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7e932fac94
curl/lib/mprintf.c
Viktor Szakats 03cf1c7b8c
lib: silence -Wsign-conversion in base64, strcase, mprintf 
Closes #13467
2024-04-24 23:29:30 +02:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 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.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.
*
* SPDX-License-Identifier: curl
*
*/
#include "curl_setup.h"
#include "dynbuf.h"
#include "curl_printf.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
/*
* 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 /* number of input arguments */
#define MAX_SEGMENTS 128 /* number of output segments */
#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, userp)) \
done++; \
else \
return done; /* return on failure */ \
} while(0)
/* Data type to read from the arglist */
typedef enum {
FORMAT_STRING,
FORMAT_PTR,
FORMAT_INTPTR,
FORMAT_INT,
FORMAT_LONG,
FORMAT_LONGLONG,
FORMAT_INTU,
FORMAT_LONGU,
FORMAT_LONGLONGU,
FORMAT_DOUBLE,
FORMAT_LONGDOUBLE,
FORMAT_WIDTH,
FORMAT_PRECISION
} FormatType;
/* conversion and display flags */
enum {
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>$' used */
FLAGS_WIDTHPARAM = 1<<14, /* width PARAMETER was specified */
FLAGS_PREC = 1<<15, /* precision was specified */
FLAGS_PRECPARAM = 1<<16, /* precision PARAMETER was specified */
FLAGS_CHAR = 1<<17, /* %c story */
FLAGS_FLOATE = 1<<18, /* %e or %E */
FLAGS_FLOATG = 1<<19, /* %g or %G */
FLAGS_SUBSTR = 1<<20 /* no input, only substring */
};
enum {
DOLLAR_UNKNOWN,
DOLLAR_NOPE,
DOLLAR_USE
};
/*
* Describes an input va_arg type and hold its value.
*/
struct va_input {
FormatType type; /* FormatType */
union {
char *str;
void *ptr;
mp_intmax_t nums; /* signed */
mp_uintmax_t numu; /* unsigned */
double dnum;
} val;
};
/*
* Describes an output segment.
*/
struct outsegment {
int width; /* width OR width parameter number */
int precision; /* precision OR precision parameter number */
unsigned int flags;
unsigned int input; /* input argument array index */
char *start; /* format string start to output */
size_t outlen; /* number of bytes from the format string to output */
};
struct nsprintf {
char *buffer;
size_t length;
size_t max;
};
struct asprintf {
struct dynbuf *b;
char merr;
};
/* the provided input number is 1-based but this returns the number 0-based.
returns -1 if no valid number was provided.
*/
static int dollarstring(char *input, char **end)
{
if(ISDIGIT(*input)) {
int number = 0;
do {
if(number < MAX_PARAMETERS) {
number *= 10;
number += *input - '0';
}
input++;
} while(ISDIGIT(*input));
if(number && (number <= MAX_PARAMETERS) && ('$' == *input)) {
*end = ++input;
return number - 1;
}
}
return -1;
}
/*
* Parse the format string.
*
* Create two arrays. One describes the inputs, one describes the outputs.
*
* Returns zero on success.
