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45 lines
643 B
C
45 lines
643 B
C
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/*
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Copyright 1983
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Alcyon Corporation
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8716 Production Ave.
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San Diego, CA 92121
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@(#) getchar.c - Sep 12, 1983 REGULUS 4.1
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*/
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/* v6 getchar routine */
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#define BSIZE 512
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struct iob {
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int fd; /* file descriptor */
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int cc; /* char count */
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char *cp; /* ptr to next character */
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char cbuf[BSIZE]; /* char buffer */
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} fin;
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getchar()
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{
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char c;
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register int i;
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if (fin.fd == 0) {
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if (read(0,&c,1) <= 0 || c==4)
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return(0);
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i = c;
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return(i & 0xff);
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}
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if (fin.cc <= 0) {
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fin.cp = &(fin.cbuf[0]);
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fin.cc = read(fin.fd,fin.cp,BSIZE);
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}
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if (fin.cc <= 0)
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return(0);
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fin.cc--;
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i = *(fin.cp)++;
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return(i & 0xff);
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}
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