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  1. /*
  2.  * Copyright (c) 2001-2004 Jakub Jermar
  3.  * Copyright (c) 2006 Josef Cejka
  4.  * Copyright (c) 2009 Martin Decky
  5.  * All rights reserved.
  6.  *
  7.  * Redistribution and use in source and binary forms, with or without
  8.  * modification, are permitted provided that the following conditions
  9.  * are met:
  10.  *
  11.  * - Redistributions of source code must retain the above copyright
  12.  *   notice, this list of conditions and the following disclaimer.
  13.  * - Redistributions in binary form must reproduce the above copyright
  14.  *   notice, this list of conditions and the following disclaimer in the
  15.  *   documentation and/or other materials provided with the distribution.
  16.  * - The name of the author may not be used to endorse or promote products
  17.  *   derived from this software without specific prior written permission.
  18.  *
  19.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  20.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  21.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  23.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  24.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  28.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30.  
  31. /** @addtogroup generic
  32.  * @{
  33.  */
  34. /**
  35.  * @file
  36.  * @brief Printing functions.
  37.  */
  38.  
  39. #include <printf/printf_core.h>
  40. #include <print.h>
  41. #include <arch/arg.h>
  42. #include <macros.h>
  43. #include <string.h>
  44. #include <arch.h>
  45.  
  46. /** show prefixes 0x or 0 */
  47. #define __PRINTF_FLAG_PREFIX       0x00000001
  48. /** signed / unsigned number */
  49. #define __PRINTF_FLAG_SIGNED       0x00000002
  50. /** print leading zeroes */
  51. #define __PRINTF_FLAG_ZEROPADDED   0x00000004
  52. /** align to left */
  53. #define __PRINTF_FLAG_LEFTALIGNED  0x00000010
  54. /** always show + sign */
  55. #define __PRINTF_FLAG_SHOWPLUS     0x00000020
  56. /** print space instead of plus */
  57. #define __PRINTF_FLAG_SPACESIGN    0x00000040
  58. /** show big characters */
  59. #define __PRINTF_FLAG_BIGCHARS     0x00000080
  60. /** number has - sign */
  61. #define __PRINTF_FLAG_NEGATIVE     0x00000100
  62.  
  63. /**
  64.  * Buffer big enough for 64-bit number printed in base 2, sign, prefix and 0
  65.  * to terminate string... (last one is only for better testing end of buffer by
  66.  * zero-filling subroutine)
  67.  */
  68. #define PRINT_NUMBER_BUFFER_SIZE  (64 + 5)
  69.  
  70. /** Enumeration of possible arguments types.
  71.  */
  72. typedef enum {
  73.     PrintfQualifierByte = 0,
  74.     PrintfQualifierShort,
  75.     PrintfQualifierInt,
  76.     PrintfQualifierLong,
  77.     PrintfQualifierLongLong,
  78.     PrintfQualifierPointer
  79. } qualifier_t;
  80.  
  81. static char nullstr[] = "(NULL)";
  82. static char digits_small[] = "0123456789abcdef";
  83. static char digits_big[] = "0123456789ABCDEF";
  84.  
  85. /** Print one or more characters without adding newline.
  86.  *
  87.  * @param buf  Buffer holding characters with size of
  88.  *             at least size bytes. NULL is not allowed!
  89.  * @param size Size of the buffer in bytes.
  90.  * @param ps   Output method and its data.
  91.  *
  92.  * @return Number of characters printed.
  93.  *
  94.  */
  95. static int printf_putnchars(const char *buf, size_t size,
  96.     printf_spec_t *ps)
  97. {
  98.     return ps->str_write((void *) buf, size, ps->data);
  99. }
  100.  
  101. /** Print one or more wide characters without adding newline.
  102.  *
  103.  * @param buf  Buffer holding wide characters with size of
  104.  *             at least size bytes. NULL is not allowed!
  105.  * @param size Size of the buffer in bytes.
  106.  * @param ps   Output method and its data.
  107.  *
  108.  * @return Number of wide characters printed.
  109.  *
  110.  */
  111. static int printf_wputnchars(const wchar_t *buf, size_t size,
  112.     printf_spec_t *ps)
  113. {
  114.     return ps->wstr_write((void *) buf, size, ps->data);
  115. }
  116.  
  117. /** Print string without adding a newline.
  118.  *
  119.  * @param str String to print.
  120.  * @param ps  Write function specification and support data.
