Tuesday, December 2, 2014

Android 5.0 호환성 문제 - sprintf 직접 구현

예전에 안드로이드 5.0에서 sprintf를 NDK에서 사용했더니 로케일이 달라서 씹히던 문제가 있었다. 그래서 로케일을 상관하지 않는 ANSI용 sprintf를 직접 구현한 소스를 조립해서 NDK에서 기존 sprintf를 대체하니 문제가 말끔히 해결되었다. 다음은 sprintf를 직접 구현한 소스이다. 물론 vsprintf도 직접 구현하였다. 구분 하기 위해서 새로 구현한 sprintf는 대문자로 SPRINTF2라고 명명하였다.

//
// sprintf.c
//
// Print formatting routines
//
// Copyright (C) 2002 Michael Ringgaard. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. 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.
// 3. Neither the name of the project nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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 <sys/types.h>
#include <stdarg.h>
//#include <string.h>
#include <stdlib.h>
//#include <malloc.h>

#ifdef KERNEL
#define NOFLOAT
#endif

#define CVTBUFSIZE 1024
//#ifndef NOFLOAT
//#include <os.h>
//#endif

#define ZEROPAD 1               // Pad with zero
#define SIGN    2               // Unsigned/signed long
#define PLUS    4               // Show plus
#define SPACE   8               // Space if plus
#define LEFT    16              // Left justified
#define SPECIAL 32              // 0x
#define LARGE   64              // Use 'ABCDEF' instead of 'abcdef'

#define is_digit(c) ((c) >= '0' && (c) <= '9')

static char *digits = "0123456789abcdefghijklmnopqrstuvwxyz";
static char *upper_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";

static size_t strnlen2(const char *s, size_t count) {
const char *sc;
for (sc = s; *sc != '\0' && count--; ++sc);
return sc - s;
}

static int skip_atoi(const char **s) {
int i = 0;
while (is_digit(**s)) i = i * 10 + *((*s)++) - '0';
return i;
}

static char *number(char *str, long num, int base, int size, int precision, int type) {
char c, sign, tmp[66];
char *dig = digits;
int i;

if (type & LARGE)  dig = upper_digits;
if (type & LEFT) type &= ~ZEROPAD;
if (base < 2 || base > 36) return 0;

c = (type & ZEROPAD) ? '0' : ' ';
sign = 0;
if (type & SIGN) {
if (num < 0) {
sign = '-';
num = -num;
size--;
}
else if (type & PLUS) {
sign = '+';
size--;
}
else if (type & SPACE) {
sign = ' ';
size--;
}
}

if (type & SPECIAL) {
if (base == 16) {
size -= 2;
}
else if (base == 8) {
size--;
}
}

i = 0;

if (num == 0) {
tmp[i++] = '0';
}
else {
while (num != 0) {
tmp[i++] = dig[((unsigned long)num) % (unsigned)base];
num = ((unsigned long)num) / (unsigned)base;
}
}

if (i > precision) precision = i;
size -= precision;
if (!(type & (ZEROPAD | LEFT))) while (size-- > 0) *str++ = ' ';
if (sign) *str++ = sign;

if (type & SPECIAL) {
if (base == 8) {
*str++ = '0';
}
else if (base == 16) {
*str++ = '0';
*str++ = digits[33];
}
}

if (!(type & LEFT)) while (size-- > 0) *str++ = c;
while (i < precision--) *str++ = '0';
while (i-- > 0) *str++ = tmp[i];
while (size-- > 0) *str++ = ' ';

return str;
}

static char *eaddr(char *str, unsigned char *addr, int size, int precision, int type) {
char tmp[24];
char *dig = digits;
int i, len;

if (type & LARGE)  dig = upper_digits;
len = 0;
for (i = 0; i < 6; i++) {
if (i != 0) tmp[len++] = ':';
tmp[len++] = dig[addr[i] >> 4];
tmp[len++] = dig[addr[i] & 0x0F];
}

if (!(type & LEFT)) while (len < size--) *str++ = ' ';
for (i = 0; i < len; ++i) *str++ = tmp[i];
while (len < size--) *str++ = ' ';

return str;
}

static char *iaddr(char *str, unsigned char *addr, int size, int precision, int type) {
char tmp[24];
int i, n, len;

len = 0;
for (i = 0; i < 4; i++) {
if (i != 0) tmp[len++] = '.';
n = addr[i];

if (n == 0) {
tmp[len++] = digits[0];
}
else {
if (n >= 100) {
tmp[len++] = digits[n / 100];
n = n % 100;
tmp[len++] = digits[n / 10];
n = n % 10;
}
else if (n >= 10) {
tmp[len++] = digits[n / 10];
n = n % 10;
}

