WebSVN – HelenOS – Diff – /tags/0.2.0.5/uspace/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.
 */
 
/** @addtogroup libc
 * @{
 */
/**
 * @file
 * @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 number of printed characters
 */
static int printf_putnchars(const char * buf, size_t count, struct printf_spec *ps)
{
    return ps->write((void *)buf, count, ps->data);
}
 
/** Print string without added newline
 * @param str string to print
 * @param ps write function specification and support data
 * @return number of printed characters
 */
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 number of printed characters
 */
static int printf_putchar(int c, struct printf_spec *ps)
{
    unsigned char ch = c;
   
    return ps->write((void *) &ch, 1, ps->data);
}
 
/** Print one formatted character
 * @param c character to print
 * @param width
 * @param flags
 * @return number of printed characters
 */
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 */
            if (printf_putchar(' ', ps) > 0)   
                ++counter;
        }
    }
   
    if (printf_putchar(c, ps) > 0)
        counter++;
   
    while (--width > 0) { /* one space is consumed by character itself hence predecrement */
        if (printf_putchar(' ', ps) > 0)
            ++counter;
    }
   
    return ++counter;
}
 
/** Print one string
 * @param s string
 * @param width
 * @param precision
 * @param flags
 * @return number of printed characters
 */
                       
static int print_string(char *s, int width, int precision, uint64_t flags, struct printf_spec *ps)
{
    int counter = 0;
    size_t size;
    int retval;
 
    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) {  
            if (printf_putchar(' ', ps) == 1)  
                counter++;
        }
    }
 
    while (precision > size) {
        precision--;
        if (printf_putchar(' ', ps) == 1)  
            ++counter;
    }
   
    if ((retval = printf_putnchars(s, precision, ps)) < 0) {
        return -counter;
    }
 
    counter += retval; 
 
    while (width-- > 0) {
        if (printf_putchar(' ', ps) == 1)  
            ++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 printed characters
 *
 */
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 */
    char sgn;
    int retval;
    int counter = 0;
   
    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) {  
            if (printf_putchar(' ', ps) == 1)  
                counter++;
        }
    }
   
    /* print sign */
    if (sgn) {
        if (printf_putchar(sgn, ps) == 1)
            counter++;
    }
   
    /* print prefix */
   
    if (flags & __PRINTF_FLAG_PREFIX) {
        switch(base) {
        case 2: /* Binary formating is not standard, but usefull */
            if (printf_putchar('0', ps) == 1)
                counter++;
            if (flags & __PRINTF_FLAG_BIGCHARS) {
                if (printf_putchar('B', ps) == 1)
                    counter++;
            } else {
                if (printf_putchar('b', ps) == 1)
                    counter++;
            }
            break;
        case 8:
            if (printf_putchar('o', ps) == 1)
                counter++;
            break;
        case 16:
            if (printf_putchar('0', ps) == 1)
                counter++;
            if (flags & __PRINTF_FLAG_BIGCHARS) {
                if (printf_putchar('X', ps) == 1)
                    counter++;
            } else {
                if (printf_putchar('x', ps) == 1)
                    counter++;
            }
            break;
        }
    }
 
    /* print leading zeroes */
    precision -= number_size;
    while (precision-- > 0) {  
        if (printf_putchar('0', ps) == 1)
            counter++;
    }
 
   
    /* print number itself */
 
    if ((retval = printf_putstr(++ptr, ps)) > 0) {
        counter += retval;
    }
   
    /* print ending spaces */
   
    while (width-- > 0) {  
        if (printf_putchar(' ', ps) == 1)  
            counter++;
    }
 
    return counter;
}
 
 
/** 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' or '\%#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)) < 0) { /* error */
                    goto minus_out;
                }
                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)) < 0) {
                    goto minus_out;
                }
                   
                counter += retval;
                j = i + 1;
                goto next_char;
            case 'c':
                c = va_arg(ap, unsigned int);
                if ((retval = print_char(c, width, flags, ps)) < 0) {
                    goto minus_out;
                }
 
                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 */
                goto minus_out;
                   
            }
           
            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)) < 0 ) {
                goto minus_out;
            };
 
            counter += retval;
            j = i + 1;
        }  
next_char:
           
