kc3-lang/libxkbcommon/src/xkbcomp

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• Hash : 5b5b67f2
  Author :
  Date : 2023-05-01T22:30:41
  

  Add support for modmap None (#291) Unlike current xkbcommon, X11’s xkbcomp allows to remove entries in the modifiers’ map using “modifier_map None { … }”. “None” is translated to the special value “XkbNoModifier” defined in “X11/extensions/XKB.h”. Then it relies on the fact that in "CopyModMapDef", the following code: 1U << entry->modifier ends up being zero when “entry->modifier” is “XkbNoModifier” (i.e. 0xFF). Indeed, it relies on the overflow behaviour of the left shift, which in practice resolves to use only the 5 low bits of the shift amount, i.e. 0x1F here. Then the result of “1U << 0xFF” is cast to “char”, i.e. 0. This is a good trick but too magical, so in libxkbcommon we will use an explicit test against our new constant XKB_MOD_NONE.

• Files

• action.c
• action.h
• ast-build.c
• ast-build.h
• ast.h
• compat.c
• expr.c
• expr.h
• include.c
• include.h
• keycodes.c
• keymap-dump.c
• keymap.c
• keywords.c
• keywords.gperf
• parser-priv.h
• parser.y
• rules.c
• rules.h
• scanner.c
• symbols.c
• types.c
• vmod.c
• vmod.h
• xkbcomp-priv.h
• xkbcomp.c

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