55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/**
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*
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* This header file defines the information used by the standard I/O
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* package.
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*
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**/
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#define _BUFSIZ 512 /* standard buffer size */
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#define _NFILE 16 /* maximum number of files */
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struct _iobuf
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{
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char *_ptr; /* current buffer pointer */
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int _cnt; /* current byte count */
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char *_base; /* base address of I/O buffer */
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char _flag; /* control flags */
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char _file; /* file number */
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};
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extern struct _iobuf _iob[_NFILE];
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#define _IOREAD 1 /* read flag */
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#define _IOWRT 2 /* write flag */
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#define _IONBF 4 /* non-buffered flag */
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#define _IOMYBUF 8
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#define _IOEOF 16 /* end-of-file flag */
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#define _IOERR 32 /* error flag */
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#define _IOSTRG 64
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#define _IORW 128
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#define NULL 0 /* null pointer value */
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#define FILE struct _iobuf /* shorthand */
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#define EOF (-1) /* end-of-file code */
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#define stdin (&_iob[0]) /* standard input file pointer */
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#define stdout (&_iob[1]) /* standard output file pointer */
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#define stderr (&_iob[2]) /* standard error file pointer */
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#define getc(p) (--(p)->_cnt>=0? *(p)->_ptr++&255:_filbf(p))
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#define getchar() getc(stdin)
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#define putc(c,p) (--(p)->_cnt>=0? ((int)(*(p)->_ptr++=(c))):_flsbf((c),p))
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#define putchar(c) putc(c,stdout)
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#define feof(p) (((p)->_flag&_IOEOF)!=0)
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#define ferror(p) (((p)->_flag&_IOERR)!=0)
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#define fileno(p) (p)->_file
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#define rewind(fp) fseek(fp,0L,0)
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#define fflush(fp) _flsbf(-1,fp)
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FILE *fopen();
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FILE *freopen();
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long ftell();
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char *fgets();
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#define abs(x) ((x)<0?-(x):(x))
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#define max(a,b) ((a)>(b)?(a):(b))
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#define min(a,b) ((a)<=(b)?(a):(b)) |