        ++i;
    }
   
    if (i > j) {
        if ((retval = printf_putnchars(&fmt[j], (size_t)(i - j), ps)) < 0) { /* error */
            goto minus_out;
        }
        counter += retval;
    }
   
    return counter;
minus_out:
    return -counter;
}
 
/** @}
 */
 

Rev 2230	Rev 2474
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	/** @addtogroup libc	30	/** @addtogroup libc
31	* @{	31	* @{
32	*/	32	*/
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Printing functions.	35	* @brief Printing functions.
36	*/	36	*/
37		37
38	#include <unistd.h>	38	#include <unistd.h>
39	#include <stdio.h>	39	#include <stdio.h>
40	#include <io/printf_core.h>	40	#include <io/printf_core.h>
41	#include <ctype.h>	41	#include <ctype.h>
42	#include <string.h>	42	#include <string.h>
43		43
44	#define __PRINTF_FLAG_PREFIX 0x00000001 /*< show prefixes 0x or 0/	44	#define __PRINTF_FLAG_PREFIX 0x00000001 /*< show prefixes 0x or 0/
45	#define __PRINTF_FLAG_SIGNED 0x00000002 /*< signed / unsigned number /	45	#define __PRINTF_FLAG_SIGNED 0x00000002 /*< signed / unsigned number /
46	#define __PRINTF_FLAG_ZEROPADDED 0x00000004 /*< print leading zeroes /	46	#define __PRINTF_FLAG_ZEROPADDED 0x00000004 /*< print leading zeroes /
47	#define __PRINTF_FLAG_LEFTALIGNED 0x00000010 /*< align to left /	47	#define __PRINTF_FLAG_LEFTALIGNED 0x00000010 /*< align to left /
48	#define __PRINTF_FLAG_SHOWPLUS 0x00000020 /*< always show + sign /	48	#define __PRINTF_FLAG_SHOWPLUS 0x00000020 /*< always show + sign /
49	#define __PRINTF_FLAG_SPACESIGN 0x00000040 /*< print space instead of plus /	49	#define __PRINTF_FLAG_SPACESIGN 0x00000040 /*< print space instead of plus /
50	#define __PRINTF_FLAG_BIGCHARS 0x00000080 /*< show big characters /	50	#define __PRINTF_FLAG_BIGCHARS 0x00000080 /*< show big characters /
51	#define __PRINTF_FLAG_NEGATIVE 0x00000100 /*< number has - sign /	51	#define __PRINTF_FLAG_NEGATIVE 0x00000100 /*< number has - sign /
52		52
53	#define PRINT_NUMBER_BUFFER_SIZE (64+5) /**< Buffer big enought for 64 bit number	53	#define PRINT_NUMBER_BUFFER_SIZE (64+5) /**< Buffer big enought for 64 bit number
54	* printed in base 2, sign, prefix and	54	* printed in base 2, sign, prefix and
55	* 0 to terminate string.. (last one is only for better testing	55	* 0 to terminate string.. (last one is only for better testing
56	* end of buffer by zero-filling subroutine)	56	* end of buffer by zero-filling subroutine)
57	*/	57	*/
58	/** Enumeration of possible arguments types.	58	/** Enumeration of possible arguments types.
59	*/	59	*/
60	typedef enum {	60	typedef enum {
61	PrintfQualifierByte = 0,	61	PrintfQualifierByte = 0,
62	PrintfQualifierShort,	62	PrintfQualifierShort,
63	PrintfQualifierInt,	63	PrintfQualifierInt,
64	PrintfQualifierLong,	64	PrintfQualifierLong,
65	PrintfQualifierLongLong,	65	PrintfQualifierLongLong,
66	PrintfQualifierSizeT,	66	PrintfQualifierSizeT,
67	PrintfQualifierPointer	67	PrintfQualifierPointer
68	} qualifier_t;	68	} qualifier_t;
69		69
70	static char digits_small[] = "0123456789abcdef"; /*< Small hexadecimal characters /	70	static char digits_small[] = "0123456789abcdef"; /*< Small hexadecimal characters /
71	static char digits_big[] = "0123456789ABCDEF"; /*< Big hexadecimal characters /	71	static char digits_big[] = "0123456789ABCDEF"; /*< Big hexadecimal characters /
72		72
73	/** Print count chars from buffer without adding newline	73	/** Print count chars from buffer without adding newline
74	* @param buf Buffer with size at least count bytes - NULL pointer NOT allowed!	74	* @param buf Buffer with size at least count bytes - NULL pointer NOT allowed!
75	* @param count	75	* @param count
76	* @param ps output method and its data	76	* @param ps output method and its data
77	* @return number of printed characters	77	* @return number of printed characters
78	*/	78	*/
