From 766b5d4d6ae55d0f08d9a0d10dc1e477ebd4e224 Mon Sep 17 00:00:00 2001
From: Gideon Bature <infoaboutgideon@gmail.com>
Date: Wed, 26 Jul 2023 01:41:07 +0100
Subject: [PATCH 1/6] fix betty

---
 linkedlist.c |  84 ++++++++++++++++++++++++++++++++++++---------------
 main.c       |   1 +
 main.h       |   1 +
 shell        | Bin 17552 -> 0 bytes
 4 files changed, 62 insertions(+), 24 deletions(-)
 delete mode 100755 shell

diff --git a/linkedlist.c b/linkedlist.c
index b63b765..5c6618a 100644
--- a/linkedlist.c
+++ b/linkedlist.c
@@ -3,78 +3,114 @@
 envstruct *insert_end(envstruct *head, char *key, char *value)
 {
 	envstruct *new_node = malloc(sizeof(envstruct));
-	
-	if (new_node == NULL) {
-		return NULL;
+
+	if (new_node == NULL)
+	{
+		return (NULL);
 	}
 
 	new_node->key = strdup(key);
 	new_node->value = strdup(value);
 	new_node->next = NULL;
 
-	if (head == NULL) {
-		return new_node;
+	if (head == NULL)
+	{
+		return (new_node);
 	}
 
 	envstruct *curr = head;
-	while (curr->next != NULL) {
+
+	while (curr->next != NULL)
+	{
 		curr = curr->next;
 	}
 	curr->next = new_node;
 
-	return head;
+	return (head);
 }
 
+/**
+ * get_value - gets value of env var
+ * @head: head variable
+ * @key: value variable
+ *
+ * Return: NULL
+*/
 char *get_value(envstruct *head, char *key)
 {
 	envstruct *curr = head;
-	
-	if (head == NULL || key == NULL) {
-		return NULL;
+
+	if (head == NULL || key == NULL)
+	{
+		return (NULL);
 	}
 
-	while (curr != NULL) {
-		if (strcmp(curr->key, key) == 0) {
-			return curr->value;
+	while (curr != NULL)
+	{
+		if (strcmp(curr->key, key) == 0)
+		{
+			return (curr->value);
 		}
 		curr = curr->next;
 	}
 
-	return NULL;
+	return (NULL);
 }
 
+/**
+ * remove_value - remove env variable
+ * @head: head variable
+ * @key: key variable
+ *
+ * Return: 0 or 1
+*/
 int remove_value(envstruct **head, char *key)
 {
-	if (head == NULL || *head == NULL) {
-		return 1;
+	if (head == NULL || *head == NULL)
+	{
+		return (1);
 	}
 
 	envstruct *curr = *head;
 	envstruct *prev = NULL;
 
-	while (curr != NULL) {
-		if (strcmp(curr->key, key) == 0) {
-			if (prev == NULL) {
+	while (curr != NULL)
+	{
+		if (strcmp(curr->key, key) == 0)
+		{
+			if (prev == NULL)
+			{
 				*head = curr->next;
-			} else {
+			}
+			else
+			{
 				prev->next = curr->next;
 			}
 			free(curr->key);
 			free(curr->value);
 			free(curr);
-			return 0;
+			return (0);
 		}
 
 		prev = curr;
 		curr = curr->next;
 	}
 
-	return 1;
+	return (1);
 }
 
-void free_list(envstruct *head) {
-	while (head != NULL) {
+/**
+ * free_list - frees the list_mem
+ * @head: head variable
+ *
+ * Return: void
+*/
+void free_list(envstruct *head)
+{
+	while (head != NULL)
+	{
 		envstruct *temp = head;
+
 		head = head->next;
 		free(temp->key);
 		free(temp->value);
diff --git a/main.c b/main.c
index fe8ceff..6d4384b 100644
--- a/main.c
+++ b/main.c
@@ -119,6 +119,7 @@ int is_builtin_cmd(char *cmd)
 /**
  * exec_builtin_cmd - execute builtin commands
  * @argv: argument vector - points to arguments entered
+ * @head: head of lists.
  *
  * Return: void
  */
diff --git a/main.h b/main.h
index 3721755..39022a0 100644
--- a/main.h
+++ b/main.h
@@ -25,6 +25,7 @@ typedef struct env_var
 	char *value;
 	struct env_var *next;
 } envstruct;
+
 extern char **environ;
 char *lineptr;
 
diff --git a/shell b/shell
deleted file mode 100755
index 9e81928790f98b7e458921e7baab08fb97d77f93..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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From d4386c17fb5ead5b7134c142c1956b1e43a605ee Mon Sep 17 00:00:00 2001
From: Gideon Bature <infoaboutgideon@gmail.com>
Date: Wed, 26 Jul 2023 02:47:34 +0100
Subject: [PATCH 2/6] implement the cd built-in function and fix the global
 variable issue

