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/*
+----------------------------------------------------------------------+
| PHP Version 5 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2010 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Marcus Boerger <helly@php.net> |
+----------------------------------------------------------------------+
*/

/* $Id$ */

/* This is the spprintf implementation.
* It has emerged from apache snprintf. See original header:
*/

/* ====================================================================
* Copyright (c) 1995-1998 The Apache Group. 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. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
* endorse or promote products derived from this software without
* prior written permission.
*
* 5. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the Apache Group
* for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED 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 APACHE GROUP OR
* ITS 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
* This code is based on, and used with the permission of, the
* SIO stdio-replacement strx_* functions by Panos Tsirigotis
* <panos@alumni.cs.colorado.edu> for xinetd.
*/
#define _GNU_SOURCE
#include "php.h"

#include <stddef.h>
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif

#ifdef HAVE_LOCALE_H
#include <locale.h>
#define LCONV_DECIMAL_POINT (*lconv->decimal_point)
#else
#define LCONV_DECIMAL_POINT '.'
#endif

#include "snprintf.h"

#define FALSE 0
#define TRUE 1
#define NUL '\0'
#define INT_NULL ((int *)0)

#define S_NULL "(null)"
#define S_NULL_LEN 6

#define FLOAT_DIGITS 6
#define EXPONENT_LENGTH 10

#include "ext/standard/php_smart_str.h"

/* {{{ macros */

/*
* NUM_BUF_SIZE is the size of the buffer used for arithmetic conversions
*
* XXX: this is a magic number; do not decrease it
*/
#define NUM_BUF_SIZE 512

/*
* The INS_CHAR macro inserts a character in the buffer.
*
* NOTE: Evaluation of the ch argument should not have any side-effects
*/
#define INS_CHAR_NR(xbuf, ch) do { \
smart_str_appendc(xbuf, ch); \
} while (0)

#define INS_STRING(xbuf, s, slen) do { \
smart_str_appendl(xbuf, s, slen); \
} while (0)

#define INS_CHAR(xbuf, ch) \
INS_CHAR_NR(xbuf, ch)

/*
* Macro that does padding. The padding is done by printing
* the character ch.
*/
#define PAD(xbuf, count, ch) do { \
if ((count) > 0) { \
size_t newlen; \
smart_str_alloc(xbuf, (count), 0); \
memset(xbuf->c + xbuf->len, ch, (count)); \
xbuf->len += (count); \
} \
} while (0)

#define NUM(c) (c - '0')

#define STR_TO_DEC(str, num) do { \
num = NUM(*str++); \
while (isdigit((int)*str)) { \
num *= 10; \
num += NUM(*str++); \
if (num >= INT_MAX / 10) { \
while (isdigit((int)*str++)); \
break; \
} \
} \
} while (0)

/*
* This macro does zero padding so that the precision
* requirement is satisfied. The padding is done by
* adding '0's to the left of the string that is going
* to be printed.
*/
#define FIX_PRECISION(adjust, precision, s, s_len) do { \
if (adjust) \
while (s_len < precision) { \
*--s = '0'; \
s_len++; \
} \
} while (0)

/* }}} */


#if !HAVE_STRNLEN
static size_t strnlen(const char *s, size_t maxlen) {
char *r = memchr(s, '\0', maxlen);
return r ? r-s : maxlen;
}
#endif

/*
* Do format conversion placing the output in buffer
*/
static void xbuf_format_converter(smart_str *xbuf, const char *fmt, va_list ap) /* {{{ */
{
char *s = NULL;
char *q;
int s_len, free_zcopy;
zval *zvp, zcopy;

int min_width = 0;
int precision = 0;
enum {
LEFT, RIGHT
} adjust;
char pad_char;
char prefix_char;

double fp_num;
wide_int i_num = (wide_int) 0;
u_wide_int ui_num;

char num_buf[NUM_BUF_SIZE];
char char_buf[2]; /* for printing %% and %<unknown> */

#ifdef HAVE_LOCALE_H
struct lconv *lconv = NULL;
#endif

/*
* Flag variables
*/
length_modifier_e modifier;
boolean_e alternate_form;
boolean_e print_sign;
boolean_e print_blank;
boolean_e adjust_precision;
boolean_e adjust_width;
bool_int is_negative;

while (*fmt) {
if (*fmt != '%') {
INS_CHAR(xbuf, *fmt);
} else {
/*
* Default variable settings
*/
adjust = RIGHT;
alternate_form = print_sign = print_blank = NO;
pad_char = ' ';
prefix_char = NUL;
free_zcopy = 0;

fmt++;

