Initial code

This commit is contained in:
datalore 2025-05-30 11:13:50 +02:00
parent 7c84a06861
commit e2c0394b26
5 changed files with 210 additions and 0 deletions

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.gitignore vendored Normal file
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/.zig-cache
/zig-out

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build.zig Normal file
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const std = @import("std");
pub fn build(b: *std.Build) void {
const target = b.standardTargetOptions(.{});
const optimize = b.standardOptimizeOption(.{});
const exe = b.addExecutable(.{
.name = "powerbottom",
.root_source_file = b.path("src/main.zig"),
.target = target,
.optimize = optimize,
});
b.installArtifact(exe);
const run_cmd = b.addRunArtifact(exe);
run_cmd.step.dependOn(b.getInstallStep());
// This allows the user to pass arguments to the application in the build
// command itself, like this: `zig build run -- arg1 arg2 etc`
if (b.args) |args| {
run_cmd.addArgs(args);
}
// This creates a build step. It will be visible in the `zig build --help` menu,
// and can be selected like this: `zig build run`
// This will evaluate the `run` step rather than the default, which is "install".
const run_step = b.step("run", "Run the app");
run_step.dependOn(&run_cmd.step);
}

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build.zig.zon Normal file
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.{
// This is the default name used by packages depending on this one. For
// example, when a user runs `zig fetch --save <url>`, this field is used
// as the key in the `dependencies` table. Although the user can choose a
// different name, most users will stick with this provided value.
//
// It is redundant to include "zig" in this name because it is already
// within the Zig package namespace.
.name = "powerbottom",
// This is a [Semantic Version](https://semver.org/).
// In a future version of Zig it will be used for package deduplication.
.version = "0.0.0",
// This field is optional.
// This is currently advisory only; Zig does not yet do anything
// with this value.
//.minimum_zig_version = "0.11.0",
// This field is optional.
// Each dependency must either provide a `url` and `hash`, or a `path`.
// `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
// Once all dependencies are fetched, `zig build` no longer requires
// internet connectivity.
.dependencies = .{
// See `zig fetch --save <url>` for a command-line interface for adding dependencies.
//.example = .{
// // When updating this field to a new URL, be sure to delete the corresponding
// // `hash`, otherwise you are communicating that you expect to find the old hash at
// // the new URL.
// .url = "https://example.com/foo.tar.gz",
//
// // This is computed from the file contents of the directory of files that is
// // obtained after fetching `url` and applying the inclusion rules given by
// // `paths`.
// //
// // This field is the source of truth; packages do not come from a `url`; they
// // come from a `hash`. `url` is just one of many possible mirrors for how to
// // obtain a package matching this `hash`.
// //
// // Uses the [multihash](https://multiformats.io/multihash/) format.
// .hash = "...",
//
// // When this is provided, the package is found in a directory relative to the
// // build root. In this case the package's hash is irrelevant and therefore not
// // computed. This field and `url` are mutually exclusive.
// .path = "foo",
// // When this is set to `true`, a package is declared to be lazily
// // fetched. This makes the dependency only get fetched if it is
// // actually used.
// .lazy = false,
//},
},
// Specifies the set of files and directories that are included in this package.
// Only files and directories listed here are included in the `hash` that
// is computed for this package. Only files listed here will remain on disk
// when using the zig package manager. As a rule of thumb, one should list
// files required for compilation plus any license(s).
// Paths are relative to the build root. Use the empty string (`""`) to refer to
// the build root itself.
// A directory listed here means that all files within, recursively, are included.
.paths = .{
"build.zig",
"build.zig.zon",
"src",
// For example...
//"LICENSE",
//"README.md",
},
}

