typedef struct in_str {
const char *p;
- /* eof_flag=1: last char in ->p is really an EOF */
- char eof_flag; /* meaningless if ->p == NULL */
- char peek_buf[2];
#if ENABLE_HUSH_INTERACTIVE
smallint promptmode; /* 0: PS1, 1: PS2 */
#endif
+ int peek_buf[2];
int last_char;
FILE *file;
int (*get) (struct in_str *) FAST_FUNC;
int (*peek) (struct in_str *) FAST_FUNC;
} in_str;
#define i_getch(input) ((input)->get(input))
-#define i_peek(input) ((input)->peek(input))
+#define i_peek(input) ((input)->peek(input))
/* The descrip member of this structure is only used to make
* debugging output pretty */
* 1: return is invoked, skip all till end of func
*/
smallint flag_return_in_progress;
+# define G_flag_return_in_progress (G.flag_return_in_progress)
+#else
+# define G_flag_return_in_progress 0
#endif
smallint exiting; /* used to prevent EXIT trap recursion */
/* These four support $?, $#, and $1 */
int debug_indent;
#endif
struct sigaction sa;
- char user_input_buf[ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 2];
+#if ENABLE_FEATURE_EDITING
+ char user_input_buf[CONFIG_FEATURE_EDITING_MAX_LEN];
+#endif
};
#define G (*ptr_to_globals)
/* Not #defining name to G.name - this quickly gets unwieldy
break;
got_sig:
if (G.traps && G.traps[sig]) {
+ debug_printf_exec("%s: sig:%d handler:'%s'\n", __func__, sig, G.traps[sig]);
if (G.traps[sig][0]) {
/* We have user-defined handler */
smalluint save_rcode;
/* not a trap: special action */
switch (sig) {
case SIGINT:
+ debug_printf_exec("%s: sig:%d default SIGINT handler\n", __func__, sig);
/* Builtin was ^C'ed, make it look prettier: */
bb_putchar('\n');
G.flag_SIGINT = 1;
#if ENABLE_HUSH_JOB
case SIGHUP: {
struct pipe *job;
+ debug_printf_exec("%s: sig:%d default SIGHUP handler\n", __func__, sig);
/* bash is observed to signal whole process groups,
* not individual processes */
for (job = G.job_list; job; job = job->next) {
#endif
#if ENABLE_HUSH_FAST
case SIGCHLD:
+ debug_printf_exec("%s: sig:%d default SIGCHLD handler\n", __func__, sig);
G.count_SIGCHLD++;
//bb_error_msg("[%d] check_and_run_traps: G.count_SIGCHLD:%d G.handled_SIGCHLD:%d", getpid(), G.count_SIGCHLD, G.handled_SIGCHLD);
/* Note:
break;
#endif
default: /* ignored: */
+ debug_printf_exec("%s: sig:%d default handling is to ignore\n", __func__, sig);
/* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */
/* Note:
* We dont do 'last_sig = sig' here -> NOT returning this sig.
}
}
-
/*
- * in_str support
+ * in_str support (strings, and "strings" read from files).
*/
-static int FAST_FUNC static_get(struct in_str *i)
-{
- int ch = *i->p;
- if (ch != '\0') {
- i->p++;
- i->last_char = ch;
- return ch;
- }
- return EOF;
-}
-
-static int FAST_FUNC static_peek(struct in_str *i)
-{
- return *i->p;
-}
#if ENABLE_HUSH_INTERACTIVE
-
+/* To test correct lineedit/interactive behavior, type from command line:
+ * echo $P\
+ * \
+ * AT\
+ * H\
+ * \
+ * It excercises a lot of corner cases.
