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

    NAME

    gets - get a string from a stdin stream
     
    

    SYNOPSIS

    #include <stdio.h>

    char *gets(char *s);
     

    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.

    The gets() function shall read bytes from the standard input stream, stdin, into the array pointed to by s, until a <newline> is read or an end-of-file condition is encountered. Any <newline> shall be discarded and a null byte shall be placed immediately after the last byte read into the array.

    The gets() 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(), fread(), getc(), getchar(), gets(), fscanf(), or scanf() using stream that returns data not supplied by a prior call to ungetc().  

    RETURN VALUE

    Upon successful completion, gets() shall return s. If the stream is at end-of-file, the end-of-file indicator for the stream shall be set and gets() shall return a null pointer. If a read error occurs, the error indicator for the stream shall be set, gets() shall return a null pointer,  and set errno to indicate the error.  

    ERRORS

    Refer to fgetc() .

    The following sections are informative.  

    EXAMPLES

    None.  

    APPLICATION USAGE

    Reading a line that overflows the array pointed to by s results in undefined behavior. The use of fgets() is recommended.

    Since the user cannot specify the length of the buffer passed to gets(), use of this function is discouraged. The length of the string read is unlimited. It is possible to overflow this buffer in such a way as to cause applications to fail, or possible system security violations.

    It is recommended that the fgets() function should be used to read input lines.  

    RATIONALE

    None.  

    FUTURE DIRECTIONS

    None.  

    SEE ALSO

    feof() , ferror() , fgets() , 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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