1 files changed, 67 insertions, 0 deletions
diff --git a/regular_builtins.c b/regular_builtins.c
new file mode 100644
index 0000000..5cdb4fe
--- /dev/null
+++ b/regular_builtins.c
@@ -0,0 +1,67 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+int
+true_main(int argc, char **argv)
+{
+	(void) argc;
+	(void) argv;
+	return 0;
+}
+
+
+int
+false_main(int argc, char **argv)
+{
+	(void) argc;
+	(void) argv;
+	return 1;
+}
+
+
+BUILTIN_USAGE(pwd_usage, "[-L | -P]")
+int
+pwd_main(int argc, char **argv)
+{
+	void (*usage)(void) = pwd_usage;
+        int physical = 0;
+        char *cwd = NULL;
+        size_t size = 64 / 2;
+        const char *pwd;
+	struct stat cst, pst;
+
+	ARGBEGIN {
+	case 'L':
+		physical = 0;
+		break;
+	case 'P':
+		physical = 1;
+		break;
+	default:
+		usage();
+	} ARGEND;
+
+	if (argc)
+		weprintf("ignoring operands"); /* other implementations either warn or are silent, they don't fail */
+
+	for (;;) {
+		cwd = erealloc(cwd, size *= 2);
+		if (getcwd(cwd, size))
+			break;
+		if (errno != ERANGE)
+			eprintf("getcwd %zu:", size);
+	}
+
+	if (physical || !(pwd = getenv("PWD")) || *pwd != '/' || stat(pwd, &pst) || stat(cwd, &cst))
+		puts(cwd);
+	else if (pst.st_dev == cst.st_dev && pst.st_ino == cst.st_ino)
+		puts(pwd);
+	else
+		puts(cwd);
+
+	free(cwd);
+	if (fflush(stdout) || ferror(stdout))
+		weprintf("fflush <stdout>:");
+	return 0;
+}