[398] | 1 | #include <stdlib.h>
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| 2 | #include <stdarg.h>
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| 3 | #include <ctype.h>
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| 4 | #include <wchar.h>
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| 5 | #include <wctype.h>
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| 6 | #include <limits.h>
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| 7 | #include <string.h>
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| 8 | #include <stdint.h>
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| 9 |
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| 10 | #include "stdio_impl.h"
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| 11 | #include "shgetc.h"
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| 12 | #include "intscan.h"
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| 13 | #include "floatscan.h"
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| 14 |
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| 15 | #define SIZE_hh -2
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| 16 | #define SIZE_h -1
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| 17 | #define SIZE_def 0
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| 18 | #define SIZE_l 1
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| 19 | #define SIZE_L 2
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| 20 | #define SIZE_ll 3
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| 21 |
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| 22 | static void store_int(void *dest, int size, unsigned long long i)
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| 23 | {
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| 24 | if (!dest) return;
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| 25 | switch (size) {
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| 26 | case SIZE_hh:
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| 27 | *(char *)dest = i;
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| 28 | break;
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| 29 | case SIZE_h:
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| 30 | *(short *)dest = i;
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| 31 | break;
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| 32 | case SIZE_def:
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| 33 | *(int *)dest = i;
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| 34 | break;
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| 35 | case SIZE_l:
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| 36 | *(long *)dest = i;
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| 37 | break;
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| 38 | case SIZE_ll:
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| 39 | *(long long *)dest = i;
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| 40 | break;
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| 41 | }
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| 42 | }
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| 43 |
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| 44 | static void *arg_n(va_list ap, unsigned int n)
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| 45 | {
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| 46 | void *p;
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| 47 | unsigned int i;
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| 48 | va_list ap2;
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| 49 | va_copy(ap2, ap);
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| 50 | for (i=n; i>1; i--) va_arg(ap2, void *);
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| 51 | p = va_arg(ap2, void *);
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| 52 | va_end(ap2);
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| 53 | return p;
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| 54 | }
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| 55 |
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| 56 | int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
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| 57 | {
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| 58 | int width;
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| 59 | int size;
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| 60 | int alloc;
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| 61 | int base;
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| 62 | const unsigned char *p;
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| 63 | int c, t;
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| 64 | char *s;
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| 65 | wchar_t *wcs;
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| 66 | mbstate_t st;
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| 67 | void *dest=NULL;
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| 68 | int invert;
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| 69 | int matches=0;
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| 70 | unsigned long long x;
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| 71 | long double y;
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| 72 | off_t pos = 0;
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| 73 | unsigned char scanset[257];
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| 74 | size_t i, k;
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| 75 | wchar_t wc;
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| 76 |
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| 77 | FLOCK(f);
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| 78 |
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| 79 | for (p=(const unsigned char *)fmt; *p; p++) {
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| 80 |
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| 81 | alloc = 0;
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| 82 |
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| 83 | if (isspace(*p)) {
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| 84 | while (isspace(p[1])) p++;
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| 85 | shlim(f, 0);
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| 86 | while (isspace(shgetc(f)));
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| 87 | shunget(f);
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| 88 | pos += shcnt(f);
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| 89 | continue;
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| 90 | }
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| 91 | if (*p != '%' || p[1] == '%') {
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| 92 | shlim(f, 0);
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| 93 | if (*p == '%') {
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| 94 | p++;
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| 95 | while (isspace((c=shgetc(f))));
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| 96 | } else {
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| 97 | c = shgetc(f);
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| 98 | }
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| 99 | if (c!=*p) {
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| 100 | shunget(f);
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| 101 | if (c<0) goto input_fail;
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| 102 | goto match_fail;
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| 103 | }
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| 104 | pos += shcnt(f);
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| 105 | continue;
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| 106 | }
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| 107 |
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| 108 | p++;
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| 109 | if (*p=='*') {
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| 110 | dest = 0; p++;
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| 111 | } else if (isdigit(*p) && p[1]=='$') {
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| 112 | dest = arg_n(ap, *p-'0'); p+=2;
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| 113 | } else {
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| 114 | dest = va_arg(ap, void *);
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| 115 | }
