| /* |
| * This file is part of the libpayload project. |
| * |
| * It has originally been taken from the HelenOS project |
| * (http://www.helenos.eu), and slightly modified for our purposes. |
| * |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * Copyright (C) 2006 Josef Cejka |
| * Copyright (C) 2008 Uwe Hermann <uwe@hermann-uwe.de> |
| * 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. |
| */ |
| |
| #include <libpayload.h> |
| #include <ctype.h> |
| |
| static struct _FILE { |
| } _stdout, _stdin, _stderr; |
| |
| FILE *stdout = &_stdout; |
| FILE *stdin = &_stdin; |
| FILE *stderr = &_stderr; |
| |
| /** Structure for specifying output methods for different printf clones. */ |
| struct printf_spec { |
| /* Output function, returns count of printed characters or EOF. */ |
| int (*write) (void *, size_t, void *); |
| /* Support data - output stream specification, its state, locks, ... */ |
| void *data; |
| }; |
| |
| /** Show prefixes 0x or 0. */ |
| #define __PRINTF_FLAG_PREFIX 0x00000001 |
| /** Signed / unsigned number. */ |
| #define __PRINTF_FLAG_SIGNED 0x00000002 |
| /** Print leading zeroes. */ |
| #define __PRINTF_FLAG_ZEROPADDED 0x00000004 |
| /** Align to left. */ |
| #define __PRINTF_FLAG_LEFTALIGNED 0x00000010 |
| /** Always show + sign. */ |
| #define __PRINTF_FLAG_SHOWPLUS 0x00000020 |
| /** Print space instead of plus. */ |
| #define __PRINTF_FLAG_SPACESIGN 0x00000040 |
| /** Show big characters. */ |
| #define __PRINTF_FLAG_BIGCHARS 0x00000080 |
| /** Number has - sign. */ |
| #define __PRINTF_FLAG_NEGATIVE 0x00000100 |
| |
| /** |
| * Buffer big enough 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). |
| */ |
| #define PRINT_NUMBER_BUFFER_SIZE (64 + 5) |
| |
| /** Enumeration of possible arguments types. */ |
| typedef enum { |
| PrintfQualifierByte = 0, |
| PrintfQualifierShort, |
| PrintfQualifierInt, |
| PrintfQualifierLong, |
| PrintfQualifierLongLong, |
| PrintfQualifierPointer, |
| } qualifier_t; |
| |
| static const char digits_small[] = "0123456789abcdef"; |
| static const char digits_big[] = "0123456789ABCDEF"; |
| |
| /** |
| * Print one or more characters without adding newline. |
| * |
| * @param buf Buffer of >= count bytesi size. NULL pointer is not allowed! |
| * @param count Number of characters to print. |
| * @param ps Output method and its data. |
| * @return Number of characters printed. |
| */ |
| static int printf_putnchars(const char *buf, size_t count, |
| struct printf_spec *ps) |
| { |
| return ps->write((void *)buf, count, ps->data); |
| } |
| |
| /** |
| * Print a string without adding a newline. |
| * |
| * @param str String to print. |
| * @param ps Write function specification and support data. |
| * @return Number of characters printed. |
| */ |
| static inline int printf_putstr(const char *str, struct printf_spec *ps) |
| { |
| return printf_putnchars(str, strlen(str), ps); |
| } |
| |
| /** |
| * Print one character. |
| * |
| * @param c Character to be printed. |
| * @param ps Output method. |
| * @return Number of characters printed. |
| */ |
| 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 Width modifier. |
| * @param flags Flags that change the way the character is printed. |
| * @param ps Output methods spec for different printf clones. |
| * @return Number of characters printed, negative value on failure. |
| */ |
| 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) { |
| if (printf_putchar(' ', ps) > 0) |
| ++counter; |
| } |
| } |
| |
| if (printf_putchar(c, ps) > 0) |
| counter++; |
| |
| while (--width > 0) { |
| if (printf_putchar(' ', ps) > 0) |
| ++counter; |
| } |
| |
| return counter; |
| } |
| |
| /** |
| * Print string. |
| * |
| * @param s String to be printed. |
| * @param width Width modifier. |
| * @param precision Precision modifier. |
| * @param flags Flags that modify the way the string is printed. |
| * @param ps Output methods spec for different printf clones. |
| * @return Number of characters printed, negative value on failure. |
