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