release/src/router/libncurses/doc/html/man/curs_termcap.3x.html

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  41 <H1 class="no-header">curs_termcap 3x</H1>
  42 <PRE>
  43 <STRONG><A HREF="curs_termcap.3x.html">curs_termcap(3x)</A></STRONG>                                       <STRONG><A HREF="curs_termcap.3x.html">curs_termcap(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2><a name="h2-NAME">NAME</a></H2><PRE>
  50        <STRONG>PC</STRONG>, <STRONG>UP</STRONG>, <STRONG>BC</STRONG>, <STRONG>ospeed</STRONG>, <STRONG>tgetent</STRONG>, <STRONG>tgetflag</STRONG>, <STRONG>tgetnum</STRONG>, <STRONG>tgetstr</STRONG>,
  51        <STRONG>tgoto</STRONG>, <STRONG>tputs</STRONG> - direct <STRONG>curses</STRONG> interface to the terminfo
  52        capability database
  53
  54
  55 </PRE>
  56 <H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
  57        <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>
  58        <STRONG>#include</STRONG> <STRONG>&lt;term.h&gt;</STRONG>
  59
  60        <STRONG>extern</STRONG> <STRONG>char</STRONG> <STRONG>PC;</STRONG>
  61        <STRONG>extern</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <STRONG>UP;</STRONG>
  62        <STRONG>extern</STRONG> <STRONG>char</STRONG> <STRONG>*</STRONG> <STRONG>BC;</STRONG>
  63        <STRONG>extern</STRONG> <STRONG>short</STRONG> <STRONG>ospeed;</STRONG>
  64
  65        <STRONG>int</STRONG> <STRONG>tgetent(char</STRONG> <STRONG>*bp,</STRONG> <STRONG>const</STRONG> <STRONG>char</STRONG> <STRONG>*name);</STRONG>
  66        <STRONG>int</STRONG> <STRONG>tgetflag(char</STRONG> <STRONG>*id);</STRONG>
  67        <STRONG>int</STRONG> <STRONG>tgetnum(char</STRONG> <STRONG>*id);</STRONG>
  68        <STRONG>char</STRONG> <STRONG>*tgetstr(char</STRONG> <STRONG>*id,</STRONG> <STRONG>char</STRONG> <STRONG>**area);</STRONG>
  69        <STRONG>char</STRONG> <STRONG>*tgoto(const</STRONG> <STRONG>char</STRONG> <STRONG>*cap,</STRONG> <STRONG>int</STRONG> <STRONG>col,</STRONG> <STRONG>int</STRONG> <STRONG>row);</STRONG>
  70        <STRONG>int</STRONG> <STRONG>tputs(const</STRONG> <STRONG>char</STRONG> <STRONG>*str,</STRONG> <STRONG>int</STRONG> <STRONG>affcnt,</STRONG> <STRONG>int</STRONG> <STRONG>(*putc)(int));</STRONG>
  71
  72
  73 </PRE>
  74 <H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  75        These  routines  are included as a conversion aid for pro-
  76        grams that use the <EM>termcap</EM> library.  Their parameters  are
  77        the  same and the routines are emulated using the <EM>terminfo</EM>
  78        database.  Thus, they can only be used to query the  capa-
  79        bilities  of  entries  for which a terminfo entry has been
  80        compiled.
  81
  82
  83 </PRE>
  84 <H3><a name="h3-INITIALIZATION">INITIALIZATION</a></H3><PRE>
  85        The <STRONG>tgetent</STRONG> routine loads the entry for <EM>name</EM>.  It returns:
  86
  87           1  on success,
  88
  89           0  if there is no such entry (or that it is  a  generic
  90              type,  having  too little information for curses ap-
  91              plications to run), and
  92
  93           -1 if the terminfo database could not be found.
  94
  95        This differs from the <EM>termcap</EM> library in two ways:
  96
  97           <STRONG>o</STRONG>   The emulation ignores the buffer pointer  <EM>bp</EM>.   The
  98               <EM>termcap</EM>  library would store a copy of the terminal
  99               description in the area referenced by this pointer.
 100               However,  ncurses  stores its terminal descriptions
 101               in compiled binary form,  which  is  not  the  same
 102               thing.
 103
 104           <STRONG>o</STRONG>   There is a difference in return codes.  The <EM>termcap</EM>
 105               library does not check if the terminal  description
 106               is  marked  with  the <EM>generic</EM> capability, or if the
 107               terminal description has cursor-addressing.