  121.  *
  122.  * @return Number of characters printed.
  123.  *
  124.  */
  125. static int printf_putstr(const char *str, printf_spec_t *ps)
  126. {
  127.     if (str == NULL)
  128.         return printf_putnchars(nullstr, str_size(nullstr), ps);
  129.    
  130.     return ps->str_write((void *) str, str_size(str), ps->data);
  131. }
  132.  
  133. /** Print one ASCII character.
  134.  *
  135.  * @param c  ASCII character to be printed.
  136.  * @param ps Output method.
  137.  *
  138.  * @return Number of characters printed.
  139.  *
  140.  */
  141. static int printf_putchar(const char ch, printf_spec_t *ps)
  142. {
  143.     if (!ascii_check(ch))
  144.         return ps->str_write((void *) &invalch, 1, ps->data);
  145.    
  146.     return ps->str_write(&ch, 1, ps->data);
  147. }
  148.  
  149. /** Print one wide character.
  150.  *
  151.  * @param c  Wide character to be printed.
  152.  * @param ps Output method.
  153.  *
  154.  * @return Number of characters printed.
  155.  *
  156.  */
  157. static int printf_putwchar(const wchar_t ch, printf_spec_t *ps)
  158. {
  159.     if (!chr_check(ch))
  160.         return ps->str_write((void *) &invalch, 1, ps->data);
  161.    
  162.     return ps->wstr_write(&ch, sizeof(wchar_t), ps->data);
  163. }
  164.  
  165. /** Print one formatted ASCII character.
  166.  *
  167.  * @param ch    Character to print.
  168.  * @param width Width modifier.
  169.  * @param flags Flags that change the way the character is printed.
  170.  *
  171.  * @return Number of characters printed, negative value on failure.
  172.  *
  173.  */
  174. static int print_char(const char ch, int width, uint32_t flags, printf_spec_t *ps)
  175. {
  176.     count_t counter = 0;
  177.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  178.         while (--width > 0) {
  179.             /*
  180.              * One space is consumed by the character itself, hence
  181.              * the predecrement.
  182.              */
  183.             if (printf_putchar(' ', ps) > 0)
  184.                 counter++;
  185.         }
  186.     }
  187.    
  188.     if (printf_putchar(ch, ps) > 0)
  189.         counter++;
  190.    
  191.     while (--width > 0) {
  192.         /*
  193.          * One space is consumed by the character itself, hence
  194.          * the predecrement.
  195.          */
  196.         if (printf_putchar(' ', ps) > 0)
  197.             counter++;
  198.     }
  199.    
  200.     return (int) (counter + 1);
  201. }
  202.  
  203. /** Print one formatted wide character.
  204.  *
  205.  * @param ch    Character to print.
  206.  * @param width Width modifier.
  207.  * @param flags Flags that change the way the character is printed.
  208.  *
  209.  * @return Number of characters printed, negative value on failure.
  210.  *
  211.  */
  212. static int print_wchar(const wchar_t ch, int width, uint32_t flags, printf_spec_t *ps)
  213. {
  214.     count_t counter = 0;
  215.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  216.         while (--width > 0) {
  217.             /*
  218.              * One space is consumed by the character itself, hence
  219.              * the predecrement.
  220.              */
  221.             if (printf_putchar(' ', ps) > 0)
  222.                 counter++;
  223.         }
  224.     }
  225.    
  226.     if (printf_putwchar(ch, ps) > 0)
  227.         counter++;
  228.    
  229.     while (--width > 0) {
  230.         /*
  231.          * One space is consumed by the character itself, hence
  232.          * the predecrement.
  233.          */
  234.         if (printf_putchar(' ', ps) > 0)
  235.             counter++;
  236.     }
  237.    
  238.     return (int) (counter + 1);
  239. }
  240.  
  241. /** Print string.
  242.  *
  243.  * @param str       String to be printed.
  244.  * @param width     Width modifier.
  245.  * @param precision Precision modifier.
  246.  * @param flags     Flags that modify the way the string is printed.
  247.  *
  248.  * @return Number of characters printed, negative value on failure.
  249.  */
  250. static int print_str(char *str, int width, unsigned int precision,
  251.     uint32_t flags, printf_spec_t *ps)
  252. {
  253.     if (str == NULL)
  254.         return printf_putstr(nullstr, ps);
  255.  