| */ |
| /** Structure for specifying output methods for different printf clones. */ |
| static int print_string(char *s, int width, unsigned int precision, |
| uint64_t flags, struct printf_spec *ps) |
| { |
| int counter = 0, retval; |
| 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) { |
| if (printf_putchar(' ', ps) == 1) |
| counter++; |
| } |
| } |
| |
| if ((retval = printf_putnchars(s, MIN(size, precision), ps)) < 0) |
| return -counter; |
| counter += retval; |
| |
| while (width-- > 0) { |
| if (printf_putchar(' ', ps) == 1) |
| ++counter; |
| } |
| |
| return counter; |
| } |
| |
| /** |
| * Print a number in a given base. |
| * |
| * Print significant digits of a number in given base. |
| * |
| * @param num Number to print. |
| * @param width Width modifier.h |
| * @param precision Precision modifier. |
| * @param base Base to print the number in (must be between 2 and 16). |
| * @param flags Flags that modify the way the number is printed. |
| * @param ps Output methods spec for different printf clones. |
| * @return Number of characters printed. |
| */ |
| static int print_number(uint64_t num, int width, int precision, int base, |
| uint64_t flags, struct printf_spec *ps) |
| { |
| const char *digits = digits_small; |
| char d[PRINT_NUMBER_BUFFER_SIZE]; |
| 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 the 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 useful. */ |
| 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 the number is left-aligned or precision is specified then |
| * zero-padding is ignored. |
| */ |
| if (flags & __PRINTF_FLAG_ZEROPADDED) { |
| if ((precision == 0) && (width > size)) |
| precision = width - size + number_size; |
| } |
| |
| /* Print leading spaces. */ |
| if (number_size > precision) { |
| /* Print the 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 useful. */ |
| 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 \%o conversion, 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 the minimal width of a 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 unsigned short.@n |
| * - "" Signed or unsigned int (default value).@n |
| * - "l" Signed or unsigned long int.@n |
| * - "ll" Signed or unsigned long long int.@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 / \%#x |
| * for 32-bit or \%#X / \%#x for 64-bit 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. |
| * @param ps TODO. |
| * @param ap TODO. |
| * @return Number of characters printed, negative value on failure. |
| */ |
| static int printf_core(const char *fmt, struct printf_spec *ps, va_list ap) |
| { |
| int i = 0; /* Index of the currently processed char from fmt */ |
| int j = 0; /* 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 a numeric parameter will be 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) { |
| counter = -counter; |
| goto out; /* Error */ |
| } |
| 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 sets '-' 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 from argument list. */ |
| i++; |
| precision = (int)va_arg(ap, int); |
| /* Ignore negative precision. */ |
| if (precision < 0) |
| 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; |
| default: |
| /* default type */ |
| qualifier = PrintfQualifierInt; |
| --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) { |
| counter = -counter; |
| goto out; |
| }; |
| counter += retval; |
| j = i + 1; |
| goto next_char; |
| case 'c': |
| c = va_arg(ap, unsigned int); |
| retval = print_char(c, width, flags, ps); |
| if (retval < 0) { |
| counter = -counter; |
| goto 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; |
| case '%': /* percentile itself */ |
| j = i; |
| goto next_char; |
| default: /* Bad formatting */ |
| /* |
| * Unknown format. Now, j is the 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; |
| default: /* Unknown qualifier */ |
| counter = -counter; |
| goto 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) { |
| counter = -counter; |
| goto out; |
| } |
| |
