hush: make "set -x" output don't redirectable when fd#2 redirected
function old new delta x_mode_print_optionally_squoted - 120 +120 x_mode_flush - 68 +68 save_fd_on_redirect 208 243 +35 x_mode_prefix - 27 +27 x_mode_addblock - 23 +23 x_mode_addchr - 17 +17 dump_cmd_in_x_mode 110 85 -25 run_pipe 1919 1890 -29 print_optionally_squoted 145 - -145 ------------------------------------------------------------------------------ (add/remove: 5/1 grow/shrink: 1/2 up/down: 290/-199) Total: 91 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
4b70c926bc
commit
aa449c927d
129
shell/hush.c
129
shell/hush.c
@ -954,9 +954,6 @@ struct globals {
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unsigned func_nest_level; /* solely to prevent "local v" in non-functions */
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# endif
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struct function *top_func;
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#endif
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#if ENABLE_HUSH_MODE_X
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unsigned x_mode_depth;
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#endif
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/* Signal and trap handling */
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#if ENABLE_HUSH_FAST
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@ -993,6 +990,15 @@ struct globals {
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#if ENABLE_HUSH_MEMLEAK
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unsigned long memleak_value;
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#endif
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#if ENABLE_HUSH_MODE_X
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unsigned x_mode_depth;
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/* "set -x" output should not be redirectable with subsequent 2>FILE.
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* We dup fd#2 to x_mode_fd when "set -x" is executed, and use it
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* for all subsequent output.
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*/
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int x_mode_fd;
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o_string x_mode_buf;
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#endif
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#if HUSH_DEBUG
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int debug_indent;
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#endif
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@ -1660,6 +1666,12 @@ static int move_HFILEs_on_redirect(int fd, int avoid_fd)
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}
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fl = fl->next_hfile;
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}
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#if ENABLE_HUSH_MODE_X
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if (G.x_mode_fd > 0 && fd == G.x_mode_fd) {
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G.x_mode_fd = xdup_CLOEXEC_and_close(fd, avoid_fd);
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return 1; /* "found and moved" */
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}
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#endif
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return 0; /* "not in the list" */
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}
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#if ENABLE_FEATURE_SH_STANDALONE && BB_MMU
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@ -2903,6 +2915,11 @@ static void o_addstr(o_string *o, const char *str)
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o_addblock(o, str, strlen(str));
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}
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static void o_addstr_with_NUL(o_string *o, const char *str)
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{
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o_addblock(o, str, strlen(str) + 1);
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}
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#if !BB_MMU
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static void nommu_addchr(o_string *o, int ch)
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{
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@ -2913,10 +2930,36 @@ static void nommu_addchr(o_string *o, int ch)
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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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#if ENABLE_HUSH_MODE_X
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static void x_mode_addchr(int ch)
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{
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o_addblock(o, str, strlen(str) + 1);
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o_addchr(&G.x_mode_buf, ch);
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}
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static void x_mode_addstr(const char *str)
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{
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o_addstr(&G.x_mode_buf, str);
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}
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static void x_mode_addblock(const char *str, int len)
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{
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o_addblock(&G.x_mode_buf, str, len);
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}
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static void x_mode_prefix(void)
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{
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int n = G.x_mode_depth;
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do x_mode_addchr('+'); while (--n >= 0);
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}
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static void x_mode_flush(void)
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{
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int len = G.x_mode_buf.length;
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if (len <= 0)
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return;
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if (G.x_mode_fd > 0) {
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G.x_mode_buf.data[len] = '\n';
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full_write(G.x_mode_fd, G.x_mode_buf.data, len + 1);
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}
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G.x_mode_buf.length = 0;
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}
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#endif
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/*
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* HUSH_BRACE_EXPANSION code needs corresponding quoting on variable expansion side.
