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);