/* Licensed to the Apache Software Foundation (ASF) under one or more

/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

/*
* This code is based on, and used with the permission of, the
* SIO stdio-replacement strx_* functions by Panos Tsirigotis
* <[email protected]> for xinetd.
*/

#include "config.h"
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <netinet/in.h>

#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif

typedef struct {
char *curpos;
char *endpos;
} ap_vformatter_buff;

#define API_EXPORT(type) type
#define API_EXPORT_NONSTD(type) type

#define ap_isalnum(c) (isalnum(((unsigned char)(c))))
#define ap_isalpha(c) (isalpha(((unsigned char)(c))))
#define ap_iscntrl(c) (iscntrl(((unsigned char)(c))))
#define ap_isdigit(c) (isdigit(((unsigned char)(c))))
#define ap_isgraph(c) (isgraph(((unsigned char)(c))))
#define ap_islower(c) (islower(((unsigned char)(c))))
#define ap_isprint(c) (isprint(((unsigned char)(c))))
#define ap_ispunct(c) (ispunct(((unsigned char)(c))))
#define ap_isspace(c) (isspace(((unsigned char)(c))))
#define ap_isupper(c) (isupper(((unsigned char)(c))))
#define ap_isxdigit(c) (isxdigit(((unsigned char)(c))))
#define ap_tolower(c) (tolower(((unsigned char)(c))))
#define ap_toupper(c) (toupper(((unsigned char)(c))))

typedef enum {
NO = 0, YES = 1
} boolean_e;

#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#ifndef AP_LONGEST_LONG
#define AP_LONGEST_LONG long
#endif
#define NUL '\0'
#define WIDE_INT long
#define WIDEST_INT AP_LONGEST_LONG

typedef WIDE_INT wide_int;
typedef unsigned WIDE_INT u_wide_int;
typedef WIDEST_INT widest_int;
#ifdef __TANDEM
/* Although Tandem supports "long long" there is no unsigned variant. */
typedef unsigned long u_widest_int;
#else
typedef unsigned WIDEST_INT u_widest_int;
#endif
typedef int bool_int;

#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

/*
* cvt.c - IEEE floating point formatting routines for FreeBSD
* from GNU libc-4.6.27. Modified to be thread safe.
*/

/*
* ap_ecvt converts to decimal
* the number of digits is specified by ndigit
* decpt is set to the position of the decimal point
* sign is set to 0 for positive, 1 for negative
*/

#define NDIG 80

/* buf must have at least NDIG bytes */
static char *ap_cvt(double arg, int ndigits, int *decpt, int *sign, int eflag, char *buf)
{
register int r2;
double fi, fj;
register char *p, *p1;

if (ndigits >= NDIG - 1)
ndigits = NDIG - 2;
r2 = 0;
*sign = 0;
p = &buf[0];
if (arg < 0) {
*sign = 1;
arg = -arg;
}
arg = modf(arg, &fi);
p1 = &buf[NDIG];
/*
* Do integer part
*/
if (fi != 0) {
p1 = &buf[NDIG];
while (p1 > &buf[0] && fi != 0) {
fj = modf(fi / 10, &fi);
*--p1 = (int) ((fj + .03) * 10) + '0';
r2++;
}
while (p1 < &buf[NDIG])
*p++ = *p1++;
}
else if (arg > 0) {
while ((fj = arg * 10) < 1) {
arg = fj;
r2--;
}
}
p1 = &buf[ndigits];
if (eflag == 0)
p1 += r2;
*decpt = r2;
if (p1 < &buf[0]) {
buf[0] = '\0';
return (buf);
}
while (p <= p1 && p < &buf[NDIG]) {
arg *= 10;
arg = modf(arg, &fj);
*p++ = (int) fj + '0';
}
if (p1 >= &buf[NDIG]) {
buf[NDIG - 1] = '\0';
return (buf);
}
p = p1;
*p1 += 5;
while (*p1 > '9') {
*p1 = '0';
if (p1 > buf)
++ * --p1;
else {
*p1 = '1';
(*decpt)++;
if (eflag == 0) {
if (p > buf)
*p = '0';
p++;
}
}
}
*p = '\0';
return (buf);
}

static char *ap_ecvt(double arg, int ndigits, int *decpt, int *sign, char *buf)
{
return (ap_cvt(arg, ndigits, decpt, sign, 1, buf));
}

static char *ap_fcvt(double arg, int ndigits, int *decpt, int *sign, char *buf)
{
return (ap_cvt(arg, ndigits, decpt, sign, 0, buf));
}