/*
* Try to avoid checking for flags, width or precision
*/
if (isascii((int)*fmt) && !islower((int)*fmt)) {
/*
* Recognize flags: -, #, BLANK, +
*/
for (;; fmt++) {
if (*fmt == '-')
adjust = LEFT;
else if (*fmt == '+')
print_sign = YES;
else if (*fmt == '#')
alternate_form = YES;
else if (*fmt == ' ')
print_blank = YES;
else if (*fmt == '0')
pad_char = '0';
else
break;
}

/*
* Check if a width was specified
*/
if (isdigit((int)*fmt)) {
STR_TO_DEC(fmt, min_width);
adjust_width = YES;
} else if (*fmt == '*') {
min_width = va_arg(ap, int);
fmt++;
adjust_width = YES;
if (min_width < 0) {
adjust = LEFT;
min_width = -min_width;
}
} else
adjust_width = NO;

/*
* Check if a precision was specified
*
* XXX: an unreasonable amount of precision may be specified
* resulting in overflow of num_buf. Currently we
* ignore this possibility.
*/
if (*fmt == '.') {
adjust_precision = YES;
fmt++;
if (isdigit((int)*fmt)) {
STR_TO_DEC(fmt, precision);
} else if (*fmt == '*') {
precision = va_arg(ap, int);
fmt++;
if (precision < 0)
precision = 0;
} else
precision = 0;
} else
adjust_precision = NO;
} else
adjust_precision = adjust_width = NO;

/*
* Modifier check
*/
switch (*fmt) {
case 'L':
fmt++;
modifier = LM_LONG_DOUBLE;
break;
case 'I':
fmt++;
#if SIZEOF_LONG_LONG
if (*fmt == '6' && *(fmt+1) == '4') {
fmt += 2;
modifier = LM_LONG_LONG;
} else
#endif
if (*fmt == '3' && *(fmt+1) == '2') {
fmt += 2;
modifier = LM_LONG;
} else {
#ifdef _WIN64
modifier = LM_LONG_LONG;
#else
modifier = LM_LONG;
#endif
}
break;
case 'l':
fmt++;
#if SIZEOF_LONG_LONG
if (*fmt == 'l') {
fmt++;
modifier = LM_LONG_LONG;
} else
#endif
modifier = LM_LONG;
break;
case 'z':
fmt++;
modifier = LM_SIZE_T;
break;
case 'j':
fmt++;
#if SIZEOF_INTMAX_T
modifier = LM_INTMAX_T;
#else
modifier = LM_SIZE_T;
#endif
break;
case 't':
fmt++;
#if SIZEOF_PTRDIFF_T
modifier = LM_PTRDIFF_T;
#else
modifier = LM_SIZE_T;
#endif
break;
case 'h':
fmt++;
if (*fmt == 'h') {
fmt++;
}
/* these are promoted to int, so no break */
default:
modifier = LM_STD;
break;
}

/*
* Argument extraction and printing.
* First we determine the argument type.
* Then, we convert the argument to a string.
* On exit from the switch, s points to the string that
* must be printed, s_len has the length of the string
* The precision requirements, if any, are reflected in s_len.
*
* NOTE: pad_char may be set to '0' because of the 0 flag.
* It is reset to ' ' by non-numeric formats
*/
switch (*fmt) {
case 'Z':
zvp = (zval*) va_arg(ap, zval*);
zend_make_printable_zval(zvp, &zcopy, &free_zcopy);
if (free_zcopy) {
zvp = &zcopy;
}
s_len = Z_STRLEN_P(zvp);
s = Z_STRVAL_P(zvp);
if (adjust_precision && precision < s_len) {
s_len = precision;
}
break;
case 'u':
switch(modifier) {
default:
i_num = (wide_int) va_arg(ap, unsigned int);
break;
case LM_LONG_DOUBLE:
goto fmt_error;
case LM_LONG:
i_num = (wide_int) va_arg(ap, unsigned long int);
break;
case LM_SIZE_T:
i_num = (wide_int) va_arg(ap, size_t);
break;
#if SIZEOF_LONG_LONG
case LM_LONG_LONG:
i_num = (wide_int) va_arg(ap, u_wide_int);
break;
#endif
#if SIZEOF_INTMAX_T
case LM_INTMAX_T:
i_num = (wide_int) va_arg(ap, uintmax_t);
break;
#endif
#if SIZEOF_PTRDIFF_T
case LM_PTRDIFF_T:
i_num = (wide_int) va_arg(ap, ptrdiff_t);
break;
#endif
}
/*
* The rest also applies to other integer formats, so fall
* into that case.
*/
case 'd':
case 'i':
/*
* Get the arg if we haven't already.
*/
if ((*fmt) != 'u') {
switch(modifier) {
default:
i_num = (wide_int) va_arg(ap, int);
break;
case LM_LONG_DOUBLE:
goto fmt_error;
case LM_LONG:
i_num = (wide_int) va_arg(ap, long int);
break;
case LM_SIZE_T:
#if SIZEOF_SSIZE_T
i_num = (wide_int) va_arg(ap, ssize_t);
#else
i_num = (wide_int) va_arg(ap, size_t);
#endif
break;
#if SIZEOF_LONG_LONG
case LM_LONG_LONG:
i_num = (wide_int) va_arg(ap, wide_int);
break;
#endif
#if SIZEOF_INTMAX_T
case LM_INTMAX_T:
i_num = (wide_int) va_arg(ap, intmax_t);
break;
#endif
#if SIZEOF_PTRDIFF_T
case LM_PTRDIFF_T:
i_num = (wide_int) va_arg(ap, ptrdiff_t);
break;
#endif
}
}
s = ap_php_conv_10(i_num, (*fmt) == 'u', &is_negative,
&num_buf[NUM_BUF_SIZE], &s_len);
FIX_PRECISION(adjust_precision, precision, s, s_len);

