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