/*
* ap_gcvt - Floating output conversion to
* minimal length string
*/

static char *ap_gcvt(double number, int ndigit, char *buf, boolean_e altform)
{
int sign, decpt;
register char *p1, *p2;
register int i;
char buf1[NDIG];

p1 = ap_ecvt(number, ndigit, &decpt, &sign, buf1);
p2 = buf;
if (sign)
*p2++ = '-';
for (i = ndigit - 1; i > 0 && p1[i] == '0'; i--)
ndigit--;
if ((decpt >= 0 && decpt - ndigit > 4)
|| (decpt < 0 && decpt < -3)) { /* use E-style */
decpt--;
*p2++ = *p1++;
*p2++ = '.';
for (i = 1; i < ndigit; i++)
*p2++ = *p1++;
*p2++ = 'e';
if (decpt < 0) {
decpt = -decpt;
*p2++ = '-';
}
else
*p2++ = '+';
if (decpt / 100 > 0)
*p2++ = decpt / 100 + '0';
if (decpt / 10 > 0)
*p2++ = (decpt % 100) / 10 + '0';
*p2++ = decpt % 10 + '0';
}
else {
if (decpt <= 0) {
if (*p1 != '0')
*p2++ = '.';
while (decpt < 0) {
decpt++;
*p2++ = '0';
}
}
for (i = 1; i <= ndigit; i++) {
*p2++ = *p1++;
if (i == decpt)
*p2++ = '.';
}
if (ndigit < decpt) {
while (ndigit++ < decpt)
*p2++ = '0';
*p2++ = '.';
}
}
if (p2[-1] == '.' && !altform)
p2--;
*p2 = '\0';
return (buf);
}

/*
* 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(c, sp, bep, cc) \
{ \
if (sp >= bep) { \
vbuff->curpos = sp; \
if (flush_func(vbuff)) \
return -1; \
sp = vbuff->curpos; \
bep = vbuff->endpos; \
} \
*sp++ = (c); \
cc++; \
}

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

#define STR_TO_DEC( str, num ) \
num = NUM( *str++ ) ; \
while ( ap_isdigit( *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. We don't allow precision to be large
* enough that we continue past the start of s.
*
* NOTE: this makes use of the magic info that s is
* always based on num_buf with a size of NUM_BUF_SIZE.
*/
#define FIX_PRECISION( adjust, precision, s, s_len ) \
if ( adjust ) { \
int p = precision < NUM_BUF_SIZE - 1 ? precision : NUM_BUF_SIZE - 1; \
while ( s_len < p ) \
{ \
*--s = '0' ; \
s_len++ ; \
} \
}

/*
* Macro that does padding. The padding is done by printing
* the character ch.
*/
#define PAD( width, len, ch ) do \
{ \
INS_CHAR( ch, sp, bep, cc ) ; \
width-- ; \
} \
while ( width > 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

/*
* Convert num to its decimal format.
* Return value:
* - a pointer to a string containing the number (no sign)
* - len contains the length of the string
* - is_negative is set to TRUE or FALSE depending on the sign
* of the number (always set to FALSE if is_unsigned is TRUE)
*
* The caller provides a buffer for the string: that is the buf_end argument
* which is a pointer to the END of the buffer + 1 (i.e. if the buffer
* is declared as buf[ 100 ], buf_end should be &buf[ 100 ])
*
* Note: we have 2 versions. One is used when we need to use quads
* (conv_10_quad), the other when we don't (conv_10). We're assuming the
* latter is faster.
*/
static char *conv_10(register wide_int num, register bool_int is_unsigned,
register bool_int *is_negative, char *buf_end,
register int *len)
{
register char *p = buf_end;
register u_wide_int magnitude;

if (is_unsigned) {
magnitude = (u_wide_int) num;
*is_negative = FALSE;
}
else {
*is_negative = (num < 0);

