libc-top-half/musl/src/stdio/vfprintf.c

   1 #include "stdio_impl.h"
   2 #include <errno.h>
   3 #include <ctype.h>
   4 #include <limits.h>
   5 #include <string.h>
   6 #include <stdarg.h>
   7 #include <stddef.h>
   8 #include <stdlib.h>
   9 #include <wchar.h>
  10 #include <inttypes.h>
  11 #include <math.h>
  12 #include <float.h>
  13 #ifdef __wasilibc_unmodified_upstream // Changes to optimize printf/scanf when long double isn't needed
  14 #else
  15 #include "printscan.h"
  16 #endif
  17
  18 /* Some useful macros */
  19
  20 #define MAX(a,b) ((a)>(b) ? (a) : (b))
  21 #define MIN(a,b) ((a)<(b) ? (a) : (b))
  22
  23 /* Convenient bit representation for modifier flags, which all fall
  24  * within 31 codepoints of the space character. */
  25
  26 #define ALT_FORM   (1U<<'#'-' ')
  27 #define ZERO_PAD   (1U<<'0'-' ')
  28 #define LEFT_ADJ   (1U<<'-'-' ')
  29 #define PAD_POS    (1U<<' '-' ')
  30 #define MARK_POS   (1U<<'+'-' ')
  31 #define GROUPED    (1U<<'\''-' ')
  32
  33 #define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
  34
  35 /* State machine to accept length modifiers + conversion specifiers.
  36  * Result is 0 on failure, or an argument type to pop on success. */
  37
  38 enum {
  39         BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
  40         ZTPRE, JPRE,
  41         STOP,
  42         PTR, INT, UINT, ULLONG,
  43         LONG, ULONG,
  44         SHORT, USHORT, CHAR, UCHAR,
  45         LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR,
  46         DBL, LDBL,
  47         NOARG,
  48         MAXSTATE
  49 };
  50
  51 #define S(x) [(x)-'A']
  52
  53 static const unsigned char states[]['z'-'A'+1] = {
  54         { /* 0: bare types */
  55                 S('d') = INT, S('i') = INT,
  56                 S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT,
  57                 S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
  58                 S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
  59                 S('c') = CHAR, S('C') = INT,
  60                 S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
  61                 S('m') = NOARG,
  62                 S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
  63                 S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
  64         }, { /* 1: l-prefixed */
  65                 S('d') = LONG, S('i') = LONG,
  66                 S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG,
  67                 S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
  68                 S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
  69                 S('c') = INT, S('s') = PTR, S('n') = PTR,
  70                 S('l') = LLPRE,
  71         }, { /* 2: ll-prefixed */
  72                 S('d') = LLONG, S('i') = LLONG,
  73                 S('o') = ULLONG, S('u') = ULLONG,
  74                 S('x') = ULLONG, S('X') = ULLONG,
  75                 S('n') = PTR,
  76         }, { /* 3: h-prefixed */
  77                 S('d') = SHORT, S('i') = SHORT,
  78                 S('o') = USHORT, S('u') = USHORT,
  79                 S('x') = USHORT, S('X') = USHORT,
  80                 S('n') = PTR,
  81                 S('h') = HHPRE,
  82         }, { /* 4: hh-prefixed */
  83                 S('d') = CHAR, S('i') = CHAR,
  84                 S('o') = UCHAR, S('u') = UCHAR,
  85                 S('x') = UCHAR, S('X') = UCHAR,
  86                 S('n') = PTR,
  87         }, { /* 5: L-prefixed */
  88                 S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL,
  89                 S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL,
  90                 S('n') = PTR,
  91         }, { /* 6: z- or t-prefixed (assumed to be same size) */
  92                 S('d') = PDIFF, S('i') = PDIFF,
  93                 S('o') = SIZET, S('u') = SIZET,
  94                 S('x') = SIZET, S('X') = SIZET,
  95                 S('n') = PTR,
  96         }, { /* 7: j-prefixed */
  97                 S('d') = IMAX, S('i') = IMAX,
  98                 S('o') = UMAX, S('u') = UMAX,
  99                 S('x') = UMAX, S('X') = UMAX,
 100                 S('n') = PTR,
 101         }
 102 };
 103
