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curl/lib/mprintf.c
Tobias Stoeckmann 8829703b5a mprintf: Fix stack overflows 
Stack overflows can occur with precisions for integers and floats.

Proof of concepts:
- curl_mprintf("%d, %.*1$d", 500, 1);
- curl_mprintf("%d, %+0500.*1$f", 500, 1);

Ideally, compile with -fsanitize=address which makes this undefined
behavior a bit more defined for debug purposes.

The format strings are valid. The overflows occur due to invalid
arguments. If these arguments are variables with contents controlled
by an attacker, the function's stack can be corrupted.

Also see CVE-2016-9586 which partially fixed the float aspect.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>

Closes https://github.com/curl/curl/pull/5722
2020-07-27 03:43:00 -04:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1999 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
*
* Purpose:
* A merge of Bjorn Reese's format() function and Daniel's dsprintf()
* 1.0. A full blooded printf() clone with full support for <num>$
* everywhere (parameters, widths and precisions) including variabled
* sized parameters (like doubles, long longs, long doubles and even
* void * in 64-bit architectures).
*
* Current restrictions:
* - Max 128 parameters
* - No 'long double' support.
*
* If you ever want truly portable and good *printf() clones, the project that
* took on from here is named 'Trio' and you find more details on the trio web
* page at https://daniel.haxx.se/projects/trio/
*/
#include "curl_setup.h"
#include "dynbuf.h"
#include <curl/mprintf.h>
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
/*
* If SIZEOF_SIZE_T has not been defined, default to the size of long.
*/
#ifdef HAVE_LONGLONG
# define LONG_LONG_TYPE long long
# define HAVE_LONG_LONG_TYPE
#else
# if defined(_MSC_VER) && (_MSC_VER >= 900) && (_INTEGRAL_MAX_BITS >= 64)
# define LONG_LONG_TYPE __int64
# define HAVE_LONG_LONG_TYPE
# else
# undef LONG_LONG_TYPE
# undef HAVE_LONG_LONG_TYPE
# endif
#endif
/*
* Non-ANSI integer extensions
*/
#if (defined(__BORLANDC__) && (__BORLANDC__ >= 0x520)) || \
(defined(__WATCOMC__) && defined(__386__)) || \
(defined(__POCC__) && defined(_MSC_VER)) || \
(defined(_WIN32_WCE)) || \
(defined(__MINGW32__)) || \
(defined(_MSC_VER) && (_MSC_VER >= 900) && (_INTEGRAL_MAX_BITS >= 64))
# define MP_HAVE_INT_EXTENSIONS
#endif
/*
* Max integer data types that mprintf.c is capable
*/
#ifdef HAVE_LONG_LONG_TYPE
# define mp_intmax_t LONG_LONG_TYPE
# define mp_uintmax_t unsigned LONG_LONG_TYPE
#else
# define mp_intmax_t long
# define mp_uintmax_t unsigned long
#endif
#define BUFFSIZE 326 /* buffer for long-to-str and float-to-str calcs, should
fit negative DBL_MAX (317 letters) */
#define MAX_PARAMETERS 128 /* lame static limit */
#ifdef __AMIGA__
# undef FORMAT_INT
#endif
/* Lower-case digits. */
static const char lower_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
/* Upper-case digits. */
static const char upper_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
#define OUTCHAR(x) \
do{ \
if(stream((unsigned char)(x), (FILE *)data) != -1) \
done++; \
else \