*/
#define PFMT_OK 0
#define PFMT_DOLLAR 1 /* bad dollar for main param */
#define PFMT_DOLLARWIDTH 2 /* bad dollar use for width */
#define PFMT_DOLLARPREC 3 /* bad dollar use for precision */
#define PFMT_MANYARGS 4 /* too many input arguments used */
#define PFMT_PREC 5 /* precision overflow */
#define PFMT_PRECMIX 6 /* bad mix of precision specifiers */
#define PFMT_WIDTH 7 /* width overflow */
#define PFMT_INPUTGAP 8 /* gap in arguments */
#define PFMT_WIDTHARG 9 /* attempted to use same arg twice, for width */
#define PFMT_PRECARG 10 /* attempted to use same arg twice, for prec */
#define PFMT_MANYSEGS 11 /* maxed out output segments */
static int parsefmt(const char *format,
struct outsegment *out,
struct va_input *in,
int *opieces,
int *ipieces, va_list arglist)
{
char *fmt = (char *)format;
int param_num = 0;
int param;
int width;
int precision;
unsigned int flags;
FormatType type;
int max_param = -1;
int i;
int ocount = 0;
unsigned char usedinput[MAX_PARAMETERS/8];
size_t outlen = 0;
struct outsegment *optr;
int use_dollar = DOLLAR_UNKNOWN;
char *start = fmt;
/* clear, set a bit for each used input */
memset(usedinput, 0, sizeof(usedinput));
while(*fmt) {
if(*fmt == '%') {
struct va_input *iptr;
bool loopit = TRUE;
fmt++;
outlen = (size_t)(fmt - start - 1);
if(*fmt == '%') {
/* this means a %% that should be output only as %. Create an output
segment. */
if(outlen) {
optr = &out[ocount++];
if(ocount > MAX_SEGMENTS)
return PFMT_MANYSEGS;
optr->input = 0;
optr->flags = FLAGS_SUBSTR;
optr->start = start;
optr->outlen = outlen;
}
start = fmt;
fmt++;
continue; /* while */
}
flags = 0;
width = precision = 0;
if(use_dollar != DOLLAR_NOPE) {
param = dollarstring(fmt, &fmt);
if(param < 0) {
if(use_dollar == DOLLAR_USE)
/* illegal combo */
return PFMT_DOLLAR;
/* we got no positional, just get the next arg */
param = -1;
use_dollar = DOLLAR_NOPE;
}
else
use_dollar = DOLLAR_USE;
}
else
param = -1;
/* Handle the flags */
while(loopit) {
switch(*fmt++) {
case ' ':
flags |= FLAGS_SPACE;
break;
case '+':
flags |= FLAGS_SHOWSIGN;
break;
case '-':
flags |= FLAGS_LEFT;
flags &= ~(unsigned int)FLAGS_PAD_NIL;
break;
case '#':
flags |= FLAGS_ALT;
break;
case '.':
if('*' == *fmt) {
/* The precision is picked from a specified parameter */
flags |= FLAGS_PRECPARAM;
fmt++;
if(use_dollar == DOLLAR_USE) {
precision = dollarstring(fmt, &fmt);
if(precision < 0)
/* illegal combo */
return PFMT_DOLLARPREC;
}
else
/* get it from the next argument */
precision = -1;
}
else {
bool is_neg = FALSE;
flags |= FLAGS_PREC;
precision = 0;
if('-' == *fmt) {
is_neg = TRUE;
fmt++;
}
while(ISDIGIT(*fmt)) {
if(precision > INT_MAX/10)
return PFMT_PREC;
precision *= 10;
precision += *fmt - '0';
fmt++;
}
if(is_neg)
precision = -precision;
}
if((flags & (FLAGS_PREC | FLAGS_PRECPARAM)) ==
(FLAGS_PREC | FLAGS_PRECPARAM))
/* it is not permitted to use both kinds of precision for the same
argument */
return PFMT_PRECMIX;
break;
case 'h':
flags |= FLAGS_SHORT;
break;
#if defined(_WIN32) || defined(_WIN32_WCE)
case 'I':
/* Non-ANSI integer extensions I32 I64 */
