ver 1

Signed-off-by: czjstmax <jstmaxlol@disroot.org>

1 files changed, 100 insertions, 0 deletions

diff --git a/nosh.c b/nosh.c
new file mode 100644
index 0000000..14065c7
--- /dev/null
+++ b/nosh.c
@@ -0,0 +1,100 @@
+/*
+ * nosh - noshell
+ * a 2-hour C shell for POSIX mates
+ *
+ * czjstmax <jstmaxlol at disroot dot org>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <wordexp.h>
+#include <sys/wait.h>
+
+//
+void handlecc(int sig);
+void freeStuff();
+
+//
+char *line = NULL;
+size_t len = 0;
+wordexp_t p;
+
+int main(void)
+{
+    signal(SIGINT, handlecc);
+
+    while (true) {
+        printf("$ ");
+        getline(&line, &len, stdin);
+
+        line[strcspn(line, "\n")] = '\0';
+
+        wordexp(line, &p, 0);
+
+        // debug
+//         for (size_t i = 0; i < p.we_wordc; i++) {
+//             printf("argv[%zu] = %s\n", i, p.we_wordv[i]);
+//         }
+
+        if (strlen(line) == 0)
+            continue;               //otherwise.. SIGSEGV!
+        if (strcmp(p.we_wordv[0], ":q") == 0 || strcmp(p.we_wordv[0], "exit") == 0) {
+            freeStuff();
+            return 0;
+        }
+        else if (strcmp(p.we_wordv[0], "echo") == 0) {
+            for (size_t i = 1; i < p.we_wordc; i++)
+                printf("%s ", p.we_wordv[i]);
+            if (p.we_wordc >= 2) {
+                if (strcmp(p.we_wordv[1], "-c") == 0)
+                    continue;
+                printf("\n");
+            }
+        }
+        else if (strcmp(p.we_wordv[0], "cd") == 0) {
+            if (chdir(p.we_wordv[1]))
+                perror("nsh! ERROR: failed to change directory");
+        }
+        else if (strcmp(p.we_wordv[0], "clear") == 0) {
+            printf("\033[2J\033[H\033[3J");
+            fflush(stdout);
+        }
+        else {
+            pid_t pid = fork();
+            char **argv = p.we_wordv; // pray with me now
+            if (pid == 0) {
+                char path[strlen("/usr/bin/") + strlen(p.we_wordv[0]) + 1];
+                sprintf(path, "/usr/bin/%s", p.we_wordv[0]);
+                execv(path, argv);
+                perror("nsh! ERROR: failed to execv()");
+                _exit(1);
+            }
+            else if (pid > 0) {
+                int status;
+                waitpid(pid, &status, 0);
+            }
+            else {
+                printf("nsh! couldn't open %s", p.we_wordv[0]);
+            }
+        }
+    }
+}
+
+void handlecc(int sig)
+{
+    printf("\nnsh! %d caught.\nfreeing stuff before quitting.\n", sig);
+    freeStuff();
+    exit(0);
+}
+
+void freeStuff()
+{
+    wordfree(&p);
+    free(line);
+}
+