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