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Format changes to musl code to fit musl's style.
[wasi-libc.git] / libc-top-half / musl / src / stdio / vfwprintf.c
CommitLineData
320054e8
DG		 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>
e5f14be3 11#ifdef __wasilibc_unmodified_upstream // Changes to optimize printf/scanf when long double isn't needed
320054e8
DG		 12#else
13#include "printscan.h"
14#endif
15
16/* Convenient bit representation for modifier flags, which all fall
17 * within 31 codepoints of the space character. */
18
19#define ALT_FORM (1U<<'#'-' ')
20#define ZERO_PAD (1U<<'0'-' ')
21#define LEFT_ADJ (1U<<'-'-' ')
22#define PAD_POS (1U<<' '-' ')
23#define MARK_POS (1U<<'+'-' ')
24#define GROUPED (1U<<'\''-' ')
25
26#define FLAGMASK (ALT_FORM|ZERO_PAD|LEFT_ADJ|PAD_POS|MARK_POS|GROUPED)
27
28/* State machine to accept length modifiers + conversion specifiers.
29 * Result is 0 on failure, or an argument type to pop on success. */
30
31enum {
32 BARE, LPRE, LLPRE, HPRE, HHPRE, BIGLPRE,
33 ZTPRE, JPRE,
34 STOP,
35 PTR, INT, UINT, ULLONG,
36 LONG, ULONG,
37 SHORT, USHORT, CHAR, UCHAR,
38 LLONG, SIZET, IMAX, UMAX, PDIFF, UIPTR,
39 DBL, LDBL,
40 NOARG,
41 MAXSTATE
42};
43
44#define S(x) [(x)-'A']
45
46static const unsigned char states[]['z'-'A'+1] = {
47 { /* 0: bare types */
48 S('d') = INT, S('i') = INT,
49 S('o') = UINT, S('u') = UINT, S('x') = UINT, S('X') = UINT,
50 S('e') = DBL, S('f') = DBL, S('g') = DBL, S('a') = DBL,
51 S('E') = DBL, S('F') = DBL, S('G') = DBL, S('A') = DBL,
52 S('c') = CHAR, S('C') = INT,
53 S('s') = PTR, S('S') = PTR, S('p') = UIPTR, S('n') = PTR,
54 S('m') = NOARG,
55 S('l') = LPRE, S('h') = HPRE, S('L') = BIGLPRE,
56 S('z') = ZTPRE, S('j') = JPRE, S('t') = ZTPRE,
57 }, { /* 1: l-prefixed */
58 S('d') = LONG, S('i') = LONG,
59 S('o') = ULONG, S('u') = ULONG, S('x') = ULONG, S('X') = ULONG,
60 S('c') = INT, S('s') = PTR, S('n') = PTR,
61 S('l') = LLPRE,
62 }, { /* 2: ll-prefixed */
63 S('d') = LLONG, S('i') = LLONG,
64 S('o') = ULLONG, S('u') = ULLONG,
65 S('x') = ULLONG, S('X') = ULLONG,
66 S('n') = PTR,
67 }, { /* 3: h-prefixed */
68 S('d') = SHORT, S('i') = SHORT,
69 S('o') = USHORT, S('u') = USHORT,
70 S('x') = USHORT, S('X') = USHORT,
71 S('n') = PTR,
72 S('h') = HHPRE,
73 }, { /* 4: hh-prefixed */
74 S('d') = CHAR, S('i') = CHAR,
75 S('o') = UCHAR, S('u') = UCHAR,
76 S('x') = UCHAR, S('X') = UCHAR,
77 S('n') = PTR,
78 }, { /* 5: L-prefixed */
79 S('e') = LDBL, S('f') = LDBL, S('g') = LDBL, S('a') = LDBL,
80 S('E') = LDBL, S('F') = LDBL, S('G') = LDBL, S('A') = LDBL,
81 S('n') = PTR,
82 }, { /* 6: z- or t-prefixed (assumed to be same size) */
83 S('d') = PDIFF, S('i') = PDIFF,
84 S('o') = SIZET, S('u') = SIZET,
85 S('x') = SIZET, S('X') = SIZET,
86 S('n') = PTR,
87 }, { /* 7: j-prefixed */
88 S('d') = IMAX, S('i') = IMAX,
89 S('o') = UMAX, S('u') = UMAX,
90 S('x') = UMAX, S('X') = UMAX,
91 S('n') = PTR,
92 }
93};
94
95#define OOB(x) ((unsigned)(x)-'A' > 'z'-'A')
96
97union arg
98{
99 uintmax_t i;
100#if !defined(__wasilibc_printscan_no_floating_point)