/*
* On a 2's complement machine, negating the most negative integer
* results in a number that cannot be represented as a signed integer.
* Here is what we do to obtain the number's magnitude:
* a. add 1 to the number
* b. negate it (becomes positive)
* c. convert it to unsigned
* d. add 1
*/
if (*is_negative) {
wide_int t = num + 1;

magnitude = ((u_wide_int) -t) + 1;
}
else
magnitude = (u_wide_int) num;
}

/*
* We use a do-while loop so that we write at least 1 digit
*/
do {
register u_wide_int new_magnitude = magnitude / 10;

*--p = (char) (magnitude - new_magnitude * 10 + '0');
magnitude = new_magnitude;
}
while (magnitude);

*len = buf_end - p;
return (p);
}

static char *conv_10_quad(widest_int num, register bool_int is_unsigned,
register bool_int *is_negative, char *buf_end,
register int *len)
{
register char *p = buf_end;
u_widest_int magnitude;

/*
* We see if we can use the faster non-quad version by checking the
* number against the largest long value it can be. If <=, we
* punt to the quicker version.
*/
if ((num <= ULONG_MAX && is_unsigned) || (num <= LONG_MAX && !is_unsigned))
return(conv_10( (wide_int)num, is_unsigned, is_negative,
buf_end, len));

if (is_unsigned) {
magnitude = (u_widest_int) num;
*is_negative = FALSE;
}
else {
*is_negative = (num < 0);

/*
* On a 2's complement machine, negating the most negative integer
* results in a number that cannot be represented as a signed integer.
* Here is what we do to obtain the number's magnitude:
* a. add 1 to the number
* b. negate it (becomes positive)
* c. convert it to unsigned
* d. add 1
*/
if (*is_negative) {
widest_int t = num + 1;

magnitude = ((u_widest_int) -t) + 1;
}
else
magnitude = (u_widest_int) num;
}

/*
* We use a do-while loop so that we write at least 1 digit
*/
do {
u_widest_int new_magnitude = magnitude / 10;

*--p = (char) (magnitude - new_magnitude * 10 + '0');
magnitude = new_magnitude;
}
while (magnitude);

*len = buf_end - p;
return (p);
}

static char *conv_in_addr(struct in_addr *ia, char *buf_end, int *len)
{
unsigned addr = ntohl(ia->s_addr);
char *p = buf_end;
bool_int is_negative;
int sub_len;

p = conv_10((addr & 0x000000FF) , TRUE, &is_negative, p, &sub_len);
*--p = '.';
p = conv_10((addr & 0x0000FF00) >> 8, TRUE, &is_negative, p, &sub_len);
*--p = '.';
p = conv_10((addr & 0x00FF0000) >> 16, TRUE, &is_negative, p, &sub_len);
*--p = '.';
p = conv_10((addr & 0xFF000000) >> 24, TRUE, &is_negative, p, &sub_len);

*len = buf_end - p;
return (p);
}

static char *conv_sockaddr_in(struct sockaddr_in *si, char *buf_end, int *len)
{
char *p = buf_end;
bool_int is_negative;
int sub_len;

p = conv_10(ntohs(si->sin_port), TRUE, &is_negative, p, &sub_len);
*--p = ':';
p = conv_in_addr(&si->sin_addr, p, &sub_len);

*len = buf_end - p;
return (p);
}

/*
* Convert a floating point number to a string formats 'f', 'e' or 'E'.
* The result is placed in buf, and len denotes the length of the string
* The sign is returned in the is_negative argument (and is not placed
* in buf).
*/
static char *conv_fp(register char format, register double num,
boolean_e add_dp, int precision, bool_int *is_negative,
char *buf, int *len)
{
register char *s = buf;
register char *p;
int decimal_point;
char buf1[NDIG];

if (format == 'f')
p = ap_fcvt(num, precision, &decimal_point, is_negative, buf1);
else /* either e or E format */
p = ap_ecvt(num, precision + 1, &decimal_point, is_negative, buf1);

