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hush: fix heredoc <<- handling.
hush-misc/heredoc2.tests testcase needs only one fix now - $var and `cmd` expancsion in heredocs function old new delta parse_redirect 265 306 +41 parse_stream 1866 1899 +33
This commit is contained in:
parent
50f3aa4547
commit
af07b7c5b6
272
shell/hush.c
272
shell/hush.c
@ -250,16 +250,6 @@ static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER;
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#define SPECIAL_VAR_SYMBOL 3
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typedef enum redir_type {
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REDIRECT_INVALID = 0,
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REDIRECT_INPUT = 1,
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REDIRECT_OVERWRITE = 2,
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REDIRECT_APPEND = 3,
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REDIRECT_HEREDOC = 4,
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REDIRECT_IO = 5,
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REDIRECT_HEREDOC2 = 6, /* REDIRECT_HEREDOC after heredoc load */
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} redir_type;
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/* The descrip member of this structure is only used to make
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* debugging output pretty */
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static const struct {
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@ -349,10 +339,24 @@ typedef struct in_str {
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struct redir_struct {
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struct redir_struct *next;
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char *rd_filename; /* filename */
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int fd; /* file descriptor being redirected */
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int dup; /* -1, or file descriptor being duplicated */
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smallint /*enum redir_type*/ rd_type;
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int rd_fd; /* file descriptor being redirected */
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int rd_dup; /* -1, or file descriptor being duplicated */
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smallint rd_type; /* (enum redir_type) */
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/* note: for heredocs, rd_filename contains heredoc delimiter,
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* and subsequently heredoc itself; and rd_dup is
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* "do we need to trim leading tabs?" bool flag
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*/
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};
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typedef enum redir_type {
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REDIRECT_INVALID = 0,
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REDIRECT_INPUT = 1,
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REDIRECT_OVERWRITE = 2,
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REDIRECT_APPEND = 3,
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REDIRECT_HEREDOC = 4,
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REDIRECT_IO = 5,
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REDIRECT_HEREDOC2 = 6, /* REDIRECT_HEREDOC after heredoc is loaded */
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} redir_type;
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struct command {
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pid_t pid; /* 0 if exited */
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@ -910,6 +914,11 @@ static int check_and_run_traps(int sig)
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}
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#if ENABLE_HUSH_JOB
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/* After [v]fork, in child: do not restore tty pgrp on xfunc death */
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#define disable_restore_tty_pgrp_on_exit() (die_sleep = 0)
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/* After [v]fork, in parent: do not restore tty pgrp on xfunc death */
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#define enable_restore_tty_pgrp_on_exit() (die_sleep = -1)
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/* Restores tty foreground process group, and exits.
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* May be called as signal handler for fatal signal
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* (will faithfully resend signal to itself, producing correct exit state)
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@ -932,6 +941,11 @@ static void sigexit(int sig)
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kill_myself_with_sig(sig); /* does not return */
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}
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#else
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#define disable_restore_tty_pgrp_on_exit() ((void)0)
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#define enable_restore_tty_pgrp_on_exit() ((void)0)
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#endif
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/* Restores tty foreground process group, and exits. */
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@ -1359,6 +1373,13 @@ static void o_addstr(o_string *o, const char *str)
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{
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o_addblock(o, str, strlen(str));
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}
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static void nommu_addchr(o_string *o, int ch)
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{
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if (o)
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o_addchr(o, ch);
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}
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#else
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#define nommu_addchr(o, str) ((void)0)
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#endif
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static void o_addstr_with_NUL(o_string *o, const char *str)
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@ -2201,8 +2222,8 @@ static void setup_heredoc(int fd, const char *heredoc)
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/* Okay, pipe buffer was not big enough */
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/* Note: we must not create a stray child (bastard? :)
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* for the unsuspecting parent process. We create a grandchild