if((fmt[0] == '3') && (fmt[1] == '2')) {
flags |= FLAGS_LONG;
fmt += 2;
}
else if((fmt[0] == '6') && (fmt[1] == '4')) {
flags |= FLAGS_LONGLONG;
fmt += 2;
}
else {
#if (SIZEOF_CURL_OFF_T > SIZEOF_LONG)
flags |= FLAGS_LONGLONG;
#else
flags |= FLAGS_LONG;
#endif
}
break;
#endif /* _WIN32 || _WIN32_WCE */
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 = 0;
fmt--;
do {
if(width > INT_MAX/10)
return PFMT_WIDTH;
width *= 10;
width += *fmt - '0';
fmt++;
} while(ISDIGIT(*fmt));
break;
case '*': /* read width from argument list */
flags |= FLAGS_WIDTHPARAM;
if(use_dollar == DOLLAR_USE) {
width = dollarstring(fmt, &fmt);
if(width < 0)
/* illegal combo */
return PFMT_DOLLARWIDTH;
}
else
/* pick from the next argument */
width = -1;
break;
default:
loopit = FALSE;
fmt--;
break;
} /* switch */
} /* while */
switch(*fmt) {
case 'S':
flags |= FLAGS_ALT;
FALLTHROUGH();
case 's':
type = FORMAT_STRING;
break;
case 'n':
type = FORMAT_INTPTR;
break;
case 'p':
type = FORMAT_PTR;
break;
case 'd':
case 'i':
if(flags & FLAGS_LONGLONG)
type = FORMAT_LONGLONG;
else if(flags & FLAGS_LONG)
type = FORMAT_LONG;
else
type = FORMAT_INT;
break;
case 'u':
if(flags & FLAGS_LONGLONG)
type = FORMAT_LONGLONGU;
else if(flags & FLAGS_LONG)
type = FORMAT_LONGU;
else
type = FORMAT_INTU;
flags |= FLAGS_UNSIGNED;
break;
case 'o':
type = FORMAT_INT;
flags |= FLAGS_OCTAL;
break;
case 'x':
type = FORMAT_INTU;
flags |= FLAGS_HEX|FLAGS_UNSIGNED;
break;
case 'X':
type = FORMAT_INTU;
flags |= FLAGS_HEX|FLAGS_UPPER|FLAGS_UNSIGNED;
break;
case 'c':
type = FORMAT_INT;
flags |= FLAGS_CHAR;
break;
case 'f':
type = FORMAT_DOUBLE;
break;
case 'e':
type = FORMAT_DOUBLE;
flags |= FLAGS_FLOATE;
break;
case 'E':
type = FORMAT_DOUBLE;
flags |= FLAGS_FLOATE|FLAGS_UPPER;
break;
case 'g':
type = FORMAT_DOUBLE;
flags |= FLAGS_FLOATG;
break;
case 'G':
type = FORMAT_DOUBLE;
flags |= FLAGS_FLOATG|FLAGS_UPPER;
break;
default:
/* invalid instruction, disregard and continue */
continue;
} /* switch */
if(flags & FLAGS_WIDTHPARAM) {
if(width < 0)
width = param_num++;
else {
/* if this identifies a parameter already used, this
is illegal */
if(usedinput[width/8] & (1 << (width&7)))
return PFMT_WIDTHARG;
}
if(width >= MAX_PARAMETERS)
return PFMT_MANYARGS;
if(width >= max_param)
max_param = width;
in[width].type = FORMAT_WIDTH;
/* mark as used */
usedinput[width/8] |= (unsigned char)(1 << (width&7));
}
if(flags & FLAGS_PRECPARAM) {
if(precision < 0)
precision = param_num++;
else {
/* if this identifies a parameter already used, this
is illegal */
if(usedinput[precision/8] & (1 << (precision&7)))
return PFMT_PRECARG;
}
if(precision >= MAX_PARAMETERS)
return PFMT_MANYARGS;
if(precision >= max_param)
max_param = precision;
in[precision].type = FORMAT_PRECISION;
usedinput[precision/8] |= (unsigned char)(1 << (precision&7));
}
/* Handle the specifier */
if(param < 0)
param = param_num++;
if(param >= MAX_PARAMETERS)
return PFMT_MANYARGS;
if(param >= max_param)
max_param = param;
iptr = &in[param];
iptr->type = type;
/* mark this input as used */
usedinput[param/8] |= (unsigned char)(1 << (param&7));
fmt++;
