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rockbox/firmware/common/vuprintf.c
William Wilgus de6618a271 Fix vuprintf fix possible %s buffer over-read 
when precision is not specified memchr recieved -1 for count
count is unsigned so it looks in a potentially very large area
for a terminator and returns this whole area if \0 is not found

Instead we should use memchr when precision is specified
and if precision is not specified use strlen

Fixes 60+Mb Config.cfg files

Change-Id: Ic4d1439334588f999c9071235430c42df2af5cc4
2018-11-10 02:47:19 +01:00

980 lines
32 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Gary Czvitkovicz
* Copyright (C) 2017 by Michael A. Sevakis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <sys/types.h>
#include <limits.h>
#include <string.h>
#include <stddef.h>
#include "system.h"
#include "vuprintf.h"
#ifndef BOOTLOADER
/* turn everything on */
#define FMT_LENMOD (0xffffffff)
#define FMT_RADIX (0xffffffff)
#endif
/* these are the defaults if no other preference is given */
#ifndef FMT_LENMOD
#define FMT_LENMOD (FMT_LENMOD_l | \
FMT_LENMOD_z)
#endif /* FMT_LENMOD */
#ifndef FMT_RADIX
#define FMT_RADIX (FMT_RADIX_c | \
FMT_RADIX_d | \
FMT_RADIX_p | \
FMT_RADIX_s | \
FMT_RADIX_u | \
FMT_RADIX_x)
#endif /* FMT_RADIX */
/** Length modifier and radix flags **/
/* compulsory length modifiers: NONE
* however a compatible 'l' or 'll' must be defined if another requires it */
#define FMT_LENMOD_h 0x001 /* signed/unsigned short (%h<radix>) */
#define FMT_LENMOD_hh 0x002 /* signed/unsigned char (%hh<radix>) */
#define FMT_LENMOD_j 0x004 /* intmax_t/uintmax_t (%j<radix>) */
#define FMT_LENMOD_l 0x008 /* signed/unsigned long (%l<radix>) */
#define FMT_LENMOD_ll 0x010 /* signed/unsigned long long (%ll<radix>) */
#define FMT_LENMOD_t 0x020 /* signed/unsigned ptrdiff_t (%t<radix>) */
#define FMT_LENMOD_z 0x040 /* size_t/ssize_t (%z<radix>) */
#define FMT_LENMOD_L 0x080 /* long double (instead of double) */
/* compulsory radixes: c, d, i, u, s */
#define FMT_RADIX_c 0x001 /* single character (%c) */
#define FMT_RADIX_d 0x002 /* signed integer type, decimal (%d %i) */
#define FMT_RADIX_n 0x004 /* bytes output so far (%n) */
#define FMT_RADIX_o 0x008 /* unsigned integer type, octal (%o) */
#define FMT_RADIX_p 0x010 /* pointer (%p %P) */
#define FMT_RADIX_s 0x020 /* string (%s) */
#define FMT_RADIX_u 0x040 /* unsigned integer type, decimal (%u) */
#define FMT_RADIX_x 0x080 /* unsigned integer type, hex (%x %X) */
#define FMT_RADIX_a 0x100 /* hex floating point "[-]0xh.hhhhp<68>d" */
#define FMT_RADIX_e 0x200 /* floating point with exponent "[-]d.ddde<64>dd" */
#define FMT_RADIX_f 0x400 /* floating point "[-]ddd.ddd" */
#define FMT_RADIX_g 0x800 /* floating point exponent or decimal depending
upon value and precision */