+ */
static void cmdedit_update_prompt(void)
{
if (ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
if (G.PS2 == NULL)
G.PS2 = "> ";
}
-
static const char *setup_prompt_string(int promptmode)
{
const char *prompt_str;
prompt_str = G.PS2;
} else
prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
- debug_printf("result '%s'\n", prompt_str);
+ debug_printf("prompt_str '%s'\n", prompt_str);
return prompt_str;
}
-
-static void get_user_input(struct in_str *i)
+static int get_user_input(struct in_str *i)
{
int r;
const char *prompt_str;
prompt_str = setup_prompt_string(i->promptmode);
# if ENABLE_FEATURE_EDITING
- /* Enable command line editing only while a command line
- * is actually being read */
do {
reinit_unicode_for_hush();
G.flag_SIGINT = 0;
/* buglet: SIGINT will not make new prompt to appear _at once_,
* only after <Enter>. (^C will work) */
- r = read_line_input(G.line_input_state, prompt_str, G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1, /*timeout*/ -1);
+ r = read_line_input(G.line_input_state, prompt_str,
+ G.user_input_buf, CONFIG_FEATURE_EDITING_MAX_LEN-1,
+ /*timeout*/ -1
+ );
/* catch *SIGINT* etc (^C is handled by read_line_input) */
check_and_run_traps();
} while (r == 0 || G.flag_SIGINT); /* repeat if ^C or SIGINT */
- i->eof_flag = (r < 0);
- if (i->eof_flag) { /* EOF/error detected */
- G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
- G.user_input_buf[1] = '\0';
+ if (r < 0) {
+ /* EOF/error detected */
+ i->p = NULL;
+ i->peek_buf[0] = r = EOF;
+ return r;
}
+ i->p = G.user_input_buf;
+ return (unsigned char)*i->p++;
# else
do {
G.flag_SIGINT = 0;
fputs(prompt_str, stdout);
}
fflush_all();
- G.user_input_buf[0] = r = fgetc(i->file);
- /*G.user_input_buf[1] = '\0'; - already is and never changed */
- } while (G.flag_SIGINT);
- i->eof_flag = (r == EOF);
+ r = fgetc(i->file);
+ } while (G.flag_SIGINT || r == '\0');
+ return r;
# endif
- i->p = G.user_input_buf;
}
-
-#endif /* INTERACTIVE */
-
/* This is the magic location that prints prompts
* and gets data back from the user */
+static int fgetc_interactive(struct in_str *i)
+{
+ int ch;
+ /* If it's interactive stdin, get new line. */
+ if (G_interactive_fd && i->file == stdin) {
+ /* Returns first char (or EOF), the rest is in i->p[] */
+ ch = get_user_input(i);
+ i->promptmode = 1; /* PS2 */
+ } else {
+ /* Not stdin: script file, sourced file, etc */
+ do ch = fgetc(i->file); while (ch == '\0');
+ }
+ return ch;
+}
+#else
+static inline int fgetc_interactive(struct in_str *i)
+{
+ int ch;
+ do ch = fgetc(i->file); while (ch == '\0');
+ return ch;
+}
+#endif /* INTERACTIVE */
+
static int FAST_FUNC file_get(struct in_str *i)
{
int ch;
- /* If there is data waiting, eat it up */
- if (i->p && *i->p) {
-#if ENABLE_HUSH_INTERACTIVE
- take_cached:
-#endif
- ch = *i->p++;
- if (i->eof_flag && !*i->p)
- ch = EOF;
- /* note: ch is never NUL */
- } else {
- /* 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 (G_interactive_fd && i->file == stdin) {
- do {
- get_user_input(i);
- } while (!*i->p); /* need non-empty line */
- i->promptmode = 1; /* PS2 */
- goto take_cached;
- }
+#if ENABLE_FEATURE_EDITING
+ /* This can be stdin, check line editing char[] buffer */
+ if (i->p && *i->p != '\0') {
+ ch = (unsigned char)*i->p++;
+ goto out;
+ }
#endif
- do ch = fgetc(i->file); while (ch == '\0');
+ /* peek_buf[] is an int array, not char. Can contain EOF. */
+ ch = i->peek_buf[0];
+ if (ch != 0) {
+ int ch2 = i->peek_buf[1];
+ i->peek_buf[0] = ch2;
+ if (ch2 == 0) /* very likely, avoid redundant write */
+ goto out;
+ i->peek_buf[1] = 0;
+ goto out;
}
+
+ ch = fgetc_interactive(i);
+ out:
debug_printf("file_get: got '%c' %d\n", ch, ch);
i->last_char = ch;
return ch;
}
-/* All callers guarantee this routine will never
- * be used right after a newline, so prompting is not needed.
- */
static int FAST_FUNC file_peek(struct in_str *i)
{
int ch;
- if (i->p && *i->p) {
- if (i->eof_flag && !i->p[1])
- return EOF;
- return *i->p;
- /* note: ch is never NUL */
+
+#if ENABLE_FEATURE_EDITING && ENABLE_HUSH_INTERACTIVE
+ /* This can be stdin, check line editing char[] buffer */
+ if (i->p && *i->p != '\0')
+ return (unsigned char)*i->p;
+#endif
+ /* peek_buf[] is an int array, not char. Can contain EOF. */
+ ch = i->peek_buf[0];
+ if (ch != 0)
+ return ch;
+
+ /* Need to get a new char */
+ ch = fgetc_interactive(i);
+ debug_printf("file_peek: got '%c' %d\n", ch, ch);
+
+ /* Save it by either rolling back line editing buffer, or in i->peek_buf[0] */
+#if ENABLE_FEATURE_EDITING && ENABLE_HUSH_INTERACTIVE
+ if (i->p) {
+ i->p -= 1;
+ return ch;
}
- do ch = fgetc(i->file); while (ch == '\0');
- i->eof_flag = (ch == EOF);
+#endif
i->peek_buf[0] = ch;
- i->peek_buf[1] = '\0';
- i->p = i->peek_buf;
- debug_printf("file_peek: got '%c' %d\n", ch, ch);
+ /*i->peek_buf[1] = 0; - already is */
+ return ch;
+}
+
+static int FAST_FUNC static_get(struct in_str *i)
+{
+ int ch = (unsigned char)*i->p;
+ if (ch != '\0') {
+ i->p++;
+ i->last_char = ch;
+ return ch;
+ }
+ return EOF;
+}
+
+static int FAST_FUNC static_peek(struct in_str *i)
+{
+ /* Doesn't report EOF on NUL. None of the callers care. */
+ return (unsigned char)*i->p;
+}
+
+/* Only ever called if i_peek() was called, and did not return EOF.
