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53 lines
822 B
C
53 lines
822 B
C
#define BLEN 512
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#include <klib.h>
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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 char*/
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char cbuf[BLEN]; /*char buffer*/
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};
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fopen(fname,ibuf,x)
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char *fname;
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register struct iob *ibuf;
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int x;
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{
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ibuf->cc = 0; /*no chars*/
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x = (x == 0) ? 0 : 1;
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return(ibuf->fd=open(fname,0,x));
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}
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getc(ibuf)
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register struct iob *ibuf;
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{
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if(ibuf->cc<=0) {
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ibuf->cp = &(ibuf->cbuf[0]);
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ibuf->cc = read(ibuf->fd,ibuf->cp,BLEN);
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}
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if(ibuf->cc <= 0) {
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return(-1);
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}
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ibuf->cc--;
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return((int)(*(ibuf->cp)++)&0xff);
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}
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getw(ibuf)
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register struct iob *ibuf;
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{
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register int j;
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register int i;
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if((j=getc(ibuf)) == -1)
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return(-1);
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i = (j&0377) << 8;
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if((j=getc(ibuf)) == -1)
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return(-1);
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i =| (j&0377);
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if(i&0100000)
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i =| 0xffff0000; /* make it negative */
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return(i);
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}
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