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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 UTF-8 characters without adding newline.
  86.  *
  87.  * @param buf  Buffer holding UTF-8 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 UTF-8 characters printed.
  93.  *
  94.  */
  95. static int printf_putnchars_utf8(const char *buf, size_t size,
  96.     printf_spec_t *ps)
  97. {
  98.     return ps->write_utf8((void *) buf, size, ps->data);
  99. }
  100.  
  101. /** Print one or more UTF-32 characters without adding newline.
  102.  *
  103.  * @param buf  Buffer holding UTF-32 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 UTF-32 characters printed.
  109.  *
  110.  */
  111. static int printf_putnchars_utf32(const wchar_t *buf, size_t size,
  112.     printf_spec_t *ps)
  113. {
  114.     return ps->write_utf32((void *) buf, size, ps->data);
  115. }
  116.  
  117. /** Print UTF-8 string without adding a newline.
  118.  *
  119.  * @param str UTF-8 string to print.
  120.  * @param ps  Write function specification and support data.
  121.  *
  122.  * @return Number of UTF-8 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_utf8(nullstr, strlen(nullstr), ps);
  129.    
  130.     return ps->write_utf8((void *) str, strlen(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->write_utf8((void *) &invalch, 1, ps->data);
  145.    
  146.     return ps->write_utf8(&ch, 1, ps->data);
  147. }
  148.  
  149. /** Print one UTF-32 character.
  150.  *
  151.  * @param c  UTF-32 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 (!unicode_check(ch))
  160.         return ps->write_utf8((void *) &invalch, 1, ps->data);
  161.    
  162.     return ps->write_utf32(&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 UTF-32 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 UTF-8 string.
  242.  *
  243.  * @param str       UTF-8 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 UTF-8 characters printed, negative value on failure.
  249.  */
  250. static int print_utf8(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.     size_t size = str_length(str);
  258.     if (precision == 0)
  259.         precision = size;
  260.  
  261.     count_t counter = 0;
  262.     width -= precision;
  263.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  264.         while (width-- > 0) {
  265.             if (printf_putchar(' ', ps) == 1)
  266.                 counter++;
  267.         }
  268.     }
  269.  
  270.     int retval;
  271.     size_t bytes = str_lsize(str, min(size, precision));
  272.     if ((retval = printf_putnchars_utf8(str, bytes, ps)) < 0)
  273.         return -counter;
  274.    
  275.     counter += retval;
  276.    
  277.     while (width-- > 0) {
  278.         if (printf_putchar(' ', ps) == 1)
  279.             counter++;
  280.     }
  281.  
  282.     return ((int) counter);
  283. }
  284.  
  285. /** Print UTF-32 string.
  286.  *
  287.  * @param str       UTF-32 string to be printed.
  288.  * @param width     Width modifier.
  289.  * @param precision Precision modifier.
  290.  * @param flags     Flags that modify the way the string is printed.
  291.  *
  292.  * @return Number of UTF-32 characters printed, negative value on failure.
  293.  */
  294. static int print_utf32(wchar_t *str, int width, unsigned int precision,
  295.     uint32_t flags, printf_spec_t *ps)
  296. {
  297.     if (str == NULL)
  298.         return printf_putstr(nullstr, ps);
  299.    
  300.     /* Print leading spaces */
  301.     size_t size = wstr_length(str);
  302.     if (precision == 0)
  303.         precision = size;
  304.    
  305.     count_t counter = 0;
  306.     width -= precision;
  307.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  308.         while (width-- > 0) {
  309.             if (printf_putchar(' ', ps) == 1)
  310.                 counter++;
  311.         }
  312.     }
  313.    
  314.     int retval;
  315.     size_t bytes = min(size, precision) * sizeof(wchar_t);
  316.     if ((retval = printf_putnchars_utf32(str, bytes, ps)) < 0)
  317.         return -counter;
  318.    
  319.     counter += retval;
  320.    
  321.     while (width-- > 0) {
  322.         if (printf_putchar(' ', ps) == 1)
  323.             counter++;
  324.     }
  325.    
