1 files changed, 84 insertions, 0 deletions
diff --git a/smash/exec.c b/smash/exec.c
new file mode 100644
index 0000000..3b62f41
--- /dev/null
+++ b/smash/exec.c
@@ -0,0 +1,84 @@
+#include "exec.h"
+
+#include "../lib/sys/execve.h"
+#include "../lib/sys/fork.h"
+#include "../lib/sys/wait4.h"
+#include "../lib/sys/pipe.h"
+#include "../lib/sys/dup2.h"
+#include "../lib/sys/close.h"
+#include "../lib/sys/io.h"
+#include "../lib/sys/exit.h"
+#include "../lib/cstr/cstr.h"
+
+#include "parser.h"
+#include "builtin.h"
+
+void print_call(char **argv)
+{
+	while (*argv) {
+		write(STDOUT_FD, *argv, cstr_length(*argv));
+		write(STDOUT_FD, "\n", 1);
+		++argv;
+	}
+}
+
+void exec(char *line)
+{
+	expression_list_t *exps = new_expression_from_line(line);
+	expression_list_t *exp = exps;
+	char **envp = { 0 };
+
+	int pid;
+	int pipefd[2][2];
+	pipefd[0][PIPE_IN] = STDOUT_FD;
+	pipefd[0][PIPE_OUT] = STDIN_FD;
+
+	while (exp) {
+		char **argv = new_argv(exp->call);
+
+		pipe(pipefd[1]);
+
+		if (has_builtin_with_name(argv[0])) {
+			run_builtin(argv[0], (const char**)argv);
+			break;
+		}
+
+		pid = fork();
+
+		if (pid == 0) {
+			if (pipefd[0][PIPE_OUT] != STDIN_FD) {
+				dup2(pipefd[0][PIPE_OUT], STDIN_FD);
+				close(pipefd[0][PIPE_OUT]);
+				close(pipefd[0][PIPE_IN]);
+			}
+			if (exp->next)
+				dup2(pipefd[1][PIPE_IN], STDOUT_FD);
+
+			close(pipefd[1][PIPE_OUT]);
+			close(pipefd[1][PIPE_IN]);
+
+			execve(argv[0], argv, envp);
+			write(STDOUT_FD, "command not found: ", 19);
+			write(STDOUT_FD, argv[0], cstr_length(argv[0]));
+			write(STDOUT_FD, "\n", 1);
+			exit(-1);
+		}
+
+		if (pipefd[0][PIPE_OUT] != STDIN_FD) {
+			close(pipefd[0][PIPE_IN]);
+			close(pipefd[0][PIPE_OUT]);
+		}
+		close(pipefd[1][PIPE_IN]);
+
+		pipefd[0][0] = pipefd[1][0];
+		pipefd[0][1] = pipefd[1][1];
+
+		free_argv(argv);
+
+		wait4(pid, 0, 0);
+		exp = exp->next;
+	}
+
+	free_expression(exps);
+}
+