From 6b47ff2690b473e86adf6ded723619b546047d7e Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Thu, 21 May 2020 12:28:02 +0200
Subject: memory should be fixed? i think

---
 02_exercise/shell.c | 55 +++++++++++++++++++++++++++++++----------------------
 1 file changed, 32 insertions(+), 23 deletions(-)

diff --git a/02_exercise/shell.c b/02_exercise/shell.c
index 5a8d48f..c960680 100644
--- a/02_exercise/shell.c
+++ b/02_exercise/shell.c
@@ -10,13 +10,14 @@
 
 void print_prompt();
 
-int parse_line(char const *line, char **exe, char ***parts, size_t *part_count);
+int parse_line(char const *line, char ***parts, size_t *part_count);
 
 // returns the return code of the executed program
 int exec_command(const char *path, char *const argv[], unsigned timeout);
 
 int main(int argc, char* argv[]) {
-    while (true) {
+    bool done = false;
+    while (!done) {
         char *line = NULL;
         size_t cap = 0;
         size_t length = 0;
@@ -29,35 +30,48 @@ int main(int argc, char* argv[]) {
 
         line[length - 1] = '\0'; // cut the line feed
 
-        char *exe = NULL;
         char **arguments = NULL;
         size_t argument_count;
-        parse_line(line, &exe, &arguments, &argument_count);
+        parse_line(line, &arguments, &argument_count);
 
-        if (strcmp(exe, "cd") == 0) {
-            printf("Changing dirs \n");
-            chdir("beispiele");
-        } else if (strcmp(exe, "exit") == 0) {
-            exit(0);
+        if (strcmp(arguments[0], "cd") == 0) {
+            if (arrayLen(arguments) != 3) {
+                fprintf(stderr, "usage: cd <path>");
+                goto clean;
+            }
+            int ret = chdir(arguments[1]);
+            if (ret)
+                printf("[%i] ", ret);
+        } else if (strcmp(arguments[0], "exit") == 0) {
+            done = true;
         } else {
-            exec_command(exe, arguments, 0);
+            int ret = exec_command(arguments[0], arguments, 0);
+            if (ret)
+                printf("[%i] ", ret);
         }
+
+        clean:
         free((void *)line);
-        // no need to free exe, since it is part of arguments any way
+        while (arrayLen(arguments) > 0) {
+            char *tmp = arrayPop(arguments);
+            if (tmp)
+                arrayRelease(tmp);
+        }
         arrayRelease(arguments);
     }
 }
 
-int parse_line(char const *line, char **exe, char ***parts, size_t *part_count) {
+int parse_line(char const *line, char ***parts, size_t *part_count) {
     char *part;
     char **local_parts;
 
-    if (arrayInit(part) != 0 || arrayInit(local_parts) != 0) {
+    arrayInit(part);
+    arrayInit(local_parts);
+/*    if (arrayInit(part) != 0 || arrayInit(local_parts) != 0) {
         fprintf(stderr, "Failed to prepare new part array");
         exit(-1);
-    }
+    }*/
 
-    bool found_exe = false;
     char c;
     int i = 0;
     while (true) {
@@ -65,16 +79,11 @@ int parse_line(char const *line, char **exe, char ***parts, size_t *part_count)
         if (c == ' ' || c == '\0') {
             arrayPush(part) = '\0';
             arrayPush(local_parts) = part;
-            if (!found_exe) {
-                // the first is the executable
-                *exe = malloc(arrayLen(part) * sizeof(char));
-                strcpy(*exe, part);
-                found_exe = true;
-            }
-            arrayInit(part);
             if (c == '\0') {
                 arrayPush(local_parts) = NULL;
                 break;
+            } else {
+                arrayInit(part);
             }
         } else {
             arrayPush(part) = c;
@@ -110,7 +119,7 @@ int exec_command(const char *path, char *const argv[], unsigned timeout) {
         dup2(pipefd[1], 1); // includes close(1);
         close(pipefd[1]);
         execvp(path, argv);
-        fprintf(stderr, "no program\n");
+        fprintf(stderr, "could not execute \"%s\"\n", path);
         exit(-1);
     }
 
-- 
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