  326.     return ((int) counter);
  327. }
  328.  
  329. /** Print a number in a given base.
  330.  *
  331.  * Print significant digits of a number in given base.
  332.  *
  333.  * @param num       Number to print.
  334.  * @param width     Width modifier.
  335.  * @param precision Precision modifier.
  336.  * @param base      Base to print the number in (must be between 2 and 16).
  337.  * @param flags     Flags that modify the way the number is printed.
  338.  *
  339.  * @return Number of characters printed.
  340.  *
  341.  */
  342. static int print_number(uint64_t num, int width, int precision, int base,
  343.     uint32_t flags, printf_spec_t *ps)
  344. {
  345.     char *digits;
  346.     if (flags & __PRINTF_FLAG_BIGCHARS)
  347.         digits = digits_big;
  348.     else
  349.         digits = digits_small;
  350.    
  351.     char data[PRINT_NUMBER_BUFFER_SIZE];
  352.     char *ptr = &data[PRINT_NUMBER_BUFFER_SIZE - 1];
  353.    
  354.     /* Size of number with all prefixes and signs */
  355.     int size = 0;
  356.    
  357.     /* Put zero at end of string */
  358.     *ptr-- = 0;
  359.    
  360.     if (num == 0) {
  361.         *ptr-- = '0';
  362.         size++;
  363.     } else {
  364.         do {
  365.             *ptr-- = digits[num % base];
  366.             size++;
  367.         } while (num /= base);
  368.     }
  369.    
  370.     /* Size of plain number */
  371.     int number_size = size;
  372.    
  373.     /*
  374.      * Collect the sum of all prefixes/signs/etc. to calculate padding and
  375.      * leading zeroes.
  376.      */
  377.     if (flags & __PRINTF_FLAG_PREFIX) {
  378.         switch(base) {
  379.         case 2:
  380.             /* Binary formating is not standard, but usefull */
  381.             size += 2;
  382.             break;
  383.         case 8:
  384.             size++;
  385.             break;
  386.         case 16:
  387.             size += 2;
  388.             break;
  389.         }
  390.     }
  391.    
  392.     char sgn = 0;
  393.     if (flags & __PRINTF_FLAG_SIGNED) {
  394.         if (flags & __PRINTF_FLAG_NEGATIVE) {
  395.             sgn = '-';
  396.             size++;
  397.         } else if (flags & __PRINTF_FLAG_SHOWPLUS) {
  398.             sgn = '+';
  399.             size++;
  400.         } else if (flags & __PRINTF_FLAG_SPACESIGN) {
  401.             sgn = ' ';
  402.             size++;
  403.         }
  404.     }
  405.    
  406.     if (flags & __PRINTF_FLAG_LEFTALIGNED)
  407.         flags &= ~__PRINTF_FLAG_ZEROPADDED;
  408.    
  409.     /*
  410.      * If the number is left-aligned or precision is specified then
  411.      * padding with zeros is ignored.
  412.      */
  413.     if (flags & __PRINTF_FLAG_ZEROPADDED) {
  414.         if ((precision == 0) && (width > size))
  415.             precision = width - size + number_size;
  416.     }
  417.    
  418.     /* Print leading spaces */
  419.     if (number_size > precision) {
  420.         /* Print the whole number, not only a part */
  421.         precision = number_size;
  422.     }
  423.    
  424.     width -= precision + size - number_size;
  425.     count_t counter = 0;
  426.    
  427.     if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
  428.         while (width-- > 0) {
  429.             if (printf_putchar(' ', ps) == 1)
  430.                 counter++;
  431.         }
  432.     }
  433.    
  434.     /* Print sign */
  435.     if (sgn) {
  436.         if (printf_putchar(sgn, ps) == 1)
  437.             counter++;
  438.     }
  439.    
