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#include "stdio_impl.h"
#include <errno.h>
#include <ctype.h>
#include <limits.h>
#include <string.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdlib.h>
#include <wchar.h>
#include <inttypes.h>
#ifdef __wasilibc_unmodified_upstream // Changes to optimize printf/scanf when long double isn't needed
#else
#include "printscan.h"
#endif
/* Convenient bit representation for modifier flags, which all fall
* within 31 codepoints of the space character. */
#define ALT_FORM (1U<<'#'-' ')
#define ZERO_PAD (1U<<'0'-' ')
#define LEFT_ADJ (1U<<'-'-' ')
#define PAD_POS (1U<<' '-' ')
#define MARK_POS (1U<<'+'-' ')
#define GROUPED (1U<<'\''-' ')
#define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
/* State machine to accept length modifiers + conversion specifiers.
* Result is 0 on failure, or an argument type to pop on success. */
enum {
BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
ZTPRE, JPRE,
STOP,
PTR, INT, UINT, ULLONG,
LONG, ULONG,
SHORT, USHORT, CHAR, UCHAR,
LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR,
DBL, LDBL,
NOARG,
MAXSTATE
};
#define S(x) [(x)-'A']
static const unsigned char states[]['z'-'A'+1] = {
{ /* 0: bare types */
S('d') = INT, S('i') = INT,
S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT,
S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
S('c') = CHAR, S('C') = INT,
S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
S('m') = NOARG,
S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
}, { /* 1: l-prefixed */
S('d') = LONG, S('i') = LONG,
S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG,
S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
S('c') = INT, S('s') = PTR, S('n') = PTR,
S('l') = LLPRE,
}, { /* 2: ll-prefixed */
S('d') = LLONG, S('i') = LLONG,
S('o') = ULLONG, S('u') = ULLONG,
S('x') = ULLONG, S('X') = ULLONG,
S('n') = PTR,
}, { /* 3: h-prefixed */
S('d') = SHORT, S('i') = SHORT,
S('o') = USHORT, S('u') = USHORT,
S('x') = USHORT, S('X') = USHORT,
S('n') = PTR,
S('h') = HHPRE,
}, { /* 4: hh-prefixed */
S('d') = CHAR, S('i') = CHAR,
S('o') = UCHAR, S('u') = UCHAR,
S('x') = UCHAR, S('X') = UCHAR,
S('n') = PTR,
}, { /* 5: L-prefixed */
S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL,
S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL,
S('n') = PTR,
}, { /* 6: z- or t-prefixed (assumed to be same size) */
S('d') = PDIFF, S('i') = PDIFF,
S('o') = SIZET, S('u') = SIZET,
S('x') = SIZET, S('X') = SIZET,
S('n') = PTR,
}, { /* 7: j-prefixed */
S('d') = IMAX, S('i') = IMAX,
S('o') = UMAX, S('u') = UMAX,
S('x') = UMAX, S('X') = UMAX,
S('n') = PTR,
}
};
#define OOB(x) ((unsigned)(x)-'A' > 'z'-'A')
union arg
{
uintmax_t i;
#if !defined(__wasilibc_printscan_no_floating_point)
#if defined(__wasilibc_printscan_no_long_double)
long_double f;
#else
long double f;
#endif
#endif
void *p;
};
static void pop_arg(union arg *arg, int type, va_list *ap)
{
switch (type) {
case PTR: arg->p = va_arg(*ap, void *);
break; case INT: arg->i = va_arg(*ap, int);
break; case UINT: arg->i = va_arg(*ap, unsigned int);
break; case LONG: arg->i = va_arg(*ap, long);
break; case ULONG: arg->i = va_arg(*ap, unsigned long);
break; case ULLONG: arg->i = va_arg(*ap, unsigned long long);
break; case SHORT: arg->i = (short)va_arg(*ap, int);