return done; /* return immediately on failure */ \
} while(0)
/* Data type to read from the arglist */
typedef enum {
FORMAT_UNKNOWN = 0,
FORMAT_STRING,
FORMAT_PTR,
FORMAT_INT,
FORMAT_INTPTR,
FORMAT_LONG,
FORMAT_LONGLONG,
FORMAT_DOUBLE,
FORMAT_LONGDOUBLE,
FORMAT_WIDTH /* For internal use */
} FormatType;
/* conversion and display flags */
enum {
FLAGS_NEW = 0,
FLAGS_SPACE = 1<<0,
FLAGS_SHOWSIGN = 1<<1,
FLAGS_LEFT = 1<<2,
FLAGS_ALT = 1<<3,
FLAGS_SHORT = 1<<4,
FLAGS_LONG = 1<<5,
FLAGS_LONGLONG = 1<<6,
FLAGS_LONGDOUBLE = 1<<7,
FLAGS_PAD_NIL = 1<<8,
FLAGS_UNSIGNED = 1<<9,
FLAGS_OCTAL = 1<<10,
FLAGS_HEX = 1<<11,
FLAGS_UPPER = 1<<12,
FLAGS_WIDTH = 1<<13, /* '*' or '*<num>$' used */
FLAGS_WIDTHPARAM = 1<<14, /* width PARAMETER was specified */
FLAGS_PREC = 1<<15, /* precision was specified */
FLAGS_PRECPARAM = 1<<16, /* precision PARAMETER was specified */
FLAGS_CHAR = 1<<17, /* %c story */
FLAGS_FLOATE = 1<<18, /* %e or %E */
FLAGS_FLOATG = 1<<19 /* %g or %G */
};
struct va_stack {
FormatType type;
int flags;
long width; /* width OR width parameter number */
long precision; /* precision OR precision parameter number */
union {
char *str;
void *ptr;
union {
mp_intmax_t as_signed;
mp_uintmax_t as_unsigned;
} num;
double dnum;
} data;
};
struct nsprintf {
char *buffer;
size_t length;
size_t max;
};
struct asprintf {
struct dynbuf b;
bool fail; /* if an alloc has failed and thus the output is not the complete
data */
};
static long dprintf_DollarString(char *input, char **end)
{
int number = 0;
while(ISDIGIT(*input)) {
if(number < MAX_PARAMETERS) {
number *= 10;
number += *input - '0';
}
input++;
}
if(number <= MAX_PARAMETERS && ('$' == *input)) {
*end = ++input;
return number;
}
return 0;
}
static bool dprintf_IsQualifierNoDollar(const char *fmt)
{
#if defined(MP_HAVE_INT_EXTENSIONS)
if(!strncmp(fmt, "I32", 3) || !strncmp(fmt, "I64", 3)) {
return TRUE;
}
#endif
switch(*fmt) {
case '-': case '+': case ' ': case '#': case '.':
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'h': case 'l': case 'L': case 'z': case 'q':
case '*': case 'O':
#if defined(MP_HAVE_INT_EXTENSIONS)
case 'I':
#endif
return TRUE;
default:
return FALSE;
}
}
/******************************************************************
*
* Pass 1:
* Create an index with the type of each parameter entry and its
* value (may vary in size)
*
* Returns zero on success.
*
******************************************************************/
static int dprintf_Pass1(const char *format, struct va_stack *vto,
char **endpos, va_list arglist)
{
char *fmt = (char *)format;
int param_num = 0;
long this_param;
long width;
long precision;
int flags;
long max_param = 0;
long i;
while(*fmt) {
if(*fmt++ == '%') {
if(*fmt == '%') {
fmt++;
continue; /* while */
}
flags = FLAGS_NEW;
/* Handle the positional case (N$) */
param_num++;
this_param = dprintf_DollarString(fmt, &fmt);
if(0 == this_param)
/* we got no positional, get the next counter */
this_param = param_num;
if(this_param > max_param)
max_param = this_param;
/*
* The parameter with number 'i' should be used. Next, we need
* to get SIZE and TYPE of the parameter. Add the information
* to our array.
