added pipe support

main.c

@@ -5,6 +5,41 @@
 #include<string.h>
 #include<readline/readline.h>
 #include<readline/history.h>
+int seperatePipe(char **args) {
+  for(int i = 0; args[i] != NULL; i++) {
+    if (strcmp(args[i], "|") == 0) return i;
+  }
+  return -1;
+  }
+void executePipe(char **args, int pipeIndex) {
+  args[pipeIndex] = NULL;
+  char **cmd1 = args;
+  char **cmd2 = args + pipeIndex + 1;
+  int fd[2];
+  pipe(fd);
+  pid_t pid1 = fork();
+  if (pid1 == 0) {
+    dup2(fd[1], STDOUT_FILENO);
+    close(fd[0]);
+    close(fd[1]);
+    execvp(cmd1[0], cmd1);
+    perror("tinysh");
+    exit(1);
+  }
+  pid_t pid2 = fork();
+  if (pid2 == 0) {
+    dup2(fd[0], STDIN_FILENO);
+    close(fd[0]);
+    close(fd[1]);
+    execvp(cmd2[0], cmd2);
+    perror("tinysh");
+    exit(1);
+  }
+  close(fd[0]);
+  close(fd[1]);
+  if (pid1 > 0) wait(NULL);
+  if(pid2 > 0) wait(NULL);
+}
 int handleBuiltins(char **args) {
   if(strcmp(args[0], "cd") == 0) {
     chdir(args[1] == NULL ? getenv("HOME") : args[1]);
@@ -41,6 +76,13 @@ int main() {
 		char **parsed = parse(line);
 		if(parsed[0] == NULL) { free(parsed); free(line); continue; }
 		if(handleBuiltins(parsed)) { free(line); free(parsed); continue; }
+		int pipeIndex = seperatePipe(parsed);
+		if (pipeIndex != -1) { 
+		  executePipe(parsed, pipeIndex);
+		  free(line);
+		  free(parsed);
+		  continue;
+		}
 		pid_t pid = fork();
 		if(pid == 0) {
 		  if(execvp(parsed[0], parsed) == -1 ) {