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w8/dshlib.h

+#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
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