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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * (C) Copyright 2000
4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5  *
6  * Add to readline cmdline-editing by
7  * (C) Copyright 2005
8  * JinHua Luo, GuangDong Linux Center, <luo.jinhua@gd-linux.com>
9  */
10
11 #include <common.h>
12 #include <bootretry.h>
13 #include <cli.h>
14 #include <watchdog.h>
15
16 DECLARE_GLOBAL_DATA_PTR;
17
18 static const char erase_seq[] = "\b \b";        /* erase sequence */
19 static const char   tab_seq[] = "        ";     /* used to expand TABs */
20
21 char console_buffer[CONFIG_SYS_CBSIZE + 1];     /* console I/O buffer   */
22
23 static char *delete_char (char *buffer, char *p, int *colp, int *np, int plen)
24 {
25         char *s;
26
27         if (*np == 0)
28                 return p;
29
30         if (*(--p) == '\t') {           /* will retype the whole line */
31                 while (*colp > plen) {
32                         puts(erase_seq);
33                         (*colp)--;
34                 }
35                 for (s = buffer; s < p; ++s) {
36                         if (*s == '\t') {
37                                 puts(tab_seq + ((*colp) & 07));
38                                 *colp += 8 - ((*colp) & 07);
39                         } else {
40                                 ++(*colp);
41                                 putc(*s);
42                         }
43                 }
44         } else {
45                 puts(erase_seq);
46                 (*colp)--;
47         }
48         (*np)--;
49
50         return p;
51 }
52
53 #ifdef CONFIG_CMDLINE_EDITING
54
55 /*
56  * cmdline-editing related codes from vivi.
57  * Author: Janghoon Lyu <nandy@mizi.com>
58  */
59
60 #define putnstr(str, n) printf("%.*s", (int)n, str)
61
62 #define CTL_CH(c)               ((c) - 'a' + 1)
63 #define CTL_BACKSPACE           ('\b')
64 #define DEL                     ((char)255)
65 #define DEL7                    ((char)127)
66 #define CREAD_HIST_CHAR         ('!')
67
68 #define getcmd_putch(ch)        putc(ch)
69 #define getcmd_getch()          getc()
70 #define getcmd_cbeep()          getcmd_putch('\a')
71
72 #define HIST_MAX                20
73 #define HIST_SIZE               CONFIG_SYS_CBSIZE
74
75 static int hist_max;
76 static int hist_add_idx;
77 static int hist_cur = -1;
78 static unsigned hist_num;
79
80 static char *hist_list[HIST_MAX];
81 static char hist_lines[HIST_MAX][HIST_SIZE + 1];        /* Save room for NULL */
82
83 #define add_idx_minus_one() ((hist_add_idx == 0) ? hist_max : hist_add_idx-1)
84
85 static void hist_init(void)
86 {
87         int i;
88
89         hist_max = 0;
90         hist_add_idx = 0;
91         hist_cur = -1;
92         hist_num = 0;
93
94         for (i = 0; i < HIST_MAX; i++) {
95                 hist_list[i] = hist_lines[i];
96                 hist_list[i][0] = '\0';
97         }
98 }
99
100 static void cread_add_to_hist(char *line)
101 {
102         strcpy(hist_list[hist_add_idx], line);
103
104         if (++hist_add_idx >= HIST_MAX)
105                 hist_add_idx = 0;
106
107         if (hist_add_idx > hist_max)
108                 hist_max = hist_add_idx;
109
110         hist_num++;
111 }
112
113 static char *hist_prev(void)
114 {
115         char *ret;
116         int old_cur;
117
118         if (hist_cur < 0)
119                 return NULL;
120
121         old_cur = hist_cur;
122         if (--hist_cur < 0)
123                 hist_cur = hist_max;
124
125         if (hist_cur == hist_add_idx) {
126                 hist_cur = old_cur;
127                 ret = NULL;
128         } else {
129                 ret = hist_list[hist_cur];
130         }
131
132         return ret;
133 }
134
135 static char *hist_next(void)
136 {
137         char *ret;
138
139         if (hist_cur < 0)
140                 return NULL;
141
142         if (hist_cur == hist_add_idx)
143                 return NULL;
144
145         if (++hist_cur > hist_max)
146                 hist_cur = 0;
147
148         if (hist_cur == hist_add_idx)
149                 ret = "";
150         else
151                 ret = hist_list[hist_cur];
152
153         return ret;
154 }
155
156 #ifndef CONFIG_CMDLINE_EDITING
157 static void cread_print_hist_list(void)
158 {
159         int i;
160         unsigned long n;
161