/* avoid defining redundant functions if two or more types can use the same
* something not getting a macro means it gets assigned its own value and
* formatter */
/* l */
#if LONG_MIN == INT_MIN && LONG_MAX == INT_MAX
#define val_ld val_d
#define format_ld format_d
#define branch_fmt_ld branch_fmt_d
#elif !(FMT_LENMOD & FMT_LENMOD_l) /* unique */
#define val_ld
#endif /* LONG_ */
#if ULONG_MAX == UINT_MAX
#define val_lu val_u
#define format_lu format_u
#define branch_fmt_lu branch_fmt_u
#elif !(FMT_LENMOD & FMT_LENMOD_l) /* unique */
#define val_lu
#endif /* ULONG_ */
/* ll */
#if LLONG_MIN == INT_MIN && LLONG_MAX == INT_MAX
#define val_lld val_d
#define format_lld format_d
#define branch_fmt_lld branch_fmt_d
#elif LLONG_MIN == LONG_MIN && LLONG_MAX == LONG_MAX
#define val_lld val_ld
#define format_lld format_ld
#define branch_fmt_lld branch_fmt_ld
#elif !(FMT_LENMOD & FMT_LENMOD_ll) /* unique */
#define val_lld
#endif /* LLONG_ */
#if ULLONG_MAX == UINT_MAX
#define val_llu val_u
#define format_llu format_u
#define branch_fmt_llu branch_fmt_u
#elif ULLONG_MAX == ULONG_MAX
#define val_llu val_lu
#define format_llu format_lu
#define branch_fmt_llu branch_fmt_lu
#elif !(FMT_LENMOD & FMT_LENMOD_ll) /* unique */
#define val_llu
#endif /* ULLONG_ */
/* char/short parameter type promotions */
#define SCHAR_INT_ARG int
#define UCHAR_INT_ARG int
#define SSHRT_INT_ARG int
#if USHRT_MAX == UINT_MAX
#define USHRT_INT_ARG unsigned int
#else
#define USHRT_INT_ARG int
#endif
/* some macros to have conditional work inside macros */
#if (FMT_LENMOD & FMT_LENMOD_l)
#define IF_FMT_LENMOD_l(...) __VA_ARGS__
#else
#define IF_FMT_LENMOD_l(...)
#endif
#if (FMT_LENMOD & FMT_LENMOD_ll)
#define IF_FMT_LENMOD_ll(...) __VA_ARGS__
#else
#define IF_FMT_LENMOD_ll(...)
#endif
#if (FMT_RADIX & FMT_RADIX_o)
#define IF_FMT_RADIX_o(...) __VA_ARGS__
#else
#define IF_FMT_RADIX_o(...)
#endif
#if (FMT_RADIX & FMT_RADIX_x)
#define IF_FMT_RADIX_x(...) __VA_ARGS__
#else
#define IF_FMT_RADIX_x(...)
#endif
/* synthesize multicharacter constant */
#define LENMOD2(cv, ch) \
(((cv) << CHAR_BIT) | (ch))
#define LENMOD_NONE 0
#if (FMT_LENMOD & FMT_LENMOD_h)
#define LENMOD_h 'h'
#endif
#if (FMT_LENMOD & FMT_LENMOD_hh)
#define LENMOD_hh LENMOD2('h', 'h') /* 'hh' */
#endif
#if (FMT_LENMOD & FMT_LENMOD_j)
#define LENMOD_j 'j'
#endif
#if (FMT_LENMOD & FMT_LENMOD_l)
#define LENMOD_l 'l'
#endif
#if (FMT_LENMOD & FMT_LENMOD_ll)
#undef FMT_MAX_L
#define LENMOD_ll LENMOD2('l', 'l') /* 'll' */
#endif
#if (FMT_LENMOD & FMT_LENMOD_t)
#define LENMOD_t 't'
#endif
#if (FMT_LENMOD & FMT_LENMOD_z)
#define LENMOD_z 'z'
#endif
/* select type-compatible length modifier
* (a bit hacky; it should be range-based) */
#define LENMOD_INTCOMPAT_SEL(type, signd) \
({ int __lenmod; \
size_t __size = sizeof (type); \
if (__size == ((signd) ? sizeof (int) : \
sizeof (unsigned int))) { \
