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hush: fix handling of $_ (so far it's an ordinary variable, no special meaning)

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function                                             old     new   delta
parse_dollar                                         820     779     -41

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-01-25 13:20:50 +01:00
parent a497231f53
commit 0ca3198f93
1 changed files with 19 additions and 12 deletions
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29
shell/hush.c
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@ -4520,9 +4520,10 @@ static int parse_dollar(o_string *as_string,
debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
if (isalpha(ch)) {
make_var:
ch = i_getch(input);
nommu_addchr(as_string, ch);
make_var:
/*make_var1:*/
o_addchr(dest, SPECIAL_VAR_SYMBOL);
while (1) {
debug_printf_parse(": '%c'\n", ch);
@ -4715,19 +4716,22 @@ static int parse_dollar(o_string *as_string,
}
#endif
case '_':
ch = i_getch(input);
nommu_addchr(as_string, ch);
ch = i_peek_and_eat_bkslash_nl(input);
if (isalnum(ch)) { /* it's $_name or $_123 */
ch = '_';
goto make_var;
}
/* else: it's $_ */
#if 0
/* TODO: $_ and $-: */
/* $_ Shell or shell script name; or last argument of last command
* (if last command wasn't a pipe; if it was, bash sets $_ to "");
* but in command's env, set to full pathname used to invoke it */
/* $- Option flags set by set builtin or shell options (-i etc) */
ch = i_getch(input);
nommu_addchr(as_string, ch);
ch = i_peek_and_eat_bkslash_nl(input);
if (isalnum(ch)) { /* it's $_name or $_123 */
ch = '_';
goto make_var1;
}
/* else: it's $_ */
#endif
default:
o_addQchr(dest, '$');
}
@ -5669,9 +5673,9 @@ static char *replace_pattern(char *val, const char *pattern, const char *repl, c
*/
static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, char **pp)
{
const char *val = NULL;
char *to_be_freed = NULL;
char *p = *pp;
const char *val;
char *to_be_freed;
char *p;
char *var;
char first_char;
char exp_op;
@ -5680,6 +5684,9 @@ static NOINLINE const char *expand_one_var(char **to_be_freed_pp, char *arg, cha
char *exp_word = exp_word; /* for compiler */
char arg0;
val = NULL;
to_be_freed = NULL;
p = *pp;
*p = '\0'; /* replace trailing SPECIAL_VAR_SYMBOL */
var = arg;
exp_saveptr = arg[1] ? strchr(VAR_ENCODED_SUBST_OPS, arg[1]) : NULL;