 104 #define OOB(x) ((unsigned)(x)-'A' > 'z'-'A')
 105
 106 union arg
 107 {
 108         uintmax_t i;
 109 #if !defined(__wasilibc_printscan_no_floating_point)
 110 #if defined(__wasilibc_printscan_no_long_double)
 111         long_double f;
 112 #else
 113         long double f;
 114 #endif
 115 #endif
 116         void *p;
 117 };
 118
 119 static void pop_arg(union arg *arg, int type, va_list *ap)
 120 {
 121         switch (type) {
 122                case PTR:        arg->p = va_arg(*ap, void *);
 123         break; case INT:        arg->i = va_arg(*ap, int);
 124         break; case UINT:       arg->i = va_arg(*ap, unsigned int);
 125         break; case LONG:       arg->i = va_arg(*ap, long);
 126         break; case ULONG:      arg->i = va_arg(*ap, unsigned long);
 127         break; case ULLONG:     arg->i = va_arg(*ap, unsigned long long);
 128         break; case SHORT:      arg->i = (short)va_arg(*ap, int);
 129         break; case USHORT:     arg->i = (unsigned short)va_arg(*ap, int);
 130         break; case CHAR:       arg->i = (signed char)va_arg(*ap, int);
 131         break; case UCHAR:      arg->i = (unsigned char)va_arg(*ap, int);
 132         break; case LLONG:      arg->i = va_arg(*ap, long long);
 133         break; case SIZET:      arg->i = va_arg(*ap, size_t);
 134         break; case IMAX:       arg->i = va_arg(*ap, intmax_t);
 135         break; case UMAX:       arg->i = va_arg(*ap, uintmax_t);
 136         break; case PDIFF:      arg->i = va_arg(*ap, ptrdiff_t);
 137         break; case UIPTR:      arg->i = (uintptr_t)va_arg(*ap, void *);
 138 #if defined(__wasilibc_printscan_no_floating_point)
 139         break; case DBL:
 140                case LDBL:
 141         floating_point_not_supported();
 142 #else
 143         break; case DBL:        arg->f = va_arg(*ap, double);
 144 #if defined(__wasilibc_printscan_no_long_double)
 145         break; case LDBL:       long_double_not_supported();
 146 #else
 147         break; case LDBL:       arg->f = va_arg(*ap, long double);
 148 #endif
 149 #endif
 150         }
 151 }
 152
 153 static void out(FILE *f, const char *s, size_t l)
 154 {
 155         if (!(f->flags & F_ERR)) __fwritex((void *)s, l, f);
 156 }
 157
 158 static void pad(FILE *f, char c, int w, int l, int fl)
 159 {
 160         char pad[256];
 161         if (fl & (LEFT_ADJ | ZERO_PAD) || l >= w) return;
 162         l = w - l;
 163         memset(pad, c, l>sizeof pad ? sizeof pad : l);
 164         for (; l >= sizeof pad; l -= sizeof pad)
 165                 out(f, pad, sizeof pad);
 166         out(f, pad, l);
 167 }
 168
 169 static const char xdigits[16] = {
 170         "0123456789ABCDEF"
 171 };
 172
 173 static char *fmt_x(uintmax_t x, char *s, int lower)
 174 {
 175         for (; x; x>>=4) *--s = xdigits[(x&15)]|lower;
 176         return s;
 177 }
 178
 179 static char *fmt_o(uintmax_t x, char *s)
 180 {
 181         for (; x; x>>=3) *--s = '0' + (x&7);
 182         return s;
 183 }
 184
 185 static char *fmt_u(uintmax_t x, char *s)
 186 {
 187         unsigned long y;
 188         for (   ; x>ULONG_MAX; x/=10) *--s = '0' + x%10;
 189         for (y=x;           y; y/=10) *--s = '0' + y%10;
 190         return s;
 191 }
 192
 193 #if !defined(__wasilibc_printscan_no_floating_point)
 194 /* Do not override this check. The floating point printing code below
 195  * depends on the float.h constants being right. If they are wrong, it
 196  * may overflow the stack. */
 197 #if LDBL_MANT_DIG == 53
 198 #if defined(__wasilibc_printscan_no_long_double)
 199 typedef char compiler_defines_long_double_incorrectly[9-(int)sizeof(long_double)];
 200 #else
 201 typedef char compiler_defines_long_double_incorrectly[9-(int)sizeof(long double)];
 202 #endif
 203 #endif
 204
 205 #if defined(__wasilibc_printscan_no_long_double)
 206 static int fmt_fp(FILE *f, long_double y, int w, int p, int fl, int t)
 207 #else
 208 static int fmt_fp(FILE *f, long double y, int w, int p, int fl, int t)
 209 #endif
 210 {
 211         uint32_t big[(LDBL_MANT_DIG+28)/29 + 1          // mantissa expansion
 212                 + (LDBL_MAX_EXP+LDBL_MANT_DIG+28+8)/9]; // exponent expansion
 213         uint32_t *a, *d, *r, *z;
 214         int e2=0, e, i, j, l;