__lenmod = LENMOD_NONE; \
} \
else if (__size == ((signd) ? sizeof (long) : \
sizeof (unsigned long))) { \
IF_FMT_LENMOD_l(__lenmod = LENMOD_l;) \
} \
else if (__size == ((signd) ? sizeof (long long) : \
sizeof (unsigned long long))) { \
IF_FMT_LENMOD_ll(__lenmod = LENMOD_ll;) \
} \
__lenmod; })
/* call formatting function for the compatible integer type */
#define LENMOD_INTCOMPAT_CALL(inteqv, val, fmt_buf, x, signd) \
({ const char *__buf; \
switch (inteqv) { \
case LENMOD_NONE: \
__buf = (signd) ? \
format_d((val), (fmt_buf), (x)) : \
format_u((val), (fmt_buf), (x)); \
break; \
IF_FMT_LENMOD_l( \
case LENMOD_l: \
__buf = (signd) ? \
format_ld((val), (fmt_buf), (x)) : \
format_lu((val), (fmt_buf), (x)); \
break; \
) \
IF_FMT_LENMOD_ll( \
case LENMOD_ll: \
__buf = (signd) ? \
format_lld((val), (fmt_buf), (x)) : \
format_llu((val), (fmt_buf), (x)); \
break; \
) \
} \
__buf; \
})
/* execute formatting branch for the compatible integer type */
#define LENMOD_INTCOMPAT_BRANCH(inteqv, val, signd) \
({ switch (inteqv) { \
case LENMOD_NONE: \
if (signd) { \
val_d = (val); \
goto branch_fmt_d; \
} \
else { \
val_u = (val); \
goto branch_fmt_u; \
} \
IF_FMT_LENMOD_l( \
case LENMOD_l: \
if (signd) { \
val_ld = (val); \
goto branch_fmt_ld; \
} \
else { \
val_lu = (val); \
goto branch_fmt_lu; \
} \
) \
IF_FMT_LENMOD_ll( \
case LENMOD_ll: \
if (signd) { \
val_lld = (val); \
goto branch_fmt_lld; \
} \
else { \
val_llu = (val); \
goto branch_fmt_llu; \
} \
) \
} \
})
#define CONVERT_RADIX_10_SIGN(val, fmt_buf, p, signchar, type) \
do { \
if (val) { \
unsigned type v; \
\
if (val < 0) { \
v = (typeof (v))-(val + 1) + 1; \
signchar = '-'; \
} \
else { \
v = val; \
} \
\
do { \
*--p = (v % 10) + '0'; \
v /= 10; \
} while (v); \
} \
\
if (signchar) { \
p[-1] = signchar; \
fmt_buf->length = 1; \
break; \
} \
\
fmt_buf->length = 0; \
} while (0)
#define CONVERT_RADIX_8(val, fmt_buf, p) \
do { \
if (val) { \
typeof (val) v = val; \
\
do { \
*--p = (v % 010) + '0'; \
v /= 010; \
} while (v); \
} \
\
if (fmt_buf->length) { \
*--p = '0'; \
fmt_buf->length = 0; \
} \
} while (0)
#define CONVERT_RADIX_10(val, fmt_buf, p) \
do { \
if (val) { \
typeof (val) v = val; \
\
do { \
*--p = (v % 10) + '0'; \
v /= 10; \
} while (v); \
} \
\
fmt_buf->length = 0; \
} while (0)
#define CONVERT_RADIX_16(val, fmt_buf, p, x) \
do { \
if (val) { \
const int h = x - 'X' - 0xA \
+ 'A' - '0'; \
typeof (val) v = val; \
\
do { \
unsigned int d = v % 0x10; \
if (d >= 0xA) { \
d += h; \
} \
*--p = d + '0'; \
v /= 0x10; \
} while (v); \
\
if (fmt_buf->length) { \
p[-1] = x; \
p[-2] = '0'; \
fmt_buf->length = 2; \
break; \
} \
} \
\
fmt_buf->length = 0; \
} while (0)
#define CONVERT_RADIX_NOSIGN(val, fmt_buf, p, x) \
switch (x) \
{ \
IF_FMT_RADIX_o( case 'o': \
CONVERT_RADIX_8(val, fmt_buf, p); \
break; ) \