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@ -8030,31 +8073,26 @@ static void execvp_or_die(char **argv)
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}
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#if ENABLE_HUSH_MODE_X
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static void print_optionally_squoted(FILE *fp, const char *str)
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static void x_mode_print_optionally_squoted(const char *str)
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{
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unsigned len;
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const char *cp;
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cp = str;
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if (str[0] != '{' && str[0] != '(') for (;;) {
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if (!*cp) {
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/* string has no special chars */
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fputs(str, fp);
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return;
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}
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if (*cp == '\\') break;
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if (*cp == '\'') break;
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if (*cp == '"') break;
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if (*cp == '$') break;
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if (*cp == '!') break;
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if (*cp == '*') break;
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if (*cp == '[') break;
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if (*cp == ']') break;
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#if ENABLE_HUSH_TICK
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if (*cp == '`') break;
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#endif
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if (isspace(*cp)) break;
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cp++;
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/* the set of chars which-cause-string-to-be-squoted mimics bash */
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/* test a char with: bash -c 'set -x; echo "CH"' */
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if (str[strcspn(str, "\\\"'`$(){}[]<>;#&|~*?!^"
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" " "\001\002\003\004\005\006\007"
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"\010\011\012\013\014\015\016\017"
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"\020\021\022\023\024\025\026\027"
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"\030\031\032\033\034\035\036\037"
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)
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] == '\0'
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) {
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/* string has no special chars */
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x_mode_addstr(str);
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return;
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}
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cp = str;
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@ -8062,13 +8100,16 @@ static void print_optionally_squoted(FILE *fp, const char *str)
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/* print '....' up to EOL or first squote */
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len = (int)(strchrnul(cp, '\'') - cp);
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if (len != 0) {
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fprintf(fp, "'%.*s'", len, cp);
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x_mode_addchr('\'');
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x_mode_addblock(cp, len);
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x_mode_addchr('\'');
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cp += len;
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}
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if (*cp == '\0')
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break;
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/* string contains squote(s), print them as \' */
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fprintf(fp, "\\'");
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x_mode_addchr('\\');
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x_mode_addchr('\'');
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cp++;
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}
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}
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@ -8078,19 +8119,19 @@ static void dump_cmd_in_x_mode(char **argv)
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unsigned n;
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/* "+[+++...][ cmd...]\n\0" */
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n = G.x_mode_depth;
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do bb_putchar_stderr('+'); while ((int)(--n) >= 0);
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x_mode_prefix();
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n = 0;
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while (argv[n]) {
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if (argv[n][0] == '\0')
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fputs(" ''", stderr);
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else {
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bb_putchar_stderr(' ');
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print_optionally_squoted(stderr, argv[n]);
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x_mode_addchr(' ');
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if (argv[n][0] == '\0') {
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x_mode_addchr('\'');
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x_mode_addchr('\'');
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} else {
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x_mode_print_optionally_squoted(argv[n]);
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}
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n++;
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}
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bb_putchar_stderr('\n');
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x_mode_flush();
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}
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}
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#else
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@ -8885,17 +8926,14 @@ static NOINLINE int run_pipe(struct pipe *pi)
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#if ENABLE_HUSH_MODE_X
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if (G_x_mode) {
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char *eq;
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if (i == 0) {
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unsigned n = G.x_mode_depth;
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do
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bb_putchar_stderr('+');
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while ((int)(--n) >= 0);
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}
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if (i == 0)
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x_mode_prefix();
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x_mode_addchr(' ');
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eq = strchrnul(p, '=');
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fprintf(stderr, " %.*s=", (int)(eq - p), p);
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if (*eq)
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print_optionally_squoted(stderr, eq + 1);
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bb_putchar_stderr('\n');
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if (*eq) eq++;
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x_mode_addblock(p, (eq - p));
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x_mode_print_optionally_squoted(eq);
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x_mode_flush();
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}
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#endif
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debug_printf_env("set shell var:'%s'->'%s'\n", *argv, p);
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@ -9691,6 +9729,7 @@ static int set_mode(int state, char mode, const char *o_opt)
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break;
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case 'x':
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IF_HUSH_MODE_X(G_x_mode = state;)
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IF_HUSH_MODE_X(if (G.x_mode_fd <= 0) G.x_mode_fd = dup_CLOEXEC(2, 10);)
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break;
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case 'o':
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if (!o_opt) {
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