optr = &out[ocount++];
if(ocount > MAX_SEGMENTS)
return PFMT_MANYSEGS;
optr->input = (unsigned int)param;
optr->flags = flags;
optr->width = width;
optr->precision = precision;
optr->start = start;
optr->outlen = outlen;
start = fmt;
}
else
fmt++;
}
/* is there a trailing piece */
outlen = (size_t)(fmt - start);
if(outlen) {
optr = &out[ocount++];
if(ocount > MAX_SEGMENTS)
return PFMT_MANYSEGS;
optr->input = 0;
optr->flags = FLAGS_SUBSTR;
optr->start = start;
optr->outlen = outlen;
}
/* Read the arg list parameters into our data list */
for(i = 0; i < max_param + 1; i++) {
struct va_input *iptr = &in[i];
if(!(usedinput[i/8] & (1 << (i&7))))
/* bad input */
return PFMT_INPUTGAP;
/* based on the type, read the correct argument */
switch(iptr->type) {
case FORMAT_STRING:
iptr->val.str = va_arg(arglist, char *);
break;
case FORMAT_INTPTR:
case FORMAT_PTR:
iptr->val.ptr = va_arg(arglist, void *);
break;
case FORMAT_LONGLONGU:
iptr->val.numu = (mp_uintmax_t)va_arg(arglist, mp_uintmax_t);
break;
case FORMAT_LONGLONG:
iptr->val.nums = (mp_intmax_t)va_arg(arglist, mp_intmax_t);
break;
case FORMAT_LONGU:
iptr->val.numu = (mp_uintmax_t)va_arg(arglist, unsigned long);
break;
case FORMAT_LONG:
iptr->val.nums = (mp_intmax_t)va_arg(arglist, long);
break;
case FORMAT_INTU:
iptr->val.numu = (mp_uintmax_t)va_arg(arglist, unsigned int);
break;
case FORMAT_INT:
case FORMAT_WIDTH:
case FORMAT_PRECISION:
iptr->val.nums = (mp_intmax_t)va_arg(arglist, int);
break;
case FORMAT_DOUBLE:
iptr->val.dnum = va_arg(arglist, double);
break;
default:
DEBUGASSERT(NULL); /* unexpected */
break;
}
}
*ipieces = max_param + 1;
*opieces = ocount;
return PFMT_OK;
}
/*
* formatf() - the general printf function.
*
* It calls parsefmt() to parse the format string. It populates two arrays;
* one that describes the input arguments and one that describes a number of
* output segments.
*
* On success, the input array describes the type of all arguments and their
* values.
*
* The function then iterates over the output segments and outputs them one
* by one until done. Using the appropriate input arguments (if any).
*
* All output is sent to the 'stream()' callback, one byte at a time.
*/
static int formatf(
void *userp, /* untouched by format(), just sent to the stream() function in
the second argument */
/* function pointer called for each output character */
int (*stream)(unsigned char, void *),
const char *format, /* %-formatted string */
va_list ap_save) /* list of parameters */
{
static const char nilstr[] = "(nil)";
const char *digits = lower_digits; /* Base-36 digits for numbers. */
int done = 0; /* number of characters written */
int i;
int ocount = 0; /* number of output segments */
int icount = 0; /* number of input arguments */
struct outsegment output[MAX_SEGMENTS];
struct va_input input[MAX_PARAMETERS];
char work[BUFFSIZE];
/* '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];
/* Parse the format string */
if(parsefmt(format, output, input, &ocount, &icount, ap_save))
return 0;
for(i = 0; i < ocount; i++) {
struct outsegment *optr = &output[i];
struct va_input *iptr;
