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#ifndef lint
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static const char RCSid[] = "$Id: portio.c,v 2.18 2016/03/15 13:57:09 greg Exp $";
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#endif
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/*
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* Portable i/o for binary files
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*
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* External symbols declared in rtio.h
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*/
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#include "copyright.h"
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#include "rtio.h"
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#include <math.h>
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void
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putstr( /* write null-terminated string to fp */
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char *s,
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FILE *fp
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)
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{
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do
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putc(*s, fp);
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while (*s++);
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}
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void
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putint( /* write a siz-byte integer to fp */
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long i,
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int siz,
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FILE *fp
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)
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{
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siz <<= 3;
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while ((siz -= 8) >= 0)
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putc((int)(i>>siz & 0xff), fp);
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}
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void
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putflt( /* put out floating point number */
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double f,
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FILE *fp
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)
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{
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long m;
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int e;
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m = frexp(f, &e) * 0x7fffffff;
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if (e > 127) { /* overflow */
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m = m > 0 ? (long)0x7fffffff : -(long)0x7fffffff;
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e = 127;
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} else if (e < -128) { /* underflow */
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m = 0;
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e = 0;
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}
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putint(m, 4, fp);
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putint((long)e, 1, fp);
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}
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int
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putbinary( /* fwrite() replacement for small objects */
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const void *p,
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int elsiz,
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int nel,
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FILE *fp)
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{
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const char *s = (const char *)p;
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int nbytes = elsiz*nel;
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if (nbytes > 512)
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return(fwrite(p, elsiz, nel, fp));
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while (nbytes-- > 0)
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putc(*s++, fp);
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return(nel);
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}
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char *
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getstr( /* get null-terminated string */
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char *s,
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FILE *fp
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)
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{
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char *cp;
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int c;
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cp = s;
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while ((c = getc(fp)) != EOF)
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if ((*cp++ = c) == '\0')
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return(s);
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return(NULL);
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}
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long
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getint( /* get a siz-byte integer */
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int siz,
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FILE *fp
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)
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{
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int c;
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long r;
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if ((c = getc(fp)) == EOF)
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return(EOF);
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r = 0x80&c ? -1<<8|c : c; /* sign extend */
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while (--siz > 0) {
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if ((c = getc(fp)) == EOF)
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return(EOF);
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r <<= 8;
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r |= c;
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}
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return(r);
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}
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double
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getflt( /* get a floating point number */
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FILE *fp
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)
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{
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long l;
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double d;
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l = getint(4, fp);
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if (l == EOF && feof(fp)) /* EOF? */
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return((double)EOF);
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if (l == 0) {
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getc(fp); /* exactly zero -- ignore exponent */
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return(0.0);
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}
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d = (l + (l > 0 ? .5 : -.5)) * (1./0x7fffffff);
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return(ldexp(d, (int)getint(1, fp)));
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}
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int
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getbinary( /* fread() replacement for small objects */
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void *p,
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int elsiz,
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int nel,
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FILE *fp)
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{
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char *s = (char *)p;
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int nbytes = elsiz*nel;
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int c;
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if (nbytes > 512)
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return(fread(p, elsiz, nel, fp));
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while (nbytes-- > 0) {
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if ((c = getc(fp)) == EOF)
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return((elsiz*nel - nbytes)/elsiz);
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*s++ = c;
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}
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return(nel);
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}
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