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50 lines
865 B
50 lines
865 B
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/* Just in case you haven't got an atof() around... |
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This one doesn't check for bad syntax or overflow, |
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and is slow and inaccurate. |
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But it's good enough for the occasional string literal... */ |
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#include "pyconfig.h" |
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#include <ctype.h> |
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double atof(char *s) |
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{ |
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double a = 0.0; |
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int e = 0; |
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int c; |
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while ((c = *s++) != '\0' && isdigit(c)) { |
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a = a*10.0 + (c - '0'); |
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} |
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if (c == '.') { |
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while ((c = *s++) != '\0' && isdigit(c)) { |
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a = a*10.0 + (c - '0'); |
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e = e-1; |
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} |
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} |
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if (c == 'e' || c == 'E') { |
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int sign = 1; |
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int i = 0; |
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c = *s++; |
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if (c == '+') |
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c = *s++; |
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else if (c == '-') { |
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c = *s++; |
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sign = -1; |
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} |
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while (isdigit(c)) { |
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i = i*10 + (c - '0'); |
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c = *s++; |
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} |
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e += i*sign; |
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} |
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while (e > 0) { |
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a *= 10.0; |
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e--; |
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} |
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while (e < 0) { |
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a *= 0.1; |
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e++; |
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} |
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return a; |
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}
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