hush: partially fix wrong expansion on $IFS (bug 4027).
In the added testcase, before patch we failed 8 out of 9 tests, now we fail only 2 (4th and 5th). function old new delta expand_on_ifs 225 258 +33 expand_vars_to_list 1038 1054 +16 o_save_ptr_helper 115 119 +4 builtin_umask 132 133 +1 o_addQstr 165 161 -4 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 4/1 up/down: 54/-4) Total: 50 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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39
shell/hush.c
39
shell/hush.c
@ -2281,7 +2281,7 @@ static void o_addqblock(o_string *o, const char *str, int len)
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ordinary_cnt = len;
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o_addblock(o, str, ordinary_cnt);
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if (ordinary_cnt == len)
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return;
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return; /* NUL is already added by o_addblock */
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str += ordinary_cnt;
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len -= ordinary_cnt + 1; /* we are processing + 1 char below */
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@ -2295,8 +2295,8 @@ static void o_addqblock(o_string *o, const char *str, int len)
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o_grow_by(o, sz);
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o->data[o->length] = ch;
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o->length++;
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o->data[o->length] = '\0';
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}
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o->data[o->length] = '\0';
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}
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static void o_addQblock(o_string *o, const char *str, int len)
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@ -2385,6 +2385,7 @@ static int o_save_ptr_helper(o_string *o, int n)
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n, string_len, string_start);
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o->has_empty_slot = 0;
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}
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o->has_quoted_part = 0;
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list[n] = (char*)(uintptr_t)string_len;
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return n + 1;
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}
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@ -4754,8 +4755,13 @@ static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len
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static int expand_on_ifs(o_string *output, int n, const char *str)
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{
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while (1) {
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int word_len = strcspn(str, G.ifs);
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int word_len;
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if (!*str) /* EOL - do not finalize word */
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break;
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word_len = strcspn(str, G.ifs);
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if (word_len) {
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/* We have WORD_LEN leading non-IFS chars */
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if (!(output->o_expflags & EXP_FLAG_GLOB)) {
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o_addblock(output, str, word_len);
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} else {
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@ -4769,13 +4775,25 @@ static int expand_on_ifs(o_string *output, int n, const char *str)
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/*o_addqblock(output, str, word_len); - WRONG: "v='*'; echo Z$v" prints "Z*" instead of Z* files */
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}
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str += word_len;
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if (!*str) /* EOL - do not finalize word */
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break;
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goto finalize; /* optimization (can just fall thru) */
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}
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if (!*str) /* EOL - do not finalize word */
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break;
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o_addchr(output, '\0');
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debug_print_list("expand_on_ifs", output, n);
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n = o_save_ptr(output, n);
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str += strspn(str, G.ifs); /* skip ifs chars */
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/* Case "v=' a'; echo ''$v": we do need to finalize empty word */
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if (output->has_quoted_part
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/* Case "v=' a'; echo $v":
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* here nothing precedes the space in $v expansion,
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* therefore we should not finish the word
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* (IOW: if there *is* word to finalize, only then do it)
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*/
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|| (output->length && output->data[output->length - 1])
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) {
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finalize:
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o_addchr(output, '\0');
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debug_print_list("expand_on_ifs", output, n);
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n = o_save_ptr(output, n);
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}
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str += strspn(str, G.ifs); /* skip IFS chars */
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}
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debug_print_list("expand_on_ifs[1]", output, n);
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return n;
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@ -5270,11 +5288,13 @@ static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg)
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if (G.ifs[0])
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o_addchr(output, G.ifs[0]);
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}
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output->has_quoted_part = 1;
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}
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break;
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}
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case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
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/* "Empty variable", used to make "" etc to not disappear */
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output->has_quoted_part = 1;
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arg++;
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cant_be_null = 0x80;
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break;
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@ -5316,6 +5336,7 @@ static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg)
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val = NULL;
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}
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} else { /* quoted $VAR, val will be appended below */
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output->has_quoted_part = 1;
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debug_printf_expand("quoted '%s', output->o_escape:%d\n", val,
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!!(output->o_expflags & EXP_FLAG_ESC_GLOB_CHARS));
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}
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9
shell/hush_test/hush-vars/var_expand_on_ifs.right
Normal file
9
shell/hush_test/hush-vars/var_expand_on_ifs.right
Normal file
@ -0,0 +1,9 @@
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1 a b c
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2 a + b c
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3 a b c
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4 a b c
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5 a b c
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6 a b + c
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7 a b c
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8 a b c
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9 a b c
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11
shell/hush_test/hush-vars/var_expand_on_ifs.tests
Executable file
11
shell/hush_test/hush-vars/var_expand_on_ifs.tests
Executable file
@ -0,0 +1,11 @@
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b=' b '
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e=''
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echo 1 a $b c
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echo 2 a +$b c
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echo 3 a $e$b c
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echo 4 a "$e"$b c
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echo 5 a ""$b c
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echo 6 a $b+ c
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echo 7 a $b$e c
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echo 8 a $b"$e" c
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echo 9 a $b"" c
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