fixed some memory leaks

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

1 files changed, 113 insertions, 0 deletions

diff --git a/nm.c b/nm.c
new file mode 100644
index 0000000..7d1cf78
--- /dev/null
+++ b/nm.c
@@ -0,0 +1,113 @@
+/* noshmore
+ * an extended version of nosh,
+ * the minimal POSIX C shell.
+ * -> generally: adds some functionality.
+ *
+ * von 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 FreeAll(int n);
+
+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);
+
+        if (strlen(line) == 0) {
+            FreeAll(1);
+            continue;
+        }
+        if (strcmp(p.we_wordv[0], ":q") == 0 || strcmp(p.we_wordv[0], "exit") == 0) {
+            FreeAll(0);
+            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)
+                    printf("\n");
+                else continue;
+            }
+        }
+        else if (strcmp(p.we_wordv[0], "cd") == 0) {
+            if (p.we_wordc <= 1) {
+                printf("nsh+! cd: no arguments were given.\n");
+                FreeAll(1);
+                continue;
+            }
+            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 if (strcmp(p.we_wordv[0], "help") == 0) {
+            printf(
+                "noshmore\n"
+                "an extended version of nosh, the minimal POSIX C shell.\n"
+                "\n"
+                "built-ins:\n"
+                "echo  -> outputs a string of text, doesn't need \" enclosure.\n"
+                "         supports '-c' for output without '\\n'"
+                "clear -> clears screen (and scrollback)\n"
+                "cd    -> change working directory\n"
+                "help  -> prints this screen\n"
+                "\ngithub repo: github.com/jstmaxlol/noshmore\n"
+            );
+        }
+        else {
+            pid_t pid = fork();
+            char **argv = p.we_wordv; // pray with me now
+            if (pid == 0) {
+                execvp(p.we_wordv[0], argv);
+                perror("nsh+! ERROR: failed to execvp()");
+                FreeAll(0);
+                _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);
+    FreeAll(0);
+    exit(0);
+}
+
+void FreeAll(int n)
+{
+    wordfree(&p);
+    if (n == 0)
+        free(line);
+}