---
 linkedlist.c |   3 ++-
 main.c       |  19 +++++++++++++++++--
 main.h       |   4 ++--
 shell        | Bin 0 -> 22144 bytes
 4 files changed, 21 insertions(+), 5 deletions(-)
 create mode 100755 shell

diff --git a/linkedlist.c b/linkedlist.c
index 5c6618a..0778e6c 100644
--- a/linkedlist.c
+++ b/linkedlist.c
@@ -18,7 +18,8 @@ envstruct *insert_end(envstruct *head, char *key, char *value)
 		return (new_node);
 	}
 
-	envstruct *curr = head;
+	envstruct *curr;
+	curr = head;
 
 	while (curr->next != NULL)
 	{
diff --git a/main.c b/main.c
index 6d4384b..2f7a06c 100644
--- a/main.c
+++ b/main.c
@@ -1,6 +1,8 @@
 #include "main.h"
 int main(void);
 
+char *lineptr;
+
 /**
  * main - Entrance to program
  *
@@ -146,7 +148,10 @@ void exec_builtin_cmd(char **argv, envstruct *head)
 	}
 	if (strstr(argv[0], "cd") == argv[0])
 	{
-		/** cd_cmd(argv); */
+		if (cd_cmd(argv) == -1)
+		{
+			perror("");
+		}
 	}
 }
 
@@ -283,8 +288,18 @@ void unsetenv_cmd(char **argv, envstruct *head)
  *
  * Return: void
  */
-void cd_cmd(char **argv)
+int cd_cmd(char **argv)
 {
+	int stat;
+
+	stat = chdir(argv[1]);
+
+	if (stat == -1)
+	{
+		perror("");
+		return (-1);
+	}
+	return (0);
 
 }
 
diff --git a/main.h b/main.h
index 39022a0..f41e0c8 100644
--- a/main.h
+++ b/main.h
@@ -27,14 +27,14 @@ typedef struct env_var
 } envstruct;
 
 extern char **environ;
-char *lineptr;
+extern char *lineptr;
 
 void exit_cmd(int);
 void env_cmd(void);
 
 void setenv_cmd(char **argv, envstruct *head);
 void unsetenv_cmd(char **argv, envstruct *head);
-/** void cd_cmd(char **argv); */
+int cd_cmd(char **argv);
 
 void exec_builtin_cmd(char **argv, envstruct *head);
 void exec_executable_cmd(char *cmd, char **argv, char **env);
diff --git a/shell b/shell
new file mode 100755
index 0000000000000000000000000000000000000000..98ade317161ae03fc8fdf8ea893ce8f5236d9da1
GIT binary patch
literal 22144
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literal 0
HcmV?d00001


From 7c84497926bf7e7c709534699e39751c2a333a3b Mon Sep 17 00:00:00 2001
From: Gideon Bature <infoaboutgideon@gmail.com>
Date: Wed, 26 Jul 2023 03:02:16 +0100
Subject: [PATCH 3/6] fix whole code for full compilation

---
 linkedlist.c |   9 ++++-----
 main.c       |   9 ++++++---
 shell        | Bin 22144 -> 22144 bytes
 3 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/linkedlist.c b/linkedlist.c
index 0778e6c..5d560d6 100644
--- a/linkedlist.c
+++ b/linkedlist.c
@@ -2,6 +2,7 @@
 
 envstruct *insert_end(envstruct *head, char *key, char *value)
 {
+	envstruct *curr = head;
 	envstruct *new_node = malloc(sizeof(envstruct));
 
 	if (new_node == NULL)
@@ -18,8 +19,6 @@ envstruct *insert_end(envstruct *head, char *key, char *value)
 		return (new_node);
 	}
 
-	envstruct *curr;
-	curr = head;
 
 	while (curr->next != NULL)
 	{
@@ -67,14 +66,14 @@ char *get_value(envstruct *head, char *key)
 */
 int remove_value(envstruct **head, char *key)
 {
+	envstruct *curr = *head;
+	envstruct *prev = NULL;
+
 	if (head == NULL || *head == NULL)
 	{
 		return (1);
 	}
 
