STDIO(S)                 XENIX System V                  STDIO(S)



     Name
          stdio - Performs standard buffered input and output.

     Syntax
          #include <stdio.h>
          FILE *stdin, *stdout, *stderr;

     Description
          The stdio library contains an efficient, user-level I/O
          buffering scheme.  The in-line macros getc(S) and putc(S)
          handle characters quickly.  The macros getchar, putchar, and
          the higher-level routines fgetc, fgets, fprintf, fputc,
          fputs, fread, fscanf, fwrite, gets, getw, printf, puts,
          putw, and scanf all use getc and putc; they can be freely
          intermixed.

          A file with associated buffering is called a ``stream'' and
          is declared to be a pointer to a defined type FILE .
          fopen(S) creates certain descriptive data for a stream and
          returns a pointer to designate the stream in all further
          transactions.  Normally, there are three open streams with
          constant pointers declared in the ``include'' file and
          associated with the standard open files:

               stdin     Standard input file
               stdout    Standard output file
               stderr    Standard error file

          A constant ``pointer'' NULL designates the null stream.

          An integer constant EOF is returned upon end-of-file or
          error by most integer functions that deal with streams (see
          the individual descriptions for details).

          Any program that uses this package must include the header
          file of pertinent macro definitions, as follows:

               #include <stdio.h>

          Most of the functions and constants mentioned in this
          section of the manual are declared in that ``include'' file
          and are described elsewhere.  The constants and the
          following ``functions'' are implemented as macros
          (redeclaration of these names is perilous): getc, getchar,
          putc, putchar, feof, ferror, and fileno.










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     STDIO(S)                 XENIX System V                  STDIO(S)



     See Also
          open(S), close(S), read(S), write(S), ctermid(S),
          cuserid(S), fclose(S), ferror(S), fopen(S), fread(S),
          fseek(S), getc(S), gets(S), popen(S), printf(S), putc(S),
          puts(S), scanf(S), setbuf(S), system(S), tmpnam(S)

     Diagnostics
          Invalid stream pointers can cause grave disorder, possibly
          including program termination.  Individual function
          descriptions describe the possible error conditions.













































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