  256.     /* Print leading spaces. */
  257.     count_t strw = str_length(str);
  258.     if (precision == 0)
  259.         precision = strw;
  260.  
  261.     /* Left padding */
  262.     count_t counter = 0;
  263.     width -= precision;
  264.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  265.         while (width-- > 0) {
  266.             if (printf_putchar(' ', ps) == 1)
  267.                 counter++;
  268.         }
  269.     }
  270.  
  271.     /* Part of @a str fitting into the alloted space. */
  272.     int retval;
  273.     size_t size = str_lsize(str, precision);
  274.     if ((retval = printf_putnchars(str, size, ps)) < 0)
  275.         return -counter;
  276.  
  277.     counter += retval;
  278.  
  279.     /* Right padding */
  280.     while (width-- > 0) {
  281.         if (printf_putchar(' ', ps) == 1)
  282.             counter++;
  283.     }
  284.  
  285.     return ((int) counter);
  286.  
  287. }
  288.  
  289. /** Print wide string.
  290.  *
  291.  * @param str       Wide string to be printed.
  292.  * @param width     Width modifier.
  293.  * @param precision Precision modifier.
  294.  * @param flags     Flags that modify the way the string is printed.
  295.  *
  296.  * @return Number of wide characters printed, negative value on failure.
  297.  */
  298. static int print_wstr(wchar_t *str, int width, unsigned int precision,
  299.     uint32_t flags, printf_spec_t *ps)
  300. {
  301.     if (str == NULL)
  302.         return printf_putstr(nullstr, ps);
  303.  
  304.     /* Print leading spaces. */
  305.     size_t strw = wstr_length(str);
  306.     if (precision == 0)
  307.         precision = strw;
  308.  
  309.     /* Left padding */
  310.     count_t counter = 0;
  311.     width -= precision;
  312.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  313.         while (width-- > 0) {
  314.             if (printf_putchar(' ', ps) == 1)
  315.                 counter++;
  316.         }
  317.     }
  318.  
  319.     /* Part of @a wstr fitting into the alloted space. */
  320.     int retval;
  321.     size_t size = wstr_lsize(str, precision);
  322.     if ((retval = printf_wputnchars(str, size, ps)) < 0)
  323.         return -counter;
  324.  
  325.     counter += retval;
  326.  
  327.     /* Right padding */
  328.     while (width-- > 0) {
  329.         if (printf_putchar(' ', ps) == 1)
  330.             counter++;
  331.     }
  332.  
  333.     return ((int) counter);
  334. }
  335.  
  336. /** Print a number in a given base.
  337.  *
  338.  * Print significant digits of a number in given base.
  339.  *
  340.  * @param num       Number to print.
  341.  * @param width     Width modifier.
  342.  * @param precision Precision modifier.
  343.  * @param base      Base to print the number in (must be between 2 and 16).
  344.  * @param flags     Flags that modify the way the number is printed.
  345.  *
  346.  * @return Number of characters printed.
  347.  *
  348.  */
  349. static int print_number(uint64_t num, int width, int precision, int base,
  350.     uint32_t flags, printf_spec_t *ps)
  351. {
  352.     char *digits;
  353.     if (flags & __PRINTF_FLAG_BIGCHARS)
  354.         digits = digits_big;
  355.     else
  356.         digits = digits_small;
  357.    
  358.     char data[PRINT_NUMBER_BUFFER_SIZE];
  359.     char *ptr = &data[PRINT_NUMBER_BUFFER_SIZE - 1];
  360.    
  361.     /* Size of number with all prefixes and signs */
  362.     int size = 0;
  363.    
  364.     /* Put zero at end of string */
  365.     *ptr-- = 0;
  366.    
  367.     if (num == 0) {
  368.         *ptr-- = '0';
  369.         size++;
  370.     } else {
  371.         do {
  372.             *ptr-- = digits[num % base];
  373.             size++;
  374.         } while (num /= base);
  375.     }
  376.    
  377.     /* Size of plain number */
  378.     int number_size = size;
  379.    
  380.     /*
  381.      * Collect the sum of all prefixes/signs/etc. to calculate padding and
  382.      * leading zeroes.
  383.      */
  384.     if (flags & __PRINTF_FLAG_PREFIX) {
  385.         switch(base) {
  386.         case 2:
  387.             /* Binary formating is not standard, but usefull */
  388.             size += 2;
  389.             break;
  390.         case 8:
  391.             size++;
  392.             break;
  393.         case 16:
  394.             size += 2;
  395.             break;
  396.         }
  397.     }
  398.    