79	static int printf_putnchars(const char * buf, size_t count, struct printf_spec *ps)	79	static int printf_putnchars(const char * buf, size_t count, struct printf_spec *ps)
80	{	80	{
81	return ps->write((void *)buf, count, ps->data);	81	return ps->write((void *)buf, count, ps->data);
82	}	82	}
83		83
84	/** Print string without added newline	84	/** Print string without added newline
85	* @param str string to print	85	* @param str string to print
86	* @param ps write function specification and support data	86	* @param ps write function specification and support data
87	* @return number of printed characters	87	* @return number of printed characters
88	*/	88	*/
89	static int printf_putstr(const char * str, struct printf_spec *ps)	89	static int printf_putstr(const char * str, struct printf_spec *ps)
90	{	90	{
91	size_t count;	91	size_t count;
92		92
93	if (str == NULL)	93	if (str == NULL)
94	return printf_putnchars("(NULL)", 6, ps);	94	return printf_putnchars("(NULL)", 6, ps);
95		95
96	for (count = 0; str[count] != 0; count++);	96	for (count = 0; str[count] != 0; count++);
97		97
98	if (ps->write((void *) str, count, ps->data) == count)	98	if (ps->write((void *) str, count, ps->data) == count)
99	return 0;	99	return 0;
100		100
101	return EOF;	101	return EOF;
102	}	102	}
103		103
104	/** Print one character to output	104	/** Print one character to output
105	* @param c one character	105	* @param c one character
106	* @param ps output method	106	* @param ps output method
107	* @return number of printed characters	107	* @return number of printed characters
108	*/	108	*/
109	static int printf_putchar(int c, struct printf_spec *ps)	109	static int printf_putchar(int c, struct printf_spec *ps)
110	{	110	{
111	unsigned char ch = c;	111	unsigned char ch = c;
112		112
113	return ps->write((void *) &ch, 1, ps->data);	113	return ps->write((void *) &ch, 1, ps->data);
114	}	114	}
115		115
116	/** Print one formatted character	116	/** Print one formatted character
117	* @param c character to print	117	* @param c character to print
118	* @param width	118	* @param width
119	* @param flags	119	* @param flags
120	* @return number of printed characters	120	* @return number of printed characters
121	*/	121	*/
122	static int print_char(char c, int width, uint64_t flags, struct printf_spec *ps)	122	static int print_char(char c, int width, uint64_t flags, struct printf_spec *ps)
123	{	123	{
124	int counter = 0;	124	int counter = 0;
125		125
126	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {	126	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
127	while (--width > 0) { /* one space is consumed by character itself hence predecrement */	127	while (--width > 0) { /* one space is consumed by character itself hence predecrement */
128	if (printf_putchar(' ', ps) > 0)	128	if (printf_putchar(' ', ps) > 0)
129	++counter;	129	++counter;
130	}	130	}
131	}	131	}
132		132
133	if (printf_putchar(c, ps) > 0)	133	if (printf_putchar(c, ps) > 0)
134	counter++;	134	counter++;
135		135
136	while (--width > 0) { /* one space is consumed by character itself hence predecrement */	136	while (--width > 0) { /* one space is consumed by character itself hence predecrement */
137	if (printf_putchar(' ', ps) > 0)	137	if (printf_putchar(' ', ps) > 0)
138	++counter;	138	++counter;
139	}	139	}
140		140
141	return ++counter;	141	return ++counter;
142	}	142	}
143		143
144	/** Print one string	144	/** Print one string
145	* @param s string	145	* @param s string
146	* @param width	146	* @param width
147	* @param precision	147	* @param precision
148	* @param flags	148	* @param flags
149	* @return number of printed characters	149	* @return number of printed characters
150	*/	150	*/
151		151
152	static int print_string(char s, int width, int precision, uint64_t flags, struct printf_spec ps)	152	static int print_string(char s, int width, int precision, uint64_t flags, struct printf_spec ps)