*/
width = 0;
precision = 0;
/* Handle the flags */
while(dprintf_IsQualifierNoDollar(fmt)) {
#if defined(MP_HAVE_INT_EXTENSIONS)
if(!strncmp(fmt, "I32", 3)) {
flags |= FLAGS_LONG;
fmt += 3;
}
else if(!strncmp(fmt, "I64", 3)) {
flags |= FLAGS_LONGLONG;
fmt += 3;
}
else
#endif
switch(*fmt++) {
case ' ':
flags |= FLAGS_SPACE;
break;
case '+':
flags |= FLAGS_SHOWSIGN;
break;
case '-':
flags |= FLAGS_LEFT;
flags &= ~FLAGS_PAD_NIL;
break;
case '#':
flags |= FLAGS_ALT;
break;
case '.':
if('*' == *fmt) {
/* The precision is picked from a specified parameter */
flags |= FLAGS_PRECPARAM;
fmt++;
param_num++;
i = dprintf_DollarString(fmt, &fmt);
if(i)
precision = i;
else
precision = param_num;
if(precision > max_param)
max_param = precision;
}
else {
flags |= FLAGS_PREC;
precision = strtol(fmt, &fmt, 10);
}
break;
case 'h':
flags |= FLAGS_SHORT;
break;
#if defined(MP_HAVE_INT_EXTENSIONS)
case 'I':
#if (SIZEOF_CURL_OFF_T > SIZEOF_LONG)
flags |= FLAGS_LONGLONG;
#else
flags |= FLAGS_LONG;
#endif
break;
#endif
case 'l':
if(flags & FLAGS_LONG)
flags |= FLAGS_LONGLONG;
else
flags |= FLAGS_LONG;
break;
case 'L':
flags |= FLAGS_LONGDOUBLE;
break;
case 'q':
flags |= FLAGS_LONGLONG;
break;
case 'z':
/* the code below generates a warning if -Wunreachable-code is
used */
#if (SIZEOF_SIZE_T > SIZEOF_LONG)
flags |= FLAGS_LONGLONG;
#else
flags |= FLAGS_LONG;
#endif
break;
case 'O':
#if (SIZEOF_CURL_OFF_T > SIZEOF_LONG)
flags |= FLAGS_LONGLONG;
#else
flags |= FLAGS_LONG;
#endif
break;
case '0':
if(!(flags & FLAGS_LEFT))
flags |= FLAGS_PAD_NIL;
/* FALLTHROUGH */
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
flags |= FLAGS_WIDTH;
width = strtol(fmt-1, &fmt, 10);
break;
case '*': /* Special case */
flags |= FLAGS_WIDTHPARAM;
param_num++;
i = dprintf_DollarString(fmt, &fmt);
if(i)
width = i;
else
width = param_num;
if(width > max_param)
max_param = width;
break;
case '\0':
fmt--;
default:
break;
}
} /* switch */
/* Handle the specifier */
i = this_param - 1;
if((i < 0) || (i >= MAX_PARAMETERS))
/* out of allowed range */
return 1;
switch (*fmt) {
case 'S':
flags |= FLAGS_ALT;
/* FALLTHROUGH */
case 's':
vto[i].type = FORMAT_STRING;
break;
case 'n':
vto[i].type = FORMAT_INTPTR;
break;
case 'p':
vto[i].type = FORMAT_PTR;
break;
case 'd': case 'i':
vto[i].type = FORMAT_INT;
break;
case 'u':
vto[i].type = FORMAT_INT;
flags |= FLAGS_UNSIGNED;
break;
case 'o':
vto[i].type = FORMAT_INT;
flags |= FLAGS_OCTAL;
break;
case 'x':
vto[i].type = FORMAT_INT;
flags |= FLAGS_HEX|FLAGS_UNSIGNED;
break;
case 'X':
vto[i].type = FORMAT_INT;
flags |= FLAGS_HEX|FLAGS_UPPER|FLAGS_UNSIGNED;
break;
case 'c':
vto[i].type = FORMAT_INT;
flags |= FLAGS_CHAR;
break;
case 'f':
vto[i].type = FORMAT_DOUBLE;
break;
case 'e':
vto[i].type = FORMAT_DOUBLE;
flags |= FLAGS_FLOATE;
break;
case 'E':
vto[i].type = FORMAT_DOUBLE;
flags |= FLAGS_FLOATE|FLAGS_UPPER;
break;
case 'g':
vto[i].type = FORMAT_DOUBLE;
flags |= FLAGS_FLOATG;
break;
case 'G':
vto[i].type = FORMAT_DOUBLE;
flags |= FLAGS_FLOATG|FLAGS_UPPER;
break;
default:
vto[i].type = FORMAT_UNKNOWN;
