plP_checkdriverinit: Checks to see if any of the specified drivers have been initialized

`plP_checkdriverinit`: Checks to see if any of the specified drivers have been initialized
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#### `plP_checkdriverinit`: Checks to see if any of the specified drivers have been initialized

`plP_checkdriverinit (` | list`)`;

Checks to see if any of the specified drivers have been initialized. Function tests a space-delimited list of driver names to see how many of the given drivers have been initialized, and how often. The return code of the function is: `0` if no matching drivers were found to have been initialized; `-1` if an error occurred allocating the internal buffer; or, a positive number indicating the number of streams encountered that belong to drivers on the provided list. This function invokes `plP_getinitdriverlist` internally to get a complete list of drivers that have been initialized in order to compare with the driver names specified in the argument list to `plP_checkdriverinit`.

`list` (`char *`, input)

  Pointer to character string specifying a space-delimited list of driver names, e.g., `"bmp jpeg tiff"`.

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Chapter 22. Internal C functions in PLplot | Home | `plP_getinitdriverlist`: Get the initialized-driver list