tmp[len++] = digits[n];
}
}

if (!(type & LEFT)) while (len < size--) *str++ = ' ';
for (i = 0; i < len; ++i) *str++ = tmp[i];
while (len < size--) *str++ = ' ';

return str;
}

#ifndef NOFLOAT

char *ecvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf);
char *fcvtbuf(double arg, int ndigits, int *decpt, int *sign, char *buf);

static void cfltcvt(double value, char *buffer, char fmt, int precision) {
int decpt, sign, exp, pos;
char *digits = NULL;
char cvtbuf[CVTBUFSIZE];
int capexp = 0;
int magnitude;

if (fmt == 'G' || fmt == 'E') {
capexp = 1;
fmt += 'a' - 'A';
}

if (fmt == 'g') {
digits = ecvtbuf(value, precision, &decpt, &sign, cvtbuf);
magnitude = decpt - 1;
if (magnitude < -4 || magnitude > precision - 1) {
fmt = 'e';
precision -= 1;
}
else {
fmt = 'f';
precision -= decpt;
}
}

if (fmt == 'e') {
digits = ecvtbuf(value, precision + 1, &decpt, &sign, cvtbuf);

if (sign) *buffer++ = '-';
*buffer++ = *digits;
if (precision > 0) *buffer++ = '.';
memcpy(buffer, digits + 1, precision);
buffer += precision;
*buffer++ = capexp ? 'E' : 'e';

if (decpt == 0) {
if (value == 0.0) {
exp = 0;
}
else {
exp = -1;
}
}
else {
exp = decpt - 1;
}

if (exp < 0) {
*buffer++ = '-';
exp = -exp;
}
else {
*buffer++ = '+';
}

buffer[2] = (exp % 10) + '0';
exp = exp / 10;
buffer[1] = (exp % 10) + '0';
exp = exp / 10;
buffer[0] = (exp % 10) + '0';
buffer += 3;
}
else if (fmt == 'f') {
digits = fcvtbuf(value, precision, &decpt, &sign, cvtbuf);
if (sign) *buffer++ = '-';
if (*digits) {
if (decpt <= 0) {
*buffer++ = '0';
*buffer++ = '.';
for (pos = 0; pos < -decpt; pos++) *buffer++ = '0';
while (*digits) *buffer++ = *digits++;
}
else {
pos = 0;
while (*digits) {
if (pos++ == decpt) *buffer++ = '.';
*buffer++ = *digits++;
}
}
}
else {
*buffer++ = '0';
if (precision > 0) {
*buffer++ = '.';
for (pos = 0; pos < precision; pos++) *buffer++ = '0';
}
}
}

*buffer = '\0';
}

static void forcdecpt(char *buffer) {
while (*buffer) {
if (*buffer == '.') return;
if (*buffer == 'e' || *buffer == 'E') break;
buffer++;
}

if (*buffer) {
int n = strlen(buffer);
while (n > 0) {
buffer[n + 1] = buffer[n];
n--;
}

*buffer = '.';
}
else {
*buffer++ = '.';
*buffer = '\0';
}
}

static void cropzeros(char *buffer) {
char *stop;

while (*buffer && *buffer != '.') buffer++;
if (*buffer++) {
while (*buffer && *buffer != 'e' && *buffer != 'E') buffer++;
stop = buffer--;
while (*buffer == '0') buffer--;
if (*buffer == '.') buffer--;
while (*++buffer = *stop++);
}
}

static char *flt(char *str, double num, int size, int precision, char fmt, int flags) {
char cvtbuf[CVTBUFSIZE];
char c, sign;
int n, i;

// Left align means no zero padding
if (flags & LEFT) flags &= ~ZEROPAD;

// Determine padding and sign char
c = (flags & ZEROPAD) ? '0' : ' ';
sign = 0;
if (flags & SIGN) {
if (num < 0.0) {
sign = '-';
num = -num;
size--;
}
else if (flags & PLUS) {
sign = '+';
size--;
}
else if (flags & SPACE) {
sign = ' ';
size--;
}
}

// Compute the precision value
if (precision < 0) {
precision = 6; // Default precision: 6
}
else if (precision == 0 && fmt == 'g') {
precision = 1; // ANSI specified
}

// Convert floating point number to text
cfltcvt(num, cvtbuf, fmt, precision);

// '#' and precision == 0 means force a decimal point
if ((flags & SPECIAL) && precision == 0) forcdecpt(cvtbuf);

// 'g' format means crop zero unless '#' given
if (fmt == 'g' && !(flags & SPECIAL)) cropzeros(cvtbuf);

n = strlen(cvtbuf);

