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  1. /*
  2.  * Copyright (C) 2006 Martin Decky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #include "printf.h"
  30. #include "ofw.h"
  31.  
  32. static char digits[] = "0123456789abcdef";  /**< Hexadecimal characters */
  33.  
  34.  
  35. /** Print hexadecimal digits
  36.  *
  37.  * Print fixed count of hexadecimal digits from
  38.  * the number num. The digits are printed in
  39.  * natural left-to-right order starting with
  40.  * the width-th digit.
  41.  *
  42.  * @param num   Number containing digits.
  43.  * @param width Count of digits to print.
  44.  *
  45.  */
  46. static void print_fixed_hex(const __u64 num, const int width)
  47. {
  48.     int i;
  49.    
  50.     for (i = width * 8 - 4; i >= 0; i -= 4)
  51.         ofw_write(digits + ((num >> i) & 0xf), 1);
  52. }
  53.  
  54.  
  55. /** Print number in given base
  56.  *
  57.  * Print significant digits of a number in given
  58.  * base.
  59.  *
  60.  * @param num  Number to print.
  61.  * @param base Base to print the number in (should
  62.  *             be in range 2 .. 16).
  63.  *
  64.  */
  65. static void print_number(const __native num, const unsigned int base)
  66. {
  67.     int val = num;
  68.     char d[sizeof(__native) * 8 + 1];       /* this is good enough even for base == 2 */
  69.     int i = sizeof(__native) * 8 - 1;
  70.    
  71.     do {
  72.         d[i--] = digits[val % base];
  73.     } while (val /= base);
  74.    
  75.     d[sizeof(__native) * 8] = 0;   
  76.     ofw_puts(&d[i + 1]);
  77. }
  78.  
  79.  
  80. /** General formatted text print
  81.  *
  82.  * Print text formatted according the fmt parameter
  83.  * and variant arguments. Each formatting directive
  84.  * begins with \% (percentage) character and one of the
  85.  * following character:
  86.  *
  87.  * \%    Prints the percentage character.
  88.  *
  89.  * s    The next variant argument is treated as char*
  90.  *      and printed as a NULL terminated string.
  91.  *
  92.  * c    The next variant argument is treated as a single char.
  93.  *
  94.  * p    The next variant argument is treated as a maximum
  95.  *      bit-width integer with respect to architecture
  96.  *      and printed in full hexadecimal width.
  97.  *
  98.  * P    As with 'p', but '0x' is prefixed.
  99.  *
  100.  * q    The next variant argument is treated as a 64b integer
  101.  *      and printed in full hexadecimal width.
  102.  *
  103.  * Q    As with 'q', but '0x' is prefixed.
  104.  *
  105.  * l    The next variant argument is treated as a 32b integer
  106.  *      and printed in full hexadecimal width.
  107.  *
  108.  * L    As with 'l', but '0x' is prefixed.
  109.  *
  110.  * w    The next variant argument is treated as a 16b integer
  111.  *      and printed in full hexadecimal width.
  112.  *
  113.  * W    As with 'w', but '0x' is prefixed.
  114.  *
  115.  * b    The next variant argument is treated as a 8b integer
  116.  *      and printed in full hexadecimal width.
  117.  *
  118.  * B    As with 'b', but '0x' is prefixed.
  119.  *
  120.  * d    The next variant argument is treated as integer
  121.  *      and printed in standard decimal format (only significant
  122.  *      digits).
  123.  *
  124.  * x    The next variant argument is treated as integer
  125.  *      and printed in standard hexadecimal format (only significant
  126.  *      digits).
  127.  *
  128.  * X    As with 'x', but '0x' is prefixed.
  129.  *
  130.  * All other characters from fmt except the formatting directives
  131.  * are printed in verbatim.
  132.  *
  133.  * @param fmt Formatting NULL terminated string.
  134.  */
  135. void printf(const char *fmt, ...)
  136. {
  137.     int i = 0;
  138.     va_list ap;
  139.     char c;
  140.    
  141.     va_start(ap, fmt);
  142.    
  143.     while ((c = fmt[i++])) {
  144.         switch (c) {
  145.            
  146.             /* control character */
  147.             case '%':
  148.                
  149.                 switch (c = fmt[i++]) {
  150.                    
  151.                     /* percentile itself */
  152.                     case '%':
  153.                         break;
  154.                    
  155.                     /*
  156.                      * String and character conversions.
  157.                      */
  158.                     case 's':
  159.                         ofw_puts(va_arg(ap, char_ptr));
  160.                         goto loop;
  161.                    
  162.                     case 'c':
  163.                         c = (char) va_arg(ap, int);
  164.                         break;
  165.                    
  166.                     /*
  167.                      * Hexadecimal conversions with fixed width.
  168.                      */
  169.                     case 'P':
  170.                         ofw_puts("0x");
  171.                     case 'p':
  172.                         print_fixed_hex(va_arg(ap, __native), sizeof(__native));
  173.                         goto loop;
  174.                    
  175.                     case 'Q':
  176.                         ofw_puts("0x");
  177.                     case 'q':
  178.                         print_fixed_hex(va_arg(ap, __u64), INT64);
  179.                         goto loop;
  180.                    
  181.                     case 'L':
  182.                         ofw_puts("0x");
  183.                     case 'l':
  184.                         print_fixed_hex(va_arg(ap, __native), INT32);
  185.                         goto loop;
  186.                    
  187.                     case 'W':
  188.                         ofw_puts("0x");
  189.                     case 'w':
  190.                         print_fixed_hex(va_arg(ap, __native), INT16);
  191.                         goto loop;
  192.                    
  193.                     case 'B':
  194.                         ofw_puts("0x");
  195.                     case 'b':
  196.                         print_fixed_hex(va_arg(ap, __native), INT8);
  197.                         goto loop;
  198.                    
  199.                     /*
  200.                      * Decimal and hexadecimal conversions.
  201.                      */
  202.                     case 'd':
  203.                         print_number(va_arg(ap, __native), 10);
  204.                         goto loop;
  205.                    
  206.                     case 'X':
  207.                         ofw_puts("0x");
  208.                     case 'x':
  209.                         print_number(va_arg(ap, __native), 16);
  210.                         goto loop;
  211.                    
  212.                     /*
  213.                      * Bad formatting.
  214.                      */
  215.                     default:
  216.                         goto out;
  217.             }
  218.            
  219.             default:
  220.                 ofw_write(&c, 1);
  221.         }
  222.    
  223. loop:
  224.         ;
  225.     }
  226.    
  227. out:
  228.    
  229.     va_end(ap);
  230. }
  231.