ll - long long int (64-bit on AArch64)
+ * %z - size_t sized integer formats (64 bit on AArch64)
+ *
+ * The following padding specifiers are supported by this print
+ * %0NN - Left-pad the number with 0s (NN is a decimal number)
+ *
+ * The print exits on all other formats specifiers other than valid
+ * combinations of the above specifiers.
+ *******************************************************************/
+int vprintf(const char *fmt, va_list args)
+{
+ int l_count;
+ long long int num;
+ unsigned long long int unum;
+ char *str;
+ char padc = '\0'; /* Padding character */
+ int padn; /* Number of characters to pad */
+ int count = 0; /* Number of printed characters */
+
+ while (*fmt != '\0') {
+ l_count = 0;
+ padn = 0;
+
+ if (*fmt == '%') {
+ fmt++;
+ /* Check the format specifier */
+loop:
+ switch (*fmt) {
+ case '%':
+ (void)putchar('%');
+ break;
+ case 'i': /* Fall through to next one */
+ case 'd':
+ num = get_num_va_args(args, l_count);
+ if (num < 0) {
+ (void)putchar('-');
+ unum = (unsigned long long int)-num;
+ padn--;
+ } else
+ unum = (unsigned long long int)num;
+
+ count += unsigned_num_print(unum, 10,
+ padc, padn);
+ break;
+ case 's':
+ str = va_arg(args, char *);
+ count += string_print(str);
+ break;
+ case 'p':
+ unum = (uintptr_t)va_arg(args, void *);
+ if (unum > 0U) {
+ count += string_print("0x");
+ padn -= 2;
+ }
+
+ count += unsigned_num_print(unum, 16,
+ padc, padn);
+ break;
+ case 'x':
+ unum = get_unum_va_args(args, l_count);
+ count += unsigned_num_print(unum, 16,
+ padc, padn);
+ break;
+ case 'z':
+ if (sizeof(size_t) == 8U)
+ l_count = 2;
+
+ fmt++;
+ goto loop;
+ case 'l':
+ l_count++;
+ fmt++;
+ goto loop;
+ case 'u':
+ unum = get_unum_va_args(args, l_count);
+ count += unsigned_num_print(unum, 10,
+ padc, padn);
+ break;
+ case '0':
+ padc = '0';
+ padn = 0;
+ fmt++;
+
+ for (;;) {
+ char ch = *fmt;
+ if ((ch < '0') || (ch > '9')) {
+ goto loop;
+ }
+ padn = (padn * 10) + (ch - '0');
+ fmt++;
+ }
+ assert(0); /* Unreachable */
+ default:
+ /* Exit on any other format specifier */
+ return -1;
+ }
+ fmt++;
+ continue;
+ }
+ (void)putchar(*fmt);
+ fmt++;
+ count++;
+ }
+
+ return count;
+}
+
+int printf(const char *fmt, ...)
+{
+ int count;
+ va_list va;
+
+ va_start(va, fmt);
+ count = vprintf(fmt, va);
+ va_end(va);
+
+ return count;
+}