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hush: fix segfaulting syntax error in interactive hush

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This commit is contained in:
Denis Vlasenko 2007-05-24 13:22:47 +00:00
parent cd7f4d27a2
commit 5a1437d835
1 changed files with 29 additions and 23 deletions
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52
shell/hush.c
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@ -305,8 +305,8 @@ struct in_str {
char eof_flag; /* meaningless if ->p == NULL */
char peek_buf[2];
#if ENABLE_HUSH_INTERACTIVE
int __promptme;
int promptmode;
smallint promptme;
smallint promptmode; /* 0: PS1, 1: PS2 */
#endif
FILE *file;
int (*get) (struct in_str *);
@ -427,15 +427,23 @@ enum { run_list_level = 0 };
/* Normal */
static void syntax(const char *msg)
{
(interactive_fd ? bb_error_msg : bb_error_msg_and_die)
(msg ? "%s: %s" : "syntax error", "syntax error", msg);
/* Was using fancy stuff:
* (interactive_fd ? bb_error_msg : bb_error_msg_and_die)(...params...)
* but it SEGVs. ?! Oh well... explicit temp ptr works around that */
void (*fp)(const char *s, ...);
fp = (interactive_fd ? bb_error_msg : bb_error_msg_and_die);
fp(msg ? "%s: %s" : "syntax error", "syntax error", msg);
}
#else
/* Debug */
static void syntax_lineno(int line)
{
(interactive_fd ? bb_error_msg : bb_error_msg_and_die)
("syntax error hush.c:%d", line);
void (*fp)(const char *s, ...);
fp = (interactive_fd ? bb_error_msg : bb_error_msg_and_die);
fp("syntax error hush.c:%d", line);
}
#define syntax(str) syntax_lineno(__LINE__)
#endif
@ -1136,20 +1144,17 @@ static const char* setup_prompt_string(int promptmode)
debug_printf("setup_prompt_string %d ", promptmode);
#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
/* Set up the prompt */
if (promptmode == 1) {
char *ns;
if (promptmode == 0) { /* PS1 */
free((char*)PS1);
ns = xmalloc(strlen(cwd)+4);
sprintf(ns, "%s %s", cwd, (geteuid() != 0) ? "$ " : "# ");
prompt_str = ns;
PS1 = ns;
PS1 = xasprintf("%s %c ", cwd, (geteuid() != 0) ? '$' : '#');
prompt_str = PS1;
} else {
prompt_str = PS2;
}
#else
prompt_str = (promptmode == 1) ? PS1 : PS2;
prompt_str = (promptmode == 0) ? PS1 : PS2;
#endif
debug_printf("result %s\n", prompt_str);
debug_printf("result '%s'\n", prompt_str);
return prompt_str;
}
@ -1199,12 +1204,12 @@ static int file_get(struct in_str *i)
/* need to double check i->file because we might be doing something
* more complicated by now, like sourcing or substituting. */
#if ENABLE_HUSH_INTERACTIVE
if (interactive_fd && i->__promptme && i->file == stdin) {
if (interactive_fd && i->promptme && i->file == stdin) {
do {
get_user_input(i);
} while (!*i->p); /* need non-empty line */
i->promptmode = 2;
i->__promptme = 0;
i->promptmode = 1; /* PS2 */
i->promptme = 0;
goto take_cached;
}
#endif
@ -1213,7 +1218,7 @@ static int file_get(struct in_str *i)
debug_printf("file_get: got a '%c' %d\n", ch, ch);
#if ENABLE_HUSH_INTERACTIVE
if (ch == '\n')
i->__promptme = 1;
i->promptme = 1;
#endif
return ch;
}
@ -1243,8 +1248,8 @@ static void setup_file_in_str(struct in_str *i, FILE *f)
i->peek = file_peek;
i->get = file_get;
#if ENABLE_HUSH_INTERACTIVE
i->__promptme = 1;
i->promptmode = 1;
i->promptme = 1;
i->promptmode = 0; /* PS1 */
#endif
i->file = f;
i->p = NULL;
@ -1255,8 +1260,8 @@ static void setup_string_in_str(struct in_str *i, const char *s)
i->peek = static_peek;
i->get = static_get;
#if ENABLE_HUSH_INTERACTIVE
i->__promptme = 1;
i->promptmode = 1;
i->promptme = 1;
i->promptmode = 0; /* PS1 */
#endif
i->p = s;
i->eof_flag = 0;
@ -3246,6 +3251,7 @@ static int parse_group(o_string *dest, struct p_context *ctx,
child->subshell = 1;
}
rcode = parse_stream(dest, &sub, input, endch);
//vda: err chk?
done_word(dest, &sub); /* finish off the final word in the subcontext */
done_pipe(&sub, PIPE_SEQ); /* and the final command there, too */
child->group = sub.list_head;
@ -3588,7 +3594,7 @@ static int parse_and_run_stream(struct in_str *inp, int parse_flag)
if (!(parse_flag & PARSEFLAG_SEMICOLON) || (parse_flag & PARSEFLAG_REPARSING))
set_in_charmap(";$&|", CHAR_ORDINARY);
#if ENABLE_HUSH_INTERACTIVE
inp->promptmode = 1;
inp->promptmode = 0; /* PS1 */
#endif
/* We will stop & execute after each ';' or '\n'.
* Example: "sleep 9999; echo TEST" + ctrl-C: