WebSVN – HelenOS-historic – Diff – /uspace/trunk/libc/generic/io/printf_core.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * Copyright (C) 2006 Josef Cejka
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file    print.c
 * @brief   Printing functions.
 */
 
#include <unistd.h>
#include <stdio.h>
#include <io/printf_core.h>
#include <ctype.h>
#include <string.h>
 
#define __PRINTF_FLAG_PREFIX        0x00000001  /**< show prefixes 0x or 0*/
#define __PRINTF_FLAG_SIGNED        0x00000002  /**< signed / unsigned number */
#define __PRINTF_FLAG_ZEROPADDED    0x00000004  /**< print leading zeroes */
#define __PRINTF_FLAG_LEFTALIGNED   0x00000010  /**< align to left */
#define __PRINTF_FLAG_SHOWPLUS      0x00000020  /**< always show + sign */
#define __PRINTF_FLAG_SPACESIGN     0x00000040  /**< print space instead of plus */
#define __PRINTF_FLAG_BIGCHARS      0x00000080  /**< show big characters */
#define __PRINTF_FLAG_NEGATIVE      0x00000100  /**< number has - sign */
 
#define PRINT_NUMBER_BUFFER_SIZE    (64+5)      /**< Buffer big enought for 64 bit number
                             * printed in base 2, sign, prefix and
                             * 0 to terminate string.. (last one is only for better testing
                             * end of buffer by zero-filling subroutine)
                             */
/** Enumeration of possible arguments types.
 */
typedef enum {
    PrintfQualifierByte = 0,
    PrintfQualifierShort,
    PrintfQualifierInt,
    PrintfQualifierLong,
    PrintfQualifierLongLong,
    PrintfQualifierSizeT,
    PrintfQualifierPointer
} qualifier_t;
 
static char digits_small[] = "0123456789abcdef";    /**< Small hexadecimal characters */
static char digits_big[] = "0123456789ABCDEF";      /**< Big hexadecimal characters */
 
/** Print count chars from buffer without adding newline
 * @param buf Buffer with size at least count bytes - NULL pointer NOT allowed!
 * @param count
 * @param ps output method and its data
 * @return 0 on success, EOF on fail
 */
static int printf_putnchars(const char * buf, size_t count, struct printf_spec *ps)
{
    if (ps->write((void *)buf, count, ps->data) == count) {
        return 0;
    }
   
    return EOF;
}
 
/** Print string without added newline
 * @param str string to print
 * @param ps write function specification and support data
 * @return 0 on success or EOF on fail
 */
static int printf_putstr(const char * str, struct printf_spec *ps)
{
    size_t count;
   
    if (str == NULL) {
        return printf_putnchars("(NULL)", 6, ps);
    }
 
    for (count = 0; str[count] != 0; count++);
 
    if (ps->write((void *) str, count, ps->data) == count) {
        return 0;
    }
   
    return EOF;
}
 
/** Print one character to output
 * @param c one character
 * @param ps output method
 * @return printed character or EOF
 */
static int printf_putchar(int c, struct printf_spec *ps)
{
    unsigned char ch = c;
   
    if (ps->write((void *) &ch, 1, ps->data) == 1) {
        return c;
    }
   
    return EOF;
}
 
/** Print one formatted character
 * @param c character to print
 * @param width
 * @param flags
 * @return number of printed characters or EOF
 */
static int print_char(char c, int width, uint64_t flags, struct printf_spec *ps)
{
    int counter = 0;
   
    if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
        while (--width > 0) {   /* one space is consumed by character itself hence predecrement */
            /* FIXME: painful slow */
            printf_putchar(' ', ps);   
            ++counter;
        }
    }
   
    if (printf_putchar(c, ps) == EOF) {
        return EOF;
    }
 
    while (--width > 0) { /* one space is consumed by character itself hence predecrement */
        printf_putchar(' ', ps);
        ++counter;
    }
   
    return ++counter;
}
 
/** Print one string
 * @param s string
 * @param width
 * @param precision
 * @param flags
 * @return number of printed characters or EOF
 */
                       
static int print_string(char *s, int width, int precision, uint64_t flags, struct printf_spec *ps)
{
    int counter = 0;
    size_t size;
 
    if (s == NULL) {
        return printf_putstr("(NULL)", ps);
    }
   
    size = strlen(s);
 
    /* print leading spaces */
 
    if (precision == 0)
        precision = size;
 
    width -= precision;
   
    if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
        while (width-- > 0) {  
            printf_putchar(' ', ps);   
            counter++;
        }
    }
 
    while (precision > size) {
        precision--;
        printf_putchar(' ', ps);   
        ++counter;
    }
   
    if (printf_putnchars(s, precision, ps) == EOF) {
        return EOF;
    }
 
    counter += precision;
 
    while (width-- > 0) {
        printf_putchar(' ', ps);   
        ++counter;
    }
   
    return ++counter;
}
 
 
/** Print number in given base
 *
 * Print significant digits of a number in given
 * base.
 *
 * @param num  Number to print.
 * @param width
 * @param precision
 * @param base Base to print the number in (should
 *             be in range 2 .. 16).
 * @param flags output modifiers
 * @return number of written characters or EOF
 *
 */
static int print_number(uint64_t num, int width, int precision, int base , uint64_t flags, struct printf_spec *ps)
{
    char *digits = digits_small;
    char d[PRINT_NUMBER_BUFFER_SIZE];   /* this is good enough even for base == 2, prefix and sign */
    char *ptr = &d[PRINT_NUMBER_BUFFER_SIZE - 1];
    int size = 0; /* size of number with all prefixes and signs */
    int number_size; /* size of plain number */
    int written = 0;
    char sgn;
   
    if (flags & __PRINTF_FLAG_BIGCHARS)
        digits = digits_big;   
   
    *ptr-- = 0; /* Put zero at end of string */
 
    if (num == 0) {
        *ptr-- = '0';
        size++;
    } else {
        do {
            *ptr-- = digits[num % base];
            size++;
        } while (num /= base);
    }
   
    number_size = size;
 