break; case USHORT: arg->i = (unsigned short)va_arg(*ap, int);
break; case CHAR: arg->i = (signed char)va_arg(*ap, int);
break; case UCHAR: arg->i = (unsigned char)va_arg(*ap, int);
break; case LLONG: arg->i = va_arg(*ap, long long);
break; case SIZET: arg->i = va_arg(*ap, size_t);
break; case IMAX: arg->i = va_arg(*ap, intmax_t);
break; case UMAX: arg->i = va_arg(*ap, uintmax_t);
break; case PDIFF: arg->i = va_arg(*ap, ptrdiff_t);
break; case UIPTR: arg->i = (uintptr_t)va_arg(*ap, void *);
#if defined(__wasilibc_printscan_no_floating_point)
break; case DBL:
break; case LDBL: floating_point_not_supported();
#else
break; case DBL: arg->f = va_arg(*ap, double);
#if defined(__wasilibc_printscan_no_long_double)
break; case LDBL: long_double_not_supported();
#else
break; case LDBL: arg->f = va_arg(*ap, long double);
#endif
#endif
}
}
static void out(FILE *f, const wchar_t *s, size_t l)
{
while (l-- && !(f->flags & F_ERR)) fputwc(*s++, f);
}
static int getint(wchar_t **s) {
int i;
for (i=0; iswdigit(**s); (*s)++) {
if (i > INT_MAX/10U || **s-'0' > INT_MAX-10*i) i = -1;
else i = 10*i + (**s-'0');
}
return i;
}
static const char sizeprefix['y'-'a'] = {
['a'-'a']='L', ['e'-'a']='L', ['f'-'a']='L', ['g'-'a']='L',
['d'-'a']='j', ['i'-'a']='j', ['o'-'a']='j', ['u'-'a']='j', ['x'-'a']='j',
['p'-'a']='j'
};
static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_arg, int *nl_type)
{
wchar_t *a, *z, *s=(wchar_t *)fmt;
unsigned l10n=0, fl;
int w, p, xp;
union arg arg;
int argpos;
unsigned st, ps;
int cnt=0, l=0;
int i;
int t;
char *bs;
char charfmt[16];
wchar_t wc;
for (;;) {
/* This error is only specified for snprintf, but since it's
* unspecified for other forms, do the same. Stop immediately
* on overflow; otherwise %n could produce wrong results. */
if (l > INT_MAX - cnt) goto overflow;
/* Update output count, end loop when fmt is exhausted */
cnt += l;
if (!*s) break;
/* Handle literal text and %% format specifiers */
for (a=s; *s && *s!='%'; s++);
for (z=s; s[0]=='%' && s[1]=='%'; z++, s+=2);
if (z-a > INT_MAX-cnt) goto overflow;
l = z-a;
if (f) out(f, a, l);
if (l) continue;
if (iswdigit(s[1]) && s[2]=='$') {
l10n=1;
argpos = s[1]-'0';
s+=3;
} else {
argpos = -1;
s++;
}
/* Read modifier flags */
for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++)
fl |= 1U<<*s-' ';
/* Read field width */
if (*s=='*') {
if (iswdigit(s[1]) && s[2]=='$') {
l10n=1;
nl_type[s[1]-'0'] = INT;
w = nl_arg[s[1]-'0'].i;
s+=3;
} else if (!l10n) {
w = f ? va_arg(*ap, int) : 0;
s++;
} else goto inval;
if (w<0) fl|=LEFT_ADJ, w=-w;
} else if ((w=getint(&s))<0) goto overflow;
/* Read precision */
if (*s=='.' && s[1]=='*') {
if (isdigit(s[2]) && s[3]=='$') {
nl_type[s[2]-'0'] = INT;
p = nl_arg[s[2]-'0'].i;
s+=4;
} else if (!l10n) {
p = f ? va_arg(*ap, int) : 0;
s+=2;
} else goto inval;
xp = (p>=0);
} else if (*s=='.') {
s++;
p = getint(&s);
xp = 1;
} else {
p = -1;
xp = 0;
}
/* Format specifier state machine */
st=0;
do {
if (OOB(*s)) goto inval;
ps=st;
st=states[st]S(*s++);
} while (st-1<STOP);
if (!st) goto inval;
/* Check validity of argument type (nl/normal) */
if (st==NOARG) {
if (argpos>=0) goto inval;
} else {
if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos];
else if (f) pop_arg(&arg, st, ap);
else return 0;
}
if (!f) continue;
t = s[-1];
if (ps && (t&15)==3) t&=~32;
switch (t) {