break;
} /* switch */
vto[i].flags = flags;
vto[i].width = width;
vto[i].precision = precision;
if(flags & FLAGS_WIDTHPARAM) {
/* we have the width specified from a parameter, so we make that
parameter's info setup properly */
long k = width - 1;
if((k < 0) || (k >= MAX_PARAMETERS))
/* out of allowed range */
return 1;
vto[i].width = k;
vto[k].type = FORMAT_WIDTH;
vto[k].flags = FLAGS_NEW;
/* can't use width or precision of width! */
vto[k].width = 0;
vto[k].precision = 0;
}
if(flags & FLAGS_PRECPARAM) {
/* we have the precision specified from a parameter, so we make that
parameter's info setup properly */
long k = precision - 1;
if((k < 0) || (k >= MAX_PARAMETERS))
/* out of allowed range */
return 1;
vto[i].precision = k;
vto[k].type = FORMAT_WIDTH;
vto[k].flags = FLAGS_NEW;
/* can't use width or precision of width! */
vto[k].width = 0;
vto[k].precision = 0;
}
*endpos++ = fmt + ((*fmt == '\0') ? 0 : 1); /* end of this sequence */
}
}
/* Read the arg list parameters into our data list */
for(i = 0; i<max_param; i++) {
/* Width/precision arguments must be read before the main argument
they are attached to */
if(vto[i].flags & FLAGS_WIDTHPARAM) {
vto[vto[i].width].data.num.as_signed =
(mp_intmax_t)va_arg(arglist, int);
}
if(vto[i].flags & FLAGS_PRECPARAM) {
vto[vto[i].precision].data.num.as_signed =
(mp_intmax_t)va_arg(arglist, int);
}
switch(vto[i].type) {
case FORMAT_STRING:
vto[i].data.str = va_arg(arglist, char *);
break;
case FORMAT_INTPTR:
case FORMAT_UNKNOWN:
case FORMAT_PTR:
vto[i].data.ptr = va_arg(arglist, void *);
break;
case FORMAT_INT:
#ifdef HAVE_LONG_LONG_TYPE
if((vto[i].flags & FLAGS_LONGLONG) && (vto[i].flags & FLAGS_UNSIGNED))
vto[i].data.num.as_unsigned =
(mp_uintmax_t)va_arg(arglist, mp_uintmax_t);
else if(vto[i].flags & FLAGS_LONGLONG)
vto[i].data.num.as_signed =
(mp_intmax_t)va_arg(arglist, mp_intmax_t);
else
#endif
{
if((vto[i].flags & FLAGS_LONG) && (vto[i].flags & FLAGS_UNSIGNED))
vto[i].data.num.as_unsigned =
(mp_uintmax_t)va_arg(arglist, unsigned long);
else if(vto[i].flags & FLAGS_LONG)
vto[i].data.num.as_signed =
(mp_intmax_t)va_arg(arglist, long);
else if(vto[i].flags & FLAGS_UNSIGNED)
vto[i].data.num.as_unsigned =
(mp_uintmax_t)va_arg(arglist, unsigned int);
else
vto[i].data.num.as_signed =
(mp_intmax_t)va_arg(arglist, int);
}
break;
case FORMAT_DOUBLE:
vto[i].data.dnum = va_arg(arglist, double);
break;
case FORMAT_WIDTH:
/* Argument has been read. Silently convert it into an integer
* for later use
*/
vto[i].type = FORMAT_INT;
break;
default:
break;
}
}
return 0;
}
static int dprintf_formatf(
void *data, /* untouched by format(), just sent to the stream() function in
the second argument */
/* function pointer called for each output character */
int (*stream)(int, FILE *),
const char *format, /* %-formatted string */
va_list ap_save) /* list of parameters */
{
/* Base-36 digits for numbers. */
const char *digits = lower_digits;
/* Pointer into the format string. */
char *f;
/* Number of characters written. */
int done = 0;
long param; /* current parameter to read */
