separated readline from monitor code - added password input support - added output buffer
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1034 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/readline.c b/readline.c
new file mode 100644
index 0000000..cbe33db
--- /dev/null
+++ b/readline.c
@@ -0,0 +1,425 @@
+/*
+ * QEMU readline utility
+ *
+ * Copyright (c) 2003-2004 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+#include "vl.h"
+
+#define TERM_CMD_BUF_SIZE 4095
+#define TERM_MAX_CMDS 64
+#define NB_COMPLETIONS_MAX 256
+
+#define IS_NORM 0
+#define IS_ESC 1
+#define IS_CSI 2
+
+#define printf do_not_use_printf
+
+static char term_cmd_buf[TERM_CMD_BUF_SIZE + 1];
+static int term_cmd_buf_index;
+static int term_cmd_buf_size;
+
+static char term_last_cmd_buf[TERM_CMD_BUF_SIZE + 1];
+static int term_last_cmd_buf_index;
+static int term_last_cmd_buf_size;
+
+static int term_esc_state;
+static int term_esc_param;
+
+static char *term_history[TERM_MAX_CMDS];
+static int term_hist_entry = -1;
+
+static int nb_completions;
+int completion_index;
+static char *completions[NB_COMPLETIONS_MAX];
+
+static ReadLineFunc *term_readline_func;
+static int term_is_password;
+static char term_prompt[256];
+static void *term_readline_opaque;
+
+static void term_show_prompt2(void)
+{
+ term_printf("%s", term_prompt);
+ term_flush();
+ term_last_cmd_buf_index = 0;
+ term_last_cmd_buf_size = 0;
+ term_esc_state = IS_NORM;
+}
+
+static void term_show_prompt(void)
+{
+ term_show_prompt2();
+ term_cmd_buf_index = 0;
+ term_cmd_buf_size = 0;
+}
+
+/* update the displayed command line */
+static void term_update(void)
+{
+ int i, delta, len;
+
+ if (term_cmd_buf_size != term_last_cmd_buf_size ||
+ memcmp(term_cmd_buf, term_last_cmd_buf, term_cmd_buf_size) != 0) {
+ for(i = 0; i < term_last_cmd_buf_index; i++) {
+ term_printf("\033[D");
+ }
+ term_cmd_buf[term_cmd_buf_size] = '\0';
+ if (term_is_password) {
+ len = strlen(term_cmd_buf);
+ for(i = 0; i < len; i++)
+ term_printf("*");
+ } else {
+ term_printf("%s", term_cmd_buf);
+ }
+ term_printf("\033[K");
+ memcpy(term_last_cmd_buf, term_cmd_buf, term_cmd_buf_size);
+ term_last_cmd_buf_size = term_cmd_buf_size;
+ term_last_cmd_buf_index = term_cmd_buf_size;
+ }
+ if (term_cmd_buf_index != term_last_cmd_buf_index) {
+ delta = term_cmd_buf_index - term_last_cmd_buf_index;
+ if (delta > 0) {
+ for(i = 0;i < delta; i++) {
+ term_printf("\033[C");
+ }
+ } else {
+ delta = -delta;
+ for(i = 0;i < delta; i++) {
+ term_printf("\033[D");
+ }
+ }
+ term_last_cmd_buf_index = term_cmd_buf_index;
+ }
+ term_flush();
+}
+
+static void term_insert_char(int ch)
+{
+ if (term_cmd_buf_index < TERM_CMD_BUF_SIZE) {
+ memmove(term_cmd_buf + term_cmd_buf_index + 1,
+ term_cmd_buf + term_cmd_buf_index,
+ term_cmd_buf_size - term_cmd_buf_index);
+ term_cmd_buf[term_cmd_buf_index] = ch;
+ term_cmd_buf_size++;
+ term_cmd_buf_index++;
+ }
+}
+
+static void term_backward_char(void)
+{
+ if (term_cmd_buf_index > 0) {
+ term_cmd_buf_index--;
+ }
+}
+
