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Optionally return signal type when got a signal

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This commit is contained in:
abitmore 2019-05-06 11:07:19 -04:00
parent ee176c80d7
commit 2b75e9eba4
2 changed files with 37 additions and 6 deletions
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6
include/editline.h
View File

@ -90,6 +90,12 @@ extern int el_no_echo; /* E.g under emacs, don't echo except prompt */
extern int el_no_hist; /* Disable auto-save of and access to history -- e.g. for password prompts or wizards */
extern int el_hist_size; /* size of history scrollback buffer, default: 15 */
extern int el_ret_signals; /* Set this to non-zero to enable use of following constants. Disabled by default.
The constants can be returned by readline(), or be used as callback_handler's parameter.
The caller can not free the constants. */
extern const char* const el_ret_sigint; /* If got SIGINT from tty, readline will return this if el_ret_signals is non zero */
extern const char* const el_ret_sigtstp; /* If got SIGTSTP from tty, readline will return this if el_ret_signals is non zero */
extern void rl_initialize (void);
extern void rl_reset_terminal (const char *terminal_name);
extern void rl_uninitialize (void);

37
src/editline.c
View File

@ -114,6 +114,10 @@ static const char *(*search_move)(void);
static const char *old_prompt = NULL;
static rl_vcpfunc_t *line_handler = NULL;
int el_ret_signals = 0; /* return an empty string by default when got a signal */
const char* const el_ret_sigint = "^C";
const char* const el_ret_sigtstp = "^Z";
int el_no_echo = 0; /* e.g., under Emacs */
int el_no_hist = 0;
int rl_point;
@ -686,7 +690,9 @@ static el_status_t h_search_end(const char *p)
rl_prompt = old_prompt;
Searching = 0;
if (p == NULL && el_intr_pending > 0) {
/* When got a signal, editinput() will either return an empty string, or NULL, or a constant,
none of them makes sense to search with. And we always need to clear el_intr_pending. */
if (el_intr_pending > 0) {
el_intr_pending = 0;
clear_line();
return redisplay();
@ -1069,6 +1075,23 @@ static el_status_t tty_special(int c)
return CSdispatch;
}
static int is_signal(char* line)
{
return (line == el_ret_sigint || line == el_ret_sigtstp);
}
static char* get_signal_str()
{
if (el_ret_signals)
{
if (el_intr_pending == SIGINT)
return el_ret_sigint;
if (el_intr_pending == SIGTSTP)
return el_ret_sigtstp;
}
return (char *)"";
}
static char *editinput(int complete)
{
int c;
@ -1086,7 +1109,7 @@ static char *editinput(int complete)
return NULL;
case CSsignal:
return (char *)"";
return get_signal_str();
case CSmove:
reposition();
@ -1101,7 +1124,7 @@ static char *editinput(int complete)
return NULL;
case CSsignal:
return (char *)"";
return get_signal_str();
case CSmove:
reposition();
@ -1350,7 +1373,8 @@ static int el_prep(const char *prompt)
static char *el_deprep(char *line)
{
if (line) {
line = strdup(line);
if (!is_signal(line))
line = strdup(line);
tty_puts(NEWLINE);
tty_flush();
}
@ -1366,7 +1390,7 @@ static char *el_deprep(char *line)
/* Add to history, unless no-echo or no-history mode ... */
if (!el_no_echo && !el_no_hist) {
if (line != NULL && *line != '\0')
if (line != NULL && *line != '\0' && !is_signal(line))
hist_add(line);
}
@ -1436,7 +1460,8 @@ void rl_callback_read_char(void)
}
l = el_deprep(line);
line_handler(l);
line_handler(l); /* l can be el_ret_sigint or el_ret_sigtstp,
in this case the callback function can not free it */
if (el_prep(rl_prompt))
line_handler(NULL);