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src/batteryinfo.zig Normal file
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const std = @import("std");
const _maxRead = 4096;
pub const BatteryInfo = struct {
Manufacturer: []u8,
Model: []u8,
Technology: []u8,
CellSeriesCount: u32 = 0,
Capacity: u32 = 0,
CapacityDesign: u32 = 0,
Vnow: f32 = 0,
Vmin: f32 = 0,
ChargeNow: u32 = 0,
ChargeFull: u32 = 0,
ChargeFullPercentageDesign: u32 = 0,
ChargeFullDesign: u32 = 0,
_allocator: std.mem.Allocator,
pub fn deinit(self: *const BatteryInfo) void {
self._allocator.free(self.Manufacturer);
self._allocator.free(self.Model);
self._allocator.free(self.Technology);
}
};
fn _readInfo(allocator: std.mem.Allocator, dir: std.fs.Dir, path: []const u8) ![]u8 {
const start = try dir.readFileAlloc(allocator, path, _maxRead);
defer allocator.free(start);
const trimmed = std.mem.trim(u8, start, "\r\n\t ");
return allocator.dupe(u8, trimmed);
}
fn _readInfoU32(allocator: std.mem.Allocator, dir: std.fs.Dir, path: []const u8) !u32 {
const info = try _readInfo(allocator, dir, path);
defer allocator.free(info);
return std.fmt.parseInt(u32, info, 10);
}
pub fn GetBatteryInfoAlloc(allocator: std.mem.Allocator, dir: std.fs.Dir) !BatteryInfo {
const manufacturer = try _readInfo(allocator, dir, "manufacturer");
const model = try _readInfo(allocator, dir, "model_name");
const technology = try _readInfo(allocator, dir, "technology");
var info = BatteryInfo{
.Manufacturer = manufacturer,
.Model = model,
.Technology = technology,
._allocator = allocator,
};
info.Capacity = try _readInfoU32(allocator, dir, "capacity");
info.ChargeNow = try _readInfoU32(allocator, dir, "energy_now") / 1000;
info.ChargeFull = try _readInfoU32(allocator, dir, "energy_full") / 1000;
info.ChargeFullDesign = try _readInfoU32(allocator, dir, "energy_full_design") / 1000;
if(info.ChargeFullDesign != 0) {
info.ChargeFullPercentageDesign = 100 * info.ChargeFull / info.ChargeFullDesign;
info.CapacityDesign = 100 * info.ChargeNow / info.ChargeFullDesign;
}
const Vnow = try _readInfoU32(allocator, dir, "voltage_now") / 1000;
const Vmin = try _readInfoU32(allocator, dir, "voltage_min_design") / 1000;
info.Vnow = @as(f32, @floatFromInt(Vnow)) / 1000;
info.Vmin = @as(f32, @floatFromInt(Vmin)) / 1000;
info.CellSeriesCount = @intFromFloat(@ceil(info.Vmin / 3.7));
return info;
}

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src/main.zig Normal file
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const std = @import("std");
const batinfo = @import("batteryinfo.zig");
pub fn main() !void {
var buffer: [65535]u8 = undefined;
var fba = std.heap.FixedBufferAllocator.init(&buffer);
const allocator = fba.allocator();
const powerSupply = try std.fs.cwd().openDir("/sys/class/power_supply", .{});
var i:u32 = 0;
while(true) : (i += 1) {
const name = try std.fmt.allocPrint(allocator, "BAT{}", .{i});
defer allocator.free(name);
const batDir = powerSupply.openDir(name, .{}) catch |err| switch(err) {
error.FileNotFound => {return;},
else => {return err;},
};
const battery = try batinfo.GetBatteryInfoAlloc(allocator, batDir);
defer battery.deinit();
try printBattery(battery);
}
}
fn printBattery(battery: batinfo.BatteryInfo) !void {
const stdout = std.io.getStdOut().writer();
try stdout.print("Battery {s} {s}\n", .{battery.Manufacturer, battery.Model});
try stdout.print("\tTechnology: {s}\n", .{battery.Technology});
try stdout.print("\tCell series count: {}s\n\n", .{battery.CellSeriesCount});
try stdout.print("\tCapacity: {}%\n", .{battery.Capacity});
try stdout.print("\tCapacity (design): {}%\n", .{battery.CapacityDesign});
try stdout.print("\tVmin: {d:.2}V Per cell: {d:.2}V\n", .{battery.Vmin, battery.Vmin/@as(f32, @floatFromInt(battery.CellSeriesCount))});
try stdout.print("\tVnow: {d:.2}V Per cell: {d:.2}V\n", .{battery.Vnow, battery.Vnow/@as(f32, @floatFromInt(battery.CellSeriesCount))});
try stdout.print("\tCharge now: {}mAh\n", .{battery.ChargeNow});
try stdout.print("\tCharge full: {}mAh\n", .{battery.ChargeFull});
try stdout.print("\tCharge full (design): {}mAh\n\n", .{battery.ChargeFullDesign});
}