    /* Collect sum of all prefixes/signs/... to calculate padding and leading zeroes */
    if (flags & __PRINTF_FLAG_PREFIX) {
        switch(base) {
            case 2: /* Binary formating is not standard, but usefull */
                size += 2;
                break;
            case 8:
                size++;
                break;
            case 16:
                size += 2;
                break;
        }
    }
 
    sgn = 0;
    if (flags & __PRINTF_FLAG_SIGNED) {
        if (flags & __PRINTF_FLAG_NEGATIVE) {
            sgn = '-';
            size++;
        } else if (flags & __PRINTF_FLAG_SHOWPLUS) {
                sgn = '+';
                size++;
            } else if (flags & __PRINTF_FLAG_SPACESIGN) {
                    sgn = ' ';
                    size++;
                }
    }
 
    if (flags & __PRINTF_FLAG_LEFTALIGNED) {
        flags &= ~__PRINTF_FLAG_ZEROPADDED;
    }
 
    /* if number is leftaligned or precision is specified then zeropadding is ignored */
    if (flags & __PRINTF_FLAG_ZEROPADDED) {
        if ((precision == 0) && (width > size)) {
            precision = width - size + number_size;
        }
    }
 
    /* print leading spaces */
    if (number_size > precision) /* We must print whole number not only a part */
        precision = number_size;
 
    width -= precision + size - number_size;
   
    if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
        while (width-- > 0) {  
            printf_putchar(' ', ps);   
            written++;
        }
    }
   
    /* print sign */
    if (sgn) {
        printf_putchar(sgn, ps);
        written++;
    }
   
    /* print prefix */
   
    if (flags & __PRINTF_FLAG_PREFIX) {
        switch(base) {
            case 2: /* Binary formating is not standard, but usefull */
                printf_putchar('0', ps);
                if (flags & __PRINTF_FLAG_BIGCHARS) {
                    printf_putchar('B', ps);
                } else {
                    printf_putchar('b', ps);
                }
                written += 2;
                break;
            case 8:
                printf_putchar('o', ps);
                written++;
                break;
            case 16:
                printf_putchar('0', ps);
                if (flags & __PRINTF_FLAG_BIGCHARS) {
                    printf_putchar('X', ps);
                } else {
                    printf_putchar('x', ps);
                }
                written += 2;
                break;
        }
    }
 
    /* print leading zeroes */
    precision -= number_size;
    while (precision-- > 0) {  
        printf_putchar('0', ps);   
        written++;
    }
 
   
    /* print number itself */
 
    written += printf_putstr(++ptr, ps);
   
    /* print ending spaces */
   
    while (width-- > 0) {  
        printf_putchar(' ', ps);   
        written++;
    }
 
    return written;
}
 
 
/** Print formatted string.
 *
 * Print string formatted according to the fmt parameter
 * and variadic arguments. Each formatting directive
 * must have the following form:
 *
 *  \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
 *
 * FLAGS:@n
 *  - "#" Force to print prefix.
 *  For conversion \%o the prefix is 0, for %x and \%X prefixes are 0x and 0X
 *  and for conversion \%b the prefix is 0b.
 *
 *  - "-"   Align to left.
 *
 *  - "+"   Print positive sign just as negative.
 *
 *  - " "   If the printed number is positive and "+" flag is not set, print space in
 *  place of sign.
 *
 *  - "0"   Print 0 as padding instead of spaces. Zeroes are placed between sign and the
 *  rest of the number. This flag is ignored if "-" flag is specified.
 *
 * WIDTH:@n
 *  - Specify minimal width of printed argument. If it is bigger, width is ignored.
 * If width is specified with a "*" character instead of number, width is taken from
 * parameter list. And integer parameter is expected before parameter for processed
 * conversion specification. If this value is negative its absolute value is taken
 * and the "-" flag is set.
 *
 * PRECISION:@n
 *  - Value precision. For numbers it specifies minimum valid numbers.
 * Smaller numbers are printed with leading zeroes. Bigger numbers are not affected.
 * Strings with more than precision characters are cut off.
 * Just as with width, an "*" can be used used instead of a number.
 * An integer value is then expected in parameters. When both width and precision
 * are specified using "*", the first parameter is used for width and the second one
 * for precision.
 *
 * TYPE:@n
 *  - "hh"  Signed or unsigned char.@n
 *  - "h"   Signed or usigned short.@n
 *  - ""    Signed or usigned int (default value).@n
 *  - "l"   Signed or usigned long int.@n
 *  - "ll"  Signed or usigned long long int.@n
 *  - "z"   Type size_t.@n
 *
 *
 * CONVERSION:@n
 *  - % Print percentile character itself.
 *
 *  - c Print single character.
 *
 *  - s Print zero terminated string. If a NULL value is passed as value, "(NULL)" is printed instead.
 *
 *  - P, p  Print value of a pointer. Void * value is expected and it is printed in hexadecimal notation with prefix
 *  (as with \%#X or \%#x for 32bit or \%#X / \%#x for 64bit long pointers).
 *
 *  - b Print value as unsigned binary number. Prefix is not printed by default. (Nonstandard extension.)
 *
 *  - o Print value as unsigned octal number. Prefix is not printed by default.
 *
 *  - d,i   Print signed decimal number. There is no difference between d and i conversion.
 *
 *  - u Print unsigned decimal number.
 *
 *  - X, x  Print hexadecimal number with upper- or lower-case. Prefix is not printed by default.
 *
 * All other characters from fmt except the formatting directives
 * are printed in verbatim.
 *
 * @param fmt Formatting NULL terminated string.
 * @return Number of printed characters or negative value on failure.
 */
int printf_core(const char *fmt, struct printf_spec *ps, va_list ap)
{
    int i = 0, j = 0; /* i is index of currently processed char from fmt, j is index to the first not printed nonformating character */
    int end;
    int counter; /* counter of printed characters */
    int retval; /* used to store return values from called functions */
    char c;
    qualifier_t qualifier;  /* type of argument */
    int base;   /* base in which will be parameter (numbers only) printed */
    uint64_t number; /* argument value */
    size_t  size; /* byte size of integer parameter */
    int width, precision;
    uint64_t flags;
   
