_tracef, _tracedump, _traceattr, _traceattr2, _nc_tracebits, _tracecchar_t, _tracecchar_t2, _tracechar, _tracechtype, _tracechtype2, _tracemouse, trace − curses debugging routines
_tracef(const char *format, ...);
void _tracedump(const char *label, WINDOW *win);
char *_traceattr(attr_t attr);
char *_traceattr2(int buffer, chtype ch);
char * _tracecchar_t(const cchar_t *string);
char * _tracecchar_t2(int buffer, const cchar_t *string);
char *_tracechar(int ch);
char *_tracechtype(chtype ch);
char *_tracechtype2(int buffer, chtype ch);
char *_tracemouse(const MEVENT *event);
void trace(const unsigned int param);
The trace routines are used for debugging the ncurses libraries, as well as applications which use the ncurses libraries. These functions are normally available only with the debugging library libncurses_g.a, but may be compiled into any model (shared, static, profile) by defining the symbol TRACE. Additionally, some functions are only available with the wide-character configuration of the libraries.
The principal parts of this interface are the trace routine which selectively enables different tracing features, and the _tracef routine which writes formatted data to the trace file.
trace with a nonzero parameter opens the file
trace in the current directory for output. The
parameter is formed by OR’ing values from the list of
TRACE_xxx definitions in
<curses.h>. These include:
turn off tracing.
trace user and system times of updates.
trace tputs calls.
trace update actions, old & new screens.
trace cursor movement and scrolling.
trace all character outputs.
trace all update actions. The old and new screen contents are written to the trace file for each refresh.
trace all curses calls. The parameters for each call are traced, as well as return values.
trace virtual character puts, i.e., calls to addch.
trace low-level input processing, including timeouts.
trace state of TTY control bits.
trace internal/nested calls.
trace per-character calls.
trace read/write of terminfo/termcap data.
trace changes to video attributes and colors.
maximum trace level, enables all of the separate trace features.
Some tracing features are enabled whenever the trace parameter is nonzero. Some features overlap. The specific names are used as a guideline.
These functions check the NCURSES_TRACE environment variable, to set the tracing feature as if trace was called:
filter, initscr, new_prescr, newterm, nofilter, ripoffline, setupterm, slk_init, tgetent
Routines which return a value are designed to be used as parameters to the _tracef routine.
These functions are not part of the XSI interface. Some other curses implementations are known to have similar, undocumented features, but they are not compatible with ncurses.
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