162         n = hist_num - hist_max;
163
164         i = hist_add_idx + 1;
165         while (1) {
166                 if (i > hist_max)
167                         i = 0;
168                 if (i == hist_add_idx)
169                         break;
170                 printf("%s\n", hist_list[i]);
171                 n++;
172                 i++;
173         }
174 }
175 #endif /* CONFIG_CMDLINE_EDITING */
176
177 #define BEGINNING_OF_LINE() {                   \
178         while (num) {                           \
179                 getcmd_putch(CTL_BACKSPACE);    \
180                 num--;                          \
181         }                                       \
182 }
183
184 #define ERASE_TO_EOL() {                                \
185         if (num < eol_num) {                            \
186                 printf("%*s", (int)(eol_num - num), ""); \
187                 do {                                    \
188                         getcmd_putch(CTL_BACKSPACE);    \
189                 } while (--eol_num > num);              \
190         }                                               \
191 }
192
193 #define REFRESH_TO_EOL() {                      \
194         if (num < eol_num) {                    \
195                 wlen = eol_num - num;           \
196                 putnstr(buf + num, wlen);       \
197                 num = eol_num;                  \
198         }                                       \
199 }
200
201 static void cread_add_char(char ichar, int insert, unsigned long *num,
202                unsigned long *eol_num, char *buf, unsigned long len)
203 {
204         unsigned long wlen;
205
206         /* room ??? */
207         if (insert || *num == *eol_num) {
208                 if (*eol_num > len - 1) {
209                         getcmd_cbeep();
210                         return;
211                 }
212                 (*eol_num)++;
213         }
214
215         if (insert) {
216                 wlen = *eol_num - *num;
217                 if (wlen > 1)
218                         memmove(&buf[*num+1], &buf[*num], wlen-1);
219
220                 buf[*num] = ichar;
221                 putnstr(buf + *num, wlen);
222                 (*num)++;
223                 while (--wlen)
224                         getcmd_putch(CTL_BACKSPACE);
225         } else {
226                 /* echo the character */
227                 wlen = 1;
228                 buf[*num] = ichar;
229                 putnstr(buf + *num, wlen);
230                 (*num)++;
231         }
232 }
233
234 static void cread_add_str(char *str, int strsize, int insert,
235                           unsigned long *num, unsigned long *eol_num,
236                           char *buf, unsigned long len)
237 {
238         while (strsize--) {
239                 cread_add_char(*str, insert, num, eol_num, buf, len);
240                 str++;
241         }
242 }
243
244 static int cread_line(const char *const prompt, char *buf, unsigned int *len,
245                 int timeout)
246 {
247         unsigned long num = 0;
248         unsigned long eol_num = 0;
249         unsigned long wlen;
250         char ichar;
251         int insert = 1;
252         int esc_len = 0;
253         char esc_save[8];
254         int init_len = strlen(buf);
255         int first = 1;
256
257         if (init_len)
258                 cread_add_str(buf, init_len, 1, &num, &eol_num, buf, *len);
259
260         while (1) {
261                 if (bootretry_tstc_timeout())
262                         return -2;      /* timed out */
263                 if (first && timeout) {
264                         uint64_t etime = endtick(timeout);
265
266                         while (!tstc()) {       /* while no incoming data */
267                                 if (get_ticks() >= etime)
268                                         return -2;      /* timed out */
269                                 WATCHDOG_RESET();
270                         }
271                         first = 0;
272                 }
273
274                 ichar = getcmd_getch();
275
276                 if ((ichar == '\n') || (ichar == '\r')) {
277                         putc('\n');
278                         break;
279                 }
280
281                 /*
282                  * handle standard linux xterm esc sequences for arrow key, etc.
283                  */
284                 if (esc_len != 0) {
285                         enum { ESC_REJECT, ESC_SAVE, ESC_CONVERTED } act = ESC_REJECT;
286
287                         if (esc_len == 1) {
288                                 if (ichar == '[' || ichar == 'O')
289                                         act = ESC_SAVE;
290                         } else if (esc_len == 2) {
291                                 switch (ichar) {
292                                 case 'D':       /* <- key */
293                                         ichar = CTL_CH('b');
294                                         act = ESC_CONVERTED;
295                                         break;  /* pass off to ^B handler */
296                                 case 'C':       /* -> key */
297                                         ichar = CTL_CH('f');
298                                         act = ESC_CONVERTED;
299                                         break;  /* pass off to ^F handler */
300                                 case 'H':       /* Home key */
301                                         ichar = CTL_CH('a');
302                                         act = ESC_CONVERTED;
303                                         break;  /* pass off to ^A handler */
304                                 case 'F':       /* End key */
305                                         ichar = CTL_CH('e');
306                                         act = ESC_CONVERTED;
307                                         break;  /* pass off to ^E handler */
308                                 case 'A':       /* up arrow */
309                                         ichar = CTL_CH('p');
310                                         act = ESC_CONVERTED;
311                                         break;  /* pass off to ^P handler */
312                                 case 'B':       /* down arrow */
313                                         ichar = CTL_CH('n');
314                                         act = ESC_CONVERTED;
315                                         break;  /* pass off to ^N handler */
316                                 case '1':
317                                 case '3':
318                                 case '4':
319                                 case '7':
320                                 case '8':
321                                         if (esc_save[1] == '[') {
322                                                 /* see if next character is ~ */
323                                                 act = ESC_SAVE;
324                                         }
325                                         break;
326                                 }
327                         } else if (esc_len == 3) {
328                                 if (ichar == '~') {
329                                         switch (esc_save[2]) {
330                                         case '3':       /* Delete key */
331                                                 ichar = CTL_CH('d');
332                                                 act = ESC_CONVERTED;
333                                                 break;  /* pass to ^D handler */
334                                         case '1':       /* Home key */
335                                         case '7':
336                                                 ichar = CTL_CH('a');
337                                                 act = ESC_CONVERTED;
338                                                 break;  /* pass to ^A handler */
339                                         case '4':       /* End key */
340                                         case '8':
341                                                 ichar = CTL_CH('e');
342                                                 act = ESC_CONVERTED;
343                                                 break;  /* pass to ^E handler */
344                                         }
345                                 }
346                         }
347
348                         switch (act) {
349                         case ESC_SAVE:
350                                 esc_save[esc_len++] = ichar;
351                                 continue;
352                         case ESC_REJECT:
353                                 esc_save[esc_len++] = ichar;
354                                 cread_add_str(esc_save, esc_len, insert,
355                                               &num, &eol_num, buf, *len);
356                                 esc_len = 0;
357                                 continue;
358                         case ESC_CONVERTED:
359                                 esc_len = 0;
360                                 break;
361                         }
362                 }
363
364                 switch (ichar) {
365                 case 0x1b:
366                         if (esc_len == 0) {
367                                 esc_save[esc_len] = ichar;
368                                 esc_len = 1;
369                         } else {
370                                 puts("impossible condition #876\n");
371                                 esc_len = 0;
372                         }
373                         break;
374
375                 case CTL_CH('a'):
376                         BEGINNING_OF_LINE();
377                         break;
378                 case CTL_CH('c'):       /* ^C - break */