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* and exit before we exec the process which consumes heredoc
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* for the unsuspecting parent process. Child creates a grandchild
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* and exits before parent execs the process which consumes heredoc
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* (that exec happens after we return from this function) */
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pid = vfork();
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if (pid < 0)
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@ -2217,24 +2238,20 @@ static void setup_heredoc(int fd, const char *heredoc)
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/* grandchild */
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close(fd); /* read side of the pipe */
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#if BB_MMU
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full_write(pair.wr, heredoc, len);
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full_write(pair.wr, heredoc, len); /* may loop or block */
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_exit(0);
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#else
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/* Delegate blocking writes to another process */
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# if ENABLE_HUSH_JOB
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die_sleep = 0; /* do not restore tty pgrp on xfunc death */
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# endif
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disable_restore_tty_pgrp_on_exit();
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xmove_fd(pair.wr, STDOUT_FILENO);
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re_execute_shell(heredoc, 1);
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#endif
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}
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/* parent */
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#if ENABLE_HUSH_JOB
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die_sleep = -1; /* restore tty pgrp on xfunc death */
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#endif
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enable_restore_tty_pgrp_on_exit();
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clean_up_after_re_execute();
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close(pair.wr);
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wait(NULL); /* wiat till child has died */
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wait(NULL); /* wait till child has died */
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}
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/* squirrel != NULL means we squirrel away copies of stdin, stdout,
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@ -2247,18 +2264,18 @@ static int setup_redirects(struct command *prog, int squirrel[])
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for (redir = prog->redirects; redir; redir = redir->next) {
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if (redir->rd_type == REDIRECT_HEREDOC2) {
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if (squirrel && redir->fd < 3) {
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squirrel[redir->fd] = dup(redir->fd);
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if (squirrel && redir->rd_fd < 3) {
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squirrel[redir->rd_fd] = dup(redir->rd_fd);
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}
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/* for REDIRECT_HEREDOC2, rd_filename holds _contents_
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* of the heredoc */
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debug_printf_parse("set heredoc '%s'\n",
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redir->rd_filename);
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setup_heredoc(redir->fd, redir->rd_filename);
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setup_heredoc(redir->rd_fd, redir->rd_filename);
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continue;
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}
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if (redir->dup == -1) {
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if (redir->rd_dup == -1) {
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char *p;
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if (redir->rd_filename == NULL) {
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/* Something went wrong in the parse.
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@ -2277,19 +2294,19 @@ static int setup_redirects(struct command *prog, int squirrel[])
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return 1;
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}
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} else {
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openfd = redir->dup;
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openfd = redir->rd_dup;
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}
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if (openfd != redir->fd) {
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if (squirrel && redir->fd < 3) {
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squirrel[redir->fd] = dup(redir->fd);
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if (openfd != redir->rd_fd) {
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if (squirrel && redir->rd_fd < 3) {
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squirrel[redir->rd_fd] = dup(redir->rd_fd);
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}
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if (openfd == -3) {
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/* "-" means "close me" and we use -3 for that */
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close(redir->fd);
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close(redir->rd_fd);
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} else {
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dup2(openfd, redir->fd);
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if (redir->dup == -1)
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dup2(openfd, redir->rd_fd);
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if (redir->rd_dup == -1)
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close(openfd);
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}
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}
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@ -2350,7 +2367,7 @@ static void free_pipe(struct pipe *pi, int indent)
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#endif
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for (r = command->redirects; r; r = rnext) {