153	{	153	{
154	int counter = 0;	154	int counter = 0;
155	size_t size;	155	size_t size;
156	int retval;	156	int retval;
157		157
158	if (s == NULL) {	158	if (s == NULL) {
159	return printf_putstr("(NULL)", ps);	159	return printf_putstr("(NULL)", ps);
160	}	160	}
161		161
162	size = strlen(s);	162	size = strlen(s);
163		163
164	/* print leading spaces */	164	/* print leading spaces */
165		165
166	if (precision == 0)	166	if (precision == 0)
167	precision = size;	167	precision = size;
168		168
169	width -= precision;	169	width -= precision;
170		170
171	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {	171	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
172	while (width-- > 0) {	172	while (width-- > 0) {
173	if (printf_putchar(' ', ps) == 1)	173	if (printf_putchar(' ', ps) == 1)
174	counter++;	174	counter++;
175	}	175	}
176	}	176	}
177		177
178	while (precision > size) {	178	while (precision > size) {
179	precision--;	179	precision--;
180	if (printf_putchar(' ', ps) == 1)	180	if (printf_putchar(' ', ps) == 1)
181	++counter;	181	++counter;
182	}	182	}
183		183
184	if ((retval = printf_putnchars(s, precision, ps)) < 0) {	184	if ((retval = printf_putnchars(s, precision, ps)) < 0) {
185	return -counter;	185	return -counter;
186	}	186	}
187		187
188	counter += retval;	188	counter += retval;
189		189
190	while (width-- > 0) {	190	while (width-- > 0) {
191	if (printf_putchar(' ', ps) == 1)	191	if (printf_putchar(' ', ps) == 1)
192	++counter;	192	++counter;
193	}	193	}
194		194
195	return counter;	195	return counter;
196	}	196	}
197		197
198		198
199	/** Print number in given base	199	/** Print number in given base
200	*	200	*
201	* Print significant digits of a number in given	201	* Print significant digits of a number in given
202	* base.	202	* base.
203	*	203	*
204	* @param num Number to print.	204	* @param num Number to print.
205	* @param width	205	* @param width
206	* @param precision	206	* @param precision
207	* @param base Base to print the number in (should	207	* @param base Base to print the number in (should
208	* be in range 2 .. 16).	208	* be in range 2 .. 16).
209	* @param flags output modifiers	209	* @param flags output modifiers
210	* @return number of printed characters	210	* @return number of printed characters
211	*	211	*
212	*/	212	*/
213	static int print_number(uint64_t num, int width, int precision, int base , uint64_t flags, struct printf_spec *ps)	213	static int print_number(uint64_t num, int width, int precision, int base , uint64_t flags, struct printf_spec *ps)
214	{	214	{
215	char *digits = digits_small;	215	char *digits = digits_small;
216	char d[PRINT_NUMBER_BUFFER_SIZE]; /* this is good enough even for base == 2, prefix and sign */	216	char d[PRINT_NUMBER_BUFFER_SIZE]; /* this is good enough even for base == 2, prefix and sign */
217	char *ptr = &d[PRINT_NUMBER_BUFFER_SIZE - 1];	217	char *ptr = &d[PRINT_NUMBER_BUFFER_SIZE - 1];
218	int size = 0; /* size of number with all prefixes and signs */	218	int size = 0; /* size of number with all prefixes and signs */
219	int number_size; /* size of plain number */	219	int number_size; /* size of plain number */
220	char sgn;	220	char sgn;
221	int retval;	221	int retval;
222	int counter = 0;	222	int counter = 0;
223		223
224	if (flags & __PRINTF_FLAG_BIGCHARS)	224	if (flags & __PRINTF_FLAG_BIGCHARS)
225	digits = digits_big;	225	digits = digits_big;
226		226
227	ptr-- = 0; / Put zero at end of string */	227	ptr-- = 0; / Put zero at end of string */
228		228
229	if (num == 0) {	229	if (num == 0) {
230	*ptr-- = '0';	230	*ptr-- = '0';
231	size++;	231	size++;
232	} else {	232	} else {
233	do {	233	do {
234	*ptr-- = digits[num % base];	234	*ptr-- = digits[num % base];
235	size++;	235	size++;
236	} while (num /= base);	236	} while (num /= base);
237	}	237	}