 215         char buf[9+LDBL_MANT_DIG/4], *s;
 216         const char *prefix="-0X+0X 0X-0x+0x 0x";
 217         int pl;
 218         char ebuf0[3*sizeof(int)], *ebuf=&ebuf0[3*sizeof(int)], *estr;
 219
 220         pl=1;
 221         if (signbit(y)) {
 222                 y=-y;
 223         } else if (fl & MARK_POS) {
 224                 prefix+=3;
 225         } else if (fl & PAD_POS) {
 226                 prefix+=6;
 227         } else prefix++, pl=0;
 228
 229         if (!isfinite(y)) {
 230                 char *s = (t&32)?"inf":"INF";
 231                 if (y!=y) s=(t&32)?"nan":"NAN";
 232                 pad(f, ' ', w, 3+pl, fl&~ZERO_PAD);
 233                 out(f, prefix, pl);
 234                 out(f, s, 3);
 235                 pad(f, ' ', w, 3+pl, fl^LEFT_ADJ);
 236                 return MAX(w, 3+pl);
 237         }
 238
 239         y = frexpl(y, &e2) * 2;
 240         if (y) e2--;
 241
 242         if ((t|32)=='a') {
 243 #if defined(__wasilibc_printscan_no_long_double)
 244                 long_double round = 8.0;
 245 #else
 246                 long double round = 8.0;
 247 #endif
 248                 int re;
 249
 250                 if (t&32) prefix += 9;
 251                 pl += 2;
 252
 253                 if (p<0 || p>=LDBL_MANT_DIG/4-1) re=0;
 254                 else re=LDBL_MANT_DIG/4-1-p;
 255
 256                 if (re) {
 257                         round *= 1<<(LDBL_MANT_DIG%4);
 258                         while (re--) round*=16;
 259                         if (*prefix=='-') {
 260                                 y=-y;
 261                                 y-=round;
 262                                 y+=round;
 263                                 y=-y;
 264                         } else {
 265                                 y+=round;
 266                                 y-=round;
 267                         }
 268                 }
 269
 270                 estr=fmt_u(e2<0 ? -e2 : e2, ebuf);
 271                 if (estr==ebuf) *--estr='0';
 272                 *--estr = (e2<0 ? '-' : '+');
 273                 *--estr = t+('p'-'a');
 274
 275                 s=buf;
 276                 do {
 277                         int x=y;
 278                         *s++=xdigits[x]|(t&32);
 279                         y=16*(y-x);
 280                         if (s-buf==1 && (y||p>0||(fl&ALT_FORM))) *s++='.';
 281                 } while (y);
 282
 283                 if (p > INT_MAX-2-(ebuf-estr)-pl)
 284                         return -1;
 285                 if (p && s-buf-2 < p)
 286                         l = (p+2) + (ebuf-estr);
 287                 else
 288                         l = (s-buf) + (ebuf-estr);
 289
 290                 pad(f, ' ', w, pl+l, fl);
 291                 out(f, prefix, pl);
 292                 pad(f, '0', w, pl+l, fl^ZERO_PAD);
 293                 out(f, buf, s-buf);
 294                 pad(f, '0', l-(ebuf-estr)-(s-buf), 0, 0);
 295                 out(f, estr, ebuf-estr);
 296                 pad(f, ' ', w, pl+l, fl^LEFT_ADJ);
 297                 return MAX(w, pl+l);
 298         }
 299         if (p<0) p=6;
 300
 301         if (y) y *= 0x1p28, e2-=28;
 302
 303         if (e2<0) a=r=z=big;
 304         else a=r=z=big+sizeof(big)/sizeof(*big) - LDBL_MANT_DIG - 1;
 305
 306         do {
 307                 *z = y;
 308                 y = 1000000000*(y-*z++);
 309         } while (y);
 310
 311         while (e2>0) {
 312                 uint32_t carry=0;
 313                 int sh=MIN(29,e2);
 314                 for (d=z-1; d>=a; d--) {
 315                         uint64_t x = ((uint64_t)*d<<sh)+carry;
 316                         *d = x % 1000000000;
 317                         carry = x / 1000000000;
 318                 }
 319                 if (carry) *--a = carry;
 320                 while (z>a && !z[-1]) z--;
 321                 e2-=sh;
 322         }
 323         while (e2<0) {
 324                 uint32_t carry=0, *b;
 325                 int sh=MIN(9,-e2), need=1+(p+LDBL_MANT_DIG/3U+8)/9;
 326                 for (d=a; d<z; d++) {
 327                         uint32_t rm = *d & (1<<sh)-1;
 328                         *d = (*d>>sh) + carry;
 329                         carry = (1000000000>>sh) * rm;