379                         *buf = '\0';    /* discard input */
380                         return -1;
381                 case CTL_CH('f'):
382                         if (num < eol_num) {
383                                 getcmd_putch(buf[num]);
384                                 num++;
385                         }
386                         break;
387                 case CTL_CH('b'):
388                         if (num) {
389                                 getcmd_putch(CTL_BACKSPACE);
390                                 num--;
391                         }
392                         break;
393                 case CTL_CH('d'):
394                         if (num < eol_num) {
395                                 wlen = eol_num - num - 1;
396                                 if (wlen) {
397                                         memmove(&buf[num], &buf[num+1], wlen);
398                                         putnstr(buf + num, wlen);
399                                 }
400
401                                 getcmd_putch(' ');
402                                 do {
403                                         getcmd_putch(CTL_BACKSPACE);
404                                 } while (wlen--);
405                                 eol_num--;
406                         }
407                         break;
408                 case CTL_CH('k'):
409                         ERASE_TO_EOL();
410                         break;
411                 case CTL_CH('e'):
412                         REFRESH_TO_EOL();
413                         break;
414                 case CTL_CH('o'):
415                         insert = !insert;
416                         break;
417                 case CTL_CH('x'):
418                 case CTL_CH('u'):
419                         BEGINNING_OF_LINE();
420                         ERASE_TO_EOL();
421                         break;
422                 case DEL:
423                 case DEL7:
424                 case 8:
425                         if (num) {
426                                 wlen = eol_num - num;
427                                 num--;
428                                 memmove(&buf[num], &buf[num+1], wlen);
429                                 getcmd_putch(CTL_BACKSPACE);
430                                 putnstr(buf + num, wlen);
431                                 getcmd_putch(' ');
432                                 do {
433                                         getcmd_putch(CTL_BACKSPACE);
434                                 } while (wlen--);
435                                 eol_num--;
436                         }
437                         break;
438                 case CTL_CH('p'):
439                 case CTL_CH('n'):
440                 {
441                         char *hline;
442
443                         esc_len = 0;
444
445                         if (ichar == CTL_CH('p'))
446                                 hline = hist_prev();
447                         else
448                                 hline = hist_next();
449
450                         if (!hline) {
451                                 getcmd_cbeep();
452                                 continue;
453                         }
454
455                         /* nuke the current line */
456                         /* first, go home */
457                         BEGINNING_OF_LINE();
458
459                         /* erase to end of line */
460                         ERASE_TO_EOL();
461
462                         /* copy new line into place and display */
463                         strcpy(buf, hline);
464                         eol_num = strlen(buf);
465                         REFRESH_TO_EOL();
466                         continue;
467                 }
468 #ifdef CONFIG_AUTO_COMPLETE
469                 case '\t': {
470                         int num2, col;
471
472                         /* do not autocomplete when in the middle */
473                         if (num < eol_num) {
474                                 getcmd_cbeep();
475                                 break;
476                         }
477
478                         buf[num] = '\0';
479                         col = strlen(prompt) + eol_num;
480                         num2 = num;
481                         if (cmd_auto_complete(prompt, buf, &num2, &col)) {
482                                 col = num2 - num;
483                                 num += col;
484                                 eol_num += col;
485                         }
486                         break;
487                 }
488 #endif
489                 default:
490                         cread_add_char(ichar, insert, &num, &eol_num, buf,
491                                        *len);
492                         break;
493                 }
494         }
495         *len = eol_num;
496         buf[eol_num] = '\0';    /* lose the newline */
497
498         if (buf[0] && buf[0] != CREAD_HIST_CHAR)
499                 cread_add_to_hist(buf);
500         hist_cur = hist_add_idx;
501
502         return 0;
503 }
504
505 #endif /* CONFIG_CMDLINE_EDITING */
506
507 /****************************************************************************/
508
509 int cli_readline(const char *const prompt)
510 {
511         /*
512          * If console_buffer isn't 0-length the user will be prompted to modify
513          * it instead of entering it from scratch as desired.