// Output number with alignment and padding
size -= n;
if (!(flags & (ZEROPAD | LEFT))) while (size-- > 0) *str++ = ' ';
if (sign) *str++ = sign;
if (!(flags & LEFT)) while (size-- > 0) *str++ = c;
for (i = 0; i < n; i++) *str++ = cvtbuf[i];
while (size-- > 0) *str++ = ' ';

return str;
}

#endif

int vsprintf(char *buf, const char *fmt, va_list args) {
int len;
unsigned long num;
int i, base;
char *str;
char *s;

int flags;            // Flags to number()

int field_width;      // Width of output field
int precision;        // Min. # of digits for integers; max number of chars for from string
int qualifier;        // 'h', 'l', or 'L' for integer fields

for (str = buf; *fmt; fmt++) {
if (*fmt != '%') {
*str++ = *fmt;
continue;
}

// Process flags
flags = 0;
repeat:
fmt++; // This also skips first '%'
switch (*fmt) {
case '-': flags |= LEFT; goto repeat;
case '+': flags |= PLUS; goto repeat;
case ' ': flags |= SPACE; goto repeat;
case '#': flags |= SPECIAL; goto repeat;
case '0': flags |= ZEROPAD; goto repeat;
}

// Get field width
field_width = -1;
if (is_digit(*fmt)) {
field_width = skip_atoi(&fmt);
}
else if (*fmt == '*') {
fmt++;
field_width = va_arg(args, int);
if (field_width < 0) {
field_width = -field_width;
flags |= LEFT;
}
}

// Get the precision
precision = -1;
if (*fmt == '.') {
++fmt;
if (is_digit(*fmt)) {
precision = skip_atoi(&fmt);
}
else if (*fmt == '*') {
++fmt;
precision = va_arg(args, int);
}
if (precision < 0) precision = 0;
}

// Get the conversion qualifier
qualifier = -1;
if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
qualifier = *fmt;
fmt++;
}

// Default base
base = 10;

switch (*fmt) {
case 'c':
if (!(flags & LEFT)) while (--field_width > 0) *str++ = ' ';
*str++ = (unsigned char)va_arg(args, int);
while (--field_width > 0) *str++ = ' ';
continue;

case 's':
s = va_arg(args, char *);
if (!s) s = "<NULL>";
len = strnlen2(s, precision);
if (!(flags & LEFT)) while (len < field_width--) *str++ = ' ';
for (i = 0; i < len; ++i) *str++ = *s++;
while (len < field_width--) *str++ = ' ';
continue;

case 'p':
if (field_width == -1) {
field_width = 2 * sizeof(void *);
flags |= ZEROPAD;
}
str = number(str, (unsigned long)va_arg(args, void *), 16, field_width, precision, flags);
continue;

case 'n':
if (qualifier == 'l') {
long *ip = va_arg(args, long *);
*ip = (str - buf);
}
else {
int *ip = va_arg(args, int *);
*ip = (str - buf);
}
continue;

case 'A':
flags |= LARGE;

case 'a':
if (qualifier == 'l') {
str = eaddr(str, va_arg(args, unsigned char *), field_width, precision, flags);
}
else {
str = iaddr(str, va_arg(args, unsigned char *), field_width, precision, flags);
}
continue;

// Integer number formats - set up the flags and "break"
case 'o':
base = 8;
break;

case 'X':
flags |= LARGE;

case 'x':
base = 16;
break;

case 'd':
case 'i':
flags |= SIGN;

case 'u':
break;

#ifndef NOFLOAT

case 'E':
case 'G':
case 'e':
case 'f':
case 'g':
str = flt(str, va_arg(args, double), field_width, precision, *fmt, flags | SIGN);
continue;

#endif

default:
if (*fmt != '%') *str++ = '%';
if (*fmt) {
*str++ = *fmt;
}
else {
--fmt;
}
continue;
}

if (qualifier == 'l') {
num = va_arg(args, unsigned long);
}
else if (qualifier == 'h') {
if (flags & SIGN) {
num = va_arg(args, short);
}
else {
num = va_arg(args, unsigned short);
}
}
else if (flags & SIGN) {
num = va_arg(args, int);
}
else {
num = va_arg(args, unsigned int);
}

str = number(str, num, base, field_width, precision, flags);
}

*str = '\0';
return str - buf;
}

int SPRINTF2(char *buf, const char *fmt, ...) {
va_list args;
int n;

va_start(args, fmt);
n = vsprintf(buf, fmt, args);
va_end(args);

return n;
}

/* Copyright (C) 1998 DJ Delorie, see COPYING.DJ for details
fcvtbuf.c */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <float.h>
#include <alloc.h>
#ifdef WIN32
#include <malloc.h>
#endif