    counter = 0;
   
    while ((c = fmt[i])) {
        /* control character */
        if (c == '%' ) {
            /* print common characters if any processed */ 
            if (i > j) {
                if ((retval = printf_putnchars(&fmt[j], (size_t)(i - j), ps)) == EOF) { /* error */
                    return -counter;
                }
                counter += retval;
            }
       
            j = i;
            /* parse modifiers */
            flags = 0;
            end = 0;
           
            do {
                ++i;
                switch (c = fmt[i]) {
                    case '#': flags |= __PRINTF_FLAG_PREFIX; break;
                    case '-': flags |= __PRINTF_FLAG_LEFTALIGNED; break;
                    case '+': flags |= __PRINTF_FLAG_SHOWPLUS; break;
                    case ' ': flags |= __PRINTF_FLAG_SPACESIGN; break;
                    case '0': flags |= __PRINTF_FLAG_ZEROPADDED; break;
                    default: end = 1;
                }; 
               
            } while (end == 0);
           
            /* width & '*' operator */
            width = 0;
            if (isdigit(fmt[i])) {
                while (isdigit(fmt[i])) {
                    width *= 10;
                    width += fmt[i++] - '0';
                }
            } else if (fmt[i] == '*') {
                /* get width value from argument list*/
                i++;
                width = (int)va_arg(ap, int);
                if (width < 0) {
                    /* negative width means to set '-' flag */
                    width *= -1;
                    flags |= __PRINTF_FLAG_LEFTALIGNED;
                }
            }
           
            /* precision and '*' operator */   
            precision = 0;
            if (fmt[i] == '.') {
                ++i;
                if (isdigit(fmt[i])) {
                    while (isdigit(fmt[i])) {
                        precision *= 10;
                        precision += fmt[i++] - '0';
                    }
                } else if (fmt[i] == '*') {
                    /* get precision value from argument list*/
                    i++;
                    precision = (int)va_arg(ap, int);
                    if (precision < 0) {
                        /* negative precision means to ignore it */
                        precision = 0;
                    }
                }
            }
 
            switch (fmt[i++]) {
                /** TODO: unimplemented qualifiers:
                 * t ptrdiff_t - ISO C 99
                 */
                case 'h':   /* char or short */
                    qualifier = PrintfQualifierShort;
                    if (fmt[i] == 'h') {
                        i++;
                        qualifier = PrintfQualifierByte;
                    }
                    break;
                case 'l':   /* long or long long*/
                    qualifier = PrintfQualifierLong;
                    if (fmt[i] == 'l') {
                        i++;
                        qualifier = PrintfQualifierLongLong;
                    }
                    break;
                case 'z':   /* size_t */
                    qualifier = PrintfQualifierSizeT;
                    break;
                default:
                    qualifier = PrintfQualifierInt; /* default type */
                    --i;
            }  
           
            base = 10;
 
            switch (c = fmt[i]) {
 
                /*
                * String and character conversions.
                */
                case 's':
                    if ((retval = print_string(va_arg(ap, char*), width, precision, flags, ps)) == EOF) {
                        return -counter;
                    };
                   
                    counter += retval;
                    j = i + 1;
                    goto next_char;
                case 'c':
                    c = va_arg(ap, unsigned int);
                    if ((retval = print_char(c, width, flags, ps)) == EOF) {
                        return -counter;
                    };
                   
                    counter += retval;
                    j = i + 1;
                    goto next_char;
 
                /*
                 * Integer values
                */
                case 'P': /* pointer */
                        flags |= __PRINTF_FLAG_BIGCHARS;
                case 'p':
                    flags |= __PRINTF_FLAG_PREFIX;
                    base = 16;
                    qualifier = PrintfQualifierPointer;
                    break; 
                case 'b':
                    base = 2;
                    break;
                case 'o':
                    base = 8;
                    break;
                case 'd':
                case 'i':
                    flags |= __PRINTF_FLAG_SIGNED;  
                case 'u':
                    break;
                case 'X':
                    flags |= __PRINTF_FLAG_BIGCHARS;
                case 'x':
                    base = 16;
                    break;
                /* percentile itself */
                case '%':
                    j = i;
                    goto next_char;
                /*
                * Bad formatting.
                */
                default:
                    /* Unknown format
                     *  now, the j is index of '%' so we will
                     * print whole bad format sequence
                     */
                    goto next_char;    
            }
       
       
        /* Print integers */
            /* print number */
            switch (qualifier) {
                case PrintfQualifierByte:
                    size = sizeof(unsigned char);
                    number = (uint64_t)va_arg(ap, unsigned int);
                    break;
                case PrintfQualifierShort:
                    size = sizeof(unsigned short);
                    number = (uint64_t)va_arg(ap, unsigned int);
                    break;
                case PrintfQualifierInt:
                    size = sizeof(unsigned int);
                    number = (uint64_t)va_arg(ap, unsigned int);
                    break;
                case PrintfQualifierLong:
                    size = sizeof(unsigned long);
                    number = (uint64_t)va_arg(ap, unsigned long);
                    break;
                case PrintfQualifierLongLong:
                    size = sizeof(unsigned long long);
                    number = (uint64_t)va_arg(ap, unsigned long long);
                    break;
                case PrintfQualifierPointer:
                    size = sizeof(void *);
                    number = (uint64_t)(unsigned long)va_arg(ap, void *);
                    break;
                case PrintfQualifierSizeT:
                    size = sizeof(size_t);
                    number = (uint64_t)va_arg(ap, size_t);
                    break;
                default: /* Unknown qualifier */
                    return -counter;
                   
            }
           
            if (flags & __PRINTF_FLAG_SIGNED) {
                if (number & (0x1 << (size*8 - 1))) {
                    flags |= __PRINTF_FLAG_NEGATIVE;
               
                    if (size == sizeof(uint64_t)) {
                        number = -((int64_t)number);
                    } else {
                        number = ~number;
                        number &= (~((0xFFFFFFFFFFFFFFFFll) <<  (size * 8)));
                        number++;
                    }
                }
            }
 
            if ((retval = print_number(number, width, precision, base, flags, ps)) == EOF ) {
                return -counter;
            };
 
            counter += retval;
            j = i + 1;
        }  
next_char:
           
