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hush: fix "set -x" output prefix overlapping for v="..cmd.." case

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Was printing initial "+" prefix for the assignment, that printing

	"+ cmd"

then printing the expanded " v=VAL" string.

Delay printing of "+" prefix for the assignment to after expansion.

function                                             old     new   delta
run_pipe                                            1883    1902     +19
builtin_eval                                         127     133      +6
expand_vars_to_list                                 1103    1106      +3
dump_cmd_in_x_mode                                   144     142      -2
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 28/-2)              Total: 26 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-07-27 14:12:05 +02:00
parent 186cf49767
commit 9dda9270df
1 changed files with 20 additions and 14 deletions
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34
shell/hush.c
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@ -896,7 +896,6 @@ struct globals {
char o_opt[NUM_OPT_O];
#if ENABLE_HUSH_MODE_X
smalluint x_mode_depth;
# define G_x_mode (G.o_opt[OPT_O_XTRACE])
#else
# define G_x_mode 0
@ -955,6 +954,9 @@ struct globals {
unsigned func_nest_level; /* solely to prevent "local v" in non-functions */
# endif
struct function *top_func;
#endif
#if ENABLE_HUSH_MODE_X
unsigned x_mode_depth;
#endif
/* Signal and trap handling */
#if ENABLE_HUSH_FAST
@ -7247,6 +7249,7 @@ static int generate_stream_from_string(const char *s, pid_t *pid_p)
CLEAR_RANDOM_T(&G.random_gen); /* or else $RANDOM repeats in child */
reset_traps_to_defaults();
IF_HUSH_MODE_X(G.x_mode_depth++;)
//bb_error_msg("%s: ++x_mode_depth=%d", __func__, G.x_mode_depth);
parse_and_run_string(s);
_exit(G.last_exitcode);
# else
@ -8032,17 +8035,16 @@ static void dump_cmd_in_x_mode(char **argv)
if (G_x_mode && argv) {
/* We want to output the line in one write op */
char *buf, *p;
int len;
int n;
unsigned len;
unsigned n;
len = G.x_mode_depth + 3; /* "+[+++...]<cmd...>\n\0" */
len = G.x_mode_depth + 3; /* "+[+++...][ cmd...]\n\0" */
n = 0;
while (argv[n])
len += strlen(argv[n++]) + 1;
p = buf = xmalloc(len);
n = G.x_mode_depth;
while (n-- >= 0)
*p++ = '+';
do *p++ = '+'; while ((int)(--n) >= 0);
n = 0;
while (argv[n])
p += sprintf(p, " %s", argv[n++]);
@ -8835,21 +8837,23 @@ static NOINLINE int run_pipe(struct pipe *pi)
restore_redirects(squirrel);
/* Set shell variables */
#if ENABLE_HUSH_MODE_X
if (G_x_mode) {
int n = G.x_mode_depth;
while (n-- >= 0)
bb_putchar_stderr('+');
}
#endif
i = 0;
while (i < command->assignment_cnt) {
char *p = expand_string_to_string(argv[i],
EXP_FLAG_ESC_GLOB_CHARS,
/*unbackslash:*/ 1
);
if (G_x_mode)
#if ENABLE_HUSH_MODE_X
if (G_x_mode) {
if (i == 0) {
unsigned n = G.x_mode_depth;
do
bb_putchar_stderr('+');
while ((int)(--n) >= 0);
}
fprintf(stderr, " %s", p);
}
#endif
debug_printf_env("set shell var:'%s'->'%s'\n", *argv, p);
if (set_local_var(p, /*flag:*/ 0)) {
/* assignment to readonly var / putenv error? */
@ -10246,6 +10250,7 @@ static int FAST_FUNC builtin_eval(char **argv)
return EXIT_SUCCESS;
IF_HUSH_MODE_X(G.x_mode_depth++;)
//bb_error_msg("%s: ++x_mode_depth=%d", __func__, G.x_mode_depth);
if (!argv[1]) {
/* bash:
* eval "echo Hi; done" ("done" is syntax error):
@ -10276,6 +10281,7 @@ static int FAST_FUNC builtin_eval(char **argv)
free(str);
}
IF_HUSH_MODE_X(G.x_mode_depth--;)
//bb_error_msg("%s: --x_mode_depth=%d", __func__, G.x_mode_depth);
return G.last_exitcode;
}