 108
 109
 110 </PRE>
 111 <H3><a name="h3-CAPABILITY-VALUES">CAPABILITY VALUES</a></H3><PRE>
 112        The <STRONG>tgetflag</STRONG> routine gets the boolean entry for <EM>id</EM>, or ze-
 113        ro if it is not available.
 114
 115        The  <STRONG>tgetnum</STRONG>  routine gets the numeric entry for <EM>id</EM>, or -1
 116        if it is not available.
 117
 118        The <STRONG>tgetstr</STRONG> routine returns the string entry  for  <EM>id</EM>,  or
 119        zero  if it is not available.  Use <STRONG>tputs</STRONG> to output the re-
 120        turned string.  The <EM>area</EM> parameter is used as follows:
 121
 122           <STRONG>o</STRONG>   It is assumed to be the address of a pointer  to  a
 123               buffer managed by the calling application.
 124
 125           <STRONG>o</STRONG>   However,  ncurses checks to ensure that <STRONG>area</STRONG> is not
 126               NULL, and also that the resulting buffer pointer is
 127               not  NULL.  If either check fails, the <EM>area</EM> parame-
 128               ter is ignored.
 129
 130           <STRONG>o</STRONG>   If the checks succeed, ncurses also copies the  re-
 131               turn  value  to  the buffer pointed to by <EM>area</EM>, and
 132               the <EM>area</EM> value will be updated to  point  past  the
 133               null ending this value.
 134
 135           <STRONG>o</STRONG>   The return value itself is an address in the termi-
 136               nal description which is loaded into memory.
 137
 138        Only the first two characters of the <STRONG>id</STRONG> parameter of <STRONG>tget-</STRONG>
 139        <STRONG>flag</STRONG>, <STRONG>tgetnum</STRONG> and <STRONG>tgetstr</STRONG> are compared in lookups.
 140
 141
 142 </PRE>
 143 <H3><a name="h3-FORMATTING-CAPABILITIES">FORMATTING CAPABILITIES</a></H3><PRE>
 144        The  <STRONG>tgoto</STRONG>  routine  instantiates  the parameters into the
 145        given capability.  The output from this routine is  to  be
 146        passed to <STRONG>tputs</STRONG>.
 147
 148        The  <STRONG>tputs</STRONG>  routine  is described on the <STRONG><A HREF="curs_terminfo.3x.html">curs_terminfo(3x)</A></STRONG>
 149        manual page.  It can retrieve capabilities by either term-
 150        cap or terminfo name.
 151
 152
 153 </PRE>
 154 <H3><a name="h3-GLOBAL-VARIABLES">GLOBAL VARIABLES</a></H3><PRE>
 155        The variables <STRONG>PC</STRONG>, <STRONG>UP</STRONG> and <STRONG>BC</STRONG> are set by <STRONG>tgetent</STRONG> to the ter-
 156        minfo   entry's   data   for   <STRONG>pad_char</STRONG>,   <STRONG>cursor_up</STRONG>   and
 157        <STRONG>backspace_if_not_bs</STRONG>,  respectively.   <STRONG>UP</STRONG>  is  not  used by
 158        ncurses.  <STRONG>PC</STRONG> is used in the <STRONG>tdelay_output</STRONG> function.  <STRONG>BC</STRONG> is
 159        used  in  the <STRONG>tgoto</STRONG> emulation.  The variable <STRONG>ospeed</STRONG> is set
 160        by ncurses in a system-specific coding to reflect the ter-
 161        minal speed.
 162
 163
 164 </PRE>
 165 <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
 166        Except where explicitly noted, routines that return an in-
 167        teger return <STRONG>ERR</STRONG> upon failure and <STRONG>OK</STRONG> (SVr4 only  specifies
 168        "an integer value other than <STRONG>ERR</STRONG>") upon successful comple-
 169        tion.
 170
 171        Routines that return pointers return <STRONG>NULL</STRONG> on error.
 172
 173
 174 </PRE>
 175 <H2><a name="h2-BUGS">BUGS</a></H2><PRE>
 176        If you call <STRONG>tgetstr</STRONG> to fetch <STRONG>ca</STRONG> or any other parameterized
 177        string,  be aware that it will be returned in terminfo no-
 178        tation, not the older and not-quite-compatible termcap no-
 179        tation.   This  will not cause problems if all you do with
 180        it is call <STRONG>tgoto</STRONG> or <STRONG>tparm</STRONG>,  which  both  expand  terminfo-
 181        style  strings  as terminfo.  (The <STRONG>tgoto</STRONG> function, if con-
 182        figured to support termcap, will check if  the  string  is
 183        indeed  terminfo-style  by  looking for "%p" parameters or
 184        "$&lt;..&gt;" delays, and invoke a termcap-style parser  if  the
 185        string does not appear to be terminfo).