  440.     /* Print prefix */
  441.     if (flags & __PRINTF_FLAG_PREFIX) {
  442.         switch(base) {
  443.         case 2:
  444.             /* Binary formating is not standard, but usefull */
  445.             if (printf_putchar('0', ps) == 1)
  446.                 counter++;
  447.             if (flags & __PRINTF_FLAG_BIGCHARS) {
  448.                 if (printf_putchar('B', ps) == 1)
  449.                     counter++;
  450.             } else {
  451.                 if (printf_putchar('b', ps) == 1)
  452.                     counter++;
  453.             }
  454.             break;
  455.         case 8:
  456.             if (printf_putchar('o', ps) == 1)
  457.                 counter++;
  458.             break;
  459.         case 16:
  460.             if (printf_putchar('0', ps) == 1)
  461.                 counter++;
  462.             if (flags & __PRINTF_FLAG_BIGCHARS) {
  463.                 if (printf_putchar('X', ps) == 1)
  464.                     counter++;
  465.             } else {
  466.                 if (printf_putchar('x', ps) == 1)
  467.                     counter++;
  468.             }
  469.             break;
  470.         }
  471.     }
  472.    
  473.     /* Print leading zeroes */
  474.     precision -= number_size;
  475.     while (precision-- > 0) {
  476.         if (printf_putchar('0', ps) == 1)
  477.             counter++;
  478.     }
  479.    
  480.     /* Print the number itself */
  481.     int retval;
  482.     if ((retval = printf_putstr(++ptr, ps)) > 0)
  483.         counter += retval;
  484.    
  485.     /* Print tailing spaces */
  486.    
  487.     while (width-- > 0) {
  488.         if (printf_putchar(' ', ps) == 1)
  489.             counter++;
  490.     }
  491.    
  492.     return ((int) counter);
  493. }
  494.  
  495. /** Print formatted string.
  496.  *
  497.  * Print string formatted according to the fmt parameter and variadic arguments.
  498.  * Each formatting directive must have the following form:
  499.  *
  500.  *  \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
  501.  *
  502.  * FLAGS:@n
  503.  *  - "#" Force to print prefix. For \%o conversion, the prefix is 0, for
  504.  *        \%x and \%X prefixes are 0x and 0X and for conversion \%b the
  505.  *        prefix is 0b.
  506.  *
  507.  *  - "-" Align to left.
  508.  *
  509.  *  - "+" Print positive sign just as negative.
  510.  *
  511.  *  - " " If the printed number is positive and "+" flag is not set,
  512.  *        print space in place of sign.
  513.  *
  514.  *  - "0" Print 0 as padding instead of spaces. Zeroes are placed between
  515.  *        sign and the rest of the number. This flag is ignored if "-"
  516.  *        flag is specified.
  517.  *
  518.  * WIDTH:@n
  519.  *  - Specify the minimal width of a printed argument. If it is bigger,
  520.  *    width is ignored. If width is specified with a "*" character instead of
  521.  *    number, width is taken from parameter list. And integer parameter is
  522.  *    expected before parameter for processed conversion specification. If
  523.  *    this value is negative its absolute value is taken and the "-" flag is
  524.  *    set.
  525.  *
  526.  * PRECISION:@n
  527.  *  - Value precision. For numbers it specifies minimum valid numbers.
  528.  *    Smaller numbers are printed with leading zeroes. Bigger numbers are not
  529.  *    affected. Strings with more than precision characters are cut off. Just
  530.  *    as with width, an "*" can be used used instead of a number. An integer
  531.  *    value is then expected in parameters. When both width and precision are
  532.  *    specified using "*", the first parameter is used for width and the
  533.  *    second one for precision.
  534.  *
  535.  * TYPE:@n
  536.  *  - "hh" Signed or unsigned char.@n
  537.  *  - "h"  Signed or unsigned short.@n
  538.  *  - ""   Signed or unsigned int (default value).@n
  539.  *  - "l"  Signed or unsigned long int.@n
  540.  *         If conversion is "c", the character is wchar_t (UTF-32).@n
  541.  *         If conversion is "s", the string is wchar_t * (UTF-32).@n
  542.  *  - "ll" Signed or unsigned long long int.@n
  543.  *
  544.  * CONVERSION:@n
  545.  *  - % Print percentile character itself.
