As is common in Vim, there are a bunch of ways!
Note that the first two solutions depend on an absence of blank lines.
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If your cursor is on the line with the function name, try d}. It will delete everything to the next block (i.e. your function body).
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Within the function body itself, dap will delete the ‘paragraph’.
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You can delete a curly brace block with da}. (If you like this syntax, I recommend Tim Pope’s fantastic surround.vim, which adds more features with a similar feel).
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You could also try using regular expressions to delete until the next far left-indented closing curly brace: d/^}Enter
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]] and [[ move to the next/previous first-column curly brace (equivalent to using
/and?with that regex I mentioned above. Combine with the d motion, and you acheive the same effect. In addons like Python-mode, these operators are redefined to mean exactly what you’re looking for: move from function to function.
How to delete the whole block, header included
If you’re on the header/name, or the line before the block, da} should do the trick.
If you’re below a block, you can also make use of the handy ‘offset’ feature of a Vim search. d?^{?-1 will delete backwards to one line before the first occurrence of a first-column opening curly brace. This command’s a bit tricky to type. Maybe you could make a <leader> shortcut out of it.
Plugins
I don’t do much C programming in Vim, but there are surely plugins to help with such a thing. Try Vim Scripts or their mirror at GitHub.