feat: a pseudo shell environment for basic interacting and testing purpose

[lunaix-os.git] / lunaix-os / kernel / demos / simple_sh.c

diff --git a/lunaix-os/kernel/demos/simple_sh.c b/lunaix-os/kernel/demos/simple_sh.c
new file mode 100644 (file)
index 0000000..036550a
--- /dev/null
+++ b/lunaix-os/kernel/demos/simple_sh.c
@@ -0,0 +1,105 @@
+#include <lunaix/fctrl.h>
+#include <lunaix/foptions.h>
+#include <lunaix/lunistd.h>
+#include <lunaix/proc.h>
+#include <lunaix/status.h>
+
+#include <klibc/string.h>
+#include <ulibc/stdio.h>
+
+char pwd[512];
+
+/*
+    Simple shell - (actually this is not even a shell)
+    It just to make the testing more easy.
+*/
+
+void
+parse_cmdline(char* line, char** cmd, char** arg_part)
+{
+    strrtrim(line);
+    line = strltrim_safe(line);
+    int l = 0;
+    char c = 0;
+    while ((c = line[l])) {
+        if (c == ' ') {
+            line[l++] = 0;
+            break;
+        }
+        l++;
+    }
+    *cmd = line;
+    *arg_part = strltrim_safe(line + l);
+}
+
+void
+sh_printerr()
+{
+    int errno = geterrno();
+    switch (errno) {
+        case ENOTDIR:
+            printf("Error: Not a directory\n");
+            break;
+        case ENOENT:
+            printf("Error: No such file or directory\n");
+            break;
+        case EINVAL:
+            printf("Error: Invalid parameter or operation\n");
+            break;
+        case ENOTSUP:
+            printf("Error: Not supported\n");
+            break;
+        case EROFS:
+            printf("Error: File system is read only\n");
+            break;
+        case ENOMEM:
+            printf("Error: Out of memory\n");
+            break;
+        default:
+            printf("Error: Fail to open (%d)\n", errno);
+            break;
+    }
+}
+
+void
+sh_main()
+{
+    char buf[512];
+    char *cmd, *argpart;
+
+    while (1) {
+        getcwd(pwd, 512);
+        printf("%s> ", pwd);
+        size_t sz = read(stdin, buf, 512);
+        if (sz < 0) {
+            printf("fail to read user input (%d)\n", geterrno());
+            return;
+        }
+        buf[sz - 1] = '\0';
+        parse_cmdline(buf, &cmd, &argpart);
+        if (streq(cmd, "cd")) {
+            if (chdir(argpart) < 0) {
+                sh_printerr();
+            }
+        } else if (streq(cmd, "ls")) {
+            int fd = open(argpart, 0);
+            if (fd < 0) {
+                sh_printerr();
+            } else {
+                struct dirent ent = { .d_offset = 0 };
+                int status;
+                while ((status = readdir(fd, &ent)) == 1) {
+                    printf(" %s\n", ent.d_name);
+                }
+
+                if (status < 0)
+                    sh_printerr();
+
+                close(fd);
+            }
+        } else {
+            printf("unknow command");
+        }
+        printf("\n");
+    }
+}
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