  546.  *
  547.  *  - c Print single character. The character is expected to be plain
  548.  *      ASCII (e.g. only values 0 .. 127 are valid).@n
  549.  *      If type is "l", then the character is expected to be UTF-32
  550.  *      (e.g. values 0 .. 0x10ffff are valid).
  551.  *
  552.  *  - s Print zero terminated string. If a NULL value is passed as
  553.  *      value, "(NULL)" is printed instead.@n
  554.  *      The string is expected to be correctly encoded UTF-8 (or plain
  555.  *      ASCII, which is a subset of UTF-8).@n
  556.  *      If type is "l", then the string is expected to be correctly
  557.  *      encoded UTF-32.
  558.  *
  559.  *  - P, p Print value of a pointer. Void * value is expected and it is
  560.  *         printed in hexadecimal notation with prefix (as with \%#X / \%#x
  561.  *         for 32-bit or \%#X / \%#x for 64-bit long pointers).
  562.  *
  563.  *  - b Print value as unsigned binary number. Prefix is not printed by
  564.  *      default. (Nonstandard extension.)
  565.  *
  566.  *  - o Print value as unsigned octal number. Prefix is not printed by
  567.  *      default.
  568.  *
  569.  *  - d, i Print signed decimal number. There is no difference between d
  570.  *         and i conversion.
  571.  *
  572.  *  - u Print unsigned decimal number.
  573.  *
  574.  *  - X, x Print hexadecimal number with upper- or lower-case. Prefix is
  575.  *         not printed by default.
  576.  *
  577.  * All other characters from fmt except the formatting directives are printed in
  578.  * verbatim.
  579.  *
  580.  * @param fmt Formatting NULL terminated string (UTF-8 or plain ASCII).
  581.  *
  582.  * @return Number of UTF-8 characters printed, negative value on failure.
  583.  *
  584.  */
  585. int printf_core(const char *fmt, printf_spec_t *ps, va_list ap)
  586. {
  587.     index_t i = 0;  /* Index of the currently processed character from fmt */
  588.     index_t nxt = 0;
  589.     index_t j = 0;  /* Index to the first not printed nonformating character */
  590.    
  591.     wchar_t uc;           /* Current UTF-32 character decoded from fmt */
  592.     count_t counter = 0;  /* Number of UTF-8 characters printed */
  593.     int retval;           /* Return values from nested functions */
  594.    
  595.     while (true) {
  596.         i = nxt;
  597.         uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  598.  
  599.         if (uc == '\0') break;
  600.  
  601.         /* Control character */
  602.         if (uc == '%') {
  603.             /* Print common characters if any processed */
  604.             if (i > j) {
  605.                 if ((retval = printf_putnchars_utf8(&fmt[j], i - j, ps)) < 0) {
  606.                     /* Error */
  607.                     counter = -counter;
  608.                     goto out;
  609.                 }
  610.                 counter += retval;
  611.             }
  612.            
  613.             j = i;
  614.            
  615.             /* Parse modifiers */
  616.             uint32_t flags = 0;
  617.             bool end = false;
  618.            
  619.             do {
  620.                 i = nxt;
  621.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  622.                 switch (uc) {
  623.                 case '#':
  624.                     flags |= __PRINTF_FLAG_PREFIX;
  625.                     break;
  626.                 case '-':
  627.                     flags |= __PRINTF_FLAG_LEFTALIGNED;
  628.                     break;
  629.                 case '+':
  630.                     flags |= __PRINTF_FLAG_SHOWPLUS;
  631.                     break;
  632.                 case ' ':
  633.                     flags |= __PRINTF_FLAG_SPACESIGN;
  634.                     break;
  635.                 case '0':
  636.                     flags |= __PRINTF_FLAG_ZEROPADDED;
  637.                     break;
  638.                 default:
  639.                     end = true;
  640.                 };
  641.             } while (!end);
  642.            