238		238
239	number_size = size;	239	number_size = size;
240		240
241	/* Collect sum of all prefixes/signs/... to calculate padding and leading zeroes */	241	/* Collect sum of all prefixes/signs/... to calculate padding and leading zeroes */
242	if (flags & __PRINTF_FLAG_PREFIX) {	242	if (flags & __PRINTF_FLAG_PREFIX) {
243	switch(base) {	243	switch(base) {
244	case 2: /* Binary formating is not standard, but usefull */	244	case 2: /* Binary formating is not standard, but usefull */
245	size += 2;	245	size += 2;
246	break;	246	break;
247	case 8:	247	case 8:
248	size++;	248	size++;
249	break;	249	break;
250	case 16:	250	case 16:
251	size += 2;	251	size += 2;
252	break;	252	break;
253	}	253	}
254	}	254	}
255		255
256	sgn = 0;	256	sgn = 0;
257	if (flags & __PRINTF_FLAG_SIGNED) {	257	if (flags & __PRINTF_FLAG_SIGNED) {
258	if (flags & __PRINTF_FLAG_NEGATIVE) {	258	if (flags & __PRINTF_FLAG_NEGATIVE) {
259	sgn = '-';	259	sgn = '-';
260	size++;	260	size++;
261	} else if (flags & __PRINTF_FLAG_SHOWPLUS) {	261	} else if (flags & __PRINTF_FLAG_SHOWPLUS) {
262	sgn = '+';	262	sgn = '+';
263	size++;	263	size++;
264	} else if (flags & __PRINTF_FLAG_SPACESIGN) {	264	} else if (flags & __PRINTF_FLAG_SPACESIGN) {
265	sgn = ' ';	265	sgn = ' ';
266	size++;	266	size++;
267	}	267	}
268	}	268	}
269		269
270	if (flags & __PRINTF_FLAG_LEFTALIGNED) {	270	if (flags & __PRINTF_FLAG_LEFTALIGNED) {
271	flags &= ~__PRINTF_FLAG_ZEROPADDED;	271	flags &= ~__PRINTF_FLAG_ZEROPADDED;
272	}	272	}
273		273
274	/* if number is leftaligned or precision is specified then zeropadding is ignored */	274	/* if number is leftaligned or precision is specified then zeropadding is ignored */
275	if (flags & __PRINTF_FLAG_ZEROPADDED) {	275	if (flags & __PRINTF_FLAG_ZEROPADDED) {
276	if ((precision == 0) && (width > size)) {	276	if ((precision == 0) && (width > size)) {
277	precision = width - size + number_size;	277	precision = width - size + number_size;
278	}	278	}
279	}	279	}
280		280
281	/* print leading spaces */	281	/* print leading spaces */
282	if (number_size > precision) /* We must print whole number not only a part */	282	if (number_size > precision) /* We must print whole number not only a part */
283	precision = number_size;	283	precision = number_size;
284		284
285	width -= precision + size - number_size;	285	width -= precision + size - number_size;
286		286
287	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {	287	if (!(flags & __PRINTF_FLAG_LEFTALIGNED)) {
288	while (width-- > 0) {	288	while (width-- > 0) {
289	if (printf_putchar(' ', ps) == 1)	289	if (printf_putchar(' ', ps) == 1)
290	counter++;	290	counter++;
291	}	291	}
292	}	292	}
293		293
294	/* print sign */	294	/* print sign */
295	if (sgn) {	295	if (sgn) {
296	if (printf_putchar(sgn, ps) == 1)	296	if (printf_putchar(sgn, ps) == 1)
297	counter++;	297	counter++;
298	}	298	}
299		299
300	/* print prefix */	300	/* print prefix */
301		301
302	if (flags & __PRINTF_FLAG_PREFIX) {	302	if (flags & __PRINTF_FLAG_PREFIX) {
303	switch(base) {	303	switch(base) {
304	case 2: /* Binary formating is not standard, but usefull */	304	case 2: /* Binary formating is not standard, but usefull */
305	if (printf_putchar('0', ps) == 1)	305	if (printf_putchar('0', ps) == 1)
306	counter++;	306	counter++;
307	if (flags & __PRINTF_FLAG_BIGCHARS) {	307	if (flags & __PRINTF_FLAG_BIGCHARS) {
308	if (printf_putchar('B', ps) == 1)	308	if (printf_putchar('B', ps) == 1)
309	counter++;	309	counter++;
310	} else {	310	} else {
311	if (printf_putchar('b', ps) == 1)	311	if (printf_putchar('b', ps) == 1)
312	counter++;	312	counter++;
313	}	313	}
314	break;	314	break;
315	case 8:	315	case 8:
316	if (printf_putchar('o', ps) == 1)	316	if (printf_putchar('o', ps) == 1)
317	counter++;	317	counter++;
318	break;	318	break;
319	case 16:	319	case 16:
320	if (printf_putchar('0', ps) == 1)	320	if (printf_putchar('0', ps) == 1)