        ++i;
    }
   
    if (i > j) {
        if ((retval = printf_putnchars(&fmt[j], (size_t)(i - j), ps)) == EOF) { /* error */
            return -counter;
        }
        counter += retval;
    }
   
    return counter;
}
 
 

Rev 1272	Rev 1444
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* Copyright (C) 2006 Josef Cejka	3	* Copyright (C) 2006 Josef Cejka
4	* All rights reserved.	4	* All rights reserved.
5	*	5	*
6	* Redistribution and use in source and binary forms, with or without	6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions	7	* modification, are permitted provided that the following conditions
8	* are met:	8	* are met:
9	*	9	*
10	* - Redistributions of source code must retain the above copyright	10	* - Redistributions of source code must retain the above copyright
11	* notice, this list of conditions and the following disclaimer.	11	* notice, this list of conditions and the following disclaimer.
12	* - Redistributions in binary form must reproduce the above copyright	12	* - Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the	13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the distribution.	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	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.	16	* derived from this software without specific prior written permission.
17	*	17	*
18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	28	*/
29		29
30	/**	30	/**
31	* @file print.c	31	* @file print.c
32	* @brief Printing functions.	32	* @brief Printing functions.
33	*/	33	*/
34		34
35	#include <unistd.h>	35	#include <unistd.h>
36	#include <stdio.h>	36	#include <stdio.h>
37	#include <io/printf_core.h>	37	#include <io/printf_core.h>
38	#include <ctype.h>	38	#include <ctype.h>
39	#include <string.h>	39	#include <string.h>
40		40
41	#define __PRINTF_FLAG_PREFIX 0x00000001 /*< show prefixes 0x or 0/	41	#define __PRINTF_FLAG_PREFIX 0x00000001 /*< show prefixes 0x or 0/
42	#define __PRINTF_FLAG_SIGNED 0x00000002 /*< signed / unsigned number /	42	#define __PRINTF_FLAG_SIGNED 0x00000002 /*< signed / unsigned number /
43	#define __PRINTF_FLAG_ZEROPADDED 0x00000004 /*< print leading zeroes /	43	#define __PRINTF_FLAG_ZEROPADDED 0x00000004 /*< print leading zeroes /
44	#define __PRINTF_FLAG_LEFTALIGNED 0x00000010 /*< align to left /	44	#define __PRINTF_FLAG_LEFTALIGNED 0x00000010 /*< align to left /
45	#define __PRINTF_FLAG_SHOWPLUS 0x00000020 /*< always show + sign /	45	#define __PRINTF_FLAG_SHOWPLUS 0x00000020 /*< always show + sign /
46	#define __PRINTF_FLAG_SPACESIGN 0x00000040 /*< print space instead of plus /	46	#define __PRINTF_FLAG_SPACESIGN 0x00000040 /*< print space instead of plus /
47	#define __PRINTF_FLAG_BIGCHARS 0x00000080 /*< show big characters /	47	#define __PRINTF_FLAG_BIGCHARS 0x00000080 /*< show big characters /
48	#define __PRINTF_FLAG_NEGATIVE 0x00000100 /*< number has - sign /	48	#define __PRINTF_FLAG_NEGATIVE 0x00000100 /*< number has - sign /
49		49
50	#define PRINT_NUMBER_BUFFER_SIZE (64+5) /**< Buffer big enought for 64 bit number	50	#define PRINT_NUMBER_BUFFER_SIZE (64+5) /**< Buffer big enought for 64 bit number
51	* printed in base 2, sign, prefix and	51	* printed in base 2, sign, prefix and
52	* 0 to terminate string.. (last one is only for better testing	52	* 0 to terminate string.. (last one is only for better testing
53	* end of buffer by zero-filling subroutine)	53	* end of buffer by zero-filling subroutine)
54	*/	54	*/
55	/** Enumeration of possible arguments types.	55	/** Enumeration of possible arguments types.
56	*/	56	*/
57	typedef enum {	57	typedef enum {
58	PrintfQualifierByte = 0,	58	PrintfQualifierByte = 0,
59	PrintfQualifierShort,	59	PrintfQualifierShort,
60	PrintfQualifierInt,	60	PrintfQualifierInt,
61	PrintfQualifierLong,	61	PrintfQualifierLong,
62	PrintfQualifierLongLong,	62	PrintfQualifierLongLong,
63	PrintfQualifierSizeT,	63	PrintfQualifierSizeT,
64	PrintfQualifierPointer	64	PrintfQualifierPointer
65	} qualifier_t;	65	} qualifier_t;
66		66
67	static char digits_small[] = "0123456789abcdef"; /*< Small hexadecimal characters /	67	static char digits_small[] = "0123456789abcdef"; /*< Small hexadecimal characters /
68	static char digits_big[] = "0123456789ABCDEF"; /*< Big hexadecimal characters /	68	static char digits_big[] = "0123456789ABCDEF"; /*< Big hexadecimal characters /
69		69
70	/** Print count chars from buffer without adding newline	70	/** Print count chars from buffer without adding newline
71	* @param buf Buffer with size at least count bytes - NULL pointer NOT allowed!	71	* @param buf Buffer with size at least count bytes - NULL pointer NOT allowed!
72	* @param count	72	* @param count
73	* @param ps output method and its data	73	* @param ps output method and its data
74	* @return 0 on success, EOF on fail	74	* @return 0 on success, EOF on fail
75	*/	75	*/
76	static int printf_putnchars(const char * buf, size_t count, struct printf_spec *ps)	76	static int printf_putnchars(const char * buf, size_t count, struct printf_spec *ps)
77	{	77	{
78	if (ps->write((void *)buf, count, ps->data) == count) {	78	if (ps->write((void *)buf, count, ps->data) == count) {
79	return 0;	79	return 0;
80	}	80	}
81		81
82	return EOF;	82	return EOF;
83	}	83	}
84		84
85	/** Print string without added newline	85	/** Print string without added newline
86	* @param str string to print	86	* @param str string to print
87	* @param ps write function specification and support data	87	* @param ps write function specification and support data
88	* @return 0 on success or EOF on fail	88	* @return 0 on success or EOF on fail
