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config: add write_int
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parent
19c51c644e
commit
0a9d3638ee
@ -29,6 +29,35 @@ impl fmt::Display for Error {
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}
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}
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struct FmtWrapper<'a> {
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buf: &'a mut [u8],
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offset: usize,
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}
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impl<'a> FmtWrapper<'a> {
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fn new(buf: &'a mut [u8]) -> Self {
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FmtWrapper {
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buf: buf,
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offset: 0,
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}
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}
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fn contents(&self) -> &[u8] {
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&self.buf[..self.offset]
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}
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}
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impl<'a> fmt::Write for FmtWrapper<'a> {
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fn write_str(&mut self, s: &str) -> fmt::Result {
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let bytes = s.as_bytes();
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let remainder = &mut self.buf[self.offset..];
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let remainder = &mut remainder[..bytes.len()];
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remainder.copy_from_slice(bytes);
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self.offset += bytes.len();
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Ok(())
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}
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}
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#[cfg(has_spiflash)]
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mod imp {
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use core::str;
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@ -36,6 +65,8 @@ mod imp {
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use cache;
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use spiflash;
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use super::Error;
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use core::fmt::Write;
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use super::FmtWrapper;
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// One flash sector immediately before the firmware.
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const ADDR: usize = ::mem::FLASH_BOOT_ADDRESS - spiflash::SECTOR_SIZE;
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@ -224,6 +255,13 @@ mod imp {
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}
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}
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pub fn write_int(key: &str, value: u32) -> Result<(), Error> {
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let mut buf = [0; 16];
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let mut wrapper = FmtWrapper::new(&mut buf);
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write!(&mut wrapper, "{}", value).unwrap();
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write(key, wrapper.contents())
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}
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pub fn remove(key: &str) -> Result<(), Error> {
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write(key, &[])
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}
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