GETS(P) POSIX Programmer's Manual GETS(P)
gets - get a string from a stdin stream
char *gets(char *s);
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().
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.
Refer to fgetc() .
The following sections are informative.
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 func-
tion is discouraged. The length of the string read is unlimited. It is possible to over-
flow this buffer in such a way as to cause applications to fail, or possible system secu-
It is recommended that the fgets() function should be used to read input lines.
feof() , ferror() , fgets() , the Base Definitions volume of IEEE Std 1003.1-2001,
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 GETS(P)