nsz Git - musl/blob - src/stdio/vfscanf.c

   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
  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 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);