fix: check input boundary

hw4/src/jobs.c

@@ -224,6 +224,9 @@ int jobs_show(FILE *file) {
  * value returned is the job ID assigned to the pipeline.
  */
 int jobs_run(PIPELINE *pline) {
+    if (!pline)
+        return -1;
+    
     pline = copy_pipeline(pline);
     // return -1 if no place for new job
     if (job_current_size + 1 >= MAX_JOBS)
@@ -423,6 +426,8 @@ char **jobs_get_args(ARG *args) {
  * or -1 if any error occurs that makes it impossible to wait for the specified job.
  */
 int jobs_wait(int jobid) {
+    if (jobid >= MAX_JOBS || jobid < 0)
+        return -1;
     if (!job_data_array[jobid])
         return -1;
     if (job_data_array[jobid]->status == COMPLETED ||
@@ -458,6 +463,8 @@ int jobs_wait(int jobid) {
  * has terminated, or -1 if the job has not yet terminated or if any other error occurs.
  */
 int jobs_poll(int jobid) {
+    if (jobid >= MAX_JOBS || jobid < 0)
+        return -1;
     if (!job_data_array[jobid])
         return -1;
     if (job_data_array[jobid]->status != COMPLETED &&
@@ -481,6 +488,8 @@ int jobs_poll(int jobid) {
  * @return  0 if the job was successfully expunged, -1 if the job could not be expunged.
  */
 int jobs_expunge(int jobid) {
+    if (jobid >= MAX_JOBS || jobid < 0)
+        return -1;
     if (!job_data_array[jobid])
         return -1;
     if (job_data_array[jobid]->status != COMPLETED &&
@@ -523,6 +532,8 @@ int jobs_expunge(int jobid) {
  * error occurred.
  */
 int jobs_cancel(int jobid) {
+    if (jobid >= MAX_JOBS || jobid < 0)
+        return -1;
     if (!job_data_array[jobid])
         return -1;
     if (job_data_array[jobid]->status == COMPLETED ||
@@ -554,6 +565,8 @@ int jobs_cancel(int jobid) {
  * output available, otherwise NULL.
  */
 char *jobs_get_output(int jobid) {
+    if (jobid >= MAX_JOBS || jobid < 0)
+        return NULL;
     if (!job_data_array[jobid])
         return NULL;
     if (job_data_array[jobid]->status != COMPLETED &&

hw4/src/store.c

@@ -30,6 +30,8 @@
  * otherwise NULL.
  */
 char *store_get_string(char *var) {
+    if (!var)
+        return -1;
     store_data *data = store_get_data(var);
     if (data)
         return data->value;
@@ -50,6 +52,8 @@ char *store_get_string(char *var) {
  * otherwise 0 is returned.
  */
 int store_get_int(char *var, long *valp) {
+    if (!var || !valp)
+        return -1;
     store_data *data = store_get_data(var);
     if (data) {
         // is NULL
@@ -91,6 +95,9 @@ int store_get_int(char *var, long *valp) {
  * un-set.
  */
 int store_set_string(char *var, char *val) {
+    if (!var)
+        return -1;
+    
     store_data* data = store_get_data(var);
     // if want to unset a value that does not exist
     if (!data && !val)
@@ -133,6 +140,8 @@ int store_set_string(char *var, char *val) {
  * @param  val  The value to set.
  */
 int store_set_int(char *var, long val) {
+    if (!var)
+        return -1;
     // if val is 0, set var to 0
     if (val == 0)
         return store_set_string(var, "0");