hush: fix heredoc expansion of $var and cmd
function old new delta expand_pseudo_dquoted - 104 +104 setup_heredoc 215 275 +60 done_word 669 691 +22 parse_stream 1899 1902 +3 setup_redirects 196 191 -5 free_pipe 189 183 -6 expand_variables 2349 2229 -120 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 3/3 up/down: 189/-131) Total: 58 bytes
This commit is contained in:
Denis Vlasenko
parent
25af86f73d
commit
02d6f1ad72
151
shell/hush.c
151
shell/hush.c
@ -305,7 +305,9 @@ typedef struct o_string {
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* (by prepending \ to *, ?, [, \) */
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smallint o_escape;
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smallint o_glob;
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smallint nonnull;
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/* At least some part of the string was inside '' or "",
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* possibly empty one: word"", wo''rd etc. */
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smallint o_quoted;
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smallint has_empty_slot;
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smallint o_assignment; /* 0:maybe, 1:yes, 2:no */
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} o_string;
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@ -339,12 +341,14 @@ 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 rd_fd; /* file descriptor being redirected */
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int rd_dup; /* -1, or file descriptor being duplicated */
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int rd_fd; /* fd to redirect */
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/* fd to redirect to, or -3 if rd_fd is to be closed (n>&-) */
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int rd_dup;
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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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* and subsequently heredoc itself; and rd_dup is a bitmask:
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* 1: do we need to trim leading tabs?
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* 2: is heredoc quoted (<<'dleim' syntax) ?
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*/
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};
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typedef enum redir_type {
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@ -355,6 +359,9 @@ typedef enum redir_type {
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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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REDIRFD_CLOSE = -3,
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HEREDOC_SKIPTABS = 1,
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HEREDOC_QUOTED = 2,
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} redir_type;
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@ -1328,7 +1335,7 @@ static void setup_string_in_str(struct in_str *i, const char *s)
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static void o_reset(o_string *o)
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{
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o->length = 0;
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o->nonnull = 0;
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o->o_quoted = 0;
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if (o->data)
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o->data[0] = '\0';
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}
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@ -1677,6 +1684,39 @@ static int expand_on_ifs(o_string *output, int n, const char *str)
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return n;
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}
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/* Helper to expand $((...)) and heredoc body. These act as if
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* they are in double quotes, with the exception that they are not :).
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* Just the rules are similar: "expand only $var and `cmd`"
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*
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* Returns malloced string.
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* As an optimization, we return NULL if expansion is not needed.
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*/
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static char *expand_pseudo_dquoted(const char *str)
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{
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char *exp_str;
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struct in_str input;
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o_string dest = NULL_O_STRING;
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if (strchr(str, '$') == NULL
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#if ENABLE_HUSH_TICK
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&& strchr(str, '`') == NULL
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#endif
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) {
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return NULL;
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}
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/* We need to expand. Example:
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* echo $(($a + `echo 1`)) $((1 + $((2)) ))
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*/
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setup_string_in_str(&input, str);
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parse_stream_dquoted(NULL, &dest, &input, EOF);
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//bb_error_msg("'%s' -> '%s'", str, dest.data);
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exp_str = expand_string_to_string(dest.data);
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//bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
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o_free_unsafe(&dest);
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return exp_str;
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}
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/* Expand all variable references in given string, adding words to list[]
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* at n, n+1,... positions. Return updated n (so that list[n] is next one
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* to be filled). This routine is extremely tricky: has to deal with
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@ -1809,26 +1849,7 @@ static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
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*p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
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debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch);
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/* Optional: skip expansion if expr is simple ("a + 3", "i++" etc) */
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exp_str = NULL;
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if (strchr(arg, '$') != NULL
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#if ENABLE_HUSH_TICK
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|| strchr(arg, '`') != NULL
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#endif
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) {
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/* We need to expand. Example:
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* echo $(($a + `echo 1`)) $((1 + $((2)) ))
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*/
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struct in_str input;
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o_string dest = NULL_O_STRING;
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setup_string_in_str(&input, arg);
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parse_stream_dquoted(NULL, &dest, &input, EOF);
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//bb_error_msg("'%s' -> '%s'", arg, dest.data);
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exp_str = expand_string_to_string(dest.data);
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//bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
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o_free_unsafe(&dest);
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}
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exp_str = expand_pseudo_dquoted(arg);
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hooks.lookupvar = get_local_var_value;
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hooks.setvar = arith_set_local_var;
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hooks.endofname = endofname;
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@ -2195,16 +2216,26 @@ static void clean_up_after_re_execute(void)
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#endif /* !BB_MMU */
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static void setup_heredoc(int fd, const char *heredoc)
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static void setup_heredoc(struct redir_struct *redir)
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{
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struct fd_pair pair;
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pid_t pid;
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int len, written;
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/* the _body_ of heredoc (misleading field name) */