case 'u': \
CONVERT_RADIX_10(val, fmt_buf, p); \
break; \
IF_FMT_RADIX_x( default: \
CONVERT_RADIX_16(val, fmt_buf, p, x); \
break; ) \
}
struct fmt_buf {
const char *fmt_start; /* second character of formatter after '%' */
size_t length; /* length of formatted text (non-numeric)
or prefix (numeric) */
char buf[24]; /* work buffer */
char bufend[1]; /* buffer end marker and guard '0' */
};
/* %d %i */
static inline const char * format_d(int val,
struct fmt_buf *fmt_buf,
int signchar)
{
char *p = fmt_buf->bufend;
CONVERT_RADIX_10_SIGN(val, fmt_buf, p, signchar, int);
return p;
}
/* %o %u %x %X */
static inline const char * format_u(unsigned int val,
struct fmt_buf *fmt_buf,
int radixchar)
{
char *p = fmt_buf->bufend;
CONVERT_RADIX_NOSIGN(val, fmt_buf, p, radixchar);
return p;
}
#if (FMT_LENMOD & FMT_LENMOD_l)
#ifndef format_ld
/* %ld %li */
static inline const char * format_ld(long val,
struct fmt_buf *fmt_buf,
int signchar)
{
char *p = fmt_buf->bufend;
CONVERT_RADIX_10_SIGN(val, fmt_buf, p, signchar, long);
return p;
}
#endif /* format_ld */
#ifndef format_lu
/* %lo %lu %lx %lX */
static inline const char * format_lu(unsigned long val,
struct fmt_buf *fmt_buf,
int radixchar)
{
char *p = fmt_buf->bufend;
CONVERT_RADIX_NOSIGN(val, fmt_buf, p, radixchar);
return p;
}
#endif /* format_lu */
#endif /* FMT_LENMOD_l */
#if (FMT_LENMOD & FMT_LENMOD_ll)
#ifndef format_lld
/* %lld %lli */
static inline const char * format_lld(long long val,
struct fmt_buf *fmt_buf,
int signchar)
{
char *p = fmt_buf->bufend;
CONVERT_RADIX_10_SIGN(val, fmt_buf, p, signchar, long long);
return p;
}
#endif /* format_lld */
#ifndef format_llu
/* %llo %llu %llx %llX */
static inline const char * format_llu(unsigned long long val,
struct fmt_buf *fmt_buf,
int radixchar)
{
char *p = fmt_buf->bufend;
CONVERT_RADIX_NOSIGN(val, fmt_buf, p, radixchar);
return p;
}
#endif /* format_llu */
#endif /* FMT_LENMOD_ll */
/* %c */
static inline const char * format_c(int c,
struct fmt_buf *fmt_buf,
int lenmod)
{
if (lenmod != LENMOD_NONE) {
return NULL; /* wchar_t support for now */
}
char *p = fmt_buf->bufend;
fmt_buf->length = 1;
*--p = (unsigned char)c;
return p;
}
/* %s */
static inline const char * format_s(const void *str,
struct fmt_buf *fmt_buf,
int precision,
int lenmod)
{
if (lenmod != LENMOD_NONE) {
return NULL; /* wchar_t support for now */
}
const char *s = str;
size_t len;
/* string length may be specified by precision instead of \0-
terminated; however, don't go past a \0 if one is there */
if (precision >= 0) {
const char *nil = memchr(s, '\0', (size_t) precision);
if (nil != NULL && (nil - s) < precision)
len = nil - s;
else
len = precision;
}
else
len = strlen(s);
fmt_buf->length = len;
return s;
}
#if (FMT_RADIX & FMT_RADIX_n)
/* %n */
static inline bool format_n(void *np,
int count,
int lenmod)
