add POSIX.2 identifiers

1 files changed, 34 insertions, 0 deletions

diff --git a/src/unistd/confstr.c b/src/unistd/confstr.c
new file mode 100644
index 00000000..a0f57b30
--- /dev/null
+++ b/src/unistd/confstr.c
@@ -0,0 +1,34 @@
+#include <unistd.h>
+#include "errno.h"
+#include "string.h"
+
+size_t confstr(int name, char *buf, size_t len)
+{
+	char *value = NULL;
+
+	if (len > 0) {
+		__ASSERT_NONNULL(buf);
+	}
+
+	switch (name) {
+	#include "_confstr.h"
+	default:
+		value = NULL;
+		break;
+	}
+
+	if (value == NULL) {
+		errno = EINVAL;
+		return 0;
+	}
+
+	if (len > 0) {
+		strncpy(buf, value, len);
+	}
+
+	return strlen(value);
+}
+
+/*
+POSIX(2)
+*/