  399.     char sgn = 0;
  400.     if (flags & __PRINTF_FLAG_SIGNED) {
  401.         if (flags & __PRINTF_FLAG_NEGATIVE) {
  402.             sgn = '-';
  403.             size++;
  404.         } else if (flags & __PRINTF_FLAG_SHOWPLUS) {
  405.             sgn = '+';
  406.             size++;
  407.         } else if (flags & __PRINTF_FLAG_SPACESIGN) {
  408.             sgn = ' ';
  409.             size++;
  410.         }
  411.     }
  412.    
  413.     if (flags & __PRINTF_FLAG_LEFTALIGNED)
  414.         flags &= ~__PRINTF_FLAG_ZEROPADDED;
  415.    
  416.     /*
  417.      * If the number is left-aligned or precision is specified then
  418.      * padding with zeros is ignored.
  419.      */
  420.     if (flags & __PRINTF_FLAG_ZEROPADDED) {
  421.         if ((precision == 0) && (width > size))
  422.             precision = width - size + number_size;
  423.     }
  424.    
  425.     /* Print leading spaces */
  426.     if (number_size > precision) {
  427.         /* Print the whole number, not only a part */
  428.         precision = number_size;
  429.     }
  430.    
  431.     width -= precision + size - number_size;
  432.     count_t counter = 0;
  433.    
  434.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  435.         while (width-- > 0) {
  436.             if (printf_putchar(' ', ps) == 1)
  437.                 counter++;
  438.         }
  439.     }
  440.    
  441.     /* Print sign */
  442.     if (sgn) {
  443.         if (printf_putchar(sgn, ps) == 1)
  444.             counter++;
  445.     }
  446.    
  447.     /* Print prefix */
  448.     if (flags & __PRINTF_FLAG_PREFIX) {
  449.         switch(base) {
  450.         case 2:
  451.             /* Binary formating is not standard, but usefull */
  452.             if (printf_putchar('0', ps) == 1)
  453.                 counter++;
  454.             if (flags & __PRINTF_FLAG_BIGCHARS) {
  455.                 if (printf_putchar('B', ps) == 1)
  456.                     counter++;
  457.             } else {
  458.                 if (printf_putchar('b', ps) == 1)
  459.                     counter++;
  460.             }
  461.             break;
  462.         case 8:
  463.             if (printf_putchar('o', ps) == 1)
  464.                 counter++;
  465.             break;
  466.         case 16:
  467.             if (printf_putchar('0', ps) == 1)
  468.                 counter++;
  469.             if (flags & __PRINTF_FLAG_BIGCHARS) {
  470.                 if (printf_putchar('X', ps) == 1)
  471.                     counter++;
  472.             } else {
  473.                 if (printf_putchar('x', ps) == 1)
  474.                     counter++;
  475.             }
  476.             break;
  477.         }
  478.     }
  479.    
  480.     /* Print leading zeroes */
  481.     precision -= number_size;
  482.     while (precision-- > 0) {
  483.         if (printf_putchar('0', ps) == 1)
  484.             counter++;
  485.     }
  486.    
  487.     /* Print the number itself */
  488.     int retval;
  489.     if ((retval = printf_putstr(++ptr, ps)) > 0)
  490.         counter += retval;
  491.    
  492.     /* Print tailing spaces */
  493.    
  494.     while (width-- > 0) {
  495.         if (printf_putchar(' ', ps) == 1)
  496.             counter++;
  497.     }
  498.    
  499.     return ((int) counter);
  500. }
  501.  
  502. /** Print formatted string.
  503.  *
  504.  * Print string formatted according to the fmt parameter and variadic arguments.
  505.  * Each formatting directive must have the following form:
  506.  *
  507.  *  \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
  508.  *
  509.  * FLAGS:@n
  510.  *  - "#" Force to print prefix. For \%o conversion, the prefix is 0, for
  511.  *        \%x and \%X prefixes are 0x and 0X and for conversion \%b the
  512.  *        prefix is 0b.
  513.  *
  514.  *  - "-" Align to left.
  515.  *
  516.  *  - "+" Print positive sign just as negative.
  517.  *
  518.  *  - " " If the printed number is positive and "+" flag is not set,
  519.  *        print space in place of sign.
  520.  *
  521.  *  - "0" Print 0 as padding instead of spaces. Zeroes are placed between
  522.  *        sign and the rest of the number. This flag is ignored if "-"
  523.  *        flag is specified.
