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