  643.             /* Width & '*' operator */
  644.             int width = 0;
  645.             if (isdigit(uc)) {
  646.                 while (true) {
  647.                     width *= 10;
  648.                     width += uc - '0';
  649.  
  650.                     i = nxt;
  651.                     uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  652.                     if (uc == '\0')
  653.                         break;
  654.                     if (!isdigit(uc))
  655.                         break;
  656.                 }
  657.             } else if (uc == '*') {
  658.                 /* Get width value from argument list */
  659.                 i = nxt;
  660.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  661.                 width = (int) va_arg(ap, int);
  662.                 if (width < 0) {
  663.                     /* Negative width sets '-' flag */
  664.                     width *= -1;
  665.                     flags |= __PRINTF_FLAG_LEFTALIGNED;
  666.                 }
  667.             }
  668.            
  669.             /* Precision and '*' operator */
  670.             int precision = 0;
  671.             if (uc == '.') {
  672.                 i = nxt;
  673.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  674.                 if (isdigit(uc)) {
  675.                     while (true) {
  676.                         precision *= 10;
  677.                         precision += uc - '0';
  678.  
  679.                         i = nxt;
  680.                         uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  681.                         if (uc == '\0')
  682.                             break;
  683.                         if (!isdigit(uc))
  684.                             break;
  685.                     }
  686.                 } else if (uc == '*') {
  687.                     /* Get precision value from the argument list */
  688.                     i = nxt;
  689.                     uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  690.                     precision = (int) va_arg(ap, int);
  691.                     if (precision < 0) {
  692.                         /* Ignore negative precision */
  693.                         precision = 0;
  694.                     }
  695.                 }
  696.             }
  697.            
  698.             qualifier_t qualifier;
  699.            
  700.             switch (uc) {
  701.             /** @todo Unimplemented qualifiers:
  702.              *        t ptrdiff_t - ISO C 99
  703.              */
  704.             case 'h':
  705.                 /* Char or short */
  706.                 qualifier = PrintfQualifierShort;
  707.                 i = nxt;
  708.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  709.                 if (uc == 'h') {
  710.                     i = nxt;
  711.                     uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  712.                     qualifier = PrintfQualifierByte;
  713.                 }
  714.                 break;
  715.             case 'l':
  716.                 /* Long or long long */
  717.                 qualifier = PrintfQualifierLong;
  718.                 i = nxt;
  719.                 uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  720.                 if (uc == 'l') {
  721.                     i = nxt;
  722.                     uc = chr_decode(fmt, &nxt, UTF8_NO_LIMIT);
  723.                     qualifier = PrintfQualifierLongLong;
  724.                 }
  725.                 break;
  726.             default:
  727.                 /* Default type */
  728.                 qualifier = PrintfQualifierInt;
  729.             }
  730.            
  731.             unsigned int base = 10;
  732.            
  733.             switch (uc) {
  734.             /*
  735.              * String and character conversions.
  736.              */
  737.             case 's':
  738.                 if (qualifier == PrintfQualifierLong)
  739.                     retval = print_utf32(va_arg(ap, wchar_t *), width, precision, flags, ps);
  740.                 else
  741.                     retval = print_utf8(va_arg(ap, char *), width, precision, flags, ps);
  742.                
  743.                 if (retval < 0) {
  744.                     counter = -counter;
  745.                     goto out;
  746.                 }
  747.                
  748.                 counter += retval;
  749.                 j = nxt;
  750.                 goto next_char;
  751.             case 'c':
  752.                 if (qualifier == PrintfQualifierLong)
  753.                     retval = print_wchar(va_arg(ap, wchar_t), width, flags, ps);
  754.                 else
  755.                     retval = print_char(va_arg(ap, unsigned int), width, flags, ps);
  756.                
  757.                 if (retval < 0) {
  758.                     counter = -counter;
  759.                     goto out;
  760.                 };
  761.                
  762.                 counter += retval;
  763.                 j = nxt;
  764.                 goto next_char;
  765.            
