[git commit master 1/1] hush: make parse errors in sourced file non-fatal in interactive script
Denys Vlasenko
vda.linux at googlemail.com
Thu Mar 24 04:25:59 UTC 2011
commit: http://git.busybox.net/busybox/commit/?id=3eab24e64a65746ed9fcc5bed3e9a19a489b0573
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
shell/hush.c | 97 +++++++++++++++++++++++++++++++---------------------------
1 files changed, 52 insertions(+), 45 deletions(-)
diff --git a/shell/hush.c b/shell/hush.c
index 8154ac4..e4c3a7d 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -1095,17 +1095,10 @@ static void syntax_error_unterm_str(unsigned lineno, const char *s)
die_if_script(lineno, "syntax error: unterminated %s", s);
}
-/* It so happens that all such cases are totally fatal
- * even if shell is interactive: EOF while looking for closing
- * delimiter. There is nowhere to read stuff from after that,
- * it's EOF! The only choice is to terminate.
- */
-static void syntax_error_unterm_ch(unsigned lineno, char ch) NORETURN;
static void syntax_error_unterm_ch(unsigned lineno, char ch)
{
char msg[2] = { ch, '\0' };
syntax_error_unterm_str(lineno, msg);
- xfunc_die();
}
static void syntax_error_unexpected_ch(unsigned lineno, int ch)
@@ -3539,39 +3532,40 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS
/* Subroutines for copying $(...) and `...` things */
-static void add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
+static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
/* '...' */
-static void add_till_single_quote(o_string *dest, struct in_str *input)
+static int add_till_single_quote(o_string *dest, struct in_str *input)
{
while (1) {
int ch = i_getch(input);
if (ch == EOF) {
syntax_error_unterm_ch('\'');
- /*xfunc_die(); - redundant */
+ return 0;
}
if (ch == '\'')
- return;
+ return 1;
o_addchr(dest, ch);
}
}
/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
-static void add_till_double_quote(o_string *dest, struct in_str *input)
+static int add_till_double_quote(o_string *dest, struct in_str *input)
{
while (1) {
int ch = i_getch(input);
if (ch == EOF) {
syntax_error_unterm_ch('"');
- /*xfunc_die(); - redundant */
+ return 0;
}
if (ch == '"')
- return;
+ return 1;
if (ch == '\\') { /* \x. Copy both chars. */
o_addchr(dest, ch);
ch = i_getch(input);
}
o_addchr(dest, ch);
if (ch == '`') {
- add_till_backquote(dest, input, /*in_dquote:*/ 1);
+ if (!add_till_backquote(dest, input, /*in_dquote:*/ 1))
+ return 0;
o_addchr(dest, ch);
continue;
}
@@ -3592,12 +3586,12 @@ static void add_till_double_quote(o_string *dest, struct in_str *input)
* Example Output
* echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
*/
-static void add_till_backquote(o_string *dest, struct in_str *input, int in_dquote)
+static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote)
{
while (1) {
int ch = i_getch(input);
if (ch == '`')
- return;
+ return 1;
if (ch == '\\') {
/* \x. Copy both unless it is \`, \$, \\ and maybe \" */
ch = i_getch(input);
@@ -3611,7 +3605,7 @@ static void add_till_backquote(o_string *dest, struct in_str *input, int in_dquo
}
if (ch == EOF) {
syntax_error_unterm_ch('`');
- /*xfunc_die(); - redundant */
+ return 0;
}
o_addchr(dest, ch);
}
@@ -3647,7 +3641,7 @@ static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsign
ch = i_getch(input);
if (ch == EOF) {
