diff options
Diffstat (limited to 'common/cli_readline.c')
| -rw-r--r-- | common/cli_readline.c | 621 |
1 files changed, 621 insertions, 0 deletions
diff --git a/common/cli_readline.c b/common/cli_readline.c new file mode 100644 index 0000000..9a9fb35 --- /dev/null +++ b/common/cli_readline.c @@ -0,0 +1,621 @@ +/* + * (C) Copyright 2000 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * Add to readline cmdline-editing by + * (C) Copyright 2005 + * JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <bootretry.h> +#include <cli.h> +#include <watchdog.h> + +DECLARE_GLOBAL_DATA_PTR; + +static const char erase_seq[] = "\b \b"; /* erase sequence */ +static const char tab_seq[] = " "; /* used to expand TABs */ + +char console_buffer[CONFIG_SYS_CBSIZE + 1]; /* console I/O buffer */ + +static char *delete_char (char *buffer, char *p, int *colp, int *np, int plen) +{ + char *s; + + if (*np == 0) + return p; + + if (*(--p) == '\t') { /* will retype the whole line */ + while (*colp > plen) { + puts(erase_seq); + (*colp)--; + } + for (s = buffer; s < p; ++s) { + if (*s == '\t') { + puts(tab_seq + ((*colp) & 07)); + *colp += 8 - ((*colp) & 07); + } else { + ++(*colp); + putc(*s); + } + } + } else { + puts(erase_seq); + (*colp)--; + } + (*np)--; + + return p; +} + +#ifdef CONFIG_CMDLINE_EDITING + +/* + * cmdline-editing related codes from vivi. + * Author: Janghoon Lyu <nandy@mizi.com> + */ + +#define putnstr(str, n) printf("%.*s", (int)n, str) + +#define CTL_CH(c) ((c) - 'a' + 1) +#define CTL_BACKSPACE ('\b') +#define DEL ((char)255) +#define DEL7 ((char)127) +#define CREAD_HIST_CHAR ('!') + +#define getcmd_putch(ch) putc(ch) +#define getcmd_getch() getc() +#define getcmd_cbeep() getcmd_putch('\a') + +#define HIST_MAX 20 +#define HIST_SIZE CONFIG_SYS_CBSIZE + +static int hist_max; +static int hist_add_idx; +static int hist_cur = -1; +static unsigned hist_num; + +static char *hist_list[HIST_MAX]; +static char hist_lines[HIST_MAX][HIST_SIZE + 1]; /* Save room for NULL */ + +#define add_idx_minus_one() ((hist_add_idx == 0) ? hist_max : hist_add_idx-1) + +static void hist_init(void) +{ + int i; + + hist_max = 0; + hist_add_idx = 0; + hist_cur = -1; + hist_num = 0; + + for (i = 0; i < HIST_MAX; i++) { + hist_list[i] = hist_lines[i]; + hist_list[i][0] = '\0'; + } +} + +static void cread_add_to_hist(char *line) +{ + strcpy(hist_list[hist_add_idx], line); + + if (++hist_add_idx >= HIST_MAX) + hist_add_idx = 0; + + if (hist_add_idx > hist_max) + hist_max = hist_add_idx; + + hist_num++; +} + +static char *hist_prev(void) +{ + char *ret; + int old_cur; + + if (hist_cur < 0) + return NULL; + + old_cur = hist_cur; + if (--hist_cur < 0) + hist_cur = hist_max; + + if (hist_cur == hist_add_idx) { + hist_cur = old_cur; + ret = NULL; + } else { + ret = hist_list[hist_cur]; + } + + return ret; +} + +static char *hist_next(void) +{ + char *ret; + + if (hist_cur < 0) + return NULL; + + if (hist_cur == hist_add_idx) + return NULL; + + if (++hist_cur > hist_max) + hist_cur = 0; + + if (hist_cur == hist_add_idx) + ret = ""; + else + ret = hist_list[hist_cur]; + + return ret; +} + +#ifndef CONFIG_CMDLINE_EDITING +static void cread_print_hist_list(void) +{ + int i; + unsigned long n; + + n = hist_num - hist_max; + + i = hist_add_idx + 1; + while (1) { + if (i > hist_max) + i = 0; + if (i == hist_add_idx) + break; + printf("%s\n", hist_list[i]); + n++; + i++; + } +} +#endif /* CONFIG_CMDLINE_EDITING */ + +#define BEGINNING_OF_LINE() { \ + while (num) { \ + getcmd_putch(CTL_BACKSPACE); \ + num--; \ + } \ +} + +#define ERASE_TO_EOL() { \ + if (num < eol_num) { \ + printf("%*s", (int)(eol_num - num), ""); \ + do { \ + getcmd_putch(CTL_BACKSPACE); \ + } while (--eol_num > num); \ + } \ +} + +#define REFRESH_TO_EOL() { \ + if (num < eol_num) { \ + wlen = eol_num - num; \ + putnstr(buf + num, wlen); \ + num = eol_num; \ + } \ +} + +static void cread_add_char(char ichar, int insert, unsigned long *num, + unsigned long *eol_num, char *buf, unsigned long len) +{ + unsigned long wlen; + + /* room ??? */ + if (insert || *num == *eol_num) { + if (*eol_num > len - 1) { + getcmd_cbeep(); + return; + } + (*eol_num)++; + } + + if (insert) { + wlen = *eol_num - *num; + if (wlen > 1) + memmove(&buf[*num+1], &buf[*num], wlen-1); + + buf[*num] = ichar; + putnstr(buf + *num, wlen); + (*num)++; + while (--wlen) + getcmd_putch(CTL_BACKSPACE); + } else { + /* echo the character */ + wlen = 1; + buf[*num] = ichar; + putnstr(buf + *num, wlen); + (*num)++; + } +} + +static void cread_add_str(char *str, int strsize, int insert, + unsigned long *num, unsigned long *eol_num, + char *buf, unsigned long len) +{ + while (strsize--) { + cread_add_char(*str, insert, num, eol_num, buf, len); + str++; + } +} + +static int cread_line(const char *const prompt, char *buf, unsigned int *len, + int timeout) +{ + unsigned long num = 0; + unsigned long eol_num = 0; + unsigned long wlen; + char ichar; + int insert = 1; + int esc_len = 0; + char esc_save[8]; + int init_len = strlen(buf); + int first = 1; + + if (init_len) + cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len); + + while (1) { + if (bootretry_tstc_timeout()) + return -2; /* timed out */ + if (first && timeout) { + uint64_t etime = endtick(timeout); + + while (!tstc()) { /* while no incoming data */ + if (get_ticks() >= etime) + return -2; /* timed out */ + WATCHDOG_RESET(); + } + first = 0; + } + + ichar = getcmd_getch(); + + if ((ichar == '\n') || (ichar == '\r')) { + putc('\n'); + break; + } + + /* + * handle standard linux xterm esc sequences for arrow key, etc. + */ + if (esc_len != 0) { + if (esc_len == 1) { + if (ichar == '[') { + esc_save[esc_len] = ichar; + esc_len = 2; + } else { + cread_add_str(esc_save, esc_len, + insert, &num, &eol_num, + buf, *len); + esc_len = 0; + } + continue; + } + + switch (ichar) { + case 'D': /* <- key */ + ichar = CTL_CH('b'); + esc_len = 0; + break; + case 'C': /* -> key */ + ichar = CTL_CH('f'); + esc_len = 0; + break; /* pass off to ^F handler */ + case 'H': /* Home key */ + ichar = CTL_CH('a'); + esc_len = 0; + break; /* pass off to ^A handler */ + case 'A': /* up arrow */ + ichar = CTL_CH('p'); + esc_len = 0; + break; /* pass off to ^P handler */ + case 'B': /* down arrow */ + ichar = CTL_CH('n'); + esc_len = 0; + break; /* pass off to ^N handler */ + default: + esc_save[esc_len++] = ichar; + cread_add_str(esc_save, esc_len, insert, + &num, &eol_num, buf, *len); + esc_len = 0; + continue; + } + } + + switch (ichar) { + case 0x1b: + if (esc_len == 0) { + esc_save[esc_len] = ichar; + esc_len = 1; + } else { + puts("impossible condition #876\n"); + esc_len = 0; + } + break; + + case CTL_CH('a'): + BEGINNING_OF_LINE(); + break; + case CTL_CH('c'): /* ^C - break */ + *buf = '\0'; /* discard input */ + return -1; + case CTL_CH('f'): + if (num < eol_num) { + getcmd_putch(buf[num]); + num++; + } + break; + case CTL_CH('b'): + if (num) { + getcmd_putch(CTL_BACKSPACE); + num--; + } + break; + case CTL_CH('d'): + if (num < eol_num) { + wlen = eol_num - num - 1; + if (wlen) { + memmove(&buf[num], &buf[num+1], wlen); + putnstr(buf + num, wlen); + } + + getcmd_putch(' '); + do { + getcmd_putch(CTL_BACKSPACE); + } while (wlen--); + eol_num--; + } + break; + case CTL_CH('k'): + ERASE_TO_EOL(); + break; + case CTL_CH('e'): + REFRESH_TO_EOL(); + break; + case CTL_CH('o'): + insert = !insert; + break; + case CTL_CH('x'): + case CTL_CH('u'): + BEGINNING_OF_LINE(); + ERASE_TO_EOL(); + break; + case DEL: + case DEL7: + case 8: + if (num) { + wlen = eol_num - num; + num--; + memmove(&buf[num], &buf[num+1], wlen); + getcmd_putch(CTL_BACKSPACE); + putnstr(buf + num, wlen); + getcmd_putch(' '); + do { + getcmd_putch(CTL_BACKSPACE); + } while (wlen--); + eol_num--; + } + break; + case CTL_CH('p'): + case CTL_CH('n'): + { + char *hline; + + esc_len = 0; + + if (ichar == CTL_CH('p')) + hline = hist_prev(); + else + hline = hist_next(); + + if (!hline) { + getcmd_cbeep(); + continue; + } + + /* nuke the current line */ + /* first, go home */ + BEGINNING_OF_LINE(); + + /* erase to end of line */ + ERASE_TO_EOL(); + + /* copy new line into place and display */ + strcpy(buf, hline); + eol_num = strlen(buf); + REFRESH_TO_EOL(); + continue; + } +#ifdef CONFIG_AUTO_COMPLETE + case '\t': { + int num2, col; + + /* do not autocomplete when in the middle */ + if (num < eol_num) { + getcmd_cbeep(); + break; + } + + buf[num] = '\0'; + col = strlen(prompt) + eol_num; + num2 = num; + if (cmd_auto_complete(prompt, buf, &num2, &col)) { + col = num2 - num; + num += col; + eol_num += col; + } + break; + } +#endif + default: + cread_add_char(ichar, insert, &num, &eol_num, buf, + *len); + break; + } + } + *len = eol_num; + buf[eol_num] = '\0'; /* lose the newline */ + + if (buf[0] && buf[0] != CREAD_HIST_CHAR) + cread_add_to_hist(buf); + hist_cur = hist_add_idx; + + return 0; +} + +#endif /* CONFIG_CMDLINE_EDITING */ + +/****************************************************************************/ + +int cli_readline(const char *const prompt) +{ + /* + * If console_buffer isn't 0-length the user will be prompted to modify + * it instead of entering it from scratch as desired. + */ + console_buffer[0] = '\0'; + + return cli_readline_into_buffer(prompt, console_buffer, 0); +} + + +int cli_readline_into_buffer(const char *const prompt, char *buffer, + int timeout) +{ + char *p = buffer; +#ifdef CONFIG_CMDLINE_EDITING + unsigned int len = CONFIG_SYS_CBSIZE; + int rc; + static int initted; + + /* + * History uses a global array which is not + * writable until after relocation to RAM. + * Revert to non-history version if still + * running from flash. + */ + if (gd->flags & GD_FLG_RELOC) { + if (!initted) { + hist_init(); + initted = 1; + } + + if (prompt) + puts(prompt); + + rc = cread_line(prompt, p, &len, timeout); + return rc < 0 ? rc : len; + + } else { +#endif /* CONFIG_CMDLINE_EDITING */ + char *p_buf = p; + int n = 0; /* buffer index */ + int plen = 0; /* prompt length */ + int col; /* output column cnt */ + char c; + + /* print prompt */ + if (prompt) { + plen = strlen(prompt); + puts(prompt); + } + col = plen; + + for (;;) { + if (bootretry_tstc_timeout()) + return -2; /* timed out */ + WATCHDOG_RESET(); /* Trigger watchdog, if needed */ + +#ifdef CONFIG_SHOW_ACTIVITY + while (!tstc()) { + show_activity(0); + WATCHDOG_RESET(); + } +#endif + c = getc(); + + /* + * Special character handling + */ + switch (c) { + case '\r': /* Enter */ + case '\n': + *p = '\0'; + puts("\r\n"); + return p - p_buf; + + case '\0': /* nul */ + continue; + + case 0x03: /* ^C - break */ + p_buf[0] = '\0'; /* discard input */ + return -1; + + case 0x15: /* ^U - erase line */ + while (col > plen) { + puts(erase_seq); + --col; + } + p = p_buf; + n = 0; + continue; + + case 0x17: /* ^W - erase word */ + p = delete_char(p_buf, p, &col, &n, plen); + while ((n > 0) && (*p != ' ')) + p = delete_char(p_buf, p, &col, &n, plen); + continue; + + case 0x08: /* ^H - backspace */ + case 0x7F: /* DEL - backspace */ + p = delete_char(p_buf, p, &col, &n, plen); + continue; + + default: + /* + * Must be a normal character then + */ + if (n < CONFIG_SYS_CBSIZE-2) { + if (c == '\t') { /* expand TABs */ +#ifdef CONFIG_AUTO_COMPLETE + /* + * if auto completion triggered just + * continue + */ + *p = '\0'; + if (cmd_auto_complete(prompt, + console_buffer, + &n, &col)) { + p = p_buf + n; /* reset */ + continue; + } +#endif + puts(tab_seq + (col & 07)); + col += 8 - (col & 07); + } else { + char buf[2]; + + /* + * Echo input using puts() to force an + * LCD flush if we are using an LCD + */ + ++col; + buf[0] = c; + buf[1] = '\0'; + puts(buf); + } + *p++ = c; + ++n; + } else { /* Buffer full */ + putc('\a'); + } + } + } +#ifdef CONFIG_CMDLINE_EDITING + } +#endif +} |