long param_num = 0; /* parameter counter */
struct va_stack vto[MAX_PARAMETERS];
char *endpos[MAX_PARAMETERS];
char **end;
char work[BUFFSIZE];
struct va_stack *p;
/* 'workend' points to the final buffer byte position, but with an extra
byte as margin to avoid the (false?) warning Coverity gives us
otherwise */
char *workend = &work[sizeof(work) - 2];
/* Do the actual %-code parsing */
if(dprintf_Pass1(format, vto, endpos, ap_save))
return -1;
end = &endpos[0]; /* the initial end-position from the list dprintf_Pass1()
created for us */
f = (char *)format;
while(*f != '\0') {
/* Format spec modifiers. */
int is_alt;
/* Width of a field. */
long width;
/* Precision of a field. */
long prec;
/* Decimal integer is negative. */
int is_neg;
/* Base of a number to be written. */
unsigned long base;
/* Integral values to be written. */
mp_uintmax_t num;
/* Used to convert negative in positive. */
mp_intmax_t signed_num;
char *w;
if(*f != '%') {
/* This isn't a format spec, so write everything out until the next one
OR end of string is reached. */
do {
OUTCHAR(*f);
} while(*++f && ('%' != *f));
continue;
}
++f;
/* Check for "%%". Note that although the ANSI standard lists
'%' as a conversion specifier, it says "The complete format
specification shall be `%%'," so we can avoid all the width
and precision processing. */
if(*f == '%') {
++f;
OUTCHAR('%');
continue;
}
/* If this is a positional parameter, the position must follow immediately
after the %, thus create a %<num>$ sequence */
param = dprintf_DollarString(f, &f);
if(!param)
param = param_num;
else
--param;
param_num++; /* increase this always to allow "%2$s %1$s %s" and then the
third %s will pick the 3rd argument */
p = &vto[param];
/* pick up the specified width */
if(p->flags & FLAGS_WIDTHPARAM) {
width = (long)vto[p->width].data.num.as_signed;
param_num++; /* since the width is extracted from a parameter, we
must skip that to get to the next one properly */
if(width < 0) {
/* "A negative field width is taken as a '-' flag followed by a
positive field width." */
width = -width;
p->flags |= FLAGS_LEFT;
p->flags &= ~FLAGS_PAD_NIL;
}
}
else
width = p->width;
/* pick up the specified precision */
if(p->flags & FLAGS_PRECPARAM) {
prec = (long)vto[p->precision].data.num.as_signed;
param_num++; /* since the precision is extracted from a parameter, we
must skip that to get to the next one properly */
if(prec < 0)
/* "A negative precision is taken as if the precision were
omitted." */
prec = -1;
}
else if(p->flags & FLAGS_PREC)
prec = p->precision;
else
prec = -1;
is_alt = (p->flags & FLAGS_ALT) ? 1 : 0;
switch(p->type) {
case FORMAT_INT:
num = p->data.num.as_unsigned;
if(p->flags & FLAGS_CHAR) {
/* Character. */
if(!(p->flags & FLAGS_LEFT))
while(--width > 0)
OUTCHAR(' ');
OUTCHAR((char) num);
if(p->flags & FLAGS_LEFT)
while(--width > 0)
OUTCHAR(' ');
break;
}
if(p->flags & FLAGS_OCTAL) {
/* Octal unsigned integer. */
base = 8;
goto unsigned_number;
}
else if(p->flags & FLAGS_HEX) {
/* Hexadecimal unsigned integer. */