321	counter++;	321	counter++;
322	if (flags & __PRINTF_FLAG_BIGCHARS) {	322	if (flags & __PRINTF_FLAG_BIGCHARS) {
323	if (printf_putchar('X', ps) == 1)	323	if (printf_putchar('X', ps) == 1)
324	counter++;	324	counter++;
325	} else {	325	} else {
326	if (printf_putchar('x', ps) == 1)	326	if (printf_putchar('x', ps) == 1)
327	counter++;	327	counter++;
328	}	328	}
329	break;	329	break;
330	}	330	}
331	}	331	}
332		332
333	/* print leading zeroes */	333	/* print leading zeroes */
334	precision -= number_size;	334	precision -= number_size;
335	while (precision-- > 0) {	335	while (precision-- > 0) {
336	if (printf_putchar('0', ps) == 1)	336	if (printf_putchar('0', ps) == 1)
337	counter++;	337	counter++;
338	}	338	}
339		339
340		340
341	/* print number itself */	341	/* print number itself */
342		342
343	if ((retval = printf_putstr(++ptr, ps)) > 0) {	343	if ((retval = printf_putstr(++ptr, ps)) > 0) {
344	counter += retval;	344	counter += retval;
345	}	345	}
346		346
347	/* print ending spaces */	347	/* print ending spaces */
348		348
349	while (width-- > 0) {	349	while (width-- > 0) {
350	if (printf_putchar(' ', ps) == 1)	350	if (printf_putchar(' ', ps) == 1)
351	counter++;	351	counter++;
352	}	352	}
353		353
354	return counter;	354	return counter;
355	}	355	}
356		356
357		357
358	/** Print formatted string.	358	/** Print formatted string.
359	*	359	*
360	* Print string formatted according to the fmt parameter	360	* Print string formatted according to the fmt parameter
361	* and variadic arguments. Each formatting directive	361	* and variadic arguments. Each formatting directive
362	* must have the following form:	362	* must have the following form:
363	*	363	*
364	* \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION	364	* \% [ FLAGS ] [ WIDTH ] [ .PRECISION ] [ TYPE ] CONVERSION
365	*	365	*
366	* FLAGS:@n	366	* FLAGS:@n
367	* - "#" Force to print prefix.	367	* - "#" Force to print prefix.
368	* For conversion \%o the prefix is 0, for %x and \%X prefixes are 0x and 0X	368	* For conversion \%o the prefix is 0, for %x and \%X prefixes are 0x and 0X
369	* and for conversion \%b the prefix is 0b.	369	* and for conversion \%b the prefix is 0b.
370	*	370	*
371	* - "-" Align to left.	371	* - "-" Align to left.
372	*	372	*
373	* - "+" Print positive sign just as negative.	373	* - "+" Print positive sign just as negative.
374	*	374	*
375	* - " " If the printed number is positive and "+" flag is not set, print space in	375	* - " " If the printed number is positive and "+" flag is not set, print space in
376	* place of sign.	376	* place of sign.
377	*	377	*
378	* - "0" Print 0 as padding instead of spaces. Zeroes are placed between sign and the	378	* - "0" Print 0 as padding instead of spaces. Zeroes are placed between sign and the
379	* rest of the number. This flag is ignored if "-" flag is specified.	379	* rest of the number. This flag is ignored if "-" flag is specified.
380	*	380	*
381	* WIDTH:@n	381	* WIDTH:@n
382	* - Specify minimal width of printed argument. If it is bigger, width is ignored.	382	* - Specify minimal width of printed argument. If it is bigger, width is ignored.
383	* If width is specified with a "*" character instead of number, width is taken from	383	* If width is specified with a "*" character instead of number, width is taken from
384	* parameter list. And integer parameter is expected before parameter for processed	384	* parameter list. And integer parameter is expected before parameter for processed
385	* conversion specification. If this value is negative its absolute value is taken	385	* conversion specification. If this value is negative its absolute value is taken
386	* and the "-" flag is set.	386	* and the "-" flag is set.
387	*	387	*
388	* PRECISION:@n	388	* PRECISION:@n
