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fgetc (3)
  • fgetc (3) ( Solaris man: Библиотечные вызовы )
  • fgetc (3) ( FreeBSD man: Библиотечные вызовы )
  • fgetc (3) ( Русские man: Библиотечные вызовы )
  • fgetc (3) ( Linux man: Библиотечные вызовы )
  • >> fgetc (3) ( POSIX man: Библиотечные вызовы )
  •  

    NAME

    fgetc - get a byte from a stream
     
    

    SYNOPSIS

    #include <stdio.h>

    int fgetc(FILE *stream);
     

    DESCRIPTION

    The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to the ISO C standard.

    If the end-of-file indicator for the input stream pointed to by stream is not set and a next byte is present, the fgetc() function shall obtain the next byte as an unsigned char converted to an int, from the input stream pointed to by stream, and advance the associated file position indicator for the stream (if defined). Since fgetc() operates on bytes, reading a character consisting of multiple bytes (or "a multi-byte character") may require multiple calls to fgetc().

    The fgetc() function may mark the st_atime field of the file associated with stream for update. The st_atime field shall be marked for update by the first successful execution of fgetc(), fgets(), fgetwc(), fgetws(), fread(), fscanf(), getc(), getchar(), gets(), or scanf() using stream that returns data not supplied by a prior call to ungetc() or ungetwc().  

    RETURN VALUE

    Upon successful completion, fgetc() shall return the next byte from the input stream pointed to by stream. If the end-of-file indicator for the stream is set, or if the stream is at end-of-file, the end-of-file indicator for the stream shall be set and fgetc() shall return EOF. If a read error occurs, the error indicator for the stream shall be set, fgetc() shall return EOF,  and shall set errno to indicate the error.  

    ERRORS

    The fgetc() function shall fail if data needs to be read and:

    EAGAIN
    The O_NONBLOCK flag is set for the file descriptor underlying stream and the process would be delayed in the fgetc() operation.
    EBADF
    The file descriptor underlying stream is not a valid file descriptor open for reading.
    EINTR
    The read operation was terminated due to the receipt of a signal, and no data was transferred.
    EIO
    A physical I/O error has occurred, or the process is in a background process group attempting to read from its controlling terminal, and either the process is ignoring or blocking the SIGTTIN signal or the process group is orphaned. This error may also be generated for implementation-defined reasons.
    EOVERFLOW
    The file is a regular file and an attempt was made to read at or beyond the offset maximum associated with the corresponding stream.

    The fgetc() function may fail if:

    ENOMEM
    Insufficient storage space is available.
    ENXIO
    A request was made of a nonexistent device, or the request was outside the capabilities of the device.

    The following sections are informative.  

    EXAMPLES

    None.  

    APPLICATION USAGE

    If the integer value returned by fgetc() is stored into a variable of type char and then compared against the integer constant EOF, the comparison may never succeed, because sign-extension of a variable of type char on widening to integer is implementation-defined.

    The ferror() or feof() functions must be used to distinguish between an error condition and an end-of-file condition.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    feof() , ferror() , fopen() , getchar() , getc() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdio.h>  

    COPYRIGHT

    Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    EXAMPLES
    APPLICATION USAGE
    RATIONALE
    FUTURE DIRECTIONS
    SEE ALSO
    COPYRIGHT


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