digits = (p->flags & FLAGS_UPPER)? upper_digits : lower_digits;
base = 16;
goto unsigned_number;
}
else if(p->flags & FLAGS_UNSIGNED) {
/* Decimal unsigned integer. */
base = 10;
goto unsigned_number;
}
/* Decimal integer. */
base = 10;
is_neg = (p->data.num.as_signed < (mp_intmax_t)0) ? 1 : 0;
if(is_neg) {
/* signed_num might fail to hold absolute negative minimum by 1 */
signed_num = p->data.num.as_signed + (mp_intmax_t)1;
signed_num = -signed_num;
num = (mp_uintmax_t)signed_num;
num += (mp_uintmax_t)1;
}
goto number;
unsigned_number:
/* Unsigned number of base BASE. */
is_neg = 0;
number:
/* Number of base BASE. */
/* Supply a default precision if none was given. */
if(prec == -1)
prec = 1;
/* Put the number in WORK. */
w = workend;
while(num > 0) {
*w-- = digits[num % base];
num /= base;
}
width -= (long)(workend - w);
prec -= (long)(workend - w);
if(is_alt && base == 8 && prec <= 0) {
*w-- = '0';
--width;
}
if(prec > 0) {
width -= prec;
while(prec-- > 0 && w >= work)
*w-- = '0';
}
if(is_alt && base == 16)
width -= 2;
if(is_neg || (p->flags & FLAGS_SHOWSIGN) || (p->flags & FLAGS_SPACE))
--width;
if(!(p->flags & FLAGS_LEFT) && !(p->flags & FLAGS_PAD_NIL))
while(width-- > 0)
OUTCHAR(' ');
if(is_neg)
OUTCHAR('-');
else if(p->flags & FLAGS_SHOWSIGN)
OUTCHAR('+');
else if(p->flags & FLAGS_SPACE)
OUTCHAR(' ');
if(is_alt && base == 16) {
OUTCHAR('0');
if(p->flags & FLAGS_UPPER)
OUTCHAR('X');
else
OUTCHAR('x');
}
if(!(p->flags & FLAGS_LEFT) && (p->flags & FLAGS_PAD_NIL))
while(width-- > 0)
OUTCHAR('0');
/* Write the number. */
while(++w <= workend) {
OUTCHAR(*w);
}
if(p->flags & FLAGS_LEFT)
while(width-- > 0)
OUTCHAR(' ');
break;
case FORMAT_STRING:
/* String. */
{
static const char null[] = "(nil)";
const char *str;
size_t len;
str = (char *) p->data.str;
if(str == NULL) {
/* Write null[] if there's space. */
if(prec == -1 || prec >= (long) sizeof(null) - 1) {
str = null;
len = sizeof(null) - 1;
/* Disable quotes around (nil) */
p->flags &= (~FLAGS_ALT);
}
else {
str = "";
len = 0;
}
}
else if(prec != -1)
len = (size_t)prec;
else
len = strlen(str);
width -= (len > LONG_MAX) ? LONG_MAX : (long)len;
if(p->flags & FLAGS_ALT)
OUTCHAR('"');
if(!(p->flags&FLAGS_LEFT))
while(width-- > 0)
OUTCHAR(' ');
for(; len && *str; len--)
OUTCHAR(*str++);
if(p->flags&FLAGS_LEFT)
while(width-- > 0)
OUTCHAR(' ');
if(p->flags & FLAGS_ALT)
OUTCHAR('"');
}
break;
case FORMAT_PTR:
/* Generic pointer. */
{
void *ptr;
ptr = (void *) p->data.ptr;
if(ptr != NULL) {
/* If the pointer is not NULL, write it as a %#x spec. */
base = 16;
digits = (p->flags & FLAGS_UPPER)? upper_digits : lower_digits;
is_alt = 1;
num = (size_t) ptr;
is_neg = 0;
goto number;
}
else {
/* Write "(nil)" for a nil pointer. */
static const char strnil[] = "(nil)";
const char *point;
width -= (long)(sizeof(strnil) - 1);
if(p->flags & FLAGS_LEFT)
while(width-- > 0)
OUTCHAR(' ');
for(point = strnil; *point != '\0'; ++point)
OUTCHAR(*point);
if(! (p->flags & FLAGS_LEFT))
while(width-- > 0)
OUTCHAR(' ');
}
}
break;
case FORMAT_DOUBLE:
{
char formatbuf[32]="%";
char *fptr = &formatbuf[1];