 330                 }
 331                 if (!*a) a++;
 332                 if (carry) *z++ = carry;
 333                 /* Avoid (slow!) computation past requested precision */
 334                 b = (t|32)=='f' ? r : a;
 335                 if (z-b > need) z = b+need;
 336                 e2+=sh;
 337         }
 338
 339         if (a<z) for (i=10, e=9*(r-a); *a>=i; i*=10, e++);
 340         else e=0;
 341
 342         /* Perform rounding: j is precision after the radix (possibly neg) */
 343         j = p - ((t|32)!='f')*e - ((t|32)=='g' && p);
 344         if (j < 9*(z-r-1)) {
 345                 uint32_t x;
 346                 /* We avoid C's broken division of negative numbers */
 347                 d = r + 1 + ((j+9*LDBL_MAX_EXP)/9 - LDBL_MAX_EXP);
 348                 j += 9*LDBL_MAX_EXP;
 349                 j %= 9;
 350                 for (i=10, j++; j<9; i*=10, j++);
 351                 x = *d % i;
 352                 /* Are there any significant digits past j? */
 353                 if (x || d+1!=z) {
 354 #if defined(__wasilibc_printscan_no_long_double)
 355                         long_double round = 2/LDBL_EPSILON;
 356                         long_double small;
 357 #else
 358                         long double round = 2/LDBL_EPSILON;
 359                         long double small;
 360 #endif
 361                         if ((*d/i & 1) || (i==1000000000 && d>a && (d[-1]&1)))
 362                                 round += 2;
 363                         if (x<i/2) small=0x0.8p0;
 364                         else if (x==i/2 && d+1==z) small=0x1.0p0;
 365                         else small=0x1.8p0;
 366                         if (pl && *prefix=='-') round*=-1, small*=-1;
 367                         *d -= x;
 368                         /* Decide whether to round by probing round+small */
 369                         if (round+small != round) {
 370                                 *d = *d + i;
 371                                 while (*d > 999999999) {
 372                                         *d--=0;
 373                                         if (d<a) *--a=0;
 374                                         (*d)++;
 375                                 }
 376                                 for (i=10, e=9*(r-a); *a>=i; i*=10, e++);
 377                         }
 378                 }
 379                 if (z>d+1) z=d+1;
 380         }
 381         for (; z>a && !z[-1]; z--);
 382
 383         if ((t|32)=='g') {
 384                 if (!p) p++;
 385                 if (p>e && e>=-4) {
 386                         t--;
 387                         p-=e+1;
 388                 } else {
 389                         t-=2;
 390                         p--;
 391                 }
 392                 if (!(fl&ALT_FORM)) {
 393                         /* Count trailing zeros in last place */
 394                         if (z>a && z[-1]) for (i=10, j=0; z[-1]%i==0; i*=10, j++);
 395                         else j=9;
 396                         if ((t|32)=='f')
 397                                 p = MIN(p,MAX(0,9*(z-r-1)-j));
 398                         else
 399                                 p = MIN(p,MAX(0,9*(z-r-1)+e-j));
 400                 }
 401         }
 402         if (p > INT_MAX-1-(p || (fl&ALT_FORM)))
 403                 return -1;
 404         l = 1 + p + (p || (fl&ALT_FORM));
 405         if ((t|32)=='f') {
 406                 if (e > INT_MAX-l) return -1;
 407                 if (e>0) l+=e;
 408         } else {
 409                 estr=fmt_u(e<0 ? -e : e, ebuf);
 410                 while(ebuf-estr<2) *--estr='0';
 411                 *--estr = (e<0 ? '-' : '+');
 412                 *--estr = t;
 413                 if (ebuf-estr > INT_MAX-l) return -1;
 414                 l += ebuf-estr;
 415         }
 416
 417         if (l > INT_MAX-pl) return -1;
 418         pad(f, ' ', w, pl+l, fl);
 419         out(f, prefix, pl);
 420         pad(f, '0', w, pl+l, fl^ZERO_PAD);
 421
 422         if ((t|32)=='f') {
 423                 if (a>r) a=r;
 424                 for (d=a; d<=r; d++) {
 425                         char *s = fmt_u(*d, buf+9);
 426                         if (d!=a) while (s>buf) *--s='0';
