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/******************************************************************************
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* *
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* License Agreement *
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* *
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* Copyright (c) 2006 Altera Corporation, San Jose, California, USA. *
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* All rights reserved. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING *
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER *
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* DEALINGS IN THE SOFTWARE. *
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* *
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* This agreement shall be governed in all respects by the laws of the State *
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* of California and by the laws of the United States of America. *
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* *
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* Altera does not recommend, suggest or require that this reference design *
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* file be used in conjunction or combination with any other product. *
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******************************************************************************/
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/*
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* This file provides a very minimal printf implementation for use with very
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* small applications. Only the following format strings are supported:
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* %x
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* %s
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* %c
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* %%
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*/
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#include <stdarg.h>
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#include "sys/alt_stdio.h"
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/*
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* ALT printf function
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*/
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void
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alt_printf(const char* fmt, ... )
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{
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va_list args;
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va_start(args, fmt);
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const char *w;
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char c;
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/* Process format string. */
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w = fmt;
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while ((c = *w++) != 0)
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{
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/* If not a format escape character, just print */
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/* character. Otherwise, process format string. */
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if (c != '%')
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{
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alt_putchar(c);
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}
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else
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{
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/* Get format character. If none */
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/* available, processing is complete. */
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if ((c = *w++) != 0)
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{
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if (c == '%')
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{
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/* Process "%" escape sequence. */
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alt_putchar(c);
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}
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else if (c == 'c')
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{
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int v = va_arg(args, int);
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alt_putchar(v);
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}
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else if (c == 'x')
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{
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/* Process hexadecimal number format. */
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unsigned long v = va_arg(args, unsigned long);
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unsigned long digit;
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int digit_shift;
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/* If the number value is zero, just print and continue. */
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if (v == 0)
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{
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alt_putchar('0');
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continue;
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}
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/* Find first non-zero digit. */
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digit_shift = 28;
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while (!(v & (0xF << digit_shift)))
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digit_shift -= 4;
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/* Print digits. */
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for (; digit_shift >= 0; digit_shift -= 4)
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{
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digit = (v & (0xF << digit_shift)) >> digit_shift;
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if (digit <= 9)
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c = '0' + digit;
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else
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c = 'a' + digit - 10;
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alt_putchar(c);
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}
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}
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else if (c == 's')
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{
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/* Process string format. */
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char *s = va_arg(args, char *);
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while(*s)
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alt_putchar(*s++);
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}
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}
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else
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{
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break;
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}
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}
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}
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}
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