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debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->rd_type].descrip);
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if (r->dup == -1) {
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if (r->rd_dup == -1) {
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/* guard against the case >$FOO, where foo is unset or blank */
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if (r->rd_filename) {
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debug_printf_clean(" %s\n", r->rd_filename);
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@ -2358,7 +2375,7 @@ static void free_pipe(struct pipe *pi, int indent)
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r->rd_filename = NULL;
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}
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} else {
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debug_printf_clean("&%d\n", r->dup);
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debug_printf_clean("&%d\n", r->rd_dup);
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}
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rnext = r->next;
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free(r);
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@ -2968,7 +2985,7 @@ static int run_pipe(struct pipe *pi)
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command->pid = BB_MMU ? fork() : vfork();
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if (!command->pid) { /* child */
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#if ENABLE_HUSH_JOB
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die_sleep = 0; /* do not restore tty pgrp on xfunc death */
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disable_restore_tty_pgrp_on_exit();
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/* Every child adds itself to new process group
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* with pgid == pid_of_first_child_in_pipe */
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@ -3003,9 +3020,7 @@ static int run_pipe(struct pipe *pi)
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}
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/* parent or error */
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#if ENABLE_HUSH_JOB
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die_sleep = -1; /* restore tty pgrp on xfunc death */
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#endif
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enable_restore_tty_pgrp_on_exit();
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#if !BB_MMU
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/* Clean up after vforked child */
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clean_up_after_re_execute();
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@ -3914,15 +3929,11 @@ static int redirect_dup_num(o_string *as_string, struct in_str *input)
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return -1;
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ch = i_getch(input); /* get the & */
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#if !BB_MMU
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o_addchr(as_string, ch);
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#endif
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nommu_addchr(as_string, ch);
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ch = i_peek(input);
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if (ch == '-') {
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ch = i_getch(input);
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#if !BB_MMU
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o_addchr(as_string, ch);
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#endif
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nommu_addchr(as_string, ch);
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return -3; /* "-" represents "close me" */
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}
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d = 0;
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@ -3931,9 +3942,7 @@ static int redirect_dup_num(o_string *as_string, struct in_str *input)
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d = d*10 + (ch-'0');
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ok = 1;
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ch = i_getch(input);
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#if !BB_MMU
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o_addchr(as_string, ch);
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#endif
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nommu_addchr(as_string, ch);
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ch = i_peek(input);
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}
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if (ok) return d;
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@ -3962,8 +3971,21 @@ static int parse_redirect(struct parse_context *ctx,
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dup_num = redirect_dup_num(&ctx->as_string, input);
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if (dup_num == -2)
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return 1; /* syntax error */
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} else {
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int ch = i_peek(input);
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dup_num = (ch == '-');
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if (dup_num) { /* <<-... */
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ch = i_getch(input);
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nommu_addchr(&ctx->as_string, ch);
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ch = i_peek(input);
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}
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/* <<[-] word is the same as <<[-]word */
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while (ch == ' ' || ch == '\t') {
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ch = i_getch(input);
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nommu_addchr(&ctx->as_string, ch);
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ch = i_peek(input);
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}
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}
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//TODO: else { check for <<-word }
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if (style == REDIRECT_OVERWRITE && dup_num == -1) {
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int ch = i_peek(input);
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@ -3973,9 +3995,7 @@ static int parse_redirect(struct parse_context *ctx,
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* >| and > are the same for now. Just eat |.