case 'n':
switch(ps) {
case BARE: *(int *)arg.p = cnt; break;
case LPRE: *(long *)arg.p = cnt; break;
case LLPRE: *(long long *)arg.p = cnt; break;
case HPRE: *(unsigned short *)arg.p = cnt; break;
case HHPRE: *(unsigned char *)arg.p = cnt; break;
case ZTPRE: *(size_t *)arg.p = cnt; break;
case JPRE: *(uintmax_t *)arg.p = cnt; break;
}
continue;
case 'c':
if (w<1) w=1;
if (w>1 && !(fl&LEFT_ADJ)) fprintf(f, "%*s", w-1, "");
fputwc(btowc(arg.i), f);
if (w>1 && (fl&LEFT_ADJ)) fprintf(f, "%*s", w-1, "");
l = w;
continue;
case 'C':
fputwc(arg.i, f);
l = 1;
continue;
case 'S':
a = arg.p;
z = a + wcsnlen(a, p<0 ? INT_MAX : p);
if (p<0 && *z) goto overflow;
p = z-a;
if (w<p) w=p;
if (!(fl&LEFT_ADJ)) fprintf(f, "%*s", w-p, "");
out(f, a, p);
if ((fl&LEFT_ADJ)) fprintf(f, "%*s", w-p, "");
l=w;
continue;
case 'm':
arg.p = strerror(errno);
case 's':
if (!arg.p) arg.p = "(null)";
bs = arg.p;
for (i=l=0; l<(p<0?INT_MAX:p) && (i=mbtowc(&wc, bs, MB_LEN_MAX))>0; bs+=i, l++);
if (i<0) return -1;
if (p<0 && *bs) goto overflow;
p=l;
if (w<p) w=p;
if (!(fl&LEFT_ADJ)) fprintf(f, "%*s", w-p, "");
bs = arg.p;
while (l--) {
i=mbtowc(&wc, bs, MB_LEN_MAX);
bs+=i;
fputwc(wc, f);
}
if ((fl&LEFT_ADJ)) fprintf(f, "%*s", w-p, "");
l=w;
continue;
}
if (xp && p<0) goto overflow;
#if defined(__wasilibc_printscan_no_long_double)
// Omit the 'L' modifier for floating-point cases.
switch (t|32) {
case 'a': case 'e': case 'f': case 'g':
snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c",
"#"+!(fl & ALT_FORM),
"+"+!(fl & MARK_POS),
"-"+!(fl & LEFT_ADJ),
" "+!(fl & PAD_POS),
"0"+!(fl & ZERO_PAD),
t);
l = fprintf(f, charfmt, w, p, arg.f);
break;
case 'd': case 'i': case 'o': case 'u': case 'x': case 'p':
snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c%c",
"#"+!(fl & ALT_FORM),
"+"+!(fl & MARK_POS),
"-"+!(fl & LEFT_ADJ),
" "+!(fl & PAD_POS),
"0"+!(fl & ZERO_PAD),
sizeprefix[(t|32)-'a'], t);
l = fprintf(f, charfmt, w, p, arg.i);
break;
}
#else
snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c%c",
"#"+!(fl & ALT_FORM),
"+"+!(fl & MARK_POS),
"-"+!(fl & LEFT_ADJ),
" "+!(fl & PAD_POS),
"0"+!(fl & ZERO_PAD),
sizeprefix[(t|32)-'a'], t);
switch (t|32) {
#if !defined(__wasilibc_printscan_no_floating_point)
case 'a': case 'e': case 'f': case 'g':
l = fprintf(f, charfmt, w, p, arg.f);
break;
#endif
case 'd': case 'i': case 'o': case 'u': case 'x': case 'p':
l = fprintf(f, charfmt, w, p, arg.i);
break;
}
#endif
}
if (f) return cnt;
if (!l10n) return 0;
for (i=1; i<=NL_ARGMAX && nl_type[i]; i++)
pop_arg(nl_arg+i, nl_type[i], ap);
for (; i<=NL_ARGMAX && !nl_type[i]; i++);
if (i<=NL_ARGMAX) return -1;
return 1;
inval:
errno = EINVAL;
return -1;
overflow:
errno = EOVERFLOW;
return -1;
}
int vfwprintf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
{
va_list ap2;
int nl_type[NL_ARGMAX] = {0};
union arg nl_arg[NL_ARGMAX];
int olderr;
int ret;
/* the copy allows passing va_list* even if va_list is an array */
va_copy(ap2, ap);
if (wprintf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) {
va_end(ap2);
return -1;
}
FLOCK(f);
fwide(f, 1);
olderr = f->flags & F_ERR;
f->flags &= ~F_ERR;
ret = wprintf_core(f, fmt, &ap2, nl_arg, nl_type);
if (f->flags & F_ERR) ret = -1;
f->flags |= olderr;
FUNLOCK(f);
va_end(ap2);
return ret;
}
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