+static void term_forward_char(void)
+{
+ if (term_cmd_buf_index < term_cmd_buf_size) {
+ term_cmd_buf_index++;
+ }
+}
+
+static void term_delete_char(void)
+{
+ if (term_cmd_buf_index < term_cmd_buf_size) {
+ memmove(term_cmd_buf + term_cmd_buf_index,
+ term_cmd_buf + term_cmd_buf_index + 1,
+ term_cmd_buf_size - term_cmd_buf_index - 1);
+ term_cmd_buf_size--;
+ }
+}
+
+static void term_backspace(void)
+{
+ if (term_cmd_buf_index > 0) {
+ term_backward_char();
+ term_delete_char();
+ }
+}
+
+static void term_bol(void)
+{
+ term_cmd_buf_index = 0;
+}
+
+static void term_eol(void)
+{
+ term_cmd_buf_index = term_cmd_buf_size;
+}
+
+static void term_up_char(void)
+{
+ int idx;
+
+ if (term_hist_entry == 0)
+ return;
+ if (term_hist_entry == -1) {
+ /* Find latest entry */
+ for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
+ if (term_history[idx] == NULL)
+ break;
+ }
+ term_hist_entry = idx;
+ }
+ term_hist_entry--;
+ if (term_hist_entry >= 0) {
+ pstrcpy(term_cmd_buf, sizeof(term_cmd_buf),
+ term_history[term_hist_entry]);
+ term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
+ }
+}
+
+static void term_down_char(void)
+{
+ if (term_hist_entry == TERM_MAX_CMDS - 1 || term_hist_entry == -1)
+ return;
+ if (term_history[++term_hist_entry] != NULL) {
+ pstrcpy(term_cmd_buf, sizeof(term_cmd_buf),
+ term_history[term_hist_entry]);
+ } else {
+ term_hist_entry = -1;
+ }
+ term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
+}
+
+static void term_hist_add(const char *cmdline)
+{
+ char *hist_entry, *new_entry;
+ int idx;
+
+ if (cmdline[0] == '\0')
+ return;
+ new_entry = NULL;
+ if (term_hist_entry != -1) {
+ /* We were editing an existing history entry: replace it */
+ hist_entry = term_history[term_hist_entry];
+ idx = term_hist_entry;
+ if (strcmp(hist_entry, cmdline) == 0) {
+ goto same_entry;
+ }
+ }
+ /* Search cmdline in history buffers */
+ for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
+ hist_entry = term_history[idx];
+ if (hist_entry == NULL)
+ break;
+ if (strcmp(hist_entry, cmdline) == 0) {
+ same_entry:
+ new_entry = hist_entry;
+ /* Put this entry at the end of history */
+ memmove(&term_history[idx], &term_history[idx + 1],
+ &term_history[TERM_MAX_CMDS] - &term_history[idx + 1]);
+ term_history[TERM_MAX_CMDS - 1] = NULL;
+ for (; idx < TERM_MAX_CMDS; idx++) {
+ if (term_history[idx] == NULL)
+ break;
+ }
+ break;
+ }
+ }
+ if (idx == TERM_MAX_CMDS) {
+ /* Need to get one free slot */
+ free(term_history[0]);
+ memcpy(term_history, &term_history[1],
+ &term_history[TERM_MAX_CMDS] - &term_history[1]);
+ term_history[TERM_MAX_CMDS - 1] = NULL;
+ idx = TERM_MAX_CMDS - 1;
+ }
+ if (new_entry == NULL)
+ new_entry = strdup(cmdline);
+ term_history[idx] = new_entry;
+ term_hist_entry = -1;
+}
+
+/* completion support */
+
+void add_completion(const char *str)
+{
+ if (nb_completions < NB_COMPLETIONS_MAX) {
+ completions[nb_completions++] = qemu_strdup(str);
+ }
+}
+
+static void term_completion(void)
+{
+ int len, i, j, max_width, nb_cols;
+ char *cmdline;