89	*/	89	*/
90	static int printf_putstr(const char * str, struct printf_spec *ps)	90	static int printf_putstr(const char * str, struct printf_spec *ps)
91	{	91	{
92	size_t count;	92	size_t count;
93		93
94	if (str == NULL) {	94	if (str == NULL) {
95	return printf_putnchars("(NULL)", 6, ps);	95	return printf_putnchars("(NULL)", 6, ps);
96	}	96	}
97		97
98	for (count = 0; str[count] != 0; count++);	98	for (count = 0; str[count] != 0; count++);
99		99
100	if (ps->write((void *) str, count, ps->data) == count) {	100	if (ps->write((void *) str, count, ps->data) == count) {
101	return 0;	101	return 0;
102	}	102	}
103		103
104	return EOF;	104	return EOF;
105	}	105	}
106		106
107	/** Print one character to output	107	/** Print one character to output
108	* @param c one character	108	* @param c one character
109	* @param ps output method	109	* @param ps output method
110	* @return printed character or EOF	110	* @return printed character or EOF
111	*/	111	*/
112	static int printf_putchar(int c, struct printf_spec *ps)	112	static int printf_putchar(int c, struct printf_spec *ps)
113	{	113	{
114	unsigned char ch = c;	114	unsigned char ch = c;
115		115
116	if (ps->write((void *) &ch, 1, ps->data) == 1) {	116	if (ps->write((void *) &ch, 1, ps->data) == 1) {
117	return c;	117	return c;
118	}	118	}
119		119
120	return EOF;	120	return EOF;
121	}	121	}
122		122
123	/** Print one formatted character	123	/** Print one formatted character
124	* @param c character to print	124	* @param c character to print
125	* @param width	125	* @param width
126	* @param flags	126	* @param flags
127	* @return number of printed characters or EOF	127	* @return number of printed characters or EOF
128	*/	128	*/
129	static int print_char(char c, int width, uint64_t flags, struct printf_spec *ps)	129	static int print_char(char c, int width, uint64_t flags, struct printf_spec *ps)
130	{	130	{
131	int counter = 0;	131	int counter = 0;
132		132
133	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {	133	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
134	while (--width > 0) { /* one space is consumed by character itself hence predecrement */	134	while (--width > 0) { /* one space is consumed by character itself hence predecrement */
135	/* FIXME: painful slow */	135	/* FIXME: painful slow */
136	printf_putchar(' ', ps);	136	printf_putchar(' ', ps);
137	++counter;	137	++counter;
138	}	138	}
139	}	139	}
140		140
141	if (printf_putchar(c, ps) == EOF) {	141	if (printf_putchar(c, ps) == EOF) {
142	return EOF;	142	return EOF;
143	}	143	}
144		144
145	while (--width > 0) { /* one space is consumed by character itself hence predecrement */	145	while (--width > 0) { /* one space is consumed by character itself hence predecrement */
146	printf_putchar(' ', ps);	146	printf_putchar(' ', ps);
147	++counter;	147	++counter;
148	}	148	}
149		149
150	return ++counter;	150	return ++counter;
151	}	151	}
152		152
153	/** Print one string	153	/** Print one string
154	* @param s string	154	* @param s string
155	* @param width	155	* @param width
156	* @param precision	156	* @param precision
157	* @param flags	157	* @param flags
158	* @return number of printed characters or EOF	158	* @return number of printed characters or EOF
159	*/	159	*/
160		160
161	static int print_string(char s, int width, int precision, uint64_t flags, struct printf_spec ps)	161	static int print_string(char s, int width, int precision, uint64_t flags, struct printf_spec ps)
162	{	162	{
163	int counter = 0;	163	int counter = 0;
164	size_t size;	164	size_t size;
165		165
166	if (s == NULL) {	166	if (s == NULL) {
167	return printf_putstr("(NULL)", ps);	167	return printf_putstr("(NULL)", ps);
168	}	168	}
169		169
170	size = strlen(s);	170	size = strlen(s);
171		171
172	/* print leading spaces */	172	/* print leading spaces */
173		173
174	if (precision == 0)	174	if (precision == 0)
175	precision = size;	175	precision = size;
176		176
177	width -= precision;	177	width -= precision;
178		178
179	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {	179	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
180	while (width-- > 0) {	180	while (width-- > 0) {
181	printf_putchar(' ', ps);	181	printf_putchar(' ', ps);
182	counter++;	182	counter++;
183	}	183	}
184	}	184	}
185		185
186	while (precision > size) {	186	while (precision > size) {
187	precision--;	187	precision--;
188	printf_putchar(' ', ps);	188	printf_putchar(' ', ps);
189	++counter;	189	++counter;
190	}	190	}
191		191
192	if (printf_putnchars(s, precision, ps) == EOF) {	192	if (printf_putnchars(s, precision, ps) == EOF) {
193	return EOF;	193	return EOF;
194	}	194	}
195		195
196	counter += precision;	196	counter += precision;
197		197
198	while (width-- > 0) {	198	while (width-- > 0) {
199	printf_putchar(' ', ps);	199	printf_putchar(' ', ps);
200	++counter;	200	++counter;
201	}	201	}
202		202
203	return ++counter;	203	return ++counter;
204	}	204	}
205		205
206		206
207	/** Print number in given base	207	/** Print number in given base
208	*	208	*
209	* Print significant digits of a number in given	209	* Print significant digits of a number in given
210	* base.	210	* base.
211	*	211	*
212	* @param num Number to print.	212	* @param num Number to print.
213	* @param width	213	* @param width
214	* @param precision	214	* @param precision
215	* @param base Base to print the number in (should	215	* @param base Base to print the number in (should
216	* be in range 2 .. 16).	216	* be in range 2 .. 16).
217	* @param flags output modifiers	217	* @param flags output modifiers
