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