389	* - Value precision. For numbers it specifies minimum valid numbers.	389	* - Value precision. For numbers it specifies minimum valid numbers.
390	* Smaller numbers are printed with leading zeroes. Bigger numbers are not affected.	390	* Smaller numbers are printed with leading zeroes. Bigger numbers are not affected.
391	* Strings with more than precision characters are cut off.	391	* Strings with more than precision characters are cut off.
392	* Just as with width, an "*" can be used used instead of a number.	392	* Just as with width, an "*" can be used used instead of a number.
393	* An integer value is then expected in parameters. When both width and precision	393	* An integer value is then expected in parameters. When both width and precision
394	* are specified using "*", the first parameter is used for width and the second one	394	* are specified using "*", the first parameter is used for width and the second one
395	* for precision.	395	* for precision.
396	*	396	*
397	* TYPE:@n	397	* TYPE:@n
398	* - "hh" Signed or unsigned char.@n	398	* - "hh" Signed or unsigned char.@n
399	* - "h" Signed or usigned short.@n	399	* - "h" Signed or usigned short.@n
400	* - "" Signed or usigned int (default value).@n	400	* - "" Signed or usigned int (default value).@n
401	* - "l" Signed or usigned long int.@n	401	* - "l" Signed or usigned long int.@n
402	* - "ll" Signed or usigned long long int.@n	402	* - "ll" Signed or usigned long long int.@n
403	* - "z" Type size_t.@n	403	* - "z" Type size_t.@n
404	*	404	*
405	*	405	*
406	* CONVERSION:@n	406	* CONVERSION:@n
407	* - % Print percentile character itself.	407	* - % Print percentile character itself.
408	*	408	*
409	* - c Print single character.	409	* - c Print single character.
410	*	410	*
411	* - s Print zero terminated string. If a NULL value is passed as value, "(NULL)" is printed instead.	411	* - s Print zero terminated string. If a NULL value is passed as value, "(NULL)" is printed instead.
412	*	412	*
413	* - P, p Print value of a pointer. Void * value is expected and it is printed in hexadecimal notation with prefix	413	* - P, p Print value of a pointer. Void * value is expected and it is printed in hexadecimal notation with prefix
414	* (as with '\%#X' or '\%#x' for 32bit or '\%#X' or '\%#x' for 64bit long pointers).	414	* (as with '\%#X' or '\%#x' for 32bit or '\%#X' or '\%#x' for 64bit long pointers).
415	*	415	*
416	* - b Print value as unsigned binary number. Prefix is not printed by default. (Nonstandard extension.)	416	* - b Print value as unsigned binary number. Prefix is not printed by default. (Nonstandard extension.)
417	*	417	*
418	* - o Print value as unsigned octal number. Prefix is not printed by default.	418	* - o Print value as unsigned octal number. Prefix is not printed by default.
419	*	419	*
420	* - d,i Print signed decimal number. There is no difference between d and i conversion.	420	* - d,i Print signed decimal number. There is no difference between d and i conversion.
421	*	421	*
422	* - u Print unsigned decimal number.	422	* - u Print unsigned decimal number.
423	*	423	*
424	* - X, x Print hexadecimal number with upper- or lower-case. Prefix is not printed by default.	424	* - X, x Print hexadecimal number with upper- or lower-case. Prefix is not printed by default.
425	*	425	*
426	* All other characters from fmt except the formatting directives	426	* All other characters from fmt except the formatting directives
427	* are printed in verbatim.	427	* are printed in verbatim.
428	*	428	*
429	* @param fmt Formatting NULL terminated string.	429	* @param fmt Formatting NULL terminated string.
430	* @return Number of printed characters or negative value on failure.	430	* @return Number of printed characters or negative value on failure.
431	*/	431	*/
432	int printf_core(const char fmt, struct printf_spec ps, va_list ap)	432	int printf_core(const char fmt, struct printf_spec ps, va_list ap)
