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php-src/main/spprintf.c
Marcus Boerger c664a0a202 introducing spprintf and vspprintf 
#mail follows
2002-04-10 01:09:22 +00:00

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/*
+----------------------------------------------------------------------+
| PHP Version 4 |
+----------------------------------------------------------------------+
| Copyright (c) 1997-2002 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 2.02 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available at through the world-wide-web at |
| http://www.php.net/license/2_02.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.
*/
#include "php.h"
#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
/*
* 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
/*
* Size for realloc operations
*/
#define SPPRINTF_BLOCK_SIZE 10
/*
* Descriptor for buffer area
*/
struct xbuf_area {
char *buf; /* pointer to buffer */
size_t size;
size_t max_len;
char *buf_end; /* pointer to buffer end or ~0 */
char *nextb; /* pointer to next byte to read/write */
};
typedef struct xbuf_area xbuffy;
/* Resize xbuf so that add bytes can be added. Reallocation is done
* in defined block size to minimize calls to realloc.
*/
static int xbuf_resize(xbuffy *xbuf, size_t add)
{
char *buf;
int ret;
size_t size, offset;
if (xbuf->buf) {
offset = xbuf->nextb - xbuf->buf;
if (offset+add < xbuf->size) {
return 0; /* do not change size if not necessary */
}
} else {
offset = 0;
}
if (add<SPPRINTF_BLOCK_SIZE) {
size = xbuf->size + SPPRINTF_BLOCK_SIZE;
} else {
size = xbuf->size + add;
}
if (xbuf->max_len && size > xbuf->max_len) {
size = xbuf->max_len;
ret = 1;
} else {
ret = 0;
}
buf = erealloc(xbuf->buf, size+1); /* alloc space for NUL */
if (!buf) {
return 1;
} else {
xbuf->buf = buf;
xbuf->buf_end = xbuf->max_len ? &buf[size] : (char *) ~0;
xbuf->nextb = buf+offset;
xbuf->size = size;
return ret;
}
}
/* Initialise xbuffy with size spprintf_BLOCK_SIZE
*/
static int xbuf_init(xbuffy *xbuf, size_t max_len)
{
xbuf->buf = NULL;
xbuf->size = 0;
xbuf->max_len = max_len;
return xbuf_resize(xbuf, 0); /* NOT max_len */
}
/*
* The INS_CHAR macro inserts a character in the buffer and writes
* the buffer back to disk if necessary
* It uses the char pointers sp and bep:
* sp points to the next available character in the buffer
* bep points to the end-of-buffer+1
* While using this macro, note that the nextb pointer is NOT updated.
*
* NOTE: Evaluation of the c argument should not have any side-effects
*/
#define INS_CHAR_NR(xbuf, ch, cc) \
if (xbuf->nextb < xbuf->buf_end) { \
*(xbuf->nextb++) = ch; \
cc++; \
}
#define INS_CHAR(xbuf, ch, cc) \
xbuf_resize(xbuf, 1); \
INS_CHAR_NR(xbuf, ch, cc)
/*
* Macro that does padding. The padding is done by printing
* the character ch.
