20060303a

1 files changed, 91 insertions, 0 deletions

diff --git a/appl/lib/env.b b/appl/lib/env.b
new file mode 100644
index 00000000..b2fa064c
--- /dev/null
+++ b/appl/lib/env.b
@@ -0,0 +1,91 @@
+implement Env;
+
+#
+# Copyright © 2000 Vita Nuova Limited.  All rights reserved.
+#
+
+include "sys.m";
+	sys: Sys;
+include "draw.m";
+include "bufio.m";
+include "readdir.m";
+include "env.m";
+
+ENVDIR : con "/env/";
+
+setenv(var: string, val: string): int
+{
+	init();
+	if (var == nil || !nameok(var)) {
+		sys->werrstr("bad variable name");
+		return -1;
+	}
+	if (val == nil) {
+		sys->remove(ENVDIR+var);
+		return 0;
+	}
+	fd := sys->create(ENVDIR+var, Sys->OWRITE, 8r600);
+	if (fd == nil)
+		return -1;
+	valb := array of byte val;
+	if (sys->write(fd, valb, len valb) != len valb)
+		return -1;
+	return 0;
+}
+
+getenv(var: string): string
+{
+	init();
+	if (var == nil || !nameok(var))
+		return nil;
+	fd := sys->open(ENVDIR+var, Sys->OREAD);
+	if (fd == nil)
+		return nil;
+	(ok, stat) := sys->fstat(fd);
+	if (ok == -1)
+		return nil;
+	buf := array[int stat.length] of byte;
+	n := sys->read(fd, buf, len buf);
+	if (n < 0)
+		return nil;
+	return string buf[0:n];
+}
+
+getall(): list of (string, string)
+{
+	readdir := load Readdir Readdir->PATH;
+	if (readdir == nil)
+		return nil;
+	(a, n) := readdir->init(ENVDIR,
+			Readdir->NONE | Readdir->COMPACT | Readdir->DESCENDING);
+	vl: list of (string, string);
+	for (i := 0; i < len a; i++)
+		vl = (a[i].name, getenv(a[i].name)) :: vl;
+	return vl;
+}
+
+# clone the current environment
+clone(): int
+{
+	init();
+	return sys->pctl(sys->FORKENV, nil);
+}
+
+new(): int
+{
+	init();
+	return sys->pctl(sys->NEWENV, nil);
+}
+
+init()
+{
+	if (sys == nil)
+		sys = load Sys Sys->PATH;
+}
+
+nameok(var: string): int
+{
+	for(i:=0; i<len var; i++) 
+		if (var[i] == '/') return 0;
+	return 1;
+}