+
+ nb_completions = 0;
+
+ cmdline = qemu_malloc(term_cmd_buf_index + 1);
+ if (!cmdline)
+ return;
+ memcpy(cmdline, term_cmd_buf, term_cmd_buf_index);
+ cmdline[term_cmd_buf_index] = '\0';
+ readline_find_completion(cmdline);
+ qemu_free(cmdline);
+
+ /* no completion found */
+ if (nb_completions <= 0)
+ return;
+ if (nb_completions == 1) {
+ len = strlen(completions[0]);
+ for(i = completion_index; i < len; i++) {
+ term_insert_char(completions[0][i]);
+ }
+ /* extra space for next argument. XXX: make it more generic */
+ if (len > 0 && completions[0][len - 1] != '/')
+ term_insert_char(' ');
+ } else {
+ term_printf("\n");
+ max_width = 0;
+ for(i = 0; i < nb_completions; i++) {
+ len = strlen(completions[i]);
+ if (len > max_width)
+ max_width = len;
+ }
+ max_width += 2;
+ if (max_width < 10)
+ max_width = 10;
+ else if (max_width > 80)
+ max_width = 80;
+ nb_cols = 80 / max_width;
+ j = 0;
+ for(i = 0; i < nb_completions; i++) {
+ term_printf("%-*s", max_width, completions[i]);
+ if (++j == nb_cols || i == (nb_completions - 1)) {
+ term_printf("\n");
+ j = 0;
+ }
+ }
+ term_show_prompt2();
+ }
+}
+
+/* return true if command handled */
+void readline_handle_byte(int ch)
+{
+ switch(term_esc_state) {
+ case IS_NORM:
+ switch(ch) {
+ case 1:
+ term_bol();
+ break;
+ case 4:
+ term_delete_char();
+ break;
+ case 5:
+ term_eol();
+ break;
+ case 9:
+ term_completion();
+ break;
+ case 10:
+ case 13:
+ term_cmd_buf[term_cmd_buf_size] = '\0';
+ if (!term_is_password)
+ term_hist_add(term_cmd_buf);
+ term_printf("\n");
+ /* NOTE: readline_start can be called here */
+ term_readline_func(term_readline_opaque, term_cmd_buf);
+ break;
+ case 27:
+ term_esc_state = IS_ESC;
+ break;
+ case 127:
+ case 8:
+ term_backspace();
+ break;
+ case 155:
+ term_esc_state = IS_CSI;
+ break;
+ default:
+ if (ch >= 32) {
+ term_insert_char(ch);
+ }
+ break;
+ }
+ break;
+ case IS_ESC:
+ if (ch == '[') {
+ term_esc_state = IS_CSI;
+ term_esc_param = 0;
+ } else {
+ term_esc_state = IS_NORM;
+ }
+ break;
+ case IS_CSI:
+ switch(ch) {
+ case 'A':
+ case 'F':
+ term_up_char();
+ break;
+ case 'B':
+ case 'E':
+ term_down_char();
+ break;
+ case 'D':
+ term_backward_char();
+ break;
+ case 'C':
+ term_forward_char();
+ break;
+ case '0' ... '9':
+ term_esc_param = term_esc_param * 10 + (ch - '0');
+ goto the_end;
+ case '~':
+ switch(term_esc_param) {
+ case 1:
+ term_bol();
+ break;
+ case 3:
+ term_delete_char();
+ break;
+ case 4:
+ term_eol();
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+ term_esc_state = IS_NORM;
+ the_end:
+ break;
+ }
+ term_update();
+}
+
+void readline_start(const char *prompt, int is_password,
+ ReadLineFunc *readline_func, void *opaque)
+{
+ pstrcpy(term_prompt, sizeof(term_prompt), prompt);
+ term_readline_func = readline_func;
+ term_readline_opaque = opaque;
+ term_is_password = is_password;
+ term_show_prompt();
+}
+
+const char *readline_get_history(unsigned int index)
+{
+ if (index >= TERM_MAX_CMDS)
+ return NULL;
+ return term_history[index];
+}
+
+