/*
* Check for Infinity and NaN
*/
if (ap_isalpha(*p)) {
*len = strlen(strcpy(buf, p));
*is_negative = FALSE;
return (buf);
}

if (format == 'f') {
if (decimal_point <= 0) {
*s++ = '0';
if (precision > 0) {
*s++ = '.';
while (decimal_point++ < 0)
*s++ = '0';
}
else if (add_dp)
*s++ = '.';
}
else {
while (decimal_point-- > 0)
*s++ = *p++;
if (precision > 0 || add_dp)
*s++ = '.';
}
}
else {
*s++ = *p++;
if (precision > 0 || add_dp)
*s++ = '.';
}

/*
* copy the rest of p, the NUL is NOT copied
*/
while (*p)
*s++ = *p++;

if (format != 'f') {
char temp[EXPONENT_LENGTH]; /* for exponent conversion */
int t_len;
bool_int exponent_is_negative;

*s++ = format; /* either e or E */
decimal_point--;
if (decimal_point != 0) {
p = conv_10((wide_int) decimal_point, FALSE, &exponent_is_negative,
&temp[EXPONENT_LENGTH], &t_len);
*s++ = exponent_is_negative ? '-' : '+';

/*
* Make sure the exponent has at least 2 digits
*/
if (t_len == 1)
*s++ = '0';
while (t_len--)
*s++ = *p++;
}
else {
*s++ = '+';
*s++ = '0';
*s++ = '0';
}
}

*len = s - buf;
return (buf);
}

/*
* Convert num to a base X number where X is a power of 2. nbits determines X.
* For example, if nbits is 3, we do base 8 conversion
* Return value:
* a pointer to a string containing the number
*
* The caller provides a buffer for the string: that is the buf_end argument
* which is a pointer to the END of the buffer + 1 (i.e. if the buffer
* is declared as buf[ 100 ], buf_end should be &buf[ 100 ])
*
* As with conv_10, we have a faster version which is used when
* the number isn't quad size.
*/
static char *conv_p2(register u_wide_int num, register int nbits,
char format, char *buf_end, register int *len)
{
register int mask = (1 << nbits) - 1;
register char *p = buf_end;
static const char low_digits[] = "0123456789abcdef";
static const char upper_digits[] = "0123456789ABCDEF";
register const char *digits = (format == 'X') ? upper_digits : low_digits;

do {
*--p = digits[num & mask];
num >>= nbits;
}
while (num);

*len = buf_end - p;
return (p);
}

static char *conv_p2_quad(u_widest_int num, register int nbits,
char format, char *buf_end, register int *len)
{
register int mask = (1 << nbits) - 1;
register char *p = buf_end;
static const char low_digits[] = "0123456789abcdef";
static const char upper_digits[] = "0123456789ABCDEF";
register const char *digits = (format == 'X') ? upper_digits : low_digits;

if (num <= ULONG_MAX)
return(conv_p2( (u_wide_int)num, nbits, format, buf_end, len));

do {
*--p = digits[num & mask];
num >>= nbits;
}
while (num);

*len = buf_end - p;
return (p);
}

/*
* Do format conversion placing the output in buffer
*/
API_EXPORT(int) ap_vformatter(int (*flush_func)(ap_vformatter_buff *),
ap_vformatter_buff *vbuff, const char *fmt, va_list ap)
{
register char *sp;
register char *bep;
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;
widest_int i_quad = (widest_int) 0;
u_widest_int ui_quad;
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> */

enum var_type_enum {
IS_QUAD, IS_LONG, IS_SHORT, IS_INT
};
enum var_type_enum var_type = IS_INT;

