From 7118692e506f9698a77c7cceea3b1dd47bb4b99a Mon Sep 17 00:00:00 2001 From: Thomas Voss Date: Thu, 13 Oct 2022 00:03:37 +0200 Subject: Move functions to their own files MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Also we move the source code to a src/ directory. We also move from using `struct luxdisp` to `lux_t` to signify that we don’t want the user to be messing with the struct members. --- src/luxset.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 src/luxset.c (limited to 'src/luxset.c') diff --git a/src/luxset.c b/src/luxset.c new file mode 100644 index 0000000..b707efd --- /dev/null +++ b/src/luxset.c @@ -0,0 +1,58 @@ +/* + * BSD Zero Clause License + * + * Copyright (c) 2022 Thomas Voss + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR + * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +#include +#include + +#include "common.h" +#include "lux.h" + +static int intlen(int); + +int +luxset(lux_t *disp, int n) +{ + /* The same deal as in luxget() */ + if (disp->__bstream == NULL) { + if ((disp->__bstream = getbstream(disp->__dirfd)) == NULL) + return -1; + } else + rewind(disp->__bstream); + + /* After writing the new brightness value to the brightness file, we + * need to truncate it so that luxset(disp, 1234); luxset(disp, 9); + * gives us a final brightness of 2 and not 9234. + */ + fprintf(disp->__bstream, "%d", n); + ftruncate(fileno(disp->__bstream), intlen(n)); + return n; +} + +int +intlen(int n) +{ + return n < 10 ? 1 + : n < 100 ? 2 + : n < 1000 ? 3 + : n < 10000 ? 4 + : n < 100000 ? 5 + : n < 1000000 ? 6 + : n < 10000000 ? 7 + : n < 100000000 ? 8 + : n < 1000000000 ? 9 + : 10; +} -- cgit v1.2.3