upd

1 files changed, 53 insertions, 0 deletions

diff --git a/csrc/sh.c b/csrc/sh.c
new file mode 100644
index 0000000..7372d2d
--- /dev/null
+++ b/csrc/sh.c
@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <unistd.h>
+
+#define MAXLINE 80
+
+int shell() {
+  char line[MAXLINE];
+  char *args[MAXLINE / 2 + 1];
+  int should_run = 1;
+
+  while (should_run) {
+    printf(">");
+    fflush(stdout);
+
+    if (!fgets(line, MAXLINE, stdin)) {
+      break;
+    }
+
+    line[strlen(line) - 1] = '\0';
+
+    int i = 0;
+    args[i] = strtok(line, " ");
+    while (args[i] != NULL) {
+      i++;
+      args[i] = strtok(NULL, " ");
+    }
+
+    if (args[0] == NULL) {
+      continue;
+    }
+
+    if (strncmp(args[0], "exit", 4) == 0) {
+      break;
+    }
+
+    pid_t pid = fork();
+    if (pid < 0) {
+      perror("fork");
+      return 1;
+    } else if (pid == 0) {
+      if (execvp(args[0], args) == -1) {
+        perror("execvp");
+      }
+      return 1;
+    } else {
+      wait(NULL);
+    }
+  }
+}