bool is_alt; /* Format spec modifiers. */
int width; /* Width of a field. */
int prec; /* Precision of a field. */
bool is_neg; /* Decimal integer is negative. */
unsigned long base; /* Base of a number to be written. */
mp_uintmax_t num; /* Integral values to be written. */
mp_intmax_t signed_num; /* Used to convert negative in positive. */
char *w;
size_t outlen = optr->outlen;
unsigned int flags = optr->flags;
if(outlen) {
char *str = optr->start;
for(; outlen && *str; outlen--)
OUTCHAR(*str++);
if(optr->flags & FLAGS_SUBSTR)
/* this is just a substring */
continue;
}
/* pick up the specified width */
if(flags & FLAGS_WIDTHPARAM) {
width = (int)input[optr->width].val.nums;
if(width < 0) {
/* "A negative field width is taken as a '-' flag followed by a
positive field width." */
if(width == INT_MIN)
width = INT_MAX;
else
width = -width;
flags |= FLAGS_LEFT;
flags &= ~(unsigned int)FLAGS_PAD_NIL;
}
}
else
width = optr->width;
/* pick up the specified precision */
if(flags & FLAGS_PRECPARAM) {
prec = (int)input[optr->precision].val.nums;
if(prec < 0)
/* "A negative precision is taken as if the precision were
omitted." */
prec = -1;
}
else if(flags & FLAGS_PREC)
prec = optr->precision;
else
prec = -1;
is_alt = (flags & FLAGS_ALT) ? 1 : 0;
iptr = &input[optr->input];
switch(iptr->type) {
case FORMAT_INTU:
case FORMAT_LONGU:
case FORMAT_LONGLONGU:
flags |= FLAGS_UNSIGNED;
FALLTHROUGH();
case FORMAT_INT:
case FORMAT_LONG:
case FORMAT_LONGLONG:
num = iptr->val.numu;
if(flags & FLAGS_CHAR) {
/* Character. */
if(!(flags & FLAGS_LEFT))
while(--width > 0)
OUTCHAR(' ');
OUTCHAR((char) num);
if(flags & FLAGS_LEFT)
while(--width > 0)
OUTCHAR(' ');
break;
}
if(flags & FLAGS_OCTAL) {
/* Octal unsigned integer */
base = 8;
is_neg = FALSE;
}
else if(flags & FLAGS_HEX) {
/* Hexadecimal unsigned integer */
digits = (flags & FLAGS_UPPER)? upper_digits : lower_digits;
base = 16;
is_neg = FALSE;
}
else if(flags & FLAGS_UNSIGNED) {
/* Decimal unsigned integer */
base = 10;
is_neg = FALSE;
}
else {
/* Decimal integer. */
base = 10;
is_neg = (iptr->val.nums < (mp_intmax_t)0);
if(is_neg) {
/* signed_num might fail to hold absolute negative minimum by 1 */
signed_num = iptr->val.nums + (mp_intmax_t)1;
signed_num = -signed_num;
num = (mp_uintmax_t)signed_num;
num += (mp_uintmax_t)1;
}
}
number:
/* Supply a default precision if none was given. */
if(prec == -1)
prec = 1;
/* Put the number in WORK. */
w = workend;
switch(base) {
case 10:
while(num > 0) {
*w-- = (char)('0' + (num % 10));
num /= 10;
}
break;
default:
while(num > 0) {
*w-- = digits[num % base];
num /= base;
}
break;
}
width -= (int)(workend - w);
prec -= (int)(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 || (flags & FLAGS_SHOWSIGN) || (flags & FLAGS_SPACE))
--width;
if(!(flags & FLAGS_LEFT) && !(flags & FLAGS_PAD_NIL))
while(width-- > 0)
OUTCHAR(' ');
if(is_neg)
OUTCHAR('-');
else if(flags & FLAGS_SHOWSIGN)
OUTCHAR('+');
else if(flags & FLAGS_SPACE)
OUTCHAR(' ');
if(is_alt && base == 16) {
OUTCHAR('0');
if(flags & FLAGS_UPPER)
OUTCHAR('X');
else
OUTCHAR('x');
}
