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https://github.com/sheumann/hush.git
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hush: next small step towards functions
This commit is contained in:
Denis Vlasenko
parent
ded6ad34ed
commit
371de4acf7
72
shell/hush.c
72
shell/hush.c
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@ -96,6 +96,12 @@
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#endif
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/* Keep unconditionally on for now */
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#define HUSH_DEBUG 1
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/* In progress... */
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#define ENABLE_HUSH_FUNCTIONS 0
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/* If you comment out one of these below, it will be #defined later
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* to perform debug printfs to stderr: */
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#define debug_printf(...) do {} while (0)
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@ -218,8 +224,6 @@ void xxfree(void *ptr)
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#endif
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/* Keep unconditionally on for now */
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#define HUSH_DEBUG 1
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/* Do we support ANY keywords? */
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#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
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#define HAS_KEYWORDS 1
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@ -307,7 +311,7 @@ struct command {
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pid_t pid; /* 0 if exited */
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int assignment_cnt; /* how many argv[i] are assignments? */
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smallint is_stopped; /* is the command currently running? */
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smallint subshell; /* flag, non-zero if group must be forked */
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smallint grp_type;
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struct pipe *group; /* if non-NULL, this "prog" is {} group,
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* subshell, or a compound statement */
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char **argv; /* command name and arguments */
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@ -319,6 +323,11 @@ struct command {
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* Example: argv[0]=='.^C*^C.' here: echo .$*.
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* References of the form ^C`cmd arg^C are `cmd arg` substitutions.
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*/
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#define GRP_NORMAL 0
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#define GRP_SUBSHELL 1
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#if ENABLE_HUSH_FUNCTIONS
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#define GRP_FUNCTION 2
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#endif
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struct pipe {
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struct pipe *next;
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@ -1016,12 +1025,14 @@ static void o_addstr_duplicate_backslash(o_string *o, const char *str, int len)
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static void o_addqchr(o_string *o, int ch)
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{
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int sz = 1;
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if (strchr("*?[\\", ch)) {
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char *found = strchr("*?[\\", ch);
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if (found)
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sz++;
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o_grow_by(o, sz);
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if (found) {
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o->data[o->length] = '\\';
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o->length++;
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}
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o_grow_by(o, sz);
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o->data[o->length] = ch;
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o->length++;
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o->data[o->length] = '\0';
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@ -1834,7 +1845,15 @@ static int run_pipe(struct pipe *pi)
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*/
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command = &(pi->cmds[0]);
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if (single_and_fg && command->group && command->subshell == 0) {
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#if ENABLE_HUSH_FUNCTIONS
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if (single_and_fg && command->group && command->grp_type == GRP_FUNCTION) {
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/* We "execute" function definition */
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bb_error_msg("here we ought to remember function definition, and go on");
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return EXIT_SUCCESS;
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}
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#endif
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if (single_and_fg && command->group && command->grp_type == GRP_NORMAL) {
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debug_printf("non-subshell grouping\n");
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setup_redirects(command, squirrel);
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debug_printf_exec(": run_list\n");
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@ -2023,7 +2042,7 @@ static int run_pipe(struct pipe *pi)
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#ifndef debug_print_tree
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static void debug_print_tree(struct pipe *pi, int lvl)
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{
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static const char *PIPE[] = {
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static const char *const PIPE[] = {
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[PIPE_SEQ] = "SEQ",
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[PIPE_AND] = "AND",
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[PIPE_OR ] = "OR" ,
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@ -2057,6 +2076,13 @@ static void debug_print_tree(struct pipe *pi, int lvl)
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[RES_XXXX ] = "XXXX" ,
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[RES_SNTX ] = "SNTX" ,
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};
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static const char *const GRPTYPE[] = {
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"()",
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"{}",
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#if ENABLE_HUSH_FUNCTIONS
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"func()",
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#endif
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};
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int pin, prn;
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@ -2072,7 +2098,7 @@ static void debug_print_tree(struct pipe *pi, int lvl)
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fprintf(stderr, "%*s prog %d assignment_cnt:%d", lvl*2, "", prn, command->assignment_cnt);
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if (command->group) {
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fprintf(stderr, " group %s: (argv=%p)\n",
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(command->subshell ? "()" : "{}"),
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GRPTYPE[command->grp_type],
