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WEEK-7/dshlib.h

+#ifndef DSHLIB_H
+#define DSHLIB_H
+
+#include <stdbool.h>
+
+#define SH_CMD_MAX 512    // Max length of a command line
+#define CMD_MAX 10        // Max number of piped commands
+#define CMD_ARG_MAX 20    // Max arguments per command
+#define OK 0
+#define OK_EXIT -1
+#define ERR_TOO_MANY_COMMANDS -2
+#define ERR_MEMORY -3
+#define ERR_EXEC_CMD -4
+#define WARN_NO_CMDS -5
+#define CMD_WARN_NO_CMD "Warning: No command entered.\n"
+#define CMD_ERR_PIPE_LIMIT "Error: Too many commands. Max is %d.\n"
+#define EXIT_CMD "exit"
+#define SH_PROMPT "dsh3> "
+
+/**
+ * Structure to store a single command with arguments.
+ */
+typedef struct {
+    char *_cmd_buffer;   // The full command string
+    char *argv[CMD_ARG_MAX]; // Array of command arguments
+    char *infile;        // Input redirection file (for `<`)
+    char *outfile;       // Output redirection file (for `>` and `>>`)
+    bool append;         // True if `>>` (append mode), false if `>` (overwrite mode)
+} cmd_buff_t;
+
+/**
+ * Structure to store a list of commands, e.g., for pipelines.
+ */
+typedef struct {
+    cmd_buff_t commands[CMD_MAX]; // Array of commands
+    int num; // Number of commands in the pipeline
+} command_list_t;
+
+// Function Declarations
+int exec_local_cmd_loop();
+int build_cmd_list(char *cmd_line, command_list_t *clist);
+int execute_pipeline(command_list_t *clist);
+int free_cmd_list(command_list_t *cmd_lst);
+
+#endif // DSHLIB_H