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*/
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ch = i_getch(input);
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#if !BB_MMU
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o_addchr(&ctx->as_string, ch);
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#endif
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nommu_addchr(&ctx->as_string, ch);
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}
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}
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@ -3988,16 +4008,16 @@ static int parse_redirect(struct parse_context *ctx,
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/* redir->next = NULL; */
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/* redir->rd_filename = NULL; */
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redir->rd_type = style;
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redir->fd = (fd == -1) ? redir_table[style].default_fd : fd;
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redir->rd_fd = (fd == -1) ? redir_table[style].default_fd : fd;
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debug_printf_parse("redirect type %d %s\n", redir->fd, redir_table[style].descrip);
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debug_printf_parse("redirect type %d %s\n", redir->rd_fd, redir_table[style].descrip);
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redir->dup = dup_num;
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if (dup_num != -1) {
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redir->rd_dup = dup_num;
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if (style != REDIRECT_HEREDOC && dup_num != -1) {
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/* Erik had a check here that the file descriptor in question
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* is legit; I postpone that to "run time"
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* A "-" representation of "close me" shows up as a -3 here */
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debug_printf_parse("duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
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debug_printf_parse("duplicating redirect '%d>&%d'\n", redir->rd_fd, redir->rd_dup);
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} else {
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/* Set ctx->pending_redirect, so we know what to do at the
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* end of the next parsed word. */
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@ -4039,28 +4059,45 @@ static int redirect_opt_num(o_string *o)
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return num;
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}
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//TODO: add NOMMU as_string fill
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static char *fetch_till_str(struct in_str *input, const char *word)
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#if BB_MMU
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#define fetch_till_str(as_string, input, word, skip_tabs) \
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fetch_till_str(input, word, skip_tabs)
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#endif
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static char *fetch_till_str(o_string *as_string,
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struct in_str *input,
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const char *word,
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int skip_tabs)
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{
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o_string heredoc = NULL_O_STRING;
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int past_EOL = 0;
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int ch;
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goto jump_in;
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while (1) {
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ch = i_getch(input);
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if (ch == EOF) {
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o_free_unsafe(&heredoc);
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return NULL;
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}
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nommu_addchr(as_string, ch);
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if (ch == '\n') {
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if (strcmp(heredoc.data + past_EOL, word) == 0) {
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heredoc.data[past_EOL] = '\0';
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debug_printf_parse("parsed heredoc '%s'\n", heredoc.data);
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return heredoc.data;
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}
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past_EOL = heredoc.length + 1;
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do {
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o_addchr(&heredoc, ch);
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past_EOL = heredoc.length;
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jump_in:
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do {
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ch = i_getch(input);
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nommu_addchr(as_string, ch);
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} while (skip_tabs && ch == '\t');
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} while (ch == '\n');
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}
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if (ch == EOF) {
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o_free_unsafe(&heredoc);
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return NULL;
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}
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o_addchr(&heredoc, ch);
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nommu_addchr(as_string, ch);
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}
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}
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@ -4076,25 +4113,27 @@ static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_
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pi->num_cmds,
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cmd->argv ? cmd->argv[0] : "NONE");
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for (i = 0; i < pi->num_cmds; i++) {
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struct redir_struct *redirect = cmd->redirects;
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struct redir_struct *redir = cmd->redirects;
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debug_printf_parse("fetch_heredocs: %d cmd argv0:'%s'\n",
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i, cmd->argv ? cmd->argv[0] : "NONE");
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while (redirect) {
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if (redirect->rd_type == REDIRECT_HEREDOC) {
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while (redir) {
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if (redir->rd_type == REDIRECT_HEREDOC) {
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char *p;
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if (heredoc_cnt <= 0)
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return 1; /* error */
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redirect->rd_type = REDIRECT_HEREDOC2;
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p = fetch_till_str(input, redirect->rd_filename);
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redir->rd_type = REDIRECT_HEREDOC2;
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/* redir->dup is (ab)used to indicate <<- */
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p = fetch_till_str(&ctx->as_string, input,
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redir->rd_filename, redir->rd_dup);
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if (!p)
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return 1; /* unexpected EOF */
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free(redirect->rd_filename);
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redirect->rd_filename = p;
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free(redir->rd_filename);
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redir->rd_filename = p;
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heredoc_cnt--;
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}
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redirect = redirect->next;
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redir = redir->next;
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}
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cmd++;
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}
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@ -4126,9 +4165,7 @@ static FILE *generate_stream_from_string(const char *s)
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bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork");
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if (pid == 0) { /* child */
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#if ENABLE_HUSH_JOB
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die_sleep = 0; /* do not restore tty pgrp on xfunc death */
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#endif
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disable_restore_tty_pgrp_on_exit();
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/* Process substitution is not considered to be usual
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* 'command execution'.