218	* @return number of written characters or EOF	218	* @return number of written characters or EOF
219	*	219	*
220	*/	220	*/
221	static int print_number(uint64_t num, int width, int precision, int base , uint64_t flags, struct printf_spec *ps)	221	static int print_number(uint64_t num, int width, int precision, int base , uint64_t flags, struct printf_spec *ps)
222	{	222	{
223	char *digits = digits_small;	223	char *digits = digits_small;
224	char d[PRINT_NUMBER_BUFFER_SIZE]; /* this is good enough even for base == 2, prefix and sign */	224	char d[PRINT_NUMBER_BUFFER_SIZE]; /* this is good enough even for base == 2, prefix and sign */
225	char *ptr = &d[PRINT_NUMBER_BUFFER_SIZE - 1];	225	char *ptr = &d[PRINT_NUMBER_BUFFER_SIZE - 1];
226	int size = 0; /* size of number with all prefixes and signs */	226	int size = 0; /* size of number with all prefixes and signs */
227	int number_size; /* size of plain number */	227	int number_size; /* size of plain number */
228	int written = 0;	228	int written = 0;
229	char sgn;	229	char sgn;
230		230
231	if (flags & __PRINTF_FLAG_BIGCHARS)	231	if (flags & __PRINTF_FLAG_BIGCHARS)
232	digits = digits_big;	232	digits = digits_big;
233		233
234	ptr-- = 0; / Put zero at end of string */	234	ptr-- = 0; / Put zero at end of string */
235		235
236	if (num == 0) {	236	if (num == 0) {
237	*ptr-- = '0';	237	*ptr-- = '0';
238	size++;	238	size++;
239	} else {	239	} else {
240	do {	240	do {
241	*ptr-- = digits[num % base];	241	*ptr-- = digits[num % base];
242	size++;	242	size++;
243	} while (num /= base);	243	} while (num /= base);
244	}	244	}
245		245
246	number_size = size;	246	number_size = size;
247		247
248	/* Collect sum of all prefixes/signs/... to calculate padding and leading zeroes */	248	/* Collect sum of all prefixes/signs/... to calculate padding and leading zeroes */
249	if (flags & __PRINTF_FLAG_PREFIX) {	249	if (flags & __PRINTF_FLAG_PREFIX) {
250	switch(base) {	250	switch(base) {
251	case 2: /* Binary formating is not standard, but usefull */	251	case 2: /* Binary formating is not standard, but usefull */
252	size += 2;	252	size += 2;
253	break;	253	break;
254	case 8:	254	case 8:
255	size++;	255	size++;
256	break;	256	break;
257	case 16:	257	case 16:
258	size += 2;	258	size += 2;
259	break;	259	break;
260	}	260	}
261	}	261	}
262		262
263	sgn = 0;	263	sgn = 0;
264	if (flags & __PRINTF_FLAG_SIGNED) {	264	if (flags & __PRINTF_FLAG_SIGNED) {
265	if (flags & __PRINTF_FLAG_NEGATIVE) {	265	if (flags & __PRINTF_FLAG_NEGATIVE) {
266	sgn = '-';	266	sgn = '-';
267	size++;	267	size++;
268	} else if (flags & __PRINTF_FLAG_SHOWPLUS) {	268	} else if (flags & __PRINTF_FLAG_SHOWPLUS) {
269	sgn = '+';	269	sgn = '+';
270	size++;	270	size++;
271	} else if (flags & __PRINTF_FLAG_SPACESIGN) {	271	} else if (flags & __PRINTF_FLAG_SPACESIGN) {
272	sgn = ' ';	272	sgn = ' ';
273	size++;	273	size++;
274	}	274	}
275	}	275	}
276		276
277	if (flags & __PRINTF_FLAG_LEFTALIGNED) {	277	if (flags & __PRINTF_FLAG_LEFTALIGNED) {
278	flags &= ~__PRINTF_FLAG_ZEROPADDED;	278	flags &= ~__PRINTF_FLAG_ZEROPADDED;
279	}	279	}
280		280
281	/* if number is leftaligned or precision is specified then zeropadding is ignored */	281	/* if number is leftaligned or precision is specified then zeropadding is ignored */
282	if (flags & __PRINTF_FLAG_ZEROPADDED) {	282	if (flags & __PRINTF_FLAG_ZEROPADDED) {
283	if ((precision == 0) && (width > size)) {	283	if ((precision == 0) && (width > size)) {
284	precision = width - size + number_size;	284	precision = width - size + number_size;
285	}	285	}
286	}	286	}
287		287
288	/* print leading spaces */	288	/* print leading spaces */
289	if (number_size > precision) /* We must print whole number not only a part */	289	if (number_size > precision) /* We must print whole number not only a part */
290	precision = number_size;	290	precision = number_size;
291		291
292	width -= precision + size - number_size;	292	width -= precision + size - number_size;
293		293
294	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {	294	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
295	while (width-- > 0) {	295	while (width-- > 0) {
296	printf_putchar(' ', ps);	296	printf_putchar(' ', ps);
297	written++;	297	written++;
298	}	298	}
299	}	299	}
300		300
301	/* print sign */	301	/* print sign */
302	if (sgn) {	302	if (sgn) {
303	printf_putchar(sgn, ps);	303	printf_putchar(sgn, ps);
304	written++;	304	written++;
305	}	305	}
306		306
307	/* print prefix */	307	/* print prefix */
308		308
309	if (flags & __PRINTF_FLAG_PREFIX) {	309	if (flags & __PRINTF_FLAG_PREFIX) {
310	switch(base) {	310	switch(base) {
311	case 2: /* Binary formating is not standard, but usefull */	311	case 2: /* Binary formating is not standard, but usefull */
312	printf_putchar('0', ps);	312	printf_putchar('0', ps);
313	if (flags & __PRINTF_FLAG_BIGCHARS) {	313	if (flags & __PRINTF_FLAG_BIGCHARS) {
314	printf_putchar('B', ps);	314	printf_putchar('B', ps);
315	} else {	315	} else {
316	printf_putchar('b', ps);	316	printf_putchar('b', ps);
317	}	317	}
318	written += 2;	318	written += 2;
319	break;	319	break;
320	case 8:	320	case 8:
321	printf_putchar('o', ps);	321	printf_putchar('o', ps);
322	written++;	322	written++;
323	break;	323	break;
324	case 16:	324	case 16:
325	printf_putchar('0', ps);	325	printf_putchar('0', ps);
326	if (flags & __PRINTF_FLAG_BIGCHARS) {	326	if (flags & __PRINTF_FLAG_BIGCHARS) {
327	printf_putchar('X', ps);	327	printf_putchar('X', ps);
328	} else {	328	} else {
329	printf_putchar('x', ps);	329	printf_putchar('x', ps);