if (*fmt != 'u') {
if (is_negative)
prefix_char = '-';
else if (print_sign)
prefix_char = '+';
else if (print_blank)
prefix_char = ' ';
}
break;


case 'o':
switch(modifier) {
default:
ui_num = (u_wide_int) va_arg(ap, unsigned int);
break;
case LM_LONG_DOUBLE:
goto fmt_error;
case LM_LONG:
ui_num = (u_wide_int) va_arg(ap, unsigned long int);
break;
case LM_SIZE_T:
ui_num = (u_wide_int) va_arg(ap, size_t);
break;
#if SIZEOF_LONG_LONG
case LM_LONG_LONG:
ui_num = (u_wide_int) va_arg(ap, u_wide_int);
break;
#endif
#if SIZEOF_INTMAX_T
case LM_INTMAX_T:
ui_num = (u_wide_int) va_arg(ap, uintmax_t);
break;
#endif
#if SIZEOF_PTRDIFF_T
case LM_PTRDIFF_T:
ui_num = (u_wide_int) va_arg(ap, ptrdiff_t);
break;
#endif
}
s = ap_php_conv_p2(ui_num, 3, *fmt,
&num_buf[NUM_BUF_SIZE], &s_len);
FIX_PRECISION(adjust_precision, precision, s, s_len);
if (alternate_form && *s != '0') {
*--s = '0';
s_len++;
}
break;


case 'x':
case 'X':
switch(modifier) {
default:
ui_num = (u_wide_int) va_arg(ap, unsigned int);
break;
case LM_LONG_DOUBLE:
goto fmt_error;
case LM_LONG:
ui_num = (u_wide_int) va_arg(ap, unsigned long int);
break;
case LM_SIZE_T:
ui_num = (u_wide_int) va_arg(ap, size_t);
break;
#if SIZEOF_LONG_LONG
case LM_LONG_LONG:
ui_num = (u_wide_int) va_arg(ap, u_wide_int);
break;
#endif
#if SIZEOF_INTMAX_T
case LM_INTMAX_T:
ui_num = (u_wide_int) va_arg(ap, uintmax_t);
break;
#endif
#if SIZEOF_PTRDIFF_T
case LM_PTRDIFF_T:
ui_num = (u_wide_int) va_arg(ap, ptrdiff_t);
break;
#endif
}
s = ap_php_conv_p2(ui_num, 4, *fmt,
&num_buf[NUM_BUF_SIZE], &s_len);
FIX_PRECISION(adjust_precision, precision, s, s_len);
if (alternate_form && i_num != 0) {
*--s = *fmt; /* 'x' or 'X' */
*--s = '0';
s_len += 2;
}
break;


case 's':
case 'v':
s = va_arg(ap, char *);
if (s != NULL) {
if (!adjust_precision) {
s_len = strlen(s);
} else {
s_len = strnlen(s, precision);
}
} else {
s = S_NULL;
s_len = S_NULL_LEN;
}
pad_char = ' ';
break;


case 'f':
case 'F':
case 'e':
case 'E':
switch(modifier) {
case LM_LONG_DOUBLE:
fp_num = (double) va_arg(ap, long double);
break;
case LM_STD:
fp_num = va_arg(ap, double);
break;
default:
goto fmt_error;
}

if (zend_isnan(fp_num)) {
s = "nan";
s_len = 3;
} else if (zend_isinf(fp_num)) {
s = "inf";
s_len = 3;
} else {
#ifdef HAVE_LOCALE_H
if (!lconv) {
lconv = localeconv();
}
#endif
s = php_conv_fp((*fmt == 'f')?'F':*fmt, fp_num, alternate_form,
(adjust_precision == NO) ? FLOAT_DIGITS : precision,
(*fmt == 'f')?LCONV_DECIMAL_POINT:'.',
&is_negative, &num_buf[1], &s_len);
if (is_negative)
prefix_char = '-';
else if (print_sign)
prefix_char = '+';
else if (print_blank)
prefix_char = ' ';
}
break;