{
if (lenmod != LENMOD_NONE) {
return false; /* int only for now */
}
*(int *)np = count;
return true;
}
#endif /* FMT_RADIX_n */
#if (FMT_RADIX & FMT_RADIX_p)
/* %p %P */
static inline const char * format_p(const void *p,
struct fmt_buf *fmt_buf,
int radixchar,
bool *numericp)
{
if (p) {
/* format as %#x or %#X */
*numericp = true;
radixchar -= 'P' - 'X';
fmt_buf->length = 2;
return LENMOD_INTCOMPAT_CALL(LENMOD_INTCOMPAT_SEL(uintptr_t, false),
(uintptr_t)p, fmt_buf, radixchar, false);
}
else {
/* format as %s */
fmt_buf->length = 5;
return "(nil)";
}
}
#endif /* FMT_RADIX_p */
/* parse fixed width or precision field */
static const char * parse_number_spec(const char *fmt,
int ch,
int *out)
{
int i = ch - '0';
while (1) {
ch = *fmt - '0';
if (ch < 0 || ch > 9 || i > INT_MAX / 10 ||
(i == INT_MAX / 10 && ch > INT_MAX % 10)) {
break;
}
i = i * 10 + ch;
fmt++;
}
*out = i;
return fmt;
}
int vuprintf(vuprintf_push_cb push, /* call 'push()' for each output letter */
void *userp,
const char *fmt,
va_list ap)
{
#define PUSHCHAR(ch) \
do { \
int __ch = (ch); \
int __rc = push(userp, __ch); \
count += __rc >= 0; \
if (__rc <= 0) { \
goto done; \
} \
} while (0)
int count = 0;
int ch;
/* macrofied identifiers share a variable with another */
unsigned int val_d;
unsigned int val_u;
#ifndef val_ld
unsigned long val_ld;
#endif
#ifndef val_lu
unsigned long val_lu;
#endif
#ifndef val_lld
unsigned long long val_lld;
#endif
#ifndef val_llu
unsigned long long val_llu;
#endif
struct fmt_buf fmt_buf;
fmt_buf.bufend[0] = '0';
while (1) {
while (1) {
if ((ch = *fmt++) == '\0') {
goto done;
}
if (ch == '%' && (ch = *fmt++) != '%') {
break;
}
PUSHCHAR(ch);
}
/* set to defaults */
fmt_buf.fmt_start = fmt;
int signchar = 0;
unsigned int width = 0;
int lenmod = LENMOD_NONE;
size_t length = 0;
size_t pfxlen = 0;
bool numeric = false;
int alignchar = '0' + 1;
int precision = -1;
const char *buf = NULL;
/*** flags ***/
while (1) {
switch (ch)
{
case ' ': /* <space> before non-negative value (signed conversion) */
case '+': /* '+' before non-negative value (signed conversion) */
/* '+' overrides ' ' */
if (ch > signchar) {
signchar = ch;
}
break;
case '-': /* left-justify in field */
case '0': /* zero-pad to fill field */
/* '-' overrides '0' */
if (ch < alignchar) {
alignchar = ch;
}
break;
case '#': /* number prefix (nonzero %o:'0' %x/%X:'0x') */
/* indicate; formatter updates with actual length */
pfxlen = 1;
break;
#if 0
case '\'': /* digit grouping (non-monetary) */
break;
#endif
default:
goto flags_done;
}
ch = *fmt++;
}
flags_done:
/*** width ***/
if (ch == '*') {
/* variable width */
int w = va_arg(ap, int);
if (w < 0) {
/* negative width is width with implied '-' */
width = (unsigned int)-(w + 1) + 1;
alignchar = '-';
}
else {
width = w;
}
ch = *fmt++;
}
else if (ch >= '1' && ch <= '9') {