+ * IOW: we know the previous peek saw an ordinary char, not EOF, not NUL,
+ * not end-of-line. Therefore we never need to read a new editing line here.
+ */
+static int i_peek2(struct in_str *i)
+{
+ int ch;
+
+ /* There are two cases when i->p[] buffer exists.
+ * (1) it's a string in_str.
+ * (2) It's a file, and we have a saved line editing buffer.
+ * In both cases, we know that i->p[0] exists and not NUL, and
+ * the peek2 result is in i->p[1].
+ */
+ if (i->p)
+ return (unsigned char)i->p[1];
+
+ /* Now we know it is a file-based in_str. */
+
+ /* peek_buf[] is an int array, not char. Can contain EOF. */
+ /* Is there 2nd char? */
+ ch = i->peek_buf[1];
+ if (ch == 0) {
+ /* We did not read it yet, get it now */
+ do ch = fgetc(i->file); while (ch == '\0');
+ i->peek_buf[1] = ch;
+ }
+
+ debug_printf("file_peek2: got '%c' %d\n", ch, ch);
return ch;
}
static void setup_file_in_str(struct in_str *i, FILE *f)
{
memset(i, 0, sizeof(*i));
- i->peek = file_peek;
i->get = file_get;
+ i->peek = file_peek;
/* i->promptmode = 0; - PS1 (memset did it) */
i->file = f;
/* i->p = NULL; */
static void setup_string_in_str(struct in_str *i, const char *s)
{
memset(i, 0, sizeof(*i));
- i->peek = static_peek;
i->get = static_get;
+ i->peek = static_peek;
/* i->promptmode = 0; - PS1 (memset did it) */
i->p = s;
- /* i->eof_flag = 0; */
}
static void o_grow_by(o_string *o, int len)
{
if (o->length + len > o->maxlen) {
- o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
+ o->maxlen += (2 * len) | (B_CHUNK-1);
o->data = xrealloc(o->data, 1 + o->maxlen);
}
}
static void o_addchr(o_string *o, int ch)
{
debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
+ if (o->length < o->maxlen) {
+ /* likely. avoid o_grow_by() call */
+ add:
+ o->data[o->length] = ch;
+ o->length++;
+ o->data[o->length] = '\0';
+ return;
+ }
o_grow_by(o, 1);
- o->data[o->length] = ch;
- o->length++;
+ goto add;
+}
+
+#if 0
+/* Valid only if we know o_string is not empty */
+static void o_delchr(o_string *o)
+{
+ o->length--;
o->data[o->length] = '\0';
}
+#endif
static void o_addblock(o_string *o, const char *str, int len)
{
/* command remains "open", available for possible redirects */
}
+static int i_getch_and_eat_bkslash_nl(struct in_str *input)
+{
+ for (;;) {
+ int ch, ch2;
+
+ ch = i_getch(input);
+ if (ch != '\\')
+ return ch;
+ ch2 = i_peek(input);
+ if (ch2 != '\n')
+ return ch;
+ /* backslash+newline, skip it */
+ i_getch(input);
+ }
+}
+
+static int i_peek_and_eat_bkslash_nl(struct in_str *input)
+{
+ for (;;) {
+ int ch, ch2;
+
+ ch = i_peek(input);
+ if (ch != '\\')
+ return ch;
+ ch2 = i_peek2(input);
+ if (ch2 != '\n')
+ return ch;
+ /* backslash+newline, skip it */
+ i_getch(input);
+ i_getch(input);
+ }
+}
+
#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_DOLLAR_OPS
/* Subroutines for copying $(...) and `...` things */
static int add_till_backquote(o_string *dest, struct in_str *input, int in_dquote);
if (!dbl)
break;
/* we look for closing )) of $((EXPR)) */
- if (i_peek(input) == end_ch) {
+ if (i_peek_and_eat_bkslash_nl(input) == end_ch) {
i_getch(input); /* eat second ')' */
break;
}
syntax_error_unterm_ch(')');
return 0;
}
+#if 0
+ if (ch == '\n') {
+ /* "backslash+newline", ignore both */
+ o_delchr(dest); /* undo insertion of '\' */
+ continue;
+ }
+#endif
o_addchr(dest, ch);
continue;
}
o_string *dest,
struct in_str *input, unsigned char quote_mask)
{
- int ch = i_peek(input); /* first character after the $ */
+ int ch = i_peek_and_eat_bkslash_nl(input); /* first character after the $ */
debug_printf_parse("parse_dollar entered: ch='%c'\n", ch);
if (isalpha(ch)) {
debug_printf_parse(": '%c'\n", ch);
o_addchr(dest, ch | quote_mask);
quote_mask = 0;
- ch = i_peek(input);
- if (!isalnum(ch) && ch != '_')
+ ch = i_peek_and_eat_bkslash_nl(input);
+ if (!isalnum(ch) && ch != '_') {
+ /* End of variable name reached */
break;
+ }
ch = i_getch(input);
nommu_addchr(as_string, ch);
}
ch = i_getch(input); /* eat '{' */
nommu_addchr(as_string, ch);
- ch = i_getch(input); /* first char after '{' */
+ ch = i_getch_and_eat_bkslash_nl(input); /* first char after '{' */
/* It should be ${?}, or ${#var},
* or even ${?+subst} - operator acting on a special variable,
* or the beginning of variable name.