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

sp = vbuff->curpos;
bep = vbuff->endpos;

while (*fmt) {
if (*fmt != '%') {
INS_CHAR(*fmt, sp, bep, 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 (!ap_islower(*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 (ap_isdigit(*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 (ap_isdigit(*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 == 'q') {
var_type = IS_QUAD;
fmt++;
}
else if (*fmt == 'l') {
var_type = IS_LONG;
fmt++;
}
else if (*fmt == 'h') {
var_type = IS_SHORT;
fmt++;
}
else {
var_type = IS_INT;
}

/*
* 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 (var_type == IS_QUAD) {
i_quad = va_arg(ap, u_widest_int);
s = conv_10_quad(i_quad, 1, &is_negative,
&num_buf[NUM_BUF_SIZE], &s_len);
}
else {
if (var_type == IS_LONG)
i_num = (wide_int) va_arg(ap, u_wide_int);
else if (var_type == IS_SHORT)
i_num = (wide_int) (unsigned short) va_arg(ap, unsigned int);
else
i_num = (wide_int) va_arg(ap, unsigned int);
s = conv_10(i_num, 1, &is_negative,
&num_buf[NUM_BUF_SIZE], &s_len);
}
FIX_PRECISION(adjust_precision, precision, s, s_len);
break;

case 'd':
case 'i':
if (var_type == IS_QUAD) {
i_quad = va_arg(ap, widest_int);
s = conv_10_quad(i_quad, 0, &is_negative,
&num_buf[NUM_BUF_SIZE], &s_len);
}
else {
if (var_type == IS_LONG)
i_num = (wide_int) va_arg(ap, wide_int);
else if (var_type == IS_SHORT)
i_num = (wide_int) (short) va_arg(ap, int);
else
i_num = (wide_int) va_arg(ap, int);
s = conv_10(i_num, 0, &is_negative,
&num_buf[NUM_BUF_SIZE], &s_len);
}
FIX_PRECISION(adjust_precision, precision, s, s_len);

if (is_negative)
prefix_char = '-';
else if (print_sign)
prefix_char = '+';
else if (print_blank)
prefix_char = ' ';
break;

case 'o':
if (var_type == IS_QUAD) {
ui_quad = va_arg(ap, u_widest_int);
s = conv_p2_quad(ui_quad, 3, *fmt,
&num_buf[NUM_BUF_SIZE], &s_len);
}
else {
if (var_type == IS_LONG)
ui_num = (u_wide_int) va_arg(ap, u_wide_int);
else if (var_type == IS_SHORT)
ui_num = (u_wide_int) (unsigned short) va_arg(ap, unsigned int);
else
ui_num = (u_wide_int) va_arg(ap, unsigned int);
s = 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 (var_type == IS_QUAD) {
ui_quad = va_arg(ap, u_widest_int);
s = conv_p2_quad(ui_quad, 4, *fmt,
&num_buf[NUM_BUF_SIZE], &s_len);
}
else {
if (var_type == IS_LONG)
ui_num = (u_wide_int) va_arg(ap, u_wide_int);
else if (var_type == IS_SHORT)
ui_num = (u_wide_int) (unsigned short) va_arg(ap, unsigned int);
else
ui_num = (u_wide_int) va_arg(ap, unsigned int);
s = 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);
/*
* * We use &num_buf[ 1 ], so that we have room for the sign
*/
#ifdef HAVE_ISNAN
if (isnan(fp_num)) {
s = "nan";
s_len = 3;
}
else
#endif
#ifdef HAVE_ISINF
if (isinf(fp_num)) {
s = "inf";
s_len = 3;
}
else
#endif
{
s = 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_gcvt(va_arg(ap, double), precision, &num_buf[1],
alternate_form);
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++] = '.';
s[s_len] = '\0'; /* delimit for following strchr() */
}
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':
if (var_type == IS_QUAD)
*(va_arg(ap, widest_int *)) = cc;
else if (var_type == IS_LONG)
*(va_arg(ap, long *)) = cc;
else if (var_type == IS_SHORT)
*(va_arg(ap, short *)) = cc;
else
*(va_arg(ap, int *)) = cc;
break;

