1 #include <stdlib.h>
2 #include <stdarg.h>
3 #include <ctype.h>
4 #include <wchar.h>
5 #include <wctype.h>
6 #include <limits.h>
7 #include <string.h>
8 #include <stdint.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
store_int(void * dest,int size,unsigned long long i)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
arg_n(va_list ap,unsigned int n)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
vfscanf(FILE * restrict f,const char * restrict fmt,va_list ap)56 int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
57 {
58 int width;
59 int size;
60 int alloc;
61 int base;
62 const unsigned char *p;
63 int c, t;
64 char *s;
65 wchar_t *wcs;
66 mbstate_t st;
67 void *dest=NULL;
68 int invert;
69 int matches=0;
70 unsigned long long x;
71 long double y;
72 off_t pos = 0;
73 unsigned char scanset[257];
74 size_t i, k;
75 wchar_t wc;
76
77 FLOCK(f);
78
79 for (p=(const unsigned char *)fmt; *p; p++) {
80
81 alloc = 0;
82
83 if (isspace(*p)) {
84 while (isspace(p[1])) p++;
85 shlim(f, 0);
86 while (isspace(shgetc(f)));
87 shunget(f);
88 pos += shcnt(f);
89 continue;
90 }
91 if (*p != '%' || p[1] == '%') {
92 shlim(f, 0);
93 if (*p == '%') {
94 p++;
95 while (isspace((c=shgetc(f))));
96 } else {
97 c = shgetc(f);
98 }
99 if (c!=*p) {
100 shunget(f);
101 if (c<0) goto input_fail;
102 goto match_fail;
103 }
104 pos += shcnt(f);
105 continue;
106 }
107
108 p++;
109 if (*p=='*') {
110 dest = 0; p++;
111 } else if (isdigit(*p) && p[1]=='$') {
112 dest = arg_n(ap, *p-'0'); p+=2;
113 } else {
114 dest = va_arg(ap, void *);
115 }
116
117 for (width=0; isdigit(*p); p++) {
118 width = 10*width + *p - '0';
119 }
120
121 if (*p=='m') {
122 wcs = 0;
123 s = 0;
124 alloc = !!dest;
125 p++;
126 } else {
127 alloc = 0;
128 }
129
130 size = SIZE_def;
131 switch (*p++) {
132 case 'h':
133 if (*p == 'h') p++, size = SIZE_hh;
134 else size = SIZE_h;
135 break;
136 case 'l':
137 if (*p == 'l') p++, size = SIZE_ll;
138 else size = SIZE_l;
139 break;
140 case 'j':
141 size = SIZE_ll;
142 break;
143 case 'z':
144 case 't':
145 size = SIZE_l;
146 break;
147 case 'L':
148 size = SIZE_L;
149 break;
150 case 'd': case 'i': case 'o': case 'u': case 'x':
151 case 'a': case 'e': case 'f': case 'g':
152 case 'A': case 'E': case 'F': case 'G': case 'X':
153 case 's': case 'c': case '[':
154 case 'S': case 'C':
155 case 'p': case 'n':
156 p--;
157 break;
158 default:
159 goto fmt_fail;
160 }
161
162 t = *p;
163
164 /* C or S */
165 if ((t&0x2f) == 3) {
166 t |= 32;
167 size = SIZE_l;
168 }
169
170 switch (t) {
171 case 'c':
172 if (width < 1) width = 1;
173 case '[':
174 break;
175 case 'n':
176 store_int(dest, size, pos);
177 /* do not increment match count, etc! */
178 continue;
179 default:
180 shlim(f, 0);
181 while (isspace(shgetc(f)));
182 shunget(f);
183 pos += shcnt(f);
184 }
185
186 shlim(f, width);
187 if (shgetc(f) < 0) goto input_fail;
188 shunget(f);
189
190 switch (t) {
191 case 's':
192 case 'c':
193 case '[':
194 if (t == 'c' || t == 's') {
195 memset(scanset, -1, sizeof scanset);
