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552 lines
10 KiB
C
552 lines
10 KiB
C
/* $Id$
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: lib/ntdll/stdio/sprintf.c
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* PURPOSE: Single byte sprintf functions
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* PROGRAMMERS: David Welch
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* Eric Kohl
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*
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*/
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/*
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* linux/lib/vsprintf.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
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/*
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* Wirzenius wrote this portably, Torvalds fucked it up :-)
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*/
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#define __NO_CTYPE_INLINES
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#include <ctype.h>
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#include <limits.h>
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#define NDEBUG
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#include <ntdll.h>
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#define ZEROPAD 1 /* pad with zero */
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#define SIGN 2 /* unsigned/signed long */
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#define PLUS 4 /* show plus */
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#define SPACE 8 /* space if plus */
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#define LEFT 16 /* left justified */
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#define SPECIAL 32 /* 0x */
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#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
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#define do_div(n,base) ({ \
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int __res; \
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__res = ((unsigned long long) n) % (unsigned) base; \
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n = ((unsigned long long) n) / (unsigned) base; \
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__res; })
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static int skip_atoi(const char **s)
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{
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int i=0;
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while (isdigit(**s))
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i = i*10 + *((*s)++) - '0';
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return i;
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}
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static char *
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number(char * buf, char * end, long long num, int base, int size, int precision, int type)
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{
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char c,sign,tmp[66];
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const char *digits;
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const char *small_digits = "0123456789abcdefghijklmnopqrstuvwxyz";
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const char *large_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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int i;
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digits = (type & LARGE) ? large_digits : small_digits;
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if (type & LEFT)
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type &= ~ZEROPAD;
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if (base < 2 || base > 36)
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return 0;
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c = (type & ZEROPAD) ? '0' : ' ';
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sign = 0;
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if (type & SIGN) {
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if (num < 0) {
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sign = '-';
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num = -num;
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size--;
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} else if (type & PLUS) {
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sign = '+';
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size--;
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} else if (type & SPACE) {
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sign = ' ';
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size--;
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}
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}
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if (type & SPECIAL) {
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if (base == 16)
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size -= 2;
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else if (base == 8)
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size--;
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}
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i = 0;
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if (num == 0)
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tmp[i++]='0';
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else while (num != 0)
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tmp[i++] = digits[do_div(num,base)];
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if (i > precision)
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precision = i;
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size -= precision;
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if (!(type&(ZEROPAD+LEFT))) {
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while(size-->0) {
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if (buf <= end)
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*buf = ' ';
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++buf;
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}
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}
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if (sign) {
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if (buf <= end)
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*buf = sign;
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++buf;
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}
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if (type & SPECIAL) {
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if (base==8) {
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if (buf <= end)
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*buf = '0';
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++buf;
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} else if (base==16) {
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if (buf <= end)
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*buf = '0';
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++buf;
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if (buf <= end)
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*buf = digits[33];
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++buf;
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}
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}
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if (!(type & LEFT)) {
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while (size-- > 0) {
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if (buf <= end)
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*buf = c;
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++buf;
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}
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}
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while (i < precision--) {
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if (buf <= end)
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*buf = '0';
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++buf;
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}
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while (i-- > 0) {
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if (buf <= end)
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*buf = tmp[i];
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++buf;
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}
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while (size-- > 0) {
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if (buf <= end)
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*buf = ' ';
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++buf;
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}
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return buf;
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}
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static char*
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string(char* buf, char* end, const char* s, int len, int field_width, int precision, int flags)
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{
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int i;
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if (s == NULL)
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{
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s = "<NULL>";
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len = 6;
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}
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else
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{
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if (len == -1)
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{
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len = 0;
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while ((unsigned int)len < (unsigned int)precision && s[len])
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len++;
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}
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else
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{
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if ((unsigned int)len > (unsigned int)precision)
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len = precision;
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}
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}
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if (!(flags & LEFT))
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while (len < field_width--)
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{
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if (buf <= end)
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*buf = ' ';
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++buf;
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}
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for (i = 0; i < len; ++i)
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{
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if (buf <= end)
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*buf = *s++;
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++buf;
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}
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while (len < field_width--)
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{
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if (buf <= end)
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*buf = ' ';
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++buf;
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}
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return buf;
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}
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static char*
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stringw(char* buf, char* end, const wchar_t* sw, int len, int field_width, int precision, int flags)
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{
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int i;
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if (sw == NULL)
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{
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sw = L"<NULL>";
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len = 6;
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}
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else
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{
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if (len == -1)
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{
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len = 0;
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while ((unsigned int)len < (unsigned int)precision && sw[len])
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len++;
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}
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else
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{
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if ((unsigned int)len > (unsigned int)precision)
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len = precision;
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}
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}
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if (!(flags & LEFT))
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while (len < field_width--)
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{
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if (buf <= end)
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*buf = ' ';
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++buf;
