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hush: make pun_pipe loop clearer; fix "cmd | var=cmd | cmd" handling

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function                                             old     new   delta
free_strings                                           -      38     +38
pseudo_exec_argv                                     161     171     +10
free_pipe                                            227     205     -22
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/1 up/down: 48/-22)             Total: 26 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-07-14 19:01:25 +02:00
parent 6ac37da425
commit 889550b36b
1 changed files with 27 additions and 17 deletions
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44
shell/hush.c
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@ -3713,11 +3713,17 @@ static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save,
{
char **new_env;
/* Case when we are here: ... | var=val | ... */
if (!argv[assignment_cnt])
_exit(EXIT_SUCCESS);
new_env = expand_assignments(argv, assignment_cnt);
if (!argv[assignment_cnt]) {
/* Case when we are here: ... | var=val | ...
* (note that we do not exit early, i.e., do not optimize out
* expand_assignments(): think about ... | var=`sleep 1` | ...
*/
free_strings(new_env);
_exit(EXIT_SUCCESS);
}
#if BB_MMU
set_vars_and_save_old(new_env);
free(new_env); /* optional */
@ -3727,6 +3733,7 @@ static NOINLINE void pseudo_exec_argv(nommu_save_t *nommu_save,
nommu_save->new_env = new_env;
nommu_save->old_vars = set_vars_and_save_old(new_env);
#endif
if (argv_expanded) {
argv = argv_expanded;
} else {
@ -4145,8 +4152,9 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
static NOINLINE int run_pipe(struct pipe *pi)
{
static const char *const null_ptr = NULL;
int i;
int nextin;
int cmd_no;
int next_infd;
struct command *command;
char **argv_expanded;
char **argv;
@ -4160,7 +4168,7 @@ static NOINLINE int run_pipe(struct pipe *pi)
IF_HUSH_JOB(pi->pgrp = -1;)
pi->stopped_cmds = 0;
command = &(pi->cmds[0]);
command = &pi->cmds[0];
argv_expanded = NULL;
if (pi->num_cmds != 1
@ -4358,9 +4366,10 @@ static NOINLINE int run_pipe(struct pipe *pi)
/* Going to fork a child per each pipe member */
pi->alive_cmds = 0;
nextin = 0;
next_infd = 0;
for (i = 0; i < pi->num_cmds; i++) {
cmd_no = 0;
while (cmd_no < pi->num_cmds) {
struct fd_pair pipefds;
#if !BB_MMU
volatile nommu_save_t nommu_save;
@ -4369,7 +4378,8 @@ static NOINLINE int run_pipe(struct pipe *pi)
nommu_save.argv = NULL;
nommu_save.argv_from_re_execing = NULL;
#endif
command = &(pi->cmds[i]);
command = &pi->cmds[cmd_no];
cmd_no++;
if (command->argv) {
debug_printf_exec(": pipe member '%s' '%s'...\n",
command->argv[0], command->argv[1]);
@ -4380,7 +4390,7 @@ static NOINLINE int run_pipe(struct pipe *pi)
/* pipes are inserted between pairs of commands */
pipefds.rd = 0;
pipefds.wr = 1;
if ((i + 1) < pi->num_cmds)
if (cmd_no < pi->num_cmds)
xpiped_pair(pipefds);
command->pid = BB_MMU ? fork() : vfork();
@ -4413,7 +4423,7 @@ static NOINLINE int run_pipe(struct pipe *pi)
if (open(bb_dev_null, O_RDONLY))
xopen("/", O_RDONLY);
} else {
xmove_fd(nextin, 0);
xmove_fd(next_infd, 0);
}
xmove_fd(pipefds.wr, 1);
if (pipefds.rd > 1)
@ -4460,12 +4470,12 @@ static NOINLINE int run_pipe(struct pipe *pi)
#endif
}
if (i)
close(nextin);
if ((i + 1) < pi->num_cmds)
if (cmd_no > 1)
close(next_infd);
if (cmd_no < pi->num_cmds)
close(pipefds.wr);
/* Pass read (output) pipe end to next iteration */
nextin = pipefds.rd;
next_infd = pipefds.rd;
}
if (!pi->alive_cmds) {
@ -7153,7 +7163,7 @@ int hush_main(int argc, char **argv)
#endif
case 'n':
case 'x':
if (!set_mode('-', opt))
if (set_mode('-', opt) == 0) /* no error */
break;
default:
#ifndef BB_VER