81 lines
1.2 KiB
C
81 lines
1.2 KiB
C
/* $Id$ */
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/*
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* (c) copyright 1983 by the Vrije Universiteit, Amsterdam, The Netherlands.
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*
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* This product is part of the Amsterdam Compiler Kit.
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*
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* Permission to use, sell, duplicate or disclose this software must be
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* obtained in writing. Requests for such permissions may be sent to
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*
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* Dr. Andrew S. Tanenbaum
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* Wiskundig Seminarium
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* Vrije Universiteit
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* Postbox 7161
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* 1007 MC Amsterdam
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* The Netherlands
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*
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*/
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/* Author: J.W. Stevenson */
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#include "pc.h"
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void _skipsp(struct file* f)
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{
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while ((*f->ptr == ' ') || (*f->ptr == '\t'))
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_incpt(f);
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}
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int _getsig(struct file* f)
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{
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int sign;
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if ((sign = (*f->ptr == '-')) || *f->ptr == '+')
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_incpt(f);
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return (sign);
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}
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int _fstdig(struct file* f)
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{
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int ch;
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ch = *f->ptr - '0';
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if ((unsigned)ch > 9)
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{
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_trp(EDIGIT);
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ch = 0;
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}
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return (ch);
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}
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int _nxtdig(struct file* f)
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{
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int ch;
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_incpt(f);
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ch = *f->ptr - '0';
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if ((unsigned)ch > 9)
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return (-1);
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return (ch);
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}
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int _getint(struct file* f)
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{
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int is_signed, i, ch;
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is_signed = _getsig(f);
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ch = _fstdig(f);
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i = 0;
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do
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i = i * 10 - ch;
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while ((ch = _nxtdig(f)) >= 0);
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return (is_signed ? i : -i);
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}
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int _rdi(struct file* f)
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{
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_rf(f);
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_skipsp(f);
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return (_getint(f));
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}
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