[Tile-serving] [openstreetmap/osm2pgsql] Fix parsing problems in style file reader (PR #1592)

[Jochen Topf]

Some variables were not initialized correctly when parsing a style file,
which lead to some surprising behaviour with flags of one config line
re-used by the next if the flags field of that line was empty.

This could also have lead to buffer overflows in the first line being
parsed.

This commit also adds some more tests for the parsing code.

See #1590
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1592

-- Commit Summary --

  * Fix parsing problems in style file reader

-- File Changes --

    M src/taginfo.cpp (10)
    M tests/CMakeLists.txt (1)
    A tests/style/comments.style (3)
    A tests/style/data-types.style (4)
    A tests/style/empty.style (0)
    A tests/style/invalid-data-type.style (2)
    A tests/style/invalid-osm-type.style (2)
    A tests/style/missing.style (5)
    A tests/style/node.style (1)
    A tests/style/valid.style (12)
    A tests/style/way-area.style (3)
    A tests/test-output-pgsql-style-file.cpp (231)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1592.patch
https://github.com/openstreetmap/osm2pgsql/pull/1592.diff

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