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-rw-r--r--shell/cmdedit.c162
1 files changed, 62 insertions, 100 deletions
diff --git a/shell/cmdedit.c b/shell/cmdedit.c
index eee32131a..b6e743eb4 100644
--- a/shell/cmdedit.c
+++ b/shell/cmdedit.c
@@ -89,22 +89,17 @@
#endif /* advanced FEATURES */
-
-struct history {
- char *s;
- struct history *p;
- struct history *n;
-};
-
/* Maximum length of the linked list for the command line history */
-static const int MAX_HISTORY = 15;
-
-/* First element in command line list */
-static struct history *his_front = NULL;
-
-/* Last element in command line list */
-static struct history *his_end = NULL;
-
+#define MAX_HISTORY 15
+#if MAX_HISTORY < 1
+#warning cmdedit: You set MAX_HISTORY < 1. The history algorithm switched off.
+#else
+static char *history[MAX_HISTORY+1]; /* history + current */
+/* saved history lines */
+static int n_history;
+/* current pointer to history line */
+static int cur_history;
+#endif
#include <termios.h>
#define setTermSettings(fd,argp) tcsetattr(fd,TCSANOW,argp)
@@ -116,7 +111,6 @@ static struct termios initial_settings, new_settings;
static
volatile int cmdedit_termw = 80; /* actual terminal width */
-static int history_counter = 0; /* Number of commands in history list */
static
volatile int handlers_sets = 0; /* Set next bites: */
@@ -148,7 +142,7 @@ static int my_euid;
#endif
#ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
-static char *hostname_buf = "";
+static char *hostname_buf;
static int num_ok_lines = 1;
#endif
@@ -207,19 +201,6 @@ static void cmdedit_reset_term(void)
handlers_sets &= ~SET_WCHG_HANDLERS;
}
fflush(stdout);
-#if 0
-//#ifdef CONFIG_FEATURE_CLEAN_UP
- if (his_front) {
- struct history *n;
-
- while (his_front != his_end) {
- n = his_front->n;
- free(his_front->s);
- free(his_front);
- his_front = n;
- }
- }
-#endif
}
@@ -368,7 +349,7 @@ static void parse_prompt(const char *prmt_ptr)
#endif
case 'h':
pbuf = hostname_buf;
- if (*pbuf == 0) {
+ if (pbuf == 0) {
pbuf = xcalloc(256, 1);
if (gethostname(pbuf, 255) < 0) {
strcpy(pbuf, "?");
@@ -1122,18 +1103,29 @@ static void input_tab(int *lastWasTab)
}
#endif /* CONFIG_FEATURE_COMMAND_TAB_COMPLETION */
-static void get_previous_history(struct history **hp, struct history *p)
+#if MAX_HISTORY >= 1
+static void get_previous_history(void)
{
- if ((*hp)->s)
- free((*hp)->s);
- (*hp)->s = xstrdup(command_ps);
- *hp = p;
+ if(command_ps[0] != 0 || history[cur_history] == 0) {
+ free(history[cur_history]);
+ history[cur_history] = xstrdup(command_ps);
+ }
+ cur_history--;
}
-static inline void get_next_history(struct history **hp)
+static int get_next_history(void)
{
- get_previous_history(hp, (*hp)->n);
+ int ch = cur_history;
+
+ if (ch < n_history) {
+ get_previous_history(); /* save the current history line */
+ return (cur_history = ch+1);
+ } else {
+ beep();
+ return 0;
+ }
}
+#endif
enum {
ESC = 27,
@@ -1165,7 +1157,6 @@ int cmdedit_read_input(char *prompt, char command[BUFSIZ])
int break_out = 0;
int lastWasTab = FALSE;
unsigned char c = 0;
- struct history *hp = his_end;
/* prepare before init handlers */
cmdedit_y = 0; /* quasireal y, not true work if line > xt*yt */
@@ -1271,31 +1262,26 @@ prepare_to_die:
printf("\033[J");
break;
case 12:
- {
