From cfe00d3316dc1a8135c861c741bf59a07292588d Mon Sep 17 00:00:00 2001
From: Josh Megnauth <jo.sh@tutanota.com>
Date: Fri, 8 Aug 2025 02:34:59 -0400
Subject: [PATCH] Add paths.h for Fish

Fish only requires BSHELL. The constants are implementation specific so
this header will evolve as needed.

Cbindgen doesn't emit defines for strings (even CStrs) so I only
provided what's needed for Fish in a C header for now with the ideal
implementation, in Rust, unbuilt.
---
 include/paths.h                 |  6 ++++++
 src/header/_paths/cbindgen.toml |  5 +++++
 src/header/_paths/linux.rs      | 29 +++++++++++++++++++++++++++++
 src/header/_paths/mod.rs        | 11 +++++++++++
 src/header/_paths/redox.rs      | 13 +++++++++++++
 src/header/mod.rs               |  2 ++
 6 files changed, 66 insertions(+)
 create mode 100644 include/paths.h
 create mode 100644 src/header/_paths/cbindgen.toml
 create mode 100644 src/header/_paths/linux.rs
 create mode 100644 src/header/_paths/mod.rs
 create mode 100644 src/header/_paths/redox.rs

diff --git a/include/paths.h b/include/paths.h
new file mode 100644
index 0000000000..8bbfa920c6
--- /dev/null
+++ b/include/paths.h
@@ -0,0 +1,6 @@
+#ifndef _RELIBC_PATHS_H
+#define _RELIBC_PATHS_H
+
+#define _PATH_BSHELL "/bin/sh"
+
+#endif
diff --git a/src/header/_paths/cbindgen.toml b/src/header/_paths/cbindgen.toml
new file mode 100644
index 0000000000..885a98f571
--- /dev/null
+++ b/src/header/_paths/cbindgen.toml
@@ -0,0 +1,5 @@
+include_guard = "_RELIBC_PATHS_H"
+language = "C"
+style = "Type"
+no_includes = true
+cpp_compat = true
diff --git a/src/header/_paths/linux.rs b/src/header/_paths/linux.rs
new file mode 100644
index 0000000000..34cf290f7a
--- /dev/null
+++ b/src/header/_paths/linux.rs
@@ -0,0 +1,29 @@
+//! Linux specific constants for paths.h.
+//! Entirely borrowed from musl as there isn't a list of what to include.
+
+pub const _PATH_DEFPATH: &str = "/usr/local/bin:/bin:/usr/bin";
+pub const _PATH_STDPATH: &str = "/bin:/usr/bin:/sbin:/usr/sbin";
+
+pub const _PATH_BSHELL: &str = "/bin/sh";
+pub const _PATH_CONSOLE: &str = "/dev/console";
+pub const _PATH_DEVNULL: &str = "/dev/null";
+pub const _PATH_KLOG: &str = "/proc/kmsg";
+pub const _PATH_LASTLOG: &str = "/var/log/lastlog";
+pub const _PATH_MAILDIR: &str = "/var/mail";
+pub const _PATH_MAN: &str = "/usr/share/man";
+pub const _PATH_MNTTAB: &str = "/etc/fstab";
+pub const _PATH_NOLOGIN: &str = "/etc/nologin";
+pub const _PATH_SENDMAIL: &str = "/usr/sbin/sendmail";
+pub const _PATH_SHADOW: &str = "/etc/shadow";
+pub const _PATH_SHELLS: &str = "/etc/shells";
+pub const _PATH_TTY: &str = "/dev/tty";
+pub const _PATH_UTMP: &str = "/var/run/utmp";
+pub const _PATH_WTMP: &str = "/var/log/wtmp";
+pub const _PATH_VI: &str = "/usr/bin/vi";
+
+// Trailing backslash intentional as these are dir paths.
+pub const _PATH_DEV: &str = "/dev/";
+pub const _PATH_TMP: &str = "/tmp/";
+pub const _PATH_VARDB: &str = "/var/lib/misc/";
+pub const _PATH_VARRUN: &str = "/var/run/";
+pub const _PATH_VARTMP: &str = "/var/tmp/";
diff --git a/src/header/_paths/mod.rs b/src/header/_paths/mod.rs
new file mode 100644
index 0000000000..7c391b437c
--- /dev/null
+++ b/src/header/_paths/mod.rs
@@ -0,0 +1,11 @@
+//! Implementation specific, non-standard path aliases
+
+#[cfg(target_os = "linux")]
+#[path = "linux.rs"]
+mod sys;
+
+#[cfg(target_os = "redox")]
+#[path = "redox.rs"]
+mod sys;
+
+pub use sys::*;
diff --git a/src/header/_paths/redox.rs b/src/header/_paths/redox.rs
new file mode 100644
index 0000000000..a2a0ed0274
--- /dev/null
+++ b/src/header/_paths/redox.rs
@@ -0,0 +1,13 @@
+//! Redox specific constants for paths.h.
+
+// NOTE: Cross check that new entries correspond to files on Redox before adding.
+
+pub const _PATH_BSHELL: &str = "/bin/sh";
+pub const _PATH_DEVNULL: &str = "/dev/null";
+pub const _PATH_MAN: &str = "/usr/share/man";
+pub const _PATH_TTY: &str = "/dev/tty";
+
+// Trailing backslash intentional as these are dir paths.
+pub const _PATH_DEV: &str = "/dev/";
+pub const _PATH_TMP: &str = "/tmp/";
+pub const _PATH_VARTMP: &str = "/var/tmp/";
diff --git a/src/header/mod.rs b/src/header/mod.rs
index cbd1480738..4ad22103f3 100644
--- a/src/header/mod.rs
+++ b/src/header/mod.rs
@@ -47,6 +47,8 @@ pub mod netinet_in;
 pub mod netinet_ip;
 pub mod netinet_tcp;
 // TODO: nl_types.h
+// TODO: Remove C header paths.h when cbindgen can export C/Rust strs
+// pub mod paths;
 pub mod poll;
 pub mod pthread;
 pub mod pty;