syscall: refactor environment handling

  * Move environment functions to their own files.
  * Rewrite the WASIp2 version of environment variables to be much
    simpler (don't go through C functions).

1 files changed, 45 insertions, 0 deletions

diff --git a/src/syscall/env_nonhosted.go b/src/syscall/env_nonhosted.go
new file mode 100644
index 000000000..446ba55d2
--- /dev/null
+++ b/src/syscall/env_nonhosted.go
@@ -0,0 +1,45 @@
+//go:build baremetal || js || wasm_unknown
+
+package syscall
+
+func Environ() []string {
+	env := runtime_envs()
+	envCopy := make([]string, len(env))
+	copy(envCopy, env)
+	return envCopy
+}
+
+func Getenv(key string) (value string, found bool) {
+	env := runtime_envs()
+	for _, keyval := range env {
+		// Split at '=' character.
+		var k, v string
+		for i := 0; i < len(keyval); i++ {
+			if keyval[i] == '=' {
+				k = keyval[:i]
+				v = keyval[i+1:]
+			}
+		}
+		if k == key {
+			return v, true
+		}
+	}
+	return "", false
+}
+
+func Setenv(key, val string) (err error) {
+	// stub for now
+	return ENOSYS
+}
+
+func Unsetenv(key string) (err error) {
+	// stub for now
+	return ENOSYS
+}
+
+func Clearenv() (err error) {
+	// stub for now
+	return ENOSYS
+}
+
+func runtime_envs() []string