if(!(flags & FLAGS_LEFT) && (flags & FLAGS_PAD_NIL))
while(width-- > 0)
OUTCHAR('0');
/* Write the number. */
while(++w <= workend) {
OUTCHAR(*w);
}
if(flags & FLAGS_LEFT)
while(width-- > 0)
OUTCHAR(' ');
break;
case FORMAT_STRING: {
const char *str;
size_t len;
str = (char *)iptr->val.str;
if(!str) {
/* Write null string if there's space. */
if(prec == -1 || prec >= (int) sizeof(nilstr) - 1) {
str = nilstr;
len = sizeof(nilstr) - 1;
/* Disable quotes around (nil) */
flags &= ~(unsigned int)FLAGS_ALT;
}
else {
str = "";
len = 0;
}
}
else if(prec != -1)
len = (size_t)prec;
else if(*str == '\0')
len = 0;
else
len = strlen(str);
width -= (len > INT_MAX) ? INT_MAX : (int)len;
if(flags & FLAGS_ALT)
OUTCHAR('"');
if(!(flags & FLAGS_LEFT))
while(width-- > 0)
OUTCHAR(' ');
for(; len && *str; len--)
OUTCHAR(*str++);
if(flags & FLAGS_LEFT)
while(width-- > 0)
OUTCHAR(' ');
if(flags & FLAGS_ALT)
OUTCHAR('"');
break;
}
case FORMAT_PTR:
/* Generic pointer. */
if(iptr->val.ptr) {
/* If the pointer is not NULL, write it as a %#x spec. */
base = 16;
digits = (flags & FLAGS_UPPER)? upper_digits : lower_digits;
is_alt = TRUE;
num = (size_t) iptr->val.ptr;
is_neg = FALSE;
goto number;
}
else {
/* Write "(nil)" for a nil pointer. */
const char *point;
width -= (int)(sizeof(nilstr) - 1);
if(flags & FLAGS_LEFT)
while(width-- > 0)
OUTCHAR(' ');
for(point = nilstr; *point != '\0'; ++point)
OUTCHAR(*point);
if(!(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;
if(flags & FLAGS_WIDTH)
width = optr->width;
if(flags & FLAGS_PREC)
prec = optr->precision;
if(flags & FLAGS_LEFT)
*fptr++ = '-';
if(flags & FLAGS_SHOWSIGN)
*fptr++ = '+';
if(flags & FLAGS_SPACE)
*fptr++ = ' ';
if(flags & FLAGS_ALT)
*fptr++ = '#';
*fptr = 0;
if(width >= 0) {
size_t dlen;
if(width >= (int)sizeof(work))
width = sizeof(work)-1;
/* RECURSIVE USAGE */
dlen = (size_t)curl_msnprintf(fptr, left, "%d", width);
fptr += dlen;
left -= dlen;
}
if(prec >= 0) {
/* for each digit in the integer part, we can have one less
precision */
size_t maxprec = sizeof(work) - 2;
double val = iptr->val.dnum;
if(width > 0 && prec <= width)
maxprec -= (size_t)width;
while(val >= 10.0) {
val /= 10;
maxprec--;
}
if(prec > (int)maxprec)
prec = (int)maxprec-1;
if(prec < 0)
prec = 0;
/* RECURSIVE USAGE */
len = curl_msnprintf(fptr, left, ".%d", prec);
fptr += len;
}
if(flags & FLAGS_LONG)
*fptr++ = 'l';
if(flags & FLAGS_FLOATE)
*fptr++ = (char)((flags & FLAGS_UPPER) ? 'E':'e');
else if(flags & FLAGS_FLOATG)
*fptr++ = (char)((flags & FLAGS_UPPER) ? 'G' : 'g');
else
*fptr++ = 'f';
*fptr = 0; /* and a final null-termination */
#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wformat-nonliteral"
#endif
/* NOTE NOTE NOTE!! Not all sprintf implementations return number of
output characters */
#ifdef HAVE_SNPRINTF
(snprintf)(work, sizeof(work), formatbuf, iptr->val.dnum);
#else
(sprintf)(work, formatbuf, iptr->val.dnum);
#endif
#ifdef __clang__
#pragma clang diagnostic pop
#endif
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(flags & FLAGS_LONGLONG)
*(LONG_LONG_TYPE *) iptr->val.ptr = (LONG_LONG_TYPE)done;
else
#endif