101#if defined(__wasilibc_printscan_no_long_double)
102 long_double f;
103#else
104 long double f;
105#endif
106#endif
107 void *p;
108};
109
110static void pop_arg(union arg *arg, int type, va_list *ap)
111{
112 switch (type) {
113 case PTR: arg->p = va_arg(*ap, void *);
114 break; case INT: arg->i = va_arg(*ap, int);
115 break; case UINT: arg->i = va_arg(*ap, unsigned int);
116 break; case LONG: arg->i = va_arg(*ap, long);
117 break; case ULONG: arg->i = va_arg(*ap, unsigned long);
118 break; case ULLONG: arg->i = va_arg(*ap, unsigned long long);
119 break; case SHORT: arg->i = (short)va_arg(*ap, int);
120 break; case USHORT: arg->i = (unsigned short)va_arg(*ap, int);
121 break; case CHAR: arg->i = (signed char)va_arg(*ap, int);
122 break; case UCHAR: arg->i = (unsigned char)va_arg(*ap, int);
123 break; case LLONG: arg->i = va_arg(*ap, long long);
124 break; case SIZET: arg->i = va_arg(*ap, size_t);
125 break; case IMAX: arg->i = va_arg(*ap, intmax_t);
126 break; case UMAX: arg->i = va_arg(*ap, uintmax_t);
127 break; case PDIFF: arg->i = va_arg(*ap, ptrdiff_t);
128 break; case UIPTR: arg->i = (uintptr_t)va_arg(*ap, void *);
129#if defined(__wasilibc_printscan_no_floating_point)
130 break; case DBL:
131 break; case LDBL: floating_point_not_supported();
132#else
133 break; case DBL: arg->f = va_arg(*ap, double);
134#if defined(__wasilibc_printscan_no_long_double)
135 break; case LDBL: long_double_not_supported();
136#else
137 break; case LDBL: arg->f = va_arg(*ap, long double);
138#endif
139#endif
140 }
141}
142
143static void out(FILE *f, const wchar_t *s, size_t l)
144{
145 while (l-- && !(f->flags & F_ERR)) fputwc(*s++, f);
146}
147
148static int getint(wchar_t **s) {
149 int i;
150 for (i=0; iswdigit(**s); (*s)++) {
151 if (i > INT_MAX/10U || **s-'0' > INT_MAX-10*i) i = -1;
152 else i = 10*i + (**s-'0');
153 }
154 return i;
155}
156
157static const char sizeprefix['y'-'a'] = {
158['a'-'a']='L', ['e'-'a']='L', ['f'-'a']='L', ['g'-'a']='L',
159['d'-'a']='j', ['i'-'a']='j', ['o'-'a']='j', ['u'-'a']='j', ['x'-'a']='j',
160['p'-'a']='j'
161};
162
163static int wprintf_core(FILE *f, const wchar_t *fmt, va_list *ap, union arg *nl_arg, int *nl_type)
164{
165 wchar_t *a, *z, *s=(wchar_t *)fmt;
166 unsigned l10n=0, fl;
167 int w, p, xp;
168 union arg arg;
169 int argpos;
170 unsigned st, ps;
171 int cnt=0, l=0;
172 int i;
173 int t;
174 char *bs;
175 char charfmt[16];
176 wchar_t wc;
177
178 for (;;) {
179 /* This error is only specified for snprintf, but since it's
180 * unspecified for other forms, do the same. Stop immediately
181 * on overflow; otherwise %n could produce wrong results. */
182 if (l > INT_MAX - cnt) goto overflow;
183
184 /* Update output count, end loop when fmt is exhausted */
185 cnt += l;
186 if (!*s) break;
187
188 /* Handle literal text and %% format specifiers */
189 for (a=s; *s && *s!='%'; s++);
190 for (z=s; s[0]=='%' && s[1]=='%'; z++, s+=2);
191 if (z-a > INT_MAX-cnt) goto overflow;
192 l = z-a;
193 if (f) out(f, a, l);
194 if (l) continue;
195
196 if (iswdigit(s[1]) && s[2]=='$') {