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argv);
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debug_print_tree(command->group, lvl+1);
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prn++;
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@ -2443,7 +2469,7 @@ static int free_pipe(struct pipe *pi, int indent)
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free_strings(command->argv);
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command->argv = NULL;
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} else if (command->group) {
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debug_printf_clean("%s begin group (subshell:%d)\n", indenter(indent), command->subshell);
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debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type);
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ret_code = free_pipe_list(command->group, indent+3);
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debug_printf_clean("%s end group\n", indenter(indent));
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} else {
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@ -2572,7 +2598,6 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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#if ENABLE_HUSH_TICK
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o_string subst_result = NULL_O_STRING;
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#endif
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o_addstr(output, arg, p - arg);
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debug_print_list("expand_vars_to_list[1]", output, n);
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arg = ++p;
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@ -3100,7 +3125,7 @@ static int reserved_word(o_string *word, struct parse_context *ctx)
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done_pipe(ctx, PIPE_SEQ);
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old = ctx->stack;
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old->command->group = ctx->list_head;
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old->command->subshell = 0;
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old->command->grp_type = GRP_NORMAL;
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*ctx = *old; /* physical copy */
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free(old);
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}
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@ -3461,15 +3486,24 @@ static int process_command_subs(o_string *dest,
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static int parse_group(o_string *dest, struct parse_context *ctx,
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struct in_str *input, int ch)
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{
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/* NB: parse_group may create and use its own o_string,
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* without any code changes. It just so happens that code is smaller
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* if we (ab)use caller's one. */
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/* dest contains characters seen prior to ( or {.
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* Typically it's empty, but for functions defs,
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* it contains function name (without '()'). */
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int rcode;
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const char *endch = NULL;
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struct parse_context sub;
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struct command *command = ctx->command;
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debug_printf_parse("parse_group entered\n");
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#if ENABLE_HUSH_FUNCTIONS
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if (ch == 'F') { /* function definition? */
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bb_error_msg("aha '%s' is a function, parsing it...", dest->data);
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//command->fname = dest->data;
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command->grp_type = GRP_FUNCTION;
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//TODO: review every o_reset() location... do they handle all o_string fields correctly?
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memset(dest, 0, sizeof(*dest));
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}
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#endif
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if (command->argv /* word [word](... */
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|| dest->length /* word(... */
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|| dest->nonnull /* ""(... */
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@ -3482,11 +3516,8 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
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endch = "}";
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if (ch == '(') {
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endch = ")";
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command->subshell = 1;
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command->grp_type = GRP_SUBSHELL;
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}
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//TODO if (ch == 'F') { /* function definition */
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// command->subshell = 2;
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// }
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rcode = parse_stream(dest, &sub, input, endch);
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if (rcode == 0) {
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done_word(dest, &sub); /* finish off the final word in the subcontext */
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@ -3988,16 +4019,18 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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continue;
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}
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#endif
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#if 0 /* TODO: implement functions */
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#if ENABLE_HUSH_FUNCTIONS
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if (dest->length != 0 /* not just () but word() */
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&& dest->nonnull == 0 /* not a"b"c() */
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&& ctx->command->argv == NULL /* it's the first word */
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//TODO: "func ( ) {...}" - note spaces - is valid format too in bash
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&& i_peek(input) == ')'
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&& !match_reserved_word(dest)
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) {
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bb_error_msg("seems like a function definition");
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i_getch(input);
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do {
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//TODO: do it properly.
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ch = i_getch(input);
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} while (ch == ' ' || ch == '\n');
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if (ch != '{') {
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@ -4005,6 +4038,7 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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debug_printf_parse("parse_stream return 1\n");
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return 1;
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}
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ch = 'F'; /* magic value */
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}
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#endif
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case '{':
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