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hush: simplify parse_stream

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function                                             old     new   delta
parse_and_run_stream                                 292     289      -3
parse_stream                                        1218    1204     -14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-17)             Total: -17 bytes
This commit is contained in:
Denis Vlasenko 2009-04-03 03:45:05 +00:00
parent 3718168b87
commit 240c255d8b
1 changed files with 23 additions and 25 deletions
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48
shell/hush.c
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@ -3717,7 +3717,7 @@ static int redirect_opt_num(o_string *o)
} }
static int parse_stream(o_string *dest, struct parse_context *ctx, static int parse_stream(o_string *dest, struct parse_context *ctx,
struct in_str *input0, const char *end_trigger); struct in_str *input0, int end_trigger);
#if ENABLE_HUSH_TICK #if ENABLE_HUSH_TICK
static FILE *generate_stream_from_list(struct pipe *head) static FILE *generate_stream_from_list(struct pipe *head)
@ -3773,7 +3773,7 @@ static int process_command_subs(o_string *dest,
struct in_str pipe_str; struct in_str pipe_str;
/* Recursion to generate command */ /* Recursion to generate command */
retcode = parse_stream(&result, &inner, input, NULL); retcode = parse_stream(&result, &inner, input, '\0');
if (retcode != 0) if (retcode != 0)
return retcode; /* syntax error or EOF */ return retcode; /* syntax error or EOF */
o_free(&result); o_free(&result);
@ -3818,7 +3818,7 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
* Typically it's empty, but for function defs, * Typically it's empty, but for function defs,
* it contains function name (without '()'). */ * it contains function name (without '()'). */
int rcode; int rcode;
const char *endch; int endch;
struct parse_context sub; struct parse_context sub;
struct command *command = ctx->command; struct command *command = ctx->command;
@ -3840,9 +3840,9 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
debug_printf_parse("parse_group return 1: syntax error, groups and arglists don't mix\n"); debug_printf_parse("parse_group return 1: syntax error, groups and arglists don't mix\n");
return 1; return 1;
} }
endch = "}"; endch = '}';
if (ch == '(') { if (ch == '(') {
endch = ")"; endch = ')';
command->grp_type = GRP_SUBSHELL; command->grp_type = GRP_SUBSHELL;
} }
rcode = parse_stream(dest, &sub, input, endch); rcode = parse_stream(dest, &sub, input, endch);
@ -4220,7 +4220,7 @@ static int parse_stream_dquoted(o_string *dest, struct in_str *input, int dquote
* Net result is a list of pipes in ctx->list_head. * Net result is a list of pipes in ctx->list_head.
*/ */
static int parse_stream(o_string *dest, struct parse_context *ctx, static int parse_stream(o_string *dest, struct parse_context *ctx,
struct in_str *input, const char *end_trigger) struct in_str *input, int end_trigger)
{ {
int ch, m; int ch, m;
int redir_fd; int redir_fd;
@ -4232,8 +4232,9 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
* A single-quote triggers a bypass of the main loop until its mate is * A single-quote triggers a bypass of the main loop until its mate is
* found. When recursing, quote state is passed in via dest->o_escape. */ * found. When recursing, quote state is passed in via dest->o_escape. */
debug_printf_parse("parse_stream entered, end_trigger='%s' " debug_printf_parse("parse_stream entered, end_trigger='%c' "
"dest->o_assignment:%d\n", end_trigger, dest->o_assignment); "dest->o_assignment:%d\n", end_trigger ? : 'X'
, dest->o_assignment);
dest->o_assignment = MAYBE_ASSIGNMENT; dest->o_assignment = MAYBE_ASSIGNMENT;
initialize_context(ctx); initialize_context(ctx);
@ -4267,7 +4268,9 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
} }
continue; continue;
} }
/* m is SPECIAL ($,`), IFS, or ORDINARY_IF_QUOTED (*,#) */ /* m is SPECIAL ($,`), IFS, or ORDINARY_IF_QUOTED (*,#) */
if (m == CHAR_IFS) { if (m == CHAR_IFS) {
if (ch == EOF) if (ch == EOF)
goto ret_EOF; goto ret_EOF;
@ -4285,29 +4288,25 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
continue; continue;
} }
#endif #endif
/* Treat newline as a command separator. /* Treat newline as a command separator. */
* [why don't we handle it exactly like ';'? --vda] */
done_pipe(ctx, PIPE_SEQ); done_pipe(ctx, PIPE_SEQ);
dest->o_assignment = MAYBE_ASSIGNMENT; dest->o_assignment = MAYBE_ASSIGNMENT;
ch = ';';
/* note: if (m == CHAR_IFS) continue;
* will still trigger for us */
} }
} }
if (end_trigger && strchr(end_trigger, ch)) { if (end_trigger && end_trigger == ch) {
/* Special case: (...word) makes last word terminate, //TODO: disallow "{ cmd }" without semicolon
* as if ';' is seen */ done_word(dest, ctx);
if (ch == ')') { done_pipe(ctx, PIPE_SEQ);
done_word(dest, ctx); dest->o_assignment = MAYBE_ASSIGNMENT;
//err chk? /* Do we sit outside of any if's, loops or case's? */
done_pipe(ctx, PIPE_SEQ);
dest->o_assignment = MAYBE_ASSIGNMENT;
}
/* What do we check here? */
if (!HAS_KEYWORDS if (!HAS_KEYWORDS
IF_HAS_KEYWORDS(|| (ctx->ctx_res_w == RES_NONE && ctx->old_flag == 0)) IF_HAS_KEYWORDS(|| (ctx->ctx_res_w == RES_NONE && ctx->old_flag == 0))
) { ) {
debug_printf_parse("parse_stream return 0: end_trigger char found\n"); debug_printf_parse("parse_stream return 0: end_trigger char found\n");
/* this makes us return 0, not -1 */ return 0;
end_trigger = NULL;
goto ret;
} }
} }
if (m == CHAR_IFS) if (m == CHAR_IFS)
@ -4531,7 +4530,6 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
/* Non-error returns */ /* Non-error returns */
ret_EOF: ret_EOF:
debug_printf_parse("parse_stream return %d\n", -(end_trigger != NULL)); debug_printf_parse("parse_stream return %d\n", -(end_trigger != NULL));
ret:
done_word(dest, ctx); done_word(dest, ctx);
done_pipe(ctx, PIPE_SEQ); done_pipe(ctx, PIPE_SEQ);
if (end_trigger) { if (end_trigger) {
@ -4584,7 +4582,7 @@ static int parse_and_run_stream(struct in_str *inp, int parse_flag)
* Example: "sleep 9999; echo TEST" + ctrl-C: * Example: "sleep 9999; echo TEST" + ctrl-C:
* TEST should be printed */ * TEST should be printed */
temp.o_assignment = MAYBE_ASSIGNMENT; temp.o_assignment = MAYBE_ASSIGNMENT;
rcode = parse_stream(&temp, &ctx, inp, ";\n"); rcode = parse_stream(&temp, &ctx, inp, ';');
debug_printf_parse("rcode %d ctx.old_flag %x\n", rcode, ctx.old_flag); debug_printf_parse("rcode %d ctx.old_flag %x\n", rcode, ctx.old_flag);
#if HAS_KEYWORDS #if HAS_KEYWORDS
if (rcode != 1 && ctx.old_flag != 0) { if (rcode != 1 && ctx.old_flag != 0) {