261 lines
5.3 KiB
HTML
261 lines
5.3 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of FGETC</TITLE>
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</HEAD><BODY>
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<H1>FGETC</H1>
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Section: Linux Programmer's Manual (3)<BR>Updated: 2017-09-15<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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fgetc, fgets, getc, getchar, ungetc - input of characters and strings
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<PRE>
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<B>#include <<A HREF="file:///usr/include/stdio.h">stdio.h</A>></B>
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<B>int fgetc(FILE *</B><I>stream</I><B>);</B>
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<B>char *fgets(char *</B><I>s</I><B>, int </B><I>size</I><B>, FILE *</B><I>stream</I><B>);</B>
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<B>int getc(FILE *</B><I>stream</I><B>);</B>
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<B>int getchar(void);</B>
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<B>int ungetc(int </B><I>c</I><B>, FILE *</B><I>stream</I><B>);</B>
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</PRE>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>fgetc</B>()
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reads the next character from
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<I>stream</I>
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and returns it as an
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<I>unsigned char</I>
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cast to an
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<I>int</I>,
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or
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<B>EOF</B>
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on end of file or error.
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<P>
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<B>getc</B>()
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is equivalent to
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<B>fgetc</B>()
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except that it may be implemented as a macro which evaluates
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<I>stream</I>
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more than once.
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<P>
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<B>getchar</B>()
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is equivalent to
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<B>getc(</B><I>stdin</I><B>)</B><I></I>.
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<P>
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<B>fgets</B>()
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reads in at most one less than
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<I>size</I>
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characters from
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<I>stream</I>
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and stores them into the buffer pointed to by
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<I>s</I>.
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Reading stops after an
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<B>EOF</B>
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or a newline.
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If a newline is read, it is stored into the buffer.
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A terminating null byte ('\0')
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is stored after the last character in the buffer.
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<P>
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<B>ungetc</B>()
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pushes
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<I>c</I>
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back to
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<I>stream</I>,
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cast to
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<I>unsigned char</I>,
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where it is available for subsequent read operations.
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Pushed-back characters
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will be returned in reverse order; only one pushback is guaranteed.
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<P>
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Calls to the functions described here can be mixed with each other and with
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calls to other input functions from the
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<I>stdio</I>
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library for the same input stream.
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<P>
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For nonlocking counterparts, see
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<B><A HREF="/cgi-bin/man/man2html?3+unlocked_stdio">unlocked_stdio</A></B>(3).
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<A NAME="lbAE"> </A>
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<H2>RETURN VALUE</H2>
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<B>fgetc</B>(),
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<B>getc</B>()
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and
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<B>getchar</B>()
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return the character read as an
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<I>unsigned char</I>
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cast to an
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<I>int</I>
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or
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<B>EOF</B>
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on end of file or error.
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<P>
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<B>fgets</B>()
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returns
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<I>s</I>
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on success, and NULL
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on error or when end of file occurs while no characters have been read.
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<P>
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<B>ungetc</B>()
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returns
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<I>c</I>
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on success, or
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<B>EOF</B>
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on error.
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<A NAME="lbAF"> </A>
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<H2>ATTRIBUTES</H2>
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For an explanation of the terms used in this section, see
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<B><A HREF="/cgi-bin/man/man2html?7+attributes">attributes</A></B>(7).
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<TABLE BORDER>
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<TR VALIGN=top><TD><B>Interface</B></TD><TD><B>Attribute</B></TD><TD><B>Value</B><BR></TD></TR>
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<TR VALIGN=top><TD>
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<B>fgetc</B>(),
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<B>fgets</B>(),
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<B>getc</B>(),
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<BR>
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<B>getchar</B>(),
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<B>ungetc</B>()
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</TD><TD>Thread safety</TD><TD>MT-Safe<BR></TD></TR>
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</TABLE>
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<P>
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<A NAME="lbAG"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, C89, C99.
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<P>
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It is not advisable to mix calls to input functions from the
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<I>stdio</I>
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library with low-level calls to
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<B><A HREF="/cgi-bin/man/man2html?2+read">read</A></B>(2)
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for the file descriptor associated with the input stream; the results
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will be undefined and very probably not what you want.
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<A NAME="lbAH"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+read">read</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+write">write</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?3+ferror">ferror</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+fgetwc">fgetwc</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+fgetws">fgetws</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+fopen">fopen</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+fread">fread</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+fseek">fseek</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+getline">getline</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+gets">gets</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+getwchar">getwchar</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+puts">puts</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+scanf">scanf</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+ungetwc">ungetwc</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?3+unlocked_stdio">unlocked_stdio</A></B>(3),
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<B><A HREF="/cgi-bin/man/man2html?7+feature_test_macros">feature_test_macros</A></B>(7)
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<A NAME="lbAI"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">RETURN VALUE</A><DD>
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<DT id="5"><A HREF="#lbAF">ATTRIBUTES</A><DD>
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<DT id="6"><A HREF="#lbAG">CONFORMING TO</A><DD>
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<DT id="7"><A HREF="#lbAH">SEE ALSO</A><DD>
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<DT id="8"><A HREF="#lbAI">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:42 GMT, March 31, 2021
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