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Fix incorrect and nonstandard use of error() #8

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@nmlgc nmlgc commented Feb 17, 2024

The error() function is defined nowhere in this codebase. When linking against glibc, the declaration will match the nonstandard error(3) function, but midicomp only ever passes a single const char* to this function, which doesn't match its 3+-parameter signature. Consequently, this code fails to link with any other libc, and doesn't correctly show the respective errors even with glibc.

Using prs_error() fixes these issues, allows this code to be compiled with MinGW, and retains the line number in the now correct error output.

The `error()` function is defined nowhere in this codebase. When linking
against glibc, the declaration will match the nonstandard [error(3)]
function, but midicomp only ever passes a single `const char*` to this
function, which doesn't match its 3+-parameter signature. Consequently,
this code fails to link with any other libc, and doesn't correctly show
the respective errors even *with* glibc.

Using `prs_error()` fixes these issues, allows this code to be compiled
with MinGW, and retains the line number in the now correct error output.

[error(3)]: https://linux.die.net/man/3/error
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