remove useless null check before call to free in fclose
[oweals/musl.git] / src / stdio / vfwscanf.c
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <stdarg.h>
4 #include <ctype.h>
5 #include <wchar.h>
6 #include <wctype.h>
7 #include <limits.h>
8 #include <string.h>
9
10 #include "stdio_impl.h"
11 #include "shgetc.h"
12 #include "intscan.h"
13 #include "floatscan.h"
14 #include "libc.h"
15
16 #define SIZE_hh -2
17 #define SIZE_h  -1
18 #define SIZE_def 0
19 #define SIZE_l   1
20 #define SIZE_L   2
21 #define SIZE_ll  3
22
23 static void store_int(void *dest, int size, unsigned long long i)
24 {
25         if (!dest) return;
26         switch (size) {
27         case SIZE_hh:
28                 *(char *)dest = i;
29                 break;
30         case SIZE_h:
31                 *(short *)dest = i;
32                 break;
33         case SIZE_def:
34                 *(int *)dest = i;
35                 break;
36         case SIZE_l:
37                 *(long *)dest = i;
38                 break;
39         case SIZE_ll:
40                 *(long long *)dest = i;
41                 break;
42         }
43 }
44
45 static void *arg_n(va_list ap, unsigned int n)
46 {
47         void *p;
48         unsigned int i;
49         va_list ap2;
50         va_copy(ap2, ap);
51         for (i=n; i>1; i--) va_arg(ap2, void *);
52         p = va_arg(ap2, void *);
53         va_end(ap2);
54         return p;
55 }
56
57 static int in_set(const wchar_t *set, int c)
58 {
59         int j;
60         const wchar_t *p = set;
61         if (*p == '-') {
62                 if (c=='-') return 1;
63                 p++;
64         } else if (*p == ']') {
65                 if (c==']') return 1;
66                 p++;
67         }
68         for (; *p && *p != ']'; p++) {
69                 if (*p=='-' && p[1] && p[1] != ']')
70                         for (j=p++[-1]; j<*p; j++)
71                                 if (c==j) return 1;
72                 if (c==*p) return 1;
73         }
74         return 0;
75 }
76
77 #if 1
78 #undef getwc
79 #define getwc(f) \
80         ((f)->rpos < (f)->rend && *(f)->rpos < 128 ? *(f)->rpos++ : (getwc)(f))
81
82 #undef ungetwc
83 #define ungetwc(c,f) \
84         ((f)->rend && (c)<128U ? *--(f)->rpos : ungetwc((c),(f)))
85 #endif
86
87 int vfwscanf(FILE *restrict f, const wchar_t *restrict fmt, va_list ap)
88 {
89         int width;
90         int size;
91         int alloc;
92         const wchar_t *p;
93         int c, t;
94         char *s;
95         wchar_t *wcs;
96         void *dest=NULL;
97         int invert;
98         int matches=0;
99         off_t pos = 0, cnt;
100         static const char size_pfx[][3] = { "hh", "h", "", "l", "L", "ll" };
101         char tmp[3*sizeof(int)+10];
102         const wchar_t *set;
103         size_t i, k;
104
105         FLOCK(f);
106
107         fwide(f, 1);
108
109         for (p=fmt; *p; p++) {
110
111                 alloc = 0;
112
113                 if (iswspace(*p)) {
114                         while (iswspace(p[1])) p++;
115                         while (iswspace((c=getwc(f)))) pos++;
116                         ungetwc(c, f);
117                         continue;
118                 }
119                 if (*p != '%' || p[1] == '%') {
120                         if (*p == '%') {
121                                 p++;
122                                 while (iswspace((c=getwc(f)))) pos++;
123                         } else {
124                                 c = getwc(f);
125                         }
126                         if (c!=*p) {
127                                 ungetwc(c, f);
128                                 if (c<0) goto input_fail;
129                                 goto match_fail;
130                         }
131                         pos++;
132                         continue;
133                 }
134
135                 p++;
136                 if (*p=='*') {
137                         dest = 0; p++;
138                 } else if (iswdigit(*p) && p[1]=='$') {
139                         dest = arg_n(ap, *p-'0'); p+=2;
140                 } else {
141                         dest = va_arg(ap, void *);
142                 }
143
144                 for (width=0; iswdigit(*p); p++) {
145                         width = 10*width + *p - '0';
146                 }
147
148                 if (*p=='m') {
149                         wcs = 0;
150                         s = 0;
151                         alloc = !!dest;
152                         p++;
153                 } else {
154                         alloc = 0;
155                 }
156
157                 size = SIZE_def;
158                 switch (*p++) {
159                 case 'h':
160                         if (*p == 'h') p++, size = SIZE_hh;
161                         else size = SIZE_h;
162                         break;
163                 case 'l':
164                         if (*p == 'l') p++, size = SIZE_ll;
165                         else size = SIZE_l;
166                         break;
167                 case 'j':
168                         size = SIZE_ll;
169                         break;
170                 case 'z':
171                 case 't':
172                         size = SIZE_l;
173                         break;
174                 case 'L':
175                         size = SIZE_L;
176                         break;
177                 case 'd': case 'i': case 'o': case 'u': case 'x':
178                 case 'a': case 'e': case 'f': case 'g':
179                 case 'A': case 'E': case 'F': case 'G': case 'X':
180                 case 's': case 'c': case '[':
181                 case 'S': case 'C':
182                 case 'p': case 'n':
183                         p--;
184                         break;
185                 default:
186                         goto fmt_fail;
187                 }
188
189                 t = *p;
190
191                 /* Transform S,C -> ls,lc */
192                 if ((t&0x2f)==3) {
193                         size = SIZE_l;
194                         t |= 32;
195                 }
196
197                 if (t != 'n') {
198                         if (t != '[' && (t|32) != 'c')
