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4680 | right-hear | 1 | #include |
2 | #include |
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3 | #include |
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4 | #include |
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5 | #include |
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6 | |||
7 | #define __expect(foo,bar) (foo) |
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8 | #define __likely(foo) __expect((foo),1) |
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9 | #define __unlikely(foo) __expect((foo),0) |
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10 | |||
11 | unsigned long long int strtoull(const char *ptr, char **endptr, int base) |
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12 | { |
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13 | int neg = 0, overflow = 0; |
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14 | long long int v=0; |
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15 | const char* orig; |
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16 | const char* nptr=ptr; |
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17 | |||
18 | while(isspace(*nptr)) ++nptr; |
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19 | |||
20 | if (*nptr == '-') { neg=1; nptr++; } |
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21 | else if (*nptr == '+') ++nptr; |
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22 | orig=nptr; |
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23 | if (base==16 && nptr[0]=='0') goto skip0x; |
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24 | if (base) { |
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25 | register unsigned int b=base-2; |
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26 | if (__unlikely(b>34)) { errno=EINVAL; return 0; } |
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27 | } else { |
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28 | if (*nptr=='0') { |
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29 | base=8; |
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30 | skip0x: |
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31 | if (((*(nptr+1)=='x')||(*(nptr+1)=='X')) && isxdigit(nptr[2])) { |
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32 | nptr+=2; |
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33 | base=16; |
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34 | } |
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35 | } else |
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36 | base=10; |
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37 | } |
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38 | while(__likely(*nptr)) { |
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39 | register unsigned char c=*nptr; |
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40 | c=(c>='a'?c-'a'+10:c>='A'?c-'A'+10:c<='9'?c-'0':0xff); |
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41 | if (__unlikely(c>=base)) break; /* out of base */ |
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42 | { |
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43 | register unsigned long x=(v&0xff)*base+c; |
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44 | register unsigned long long w=(v>>8)*base+(x>>8); |
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45 | if (w>(ULLONG_MAX>>8)) overflow=1; |
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46 | v=(w<<8)+(x&0xff); |
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47 | } |
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48 | ++nptr; |
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49 | } |
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50 | if (__unlikely(nptr==orig)) { /* no conversion done */ |
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51 | nptr=ptr; |
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52 | errno=EINVAL; |
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53 | v=0; |
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54 | } |
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55 | if (endptr) *endptr=(char *)nptr; |
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56 | if (overflow) { |
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57 | errno=ERANGE; |
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58 | return ULLONG_MAX; |
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59 | } |
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60 | return (neg?-v:v); |
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61 | } |
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62 | |||
63 | /* die, BSD, die!!! */ |
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64 | unsigned long long int strtouq(const char *nptr, char **endptr, int base) |
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65 | __attribute__((alias("strtoull"))); |
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66 | |||
67 | uintmax_t strtoumax(const char *nptr, char **endptr, int base) |
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68 | __attribute__((alias("strtoull")));8)+(x&0xff); |