*/
#define PAD(xbuf, width, len, ch) \
if (width > len) { \
xbuf_resize(xbuf, width-len); \
do { \
INS_CHAR_NR(xbuf, ch, cc); \
width--; \
} \
while (width > len);\
}
#define NUM(c) (c - '0')
#define STR_TO_DEC(str, num) \
num = NUM(*str++); \
while (isdigit((int)*str)) { \
num *= 10; \
num += NUM(*str++); \
}
/*
* 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) \
if (adjust) \
while (s_len < precision) { \
*--s = '0'; \
s_len++; \
}
/*
* Prefix the character ch to the string str
* Increase length
* Set the has_prefix flag
*/
#define PREFIX(str, length, ch) \
*--str = ch; \
length++; \
has_prefix = YES
/*
* Do format conversion placing the output in buffer
*/
static int xbuf_format_converter(register xbuffy * xbuf, const char *fmt, va_list ap)
{
register int cc = 0;
register int i;
register char *s = NULL;
char *q;
int s_len;
register 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> */
/*
* Flag variables
*/
boolean_e is_long;
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, cc);
} else {
/*
* Default variable settings
*/
adjust = RIGHT;
alternate_form = print_sign = print_blank = NO;
pad_char = ' ';
prefix_char = NUL;
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
*/
if (*fmt == 'l') {
is_long = YES;
fmt++;
} else
is_long = NO;
/*
* 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 'u':
if (is_long)
i_num = va_arg(ap, u_wide_int);
else
i_num = (wide_int) va_arg(ap, unsigned int);
/*
* 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') {
if (is_long)
i_num = va_arg(ap, wide_int);
else
i_num = (wide_int) va_arg(ap, int);
};
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':
if (is_long)
ui_num = va_arg(ap, u_wide_int);
else
ui_num = (u_wide_int) va_arg(ap, unsigned int);
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':
if (is_long)
ui_num = (u_wide_int) va_arg(ap, u_wide_int);
else
ui_num = (u_wide_int) va_arg(ap, unsigned int);
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':
s = va_arg(ap, char *);
if (s != NULL) {
s_len = strlen(s);
if (adjust_precision && precision < s_len)
s_len = precision;
} else {
s = S_NULL;
s_len = S_NULL_LEN;
}
pad_char = ' ';
break;
case 'f':
case 'e':
case 'E':
fp_num = va_arg(ap, double);
if (zend_isnan(fp_num)) {
s = "nan";
s_len = 3;
} else if (zend_isinf(fp_num)) {
s = "inf";
s_len = 3;
} else {
s = ap_php_conv_fp(*fmt, fp_num, alternate_form,
(adjust_precision == NO) ? FLOAT_DIGITS : precision,
&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 'G':
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
*/
s = ap_php_gcvt(va_arg(ap, double), precision, &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++] = '.';
if (*fmt == 'G' && (q = strchr(s, 'e')) != NULL)
*q = 'E';
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 *)) = cc;
break;
/*
* 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':
ui_num = (u_wide_int) va_arg(ap, char *);
if (sizeof(char *) <= sizeof(u_wide_int))
s = ap_php_conv_p2(ui_num, 4, 'x', &num_buf[NUM_BUF_SIZE], &s_len);
else {
s = "%p";
s_len = 2;
}
pad_char = ' ';
break;
case NUL:
/*
* The last character of the format string was %.
* We ignore it.
*/
continue;
/*
* 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, cc)
s++;
s_len--;
min_width--;
}
PAD(xbuf, min_width, s_len, pad_char);
}
/*
* Print the string s.
*/
xbuf_resize(xbuf, s_len);
for (i = s_len; i != 0; i--) {
INS_CHAR_NR(xbuf, *s, cc);
s++;
}
if (adjust_width && adjust == LEFT && min_width > s_len)
PAD(xbuf, min_width, s_len, pad_char);
}
fmt++;
}
return (cc);
}
/*
* This is the general purpose conversion function.
*/
int vspprintf(char **pbuf, size_t max_len, const char *format, va_list ap)
{
xbuffy xbuf;
int cc;
assert(pbuf != NULL);
/*
* First initialize the descriptor
* Notice that if no length is given, we initialize buf_end to the
* highest possible address.
*/
if (xbuf_init(&xbuf, max_len)) {
*pbuf = NULL;
return 0;
} else {
/*
* Do the conversion
*/
cc = xbuf_format_converter(&xbuf, format, ap);
if (xbuf.nextb <= xbuf.buf_end)
*(xbuf.nextb) = '\0';
*pbuf = xbuf.buf;
return cc;
}
}
int spprintf(char **pbuf, size_t max_len, const char *format, ...)
{
int cc;
va_list ap;
va_start(ap, format);
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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