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* SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
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@ -4157,9 +4194,7 @@ static FILE *generate_stream_from_string(const char *s)
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}
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/* parent */
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#if ENABLE_HUSH_JOB
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die_sleep = -1; /* restore tty pgrp on xfunc death */
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#endif
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enable_restore_tty_pgrp_on_exit();
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clean_up_after_re_execute();
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close(channel[1]);
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pf = fdopen(channel[0], "r");
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@ -4409,9 +4444,7 @@ static int handle_dollar(o_string *as_string,
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debug_printf_parse("handle_dollar entered: ch='%c'\n", ch);
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if (isalpha(ch)) {
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ch = i_getch(input);
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#if !BB_MMU
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if (as_string) o_addchr(as_string, ch);
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#endif
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nommu_addchr(as_string, ch);
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make_var:
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o_addchr(dest, SPECIAL_VAR_SYMBOL);
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while (1) {
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@ -4422,17 +4455,13 @@ static int handle_dollar(o_string *as_string,
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if (!isalnum(ch) && ch != '_')
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break;
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
if (as_string) o_addchr(as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(as_string, ch);
|
||||
}
|
||||
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
||||
} else if (isdigit(ch)) {
|
||||
make_one_char_var:
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
if (as_string) o_addchr(as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(as_string, ch);
|
||||
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
||||
debug_printf_parse(": '%c'\n", ch);
|
||||
o_addchr(dest, ch | quote_mask);
|
||||
@ -4450,18 +4479,14 @@ static int handle_dollar(o_string *as_string,
|
||||
|
||||
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
if (as_string) o_addchr(as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(as_string, ch);
|
||||
/* XXX maybe someone will try to escape the '}' */
|
||||
expansion = 0;
|
||||
first_char = true;
|
||||
all_digits = false;
|
||||
while (1) {
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
if (as_string) o_addchr(as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(as_string, ch);
|
||||
if (ch == '}')
|
||||
break;
|
||||
|
||||
@ -4530,15 +4555,11 @@ static int handle_dollar(o_string *as_string,
|
||||
int pos;
|
||||
# endif
|
||||
ch = i_getch(input);
|
||||
# if !BB_MMU
|
||||
if (as_string) o_addchr(as_string, ch);
|
||||
# endif
|
||||
nommu_addchr(as_string, ch);
|
||||
# if ENABLE_SH_MATH_SUPPORT
|
||||
if (i_peek(input) == '(') {
|
||||
ch = i_getch(input);
|
||||
# if !BB_MMU
|
||||
if (as_string) o_addchr(as_string, ch);
|
||||
# endif
|
||||
nommu_addchr(as_string, ch);
|
||||
o_addchr(dest, SPECIAL_VAR_SYMBOL);
|
||||
o_addchr(dest, /*quote_mask |*/ '+');
|
||||
# if !BB_MMU
|
||||
@ -4578,9 +4599,7 @@ static int handle_dollar(o_string *as_string,
|
||||
#endif
|
||||
case '_':
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
if (as_string) o_addchr(as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(as_string, ch);
|
||||
ch = i_peek(input);
|
||||
if (isalnum(ch)) { /* it's $_name or $_123 */
|
||||
ch = '_';
|
||||
@ -4611,9 +4630,8 @@ static int parse_stream_dquoted(o_string *as_string,
|
||||
|
||||
again:
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
if (as_string && ch != EOF) o_addchr(as_string, ch);
|
||||
#endif
|
||||
if (ch != EOF)
|
||||
nommu_addchr(as_string, ch);
|
||||
if (ch == dquote_end) { /* may be only '"' or EOF */
|
||||
dest->nonnull = 1;
|
||||
if (dest->o_assignment == NOT_ASSIGNMENT)
|
||||
@ -4769,9 +4787,7 @@ static struct pipe *parse_stream(char **pstring,
|
||||
#endif
|
||||
return pi;
|
||||
}
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
is_ifs = strchr(G.ifs, ch);
|
||||
is_special = strchr("<>;&|(){}#'" /* special outside of "str" */
|
||||
"\\$\"" USE_HUSH_TICK("`") /* always special */
|
||||
@ -4882,10 +4898,8 @@ static struct pipe *parse_stream(char **pstring,
|
||||
i_getch(input);
|
||||
/* note: we do not add it to &ctx.as_string */
|
||||
}
|
||||
#if !BB_MMU
|
||||
//TODO: go back one char?