syntax_error_unterm_ch(end_ch);
- /*xfunc_die(); - redundant */
+ return 0;
}
if (ch == end_ch IF_HUSH_BASH_COMPAT( || ch == end_char2)) {
if (!dbl)
@@ -3661,22 +3655,26 @@ static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsign
o_addchr(dest, ch);
if (ch == '(' || ch == '{') {
ch = (ch == '(' ? ')' : '}');
- add_till_closing_bracket(dest, input, ch);
+ if (!add_till_closing_bracket(dest, input, ch))
+ return 0;
o_addchr(dest, ch);
continue;
}
if (ch == '\'') {
- add_till_single_quote(dest, input);
+ if (!add_till_single_quote(dest, input))
+ return 0;
o_addchr(dest, ch);
continue;
}
if (ch == '"') {
- add_till_double_quote(dest, input);
+ if (!add_till_double_quote(dest, input))
+ return 0;
o_addchr(dest, ch);
continue;
}
if (ch == '`') {
- add_till_backquote(dest, input, /*in_dquote:*/ 0);
+ if (!add_till_backquote(dest, input, /*in_dquote:*/ 0))
+ return 0;
o_addchr(dest, ch);
continue;
}
@@ -3685,7 +3683,7 @@ static int add_till_closing_bracket(o_string *dest, struct in_str *input, unsign
ch = i_getch(input);
if (ch == EOF) {
syntax_error_unterm_ch(')');
- /*xfunc_die(); - redundant */
+ return 0;
}
o_addchr(dest, ch);
continue;
@@ -3756,8 +3754,8 @@ static int parse_dollar(o_string *as_string,
) {
bad_dollar_syntax:
syntax_error_unterm_str("${name}");
- debug_printf_parse("parse_dollar return 1: unterminated ${name}\n");
- return 1;
+ debug_printf_parse("parse_dollar return 0: unterminated ${name}\n");
+ return 0;
}
nommu_addchr(as_string, ch);
ch |= quote_mask;
@@ -3813,6 +3811,8 @@ static int parse_dollar(o_string *as_string,
pos = dest->length;
#if ENABLE_HUSH_DOLLAR_OPS
last_ch = add_till_closing_bracket(dest, input, end_ch);
+ if (last_ch == 0) /* error? */
+ return 0;
#else
#error Simple code to only allow ${var} is not implemented
#endif
@@ -3857,7 +3857,8 @@ static int parse_dollar(o_string *as_string,
o_addchr(dest, /*quote_mask |*/ '+');
if (!BB_MMU)
pos = dest->length;
- add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG);
+ if (!add_till_closing_bracket(dest, input, ')' | DOUBLE_CLOSE_CHAR_FLAG))
+ return 0; /* error */
if (as_string) {
o_addstr(as_string, dest->data + pos);
o_addchr(as_string, ')');
@@ -3872,7 +3873,8 @@ static int parse_dollar(o_string *as_string,
o_addchr(dest, quote_mask | '`');
if (!BB_MMU)
pos = dest->length;
- add_till_closing_bracket(dest, input, ')');
+ if (!add_till_closing_bracket(dest, input, ')'))
+ return 0; /* error */
if (as_string) {
o_addstr(as_string, dest->data + pos);
o_addchr(as_string, ')');
@@ -3899,8 +3901,8 @@ static int parse_dollar(o_string *as_string,
default:
o_addQchr(dest, '$');
}
- debug_printf_parse("parse_dollar return 0\n");
- return 0;
+ debug_printf_parse("parse_dollar return 1 (ok)\n");
+ return 1;
#undef as_string
}
@@ -3941,13 +3943,13 @@ static int encode_string(o_string *as_string,
if (ch != EOF)
nommu_addchr(as_string, ch);
if (ch == dquote_end) { /* may be only '"' or EOF */
- debug_printf_parse("encode_string return 0\n");
- return 0;
+ debug_printf_parse("encode_string return 1 (ok)\n");
+ return 1;
}
/* note: can't move it above ch == dquote_end check! */
if (ch == EOF) {
syntax_error_unterm_ch('"');
- /*xfunc_die(); - redundant */
+ return 0; /* error */
}
next = '\0';
if (ch != '\n') {
@@ -3978,10 +3980,10 @@ static int encode_string(o_string *as_string,
goto again;
}
