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https://github.com/sheumann/hush.git
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hush: fix bug with local environment vars in pipes; simplify parse_stream()
function old new delta parse_stream 1238 1218 -20 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-20) Total: -20 bytes
This commit is contained in:
Denis Vlasenko
parent
f9f7429346
commit
3718168b87
70
shell/hush.c
70
shell/hush.c
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@ -1657,8 +1657,7 @@ static char **o_finalize_list(o_string *o, int n)
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/* Expansion can recurse */
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#if ENABLE_HUSH_TICK
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static int process_command_subs(o_string *dest,
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struct in_str *input, const char *subst_end);
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static int process_command_subs(o_string *dest, struct in_str *input);
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#endif
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static char *expand_string_to_string(const char *str);
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static int parse_stream_dquoted(o_string *dest, struct in_str *input, int dquote_end);
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@ -1814,7 +1813,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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//TODO: can we just stuff it into "output" directly?
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debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
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setup_string_in_str(&input, arg);
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process_command_subs(&subst_result, &input, NULL);
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process_command_subs(&subst_result, &input);
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debug_printf_subst("SUBST RES '%s'\n", subst_result.data);
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val = subst_result.data;
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goto store_val;
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@ -1971,7 +1970,6 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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}
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} /* default: */
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} /* switch (char after <SPECIAL_VAR_SYMBOL>) */
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if (val) {
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o_addQstr(output, val, strlen(val));
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}
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@ -2265,7 +2263,7 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignme
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if (argv_expanded) {
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argv = argv_expanded;
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} else {
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argv = expand_strvec_to_strvec(argv);
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argv = expand_strvec_to_strvec(argv + assignment_cnt);
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#if !BB_MMU
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nommu_save->argv = argv;
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#endif
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@ -3628,7 +3626,6 @@ static int done_word(o_string *word, struct parse_context *ctx)
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ctx->ctx_dsemicolon = 0;
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} else
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#endif
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if (!command->argv /* if it's the first word... */
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#if ENABLE_HUSH_LOOPS
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&& ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
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@ -3767,8 +3764,7 @@ static FILE *generate_stream_from_list(struct pipe *head)
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/* Return code is exit status of the process that is run. */
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static int process_command_subs(o_string *dest,
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struct in_str *input,
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const char *subst_end)
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struct in_str *input)
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{
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int retcode, ch, eol_cnt;
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o_string result = NULL_O_STRING;
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@ -3777,7 +3773,7 @@ static int process_command_subs(o_string *dest,
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struct in_str pipe_str;
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/* Recursion to generate command */
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retcode = parse_stream(&result, &inner, input, subst_end);
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retcode = parse_stream(&result, &inner, input, NULL);
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if (retcode != 0)
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return retcode; /* syntax error or EOF */
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o_free(&result);
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@ -4236,9 +4232,11 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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* A single-quote triggers a bypass of the main loop until its mate is
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* found. When recursing, quote state is passed in via dest->o_escape. */
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debug_printf_parse("parse_stream entered, end_trigger='%s' dest->o_assignment:%d\n", end_trigger, dest->o_assignment);
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initialize_context(ctx);
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debug_printf_parse("parse_stream entered, end_trigger='%s' "
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"dest->o_assignment:%d\n", end_trigger, dest->o_assignment);
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dest->o_assignment = MAYBE_ASSIGNMENT;
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initialize_context(ctx);
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is_in_dquote = dest->o_escape;
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while (1) {
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if (is_in_dquote) {
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@ -4269,51 +4267,47 @@ static int parse_stream(o_string *dest, struct parse_context *ctx,
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}
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continue;
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}
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/* m is SPECIAL ($,`), IFS, or ORDINARY_IF_QUOTED (*,#)
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*/
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/* m is SPECIAL ($,`), IFS, or ORDINARY_IF_QUOTED (*,#) */
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if (m == CHAR_IFS) {
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if (ch == EOF)
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goto ret_EOF;
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if (done_word(dest, ctx)) {
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debug_printf_parse("parse_stream return 1: done_word!=0\n");
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return 1;
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}
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if (ch == EOF)
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goto ret_EOF;
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/* If we aren't performing a substitution, treat
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* a newline as a command separator.
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* [why don't we handle it exactly like ';'? --vda] */
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if (end_trigger && ch == '\n') {
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if (ch == '\n') {
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#if ENABLE_HUSH_CASE
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/* "case ... in <newline> word) ..." -
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* newlines are ignored (but ';' wouldn't be) */
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if (dest->length == 0 // && argv[0] == NULL
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if (ctx->command->argv == NULL
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&& ctx->ctx_res_w == RES_MATCH
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) {
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continue;
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}
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#endif
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/* Treat newline as a command separator.
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* [why don't we handle it exactly like ';'? --vda] */
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done_pipe(ctx, PIPE_SEQ);
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dest->o_assignment = MAYBE_ASSIGNMENT;
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}
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}
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if (end_trigger) {
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if (strchr(end_trigger, ch)) {
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/* Special case: (...word) makes last word terminate,
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* as if ';' is seen */
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if (ch == ')') {
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done_word(dest, ctx);
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if (end_trigger && strchr(end_trigger, ch)) {
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/* Special case: (...word) makes last word terminate,
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* as if ';' is seen */
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if (ch == ')') {
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done_word(dest, ctx);
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//err chk?
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done_pipe(ctx, PIPE_SEQ);
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dest->o_assignment = MAYBE_ASSIGNMENT;
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}
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/* What do we check here? */
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if (!HAS_KEYWORDS
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IF_HAS_KEYWORDS(|| (ctx->ctx_res_w == RES_NONE && ctx->old_flag == 0))
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) {
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debug_printf_parse("parse_stream return 0: end_trigger char found\n");
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/* this makes us return 0, not -1 */
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end_trigger = NULL;
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goto ret;
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}
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done_pipe(ctx, PIPE_SEQ);
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dest->o_assignment = MAYBE_ASSIGNMENT;
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}
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/* What do we check here? */
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if (!HAS_KEYWORDS
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IF_HAS_KEYWORDS(|| (ctx->ctx_res_w == RES_NONE && ctx->old_flag == 0))
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) {
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debug_printf_parse("parse_stream return 0: end_trigger char found\n");
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/* this makes us return 0, not -1 */
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end_trigger = NULL;
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goto ret;
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}
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}
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if (m == CHAR_IFS)
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6
shell/hush_test/hush-vars/var_in_pipes.right
Normal file
6
shell/hush_test/hush-vars/var_in_pipes.right
Normal file
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@ -0,0 +1,6 @@
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b=1
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b=2
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b=3
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b=4
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b=5
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b=6
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7
shell/hush_test/hush-vars/var_in_pipes.tests
Executable file
7
shell/hush_test/hush-vars/var_in_pipes.tests
Executable file
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@ -0,0 +1,7 @@
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b=1 env | grep ^b=
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true | b=2 env | grep ^b=
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a=1 true | b=3 env | grep ^b=
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(b=4 env) | grep ^b=
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(true | b=5 env) | grep ^b=
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(a=1 true | b=6 env) | grep ^b=
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