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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 standard.h |
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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 <stdio.h> |
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#include "rtio.h" |
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#include <math.h> |
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#ifdef getc_unlocked /* avoid horrendous overhead of flockfile */ |
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#undef getc |
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#undef putc |
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#define getc getc_unlocked |
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#define putc putc_unlocked |
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#endif |
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void |
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putstr(s, fp) /* write null-terminated string to fp */ |
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register char *s; |
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register FILE *fp; |
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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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void |
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putint(i, siz, fp) /* write a siz-byte integer to fp */ |
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long i; |
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register int siz; |
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register FILE *fp; |
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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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while (siz--) |
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putc((int)(i>>(siz<<3) & 0xff), fp); |
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while (siz > sizeof(long)) { |
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putc((i<0)*0xff, fp); |
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siz--; |
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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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putc((int)(i & 0xff), fp); |
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} |
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void |
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putflt(f, fp) /* put out floating point number */ |
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double f; |
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FILE *fp; |
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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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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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putint(e, 1, fp); |
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} |
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|
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size_t |
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putbinary( /* fwrite() replacement for small objects */ |
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const void *p, |
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size_t elsiz, |
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size_t 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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size_t nbytes = elsiz*nel; |
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|
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if (nbytes > 128) |
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return(fwrite(p, elsiz, nel, fp)); |
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|
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while (nbytes-- > 0) |
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if (putc(*s++, fp) == EOF) |
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return((elsiz*nel - nbytes)/elsiz); |
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|
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return(nel); |
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} |
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|
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|
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char * |
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getstr(s, fp) /* get null-terminated string */ |
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char *s; |
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register FILE *fp; |
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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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register char *cp; |
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register int c; |
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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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long |
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getint(siz, fp) /* get a siz-byte integer */ |
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int siz; |
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register FILE *fp; |
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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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register int c; |
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register long r; |
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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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r = c; |
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if (c & 0x80) /* sign extend? */ |
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r |= ~255L; |
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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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|
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double |
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getflt(fp) /* get a floating point number */ |
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FILE *fp; |
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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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|
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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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|
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|
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size_t |
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getbinary( /* fread() replacement for small objects */ |
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void *p, |
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size_t elsiz, |
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size_t nel, |
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FILE *fp) |
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{ |
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char *s = (char *)p; |
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size_t nbytes = elsiz*nel; |
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int c; |
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|
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if (nbytes > 128) |
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return(fread(p, elsiz, nel, fp)); |
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|
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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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} |