case 'g':
case 'k':
case 'G':
case 'H':
switch(modifier) {
case LM_LONG_DOUBLE:
fp_num = (double) va_arg(ap, long double);
break;
case LM_STD:
fp_num = va_arg(ap, double);
break;
default:
goto fmt_error;
}

if (zend_isnan(fp_num)) {
  s = "NAN";
  s_len = 3;
  break;
  } else if (zend_isinf(fp_num)) {
  if (fp_num > 0) {
  s = "INF";
  s_len = 3;
  } else {
  s = "-INF";
  s_len = 4;
  }
  break;
  }

if (adjust_precision == NO)
precision = FLOAT_DIGITS;
else if (precision == 0)
precision = 1;
/*
* * We use &num_buf[ 1 ], so that we have room for the sign
*/
#ifdef HAVE_LOCALE_H
if (!lconv) {
lconv = localeconv();
}
#endif
s = php_gcvt(fp_num, precision, (*fmt=='H' || *fmt == 'k') ? '.' : LCONV_DECIMAL_POINT, (*fmt == 'G' || *fmt == 'H')?'E':'e', &num_buf[1]);
if (*s == '-')
prefix_char = *s++;
else if (print_sign)
prefix_char = '+';
else if (print_blank)
prefix_char = ' ';

s_len = strlen(s);

if (alternate_form && (q = strchr(s, '.')) == NULL)
s[s_len++] = '.';
break;


case 'c':
char_buf[0] = (char) (va_arg(ap, int));
s = &char_buf[0];
s_len = 1;
pad_char = ' ';
break;


case '%':
char_buf[0] = '%';
s = &char_buf[0];
s_len = 1;
pad_char = ' ';
break;


case 'n':
*(va_arg(ap, int *)) = xbuf->len;
goto skip_output;

/*
* Always extract the argument as a "char *" pointer. We
* should be using "void *" but there are still machines
* that don't understand it.
* If the pointer size is equal to the size of an unsigned
* integer we convert the pointer to a hex number, otherwise
* we print "%p" to indicate that we don't handle "%p".
*/
case 'p':
if (sizeof(char *) <= sizeof(u_wide_int)) {
ui_num = (u_wide_int)((size_t) va_arg(ap, char *));
s = ap_php_conv_p2(ui_num, 4, 'x',
&num_buf[NUM_BUF_SIZE], &s_len);
if (ui_num != 0) {
*--s = 'x';
*--s = '0';
s_len += 2;
}
} else {
s = "%p";
s_len = 2;
}
pad_char = ' ';
break;


case NUL:
/*
* The last character of the format string was %.
* We ignore it.
*/
continue;


fmt_error:
php_error(E_ERROR, "Illegal length modifier specified '%c' in s[np]printf call", *fmt);
/*
* The default case is for unrecognized %'s.
* We print %<char> to help the user identify what
* option is not understood.
* This is also useful in case the user wants to pass
* the output of format_converter to another function
* that understands some other %<char> (like syslog).
* Note that we can't point s inside fmt because the
* unknown <char> could be preceded by width etc.
*/
default:
char_buf[0] = '%';
char_buf[1] = *fmt;
s = char_buf;
s_len = 2;
pad_char = ' ';
break;
}

if (prefix_char != NUL) {
*--s = prefix_char;
s_len++;
}
if (adjust_width && adjust == RIGHT && min_width > s_len) {
if (pad_char == '0' && prefix_char != NUL) {
INS_CHAR(xbuf, *s);
s++;
s_len--;
min_width--;
}
PAD(xbuf, min_width - s_len, pad_char);
}
/*
* Print the string s.
*/
INS_STRING(xbuf, s, s_len);

if (adjust_width && adjust == LEFT && min_width > s_len)
PAD(xbuf, min_width - s_len, pad_char);
if (free_zcopy) {
zval_dtor(&zcopy);
}
}
skip_output:
fmt++;
}
return;
}
/* }}} */

/*
* This is the general purpose conversion function.
*/
PHPAPI int vspprintf(char **pbuf, size_t max_len, const char *format, va_list ap) /* {{{ */
{
smart_str xbuf = {0};

xbuf_format_converter(&xbuf, format, ap);

if (max_len && xbuf.len > max_len) {
xbuf.len = max_len;
}
smart_str_0(&xbuf);

*pbuf = xbuf.c;

return xbuf.len;
}
/* }}} */

PHPAPI int spprintf(char **pbuf, size_t max_len, const char *format, ...) /* {{{ */
{
int cc;
va_list ap;

va_start(ap, format);
cc = vspprintf(pbuf, max_len, format, ap);
va_end(ap);
return (cc);
}
/* }}} */

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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