size_t left = sizeof(formatbuf)-strlen(formatbuf);
int len;
width = -1;
if(p->flags & FLAGS_WIDTH)
width = p->width;
else if(p->flags & FLAGS_WIDTHPARAM)
width = (long)vto[p->width].data.num.as_signed;
prec = -1;
if(p->flags & FLAGS_PREC)
prec = p->precision;
else if(p->flags & FLAGS_PRECPARAM)
prec = (long)vto[p->precision].data.num.as_signed;
if(p->flags & FLAGS_LEFT)
*fptr++ = '-';
if(p->flags & FLAGS_SHOWSIGN)
*fptr++ = '+';
if(p->flags & FLAGS_SPACE)
*fptr++ = ' ';
if(p->flags & FLAGS_ALT)
*fptr++ = '#';
*fptr = 0;
if(width >= 0) {
if(width >= (long)sizeof(work))
width = sizeof(work)-1;
/* RECURSIVE USAGE */
len = curl_msnprintf(fptr, left, "%ld", width);
fptr += len;
left -= len;
}
if(prec >= 0) {
/* for each digit in the integer part, we can have one less
precision */
size_t maxprec = sizeof(work) - 2;
double val = p->data.dnum;
if(width > 0 && prec <= width)
maxprec -= width;
while(val >= 10.0) {
val /= 10;
maxprec--;
}
if(prec > (long)maxprec)
prec = (long)maxprec-1;
if(prec < 0)
prec = 0;
/* RECURSIVE USAGE */
len = curl_msnprintf(fptr, left, ".%ld", prec);
fptr += len;
}
if(p->flags & FLAGS_LONG)
*fptr++ = 'l';
if(p->flags & FLAGS_FLOATE)
*fptr++ = (char)((p->flags & FLAGS_UPPER) ? 'E':'e');
else if(p->flags & FLAGS_FLOATG)
*fptr++ = (char)((p->flags & FLAGS_UPPER) ? 'G' : 'g');
else
*fptr++ = 'f';
*fptr = 0; /* and a final zero termination */
/* NOTE NOTE NOTE!! Not all sprintf implementations return number of
output characters */
(sprintf)(work, formatbuf, p->data.dnum);
DEBUGASSERT(strlen(work) <= sizeof(work));
for(fptr = work; *fptr; fptr++)
OUTCHAR(*fptr);
}
break;
case FORMAT_INTPTR:
/* Answer the count of characters written. */
#ifdef HAVE_LONG_LONG_TYPE
if(p->flags & FLAGS_LONGLONG)
*(LONG_LONG_TYPE *) p->data.ptr = (LONG_LONG_TYPE)done;
else
#endif
if(p->flags & FLAGS_LONG)
*(long *) p->data.ptr = (long)done;
else if(!(p->flags & FLAGS_SHORT))
*(int *) p->data.ptr = (int)done;
else
*(short *) p->data.ptr = (short)done;
break;
default:
break;
}
f = *end++; /* goto end of %-code */
}
return done;
}
/* fputc() look-alike */
static int addbyter(int output, FILE *data)
{
struct nsprintf *infop = (struct nsprintf *)data;
unsigned char outc = (unsigned char)output;
if(infop->length < infop->max) {
/* only do this if we haven't reached max length yet */
infop->buffer[0] = outc; /* store */
infop->buffer++; /* increase pointer */
infop->length++; /* we are now one byte larger */
return outc; /* fputc() returns like this on success */
}
return -1;
}
int curl_mvsnprintf(char *buffer, size_t maxlength, const char *format,
va_list ap_save)
{
int retcode;
struct nsprintf info;
info.buffer = buffer;
info.length = 0;
info.max = maxlength;
retcode = dprintf_formatf(&info, addbyter, format, ap_save);
if((retcode != -1) && info.max) {
/* we terminate this with a zero byte */
if(info.max == info.length)
/* we're at maximum, scrap the last letter */
info.buffer[-1] = 0;
else
info.buffer[0] = 0;
}
return retcode;
}
int curl_msnprintf(char *buffer, size_t maxlength, const char *format, ...)