/* fixed width */
fmt = parse_number_spec(fmt, ch, &width);
ch = *fmt++;
}
/*** precision ***/
if (ch == '.') {
ch = *fmt++;
if (ch == '*') {
/* variable precision; negative precision is ignored */
precision = va_arg (ap, int);
ch = *fmt++;
}
else if (ch >= '0' && ch <= '9') {
/* fixed precision */
fmt = parse_number_spec(fmt, ch, &precision);
ch = *fmt++;
}
}
/*** length modifier ***/
#if FMT_LENMOD
switch (ch)
{
#if (FMT_LENMOD & (FMT_LENMOD_h | FMT_LENMOD_hh))
case 'h':
#endif
#if (FMT_LENMOD & FMT_LENMOD_j)
case 'j':
#endif
#if (FMT_LENMOD & (FMT_LENMOD_l | FMT_LENMOD_ll))
case 'l':
#endif
#if (FMT_LENMOD & FMT_LENMOD_t)
case 't':
#endif
#if (FMT_LENMOD & FMT_LENMOD_z)
case 'z':
#endif
lenmod = ch;
ch = *fmt++;
#if (FMT_LENMOD & (FMT_LENMOD_hh | FMT_LENMOD_ll))
/* doesn't matter if jj, tt or zz happen; they will be rejected
by the radix handler */
if (ch == lenmod) {
lenmod = LENMOD2(lenmod, ch);
ch = *fmt++;
}
#endif
}
#endif /* FMT_LENMOD */
/*** radix ***/
switch (ch)
{
/** non-numeric **/
case 'c':
buf = format_c(va_arg(ap, int), &fmt_buf, lenmod);
break;
#if (FMT_RADIX & FMT_RADIX_n)
case 'n':
if (format_n(va_arg(ap, void *), count, lenmod)) {
continue; /* no output */
}
break;
#endif
case 's':
buf = format_s(va_arg(ap, const void *), &fmt_buf,
precision, lenmod);
break;
/** non-integer **/
#if (FMT_RADIX & FMT_RADIX_p)
case 'p':
case 'P':
buf = format_p(va_arg(ap, void *), &fmt_buf, ch,
&numeric);
break;
#endif
/** signed integer **/
case 'd':
case 'i':
fmt_buf.length = pfxlen;
switch (lenmod)
{
case LENMOD_NONE:
val_d = va_arg(ap, signed int);
goto branch_fmt_d;
#if (FMT_LENMOD & FMT_LENMOD_h)
case LENMOD_h:
val_d = (signed short)va_arg(ap, SSHRT_INT_ARG);
goto branch_fmt_d;
#endif
#if (FMT_LENMOD & FMT_LENMOD_hh)
case LENMOD_hh:
val_d = (signed char)va_arg(ap, SCHAR_INT_ARG);
goto branch_fmt_d;
#endif
#if (FMT_LENMOD & FMT_LENMOD_j)
case LENMOD_j:
LENMOD_INTCOMPAT_BRANCH(LENMOD_INTCOMPAT_SEL(intmax_t, true),
va_arg(ap, intmax_t), true);
#endif
#if (FMT_LENMOD & FMT_LENMOD_l)
case LENMOD_l:
val_ld = va_arg(ap, signed long);
goto branch_fmt_ld;
#endif
#if (FMT_LENMOD & FMT_LENMOD_ll)
case LENMOD_ll:
val_lld = va_arg(ap, signed long long);
goto branch_fmt_lld;
#endif
#if (FMT_LENMOD & FMT_LENMOD_t)
case LENMOD_t:
LENMOD_INTCOMPAT_BRANCH(LENMOD_INTCOMPAT_SEL(ptrdiff_t, true),
va_arg(ap, ptrdiff_t), true);
#endif
#if (FMT_LENMOD & FMT_LENMOD_z)
case LENMOD_z:
LENMOD_INTCOMPAT_BRANCH(LENMOD_INTCOMPAT_SEL(ssize_t, true),
va_arg(ap, ssize_t), true);
#endif
}
/* macrofied labels share a formatter with another */
if (0) {
branch_fmt_d:
buf = format_d(val_d, &fmt_buf, signchar);
} else if (0) {
#ifndef val_ld
branch_fmt_ld:
buf = format_ld(val_ld, &fmt_buf, signchar);
#endif
} else if (0) {
#ifndef val_lld
branch_fmt_lld:
buf = format_lld(val_lld, &fmt_buf, signchar);
