lab5: 支持参数补全

lab5/user/lab5/apps/init.c

@@ -26,6 +26,9 @@ int fs_server_cap;
 #define MAX_FILE_COMPLEMENT_WORD 100
 #define MAX_FILENAME_LEN 255
 
+#define FTYPE_FILE 0b01
+#define FTYPE_DIR  0b10
+
 static char *builtin_complement_word[] = {"cd", "ls", "ll", "cat", "echo", "clear"};
 static int n_builtin_complement_word = sizeof(builtin_complement_word) / sizeof(char *);
 
@@ -34,13 +37,14 @@ static char file_complement_buf[MAX_FILE_COMPLEMENT_WORD * (MAX_FILENAME_LEN + 1
 void path_to_absolute(char *path);
 int fs_scan(char *path);
 
-static int make_file_complement_word(char ***ret_words) {
+static int make_file_complement_word(char ***ret_words, char *path_prefix, u8 type_mask) {
     int n = 0;
     static char *words[MAX_FILE_COMPLEMENT_WORD];
     char *buf = file_complement_buf;
     char pathbuf[BUFLEN];
 
     // 当前目录
+    // TODO: 支持更深路径的文件补全，如输入 tar 生成 tar/init.bin 等等
     pathbuf[0] = '\0';
     path_to_absolute(pathbuf);
     // 列出目录文件
@@ -52,13 +56,15 @@ static int make_file_complement_word(char ***ret_words) {
 
         for (int i = 0; i < ret; i++) {
             dirat = (struct dirent *) print_ptr;
-            // 加入结果
+            if ((dirat->d_type & type_mask) != 0) {
+                // 类型符合，加入结果
                 words[n++] = buf;
                 strcpy(buf, dirat->d_name);
                 buf += MAX_FILENAME_LEN + 1;
                 if (n >= MAX_FILE_COMPLEMENT_WORD) {
                     break;
                 }
+            }
             print_ptr += dirat->d_reclen;
         }
     }
@@ -67,7 +73,11 @@ static int make_file_complement_word(char ***ret_words) {
     return n;
 }
 
-static char *match_complement_words(char **words, size_t n, char *complement, size_t len, int complement_time, int *match_count) {
+/**
+ * 在传入的匹配词中匹配补全
+ */
+static char *match_complement_words(char **words, size_t n, char *complement, int complement_time, int *match_count) {
+    size_t len = strlen(complement);
     for (int i = 0; i < n; i++) {
         // 前缀匹配
         if (strncmp(complement, words[i], len) != 0)
@@ -80,24 +90,64 @@ static char *match_complement_words(char **words, size_t n, char *complement, si
     return NULL;
 }
 
+/**
+ * 匹配内建指令的参数
+ */
+static char *match_builtin_command_param(char *complement, int complement_time, int *match_count) {
+    u8 type_mask;
+    int start_pos;
+    char *matched = NULL;
+    char **words;
+    int n_words;
+    static char buf[BUFLEN];
+    // 指令分类
+    if (!strncmp(complement, "cd", 2) || !strncmp(complement, "ls", 2) || !strncmp(complement, "ll", 2)) {
+        type_mask = FTYPE_DIR;
+        start_pos = 2;
+    } else if (!strncmp(complement, "cat", 3)) {
+        type_mask = FTYPE_FILE;
+        start_pos = 3;
+    } else {
+        // 不支持的指令
+        return NULL;
+    }
+    // 跳过空格
+    while (complement[start_pos] == ' ')
+        start_pos++;
+    // 匹配文件
+    n_words = make_file_complement_word(&words, complement + start_pos, type_mask);
+    matched = match_complement_words(words, n_words, complement + start_pos, complement_time, match_count);
+    if (matched) {
+        // 如果匹配到，就进行拼接
+        memcpy(buf, complement, start_pos);
+        strcpy(buf + start_pos, matched);
+        return buf;
+    }
+    return NULL;
+}
+
 static int do_complement(char *buf, char *complement, int complement_time)
 {
 	int r = -1;
     int match_count = 0;
-    size_t len = strlen(complement);
 	char *matched = NULL;
     char **words;
     int n_words;
 
     // 匹配文件
-    n_words = make_file_complement_word(&words);
-    matched = match_complement_words(words, n_words, complement, len, complement_time, &match_count);
+    n_words = make_file_complement_word(&words, complement, FTYPE_FILE);
+    matched = match_complement_words(words, n_words, complement, complement_time, &match_count);
 
     // 匹配 Shell 内建指令
     if (!matched) {
         words = builtin_complement_word;
         n_words = n_builtin_complement_word;
-        matched = match_complement_words(words, n_words, complement, len, complement_time, &match_count);
+        matched = match_complement_words(words, n_words, complement, complement_time, &match_count);
+    }
+
+    // 匹配 Shell 内建指令的参数
+    if (!matched) {
+        matched = match_builtin_command_param(complement, complement_time, &match_count);
     }
 
     // 匹配结果