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2396
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* Just in case you haven't got an atof() around...
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26 This one doesn't check for bad syntax or overflow,
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27 and is slow and inaccurate.
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28 But it's good enough for the occasional string literal... */
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29
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30 #include "config.h"
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31
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32 #include <ctype.h>
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33
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34 double atof(s)
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35 char *s;
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36 {
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37 double a = 0.0;
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38 int e = 0;
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39 int c;
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40 while ((c = *s++) != '\0' && isdigit(c)) {
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41 a = a*10.0 + (c - '0');
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42 }
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43 if (c == '.') {
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44 while ((c = *s++) != '\0' && isdigit(c)) {
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45 a = a*10.0 + (c - '0');
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46 e = e-1;
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47 }
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48 }
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49 if (c == 'e' || c == 'E') {
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50 int sign = 1;
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51 int i = 0;
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52 c = *s++;
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53 if (c == '+')
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54 c = *s++;
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55 else if (c == '-') {
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56 c = *s++;
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57 sign = -1;
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58 }
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59 while (isdigit(c)) {
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60 i = i*10 + (c - '0');
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61 c = *s++;
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62 }
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63 e += i*sign;
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64 }
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65 while (e > 0) {
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66 a *= 10.0;
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67 e--;
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68 }
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69 while (e < 0) {
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70 a *= 0.1;
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71 e++;
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72 }
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73 return a;
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74 }
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