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php-src/main/spprintf.c
George Peter Banyard 2b5fb76de6 Apply custom format/length modifier removal to spprintf 
This mimicks the changes made to the custom snprintf implementation
by removing the custom 'v' format and custom 'I' length modifier
from the spprintf implementation.

Closes GH-5108
2020-01-23 13:45:28 +01:00

807 lines
20 KiB
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/*
+----------------------------------------------------------------------+
| Copyright (c) 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> |
+----------------------------------------------------------------------+
*/
/* 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
#include <locale.h>
#ifdef ZTS
#include "ext/standard/php_string.h"
#define LCONV_DECIMAL_POINT (*lconv.decimal_point)
#else
#define LCONV_DECIMAL_POINT (*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 "zend_smart_str.h"
#include "zend_smart_string.h"
/* {{{ macros */
#define INS_CHAR(xbuf, ch, is_char) do { \
if ((is_char)) { \
smart_string_appendc((smart_string *)(xbuf), (ch)); \
} else { \
smart_str_appendc((smart_str *)(xbuf), (ch)); \
} \
} while (0);
#define INS_STRING(xbuf, str, len, is_char) do { \
if ((is_char)) { \
smart_string_appendl((smart_string *)(xbuf), (str), (len)); \
} else { \
smart_str_appendl((smart_str *)(xbuf), (str), (len)); \
} \
} while (0);
#define PAD_CHAR(xbuf, ch, count, is_char) do { \
if ((is_char)) { \
smart_string_alloc(((smart_string *)(xbuf)), (count), 0); \
memset(((smart_string *)(xbuf))->c + ((smart_string *)(xbuf))->len, (ch), (count)); \
((smart_string *)(xbuf))->len += (count); \
} else { \
smart_str_alloc(((smart_str *)(xbuf)), (count), 0); \
memset(ZSTR_VAL(((smart_str *)(xbuf))->s) + ZSTR_LEN(((smart_str *)(xbuf))->s), (ch), (count)); \
ZSTR_LEN(((smart_str *)(xbuf))->s) += (count); \
} \
} while (0);
/*
* NUM_BUF_SIZE is the size of the buffer used for arithmetic conversions
* which can be at most max length of double
*/
#define NUM_BUF_SIZE PHP_DOUBLE_MAX_LENGTH
#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 < (size_t)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(void *xbuf, zend_bool is_char, const char *fmt, va_list ap) /* {{{ */
{
char *s = NULL;
size_t s_len;
int 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 = (u_wide_int) 0;
char num_buf[NUM_BUF_SIZE];
char char_buf[2]; /* for printing %% and %<unknown> */
#ifdef ZTS
struct lconv lconv;
#else
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, is_char);
} 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
*/
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 < -1)
precision = -1;
} else
precision = 0;
if (precision > FORMAT_CONV_MAX_PRECISION) {
precision = FORMAT_CONV_MAX_PRECISION;
}
} else
adjust_precision = NO;
} else
adjust_precision = adjust_width = NO;
/*
* Modifier check
*/
switch (*fmt) {
case 'L':
fmt++;
modifier = LM_LONG_DOUBLE;
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 'p': {
char __next = *(fmt+1);
if ('d' == __next || 'u' == __next || 'x' == __next || 'o' == __next) {
fmt++;
modifier = LM_PHP_INT_T;
} else {
modifier = LM_STD;
}
}
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*);
free_zcopy = zend_make_printable_zval(zvp, &zcopy);
if (free_zcopy) {
zvp = &zcopy;
}
s_len = Z_STRLEN_P(zvp);
s = Z_STRVAL_P(zvp);
if (adjust_precision && (size_t)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
case LM_PHP_INT_T:
i_num = (wide_int) va_arg(ap, zend_ulong);
break;
}
/*
* 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
case LM_PHP_INT_T:
i_num = (wide_int) va_arg(ap, zend_long);
break;
}
}
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
case LM_PHP_INT_T:
ui_num = (u_wide_int) va_arg(ap, zend_ulong);
break;
}
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
case LM_PHP_INT_T:
ui_num = (u_wide_int) va_arg(ap, zend_ulong);
break;
}
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 && ui_num != 0) {
*--s = *fmt; /* 'x' or 'X' */
*--s = '0';
s_len += 2;
}
break;
case 's':
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 ZTS
localeconv_r(&lconv);
#else
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 ZTS
localeconv_r(&lconv);
#else
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 && (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 *)) = is_char? (int)((smart_string *)xbuf)->len : (int)ZSTR_LEN(((smart_str *)xbuf)->s);
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 && (size_t)min_width > s_len) {
if (pad_char == '0' && prefix_char != NUL) {
INS_CHAR(xbuf, *s, is_char);
s++;
s_len--;
min_width--;
}
PAD_CHAR(xbuf, pad_char, min_width - s_len, is_char);
}
/*
* Print the string s.
*/
INS_STRING(xbuf, s, s_len, is_char);
if (adjust_width && adjust == LEFT && (size_t)min_width > s_len) {
PAD_CHAR(xbuf, pad_char, min_width - s_len, is_char);
}
if (free_zcopy) {
zval_ptr_dtor_str(&zcopy);
}
}
skip_output:
fmt++;
}
return;
}
/* }}} */
PHPAPI void php_printf_to_smart_string(smart_string *buf, const char *format, va_list ap) /* {{{ */
{
xbuf_format_converter(buf, 1, format, ap);
}
/* }}} */
PHPAPI void php_printf_to_smart_str(smart_str *buf, const char *format, va_list ap) /* {{{ */
{
xbuf_format_converter(buf, 0, format, ap);
}
/* }}} */
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