197 l10n=1;
198 argpos = s[1]-'0';
199 s+=3;
200 } else {
201 argpos = -1;
202 s++;
203 }
204
205 /* Read modifier flags */
206 for (fl=0; (unsigned)*s-' '<32 && (FLAGMASK&(1U<<*s-' ')); s++)
207 fl |= 1U<<*s-' ';
208
209 /* Read field width */
210 if (*s=='*') {
211 if (iswdigit(s[1]) && s[2]=='$') {
212 l10n=1;
213 nl_type[s[1]-'0'] = INT;
214 w = nl_arg[s[1]-'0'].i;
215 s+=3;
216 } else if (!l10n) {
217 w = f ? va_arg(*ap, int) : 0;
218 s++;
219 } else goto inval;
220 if (w<0) fl|=LEFT_ADJ, w=-w;
221 } else if ((w=getint(&s))<0) goto overflow;
222
223 /* Read precision */
224 if (*s=='.' && s[1]=='*') {
225 if (isdigit(s[2]) && s[3]=='$') {
226 nl_type[s[2]-'0'] = INT;
227 p = nl_arg[s[2]-'0'].i;
228 s+=4;
229 } else if (!l10n) {
230 p = f ? va_arg(*ap, int) : 0;
231 s+=2;
232 } else goto inval;
233 xp = (p>=0);
234 } else if (*s=='.') {
235 s++;
236 p = getint(&s);
237 xp = 1;
238 } else {
239 p = -1;
240 xp = 0;
241 }
242
243 /* Format specifier state machine */
244 st=0;
245 do {
246 if (OOB(*s)) goto inval;
247 ps=st;
248 st=states[st]S(*s++);
249 } while (st-1<STOP);
250 if (!st) goto inval;
251
252 /* Check validity of argument type (nl/normal) */
253 if (st==NOARG) {
254 if (argpos>=0) goto inval;
255 } else {
256 if (argpos>=0) nl_type[argpos]=st, arg=nl_arg[argpos];
257 else if (f) pop_arg(&arg, st, ap);
258 else return 0;
259 }
260
261 if (!f) continue;
262 t = s[-1];
263 if (ps && (t&15)==3) t&=~32;
264
265 switch (t) {
266 case 'n':
267 switch(ps) {
268 case BARE: *(int *)arg.p = cnt; break;
269 case LPRE: *(long *)arg.p = cnt; break;
270 case LLPRE: *(long long *)arg.p = cnt; break;
271 case HPRE: *(unsigned short *)arg.p = cnt; break;
272 case HHPRE: *(unsigned char *)arg.p = cnt; break;
273 case ZTPRE: *(size_t *)arg.p = cnt; break;
274 case JPRE: *(uintmax_t *)arg.p = cnt; break;
275 }
276 continue;
277 case 'c':
278 if (w<1) w=1;
279 if (w>1 && !(fl&LEFT_ADJ)) fprintf(f, "%*s", w-1, "");
280 fputwc(btowc(arg.i), f);
281 if (w>1 && (fl&LEFT_ADJ)) fprintf(f, "%*s", w-1, "");
282 l = w;
283 continue;
284 case 'C':
285 fputwc(arg.i, f);
286 l = 1;
287 continue;
288 case 'S':
289 a = arg.p;
290 z = a + wcsnlen(a, p<0 ? INT_MAX : p);
291 if (p<0 && *z) goto overflow;
292 p = z-a;
293 if (w<p) w=p;
294 if (!(fl&LEFT_ADJ)) fprintf(f, "%*s", w-p, "");
295 out(f, a, p);
296 if ((fl&LEFT_ADJ)) fprintf(f, "%*s", w-p, "");
297 l=w;
298 continue;
299 case 'm':
300 arg.p = strerror(errno);
301 case 's':
302 if (!arg.p) arg.p = "(null)";
303 bs = arg.p;
304 for (i=l=0; l<(p<0?INT_MAX:p) && (i=mbtowc(&wc, bs, MB_LEN_MAX))>0; bs+=i, l++);
305 if (i<0) return -1;
306 if (p<0 && *bs) goto overflow;
307 p=l;
308 if (w<p) w=p;
309 if (!(fl&LEFT_ADJ)) fprintf(f, "%*s", w-p, "");
310 bs = arg.p;
311 while (l--) {
312 i=mbtowc(&wc, bs, MB_LEN_MAX);
313 bs+=i;
314 fputwc(wc, f);
315 }
316 if ((fl&LEFT_ADJ)) fprintf(f, "%*s", w-p, "");
317 l=w;
318 continue;
319 }
320
321 if (xp && p<0) goto overflow;
322#if defined(__wasilibc_printscan_no_long_double)
ec9f1c39 323 // Omit the 'L' modifier for floating-point cases.