/* Control-l -- clear screen */
- int old_cursor = cursor;
printf("\033[H");
- redraw(0, len-old_cursor);
- }
+ redraw(0, len-cursor);
break;
+#if MAX_HISTORY >= 1
case 14:
/* Control-n -- Get next command in history */
- if (hp && hp->n && hp->n->s) {
- get_next_history(&hp);
+ if (get_next_history())
goto rewrite_line;
- } else {
- beep();
- }
break;
case 16:
/* Control-p -- Get previous command from history */
- if (hp && hp->p) {
- get_previous_history(&hp, hp->p);
+ if (cur_history > 0) {
+ get_previous_history();
goto rewrite_line;
} else {
beep();
}
break;
+#endif
case 21:
/* Control-U -- Clear line before cursor */
if (cursor) {
@@ -1319,10 +1305,11 @@ prepare_to_die:
input_tab(&lastWasTab);
break;
#endif
+#if MAX_HISTORY >= 1
case 'A':
/* Up Arrow -- Get previous command from history */
- if (hp && hp->p) {
- get_previous_history(&hp, hp->p);
+ if (cur_history > 0) {
+ get_previous_history();
goto rewrite_line;
} else {
beep();
@@ -1330,21 +1317,16 @@ prepare_to_die:
break;
case 'B':
/* Down Arrow -- Get next command in history */
- if (hp && hp->n && hp->n->s) {
- get_next_history(&hp);
- goto rewrite_line;
- } else {
- beep();
- }
+ if (!get_next_history())
break;
-
/* Rewrite the line with the selected history item */
- rewrite_line:
+rewrite_line:
/* change command */
- len = strlen(strcpy(command, hp->s));
+ len = strlen(strcpy(command, history[cur_history]));
/* redraw and go to end line */
redraw(cmdedit_y, 0);
break;
+#endif
case 'C':
/* Right Arrow -- Move forward one character */
input_forward();
@@ -1428,53 +1410,33 @@ prepare_to_die:
setTermSettings(0, (void *) &initial_settings);
handlers_sets &= ~SET_RESET_TERM;
+#if MAX_HISTORY >= 1
/* Handle command history log */
+ /* cleanup may be saved current command line */
+ free(history[MAX_HISTORY]);
+ history[MAX_HISTORY] = 0;
if (len) { /* no put empty line */
-
- struct history *h = his_end;
- char *ss;
-
- ss = xstrdup(command); /* duplicate */
-
- if (h == 0) {
- /* No previous history -- this memory is never freed */
- h = his_front = xmalloc(sizeof(struct history));
- h->n = xmalloc(sizeof(struct history));
-
- h->p = NULL;
- h->s = ss;
- h->n->p = h;
- h->n->n = NULL;
- h->n->s = NULL;
- his_end = h->n;
- history_counter++;
- } else {
- /* Add a new history command -- this memory is never freed */
- h->n = xmalloc(sizeof(struct history));
-
- h->n->p = h;
- h->n->n = NULL;
- h->n->s = NULL;
- h->s = ss;
- his_end = h->n;
-
+ int i = n_history;
/* After max history, remove the oldest command */
- if (history_counter >= MAX_HISTORY) {
-
- struct history *p = his_front->n;
-
- p->p = NULL;
- free(his_front->s);
- free(his_front);
- his_front = p;
- } else {
- history_counter++;
- }
+ if (i >= MAX_HISTORY) {
+ free(history[0]);
+ for(i = 0; i < (MAX_HISTORY-1); i++)
+ history[i] = history[i+1];
}
+ history[i++] = xstrdup(command);
+ cur_history = i;
+ n_history = i;
#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
num_ok_lines++;
#endif
}
+#else /* MAX_HISTORY < 1 */
+#if defined(CONFIG_FEATURE_SH_FANCY_PROMPT)
+ if (len) { /* no put empty line */
+ num_ok_lines++;
+ }
+#endif
+#endif /* MAX_HISTORY >= 1 */
if(break_out>0) {
command[len++] = '\n'; /* set '\n' */
command[len] = 0;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-19 08:59:06 +0000