-	envstruct *curr = *head;
-	envstruct *prev = NULL;
-
 	while (curr != NULL)
 	{
 		if (strcmp(curr->key, key) == 0)
diff --git a/main.c b/main.c
index 2f7a06c..010eae7 100644
--- a/main.c
+++ b/main.c
@@ -10,9 +10,10 @@ char *lineptr;
  */
 int main(void)
 {
+	envstruct *head = NULL;
+
 	atexit(clean_up);
 	signal(SIGINT, sig_int_handler);
-	envstruct *head = NULL;
 
 	while (1)
 	{
@@ -235,7 +236,9 @@ void env_cmd(void)
  */
 void init_env_list(envstruct *head)
 {
-	while (*environ != NULL)
+	int i = 0;
+
+	while (environ[i] != NULL)
 	{
 		char *key = strtok(*environ, "="), *val = NULL;
 
@@ -246,7 +249,7 @@ void init_env_list(envstruct *head)
 		}
 		head = insert_end(head, key, val);
 
-		*environ++;
+		i++;
 	}
 }
 
diff --git a/shell b/shell
index 98ade317161ae03fc8fdf8ea893ce8f5236d9da1..eb43a924a9b3db1395ef9c9d2910311699afe937 100755
GIT binary patch
delta 2493
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HuO|NkhlnWS

delta 2434
zcmY*adrVVT7{3Rs3PD<sA}xi2Xps3}RS;$K359E>iF2~e=%R}nMK||{bfS|L)3B_&
zH0VCfd~7DhMW>Uf!A*Q1bw(=ADcM7r@eeoSyrsC|L@h#g_B;0$(I!3LcfRlUz0Wzf
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z&=di6DXf|`?RWGjCCA-6Sp*j2Ye9Z#1;RX_mI>cpObV0Xu5v{EMc|-0)1y^14I+O;
z)CdtYOxIXWi{ju*Nfs87TD!yjVXeZo&+wk64Y<{BVW#(kX$2W}3%5S=JPn|AVkjWU
z1|v0B38k1WYcqZ?y&CIEfN=GIutlg1Z)t+E@Ctcs(&#Zrr^2A_M+U7I9vai1mdW0`
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zQfFb;jI_WWgx+Yc2HRj9xh>v3?k?w>QR^PiFF`;4i}SOfH$iWK)~TF_LH7qaPr;p?
z*TMM|(E1SPZ-Z{`<h&Ae2k3Ut`=BR48}4)dD`@uLoOgp(gC^l-w}R$@X8ptY!e}W`
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z8LAWV)8v?FXOHRiiK(oP-Usg?AJ$=1k98jXgtd?EL)$|!lkAxe6ox1Jxu{Lg{0%|@
zH)zfzI~z;oSXYo2tB($04NxoAbri(9mtykl?CXY{yle5yNIkO)60}0#^*VZ(D48Uc
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z7CK+NfpySSXB~=db>=dn9_LcFlNOcaT6$A-+a%;5euvOz;kktNm5gAWbgJY=6icJe
TOFv{+C`PVh`3<||d&B+*9ANV+


From 90ab2dafbad445b8d258096370499065f03c5fd0 Mon Sep 17 00:00:00 2001
From: Gideon Bature <infoaboutgideon@gmail.com>
Date: Wed, 26 Jul 2023 03:16:15 +0100
Subject: [PATCH 4/6] initialize lineptr with NULL

---
 main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/main.c b/main.c
index 010eae7..4eeb0b7 100644
--- a/main.c
+++ b/main.c
@@ -1,7 +1,7 @@
 #include "main.h"
 int main(void);
 
-char *lineptr;
+char *lineptr = NULL;
 
 /**
  * main - Entrance to program

From 4aa30f7ca4a9484d7dd2309256a2f072e057da3d Mon Sep 17 00:00:00 2001
From: Gideon Bature <infoaboutgideon@gmail.com>
Date: Wed, 26 Jul 2023 03:31:07 +0100
Subject: [PATCH 5/6] add a return statement to env_cmd

---
 main.c |   1 +
 shell  | Bin 22144 -> 22144 bytes
 2 files changed, 1 insertion(+)

diff --git a/main.c b/main.c
index 4eeb0b7..fd2a55e 100644
--- a/main.c
+++ b/main.c
@@ -228,6 +228,7 @@ void env_cmd(void)
 		printf("%s\n", environ[i]);
 		i++;
 	}
+	return;
 }
 
