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ircd::fs: Add truncate() suite.

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This commit is contained in:
Jason Volk 2018-08-23 21:24:19 -07:00
parent 888862ec56
commit 0ce45b50d6
2 changed files with 25 additions and 0 deletions
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4
include/ircd/fs/write.h
View file

@ -26,6 +26,10 @@ namespace ircd::fs
// Yields ircd::ctx to overwrite (trunc) file from buffer; returns view of written portion
const_buffer overwrite(const fd &, const const_buffer & = {}, const write_opts & = write_opts_default);
const_buffer overwrite(const string_view &path, const const_buffer & = {}, const write_opts & = write_opts_default);
// Truncate file to explicit size
void truncate(const fd &, const size_t &, const write_opts & = write_opts_default);
void truncate(const string_view &path, const size_t &, const write_opts & = write_opts_default);
}
/// Options for a write operation

21
ircd/fs.cc
View file

@ -383,6 +383,27 @@ ircd::fs::write_opts
const ircd::fs::write_opts_default
{};
void
ircd::fs::truncate(const string_view &path,
const size_t &size,
const write_opts &opts)
{
const fd fd
{
path, std::ios::out | std::ios::trunc
};
return truncate(fd, size, opts);
}
void
ircd::fs::truncate(const fd &fd,
const size_t &size,
const write_opts &opts)
{
syscall(::ftruncate, fd, size);
}
ircd::const_buffer
ircd::fs::overwrite(const string_view &path,
const const_buffer &buf,