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* The authors of this software are Rob Pike and Ken Thompson.
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* Copyright (c) 2002 by Lucent Technologies.
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* Permission to use, copy, modify, and distribute this software for any
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* purpose without fee is hereby granted, provided that this entire notice
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* is included in all copies of any software which is or includes a copy
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* or modification of this software and in all copies of the supporting
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* documentation for such software.
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE
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* ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
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* OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
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* Reads a floating-point number by interpreting successive characters
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* returned by (*f)(vp). The last call it makes to f terminates the
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* scan, so is not a character in the number. It may therefore be
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* necessary to back up the input stream up one byte after calling charstod.
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fmtcharstod(int(*f)(void*), void *vp)
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int neg, eneg, dig, exp, c;
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while(c == ' ' || c == '\t')
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if(c == '-' || c == '+'){
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while(c >= '0' && c <= '9'){
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while(c >= '0' && c <= '9'){
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if(c == 'e' || c == 'E'){
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if(c == '-' || c == '+'){
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while(c >= '0' && c <= '9'){
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dem = __fmtpow10(exp);