#endif
}
numeric = true;
break;
/** unsigned integer **/
#if (FMT_RADIX & FMT_RADIX_o)
case 'o':
#endif
case 'u':
#if (FMT_RADIX & FMT_RADIX_x)
case 'x':
case 'X':
#endif
fmt_buf.length = pfxlen;
switch (lenmod)
{
case LENMOD_NONE:
val_u = va_arg(ap, unsigned int);
goto branch_fmt_u;
#if (FMT_LENMOD & FMT_LENMOD_h)
case LENMOD_h:
val_u = (unsigned short)va_arg(ap, USHRT_INT_ARG);
goto branch_fmt_u;
#endif
#if (FMT_LENMOD & FMT_LENMOD_hh)
case LENMOD_hh:
val_u = (unsigned char)va_arg(ap, UCHAR_INT_ARG);
goto branch_fmt_u;
#endif
#if (FMT_LENMOD & FMT_LENMOD_j)
case LENMOD_j:
LENMOD_INTCOMPAT_BRANCH(LENMOD_INTCOMPAT_SEL(uintmax_t, false),
va_arg(ap, uintmax_t), false);
#endif
#if (FMT_LENMOD & FMT_LENMOD_l)
case LENMOD_l:
val_lu = va_arg(ap, unsigned long);
goto branch_fmt_lu;
#endif
#if (FMT_LENMOD & FMT_LENMOD_ll)
case LENMOD_ll:
val_llu = va_arg(ap, unsigned long long);
goto branch_fmt_llu;
#endif
#if (FMT_LENMOD & (FMT_LENMOD_t | FMT_LENMOD_z))
/* format "uptrdiff_t" as size_t (unless it becomes standard) */
#if (FMT_LENMOD & FMT_LENMOD_t)
case LENMOD_t:
#endif
#if (FMT_LENMOD & FMT_LENMOD_z)
case LENMOD_z:
#endif
LENMOD_INTCOMPAT_BRANCH(LENMOD_INTCOMPAT_SEL(size_t, false),
va_arg(ap, size_t), false);
#endif
}
/* macrofied labels share a formatter with another */
if (0) {
branch_fmt_u:
buf = format_u(val_u, &fmt_buf, ch);
} else if (0) {
#ifndef val_lu
branch_fmt_lu:
buf = format_lu(val_lu, &fmt_buf, ch);
#endif
} else if (0) {
#ifndef val_llu
branch_fmt_llu:
buf = format_llu(val_llu, &fmt_buf, ch);
#endif
}
numeric = true;
break;
}
if (buf) {
/** padding **/
if (numeric) {
/* numeric formats into fmt_buf.buf */
pfxlen = fmt_buf.length;
length = fmt_buf.bufend - buf;
size_t size = pfxlen + length;
if (precision >= 0) {
/* explicit precision */
precision -= (int)length;
if (precision > 0) {
size += precision;
}
width -= MIN(width, size);
}
else {
/* default precision */
if (!length) {
length = 1;
size++;
}
width -= MIN(width, size);
if (alignchar == '0') {
/* width zero-fill */
precision = width;
width = 0;
}
}
}
else {
/* non-numeric: supress prefix and precision; keep length and
width */
pfxlen = 0;
precision = 0;
length = fmt_buf.length;
width -= MIN(width, length);
}
}
else {
/* format not accepted; print it literally */
buf = fmt_buf.fmt_start - 2;
length = fmt - buf;
width = 0;
pfxlen = 0;
precision = 0;
}
/** push all the stuff **/
if (alignchar != '-') {
/* left padding */
while (width > 0) {
PUSHCHAR(' ');
width--;
}
}
/* prefix */
while (pfxlen > 0) {
PUSHCHAR(buf[-pfxlen]);
pfxlen--;
}
/* 0-padding */
while (precision > 0) {
PUSHCHAR('0');
precision--;
}
/* field */
while (length > 0) {
PUSHCHAR(*buf++);
length--;
}
/* right padding */
while (width > 0) {
PUSHCHAR(' ');
width--;
}
}
done:
return count;
}
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