/*
* This is where we extend the printf format, with a second
* type specifier
*/
case 'p':
switch(*++fmt) {
/*
* If the pointer size is equal to or smaller than the size
* of the largest unsigned int, we convert the pointer to a
* hex number, otherwise we print "%p" to indicate that we
* don't handle "%p".
*/
case 'p':
#ifdef AP_VOID_P_IS_QUAD
if (sizeof(void *) <= sizeof(u_widest_int)) {
ui_quad = (u_widest_int) va_arg(ap, void *);
s = conv_p2_quad(ui_quad, 4, 'x',
&num_buf[NUM_BUF_SIZE], &s_len);
}
#else
if (sizeof(void *) <= sizeof(u_wide_int)) {
ui_num = (u_wide_int) va_arg(ap, void *);
s = conv_p2(ui_num, 4, 'x',
&num_buf[NUM_BUF_SIZE], &s_len);
}
#endif
else {
s = "%p";
s_len = 2;
prefix_char = NUL;
}
pad_char = ' ';
break;

/* print a struct sockaddr_in as a.b.c.d:port */
case 'I':
{
struct sockaddr_in *si;

si = va_arg(ap, struct sockaddr_in *);
if (si != NULL) {
s = conv_sockaddr_in(si, &num_buf[NUM_BUF_SIZE], &s_len);
if (adjust_precision && precision < s_len)
s_len = precision;
}
else {
s = S_NULL;
s_len = S_NULL_LEN;
}
pad_char = ' ';
}
break;

/* print a struct in_addr as a.b.c.d */
case 'A':
{
struct in_addr *ia;

ia = va_arg(ap, struct in_addr *);
if (ia != NULL) {
s = conv_in_addr(ia, &num_buf[NUM_BUF_SIZE], &s_len);
if (adjust_precision && precision < s_len)
s_len = precision;
}
else {
s = S_NULL;
s_len = S_NULL_LEN;
}
pad_char = ' ';
}
break;

case NUL:
/* if %p ends the string, oh well ignore it */
continue;

default:
s = "bogus %p";
s_len = 8;
prefix_char = NUL;
break;
}
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 != S_NULL && s != char_buf) {
*--s = prefix_char;
s_len++;
}

if (adjust_width && adjust == RIGHT && min_width > s_len) {
if (pad_char == '0' && prefix_char != NUL) {
INS_CHAR(*s, sp, bep, cc);
s++;
s_len--;
min_width--;
}
PAD(min_width, s_len, pad_char);
}

/*
* Print the string s.
*/
for (i = s_len; i != 0; i--) {
INS_CHAR(*s, sp, bep, cc);
s++;
}

if (adjust_width && adjust == LEFT && min_width > s_len)
PAD(min_width, s_len, pad_char);
}
fmt++;
}
vbuff->curpos = sp;

return cc;
}

static int snprintf_flush(ap_vformatter_buff *vbuff)
{
/* if the buffer fills we have to abort immediately, there is no way
* to "flush" an ap_snprintf... there's nowhere to flush it to.
*/
return -1;
}

API_EXPORT_NONSTD(int) ap_snprintf(char *buf, size_t len, const char *format,...)
{
int cc;
va_list ap;
ap_vformatter_buff vbuff;

if (len == 0)
return 0;

/* save one byte for nul terminator */
vbuff.curpos = buf;
vbuff.endpos = buf + len - 1;
va_start(ap, format);
cc = ap_vformatter(snprintf_flush, &vbuff, format, ap);
va_end(ap);
*vbuff.curpos = '\0';
return (cc == -1) ? len : cc;
}

API_EXPORT(int) ap_vsnprintf(char *buf, size_t len, const char *format,
va_list ap)
{
int cc;
ap_vformatter_buff vbuff;

if (len == 0)
return 0;

/* save one byte for nul terminator */
vbuff.curpos = buf;
vbuff.endpos = buf + len - 1;
cc = ap_vformatter(snprintf_flush, &vbuff, format, ap);
*vbuff.curpos = '\0';
return (cc == -1) ? len : cc;
}