319 lines
6.9 KiB
C
319 lines
6.9 KiB
C
/*
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* MiSoC
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* Copyright (C) 2007, 2008, 2009 Sebastien Bourdeauducq
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* Copyright (C) Linux kernel developers
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include <math.h>
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/**
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* vsnprintf - Format a string and place it in a buffer
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* @buf: The buffer to place the result into
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* @size: The size of the buffer, including the trailing null space
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* @fmt: The format string to use
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* @args: Arguments for the format string
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*
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* The return value is the number of characters which would
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* be generated for the given input, excluding the trailing
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* '\0', as per ISO C99. If you want to have the exact
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* number of characters written into @buf as return value
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* (not including the trailing '\0'), use vscnprintf(). If the
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* return is greater than or equal to @size, the resulting
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* string is truncated.
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*
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* Call this function if you are already dealing with a va_list.
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* You probably want snprintf() instead.
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*/
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int vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
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{
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int len;
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unsigned long long num;
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int i, base;
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char *str, *end, c;
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const char *s;
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int flags; /* flags to number() */
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int field_width; /* width of output field */
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int precision; /* min. # of digits for integers; max
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number of chars for from string */
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int qualifier; /* 'h', 'l', or 'L' for integer fields */
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/* 'z' support added 23/7/1999 S.H. */
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/* 'z' changed to 'Z' --davidm 1/25/99 */
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/* 't' added for ptrdiff_t */
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/* Reject out-of-range values early. Large positive sizes are
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used for unknown buffer sizes. */
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if (unlikely((int) size < 0))
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return 0;
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str = buf;
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end = buf + size;
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/* Make sure end is always >= buf */
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if (end < buf) {
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end = ((void *)-1);
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size = end - buf;
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}
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for (; *fmt ; ++fmt) {
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if (*fmt != '%') {
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if (str < end)
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*str = *fmt;
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++str;
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continue;
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}
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/* process flags */
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flags = 0;
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repeat:
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++fmt; /* this also skips first '%' */
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switch (*fmt) {
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case '-': flags |= PRINTF_LEFT; goto repeat;
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case '+': flags |= PRINTF_PLUS; goto repeat;
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case ' ': flags |= PRINTF_SPACE; goto repeat;
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case '#': flags |= PRINTF_SPECIAL; goto repeat;
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case '0': flags |= PRINTF_ZEROPAD; goto repeat;
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}
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/* get field width */
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field_width = -1;
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if (isdigit(*fmt))
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field_width = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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field_width = va_arg(args, int);
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if (field_width < 0) {
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field_width = -field_width;
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flags |= PRINTF_LEFT;
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}
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}
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/* get the precision */
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precision = -1;
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if (*fmt == '.') {
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++fmt;
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if (isdigit(*fmt))
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precision = skip_atoi(&fmt);
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else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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precision = va_arg(args, int);
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}
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if (precision < 0)
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precision = 0;
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}
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/* get the conversion qualifier */
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qualifier = -1;
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if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' ||
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*fmt =='Z' || *fmt == 'z' || *fmt == 't') {
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qualifier = *fmt;
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++fmt;
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if (qualifier == 'l' && *fmt == 'l') {
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qualifier = 'L';
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++fmt;
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}
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}
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/* default base */
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base = 10;
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switch (*fmt) {
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case 'c':
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if (!(flags & PRINTF_LEFT)) {
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while (--field_width > 0) {
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if (str < end)
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*str = ' ';
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++str;
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}
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}
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c = (unsigned char) va_arg(args, int);
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if (str < end)
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*str = c;
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++str;
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while (--field_width > 0) {
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if (str < end)
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*str = ' ';
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++str;
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}
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continue;
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case 's':
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s = va_arg(args, char *);
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if (s == NULL)
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s = "<NULL>";
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len = strnlen(s, precision);
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if (!(flags & PRINTF_LEFT)) {
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while (len < field_width--) {
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if (str < end)
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*str = ' ';
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++str;
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}
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}
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for (i = 0; i < len; ++i) {
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if (str < end)
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*str = *s;
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++str; ++s;
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}
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while (len < field_width--) {
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if (str < end)
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*str = ' ';
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++str;
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}
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continue;
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case 'p':
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if (field_width == -1) {
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field_width = 2*sizeof(void *);
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flags |= PRINTF_ZEROPAD;
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}
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str = number(str, end,
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(unsigned long) va_arg(args, void *),
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16, field_width, precision, flags);
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continue;
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#ifndef NO_FLOAT
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case 'g':
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case 'f': {
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double f, g;
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f = va_arg(args, double);
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if(f < 0.0) {
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if(str < end)
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*str = '-';
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str++;
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f = -f;
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}
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g = pow(10.0, floor(log10(f)));
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if(g < 1.0) {
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if(str < end)
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*str = '0';
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str++;
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}
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while(g >= 1.0) {
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if(str < end)
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*str = '0' + fmod(f/g, 10.0);
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str++;
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g /= 10.0;
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}
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if(str < end)
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*str = '.';
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str++;
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for(i=0;i<6;i++) {
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f = fmod(f*10.0, 10.0);
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if(str < end)
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*str = '0' + f;
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str++;
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}
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continue;
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}
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#endif
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case 'n':
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/* FIXME:
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* What does C99 say about the overflow case here? */
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if (qualifier == 'l') {
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long * ip = va_arg(args, long *);
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*ip = (str - buf);
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} else if (qualifier == 'Z' || qualifier == 'z') {
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size_t * ip = va_arg(args, size_t *);
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*ip = (str - buf);
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} else {
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int * ip = va_arg(args, int *);
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*ip = (str - buf);
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}
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continue;
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case '%':
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if (str < end)
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*str = '%';
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++str;
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continue;
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/* integer number formats - set up the flags and "break" */
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case 'o':
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base = 8;
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break;
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case 'X':
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flags |= PRINTF_LARGE;
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case 'x':
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base = 16;
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break;
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case 'd':
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case 'i':
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flags |= PRINTF_SIGN;
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case 'u':
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break;
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default:
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if (str < end)
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*str = '%';
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++str;
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if (*fmt) {
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if (str < end)
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*str = *fmt;
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++str;
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} else {
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--fmt;
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}
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continue;
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}
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if (qualifier == 'L')
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num = va_arg(args, long long);
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else if (qualifier == 'l') {
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num = va_arg(args, unsigned long);
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if (flags & PRINTF_SIGN)
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num = (signed long) num;
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} else if (qualifier == 'Z' || qualifier == 'z') {
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num = va_arg(args, size_t);
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} else if (qualifier == 't') {
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num = va_arg(args, ptrdiff_t);
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} else if (qualifier == 'h') {
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num = (unsigned short) va_arg(args, int);
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if (flags & PRINTF_SIGN)
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num = (signed short) num;
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} else {
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num = va_arg(args, unsigned int);
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if (flags & PRINTF_SIGN)
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num = (signed int) num;
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}
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str = number(str, end, num, base,
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field_width, precision, flags);
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}
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if (size > 0) {
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if (str < end)
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*str = '\0';
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else
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end[-1] = '\0';
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}
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/* the trailing null byte doesn't count towards the total */
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return str-buf;
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}
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