433	{	433	{
434	int i = 0, j = 0; /* i is index of currently processed char from fmt, j is index to the first not printed nonformating character */	434	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 end;	435	int end;
436	int counter; /* counter of printed characters */	436	int counter; /* counter of printed characters */
437	int retval; /* used to store return values from called functions */	437	int retval; /* used to store return values from called functions */
438	char c;	438	char c;
439	qualifier_t qualifier; /* type of argument */	439	qualifier_t qualifier; /* type of argument */
440	int base; /* base in which will be parameter (numbers only) printed */	440	int base; /* base in which will be parameter (numbers only) printed */
441	uint64_t number; /* argument value */	441	uint64_t number; /* argument value */
442	size_t size; /* byte size of integer parameter */	442	size_t size; /* byte size of integer parameter */
443	int width, precision;	443	int width, precision;
444	uint64_t flags;	444	uint64_t flags;
445		445
446	counter = 0;	446	counter = 0;
447		447
448	while ((c = fmt[i])) {	448	while ((c = fmt[i])) {
449	/* control character */	449	/* control character */
450	if (c == '%' ) {	450	if (c == '%' ) {
451	/* print common characters if any processed */	451	/* print common characters if any processed */
452	if (i > j) {	452	if (i > j) {
453	if ((retval = printf_putnchars(&fmt[j], (size_t)(i - j), ps)) < 0) { /* error */	453	if ((retval = printf_putnchars(&fmt[j], (size_t)(i - j), ps)) < 0) { /* error */
454	goto minus_out;	454	goto minus_out;
455	}	455	}
456	counter += retval;	456	counter += retval;
457	}	457	}
458		458
459	j = i;	459	j = i;
460	/* parse modifiers */	460	/* parse modifiers */
461	flags = 0;	461	flags = 0;
462	end = 0;	462	end = 0;
463		463
464	do {	464	do {
465	++i;	465	++i;
466	switch (c = fmt[i]) {	466	switch (c = fmt[i]) {
467	case '#': flags \|= __PRINTF_FLAG_PREFIX; break;	467	case '#': flags \|= __PRINTF_FLAG_PREFIX; break;
468	case '-': flags \|= __PRINTF_FLAG_LEFTALIGNED; break;	468	case '-': flags \|= __PRINTF_FLAG_LEFTALIGNED; break;
469	case '+': flags \|= __PRINTF_FLAG_SHOWPLUS; break;	469	case '+': flags \|= __PRINTF_FLAG_SHOWPLUS; break;
470	case ' ': flags \|= __PRINTF_FLAG_SPACESIGN; break;	470	case ' ': flags \|= __PRINTF_FLAG_SPACESIGN; break;
471	case '0': flags \|= __PRINTF_FLAG_ZEROPADDED; break;	471	case '0': flags \|= __PRINTF_FLAG_ZEROPADDED; break;
472	default: end = 1;	472	default: end = 1;
473	};	473	};
474		474
475	} while (end == 0);	475	} while (end == 0);
476		476
477	/* width & '' operator /	477	/* width & '' operator /
478	width = 0;	478	width = 0;
479	if (isdigit(fmt[i])) {	479	if (isdigit(fmt[i])) {
480	while (isdigit(fmt[i])) {	480	while (isdigit(fmt[i])) {
481	width *= 10;	481	width *= 10;
482	width += fmt[i++] - '0';	482	width += fmt[i++] - '0';
483	}	483	}
484	} else if (fmt[i] == '*') {	484	} else if (fmt[i] == '*') {
485	/* get width value from argument list*/	485	/* get width value from argument list*/
486	i++;	486	i++;
487	width = (int)va_arg(ap, int);	487	width = (int)va_arg(ap, int);
488	if (width < 0) {	488	if (width < 0) {
489	/* negative width means to set '-' flag */	489	/* negative width means to set '-' flag */
490	width *= -1;	490	width *= -1;
491	flags \|= __PRINTF_FLAG_LEFTALIGNED;	491	flags \|= __PRINTF_FLAG_LEFTALIGNED;
492	}	492	}
493	}	493	}
494		494
495	/* precision and '' operator /	495	/* precision and '' operator /
496	precision = 0;	496	precision = 0;
497	if (fmt[i] == '.') {	497	if (fmt[i] == '.') {
498	++i;	498	++i;
499	if (isdigit(fmt[i])) {	499	if (isdigit(fmt[i])) {
500	while (isdigit(fmt[i])) {	500	while (isdigit(fmt[i])) {

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(root)/tags/0.2.0.5/uspace/libc/generic/io/printf_core.c – Rev 2230 → 2474