// #include <crtdll/locale.h>

void __ecvround(char *, char *, const char *, int *);

char *
fcvtbuf(double value, int ndigits, int *decpt, int *sign, char *buf)
{
static char INFINITY[] = "Infinity";
char decimal = '.' /* localeconv()->decimal_point[0] */;
int digits = ndigits >= 0 ? ndigits : 0;
char *cvtbuf = (char *)alloca(2 * DBL_MAX_10_EXP + 16);
char *s = cvtbuf;
char *dot;

SPRINTF2(cvtbuf, "%-+#.*f", DBL_MAX_10_EXP + digits + 1, value);

/* The sign.  */
if (*s++ == '-')
*sign = 1;
else
*sign = 0;

/* Where's the decimal point?  */
dot = strchr(s, decimal);
*decpt = dot ? dot - s : strlen(s);

/* SunOS docs says if NDIGITS is 8 or more, produce "Infinity"
instead of "Inf".  */
if (strncmp(s, "Inf", 3) == 0)
{
memcpy(buf, INFINITY, ndigits >= 8 ? 9 : 3);
if (ndigits < 8)
buf[3] = '\0';
return buf;
}
else if (ndigits < 0)
return ecvtbuf(value, *decpt + ndigits, decpt, sign, buf);
else if (*s == '0' && value != 0.0)
return ecvtbuf(value, ndigits, decpt, sign, buf);
else
{
memcpy(buf, s, *decpt);
if (s[*decpt] == decimal)
{
memcpy(buf + *decpt, s + *decpt + 1, ndigits);
buf[*decpt + ndigits] = '\0';
}
else
buf[*decpt] = '\0';
__ecvround(buf, buf + *decpt + ndigits - 1,
s + *decpt + ndigits + 1, decpt);
return buf;
}
}

/* Copyright (C) 1998 DJ Delorie, see COPYING.DJ for details 
ecvtbuf.c */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <float.h>
#include <locale.h>

#ifdef WIN32
#include <malloc.h>
#endif

void __ecvround(char *, char *, const char *, int *);

void
__ecvround(char *numbuf, char *last_digit, const char *after_last, int *decpt)
{
char *p;
int carry = 0;

/* Do we have at all to round the last digit?  */
if (*after_last > '4')
{
p = last_digit;
carry = 1;

/* Propagate the rounding through trailing '9' digits.  */
do {
int sum = *p + carry;
carry = sum > '9';
*p-- = sum - carry * 10;
} while (carry && p >= numbuf);

/* We have 9999999... which needs to be rounded to 100000..  */
if (carry && p == numbuf)
{
*p = '1';
*decpt += 1;
}
}
}

char *
ecvtbuf(double value, int ndigits, int *decpt, int *sign, char *buf)
{
static char INFINITY[] = "Infinity";
/*char decimal = localeconv()->decimal_point[0];*/
char decimal = '.'; 
char *cvtbuf = (char *)alloca(ndigits + 20); /* +3 for sign, dot, null; */
/* two extra for rounding */
/* 15 extra for alignment */
char *s = cvtbuf, *d = buf;

/* Produce two extra digits, so we could round properly.  */
SPRINTF2(cvtbuf, "%-+.*E", ndigits + 2, value);
*decpt = 0;

/* The sign.  */
if (*s++ == '-')
*sign = 1;
else
*sign = 0;

/* Special values get special treatment.  */
if (strncmp(s, "Inf", 3) == 0)
{
/* SunOS docs says we have return "Infinity" for NDIGITS >= 8.  */
memcpy(buf, INFINITY, ndigits >= 8 ? 9 : 3);
if (ndigits < 8)
buf[3] = '\0';
}
else if (strcmp(s, "NaN") == 0)
memcpy(buf, s, 4);
else
{
char *last_digit, *digit_after_last;

/* Copy (the single) digit before the decimal.  */
while (*s && *s != decimal && d - buf < ndigits)
*d++ = *s++;

/* If we don't see any exponent, here's our decimal point.  */
*decpt = d - buf;
if (*s)
s++;

/* Copy the fraction digits.  */
while (*s && *s != 'E' && d - buf < ndigits)
*d++ = *s++;

/* Remember the last digit copied and the one after it.  */
last_digit = d > buf ? d - 1 : d;
digit_after_last = s;

/* Get past the E in exponent field.  */
while (*s && *s++ != 'E')
;

/* Adjust the decimal point by the exponent value.  */
*decpt += atoi(s);

/* Pad with zeroes if needed.  */
while (d - buf < ndigits)
*d++ = '0';

/* Zero-terminate.  */
*d = '\0';

/* Round if necessary.  */
__ecvround(buf, last_digit, digit_after_last, decpt);
}
return buf;
}

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