  524.  *
  525.  * WIDTH:@n
  526.  *  - Specify the minimal width of a printed argument. If it is bigger,
  527.  *    width is ignored. If width is specified with a "*" character instead of
  528.  *    number, width is taken from parameter list. And integer parameter is
  529.  *    expected before parameter for processed conversion specification. If
  530.  *    this value is negative its absolute value is taken and the "-" flag is
  531.  *    set.
  532.  *
  533.  * PRECISION:@n
  534.  *  - Value precision. For numbers it specifies minimum valid numbers.
  535.  *    Smaller numbers are printed with leading zeroes. Bigger numbers are not
  536.  *    affected. Strings with more than precision characters are cut off. Just
  537.  *    as with width, an "*" can be used used instead of a number. An integer
  538.  *    value is then expected in parameters. When both width and precision are
  539.  *    specified using "*", the first parameter is used for width and the
  540.  *    second one for precision.
  541.  *
  542.  * TYPE:@n
  543.  *  - "hh" Signed or unsigned char.@n
  544.  *  - "h"  Signed or unsigned short.@n
  545.  *  - ""   Signed or unsigned int (default value).@n
  546.  *  - "l"  Signed or unsigned long int.@n
  547.  *         If conversion is "c", the character is wchar_t (wide character).@n
  548.  *         If conversion is "s", the string is wchar_t * (wide string).@n
  549.  *  - "ll" Signed or unsigned long long int.@n
  550.  *
  551.  * CONVERSION:@n
  552.  *  - % Print percentile character itself.
  553.  *
  554.  *  - c Print single character. The character is expected to be plain
  555.  *      ASCII (e.g. only values 0 .. 127 are valid).@n
  556.  *      If type is "l", then the character is expected to be wide character
  557.  *      (e.g. values 0 .. 0x10ffff are valid).
  558.  *
  559.  *  - s Print zero terminated string. If a NULL value is passed as
  560.  *      value, "(NULL)" is printed instead.@n
  561.  *      If type is "l", then the string is expected to be wide string.
  562.  *
  563.  *  - P, p Print value of a pointer. Void * value is expected and it is
  564.  *         printed in hexadecimal notation with prefix (as with \%#X / \%#x
  565.  *         for 32-bit or \%#X / \%#x for 64-bit long pointers).
  566.  *
  567.  *  - b Print value as unsigned binary number. Prefix is not printed by
  568.  *      default. (Nonstandard extension.)
  569.  *
  570.  *  - o Print value as unsigned octal number. Prefix is not printed by
  571.  *      default.
  572.  *
  573.  *  - d, i Print signed decimal number. There is no difference between d
  574.  *         and i conversion.
  575.  *
  576.  *  - u Print unsigned decimal number.
  577.  *
  578.  *  - X, x Print hexadecimal number with upper- or lower-case. Prefix is
  579.  *         not printed by default.
  580.  *
  581.  * All other characters from fmt except the formatting directives are printed
  582.  * verbatim.
  583.  *
  584.  * @param fmt Format NULL-terminated string.
  585.  *
  586.  * @return Number of characters printed, negative value on failure.
  587.  *
  588.  */
  589. int printf_core(const char *fmt, printf_spec_t *ps, va_list ap)
  590. {
  591.     size_t i;        /* Index of the currently processed character from fmt */
  592.     size_t nxt = 0;  /* Index of the next character from fmt */
  593.     size_t j = 0;    /* Index to the first not printed nonformating character */
  594.    
  595.     count_t counter = 0;  /* Number of characters printed */
  596.     int retval;           /* Return values from nested functions */
  597.    
  598.     while (true) {
  599.         i = nxt;
  600.         wchar_t uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  601.        
  602.         if (uc == 0)
  603.             break;
  604.        
  605.         /* Control character */
  606.         if (uc == '%') {
  607.             /* Print common characters if any processed */
  608.             if (i > j) {
  609.                 if ((retval = printf_putnchars(&fmt[j], i - j, ps)) < 0) {
  610.                     /* Error */
  611.                     counter = -counter;
  612.                     goto out;
  613.                 }
  614.                 counter += retval;
  615.             }
  616.            
  617.             j = i;
  618.            
  619.             /* Parse modifiers */
  620.             uint32_t flags = 0;
  621.             bool end = false;
  622.            