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| 116 |
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| 117 | for (width=0; isdigit(*p); p++) {
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| 118 | width = 10*width + *p - '0';
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| 119 | }
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| 120 |
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| 121 | if (*p=='m') {
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| 122 | wcs = 0;
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| 123 | s = 0;
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| 124 | alloc = !!dest;
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| 125 | p++;
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| 126 | } else {
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| 127 | alloc = 0;
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| 128 | }
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| 129 |
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| 130 | size = SIZE_def;
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| 131 | switch (*p++) {
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| 132 | case 'h':
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| 133 | if (*p == 'h') p++, size = SIZE_hh;
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| 134 | else size = SIZE_h;
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| 135 | break;
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| 136 | case 'l':
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| 137 | if (*p == 'l') p++, size = SIZE_ll;
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| 138 | else size = SIZE_l;
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| 139 | break;
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| 140 | case 'j':
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| 141 | size = SIZE_ll;
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| 142 | break;
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| 143 | case 'z':
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| 144 | case 't':
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| 145 | size = SIZE_l;
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| 146 | break;
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| 147 | case 'L':
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| 148 | size = SIZE_L;
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| 149 | break;
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| 150 | case 'd': case 'i': case 'o': case 'u': case 'x':
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| 151 | case 'a': case 'e': case 'f': case 'g':
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| 152 | case 'A': case 'E': case 'F': case 'G': case 'X':
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| 153 | case 's': case 'c': case '[':
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| 154 | case 'S': case 'C':
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| 155 | case 'p': case 'n':
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| 156 | p--;
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| 157 | break;
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| 158 | default:
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| 159 | goto fmt_fail;
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| 160 | }
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| 161 |
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| 162 | t = *p;
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| 163 |
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| 164 | /* C or S */
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| 165 | if ((t&0x2f) == 3) {
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| 166 | t |= 32;
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| 167 | size = SIZE_l;
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| 168 | }
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| 169 |
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| 170 | switch (t) {
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| 171 | case 'c':
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| 172 | if (width < 1) width = 1;
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| 173 | case '[':
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| 174 | break;
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| 175 | case 'n':
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| 176 | store_int(dest, size, pos);
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| 177 | /* do not increment match count, etc! */
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| 178 | continue;
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| 179 | default:
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| 180 | shlim(f, 0);
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| 181 | while (isspace(shgetc(f)));
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| 182 | shunget(f);
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| 183 | pos += shcnt(f);
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| 184 | }
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| 185 |
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| 186 | shlim(f, width);
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| 187 | if (shgetc(f) < 0) goto input_fail;
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| 188 | shunget(f);
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| 189 |
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| 190 | switch (t) {
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| 191 | case 's':
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| 192 | case 'c':
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| 193 | case '[':
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| 194 | if (t == 'c' || t == 's') {
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| 195 | memset(scanset, -1, sizeof scanset);
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| 196 | scanset[0] = 0;
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| 197 | if (t == 's') {
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| 198 | scanset[1+'\t'] = 0;
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| 199 | scanset[1+'\n'] = 0;
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| 200 | scanset[1+'\v'] = 0;
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| 201 | scanset[1+'\f'] = 0;
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| 202 | scanset[1+'\r'] = 0;
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| 203 | scanset[1+' '] = 0;
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| 204 | }
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| 205 | } else {
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| 206 | if (*++p == '^') p++, invert = 1;
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| 207 | else invert = 0;
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| 208 | memset(scanset, invert, sizeof scanset);
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| 209 | scanset[0] = 0;
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| 210 | if (*p == '-') p++, scanset[1+'-'] = 1-invert;
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| 211 | else if (*p == ']') p++, scanset[1+']'] = 1-invert;
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| 212 | for (; *p != ']'; p++) {
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| 213 | if (!*p) goto fmt_fail;
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| 214 | if (*p=='-' && p[1] && p[1] != ']')
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| 215 | for (c=p++[-1]; c<*p; c++)
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| 216 | scanset[1+c] = 1-invert;
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| 217 | scanset[1+*p] = 1-invert;
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| 218 | }
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| 219 | }
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| 220 | wcs = 0;
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| 221 | s = 0;
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| 222 | i = 0;
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| 223 | k = t=='c' ? width+1U : 31;
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| 224 | if (size == SIZE_l) {
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| 225 | if (alloc) {
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| 226 | wcs = malloc(k*sizeof(wchar_t));
