proc_pipe.zig

const std = @import("std");
const ChildProcess = std.ChildProcess;
const File = std.fs.File;

pub fn main() !void {
    const args = std.os.argv;
    if (args.len != 3) {
        std.debug.warn("Usage: {} <elf file> <map file>\n", args[0][0..strlen(args[0])]);
        return;
    }

    const elf_file_path = args[1][0..strlen(args[1])];
    const map_file_path = args[2][0..strlen(args[2])];
    const elf_file = try File.openRead(elf_file_path);
    const map_file = try File.openWrite(map_file_path);

    const allocator = std.heap.direct_allocator;

    const readelf_proc = try ChildProcess.init([_][]const u8{ "readelf", "-s", elf_file_path }, allocator);
    readelf_proc.stdout_behavior = ChildProcess.StdIo.Pipe;
    readelf_proc.stdout = map_file;
    _ = try readelf_proc.spawn();
}

fn strlen(str: [*]u8) usize {
    var i: usize = 0;
    while (str[i] != 0) : (i += 1) {}
    return i;
}