ch = i_getch(input);
nommu_addchr(as_string, ch);
# if ENABLE_SH_MATH_SUPPORT
- if (i_peek(input) == '(') {
+ if (i_peek_and_eat_bkslash_nl(input) == '(') {
ch = i_getch(input);
nommu_addchr(as_string, ch);
o_addchr(dest, SPECIAL_VAR_SYMBOL);
case '_':
ch = i_getch(input);
nommu_addchr(as_string, ch);
- ch = i_peek(input);
+ ch = i_peek_and_eat_bkslash_nl(input);
if (isalnum(ch)) { /* it's $_name or $_123 */
ch = '_';
goto make_var;
n++;
}
}
- overlapping_strcpy((char*)list, list[0]);
+ overlapping_strcpy((char*)list, list[0] ? list[0] : "");
debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
return (char*)list;
}
debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
run_and_free_list(pipe_list);
empty = 0;
-#if ENABLE_HUSH_FUNCTIONS
- if (G.flag_return_in_progress == 1)
+ if (G_flag_return_in_progress == 1)
break;
-#endif
}
}
save_and_replace_G_args(&sv, argv);
/* "we are in function, ok to use return" */
- sv_flg = G.flag_return_in_progress;
- G.flag_return_in_progress = -1;
+ sv_flg = G_flag_return_in_progress;
+ G_flag_return_in_progress = -1;
# if ENABLE_HUSH_LOCAL
G.func_nest_level++;
# endif
G.func_nest_level--;
}
# endif
- G.flag_return_in_progress = sv_flg;
+ G_flag_return_in_progress = sv_flg;
restore_G_args(&sv, argv);
for (; pi; pi = IF_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
if (G.flag_SIGINT)
break;
+ if (G_flag_return_in_progress == 1)
+ break;
IF_HAS_KEYWORDS(rword = pi->res_word;)
debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n",
continue;
}
#endif
-#if ENABLE_HUSH_FUNCTIONS
- if (G.flag_return_in_progress == 1) {
+ if (G_flag_return_in_progress == 1) {
checkjobs(NULL);
break;
}
-#endif
} else if (pi->followup == PIPE_BG) {
/* What does bash do with attempts to background builtins? */
/* even bash 3.2 doesn't do that well with nested bg:
int msh_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int msh_main(int argc, char **argv)
{
- //bb_error_msg("msh is deprecated, please use hush instead");
+ bb_error_msg("msh is deprecated, please use hush instead");
return hush_main(argc, argv);
}
#endif
}
#if ENABLE_HUSH_FUNCTIONS
- sv_flg = G.flag_return_in_progress;
+ sv_flg = G_flag_return_in_progress;
/* "we are inside sourced file, ok to use return" */
- G.flag_return_in_progress = -1;
+ G_flag_return_in_progress = -1;
#endif
if (argv[1])
save_and_replace_G_args(&sv, argv);
if (argv[1])
restore_G_args(&sv, argv);
#if ENABLE_HUSH_FUNCTIONS
- G.flag_return_in_progress = sv_flg;
+ G_flag_return_in_progress = sv_flg;
#endif
return G.last_exitcode;
{
int rc;
- if (G.flag_return_in_progress != -1) {
+ if (G_flag_return_in_progress != -1) {
bb_error_msg("%s: not in a function or sourced script", argv[0]);
return EXIT_FAILURE; /* bash compat */
}
- G.flag_return_in_progress = 1;
+ G_flag_return_in_progress = 1;
/* bash:
* out of range: wraps around at 256, does not error out
projects / oweals / busybox.git / blobdiff