351 lines
6.9 KiB
C
351 lines
6.9 KiB
C
/*
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* Copyright (C) 2001 MontaVista Software Inc.
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* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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*/
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#include "printf.h"
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extern void board_putc(int ch);
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/* this is the maximum width for a variable */
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#define LP_MAX_BUF 256
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/* macros */
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#define IsDigit(x) ( ((x) >= '0') && ((x) <= '9') )
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#define Ctod(x) ( (x) - '0')
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/* forward declaration */
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static int PrintChar(char *, char, int, int);
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static int PrintString(char *, char *, int, int);
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static int PrintNum(char *, unsigned long, int, int, int, int, char, int);
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/* private variable */
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static const char theFatalMsg[] = "fatal error in lp_Print!";
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/* -*-
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* A low level printf() function.
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*/
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static void
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lp_Print(void (*output)(void *, char *, int),
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void * arg,
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char *fmt,
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va_list ap)
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{
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#define OUTPUT(arg, s, l) \
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{ if (((l) < 0) || ((l) > LP_MAX_BUF)) { \
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(*output)(arg, (char*)theFatalMsg, sizeof(theFatalMsg)-1); for(;;); \
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} else { \
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(*output)(arg, s, l); \
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} \
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}
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char buf[LP_MAX_BUF];
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char c;
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char *s;
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long int num;
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int longFlag;
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int negFlag;
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int width;
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int prec;
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int ladjust;
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char padc;
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int length;
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for(;;) {
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{
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/* scan for the next '%' */
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char *fmtStart = fmt;
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while ( (*fmt != '\0') && (*fmt != '%')) {
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fmt ++;
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}
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/* flush the string found so far */
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OUTPUT(arg, fmtStart, fmt-fmtStart);
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/* are we hitting the end? */
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if (*fmt == '\0') break;
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}
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/* we found a '%' */
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fmt ++;
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/* check for long */
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if (*fmt == 'l') {
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longFlag = 1;
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fmt ++;
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} else {
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longFlag = 0;
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}
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/* check for other prefixes */
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width = 0;
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prec = -1;
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ladjust = 0;
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padc = ' ';
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if (*fmt == '-') {
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ladjust = 1;
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fmt ++;
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}
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if (*fmt == '0') {
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padc = '0';
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fmt++;
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}
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if (IsDigit(*fmt)) {
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while (IsDigit(*fmt)) {
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width = 10 * width + Ctod(*fmt++);
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}
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}
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if (*fmt == '.') {
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fmt ++;
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if (IsDigit(*fmt)) {
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prec = 0;
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while (IsDigit(*fmt)) {
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prec = prec*10 + Ctod(*fmt++);
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}
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}
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}
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/* check format flag */
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negFlag = 0;
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switch (*fmt) {
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case 'b':
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if (longFlag) {
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num = va_arg(ap, long int);
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} else {
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num = va_arg(ap, int);
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}
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length = PrintNum(buf, num, 2, 0, width, ladjust, padc, 0);
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OUTPUT(arg, buf, length);
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break;
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case 'd':
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case 'D':
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if (longFlag) {
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num = va_arg(ap, long int);
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} else {
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num = va_arg(ap, int);
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}
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if (num < 0) {
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num = - num;
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negFlag = 1;
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}
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length = PrintNum(buf, num, 10, negFlag, width, ladjust, padc, 0);
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OUTPUT(arg, buf, length);
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break;
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case 'o':
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case 'O':
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if (longFlag) {
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num = va_arg(ap, long int);
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} else {
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num = va_arg(ap, int);
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}
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length = PrintNum(buf, num, 8, 0, width, ladjust, padc, 0);
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OUTPUT(arg, buf, length);
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break;
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case 'u':
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case 'U':
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if (longFlag) {
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num = va_arg(ap, long int);
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} else {
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num = va_arg(ap, int);
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}
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length = PrintNum(buf, num, 10, 0, width, ladjust, padc, 0);
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OUTPUT(arg, buf, length);
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break;
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case 'x':
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if (longFlag) {
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num = va_arg(ap, long int);
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} else {
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num = va_arg(ap, int);
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}
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length = PrintNum(buf, num, 16, 0, width, ladjust, padc, 0);
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OUTPUT(arg, buf, length);