|
||||
o_addchr(&ctx.as_string, '\n');
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, '\n');
|
||||
} else {
|
||||
o_addQchr(&dest, ch);
|
||||
}
|
||||
@ -4898,9 +4912,7 @@ static struct pipe *parse_stream(char **pstring,
|
||||
o_addchr(&dest, '\\');
|
||||
ch = i_getch(input);
|
||||
o_addchr(&dest, ch);
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
break;
|
||||
case '$':
|
||||
if (handle_dollar(&ctx.as_string, &dest, input) != 0) {
|
||||
@ -4917,9 +4929,7 @@ static struct pipe *parse_stream(char **pstring,
|
||||
syntax("unterminated '");
|
||||
goto parse_error;
|
||||
}
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
if (ch == '\'')
|
||||
break;
|
||||
if (dest.o_assignment == NOT_ASSIGNMENT)
|
||||
@ -4954,9 +4964,7 @@ static struct pipe *parse_stream(char **pstring,
|
||||
if (next == '>') {
|
||||
redir_style = REDIRECT_APPEND;
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
}
|
||||
#if 0
|
||||
else if (next == '(') {
|
||||
@ -4978,15 +4986,11 @@ static struct pipe *parse_stream(char **pstring,
|
||||
heredoc_cnt++;
|
||||
debug_printf_parse("++heredoc_cnt=%d\n", heredoc_cnt);
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
} else if (next == '>') {
|
||||
redir_style = REDIRECT_IO;
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
}
|
||||
#if 0
|
||||
else if (next == '(') {
|
||||
@ -5013,9 +5017,7 @@ static struct pipe *parse_stream(char **pstring,
|
||||
if (ch != ';')
|
||||
break;
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
if (ctx.ctx_res_w == RES_CASEI) {
|
||||
ctx.ctx_dsemicolon = 1;
|
||||
ctx.ctx_res_w = RES_MATCH;
|
||||
@ -5034,9 +5036,7 @@ static struct pipe *parse_stream(char **pstring,
|
||||
}
|
||||
if (next == '&') {
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
done_pipe(&ctx, PIPE_AND);
|
||||
} else {
|
||||
done_pipe(&ctx, PIPE_BG);
|
||||
@ -5052,9 +5052,7 @@ static struct pipe *parse_stream(char **pstring,
|
||||
#endif
|
||||
if (next == '|') { /* || */
|
||||
ch = i_getch(input);
|
||||
#if !BB_MMU
|
||||
o_addchr(&ctx.as_string, ch);
|
||||
#endif
|
||||
nommu_addchr(&ctx.as_string, ch);
|
||||
done_pipe(&ctx, PIPE_OR);
|
||||
} else {
|
||||
/* we could pick up a file descriptor choice here
|
||||
@ -5537,7 +5535,7 @@ int hush_main(int argc, char **argv)
|
||||
tcsetpgrp(G_interactive_fd, getpid());
|
||||
/* -1 is special - makes xfuncs longjmp, not exit
|
||||
* (we reset die_sleep = 0 whereever we [v]fork) */
|
||||
die_sleep = -1;
|
||||
enable_restore_tty_pgrp_on_exit(); /* sets die_sleep = -1 */
|
||||
if (setjmp(die_jmp)) {
|
||||
/* xfunc has failed! die die die */
|
||||
hush_exit(xfunc_error_retval);
|
||||
|
Loading…
Reference in New Issue
Block a user