 427                         else if (s==buf+9) *--s='0';
 428                         out(f, s, buf+9-s);
 429                 }
 430                 if (p || (fl&ALT_FORM)) out(f, ".", 1);
 431                 for (; d<z && p>0; d++, p-=9) {
 432                         char *s = fmt_u(*d, buf+9);
 433                         while (s>buf) *--s='0';
 434                         out(f, s, MIN(9,p));
 435                 }
 436                 pad(f, '0', p+9, 9, 0);
 437         } else {
 438                 if (z<=a) z=a+1;
 439                 for (d=a; d<z && p>=0; d++) {
 440                         char *s = fmt_u(*d, buf+9);
 441                         if (s==buf+9) *--s='0';
 442                         if (d!=a) while (s>buf) *--s='0';
 443                         else {
 444                                 out(f, s++, 1);
 445                                 if (p>0||(fl&ALT_FORM)) out(f, ".", 1);
 446                         }
 447                         out(f, s, MIN(buf+9-s, p));
 448                         p -= buf+9-s;
 449                 }
 450                 pad(f, '0', p+18, 18, 0);
 451                 out(f, estr, ebuf-estr);
 452         }
 453
 454         pad(f, ' ', w, pl+l, fl^LEFT_ADJ);
 455
 456         return MAX(w, pl+l);
 457 }
 458 #endif
 459
 460 static int getint(char **s) {
 461         int i;
 462         for (i=0; isdigit(**s); (*s)++) {
 463                 if (i > INT_MAX/10U || **s-'0' > INT_MAX-10*i) i = -1;
 464                 else i = 10*i + (**s-'0');
 465         }
 466         return i;
 467 }
 468
 469 static int printf_core(FILE *f, const char *fmt, va_list *ap, union arg *nl_arg, int *nl_type)
 470 {
 471         char *a, *z, *s=(char *)fmt;
 472         unsigned l10n=0, fl;
 473         int w, p, xp;
 474         union arg arg;
 475         int argpos;
 476         unsigned st, ps;
 477         int cnt=0, l=0;
 478         size_t i;
 479         char buf[sizeof(uintmax_t)*3+3+LDBL_MANT_DIG/4];
 480         const char *prefix;
 481         int t, pl;
 482         wchar_t wc[2], *ws;
 483         char mb[4];
 484
 485         for (;;) {
 486                 /* This error is only specified for snprintf, but since it's
 487                  * unspecified for other forms, do the same. Stop immediately
 488                  * on overflow; otherwise %n could produce wrong results. */
 489                 if (l > INT_MAX - cnt) goto overflow;
 490
 491                 /* Update output count, end loop when fmt is exhausted */
 492                 cnt += l;
 493                 if (!*s) break;
 494
 495                 /* Handle literal text and %% format specifiers */
 496                 for (a=s; *s && *s!='%'; s++);
 497                 for (z=s; s[0]=='%' && s[1]=='%'; z++, s+=2);
 498                 if (z-a > INT_MAX-cnt) goto overflow;
 499                 l = z-a;
 500                 if (f) out(f, a, l);
 501                 if (l) continue;
 502
 503                 if (isdigit(s[1]) && s[2]=='$') {
 504                         l10n=1;
 505                         argpos = s[1]-'0';
 506                         s+=3;
 507                 } else {
 508                         argpos = -1;
 509                         s++;
 510                 }
 511
 512                 /* Read modifier flags */
 513                 for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++)
 514                         fl |= 1U<<*s-' ';
 515
 516                 /* Read field width */
 517                 if (*s=='*') {
 518                         if (isdigit(s[1]) && s[2]=='$') {
 519                                 l10n=1;
 520                                 nl_type[s[1]-'0'] = INT;
 521                                 w = nl_arg[s[1]-'0'].i;
 522                                 s+=3;
 523                         } else if (!l10n) {
 524                                 w = f ? va_arg(*ap, int) : 0;
 525                                 s++;
 526                         } else goto inval;
 527                         if (w<0) fl|=LEFT_ADJ, w=-w;
 528                 } else if ((w=getint(&s))<0) goto overflow;
 529
 530                 /* Read precision */
 531                 if (*s=='.' && s[1]=='*') {
 532                         if (isdigit(s[2]) && s[3]=='$') {
