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Diffstat (limited to 'lib/stdlib/printf.c')
-rw-r--r-- | lib/stdlib/printf.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/stdlib/printf.c b/lib/stdlib/printf.c new file mode 100644 index 000000000..6329157d0 --- /dev/null +++ b/lib/stdlib/printf.c @@ -0,0 +1,36 @@ +/* + * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <stdarg.h> +#include <stdio.h> + +/* Choose max of 512 chars for now. */ +#define PRINT_BUFFER_SIZE 512 +int printf(const char *fmt, ...) +{ + va_list args; + char buf[PRINT_BUFFER_SIZE]; + int count; + + va_start(args, fmt); + vsnprintf(buf, sizeof(buf) - 1, fmt, args); + va_end(args); + + /* Use putchar directly as 'puts()' adds a newline. */ + buf[PRINT_BUFFER_SIZE - 1] = '\0'; + count = 0; + while (buf[count]) + { + if (putchar(buf[count]) != EOF) { + count++; + } else { + count = EOF; + break; + } + } + + return count; +} |