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| 1 | +/*********************************************************** |
| 2 | +Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
| 3 | +The Netherlands. |
| 4 | +
|
| 5 | + All Rights Reserved |
| 6 | +
|
| 7 | +Permission to use, copy, modify, and distribute this software and its |
| 8 | +documentation for any purpose and without fee is hereby granted, |
| 9 | +provided that the above copyright notice appear in all copies and that |
| 10 | +both that copyright notice and this permission notice appear in |
| 11 | +supporting documentation, and that the names of Stichting Mathematisch |
| 12 | +Centrum or CWI not be used in advertising or publicity pertaining to |
| 13 | +distribution of the software without specific, written prior permission. |
| 14 | +
|
| 15 | +STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO |
| 16 | +THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| 17 | +FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE |
| 18 | +FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
| 19 | +WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
| 20 | +ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT |
| 21 | +OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
| 22 | +
|
| 23 | +******************************************************************/ |
| 24 | + |
| 25 | +/* Just in case you haven't got an atof() around... |
| 26 | + This one doesn't check for bad syntax or overflow, |
| 27 | + and is slow and inaccurate. |
| 28 | + But it's good enough for the occasional string literal... */ |
| 29 | + |
| 30 | +#ifdef HAVE_CONFIG_H |
| 31 | +#include "config.h" |
| 32 | +#endif |
| 33 | + |
| 34 | +#include <ctype.h> |
| 35 | + |
| 36 | +double atof(s) |
| 37 | + char *s; |
| 38 | +{ |
| 39 | + double a = 0.0; |
| 40 | + int e = 0; |
| 41 | + int c; |
| 42 | + while ((c = *s++) != '\0' && isdigit(c)) { |
| 43 | + a = a*10.0 + (c - '0'); |
| 44 | + } |
| 45 | + if (c == '.') { |
| 46 | + while ((c = *s++) != '\0' && isdigit(c)) { |
| 47 | + a = a*10.0 + (c - '0'); |
| 48 | + e = e-1; |
| 49 | + } |
| 50 | + } |
| 51 | + if (c == 'e' || c == 'E') { |
| 52 | + int sign = 1; |
| 53 | + int i = 0; |
| 54 | + c = *s++; |
| 55 | + if (c == '+') |
| 56 | + c = *s++; |
| 57 | + else if (c == '-') { |
| 58 | + c = *s++; |
| 59 | + sign = -1; |
| 60 | + } |
| 61 | + while (isdigit(c)) { |
| 62 | + i = i*10 + (c - '0'); |
| 63 | + c = *s++; |
| 64 | + } |
| 65 | + e += i*sign; |
| 66 | + } |
| 67 | + while (e > 0) { |
| 68 | + a *= 10.0; |
| 69 | + e--; |
| 70 | + } |
| 71 | + while (e < 0) { |
| 72 | + a *= 0.1; |
| 73 | + e++; |
| 74 | + } |
| 75 | + return a; |
| 76 | +} |
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