hush: support "f() (cmd)" functions

Many other shells support this construct

function                                             old     new   delta
parse_stream                                        2950    3018     +68

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 50 insertions, 29 deletions

diff --git a/shell/hush.c b/shell/hush.c
index 94e429c0d..335107283 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -4297,6 +4297,11 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
         /* dest contains characters seen prior to ( or {.
          * Typically it's empty, but for function defs,
          * it contains function name (without '()'). */
+#if BB_MMU
+# define as_string NULL
+#else
+        char *as_string = NULL;
+#endif
         struct pipe *pipe_list;
         int endch;
         struct command *command = ctx->command;
@@ -4325,7 +4330,7 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
                 do
                         ch = i_getch(input);
                 while (ch == ' ' || ch == '\t' || ch == '\n');
-                if (ch != '{') {
+                if (ch != '{' && ch != '(') {
                         syntax_error_unexpected_ch(ch);
                         return 1;
                 }
@@ -4347,13 +4352,13 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
         }
 #endif
 
-#if ENABLE_HUSH_FUNCTIONS
- skip:
-#endif
+ IF_HUSH_FUNCTIONS(skip:)
+
         endch = '}';
         if (ch == '(') {
                 endch = ')';
-                command->cmd_type = CMD_SUBSHELL;
+                IF_HUSH_FUNCTIONS(if (command->cmd_type != CMD_FUNCDEF))
+                        command->cmd_type = CMD_SUBSHELL;
         } else {
                 /* bash does not allow "{echo...", requires whitespace */
                 ch = i_peek(input);
@@ -4369,38 +4374,54 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
                 }
         }
 
-        {
-#if BB_MMU
-# define as_string NULL
-#else
-                char *as_string = NULL;
-#endif
-                pipe_list = parse_stream(&as_string, input, endch);
+        pipe_list = parse_stream(&as_string, input, endch);
 #if !BB_MMU
-                if (as_string)
-                        o_addstr(&ctx->as_string, as_string);
+        if (as_string)
+                o_addstr(&ctx->as_string, as_string);
 #endif
-                /* empty ()/{} or parse error? */
-                if (!pipe_list || pipe_list == ERR_PTR) {
-                        /* parse_stream already emitted error msg */
-                        if (!BB_MMU)
-                                free(as_string);
-                        debug_printf_parse("parse_group return 1: "
-                                "parse_stream returned %p\n", pipe_list);
-                        return 1;
-                }
-                command->group = pipe_list;
+
+        /* empty ()/{} or parse error? */
+        if (!pipe_list || pipe_list == ERR_PTR) {
+                /* parse_stream already emitted error msg */
+                if (!BB_MMU)
+                        free(as_string);
+                debug_printf_parse("parse_group return 1: "
+                        "parse_stream returned %p\n", pipe_list);
+                return 1;
+        }
 #if !BB_MMU
-                as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
-                command->group_as_string = as_string;
-                debug_printf_parse("end of group, remembering as:'%s'\n",
-                                command->group_as_string);
+        as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
+        command->group_as_string = as_string;
+        debug_printf_parse("end of group, remembering as:'%s'\n",
+                        command->group_as_string);
 #endif
-#undef as_string
+
+#if ENABLE_HUSH_FUNCTIONS
+        /* Convert "f() (cmds)" to "f() {(cmds)}" */
+        if (command->cmd_type == CMD_FUNCDEF && endch == ')') {
+                struct command *cmd2;
+
+                cmd2 = xzalloc(sizeof(*cmd2));
+                cmd2->cmd_type = CMD_SUBSHELL;
+                cmd2->group = pipe_list;
+# if !BB_MMU
+//UNTESTED!
+                cmd2->group_as_string = command->group_as_string;
+                command->group_as_string = xasprintf("(%s)", command->group_as_string);
+# endif
+
+                pipe_list = new_pipe();
+                pipe_list->cmds = cmd2;
+                pipe_list->num_cmds = 1;
         }
+#endif
+
+        command->group = pipe_list;
+
         debug_printf_parse("parse_group return 0\n");
         return 0;
         /* command remains "open", available for possible redirects */
+#undef as_string
 }
 
 #if ENABLE_HUSH_TICK || ENABLE_FEATURE_SH_MATH || ENABLE_HUSH_DOLLAR_OPS