  766.             /*
  767.              * Integer values
  768.              */
  769.             case 'P':
  770.                 /* Pointer */
  771.                 flags |= __PRINTF_FLAG_BIGCHARS;
  772.             case 'p':
  773.                 flags |= __PRINTF_FLAG_PREFIX;
  774.                 base = 16;
  775.                 qualifier = PrintfQualifierPointer;
  776.                 break;
  777.             case 'b':
  778.                 base = 2;
  779.                 break;
  780.             case 'o':
  781.                 base = 8;
  782.                 break;
  783.             case 'd':
  784.             case 'i':
  785.                 flags |= __PRINTF_FLAG_SIGNED;
  786.             case 'u':
  787.                 break;
  788.             case 'X':
  789.                 flags |= __PRINTF_FLAG_BIGCHARS;
  790.             case 'x':
  791.                 base = 16;
  792.                 break;
  793.            
  794.             /* Percentile itself */
  795.             case '%':
  796.                 j = i;
  797.                 goto next_char;
  798.            
  799.             /*
  800.              * Bad formatting.
  801.              */
  802.             default:
  803.                 /*
  804.                  * Unknown format. Now, j is the index of '%'
  805.                  * so we will print whole bad format sequence.
  806.                  */
  807.                 goto next_char;
  808.             }
  809.            
  810.             /* Print integers */
  811.             size_t size;
  812.             uint64_t number;
  813.             switch (qualifier) {
  814.             case PrintfQualifierByte:
  815.                 size = sizeof(unsigned char);
  816.                 number = (uint64_t) va_arg(ap, unsigned int);
  817.                 break;
  818.             case PrintfQualifierShort:
  819.                 size = sizeof(unsigned short);
  820.                 number = (uint64_t) va_arg(ap, unsigned int);
  821.                 break;
  822.             case PrintfQualifierInt:
  823.                 size = sizeof(unsigned int);
  824.                 number = (uint64_t) va_arg(ap, unsigned int);
  825.                 break;
  826.             case PrintfQualifierLong:
  827.                 size = sizeof(unsigned long);
  828.                 number = (uint64_t) va_arg(ap, unsigned long);
  829.                 break;
  830.             case PrintfQualifierLongLong:
  831.                 size = sizeof(unsigned long long);
  832.                 number = (uint64_t) va_arg(ap, unsigned long long);
  833.                 break;
  834.             case PrintfQualifierPointer:
  835.                 size = sizeof(void *);
  836.                 number = (uint64_t) (unsigned long) va_arg(ap, void *);
  837.                 break;
  838.             default:
  839.                 /* Unknown qualifier */
  840.                 counter = -counter;
  841.                 goto out;
  842.             }
  843.            
  844.             if (flags & __PRINTF_FLAG_SIGNED) {
  845.                 if (number & (0x1 << (size * 8 - 1))) {
  846.                     flags |= __PRINTF_FLAG_NEGATIVE;
  847.                    
  848.                     if (size == sizeof(uint64_t)) {
  849.                         number = -((int64_t) number);
  850.                     } else {
  851.                         number = ~number;
  852.                         number &=
  853.                             ~(0xFFFFFFFFFFFFFFFFll <<
  854.                             (size * 8));
  855.                         number++;
  856.                     }
  857.                 }
  858.             }
  859.            
  860.             if ((retval = print_number(number, width, precision,
  861.                 base, flags, ps)) < 0) {
  862.                 counter = -counter;
  863.                 goto out;
  864.             }
  865.            
  866.             counter += retval;
  867.             j = nxt;
  868.         }
  869. next_char:
  870.         ;
  871.     }
  872.    
  873.     if (i > j) {
  874.         if ((retval = printf_putnchars_utf8(&fmt[j], i - j, ps)) < 0) {
  875.             /* Error */
  876.             counter = -counter;
  877.             goto out;
  878.         }
  879.         counter += retval;
  880.     }
  881.    
  882. out:
  883.     return ((int) counter);
  884. }
  885.  
  886. /** @}
  887.  */
  888.