320054e8
DG		 324 switch (t|32) {
325 case 'a': case 'e': case 'f': case 'g':
326 snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c",
327 "#"+!(fl & ALT_FORM),
328 "+"+!(fl & MARK_POS),
329 "-"+!(fl & LEFT_ADJ),
330 " "+!(fl & PAD_POS),
331 "0"+!(fl & ZERO_PAD),
332 t);
333
334 l = fprintf(f, charfmt, w, p, arg.f);
335 break;
336 case 'd': case 'i': case 'o': case 'u': case 'x': case 'p':
337 snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c%c",
338 "#"+!(fl & ALT_FORM),
339 "+"+!(fl & MARK_POS),
340 "-"+!(fl & LEFT_ADJ),
341 " "+!(fl & PAD_POS),
342 "0"+!(fl & ZERO_PAD),
343 sizeprefix[(t|32)-'a'], t);
344
345 l = fprintf(f, charfmt, w, p, arg.i);
346 break;
347 }
348#else
349 snprintf(charfmt, sizeof charfmt, "%%%s%s%s%s%s*.*%c%c",
350 "#"+!(fl & ALT_FORM),
351 "+"+!(fl & MARK_POS),
352 "-"+!(fl & LEFT_ADJ),
353 " "+!(fl & PAD_POS),
354 "0"+!(fl & ZERO_PAD),
355 sizeprefix[(t|32)-'a'], t);
356
357 switch (t|32) {
358 case 'a': case 'e': case 'f': case 'g':
359 l = fprintf(f, charfmt, w, p, arg.f);
360 break;
361 case 'd': case 'i': case 'o': case 'u': case 'x': case 'p':
362 l = fprintf(f, charfmt, w, p, arg.i);
363 break;
364 }
365#endif
366 }
367
368 if (f) return cnt;
369 if (!l10n) return 0;
370
371 for (i=1; i<=NL_ARGMAX && nl_type[i]; i++)
372 pop_arg(nl_arg+i, nl_type[i], ap);
373 for (; i<=NL_ARGMAX && !nl_type[i]; i++);
374 if (i<=NL_ARGMAX) return -1;
375 return 1;
376
377inval:
378 errno = EINVAL;
379 return -1;
380overflow:
381 errno = EOVERFLOW;
382 return -1;
383}
384
385int vfwprintf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
386{
387 va_list ap2;
388 int nl_type[NL_ARGMAX] = {0};
389 union arg nl_arg[NL_ARGMAX];
390 int olderr;
391 int ret;
392
393 /* the copy allows passing va_list* even if va_list is an array */
394 va_copy(ap2, ap);
395 if (wprintf_core(0, fmt, &ap2, nl_arg, nl_type) < 0) {
396 va_end(ap2);
397 return -1;
398 }
399
400 FLOCK(f);
401 fwide(f, 1);
402 olderr = f->flags & F_ERR;
403 f->flags &= ~F_ERR;
404 ret = wprintf_core(f, fmt, &ap2, nl_arg, nl_type);
405 if (f->flags & F_ERR) ret = -1;
406 f->flags |= olderr;
407 FUNLOCK(f);
408 va_end(ap2);
409 return ret;
410}
backport for Debian buster