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break;
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case 'X':
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if (longFlag) {
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num = va_arg(ap, long int);
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} else {
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num = va_arg(ap, int);
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}
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length = PrintNum(buf, num, 16, 0, width, ladjust, padc, 1);
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OUTPUT(arg, buf, length);
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break;
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case 'c':
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c = (char)va_arg(ap, int);
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length = PrintChar(buf, c, width, ladjust);
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OUTPUT(arg, buf, length);
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break;
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case 's':
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s = (char*)va_arg(ap, char *);
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length = PrintString(buf, s, width, ladjust);
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OUTPUT(arg, buf, length);
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break;
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case '\0':
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fmt --;
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break;
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default:
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/* output this char as it is */
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OUTPUT(arg, fmt, 1);
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} /* switch (*fmt) */
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fmt ++;
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} /* for(;;) */
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/* special termination call */
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OUTPUT(arg, "\0", 1);
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}
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/* --------------- local help functions --------------------- */
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static int
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PrintChar(char * buf, char c, int length, int ladjust)
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{
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int i;
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if (length < 1) length = 1;
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if (ladjust) {
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*buf = c;
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for (i=1; i< length; i++) buf[i] = ' ';
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} else {
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for (i=0; i< length-1; i++) buf[i] = ' ';
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buf[length - 1] = c;
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}
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return length;
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}
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static int
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PrintString(char * buf, char* s, int length, int ladjust)
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{
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int i;
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int len=0;
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char* s1 = s;
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while (*s1++) len++;
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if (length < len) length = len;
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if (ladjust) {
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for (i=0; i< len; i++) buf[i] = s[i];
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for (i=len; i< length; i++) buf[i] = ' ';
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} else {
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for (i=0; i< length-len; i++) buf[i] = ' ';
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for (i=length-len; i < length; i++) buf[i] = s[i-length+len];
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}
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return length;
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}
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static int
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PrintNum(char * buf, unsigned long u, int base, int negFlag,
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int length, int ladjust, char padc, int upcase)
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{
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/* algorithm :
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* 1. prints the number from left to right in reverse form.
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* 2. fill the remaining spaces with padc if length is longer than
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* the actual length
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* TRICKY : if left adjusted, no "0" padding.
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* if negtive, insert "0" padding between "0" and number.
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* 3. if (!ladjust) we reverse the whole string including paddings
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* 4. otherwise we only reverse the actual string representing the num.
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*/
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int actualLength =0;
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char *p = buf;
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int i;
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do {
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int tmp = u %base;
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if (tmp <= 9) {
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*p++ = '0' + tmp;
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} else if (upcase) {
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*p++ = 'A' + tmp - 10;
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} else {
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*p++ = 'a' + tmp - 10;
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}
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u /= base;
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} while (u != 0);
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if (negFlag) {
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*p++ = '-';
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}
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/* figure out actual length and adjust the maximum length */
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actualLength = p - buf;
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if (length < actualLength) length = actualLength;
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/* add padding */
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if (ladjust) {
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padc = ' ';
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}
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if (negFlag && !ladjust && (padc == '0')) {
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for (i = actualLength-1; i< length-1; i++) buf[i] = padc;
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buf[length -1] = '-';
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} else {
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for (i = actualLength; i< length; i++) buf[i] = padc;
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}
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/* prepare to reverse the string */
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{
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int begin = 0;
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int end;
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if (ladjust) {
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end = actualLength - 1;
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} else {
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end = length -1;
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}
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while (end > begin) {
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char tmp = buf[begin];
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buf[begin] = buf[end];
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buf[end] = tmp;
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begin ++;
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end --;
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}
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}
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/* adjust the string pointer */
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return length;
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}
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static void printf_output(void *arg, char *s, int l)
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{
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int i;
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// special termination call
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if ((l==1) && (s[0] == '\0')) return;
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for (i=0; i< l; i++) {
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board_putc(s[i]);
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if (s[i] == '\n') board_putc('\r');
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}
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}
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void printf(char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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lp_Print(printf_output, 0, fmt, ap);
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va_end(ap);
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}
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