 533                                 nl_type[s[2]-'0'] = INT;
 534                                 p = nl_arg[s[2]-'0'].i;
 535                                 s+=4;
 536                         } else if (!l10n) {
 537                                 p = f ? va_arg(*ap, int) : 0;
 538                                 s+=2;
 539                         } else goto inval;
 540                         xp = (p>=0);
 541                 } else if (*s=='.') {
 542                         s++;
 543                         p = getint(&s);
 544                         xp = 1;
 545                 } else {
 546                         p = -1;
 547                         xp = 0;
 548                 }
 549
 550                 /* Format specifier state machine */
 551                 st=0;
 552                 do {
 553                         if (OOB(*s)) goto inval;
 554                         ps=st;
 555                         st=states[st]S(*s++);
 556                 } while (st-1<STOP);
 557                 if (!st) goto inval;
 558
 559                 /* Check validity of argument type (nl/normal) */
 560                 if (st==NOARG) {
 561                         if (argpos>=0) goto inval;
 562                 } else {
 563                         if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos];
 564                         else if (f) pop_arg(&arg, st, ap);
 565                         else return 0;
 566                 }
 567
 568                 if (!f) continue;
 569
 570                 z = buf + sizeof(buf);
 571                 prefix = "-+   0X0x";
 572                 pl = 0;
 573                 t = s[-1];
 574
 575                 /* Transform ls,lc -> S,C */
 576                 if (ps && (t&15)==3) t&=~32;
 577
 578                 /* - and 0 flags are mutually exclusive */
 579                 if (fl & LEFT_ADJ) fl &= ~ZERO_PAD;
 580
 581                 switch(t) {
 582                 case 'n':
 583                         switch(ps) {
 584                         case BARE: *(int *)arg.p = cnt; break;
 585                         case LPRE: *(long *)arg.p = cnt; break;
 586                         case LLPRE: *(long long *)arg.p = cnt; break;
 587                         case HPRE: *(unsigned short *)arg.p = cnt; break;
 588                         case HHPRE: *(unsigned char *)arg.p = cnt; break;
 589                         case ZTPRE: *(size_t *)arg.p = cnt; break;
 590                         case JPRE: *(uintmax_t *)arg.p = cnt; break;
 591                         }
 592                         continue;
 593                 case 'p':
 594                         p = MAX(p, 2*sizeof(void*));
 595                         t = 'x';
 596                         fl |= ALT_FORM;
 597                 case 'x': case 'X':
 598                         a = fmt_x(arg.i, z, t&32);
 599                         if (arg.i && (fl & ALT_FORM)) prefix+=(t>>4), pl=2;
 600                         if (0) {
 601                 case 'o':
 602                         a = fmt_o(arg.i, z);
 603                         if ((fl&ALT_FORM) && p<z-a+1) p=z-a+1;
 604                         } if (0) {
 605                 case 'd': case 'i':
 606                         pl=1;
 607                         if (arg.i>INTMAX_MAX) {
 608                                 arg.i=-arg.i;
 609                         } else if (fl & MARK_POS) {
 610                                 prefix++;
 611                         } else if (fl & PAD_POS) {
 612                                 prefix+=2;
 613                         } else pl=0;
 614                 case 'u':
 615                         a = fmt_u(arg.i, z);
 616                         }
 617                         if (xp && p<0) goto overflow;
 618                         if (xp) fl &= ~ZERO_PAD;
 619                         if (!arg.i && !p) {
 620                                 a=z;
 621                                 break;
 622                         }
 623                         p = MAX(p, z-a + !arg.i);
 624                         break;
 625                 case 'c':
 626                         *(a=z-(p=1))=arg.i;
 627                         fl &= ~ZERO_PAD;
 628                         break;