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}
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for (i = 0; i < len; ++i)
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{
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if (buf <= end)
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*buf = (unsigned char)(*sw++);
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++buf;
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}
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while (len < field_width--)
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{
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if (buf <= end)
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*buf = ' ';
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++buf;
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}
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return buf;
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}
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/*
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* @implemented
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*/
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int _vsnprintf(char *buf, size_t cnt, 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 base;
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char *str, *end;
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const char *s;
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const wchar_t *sw;
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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', 'L', 'I' or 'w' for integer fields */
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str = buf;
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end = buf + cnt - 1;
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if (end < buf - 1) {
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end = ((void *) -1);
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cnt = end - buf + 1;
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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 |= LEFT; goto repeat;
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case '+': flags |= PLUS; goto repeat;
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case ' ': flags |= SPACE; goto repeat;
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case '#': flags |= SPECIAL; goto repeat;
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case '0': flags |= 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 |= 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' || *fmt == 'w') {
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qualifier = *fmt;
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++fmt;
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} else if (*fmt == 'I' && *(fmt+1) == '6' && *(fmt+2) == '4') {
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qualifier = *fmt;
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fmt += 3;
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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': /* finished */
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if (!(flags & 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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if (qualifier == 'l' || qualifier == 'w') {
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if (str <= end)
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*str = (unsigned char)(wchar_t) va_arg(args, int);
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++str;
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} else {
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if (str <= end)
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*str = (unsigned char) va_arg(args, int);
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++str;
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}
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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 'C': /* finished */
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if (!(flags & 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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if (qualifier == 'h') {
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if (str <= end)
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*str = (unsigned char) va_arg(args, int);
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++str;
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} else {
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if (str <= end)
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*str = (unsigned char)(wchar_t) va_arg(args, int);
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++str;
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}
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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': /* finished */
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if (qualifier == 'l' || qualifier == 'w') {
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/* print unicode string */
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sw = va_arg(args, wchar_t *);
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str = stringw(str, end, sw, -1, field_width, precision, flags);
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} else {
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/* print ascii string */
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s = va_arg(args, char *);
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str = string(str, end, s, -1, field_width, precision, flags);
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}
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continue;
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case 'S':
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if (qualifier == 'h') {
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/* print ascii string */
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s = va_arg(args, char *);
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str = string(str, end, s, -1, field_width, precision, flags);
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} else {
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/* print unicode string */
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sw = va_arg(args, wchar_t *);
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str = stringw(str, end, sw, -1, field_width, precision, flags);
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}
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continue;
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case 'Z':
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if (qualifier == 'w') {
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/* print counted unicode string */
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PUNICODE_STRING pus = va_arg(args, PUNICODE_STRING);
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if ((pus == NULL) || (pus->Buffer == NULL)) {
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sw = NULL;
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len = -1;
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} else {
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sw = pus->Buffer;
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len = pus->Length / sizeof(WCHAR);
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}
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str = stringw(str, end, sw, len, field_width, precision, flags);
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} else {
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/* print counted ascii string */
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PANSI_STRING pus = va_arg(args, PANSI_STRING);
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if ((pus == NULL) || (pus->Buffer == NULL)) {
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s = NULL;
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len = -1;
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} else {
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s = pus->Buffer;
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len = pus->Length;
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}
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str = string(str, end, s, len, field_width, precision, flags);
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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 |= ZEROPAD;
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}
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str = number(str, end,
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(unsigned long) va_arg(args, void *), 16,
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field_width, precision, flags);
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continue;
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case 'n':
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/* FIXME: 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 {
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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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/* 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 'b':
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base = 2;
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break;
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case 'X':
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flags |= 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 |= SIGN;
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case 'u':
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break;
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default:
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if (*fmt != '%') {
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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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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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continue;
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}
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if (qualifier == 'I')
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num = va_arg(args, unsigned long long);
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else if (qualifier == 'l') {
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if (flags & SIGN)
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num = va_arg(args, long);
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else
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num = va_arg(args, unsigned long);
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}
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else if (qualifier == 'h') {
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if (flags & SIGN)
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num = va_arg(args, int);
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else
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num = va_arg(args, unsigned int);
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}
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else {
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if (flags & SIGN)
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num = va_arg(args, int);
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else
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num = va_arg(args, unsigned int);
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}
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str = number(str, end, num, base, field_width, precision, flags);
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}
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if (str <= end)
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*str = '\0';
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else if (cnt > 0)
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/* don't write out a null byte if the buf size is zero */
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*end = '\0';
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return str-buf;
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}
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/*
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* @implemented
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*/
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int sprintf(char * buf, const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i=_vsnprintf(buf,INT_MAX,fmt,args);
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va_end(args);
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return i;
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}
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/*
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* @implemented
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*/
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int _snprintf(char * buf, size_t cnt, const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i=_vsnprintf(buf,cnt,fmt,args);
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va_end(args);
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return i;
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}
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/*
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* @implemented
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*/
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int vsprintf(char *buf, const char *fmt, va_list args)
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{
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return _vsnprintf(buf,INT_MAX,fmt,args);
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}
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/* EOF */
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