 186
 187        Because  terminfo  conventions for representing padding in
 188        string capabilities differ  from  termcap's,  <STRONG>tputs("50");</STRONG>
 189        will  put  out a literal "50" rather than busy-waiting for
 190        50 milliseconds.  Cope with it.
 191
 192        Note that termcap has nothing analogous to terminfo's  <STRONG>sgr</STRONG>
 193        string.   One consequence of this is that termcap applica-
 194        tions assume me (terminfo <STRONG>sgr0</STRONG>) does not reset the  alter-
 195        nate  character  set.  This implementation checks for, and
 196        modifies the data shown to the termcap interface to accom-
 197        modate termcap's limitation in this respect.
 198
 199
 200 </PRE>
 201 <H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
 202        The  XSI  Curses  standard,  Issue 4 describes these func-
 203        tions.  However, they are marked TO BE WITHDRAWN  and  may
 204        be removed in future versions.
 205
 206        Neither  the  XSI  Curses  standard nor the SVr4 man pages
 207        documented the return values of <STRONG>tgetent</STRONG> correctly,  though
 208        all  three were in fact returned ever since SVr1.  In par-
 209        ticular, an omission in the XSI Curses  documentation  has
 210        been  misinterpreted  to  mean  that <STRONG>tgetent</STRONG> returns <STRONG>OK</STRONG> or
 211        <STRONG>ERR</STRONG>.  Because the purpose of these functions is to provide
 212        compatibility  with  the <EM>termcap</EM> library, that is a defect
 213        in XCurses, Issue 4, Version 2 rather than in ncurses.
 214
 215        External variables are provided  for  support  of  certain
 216        termcap  applications.  However, termcap applications' use
 217        of those variables is poorly documented, e.g., not distin-
 218        guishing  between  input  and output.  In particular, some
 219        applications are reported to declare and/or modify <STRONG>ospeed</STRONG>.
 220
 221        The comment that only the first two characters of  the  <STRONG>id</STRONG>
 222        parameter  are  used  escapes many application developers.
 223        The original  BSD  4.2  termcap  library  (and  historical
 224        relics thereof) did not require a trailing null NUL on the
 225        parameter name passed to <STRONG>tgetstr</STRONG>,  <STRONG>tgetnum</STRONG>  and  <STRONG>tgetflag</STRONG>.
 226        Some  applications  assume that the termcap interface does
 227        not require the trailing NUL for the parameter name.  Tak-
 228        ing into account these issues:
 229
 230        <STRONG>o</STRONG>   As  a special case, <STRONG>tgetflag</STRONG> matched against a single-
 231            character identifier provided that was at the  end  of
 232            the  terminal  description.   You should not rely upon
 233            this behavior in portable programs.  This  implementa-
 234            tion  disallows matches against single-character capa-
 235            bility names.
 236
 237        <STRONG>o</STRONG>   This implementation disallows matches by  the  termcap
 238            interface  against extended capability names which are
 239            longer than two characters.
 240
 241
 242 </PRE>
 243 <H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 244        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="terminfo.5.html">terminfo(5)</A></STRONG>, <STRONG><A HREF="term_variables.3x.html">term_variables(3x)</A></STRONG>, <STRONG>putc(3)</STRONG>.
 245
 246        http://invisible-island.net/ncurses/tctest.html
 247
 248
 249
 250                                                        <STRONG><A HREF="curs_termcap.3x.html">curs_termcap(3x)</A></STRONG>
 251 </PRE>
 252 <div class="nav">
 253 <ul>
 254 <li><a href="#h2-NAME">NAME</a></li>
 255 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 256 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
 257 <ul>
 258 <li><a href="#h3-INITIALIZATION">INITIALIZATION</a></li>
 259 <li><a href="#h3-CAPABILITY-VALUES">CAPABILITY VALUES</a></li>
 260 <li><a href="#h3-FORMATTING-CAPABILITIES">FORMATTING CAPABILITIES</a></li>
 261 <li><a href="#h3-GLOBAL-VARIABLES">GLOBAL VARIABLES</a></li>
 262 </ul>
 263 </li>
 264 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 265 <li><a href="#h2-BUGS">BUGS</a></li>
 266 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 267 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 268 </ul>
 269 </div>
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