514          */
515         console_buffer[0] = '\0';
516
517         return cli_readline_into_buffer(prompt, console_buffer, 0);
518 }
519
520
521 int cli_readline_into_buffer(const char *const prompt, char *buffer,
522                              int timeout)
523 {
524         char *p = buffer;
525 #ifdef CONFIG_CMDLINE_EDITING
526         unsigned int len = CONFIG_SYS_CBSIZE;
527         int rc;
528         static int initted;
529
530         /*
531          * History uses a global array which is not
532          * writable until after relocation to RAM.
533          * Revert to non-history version if still
534          * running from flash.
535          */
536         if (gd->flags & GD_FLG_RELOC) {
537                 if (!initted) {
538                         hist_init();
539                         initted = 1;
540                 }
541
542                 if (prompt)
543                         puts(prompt);
544
545                 rc = cread_line(prompt, p, &len, timeout);
546                 return rc < 0 ? rc : len;
547
548         } else {
549 #endif  /* CONFIG_CMDLINE_EDITING */
550         char *p_buf = p;
551         int     n = 0;                          /* buffer index         */
552         int     plen = 0;                       /* prompt length        */
553         int     col;                            /* output column cnt    */
554         char    c;
555
556         /* print prompt */
557         if (prompt) {
558                 plen = strlen(prompt);
559                 puts(prompt);
560         }
561         col = plen;
562
563         for (;;) {
564                 if (bootretry_tstc_timeout())
565                         return -2;      /* timed out */
566                 WATCHDOG_RESET();       /* Trigger watchdog, if needed */
567
568 #ifdef CONFIG_SHOW_ACTIVITY
569                 while (!tstc()) {
570                         show_activity(0);
571                         WATCHDOG_RESET();
572                 }
573 #endif
574                 c = getc();
575
576                 /*
577                  * Special character handling
578                  */
579                 switch (c) {
580                 case '\r':                      /* Enter                */
581                 case '\n':
582                         *p = '\0';
583                         puts("\r\n");
584                         return p - p_buf;
585
586                 case '\0':                      /* nul                  */
587                         continue;
588
589                 case 0x03:                      /* ^C - break           */
590                         p_buf[0] = '\0';        /* discard input */
591                         return -1;
592
593                 case 0x15:                      /* ^U - erase line      */
594                         while (col > plen) {
595                                 puts(erase_seq);
596                                 --col;
597                         }
598                         p = p_buf;
599                         n = 0;
600                         continue;
601
602                 case 0x17:                      /* ^W - erase word      */
603                         p = delete_char(p_buf, p, &col, &n, plen);
604                         while ((n > 0) && (*p != ' '))
605                                 p = delete_char(p_buf, p, &col, &n, plen);
606                         continue;
607
608                 case 0x08:                      /* ^H  - backspace      */
609                 case 0x7F:                      /* DEL - backspace      */
610                         p = delete_char(p_buf, p, &col, &n, plen);
611                         continue;
612
613                 default:
614                         /*
615                          * Must be a normal character then
616                          */
617                         if (n < CONFIG_SYS_CBSIZE-2) {
618                                 if (c == '\t') {        /* expand TABs */
619 #ifdef CONFIG_AUTO_COMPLETE
620                                         /*
621                                          * if auto completion triggered just
622                                          * continue
623                                          */
624                                         *p = '\0';
625                                         if (cmd_auto_complete(prompt,
626                                                               console_buffer,
627                                                               &n, &col)) {
628                                                 p = p_buf + n;  /* reset */
629                                                 continue;
630                                         }
631 #endif
632                                         puts(tab_seq + (col & 07));
633                                         col += 8 - (col & 07);
634                                 } else {
635                                         char __maybe_unused buf[2];
636
637                                         /*
638                                          * Echo input using puts() to force an
639                                          * LCD flush if we are using an LCD
640                                          */
641                                         ++col;
642                                         buf[0] = c;
643                                         buf[1] = '\0';
644                                         puts(buf);
645                                 }
646                                 *p++ = c;
647                                 ++n;
648                         } else {                        /* Buffer full */
649                                 putc('\a');
650                         }
651                 }
652         }
653 #ifdef CONFIG_CMDLINE_EDITING
654         }
655 #endif
656 }