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WEEK-5/dshlib.c

+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "dshlib.h"
+
+
+int build_cmd_list(char *cmd_line, command_list_t *clist)
+{
+    if (strlen(cmd_line) == 0)
+    {
+        return WARN_NO_CMDS; // Empty input
+    }
+
+    // Initialize command list
+    clist->num = 0;
+    memset(clist->commands, 0, sizeof(clist->commands));
+
+    char *saveptr; // For strtok_r (reentrant version of strtok)
+    char *token = strtok_r(cmd_line, PIPE_STRING, &saveptr);
+
+    while (token != NULL)
+    {
+        if (clist->num >= CMD_MAX)
+        {
+            return ERR_TOO_MANY_COMMANDS; // Too many commands
+        }
+
+        // Trim leading spaces
+        while (isspace((unsigned char)*token))
+            token++;
+
+        // Trim trailing spaces
+        char *end = token + strlen(token) - 1;
+        while (end > token && isspace((unsigned char)*end))
+            end--;
+        *(end + 1) = '\0';
+
+        // Extract command and arguments separately
+        char *cmd_name = strtok(token, " ");  // First word is the command
+        char *cmd_args = strtok(NULL, "");    // Rest are arguments
+
+        if (cmd_name != NULL)
+        {
+            strncpy(clist->commands[clist->num].exe, cmd_name, EXE_MAX - 1);
+            if (cmd_args != NULL)
+            {
+                strncpy(clist->commands[clist->num].args, cmd_args, ARG_MAX - 1);
+            }
+            clist->num++;
+        }
+
+        token = strtok_r(NULL, PIPE_STRING, &saveptr);  // Move to next command
+    }
+
+    return OK;
+}