199                                 while (iswspace((c=getwc(f)))) pos++;
200                         else
201                                 c=getwc(f);
202                         if (c < 0) goto input_fail;
203                         ungetwc(c, f);
204                 }
205
206                 switch (t) {
207                 case 'n':
208                         store_int(dest, size, pos);
209                         /* do not increment match count, etc! */
210                         continue;
211
212                 case 's':
213                 case 'c':
214                 case '[':
215                         if (t == 'c') {
216                                 if (width<1) width = 1;
217                                 invert = 1;
218                                 set = L"";
219                         } else if (t == 's') {
220                                 invert = 1;
221                                 static const wchar_t spaces[] = {
222                                         ' ', '\t', '\n', '\r', 11, 12,  0x0085,
223                                         0x2000, 0x2001, 0x2002, 0x2003, 0x2004, 0x2005,
224                                         0x2006, 0x2008, 0x2009, 0x200a,
225                                         0x2028, 0x2029, 0x205f, 0x3000, 0 };
226                                 set = spaces;
227                         } else {
228                                 if (*++p == '^') p++, invert = 1;
229                                 else invert = 0;
230                                 set = p;
231                                 if (*p==']') p++;
232                                 while (*p!=']') {
233                                         if (!*p) goto fmt_fail;
234                                         p++;
235                                 }
236                         }
237
238                         s = (size == SIZE_def) ? dest : 0;
239                         wcs = (size == SIZE_l) ? dest : 0;
240
241                         int gotmatch = 0;
242
243                         if (width < 1) width = -1;
244
245                         i = 0;
246                         if (alloc) {
247                                 k = t=='c' ? width+1U : 31;
248                                 if (size == SIZE_l) {
249                                         wcs = malloc(k*sizeof(wchar_t));
250                                         if (!wcs) goto alloc_fail;
251                                 } else {
252                                         s = malloc(k);
253                                         if (!s) goto alloc_fail;
254                                 }
255                         }
256                         while (width) {
257                                 if ((c=getwc(f))<0) break;
258                                 if (in_set(set, c) == invert)
259                                         break;
260                                 if (wcs) {
261                                         wcs[i++] = c;
262                                         if (alloc && i==k) {
263                                                 k += k+1;
264                                                 wchar_t *tmp = realloc(wcs, k*sizeof(wchar_t));
265                                                 if (!tmp) goto alloc_fail;
266                                                 wcs = tmp;
267                                         }
268                                 } else if (size != SIZE_l) {
269                                         int l = wctomb(s?s+i:tmp, c);
270                                         if (l<0) goto input_fail;
271                                         i += l;
272                                         if (alloc && i > k-4) {
273                                                 k += k+1;
274                                                 char *tmp = realloc(s, k);
275                                                 if (!tmp) goto alloc_fail;
276                                                 s = tmp;
277                                         }
278                                 }
279                                 pos++;
280                                 width-=(width>0);
281                                 gotmatch=1;
282                         }
283                         if (width) {
284                                 ungetwc(c, f);
285                                 if (t == 'c' || !gotmatch) goto match_fail;
286                         }
287
288                         if (alloc) {
289                                 if (size == SIZE_l) *(wchar_t **)dest = wcs;
290                                 else *(char **)dest = s;
291                         }
292                         if (t != 'c') {
293                                 if (wcs) wcs[i] = 0;
294                                 if (s) s[i] = 0;
295                         }
296                         break;
297
298                 case 'd': case 'i': case 'o': case 'u': case 'x':
299                 case 'a': case 'e': case 'f': case 'g':
300                 case 'A': case 'E': case 'F': case 'G': case 'X':
301                 case 'p':
302                         if (width < 1) width = 0;
303                         snprintf(tmp, sizeof tmp, "%.*s%.0d%s%c%%lln",
304                                 1+!dest, "%*", width, size_pfx[size+2], t);
305                         cnt = 0;
306                         if (fscanf(f, tmp, dest?dest:&cnt, &cnt) == -1)
307                                 goto input_fail;
308                         else if (!cnt)
309                                 goto match_fail;
310                         pos += cnt;
311                         break;
312                 default:
313                         goto fmt_fail;
314                 }
315
316                 if (dest) matches++;
317         }
318         if (0) {
319 fmt_fail:
320 alloc_fail:
321 input_fail:
322                 if (!matches) matches--;
323 match_fail:
324                 if (alloc) {
325                         free(s);
326                         free(wcs);
327                 }
328         }
329         FUNLOCK(f);
330         return matches;
331 }
332
333 weak_alias(vfwscanf,__isoc99_vfwscanf);