330	}	330	}
331	written += 2;	331	written += 2;
332	break;	332	break;
333	}	333	}
334	}	334	}
335		335
336	/* print leading zeroes */	336	/* print leading zeroes */
337	precision -= number_size;	337	precision -= number_size;
338	while (precision-- > 0) {	338	while (precision-- > 0) {
339	printf_putchar('0', ps);	339	printf_putchar('0', ps);
340	written++;	340	written++;
341	}	341	}
342		342
343		343
344	/* print number itself */	344	/* print number itself */
345		345
346	written += printf_putstr(++ptr, ps);	346	written += printf_putstr(++ptr, ps);
347		347
348	/* print ending spaces */	348	/* print ending spaces */
349		349
350	while (width-- > 0) {	350	while (width-- > 0) {
351	printf_putchar(' ', ps);	351	printf_putchar(' ', ps);
352	written++;	352	written++;
353	}	353	}
354		354
355	return written;	355	return written;
356	}	356	}
357		357
358		358
359	/** Print formatted string.	359	/** Print formatted string.
360	*	360	*
361	* Print string formatted according to the fmt parameter	361	* Print string formatted according to the fmt parameter
362	* and variadic arguments. Each formatting directive	362	* and variadic arguments. Each formatting directive
363	* must have the following form:	363	* must have the following form:
364	*	364	*
365	* \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION	365	* \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
366	*	366	*
367	* FLAGS:@n	367	* FLAGS:@n
368	* - "#" Force to print prefix.	368	* - "#" Force to print prefix.
369	* For conversion \%o the prefix is 0, for %x and \%X prefixes are 0x and 0X	369	* For conversion \%o the prefix is 0, for %x and \%X prefixes are 0x and 0X
370	* and for conversion \%b the prefix is 0b.	370	* and for conversion \%b the prefix is 0b.
371	*	371	*
372	* - "-" Align to left.	372	* - "-" Align to left.
373	*	373	*
374	* - "+" Print positive sign just as negative.	374	* - "+" Print positive sign just as negative.
375	*	375	*
376	* - " " If the printed number is positive and "+" flag is not set, print space in	376	* - " " If the printed number is positive and "+" flag is not set, print space in
377	* place of sign.	377	* place of sign.
378	*	378	*
379	* - "0" Print 0 as padding instead of spaces. Zeroes are placed between sign and the	379	* - "0" Print 0 as padding instead of spaces. Zeroes are placed between sign and the
380	* rest of the number. This flag is ignored if "-" flag is specified.	380	* rest of the number. This flag is ignored if "-" flag is specified.
381	*	381	*
382	* WIDTH:@n	382	* WIDTH:@n
383	* - Specify minimal width of printed argument. If it is bigger, width is ignored.	383	* - Specify minimal width of printed argument. If it is bigger, width is ignored.
384	* If width is specified with a "*" character instead of number, width is taken from	384	* If width is specified with a "*" character instead of number, width is taken from
385	* parameter list. And integer parameter is expected before parameter for processed	385	* parameter list. And integer parameter is expected before parameter for processed
386	* conversion specification. If this value is negative its absolute value is taken	386	* conversion specification. If this value is negative its absolute value is taken
387	* and the "-" flag is set.	387	* and the "-" flag is set.
388	*	388	*
389	* PRECISION:@n	389	* PRECISION:@n
390	* - Value precision. For numbers it specifies minimum valid numbers.	390	* - Value precision. For numbers it specifies minimum valid numbers.
391	* Smaller numbers are printed with leading zeroes. Bigger numbers are not affected.	391	* Smaller numbers are printed with leading zeroes. Bigger numbers are not affected.
392	* Strings with more than precision characters are cut off.	392	* Strings with more than precision characters are cut off.
393	* Just as with width, an "*" can be used used instead of a number.	393	* Just as with width, an "*" can be used used instead of a number.
394	* An integer value is then expected in parameters. When both width and precision	394	* An integer value is then expected in parameters. When both width and precision
395	* are specified using "*", the first parameter is used for width and the second one	395	* are specified using "*", the first parameter is used for width and the second one
396	* for precision.	396	* for precision.
397	*	397	*
398	* TYPE:@n	398	* TYPE:@n
399	* - "hh" Signed or unsigned char.@n	399	* - "hh" Signed or unsigned char.@n
400	* - "h" Signed or usigned short.@n	400	* - "h" Signed or usigned short.@n
401	* - "" Signed or usigned int (default value).@n	401	* - "" Signed or usigned int (default value).@n
402	* - "l" Signed or usigned long int.@n	402	* - "l" Signed or usigned long int.@n
403	* - "ll" Signed or usigned long long int.@n	403	* - "ll" Signed or usigned long long int.@n
404	* - "z" Type size_t.@n	404	* - "z" Type size_t.@n
405	*	405	*
406	*	406	*
407	* CONVERSION:@n	407	* CONVERSION:@n
408	* - % Print percentile character itself.	408	* - % Print percentile character itself.
409	*	409	*
410	* - c Print single character.	410	* - c Print single character.
411	*	411	*
412	* - s Print zero terminated string. If a NULL value is passed as value, "(NULL)" is printed instead.	412	* - s Print zero terminated string. If a NULL value is passed as value, "(NULL)" is printed instead.
413	*	413	*
414	* - P, p Print value of a pointer. Void * value is expected and it is printed in hexadecimal notation with prefix	414	* - P, p Print value of a pointer. Void * value is expected and it is printed in hexadecimal notation with prefix
