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