E.1.7. - Miscellaneous macros
These macros provide some status information and allow you to break
the plot program out of a command file if that is appropriate.
| Name |
What it Does |
 |
|
|
is_bgnd() |
Nonzero if running in the background |
is_quiet() |
Nonzero if quiet mode is on (see zq) |
get_fun_num() |
Value is function number, as in f1, f2, f3 |
set_error() |
When function returns, plot program resets to command level |
|
The last macro sets a flag that makes the plot program behave just
as if the user typed
^C at the keyboard, but the action doesn't
occur until the user function returns control to the plot program.
For example, if the user function is reading a data file and has reached
the end of that file, you might have code such as,
user4() {
...
if (fgets(buf, 128, fd) == NULL) {
printf("Reached end of file.\n");
set_error();
return;
}
...
}
|
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