{
int retcode;
va_list ap_save; /* argument pointer */
va_start(ap_save, format);
retcode = curl_mvsnprintf(buffer, maxlength, format, ap_save);
va_end(ap_save);
return retcode;
}
/* fputc() look-alike */
static int alloc_addbyter(int output, FILE *data)
{
struct asprintf *infop = (struct asprintf *)data;
unsigned char outc = (unsigned char)output;
if(Curl_dyn_addn(&infop->b, &outc, 1)) {
infop->fail = 1;
return -1; /* fail */
}
return outc; /* fputc() returns like this on success */
}
char *curl_maprintf(const char *format, ...)
{
va_list ap_save; /* argument pointer */
int retcode;
struct asprintf info;
Curl_dyn_init(&info.b, DYN_APRINTF);
info.fail = 0;
va_start(ap_save, format);
retcode = dprintf_formatf(&info, alloc_addbyter, format, ap_save);
va_end(ap_save);
if((-1 == retcode) || info.fail) {
Curl_dyn_free(&info.b);
return NULL;
}
if(Curl_dyn_len(&info.b))
return Curl_dyn_ptr(&info.b);
return strdup("");
}
char *curl_mvaprintf(const char *format, va_list ap_save)
{
int retcode;
struct asprintf info;
Curl_dyn_init(&info.b, DYN_APRINTF);
info.fail = 0;
retcode = dprintf_formatf(&info, alloc_addbyter, format, ap_save);
if((-1 == retcode) || info.fail) {
Curl_dyn_free(&info.b);
return NULL;
}
if(Curl_dyn_len(&info.b))
return Curl_dyn_ptr(&info.b);
return strdup("");
}
static int storebuffer(int output, FILE *data)
{
char **buffer = (char **)data;
unsigned char outc = (unsigned char)output;
**buffer = outc;
(*buffer)++;
return outc; /* act like fputc() ! */
}
int curl_msprintf(char *buffer, const char *format, ...)
{
va_list ap_save; /* argument pointer */
int retcode;
va_start(ap_save, format);
retcode = dprintf_formatf(&buffer, storebuffer, format, ap_save);
va_end(ap_save);
*buffer = 0; /* we terminate this with a zero byte */
return retcode;
}
int curl_mprintf(const char *format, ...)
{
int retcode;
va_list ap_save; /* argument pointer */
va_start(ap_save, format);
retcode = dprintf_formatf(stdout, fputc, format, ap_save);
va_end(ap_save);
return retcode;
}
int curl_mfprintf(FILE *whereto, const char *format, ...)
{
int retcode;
va_list ap_save; /* argument pointer */
va_start(ap_save, format);
retcode = dprintf_formatf(whereto, fputc, format, ap_save);
va_end(ap_save);
return retcode;
}
int curl_mvsprintf(char *buffer, const char *format, va_list ap_save)
{
int retcode;
retcode = dprintf_formatf(&buffer, storebuffer, format, ap_save);
*buffer = 0; /* we terminate this with a zero byte */
return retcode;
}
int curl_mvprintf(const char *format, va_list ap_save)
{
return dprintf_formatf(stdout, fputc, format, ap_save);
}
int curl_mvfprintf(FILE *whereto, const char *format, va_list ap_save)
{
return dprintf_formatf(whereto, fputc, format, ap_save);
}
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