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| 227 | if (!wcs) goto alloc_fail;
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| 228 | } else {
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| 229 | wcs = dest;
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| 230 | }
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| 231 | st = (mbstate_t){0};
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| 232 | while (scanset[(c=shgetc(f))+1]) {
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| 233 | switch (mbrtowc(&wc, &(char){c}, 1, &st)) {
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| 234 | case -1:
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| 235 | goto input_fail;
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| 236 | case -2:
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| 237 | continue;
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| 238 | }
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| 239 | if (wcs) wcs[i++] = wc;
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| 240 | if (alloc && i==k) {
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| 241 | k+=k+1;
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| 242 | wchar_t *tmp = realloc(wcs, k*sizeof(wchar_t));
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| 243 | if (!tmp) goto alloc_fail;
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| 244 | wcs = tmp;
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| 245 | }
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| 246 | }
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| 247 | if (!mbsinit(&st)) goto input_fail;
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| 248 | } else if (alloc) {
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| 249 | s = malloc(k);
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| 250 | if (!s) goto alloc_fail;
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| 251 | while (scanset[(c=shgetc(f))+1]) {
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| 252 | s[i++] = c;
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| 253 | if (i==k) {
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| 254 | k+=k+1;
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| 255 | char *tmp = realloc(s, k);
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| 256 | if (!tmp) goto alloc_fail;
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| 257 | s = tmp;
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| 258 | }
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| 259 | }
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| 260 | } else if ((s = dest)) {
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| 261 | while (scanset[(c=shgetc(f))+1])
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| 262 | s[i++] = c;
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| 263 | } else {
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| 264 | while (scanset[(c=shgetc(f))+1]);
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| 265 | }
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| 266 | shunget(f);
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| 267 | if (!shcnt(f)) goto match_fail;
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| 268 | if (t == 'c' && shcnt(f) != width) goto match_fail;
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| 269 | if (alloc) {
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| 270 | if (size == SIZE_l) *(wchar_t **)dest = wcs;
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| 271 | else *(char **)dest = s;
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| 272 | }
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| 273 | if (t != 'c') {
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| 274 | if (wcs) wcs[i] = 0;
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| 275 | if (s) s[i] = 0;
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| 276 | }
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| 277 | break;
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| 278 | case 'p':
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| 279 | case 'X':
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| 280 | case 'x':
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| 281 | base = 16;
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| 282 | goto int_common;
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| 283 | case 'o':
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| 284 | base = 8;
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| 285 | goto int_common;
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| 286 | case 'd':
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| 287 | case 'u':
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| 288 | base = 10;
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| 289 | goto int_common;
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| 290 | case 'i':
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| 291 | base = 0;
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| 292 | int_common:
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| 293 | x = __intscan(f, base, 0, ULLONG_MAX);
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| 294 | if (!shcnt(f)) goto match_fail;
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| 295 | if (t=='p' && dest) *(void **)dest = (void *)(uintptr_t)x;
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| 296 | else store_int(dest, size, x);
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| 297 | break;
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| 298 | case 'a': case 'A':
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| 299 | case 'e': case 'E':
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| 300 | case 'f': case 'F':
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| 301 | case 'g': case 'G':
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| 302 | y = __floatscan(f, size, 0);
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| 303 | if (!shcnt(f)) goto match_fail;
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| 304 | if (dest) switch (size) {
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| 305 | case SIZE_def:
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| 306 | *(float *)dest = y;
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| 307 | break;
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| 308 | case SIZE_l:
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| 309 | *(double *)dest = y;
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| 310 | break;
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| 311 | case SIZE_L:
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| 312 | *(long double *)dest = y;
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| 313 | break;
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| 314 | }
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| 315 | break;
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| 316 | }
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| 317 |
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| 318 | pos += shcnt(f);
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| 319 | if (dest) matches++;
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| 320 | }
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| 321 | if (0) {
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| 322 | fmt_fail:
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| 323 | alloc_fail:
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| 324 | input_fail:
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| 325 | if (!matches) matches--;
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| 326 | match_fail:
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| 327 | if (alloc) {
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| 328 | free(s);
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| 329 | free(wcs);
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| 330 | }
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| 331 | }
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| 332 | FUNLOCK(f);
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| 333 | return matches;
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| 334 | }
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| 335 |
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| 336 | weak_alias(vfscanf,__isoc99_vfscanf);
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