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hush: add case statement support. It is incomplete and disabled for now.

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costs ~300 bytes when enabled.
This commit is contained in:
Denis Vlasenko 2008-07-14 04:32:29 +00:00
parent 3177ba0852
commit 17f02e79f4
1 changed files with 146 additions and 44 deletions
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190
shell/hush.c
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@ -73,6 +73,9 @@
#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
// TEMP
#define ENABLE_HUSH_CASE 0
#if !BB_MMU && ENABLE_HUSH_TICK
//#undef ENABLE_HUSH_TICK
@ -262,22 +265,29 @@ typedef enum {
typedef enum {
RES_NONE = 0,
#if ENABLE_HUSH_IF
RES_IF = 1,
RES_THEN = 2,
RES_ELIF = 3,
RES_ELSE = 4,
RES_FI = 5,
RES_IF ,
RES_THEN ,
RES_ELIF ,
RES_ELSE ,
RES_FI ,
#endif
#if ENABLE_HUSH_LOOPS
RES_FOR = 6,
RES_WHILE = 7,
RES_UNTIL = 8,
RES_DO = 9,
RES_DONE = 10,
RES_IN = 11,
RES_FOR ,
RES_WHILE ,
RES_UNTIL ,
RES_DO ,
RES_DONE ,
RES_IN ,
#endif
RES_XXXX = 12,
RES_SNTX = 13
#if ENABLE_HUSH_CASE
RES_CASE ,
/* two pseudo-keywords support contrived "case" syntax: */
RES_MATCH , /* "word)" */
RES_CASEI , /* "this command is inside CASE" */
RES_ESAC ,
#endif
RES_XXXX ,
RES_SNTX
} reserved_style;
/* This holds pointers to the various results of parsing */
@ -289,6 +299,9 @@ struct p_context {
#if HAS_KEYWORDS
smallint ctx_res_w;
smallint ctx_inverted; /* "! cmd | cmd" */
#if ENABLE_HUSH_CASE
smallint ctx_dsemicolon; /* ";;" seen */
#endif
int old_flag; /* bitmask of FLAG_xxx, for figuring out valid reserved words */
struct p_context *stack;
#endif
@ -350,7 +363,7 @@ struct variable {
typedef struct {
char *data;
int length;
int length; /* position where data is appended */
int maxlen;
/* Misnomer! it's not "quoting", it's "protection against globbing"!
* (by prepending \ to *, ?, [ and to \ too) */
@ -1954,6 +1967,12 @@ static void debug_print_tree(struct pipe *pi, int lvl)
[RES_DO ] = "DO" ,
[RES_DONE ] = "DONE" ,
[RES_IN ] = "IN" ,
#endif
#if ENABLE_HUSH_CASE
[RES_CASE ] = "CASE" ,
[RES_MATCH] = "MATCH",
[RES_CASEI] = "CASEI",
[RES_ESAC ] = "ESAC" ,
#endif
[RES_XXXX ] = "XXXX" ,
[RES_SNTX ] = "SNTX" ,
@ -2002,6 +2021,9 @@ static int run_list(struct pipe *pi)
char **for_lcur = NULL;
char **for_list = NULL;
int flag_rep = 0;
#endif
#if ENABLE_HUSH_CASE
char *case_word = NULL;
#endif
int flag_skip = 1;
int rcode = 0; /* probably for gcc only */
@ -2019,17 +2041,20 @@ static int run_list(struct pipe *pi)
#if ENABLE_HUSH_LOOPS
/* check syntax for "for" */
for (rpipe = pi; rpipe; rpipe = rpipe->next) {
if ((rpipe->res_word == RES_IN || rpipe->res_word == RES_FOR)
&& (rpipe->next == NULL)
) {
syntax("malformed for"); /* no IN or no commands after IN */
if (rpipe->res_word != RES_FOR && rpipe->res_word != RES_IN)
continue;
/* current word is FOR or IN (BOLD in comments below) */
if (rpipe->next == NULL) {
syntax("malformed for");
debug_printf_exec("run_list lvl %d return 1\n", run_list_level);
return 1;
}
if (/* Extra statement after IN: "for a in a b; echo Hi; do ...; done" ? */
(rpipe->res_word == RES_IN && rpipe->next->res_word == RES_IN && rpipe->next->progs[0].argv != NULL)
/* FOR not followed by IN or DO ("for var; do..." case)? */
|| (rpipe->res_word == RES_FOR && (rpipe->next->res_word != RES_IN && rpipe->next->res_word != RES_DO))
/* "FOR v; do ..." and "for v IN a b; do..." are ok */
if (rpipe->next->res_word == RES_DO)
continue;
/* next word is not "do". It must be "in" then ("FOR v in ...") */
if (rpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
|| rpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
) {
syntax("malformed for");
debug_printf_exec("run_list lvl %d return 1\n", run_list_level);
@ -2136,8 +2161,8 @@ static int run_list(struct pipe *pi)
/* create list of variable values */
debug_print_strings("for_list made from", vals);
for_list = expand_strvec_to_strvec(vals);