if (ch == '$') {
- if (parse_dollar(as_string, dest, input, /*quote_mask:*/ 0x80) != 0) {
- debug_printf_parse("encode_string return 1: "
- "parse_dollar returned non-0\n");
- return 1;
+ if (!parse_dollar(as_string, dest, input, /*quote_mask:*/ 0x80)) {
+ debug_printf_parse("encode_string return 0: "
+ "parse_dollar returned 0 (error)\n");
+ return 0;
}
goto again;
}
@@ -3990,7 +3992,8 @@ static int encode_string(o_string *as_string,
//unsigned pos = dest->length;
o_addchr(dest, SPECIAL_VAR_SYMBOL);
o_addchr(dest, 0x80 | '`');
- add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"');
+ if (!add_till_backquote(dest, input, /*in_dquote:*/ dquote_end == '"'))
+ return 0; /* error */
o_addchr(dest, SPECIAL_VAR_SYMBOL);
//debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
goto again;
@@ -4061,8 +4064,8 @@ static struct pipe *parse_stream(char **pstring,
/* end_trigger == '}' case errors out earlier,
* checking only ')' */
if (end_trigger == ')') {
- syntax_error_unterm_ch('('); /* exits */
- /* goto parse_error; */
+ syntax_error_unterm_ch('(');
+ goto parse_error;
}
if (done_word(&dest, &ctx)) {
@@ -4353,9 +4356,9 @@ static struct pipe *parse_stream(char **pstring,
dest.has_quoted_part = 1;
break;
case '$':
- if (parse_dollar(&ctx.as_string, &dest, input, /*quote_mask:*/ 0) != 0) {
+ if (!parse_dollar(&ctx.as_string, &dest, input, /*quote_mask:*/ 0)) {
debug_printf_parse("parse_stream parse error: "
- "parse_dollar returned non-0\n");
+ "parse_dollar returned 0 (error)\n");
goto parse_error;
}
break;
@@ -4365,7 +4368,7 @@ static struct pipe *parse_stream(char **pstring,
ch = i_getch(input);
if (ch == EOF) {
syntax_error_unterm_ch('\'');
- /*xfunc_die(); - redundant */
+ goto parse_error;
}
nommu_addchr(&ctx.as_string, ch);
if (ch == '\'')
@@ -4377,7 +4380,7 @@ static struct pipe *parse_stream(char **pstring,
dest.has_quoted_part = 1;
if (dest.o_assignment == NOT_ASSIGNMENT)
dest.o_expflags |= EXP_FLAG_ESC_GLOB_CHARS;
- if (encode_string(&ctx.as_string, &dest, input, '"', /*process_bkslash:*/ 1))
+ if (!encode_string(&ctx.as_string, &dest, input, '"', /*process_bkslash:*/ 1))
goto parse_error;
dest.o_expflags &= ~EXP_FLAG_ESC_GLOB_CHARS;
break;
@@ -4388,7 +4391,8 @@ static struct pipe *parse_stream(char **pstring,
o_addchr(&dest, SPECIAL_VAR_SYMBOL);
o_addchr(&dest, '`');
pos = dest.length;
- add_till_backquote(&dest, input, /*in_dquote:*/ 0);
+ if (!add_till_backquote(&dest, input, /*in_dquote:*/ 0))
+ goto parse_error;
# if !BB_MMU
o_addstr(&ctx.as_string, dest.data + pos);
o_addchr(&ctx.as_string, '`');
@@ -4664,6 +4668,7 @@ static char *encode_then_expand_string(const char *str, int process_bkslash, int
*/
setup_string_in_str(&input, str);
encode_string(NULL, &dest, &input, EOF, process_bkslash);
+//TODO: error check (encode_string returns 0 on error)?
//bb_error_msg("'%s' -> '%s'", str, dest.data);
exp_str = expand_string_to_string(dest.data, /*unbackslash:*/ do_unbackslash);
//bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
@@ -8625,6 +8630,8 @@ static int FAST_FUNC builtin_source(char **argv)
#endif
save_and_replace_G_args(&sv, argv);
+//TODO: syntax errors in sourced file should never abort the "calling" script.
+//Try: bash -c '. ./bad_file; echo YES'
parse_and_run_file(input);
fclose(input);
--
1.7.3.4
More information about the busybox-cvs
mailing list