  623.             do {
  624.                 i = nxt;
  625.                 uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  626.                 switch (uc) {
  627.                 case '#':
  628.                     flags |= __PRINTF_FLAG_PREFIX;
  629.                     break;
  630.                 case '-':
  631.                     flags |= __PRINTF_FLAG_LEFTALIGNED;
  632.                     break;
  633.                 case '+':
  634.                     flags |= __PRINTF_FLAG_SHOWPLUS;
  635.                     break;
  636.                 case ' ':
  637.                     flags |= __PRINTF_FLAG_SPACESIGN;
  638.                     break;
  639.                 case '0':
  640.                     flags |= __PRINTF_FLAG_ZEROPADDED;
  641.                     break;
  642.                 default:
  643.                     end = true;
  644.                 };
  645.             } while (!end);
  646.            
  647.             /* Width & '*' operator */
  648.             int width = 0;
  649.             if (isdigit(uc)) {
  650.                 while (true) {
  651.                     width *= 10;
  652.                     width += uc - '0';
  653.                    
  654.                     i = nxt;
  655.                     uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  656.                     if (uc == 0)
  657.                         break;
  658.                     if (!isdigit(uc))
  659.                         break;
  660.                 }
  661.             } else if (uc == '*') {
  662.                 /* Get width value from argument list */
  663.                 i = nxt;
  664.                 uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  665.                 width = (int) va_arg(ap, int);
  666.                 if (width < 0) {
  667.                     /* Negative width sets '-' flag */
  668.                     width *= -1;
  669.                     flags |= __PRINTF_FLAG_LEFTALIGNED;
  670.                 }
  671.             }
  672.            
  673.             /* Precision and '*' operator */
  674.             int precision = 0;
  675.             if (uc == '.') {
  676.                 i = nxt;
  677.                 uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  678.                 if (isdigit(uc)) {
  679.                     while (true) {
  680.                         precision *= 10;
  681.                         precision += uc - '0';
  682.                        
  683.                         i = nxt;
  684.                         uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  685.                         if (uc == 0)
  686.                             break;
  687.                         if (!isdigit(uc))
  688.                             break;
  689.                     }
  690.                 } else if (uc == '*') {
  691.                     /* Get precision value from the argument list */
  692.                     i = nxt;
  693.                     uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  694.                     precision = (int) va_arg(ap, int);
  695.                     if (precision < 0) {
  696.                         /* Ignore negative precision */
  697.                         precision = 0;
  698.                     }
  699.                 }
  700.             }
  701.            
  702.             qualifier_t qualifier;
  703.            
  704.             switch (uc) {
  705.             /** @todo Unimplemented qualifiers:
  706.              *        t ptrdiff_t - ISO C 99
  707.              */
  708.             case 'h':
  709.                 /* Char or short */
  710.                 qualifier = PrintfQualifierShort;
  711.                 i = nxt;
  712.                 uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  713.                 if (uc == 'h') {
  714.                     i = nxt;
  715.                     uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  716.                     qualifier = PrintfQualifierByte;
  717.                 }
  718.                 break;
  719.             case 'l':
  720.                 /* Long or long long */
  721.                 qualifier = PrintfQualifierLong;
  722.                 i = nxt;
  723.                 uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  724.                 if (uc == 'l') {
  725.                     i = nxt;
  726.                     uc = str_decode(fmt, &nxt, STR_NO_LIMIT);
  727.                     qualifier = PrintfQualifierLongLong;
  728.                 }
  729.                 break;
  730.             default:
  731.                 /* Default type */
  732.                 qualifier = PrintfQualifierInt;
  733.             }
  734.            
  735.             unsigned int base = 10;
  736.            
  737.             switch (uc) {
  738.             /*
  739.              * String and character conversions.
  740.              */
  741.             case 's':
  742.                 if (qualifier == PrintfQualifierLong)
  743.                     retval = print_wstr(va_arg(ap, wchar_t *), width, precision, flags, ps);
  744.                 else
  745.                     retval = print_str(va_arg(ap, char *), width, precision, flags, ps);
  746.                
  747.                 if (retval < 0) {
  748.                     counter = -counter;
  749.                     goto out;
  750.                 }
  751.                
  752.                 counter += retval;
  753.                 j = nxt;
  754.                 goto next_char;
  755.             case 'c':
  756.                 if (qualifier == PrintfQualifierLong)
  757.                     retval = print_wchar(va_arg(ap, wchar_t), width, flags, ps);
  758.                 else
  759.                     retval = print_char(va_arg(ap, unsigned int), width, flags, ps);
  760.                