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const char *heredoc = redir->rd_filename;
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char *expanded;
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expanded = NULL;
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if (!(redir->rd_dup & HEREDOC_QUOTED)) {
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expanded = expand_pseudo_dquoted(heredoc);
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if (expanded)
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heredoc = expanded;
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}
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len = strlen(heredoc);
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xpiped_pair(pair);
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xmove_fd(pair.rd, fd);
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xmove_fd(pair.rd, redir->rd_fd);
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len = strlen(heredoc);
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/* Try writing without forking. Newer kernels have
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* dynamically growing pipes. Must use non-blocking write! */
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ndelay_on(pair.wr);
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@ -2237,7 +2268,7 @@ static void setup_heredoc(int fd, const char *heredoc)
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if (pid != 0)
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_exit(0);
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/* grandchild */
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close(fd); /* read side of the pipe */
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close(redir->rd_fd); /* read side of the pipe */
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#if BB_MMU
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full_write(pair.wr, heredoc, len); /* may loop or block */
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_exit(0);
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@ -2252,6 +2283,7 @@ static void setup_heredoc(int fd, const char *heredoc)
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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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free(expanded);
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wait(NULL); /* wait till child has died */
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}
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@ -2272,7 +2304,7 @@ static int setup_redirects(struct command *prog, int squirrel[])
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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->rd_fd, redir->rd_filename);
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setup_heredoc(redir);
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continue;
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}
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@ -2302,11 +2334,11 @@ static int setup_redirects(struct command *prog, int squirrel[])
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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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if (openfd == REDIRFD_CLOSE) {
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/* "n>-" means "close me" */
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close(redir->rd_fd);
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} else {
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dup2(openfd, redir->rd_fd);
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xdup2(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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@ -2350,14 +2382,16 @@ static void free_pipe(struct pipe *pi, int indent)
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debug_printf_clean("%s command %d:\n", indenter(indent), i);
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if (command->argv) {
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for (a = 0, p = command->argv; *p; a++, p++) {
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debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
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debug_printf_clean("%s argv[%d] = %s\n",
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indenter(indent), a, *p);
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}
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free_strings(command->argv);
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command->argv = NULL;
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}
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/* not "else if": on syntax error, we may have both! */
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if (command->group) {
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debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type);
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debug_printf_clean("%s begin group (grp_type:%d)\n",
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indenter(indent), command->grp_type);
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free_pipe_list(command->group, indent+3);
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debug_printf_clean("%s end group\n", indenter(indent));
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command->group = NULL;
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@ -2367,17 +2401,15 @@ static void free_pipe(struct pipe *pi, int indent)
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command->group_as_string = NULL;
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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->rd_dup == -1) {
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debug_printf_clean("%s redirect %d%s", indenter(indent),
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r->fd, redir_table[r->rd_type].descrip);
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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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debug_printf_clean(" fname:'%s'\n", r->rd_filename);
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free(r->rd_filename);
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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->rd_dup);
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}
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debug_printf_clean(" rd_dup:%d\n", r->rd_dup);
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rnext = r->next;
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free(r);
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}
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@ -3791,7 +3823,7 @@ static int done_word(o_string *word, struct parse_context *ctx)
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struct command *command = ctx->command;
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debug_printf_parse("done_word entered: '%s' %p\n", word->data, command);
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if (word->length == 0 && word->nonnull == 0) {
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if (word->length == 0 && word->o_quoted == 0) {
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debug_printf_parse("done_word return 0: true null, ignored\n");
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return 0;
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}
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@ -3821,6 +3853,11 @@ static int done_word(o_string *word, struct parse_context *ctx)
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* the expansion would result in one word."
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*/
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ctx->pending_redirect->rd_filename = xstrdup(word->data);
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if (ctx->pending_redirect->rd_type == REDIRECT_HEREDOC
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&& word->o_quoted
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) {
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ctx->pending_redirect->rd_dup |= HEREDOC_QUOTED;
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}
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word->o_assignment = NOT_ASSIGNMENT;
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debug_printf_parse("word stored in rd_filename: '%s'\n", word->data);
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} else {
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@ -3862,7 +3899,7 @@ static int done_word(o_string *word, struct parse_context *ctx)
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}
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}
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#endif
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if (word->nonnull /* word had "xx" or 'xx' at least as part of it. */
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if (word->o_quoted /* word had "xx" or 'xx' at least as part of it. */
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/* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
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&& (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
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/* (otherwise it's known to be not empty and is already safe) */
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@ -3914,7 +3951,7 @@ static int done_word(o_string *word, struct parse_context *ctx)
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/* Peek ahead in the input to find out if we have a "&n" construct,
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* as in "2>&1", that represents duplicating a file descriptor.