 /**
diff --git a/shell b/shell
index eb43a924a9b3db1395ef9c9d2910311699afe937..00ea9a38a9f69cf7680215cc013a9223662473b1 100755
GIT binary patch
delta 1020
zcmYLIZAepL6n@{CndUy6A7Sd|0x>ba%|$2?dABQ+NGKNNpTMkN_Cre|F&YM!IaJ<+
zgrEo#`ymxe=+iACr&baau}G+>aKoi5m#tXbo_F_F7w$Rl`<&-I=iGC)vlH~}1ijgl
zka6R;kS<28!);~dhlIw{o}{b3G50{i$8^K?6hcJF7Z~B*mAKd4w@JH>4l`HIPCCbC
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zxV21UI%7PxCd*5D$c?A*j(mYBHe|9Ji+`wahYGi|ps65xa8;HiA?E0f$=z8<3K*26
zLRM%l%B(}w;iZxgaS9RfB3GMRWoen|tjBDiPncw`sBwUU29wd)OmKiA-IcgQRXK&2
z2M`H7#|eQRHBidJ=CV{Fev8kniWTSQZnb^m-T1i_uVsy27o07Ar?5a@IJ_FA2M_Da
z&#D>!$|od*Ir9?E@wo-L#jM^Vg0aT6FDpb`u^V<j-_rC5!kjS0d*g5u0DOe;uU@&D
zvecyL_yQ)5_=G554nD-D=ZWe%E7>;7X1d7imb$)!;5njlcQ!~Tb&C2VFl7uIQD<oO
z@v7eRt3{MPV`-zM;PiXD^f<ft8Qrvp!D{=@a)b<0Z;WqPB~(KYyk78-n&QE)mIQX;
z=F#&00@o1No9l^NzvY8&cQ7Q&w>5-Jev#!@@I}kA9DzRvpOHYwQ}}B5f)!bAh7Uog
z3%(XA7vPV$D=Oa7yjCtP=nUsId$j8{jj2f+2+0NX2}3MlMO9|{hBd&Ju;Z{tnFKq?
zuEWl<S=bXS2z!MkSDWdWyQq3apKUR5O+va9M-HPaBQcNztfJnY-IAxk&(!FU8Xb2J
n*IOz6owGt29brEO4_#(=ZSQC+8?|@Rd6p~=QmcDZT-5#n2`#mU

delta 1015
zcmYLITS!z<6g@|?QXFR-A7PF&YV^=ZnG}s)6nXXfAz5S@)K{YPQ6XpsX-0$5Wi+*2
zkrY8tNFRYP5f$hR6^)iuM3g-sqKDVioYHCv;k3@&TV1$&owN4ZYwvr`%+YK7=r!JV
zC^~t^=_B*g_SMIoZ@IAadD)#8hgro-UwicXBwJA&W2zR^&q(ZusqnQfu*~77s3Uzf
ze@KJr1w2Hv>E*nfN*!ByKlM0n)7Fga*5FF$y(me!VwVojrODIpLa3S&R)b22;TbQ6
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zk21lbT|?a2Y_Izv#JCl9y@_(7px#fN&N6%MPm``S=^E0Vix-`o7D7{IJuS1MF%?Cl
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zMa|$?JBMROOtEQv5IH|6rVnF<M3b3VK~t{$_>#yja*Qh}H`B39`6dS(kyf%-QDpnZ
zTQ%ZU-tZ@$K$J1V0PW9Awe)_Kho*$2@;r5CIxH6r1}BVrq1%~Rl>s<F6CRL5NP05}
zOl$vJm~WPhS4x>wWJo5cgyqFxV#O*8&8u|N@~nmY6P0GIYpsUP6BdnW5H%(k?$^N?
z-y4TMT|;-Lt<K+7s`e2Vb}kQ^wm^dw>vp+DubL24yZ@^^6E>}7R^F~DD1ae!&CsDV
z&W~R#)7N9?kC*f5myx%+Hu$XB?-DkCo)F@C6k|6gg?I+c{UXE+&;v}4W^5Q(2wXBH
z#5Uk0d>Vl3U~(F`$LDsx<{8z}SxK-RkJ@CJ8?`xp-h9R!pg!OX^C+jl#a~f5Vjk^9
ztRoGvi>@L*pdrM18biE9v4t+)>&q#evZiG_r6*$z2C!Y2%Fb+TC%H??(za(9^st%j
sGP75G-6h2wf6O5zpP!{)il0x>t<tx=ntI9(@W&LZcJfue9(C062X+0n=>Px#


From e0ec559d5998b75685d75ab581a10646aac9bbfd Mon Sep 17 00:00:00 2001
From: Gideon Bature <infoaboutgideon@gmail.com>
Date: Wed, 26 Jul 2023 03:59:01 +0100
Subject: [PATCH 6/6] remove return statement from env_cmd

---
 main.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/main.c b/main.c
index fd2a55e..4eeb0b7 100644
--- a/main.c
+++ b/main.c
@@ -228,7 +228,6 @@ void env_cmd(void)
 		printf("%s\n", environ[i]);
 		i++;
 	}
-	return;
 }
 
 /**