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hush: make parse errors in sourced file non-fatal in interactive script

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-03-24 05:25:59 +01:00
parent 68d5cb5dac
commit 3eab24e64a
1 changed files with 52 additions and 45 deletions
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97
shell/hush.c
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@ -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);