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
 106         FLOCK(f);
 107
 108         for (p=fmt; *p; p++) {
 109
 110                 if (iswspace(*p)) {
 111                         while (iswspace(p[1])) p++;
 112                         while (iswspace((c=getwc(f)))) pos++;
 113                         ungetwc(c, f);
 114                         continue;
 115                 }
 116                 if (*p != '%' || p[1] == '%') {
 117                         p += *p=='%';
 118                         c = getwc(f);
 119                         if (c!=*p) {
 120                                 ungetwc(c, f);
 121                                 if (c<0) goto input_fail;
 122                                 goto match_fail;
 123                         }
 124                         pos++;
 125                         continue;
 126                 }
 127
 128                 p++;
 129                 if (*p=='*') {
 130                         dest = 0; p++;
 131                 } else if (iswdigit(*p) && p[1]=='$') {
 132                         dest = arg_n(ap, *p-'0'); p+=2;
 133                 } else {
 134                         dest = va_arg(ap, void *);
 135                 }
 136
 137                 for (width=0; iswdigit(*p); p++) {
 138                         width = 10*width + *p - '0';
 139                 }
 140
 141                 if (*p=='m') {
 142                         alloc = 1;
 143                         p++;
 144                 } else {
 145                         alloc = 0;
 146                 }
 147
 148                 size = SIZE_def;
 149                 switch (*p++) {
 150                 case 'h':
 151                         if (*p == 'h') p++, size = SIZE_hh;
 152                         else size = SIZE_h;
 153                         break;
 154                 case 'l':
 155                         if (*p == 'l') p++, size = SIZE_ll;
 156                         else size = SIZE_l;
 157                         break;
 158                 case 'j':
 159                         size = SIZE_ll;
 160                         break;
 161                 case 'z':
 162                 case 't':
 163                         size = SIZE_l;
 164                         break;
 165                 case 'L':
 166                         size = SIZE_L;
 167                         break;
 168                 case 'd': case 'i': case 'o': case 'u': case 'x':
 169                 case 'a': case 'e': case 'f': case 'g':
 170                 case 'A': case 'E': case 'F': case 'G': case 'X':
 171                 case 's': case 'c': case '[':
 172                 case 'S': case 'C':
 173                 case 'p': case 'n':
 174                         p--;
 175                         break;
 176                 default:
 177                         goto fmt_fail;
 178                 }
 179
 180                 t = *p;
 181
 182                 /* Transform ls,lc -> S,C */
 183                 if (size==SIZE_l && (t&15)==3) t&=~32;
 184
 185                 if (t != 'n') {
 186                         if (t != '[' && (t|32) != 'c')
 187                                 while (iswspace((c=getwc(f)))) pos++;
 188                         else
 189                                 c=getwc(f);
 190                         if (c < 0) goto input_fail;
 191                         ungetwc(c, f);
 192                 }
 193
 194                 switch (t) {
 195                 case 'n':
 196                         store_int(dest, size, pos);
 197                         /* do not increment match count, etc! */
 198                         continue;
 199
 200                 case 'c':
 201                         if (width < 1) width = 1;
 202                         s = dest;
 203                         for (; width && (c=getwc(f)) >= 0; width--) {
 204                                 int l = wctomb(s?s:tmp, c);
 205                                 if (l<0) goto input_fail;
 206                                 if (s) s+=l;
 207                                 pos++;
 208                         }
 209                         if (width) goto match_fail;
 210                         break;
 211
 212                 case 'C':
 213                         if (width < 1) width = 1;
 214                         wcs = dest;
 215                         for (; width && (c=getwc(f)) >= 0; width--)
 216                                 pos++, wcs && (*wcs++ = c);
 217                         if (width) goto match_fail;
 218                         break;
 219
 220                 case 's':
 221                         if (width < 1) width = -1;
 222                         s = dest;
 223                         while (width && !iswspace(c=getwc(f)) && c!=EOF) {
 224                                 int l = wctomb(s?s:tmp, c);
 225                                 if (l<0) goto input_fail;
 226                                 if (s) s+=l;
 227                                 pos++;
 228                                 width-=(width>0);
 229                         }
 230                         if (width) ungetwc(c, f);
 231                         if (s) *s = 0;
 232                         break;
 233
 234                 case 'S':
 235                         wcs = dest;
 236                         if (width < 1) width = -1;
 237                         while (width && !iswspace(c=getwc(f)) && c!=EOF)
 238                                 width-=(width>0), pos++, *wcs++ = c;
 239                         if (width) ungetwc(c, f);
 240                         if (wcs) *wcs = 0;
 241                         break;
 242
 243                 case '[':
 244                         s = (size == SIZE_def) ? dest : 0;
 245                         wcs = (size == SIZE_l) ? dest : 0;
 246
 247                         if (*++p == '^') p++, invert = 1;
 248                         else invert = 0;
 249
 250                         int gotmatch = 0;
 251
 252                         if (width < 1) width = -1;
 253
 254                         while (width) {
 255                                 if ((c=getwc(f))<0) break;
 256                                 if (in_set(p, c) == invert)
 257                                         break;
 258                                 if (wcs) {
 259                                         *wcs++ = c;
 260                                 } else if (size != SIZE_l) {
 261                                         int l = wctomb(s?s:tmp, c);
 262                                         if (l<0) goto input_fail;
 263                                         if (s) s+=l;
 264                                 }
 265                                 pos++;
 266                                 width-=(width>0);
 267                                 gotmatch=1;
 268                         }
 269                         if (width) ungetwc(c, f);
 270
 271                         if (!gotmatch) goto match_fail;
 272
 273                         if (*p==']') p++;
 274                         while (*p!=']') {
 275                                 if (!*p) goto fmt_fail;
 276                                 p++;
 277                         }
 278
 279                         if (wcs) *wcs++ = 0;
 280                         if (s) *s++ = 0;
 281                         break;
 282
 283                 case 'd': case 'i': case 'o': case 'u': case 'x':
 284                 case 'a': case 'e': case 'f': case 'g':
 285                 case 'A': case 'E': case 'F': case 'G': case 'X':
 286                 case 'p':
 287                         if (width < 1) width = 0;
 288                         snprintf(tmp, sizeof tmp, "%.*s%.0d%s%c%%lln",
 289                                 1+!dest, "%*", width, size_pfx[size+2], t);
 290                         cnt = 0;
 291                         if (fscanf(f, tmp, dest?dest:&cnt, &cnt) == -1)
 292                                 goto input_fail;
 293                         else if (!cnt)
 294                                 goto match_fail;
 295                         pos += cnt;
 296                         break;
 297                 default:
 298                         goto fmt_fail;
 299                 }
 300
 301                 if (dest) matches++;
 302         }
 303         if (0) {
 304 fmt_fail:
 305 input_fail:
 306                 if (!matches) matches--;
 307         }
 308 match_fail:
 309         FUNLOCK(f);
 310         return matches;
 311 }
 312
 313 weak_alias(vfwscanf,__isoc99_vfwscanf);