debug_print_strings("for_list", for_list);
for_lcur = for_list;
debug_print_strings("for_list", for_list);
for_varname = pi->progs->argv[0];
pi->progs->argv[0] = NULL;
flag_rep = 1;
@ -2169,6 +2194,26 @@ static int run_list(struct pipe *pi)
}
}
#endif
#if ENABLE_HUSH_CASE
if (rword == RES_CASE) {
case_word = pi->progs->argv[0];
continue;
}
if (rword == RES_MATCH) {
if (case_word) {
next_if_code = strcmp(case_word, pi->progs->argv[0]);
if (next_if_code == 0)
case_word = NULL;
continue;
}
break;
}
if (rword == RES_CASEI) {
if (next_if_code != 0)
continue;
}
#endif
if (pi->num_progs == 0)
continue;
debug_printf_exec(": run_pipe with %d members\n", pi->num_progs);
@ -2193,8 +2238,7 @@ static int run_list(struct pipe *pi)
rcode = checkjobs_and_fg_shell(pi);
} else
#endif
{
/* this one just waits for completion */
{ /* this one just waits for completion */
rcode = checkjobs(pi);
}
debug_printf_exec(": checkjobs returned %d\n", rcode);
@ -2217,12 +2261,13 @@ static int run_list(struct pipe *pi)
skip_more_for_this_rword = rword;
}
checkjobs(NULL);
}
} /* for (pi) */
#if ENABLE_HUSH_JOB
if (ctrl_z_flag) {
/* ctrl-Z forked somewhere in the past, we are the child,
* and now we completed running the list. Exit. */
//TODO: _exit?
exit(rcode);
}
ret:
@ -2820,6 +2865,10 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
FLAG_DO = (1 << RES_DO ),
FLAG_DONE = (1 << RES_DONE ),
FLAG_IN = (1 << RES_IN ),
#endif
#if ENABLE_HUSH_CASE
FLAG_MATCH = (1 << RES_MATCH),
FLAG_ESAC = (1 << RES_ESAC ),
#endif
FLAG_START = (1 << RES_XXXX ),
};
@ -2843,16 +2892,30 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
{ "until", RES_UNTIL, FLAG_DO | FLAG_START },
{ "in", RES_IN, FLAG_DO },
{ "do", RES_DO, FLAG_DONE },
{ "done", RES_DONE, FLAG_END }
{ "done", RES_DONE, FLAG_END },
#endif
#if ENABLE_HUSH_CASE
{ "case", RES_CASE, FLAG_MATCH | FLAG_START },
{ "esac", RES_ESAC, FLAG_END },
#endif
};
#if ENABLE_HUSH_CASE
static const struct reserved_combo reserved_match = {
"" /* "match" */, RES_MATCH, FLAG_MATCH | FLAG_ESAC
};
#endif
const struct reserved_combo *r;
for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
if (strcmp(word->data, r->literal) != 0)
continue;
debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
#if ENABLE_HUSH_CASE
if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE)
/* "case word IN ..." - IN part starts first match part */
r = &reserved_match;
else
#endif
if (r->flag == 0) { /* '!' */
if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
syntax(NULL);
@ -2864,13 +2927,6 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
if (r->flag & FLAG_START) {
struct p_context *new;
debug_printf("push stack\n");
#if ENABLE_HUSH_LOOPS
if (ctx->ctx_res_w == RES_IN || ctx->ctx_res_w == RES_FOR) {
syntax("malformed for"); /* example: 'for if' */
ctx->ctx_res_w = RES_SNTX;
return 1;
}
#endif
new = xmalloc(sizeof(*new));
*new = *ctx; /* physical copy */
initialize_context(ctx);
@ -2924,12 +2980,20 @@ static int done_word(o_string *word, struct p_context *ctx)
word->o_assignment = NOT_ASSIGNMENT;
debug_printf("word stored in rd_filename: '%s'\n", word->data);
} else {
if (child->group) { /* TODO: example how to trigger? */
syntax(NULL);
debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n");
return 1;
}
// if (child->group) { /* TODO: example how to trigger? */
// syntax(NULL);
// debug_printf_parse("done_word return 1: syntax error, groups and arglists don't mix\n");
// return 1;
// }
#if HAS_KEYWORDS
#if ENABLE_HUSH_CASE
if (ctx->ctx_dsemicolon) {
/* already done when ctx_dsemicolon was set to 1 */
/* ctx->ctx_res_w = RES_MATCH; */
ctx->ctx_dsemicolon = 0;
} else
#endif
if (!child->argv /* if it's the first word... */
#if ENABLE_HUSH_LOOPS
&& ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
@ -2983,6 +3047,12 @@ static int done_word(o_string *word, struct p_context *ctx)
//TODO: check that child->argv[0] is a valid variable name!