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* Return: -3 if >&- "close fd" construct is seen,
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* Return: REDIRFD_CLOSE (-3) if >&- "close fd" construct is seen,
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* -2 (syntax error), -1 if no & was seen, or the number found.
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*/
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#if BB_MMU
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@ -3935,7 +3972,7 @@ static int redirect_dup_num(o_string *as_string, struct in_str *input)
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if (ch == '-') {
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ch = i_getch(input);
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nommu_addchr(as_string, ch);
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return -3; /* "-" represents "close me" */
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return REDIRFD_CLOSE;
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}
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d = 0;
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ok = 0;
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@ -3974,7 +4011,7 @@ static int parse_redirect(struct parse_context *ctx,
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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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dup_num = (ch == '-'); /* HEREDOC_SKIPTABS bit is 1 */
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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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@ -4011,14 +4048,16 @@ static int parse_redirect(struct parse_context *ctx,
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redir->rd_type = style;
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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->rd_fd, redir_table[style].descrip);
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debug_printf_parse("redirect type %d %s\n", redir->rd_fd,
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redir_table[style].descrip);
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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->rd_fd, redir->rd_dup);
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debug_printf_parse("duplicating redirect '%d>&%d'\n",
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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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@ -4127,7 +4166,7 @@ static int fetch_heredocs(int heredoc_cnt, struct parse_context *ctx, struct in_
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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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redir->rd_filename, redir->rd_dup & HEREDOC_SKIPTABS);
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if (!p)
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return 1; /* unexpected EOF */
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free(redir->rd_filename);
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@ -4264,7 +4303,7 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
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#endif
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if (command->argv /* word [word](... */
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|| dest->length /* word(... */
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|| dest->nonnull /* ""(... */
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|| dest->o_quoted /* ""(... */
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) {
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syntax(NULL);
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debug_printf_parse("parse_group return 1: "
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@ -4634,7 +4673,7 @@ static int parse_stream_dquoted(o_string *as_string,
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if (ch != EOF)
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nommu_addchr(as_string, ch);
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if (ch == dquote_end) { /* may be only '"' or EOF */
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dest->nonnull = 1;
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dest->o_quoted = 1;
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if (dest->o_assignment == NOT_ASSIGNMENT)
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dest->o_escape ^= 1;
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debug_printf_parse("parse_stream_dquoted return 0\n");
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@ -4923,7 +4962,7 @@ static struct pipe *parse_stream(char **pstring,
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}
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break;
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case '\'':
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dest.nonnull = 1;
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dest.o_quoted = 1;
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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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@ -4940,7 +4979,7 @@ static struct pipe *parse_stream(char **pstring,
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}
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break;
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case '"':
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dest.nonnull = 1;
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dest.o_quoted = 1;
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is_in_dquote ^= 1; /* invert */
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if (dest.o_assignment == NOT_ASSIGNMENT)
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dest.o_escape ^= 1;
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@ -5068,14 +5107,14 @@ static struct pipe *parse_stream(char **pstring,
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if (ctx.ctx_res_w == RES_MATCH
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&& ctx.command->argv == NULL /* not (word|(... */
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&& dest.length == 0 /* not word(... */
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&& dest.nonnull == 0 /* not ""(... */
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&& dest.o_quoted == 0 /* not ""(... */
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) {
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continue;
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}
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#endif
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#if ENABLE_HUSH_FUNCTIONS
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if (dest.length != 0 /* not just () but word() */
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&& dest.nonnull == 0 /* not a"b"c() */
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&& dest.o_quoted == 0 /* not a"b"c() */
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&& ctx.command->argv == NULL /* it's the first word */
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//TODO: "func ( ) {...}" - note spaces - is valid format too in bash
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&& i_peek(input) == ')'
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@ -1,6 +1,7 @@
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exit EOF-f
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"
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echo 1
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echo Hello World
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moo
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EOF-f
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EOF-f f
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@ -3,6 +3,7 @@ f=1
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exit EOF-f
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"
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echo $f
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echo `echo Hello World`
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moo
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EOF-f
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EOF-f f
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8
shell/hush_test/hush-misc/heredoc3.right
Normal file
8
shell/hush_test/hush-misc/heredoc3.right
Normal file
@ -0,0 +1,8 @@
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exit EOF-f
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"
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echo $f
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echo `echo Hello World`
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moo
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EOF-f
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EOF-f f
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EOF-f
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11
shell/hush_test/hush-misc/heredoc3.tests
Executable file
11
shell/hush_test/hush-misc/heredoc3.tests
Executable file
@ -0,0 +1,11 @@
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f=1
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cat <<- EOF-f""
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exit EOF-f
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"
|
||||
echo $f
|
||||
echo `echo Hello World`
|
||||
moo
|
||||
EOF-f
|
||||
EOF-f f
|
||||
EOF-f
|
||||
EOF-f
|
||||
Loading…
Reference in New Issue
Block a user