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103 lines
1.4 KiB
C
103 lines
1.4 KiB
C
/* Copyright (C) 1996 DJ Delorie, see COPYING.DJ for details */
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/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
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#include <precomp.h>
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/*
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* @implemented
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*/
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double
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strtod(const char *s, char **sret)
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{
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long double r; /* result */
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int e; /* exponent */
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long double d; /* scale */
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int sign; /* +- 1.0 */
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int esign;
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int i;
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int flags=0;
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r = 0.0;
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sign = 1;
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e = 0;
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esign = 1;
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if (s == NULL)
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return r;
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while ((*s == ' ') || (*s == '\t'))
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s++;
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if (*s == '+')
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s++;
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else if (*s == '-')
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{
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sign = -1;
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s++;
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}
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while ((*s >= '0') && (*s <= '9'))
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{
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flags |= 1;
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r *= 10.0;
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r += *s - '0';
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s++;
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}
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if (*s == '.')
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{
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d = 0.1L;
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s++;
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while ((*s >= '0') && (*s <= '9'))
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{
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flags |= 2;
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r += d * (*s - '0');
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s++;
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d *= 0.1L;
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}
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}
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if (flags == 0)
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{
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if (sret)
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*sret = (char *)s;
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return 0;
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}
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if ((*s == 'e') || (*s == 'E'))
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{
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s++;
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if (*s == '+')
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s++;
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else if (*s == '-')
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{
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s++;
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esign = -1;
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}
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if ((*s < '0') || (*s > '9'))
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{
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if (sret)
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*sret = (char *)s;
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return r;
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}
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while ((*s >= '0') && (*s <= '9'))
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{
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e *= 10;
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e += *s - '0';
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s++;
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}
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}
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if (esign < 0)
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for (i = 1; i <= e; i++)
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r *= 0.1L;
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else
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for (i = 1; i <= e; i++)
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r *= 10.0;
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if (sret)
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*sret = (char *)s;
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return r * sign;
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}
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