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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4973 | right-hear | 1 | /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */ |
| 2 | #include |
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| 3 | #include |
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| 4 | #include |
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| 5 | |||
| 6 | double |
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| 7 | strtod(const char *s, char **sret) |
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| 8 | { |
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| 9 | long double r; /* result */ |
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| 10 | int e; /* exponent */ |
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| 11 | long double d; /* scale */ |
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| 12 | int sign; /* +- 1.0 */ |
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| 13 | int esign; |
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| 14 | int i; |
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| 15 | int flags=0; |
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| 16 | |||
| 17 | r = 0.0; |
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| 18 | sign = 1.0; |
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| 19 | e = 0; |
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| 20 | esign = 1; |
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| 21 | |||
| 22 | while ((*s == ' ') || (*s == '\t')) |
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| 23 | s++; |
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| 24 | |||
| 25 | if (*s == '+') |
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| 26 | s++; |
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| 27 | else if (*s == '-') |
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| 28 | { |
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| 29 | sign = -1; |
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| 30 | s++; |
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| 31 | } |
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| 32 | |||
| 33 | while ((*s >= '0') && (*s <= '9')) |
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| 34 | { |
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| 35 | flags |= 1; |
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| 36 | r *= 10.0; |
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| 37 | r += *s - '0'; |
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| 38 | s++; |
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| 39 | } |
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| 40 | |||
| 41 | if (*s == '.') |
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| 42 | { |
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| 43 | d = 0.1L; |
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| 44 | s++; |
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| 45 | while ((*s >= '0') && (*s <= '9')) |
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| 46 | { |
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| 47 | flags |= 2; |
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| 48 | r += d * (*s - '0'); |
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| 49 | s++; |
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| 50 | d *= 0.1L; |
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| 51 | } |
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| 52 | } |
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| 53 | |||
| 54 | if (flags == 0) |
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| 55 | { |
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| 56 | if (sret) |
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| 57 | *sret = unconst(s, char *); |
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| 58 | return 0; |
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| 59 | } |
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| 60 | |||
| 61 | if ((*s == 'e') || (*s == 'E')) |
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| 62 | { |
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| 63 | s++; |
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| 64 | if (*s == '+') |
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| 65 | s++; |
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| 66 | else if (*s == '-') |
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| 67 | { |
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| 68 | s++; |
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| 69 | esign = -1; |
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| 70 | } |
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| 71 | if ((*s < '0') || (*s > '9')) |
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| 72 | { |
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| 73 | if (sret) |
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| 74 | *sret = unconst(s, char *); |
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| 75 | return r; |
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| 76 | } |
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| 77 | |||
| 78 | while ((*s >= '0') && (*s <= '9')) |
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| 79 | { |
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| 80 | e *= 10; |
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| 81 | e += *s - '0'; |
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| 82 | s++; |
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| 83 | } |
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| 84 | } |
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| 85 | |||
| 86 | if (esign < 0) |
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| 87 | for (i = 1; i <= e; i++) |
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| 88 | r *= 0.1L; |
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| 89 | else |
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| 90 | for (i = 1; i <= e; i++) |
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| 91 | r *= 10.0; |
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| 92 | |||
| 93 | if (sret) |
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| 94 | *sret = unconst(s, char *); |
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| 95 | return r * sign; |
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| 96 | } |