From dcf0bb9ce906dc0973b0a715009ccb487174f704 Mon Sep 17 00:00:00 2001
From: Ziheng Chen <zc328@dragons.drexel.edu>
Date: Mon, 3 Mar 2025 04:02:08 +0000
Subject: [PATCH] Upload New File
---
w8/dshlib.h | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 93 insertions(+)
create mode 100644 w8/dshlib.h
diff --git a/w8/dshlib.h b/w8/dshlib.h
new file mode 100644
index 0000000..0725b48
--- /dev/null
+++ b/w8/dshlib.h
@@ -0,0 +1,93 @@
+#ifndef __DSHLIB_H__
+ #define __DSHLIB_H__
+
+
+//Constants for command structure sizes
+#define EXE_MAX 64
+#define ARG_MAX 256
+#define CMD_MAX 8
+#define CMD_ARGV_MAX (CMD_MAX + 1)
+// Longest command that can be read from the shell
+#define SH_CMD_MAX EXE_MAX + ARG_MAX
+
+typedef struct command
+{
+ char exe[EXE_MAX];
+ char args[ARG_MAX];
+} command_t;
+
+#include <stdbool.h>
+
+typedef struct cmd_buff
+{
+ int argc;
+ char *argv[CMD_ARGV_MAX];
+ char *_cmd_buffer;
+ char *input_file; // extra credit, stores input redirection file (for `<`)
+ char *output_file; // extra credit, stores output redirection file (for `>`)
+ bool append_mode; // extra credit, sets append mode fomr output_file
+} cmd_buff_t;
+
+typedef struct command_list{
+ int num;
+ cmd_buff_t commands[CMD_MAX];
+}command_list_t;
+
+//Special character #defines
+#define SPACE_CHAR ' '
+#define PIPE_CHAR '|'
+#define PIPE_STRING "|"
+
+#define SH_PROMPT "dsh4> "
+#define EXIT_CMD "exit"
+#define RC_SC 99
+#define EXIT_SC 100
+
+//Standard Return Codes
+#define OK 0
+#define WARN_NO_CMDS -1
+#define ERR_TOO_MANY_COMMANDS -2
+#define ERR_CMD_OR_ARGS_TOO_BIG -3
+#define ERR_CMD_ARGS_BAD -4 //for extra credit
+#define ERR_MEMORY -5
+#define ERR_EXEC_CMD -6
+#define OK_EXIT -7
+
+
+
+//prototypes
+int alloc_cmd_buff(cmd_buff_t *cmd_buff);
+int free_cmd_buff(cmd_buff_t *cmd_buff);
+int clear_cmd_buff(cmd_buff_t *cmd_buff);
+int build_cmd_buff(char *cmd_line, cmd_buff_t *cmd_buff);
+int close_cmd_buff(cmd_buff_t *cmd_buff);
+int build_cmd_list(char *cmd_line, command_list_t *clist);
+int free_cmd_list(command_list_t *cmd_lst);
+
+//built in command stuff
+typedef enum {
+ BI_CMD_EXIT,
+ BI_CMD_DRAGON,
+ BI_CMD_CD,
+ BI_CMD_RC, //extra credit command
+ BI_CMD_STOP_SVR, //new command "stop-server"
+ BI_NOT_BI,
+ BI_EXECUTED,
+ BI_NOT_IMPLEMENTED,
+} Built_In_Cmds;
+Built_In_Cmds match_command(const char *input);
+Built_In_Cmds exec_built_in_cmd(cmd_buff_t *cmd);
+
+//main execution context
+int exec_local_cmd_loop();
+int exec_cmd(cmd_buff_t *cmd);
+int execute_pipeline(command_list_t *clist);
+
+
+//output constants
+#define CMD_OK_HEADER "PARSED COMMAND LINE - TOTAL COMMANDS %d\n"
+#define CMD_WARN_NO_CMD "warning: no commands provided\n"
+#define CMD_ERR_PIPE_LIMIT "error: piping limited to %d commands\n"
+
+
+#endif
\ No newline at end of file
--
GitLab