done_pipe(ctx, PIPE_SEQ);
}
#endif
#if ENABLE_HUSH_CASE
/* Force CASE to have just one word */
if (ctx->ctx_res_w == RES_CASE) {
done_pipe(ctx, PIPE_SEQ);
}
#endif
debug_printf_parse("done_word return 0\n");
return 0;
@ -3055,6 +3125,10 @@ static void done_pipe(struct p_context *ctx, pipe_style type)
if (ctx->ctx_res_w == RES_FOR
|| ctx->ctx_res_w == RES_IN)
ctx->ctx_res_w = RES_NONE;
#endif
#if ENABLE_HUSH_CASE
if (ctx->ctx_res_w == RES_MATCH)
ctx->ctx_res_w = RES_CASEI;
#endif
/* Create the memory for child, roughly:
* ctx->pipe->progs = new struct child_prog;
@ -3458,10 +3532,9 @@ static int handle_dollar(o_string *dest, struct in_str *input)
}
/* Scan input, call done_word() whenever full IFS delimited word was seen.
* call done_pipe if '\n' was seen (and end_trigger != NULL)
* Return if (non-quoted) char in end_trigger was seen; or on parse error. */
/* Return code is 0 if end_trigger char is met,
* -1 on EOF (but if end_trigger == NULL then return 0)
* Call done_pipe if '\n' was seen (and end_trigger != NULL).
* Return code is 0 if end_trigger char is met,
* -1 on EOF (but if end_trigger == NULL then return 0),
* 1 for syntax error */
static int parse_stream(o_string *dest, struct p_context *ctx,
struct in_str *input, const char *end_trigger)
@ -3664,8 +3737,26 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
setup_redirect(ctx, redir_fd, redir_style, input);
break;
case ';':
#if ENABLE_HUSH_CASE
case_semi:
#endif
done_word(dest, ctx);
done_pipe(ctx, PIPE_SEQ);
#if ENABLE_HUSH_CASE
/* Eat multiple semicolons, detect
* whether it means something special */
while (1) {
ch = i_peek(input);
if (ch != ';')
break;
i_getch(input);
if (ctx->ctx_res_w == RES_CASEI) {
ctx->ctx_dsemicolon = 1;
ctx->ctx_res_w = RES_MATCH;
break;
}
}
#endif
break;
case '&':
done_word(dest, ctx);
@ -3689,6 +3780,13 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
}
break;
case '(':
#if ENABLE_HUSH_CASE
if (dest->length == 0 // && argv[0] == NULL
&& ctx->ctx_res_w == RES_MATCH
) {
continue;
}
#endif
case '{':
if (parse_group(dest, ctx, input, ch) != 0) {
debug_printf_parse("parse_stream return 1: parse_group returned non-0\n");
@ -3696,6 +3794,10 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
}
break;
case ')':
#if ENABLE_HUSH_CASE
if (ctx->ctx_res_w == RES_MATCH)
goto case_semi;
#endif
case '}':
/* proper use of this character is caught by end_trigger */
syntax("unexpected } or )");