  761.                 if (retval < 0) {
  762.                     counter = -counter;
  763.                     goto out;
  764.                 };
  765.                
  766.                 counter += retval;
  767.                 j = nxt;
  768.                 goto next_char;
  769.            
  770.             /*
  771.              * Integer values
  772.              */
  773.             case 'P':
  774.                 /* Pointer */
  775.                 flags |= __PRINTF_FLAG_BIGCHARS;
  776.             case 'p':
  777.                 flags |= __PRINTF_FLAG_PREFIX;
  778.                 base = 16;
  779.                 qualifier = PrintfQualifierPointer;
  780.                 break;
  781.             case 'b':
  782.                 base = 2;
  783.                 break;
  784.             case 'o':
  785.                 base = 8;
  786.                 break;
  787.             case 'd':
  788.             case 'i':
  789.                 flags |= __PRINTF_FLAG_SIGNED;
  790.             case 'u':
  791.                 break;
  792.             case 'X':
  793.                 flags |= __PRINTF_FLAG_BIGCHARS;
  794.             case 'x':
  795.                 base = 16;
  796.                 break;
  797.            
  798.             /* Percentile itself */
  799.             case '%':
  800.                 j = i;
  801.                 goto next_char;
  802.            
  803.             /*
  804.              * Bad formatting.
  805.              */
  806.             default:
  807.                 /*
  808.                  * Unknown format. Now, j is the index of '%'
  809.                  * so we will print whole bad format sequence.
  810.                  */
  811.                 goto next_char;
  812.             }
  813.            
  814.             /* Print integers */
  815.             size_t size;
  816.             uint64_t number;
  817.             switch (qualifier) {
  818.             case PrintfQualifierByte:
  819.                 size = sizeof(unsigned char);
  820.                 number = (uint64_t) va_arg(ap, unsigned int);
  821.                 break;
  822.             case PrintfQualifierShort:
  823.                 size = sizeof(unsigned short);
  824.                 number = (uint64_t) va_arg(ap, unsigned int);
  825.                 break;
  826.             case PrintfQualifierInt:
  827.                 size = sizeof(unsigned int);
  828.                 number = (uint64_t) va_arg(ap, unsigned int);
  829.                 break;
  830.             case PrintfQualifierLong:
  831.                 size = sizeof(unsigned long);
  832.                 number = (uint64_t) va_arg(ap, unsigned long);
  833.                 break;
  834.             case PrintfQualifierLongLong:
  835.                 size = sizeof(unsigned long long);
  836.                 number = (uint64_t) va_arg(ap, unsigned long long);
  837.                 break;
  838.             case PrintfQualifierPointer:
  839.                 size = sizeof(void *);
  840.                 number = (uint64_t) (unsigned long) va_arg(ap, void *);
  841.                 break;
  842.             default:
  843.                 /* Unknown qualifier */
  844.                 counter = -counter;
  845.                 goto out;
  846.             }
  847.            
  848.             if (flags & __PRINTF_FLAG_SIGNED) {
  849.                 if (number & (0x1 << (size * 8 - 1))) {
  850.                     flags |= __PRINTF_FLAG_NEGATIVE;
  851.                    
  852.                     if (size == sizeof(uint64_t)) {
  853.                         number = -((int64_t) number);
  854.                     } else {
  855.                         number = ~number;
  856.                         number &=
  857.                             ~(0xFFFFFFFFFFFFFFFFll <<
  858.                             (size * 8));
  859.                         number++;
  860.                     }
  861.                 }
  862.             }
  863.            
  864.             if ((retval = print_number(number, width, precision,
  865.                 base, flags, ps)) < 0) {
  866.                 counter = -counter;
  867.                 goto out;
  868.             }
  869.            
  870.             counter += retval;
  871.             j = nxt;
  872.         }
  873. next_char:
  874.         ;
  875.     }
  876.    
  877.     if (i > j) {
  878.         if ((retval = printf_putnchars(&fmt[j], i - j, ps)) < 0) {
  879.             /* Error */
  880.             counter = -counter;
  881.             goto out;
  882.         }
  883.         counter += retval;
  884.     }
  885.    
  886. out:
  887.     return ((int) counter);
  888. }
  889.  
  890. /** @}
  891.  */
  892.