if(flags & FLAGS_LONG)
*(long *) iptr->val.ptr = (long)done;
else if(!(flags & FLAGS_SHORT))
*(int *) iptr->val.ptr = (int)done;
else
*(short *) iptr->val.ptr = (short)done;
break;
default:
break;
}
}
return done;
}
/* fputc() look-alike */
static int addbyter(unsigned char outc, void *f)
{
struct nsprintf *infop = f;
if(infop->length < infop->max) {
/* only do this if we haven't reached max length yet */
*infop->buffer++ = (char)outc; /* store */
infop->length++; /* we are now one byte larger */
return 0; /* 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 = formatf(&info, addbyter, format, ap_save);
if(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;
DEBUGASSERT(retcode);
retcode--; /* don't count the nul byte */
}
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(unsigned char outc, void *f)
{
struct asprintf *infop = f;
CURLcode result = Curl_dyn_addn(infop->b, &outc, 1);
if(result) {
infop->merr = result == CURLE_TOO_LARGE ? MERR_TOO_LARGE : MERR_MEM;
return 1 ; /* fail */
}
return 0;
}
/* appends the formatted string, returns MERR error code */
int Curl_dyn_vprintf(struct dynbuf *dyn, const char *format, va_list ap_save)
{
struct asprintf info;
info.b = dyn;
info.merr = MERR_OK;
(void)formatf(&info, alloc_addbyter, format, ap_save);
if(info.merr) {
Curl_dyn_free(info.b);
return info.merr;
}
return 0;
}
char *curl_mvaprintf(const char *format, va_list ap_save)
{
struct asprintf info;
struct dynbuf dyn;
info.b = &dyn;
Curl_dyn_init(info.b, DYN_APRINTF);
info.merr = MERR_OK;
(void)formatf(&info, alloc_addbyter, format, ap_save);
if(info.merr) {
Curl_dyn_free(info.b);
return NULL;
}
if(Curl_dyn_len(info.b))
return Curl_dyn_ptr(info.b);
return strdup("");
}
char *curl_maprintf(const char *format, ...)
{
va_list ap_save;
char *s;
va_start(ap_save, format);
s = curl_mvaprintf(format, ap_save);
va_end(ap_save);
return s;
}
static int storebuffer(unsigned char outc, void *f)
{
char **buffer = f;
**buffer = (char)outc;
(*buffer)++;
return 0;
}
int curl_msprintf(char *buffer, const char *format, ...)
{
va_list ap_save; /* argument pointer */
int retcode;
va_start(ap_save, format);
retcode = formatf(&buffer, storebuffer, format, ap_save);
va_end(ap_save);
*buffer = 0; /* we terminate this with a zero byte */
return retcode;
}
static int fputc_wrapper(unsigned char outc, void *f)
{
int out = outc;
FILE *s = f;
int rc = fputc(out, s);
return rc == EOF;
}
int curl_mprintf(const char *format, ...)
{
int retcode;
va_list ap_save; /* argument pointer */
va_start(ap_save, format);
retcode = formatf(stdout, fputc_wrapper, 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 = formatf(whereto, fputc_wrapper, format, ap_save);
va_end(ap_save);
return retcode;
}
int curl_mvsprintf(char *buffer, const char *format, va_list ap_save)
{
int retcode = 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 formatf(stdout, fputc_wrapper, format, ap_save);
}
int curl_mvfprintf(FILE *whereto, const char *format, va_list ap_save)
{
return formatf(whereto, fputc_wrapper, format, ap_save);
}
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