196 scanset[0] = 0;
197 if (t == 's') {
198 scanset[1+'\t'] = 0;
199 scanset[1+'\n'] = 0;
200 scanset[1+'\v'] = 0;
201 scanset[1+'\f'] = 0;
202 scanset[1+'\r'] = 0;
203 scanset[1+' '] = 0;
204 }
205 } else {
206 if (*++p == '^') p++, invert = 1;
207 else invert = 0;
208 memset(scanset, invert, sizeof scanset);
209 scanset[0] = 0;
210 if (*p == '-') p++, scanset[1+'-'] = 1-invert;
211 else if (*p == ']') p++, scanset[1+']'] = 1-invert;
212 for (; *p != ']'; p++) {
213 if (!*p) goto fmt_fail;
214 if (*p=='-' && p[1] && p[1] != ']')
215 for (c=p++[-1]; c<*p; c++)
216 scanset[1+c] = 1-invert;
217 scanset[1+*p] = 1-invert;
218 }
219 }
220 wcs = 0;
221 s = 0;
222 i = 0;
223 k = t=='c' ? width+1U : 31;
224 if (size == SIZE_l) {
225 if (alloc) {
226 wcs = malloc(k*sizeof(wchar_t));
227 if (!wcs) goto alloc_fail;
228 } else {
229 wcs = dest;
230 }
231 st = (mbstate_t){0};
232 while (scanset[(c=shgetc(f))+1]) {
233 switch (mbrtowc(&wc, &(char){c}, 1, &st)) {
234 case -1:
235 goto input_fail;
236 case -2:
237 continue;
238 }
239 if (wcs) wcs[i++] = wc;
240 if (alloc && i==k) {
241 k+=k+1;
242 wchar_t *tmp = realloc(wcs, k*sizeof(wchar_t));
243 if (!tmp) goto alloc_fail;
244 wcs = tmp;
245 }
246 }
247 if (!mbsinit(&st)) goto input_fail;
248 } else if (alloc) {
249 s = malloc(k);
250 if (!s) goto alloc_fail;
251 while (scanset[(c=shgetc(f))+1]) {
252 s[i++] = c;
253 if (i==k) {
254 k+=k+1;
255 char *tmp = realloc(s, k);
256 if (!tmp) goto alloc_fail;
257 s = tmp;
258 }
259 }
260 } else if ((s = dest)) {
261 while (scanset[(c=shgetc(f))+1])
262 s[i++] = c;
263 } else {
264 while (scanset[(c=shgetc(f))+1]);
265 }
266 shunget(f);
267 if (!shcnt(f)) goto match_fail;
268 if (t == 'c' && shcnt(f) != width) goto match_fail;
269 if (alloc) {
270 if (size == SIZE_l) *(wchar_t **)dest = wcs;
271 else *(char **)dest = s;
272 }
273 if (t != 'c') {
274 if (wcs) wcs[i] = 0;
275 if (s) s[i] = 0;
276 }
277 break;
278 case 'p':
279 case 'X':
280 case 'x':
281 base = 16;
282 goto int_common;
283 case 'o':
284 base = 8;
285 goto int_common;
286 case 'd':
287 case 'u':
288 base = 10;
289 goto int_common;
290 case 'i':
291 base = 0;
292 int_common:
293 x = __intscan(f, base, 0, ULLONG_MAX);
294 if (!shcnt(f)) goto match_fail;
295 if (t=='p' && dest) *(void **)dest = (void *)(uintptr_t)x;
296 else store_int(dest, size, x);
297 break;
298 case 'a': case 'A':
299 case 'e': case 'E':
300 case 'f': case 'F':
301 case 'g': case 'G':
302 y = __floatscan(f, size, 0);
303 if (!shcnt(f)) goto match_fail;
304 if (dest) switch (size) {
305 case SIZE_def:
306 *(float *)dest = y;
307 break;
308 case SIZE_l:
309 *(double *)dest = y;
310 break;
311 case SIZE_L:
312 *(long double *)dest = y;
313 break;
314 }
315 break;
316 }
317
318 pos += shcnt(f);
319 if (dest) matches++;
320 }
321 if (0) {
322 fmt_fail:
323 alloc_fail:
324 input_fail:
325 if (!matches) matches--;
326 match_fail:
327 if (alloc) {
328 free(s);
329 free(wcs);
330 }
331 }
332 FUNLOCK(f);
333 return matches;
334 }
335
336 weak_alias(vfscanf,__isoc99_vfscanf);
337