diff options
| -rw-r--r-- | shell/hush.c | 43 | ||||
| -rw-r--r-- | shell/hush_test/hush-misc/empty_args.right | 6 | ||||
| -rwxr-xr-x | shell/hush_test/hush-misc/empty_args.tests | 9 | ||||
| -rw-r--r-- | shell/hush_test/hush-psubst/emptytick.right | 7 | ||||
| -rwxr-xr-x | shell/hush_test/hush-psubst/emptytick.tests | 8 |
5 files changed, 58 insertions, 15 deletions
diff --git a/shell/hush.c b/shell/hush.c index 1d2826d..46bb7e9 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -2185,7 +2185,7 @@ static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg, char ored_ch = 0; - debug_printf_expand("expand_vars_to_list: arg '%s'\n", arg); + debug_printf_expand("expand_vars_to_list: arg:'%s' or_mask:%x\n", arg, or_mask); debug_print_list("expand_vars_to_list", output, n); n = o_save_ptr(output, n); debug_print_list("expand_vars_to_list[0]", output, n); @@ -3425,7 +3425,7 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save, sigprocmask(SIG_SETMASK, &G.inherited_set, NULL); execvp(argv[0], argv); bb_perror_msg("can't execute '%s'", argv[0]); - _exit(EXIT_FAILURE); + _exit(127); /* bash compat */ } /* Called after [v]fork() in run_pipe @@ -3895,7 +3895,7 @@ static NOINLINE int run_pipe(struct pipe *pi) argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt); } - /* if someone gives us an empty string: ``, $(), ... */ + /* if someone gives us an empty string: `cmd with empty output` */ if (!argv_expanded[0]) { debug_leave(); return 0; @@ -5802,7 +5802,7 @@ static int parse_stream_dquoted(o_string *as_string, if (ch != '\n') { next = i_peek(input); } - debug_printf_parse(": ch=%c (%d) escape=%d\n", + debug_printf_parse("\" ch=%c (%d) escape=%d\n", ch, ch, dest->o_escape); if (ch == '\\') { if (next == EOF) { @@ -5882,6 +5882,11 @@ static struct pipe *parse_stream(char **pstring, end_trigger ? end_trigger : 'X'); debug_enter(); + /* If very first arg is "" or '', dest.data may end up NULL. + * Preventing this: */ + o_addchr(&dest, '\0'); + dest.length = 0; + G.ifs = get_local_var_value("IFS"); if (G.ifs == NULL) G.ifs = " \t\n"; @@ -6979,16 +6984,32 @@ static int FAST_FUNC builtin_cd(char **argv) static int FAST_FUNC builtin_exec(char **argv) { - if (*++argv == NULL) - return EXIT_SUCCESS; /* bash does this */ - { + static const char pseudo_null_str[] = { SPECIAL_VAR_SYMBOL, SPECIAL_VAR_SYMBOL, '\0' }; + char **pp = argv; #if !BB_MMU - nommu_save_t dummy; + nommu_save_t dummy; #endif - /* TODO: if exec fails, bash does NOT exit! We do... */ - pseudo_exec_argv(&dummy, argv, 0, NULL); - /* never returns */ + + if (*++argv == NULL) + return EXIT_SUCCESS; /* bash does this */ + + /* Make sure empty arguments aren't ignored */ + /* Example: exec ls '' */ + pp = argv; + while (*pp) { + if ((*pp)[0] == '\0') + *pp = (char*)pseudo_null_str; + pp++; } + + /* Careful: we can end up here after [v]fork. Do not restore + * tty pgrp then, only top-level shell process does that */ + if (G_saved_tty_pgrp && getpid() == G.root_pid) + tcsetpgrp(G_interactive_fd, G_saved_tty_pgrp); + + /* TODO: if exec fails, bash does NOT exit! We do... */ + pseudo_exec_argv(&dummy, argv, 0, NULL); + /* never returns */ } static int FAST_FUNC builtin_exit(char **argv) diff --git a/shell/hush_test/hush-misc/empty_args.right b/shell/hush_test/hush-misc/empty_args.right new file mode 100644 index 0000000..38ed8b8 --- /dev/null +++ b/shell/hush_test/hush-misc/empty_args.right @@ -0,0 +1,6 @@ +Null 0th arg: +hush: can't execute '': No such file or directory +127 +Null 1st arg: +0 +Null arg in exec: diff --git a/shell/hush_test/hush-misc/empty_args.tests b/shell/hush_test/hush-misc/empty_args.tests new file mode 100755 index 0000000..efce549 --- /dev/null +++ b/shell/hush_test/hush-misc/empty_args.tests @@ -0,0 +1,9 @@ +echo Null 0th arg: +"" +echo $? +echo Null 1st arg: +# printf without args would print usage info +printf "" +echo $? +echo Null arg in exec: +exec printf "" diff --git a/shell/hush_test/hush-psubst/emptytick.right b/shell/hush_test/hush-psubst/emptytick.right index d4b70c5..1f60ecf 100644 --- a/shell/hush_test/hush-psubst/emptytick.right +++ b/shell/hush_test/hush-psubst/emptytick.right @@ -1,14 +1,17 @@ 0 0 +hush: can't execute '': No such file or directory 0 +hush: can't execute '': No such file or directory 0 0 0 0 0 +hush: can't execute '': No such file or directory 0 +hush: can't execute '': No such file or directory 0 0 0 -0 -0 +hush: can't execute '': No such file or directory diff --git a/shell/hush_test/hush-psubst/emptytick.tests b/shell/hush_test/hush-psubst/emptytick.tests index af3a183..a269f02 100755 --- a/shell/hush_test/hush-psubst/emptytick.tests +++ b/shell/hush_test/hush-psubst/emptytick.tests @@ -1,16 +1,20 @@ true; ``; echo $? false; ``; echo $? +# UNFIXED BUG. bash sets $? to 127: true; `""`; echo $? +# bash sets $? to 127: false; `""`; echo $? true; ` `; echo $? false; ` `; echo $? true; $(); echo $? false; $(); echo $? +# bash sets $? to 127: true; $(""); echo $? +# bash sets $? to 127: false; $(""); echo $? true; $( ); echo $? false; $( ); echo $? -true; exec ''; echo $? -false; exec ''; echo $? +exec ''; echo $? +echo Not reached |