 629                 case 'm':
 630                         if (1) a = strerror(errno); else
 631                 case 's':
 632                         a = arg.p ? arg.p : "(null)";
 633                         z = a + strnlen(a, p<0 ? INT_MAX : p);
 634                         if (p<0 && *z) goto overflow;
 635                         p = z-a;
 636                         fl &= ~ZERO_PAD;
 637                         break;
 638                 case 'C':
 639                         wc[0] = arg.i;
 640                         wc[1] = 0;
 641                         arg.p = wc;
 642                         p = -1;
 643                 case 'S':
 644                         ws = arg.p;
 645                         for (i=l=0; i<p && *ws && (l=wctomb(mb, *ws++))>=0 && l<=p-i; i+=l);
 646                         if (l<0) return -1;
 647                         if (i > INT_MAX) goto overflow;
 648                         p = i;
 649                         pad(f, ' ', w, p, fl);
 650                         ws = arg.p;
 651                         for (i=0; i<0U+p && *ws && i+(l=wctomb(mb, *ws++))<=p; i+=l)
 652                                 out(f, mb, l);
 653                         pad(f, ' ', w, p, fl^LEFT_ADJ);
 654                         l = w>p ? w : p;
 655                         continue;
 656 #if !defined(__wasilibc_printscan_no_floating_point)
 657                 case 'e': case 'f': case 'g': case 'a':
 658                 case 'E': case 'F': case 'G': case 'A':
 659                         if (xp && p<0) goto overflow;
 660                         l = fmt_fp(f, arg.f, w, p, fl, t);
 661                         if (l<0) goto overflow;
 662                         continue;
 663 #endif
 664                 }
 665
 666                 if (p < z-a) p = z-a;
 667                 if (p > INT_MAX-pl) goto overflow;
 668                 if (w < pl+p) w = pl+p;
 669                 if (w > INT_MAX-cnt) goto overflow;
 670
 671                 pad(f, ' ', w, pl+p, fl);
 672                 out(f, prefix, pl);
 673                 pad(f, '0', w, pl+p, fl^ZERO_PAD);
 674                 pad(f, '0', p, z-a, 0);
 675                 out(f, a, z-a);
 676                 pad(f, ' ', w, pl+p, fl^LEFT_ADJ);
 677
 678                 l = w;
 679         }
 680
 681         if (f) return cnt;
 682         if (!l10n) return 0;
 683
 684         for (i=1; i<=NL_ARGMAX && nl_type[i]; i++)
 685                 pop_arg(nl_arg+i, nl_type[i], ap);
 686         for (; i<=NL_ARGMAX && !nl_type[i]; i++);
 687         if (i<=NL_ARGMAX) goto inval;
 688         return 1;
 689
 690 inval:
 691         errno = EINVAL;
 692         return -1;
 693 overflow:
 694         errno = EOVERFLOW;
 695         return -1;
 696 }
 697
 698 int vfprintf(FILE *restrict f, const char *restrict fmt, va_list ap)
 699 {
 700         va_list ap2;
 701         int nl_type[NL_ARGMAX+1] = {0};
 702         union arg nl_arg[NL_ARGMAX+1];
 703         unsigned char internal_buf[80], *saved_buf = 0;
 704         int olderr;
 705         int ret;
 706
 707         /* the copy allows passing va_list* even if va_list is an array */
 708         va_copy(ap2, ap);
 709         if (printf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) {
 710                 va_end(ap2);
 711                 return -1;
 712         }
 713
 714         FLOCK(f);
 715         olderr = f->flags & F_ERR;
 716         if (f->mode < 1) f->flags &= ~F_ERR;
 717         if (!f->buf_size) {
 718                 saved_buf = f->buf;
 719                 f->buf = internal_buf;
 720                 f->buf_size = sizeof internal_buf;
 721                 f->wpos = f->wbase = f->wend = 0;
 722         }
 723         if (!f->wend && __towrite(f)) ret = -1;
 724         else ret = printf_core(f, fmt, &ap2, nl_arg, nl_type);
 725         if (saved_buf) {
 726                 f->write(f, 0, 0);
 727                 if (!f->wpos) ret = -1;
 728                 f->buf = saved_buf;
 729                 f->buf_size = 0;
 730                 f->wpos = f->wbase = f->wend = 0;
 731         }
 732         if (f->flags & F_ERR) ret = -1;
 733         f->flags |= olderr;
 734         FUNLOCK(f);
 735         va_end(ap2);
 736         return ret;
 737 }