| counter += retval; |
| j = i + 1; |
| } |
| next_char: |
| ++i; |
| } |
| |
| if (i > j) { |
| if ((retval = printf_putnchars(&fmt[j], |
| (u64) (i - j), ps)) < 0) { |
| counter = -counter; |
| goto out; /* Error */ |
| |
| } |
| counter += retval; |
| } |
| |
| out: |
| return counter; |
| } |
| |
| int snprintf(char *str, size_t size, const char *fmt, ...) |
| { |
| int ret; |
| va_list args; |
| |
| va_start(args, fmt); |
| ret = vsnprintf(str, size, fmt, args); |
| va_end(args); |
| |
| return ret; |
| } |
| |
| int sprintf(char *str, const char *fmt, ...) |
| { |
| int ret; |
| va_list args; |
| |
| va_start(args, fmt); |
| ret = vsprintf(str, fmt, args); |
| va_end(args); |
| |
| return ret; |
| } |
| |
| int fprintf(FILE *file, const char *fmt, ...) |
| { |
| int ret; |
| if ((file == stdout) || (file == stderr)) { |
| va_list args; |
| va_start(args, fmt); |
| ret = vprintf(fmt, args); |
| va_end(args); |
| |
| return ret; |
| } |
| return -1; |
| } |
| |
| struct vsnprintf_data { |
| size_t size; /* Total space for string */ |
| size_t len; /* Count of currently used characters */ |
| char *string; /* Destination string */ |
| }; |
| |
| /** |
| * Write string to given buffer. |
| * |
| * Write at most data->size characters including trailing zero. According to |
| * C99, snprintf() has to return number of characters that would have been |
| * written if enough space had been available. Hence the return value is not |
| * number of really printed characters but size of the input string. |
| * Number of really used characters is stored in data->len. |
| * |
| * @param str Source string to print. |
| * @param count Size of source string. |
| * @param data Structure with destination string, counter of used space |
| * and total string size. |
| * @return Number of characters to print (not characters really printed!). |
| */ |
| static int vsnprintf_write(const char *str, size_t count, |
| struct vsnprintf_data *data) |
| { |
| size_t i; |
| |
| i = data->size - data->len; |
| if (i == 0) |
| return count; |
| |
| /* We have only one free byte left in buffer => write trailing zero. */ |
| if (i == 1) { |
| data->string[data->size - 1] = 0; |
| data->len = data->size; |
| return count; |
| } |
| |
| /* |
| * We have not enough space for whole string with the trailing |
| * zero => print only a part of string. |
| */ |
| if (i <= count) { |
| memcpy((void *)(data->string + data->len), (void *)str, i - 1); |
| data->string[data->size - 1] = 0; |
| data->len = data->size; |
| return count; |
| } |
| |
| /* Buffer is big enough to print whole string. */ |
| memcpy((void *)(data->string + data->len), (void *)str, count); |
| data->len += count; |
| /* |
| * Put trailing zero at end, but not count it into data->len so |
| * it could be rewritten next time. |
| */ |
| data->string[data->len] = 0; |
| |
| return count; |
| } |
| |
| int vsnprintf(char *str, size_t size, const char *fmt, va_list ap) |
| { |
| struct vsnprintf_data data = { size, 0, str }; |
| struct printf_spec ps = |
| { (int (*)(void *, size_t, void *))vsnprintf_write, &data }; |
| |
| /* Print 0 at end of string - fix case that nothing will be printed. */ |
| if (size > 0) |
| str[0] = 0; |
| |
| /* vsnprintf_write() ensures that str will be terminated by zero. */ |
| return printf_core(fmt, &ps, ap); |
| } |
| |
| int vsprintf(char *str, const char *fmt, va_list ap) |
| { |
| return vsnprintf(str, (size_t) - 1, fmt, ap); |
| } |
| |
| int printf(const char *fmt, ...) |
| { |
| int ret; |
| va_list args; |
| |
| va_start(args, fmt); |
| ret = vprintf(fmt, args); |
| va_end(args); |
| |
| return ret; |
| } |
| |
| static int vprintf_write(const char *str, size_t count, void *unused) |
| { |
| size_t i; |
| |
| for (i = 0; i < count; i++) |
| putchar(str[i]); |
| |
| return i; |
| } |
| |
| int vprintf(const char *fmt, va_list ap) |
| { |
| struct printf_spec ps = |
| { (int (*)(void *, size_t, void *))vprintf_write, NULL }; |
| |
| return printf_core(fmt, &ps, ap); |
| } |