415	* (as with \%#X or \%#x for 32bit or \%#X / \%#x for 64bit long pointers).	415	* (as with \%#X or \%#x for 32bit or \%#X / \%#x for 64bit long pointers).
416	*	416	*
417	* - b Print value as unsigned binary number. Prefix is not printed by default. (Nonstandard extension.)	417	* - b Print value as unsigned binary number. Prefix is not printed by default. (Nonstandard extension.)
418	*	418	*
419	* - o Print value as unsigned octal number. Prefix is not printed by default.	419	* - o Print value as unsigned octal number. Prefix is not printed by default.
420	*	420	*
421	* - d,i Print signed decimal number. There is no difference between d and i conversion.	421	* - d,i Print signed decimal number. There is no difference between d and i conversion.
422	*	422	*
423	* - u Print unsigned decimal number.	423	* - u Print unsigned decimal number.
424	*	424	*
425	* - X, x Print hexadecimal number with upper- or lower-case. Prefix is not printed by default.	425	* - X, x Print hexadecimal number with upper- or lower-case. Prefix is not printed by default.
426	*	426	*
427	* All other characters from fmt except the formatting directives	427	* All other characters from fmt except the formatting directives
428	* are printed in verbatim.	428	* are printed in verbatim.
429	*	429	*
430	* @param fmt Formatting NULL terminated string.	430	* @param fmt Formatting NULL terminated string.
431	* @return Number of printed characters or negative value on failure.	431	* @return Number of printed characters or negative value on failure.
432	*/	432	*/
433	int printf_core(const char fmt, struct printf_spec ps, va_list ap)	433	int printf_core(const char fmt, struct printf_spec ps, va_list ap)
434	{	434	{
435	int i = 0, j = 0; /*< i is index of currently processed char from fmt, j is index to the first not printed nonformating character /	435	int i = 0, j = 0; /* i is index of currently processed char from fmt, j is index to the first not printed nonformating character */
436	int end;	436	int end;
437	int counter; /*< counter of printed characters /	437	int counter; /* counter of printed characters */
438	int retval; /*< used to store return values from called functions /	438	int retval; /* used to store return values from called functions */
439	char c;	439	char c;
440	qualifier_t qualifier; /*< type of argument /	440	qualifier_t qualifier; /* type of argument */
441	int base; /*< base in which will be parameter (numbers only) printed /	441	int base; /* base in which will be parameter (numbers only) printed */
442	uint64_t number; /*< argument value /	442	uint64_t number; /* argument value */
443	size_t size; /*< byte size of integer parameter /	443	size_t size; /* byte size of integer parameter */
444	int width, precision;	444	int width, precision;
445	uint64_t flags;	445	uint64_t flags;
446		446
447	counter = 0;	447	counter = 0;
448		448
449	while ((c = fmt[i])) {	449	while ((c = fmt[i])) {
450	/* control character */	450	/* control character */
451	if (c == '%' ) {	451	if (c == '%' ) {
452	/* print common characters if any processed */	452	/* print common characters if any processed */
453	if (i > j) {	453	if (i > j) {
454	if ((retval = printf_putnchars(&fmt[j], (size_t)(i - j), ps)) == EOF) { /* error */	454	if ((retval = printf_putnchars(&fmt[j], (size_t)(i - j), ps)) == EOF) { /* error */
455	return -counter;	455	return -counter;
456	}	456	}
457	counter += retval;	457	counter += retval;
458	}	458	}
459		459
460	j = i;	460	j = i;
461	/* parse modifiers */	461	/* parse modifiers */
462	flags = 0;	462	flags = 0;
463	end = 0;	463	end = 0;
464		464
465	do {	465	do {
466	++i;	466	++i;
467	switch (c = fmt[i]) {	467	switch (c = fmt[i]) {
468	case '#': flags \|= __PRINTF_FLAG_PREFIX; break;	468	case '#': flags \|= __PRINTF_FLAG_PREFIX; break;
469	case '-': flags \|= __PRINTF_FLAG_LEFTALIGNED; break;	469	case '-': flags \|= __PRINTF_FLAG_LEFTALIGNED; break;
470	case '+': flags \|= __PRINTF_FLAG_SHOWPLUS; break;	470	case '+': flags \|= __PRINTF_FLAG_SHOWPLUS; break;
471	case ' ': flags \|= __PRINTF_FLAG_SPACESIGN; break;	471	case ' ': flags \|= __PRINTF_FLAG_SPACESIGN; break;
472	case '0': flags \|= __PRINTF_FLAG_ZEROPADDED; break;	472	case '0': flags \|= __PRINTF_FLAG_ZEROPADDED; break;
473	default: end = 1;	473	default: end = 1;
474	};	474	};
475		475
476	} while (end == 0);	476	} while (end == 0);
477		477
478	/* width & '' operator /	478	/* width & '' operator /
479	width = 0;	479	width = 0;
480	if (isdigit(fmt[i])) {	480	if (isdigit(fmt[i])) {
481	while (isdigit(fmt[i])) {	481	while (isdigit(fmt[i])) {
482	width *= 10;	482	width *= 10;
483	width += fmt[i++] - '0';	483	width += fmt[i++] - '0';
484	}	484	}
485	} else if (fmt[i] == '*') {	485	} else if (fmt[i] == '*') {
486	/* get width value from argument list*/	486	/* get width value from argument list*/
487	i++;	487	i++;
488	width = (int)va_arg(ap, int);	488	width = (int)va_arg(ap, int);
489	if (width < 0) {	489	if (width < 0) {
490	/* negative width means to set '-' flag */	490	/* negative width means to set '-' flag */
491	width *= -1;	491	width *= -1;
492	flags \|= __PRINTF_FLAG_LEFTALIGNED;	492	flags \|= __PRINTF_FLAG_LEFTALIGNED;
493	}	493	}
494	}	494	}
495		495
496	/* precision and '' operator /	496	/* precision and '' operator /
497	precision = 0;	497	precision = 0;
498	if (fmt[i] == '.') {	498	if (fmt[i] == '.') {
499	++i;	499	++i;
500	if (isdigit(fmt[i])) {	500	if (isdigit(fmt[i])) {

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(root)/uspace/trunk/libc/generic/io/printf_core.c @ 1272 – Rev 1272 → 1444