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1#include "common.h"
2#include <string.h>
3#include <stdlib.h>
4
5#include <avr/eeprom.h>
6
7#include "config.h"
8#include "debug.h"
9#include "xmalloc.h"
10#include "crc.h"
11#include "command.h"
12
13#include "env.h"
14
15
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16#define ENV_SIZE (CONFIG_ENV_SIZE - sizeof(uint16_t) -1)
17#define ACTIVE_FLAG 1
18#define OBSOLETE_FLAG 0
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19#define ENV_GET_VAL (1<<0)
20
21
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22/*
23 * Default Environment
24 */
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25
26#define DELIM "\0"
27
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28const FLASH char default_env[] = {
29 "bootdelay=" "3" DELIM
30 "bootcmd=" "reset; loadf; go $(startaddr)" DELIM
31 "baudrate=" "115200" DELIM
32 "startaddr=" "0" DELIM
33 DELIM
34};
35
1da3acc4 36/* EEPROM storage */
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37typedef struct environment_s {
38 uint16_t crc; /* CRC16 over data bytes */
323398b1 39 uint8_t flags; /* active/obsolete flags */
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40 char data[ENV_SIZE]; /* Environment data */
41} env_t;
42
43
1da3acc4 44/* */
d684c216 45typedef struct env_item_s {
72f58822
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46#define EF_N_EEP (1<<7) /* Variable name is in EEPROM */
47#define EF_V_EEP (1<<6) /* Variable value is in EEPROM */
48#define EF_DIRTY (1<<0) /* Variable is new or value changed */
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49 uint8_t flags;
50 union {
51 uint16_t eep;
52 char *ram;
53 } name;
54 union {
55 uint16_t eep;
56 char *ram;
57 } val;
58} env_item_t;
59
1da3acc4 60
323398b1 61static uint8_t env_valid;
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62static env_item_t env_list[CONFIG_ENVVAR_MAX];
63static int entrycount;
64
65
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66static
67char env_get_char(uint16_t index)
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68{
69 unsigned int off = CONFIG_ENV_OFFSET;
70
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71 if (env_valid == 2)
72 off = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
73
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74 return (char) eeprom_read_byte((const uint8_t *)off + index +
75 offsetof(env_t, data));
76}
77
78
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79static
80uint16_t varname_get(char *buf, env_item_t *ep)
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81{
82 int i = 0;
83 char c;
84
85 if (ep->flags & EF_N_EEP) {
86
87 while ((c = env_get_char(ep->name.eep + i)) != '=' &&
88 c != '\0' && i < CONFIG_SYS_ENV_NAMELEN) {
89
90 buf[i] = c;
91 i++;
92 }
93 if (i > 0 && c != '=') {
94 debug("** ee_name: '%s' not '=' terminated!\n", buf);
95 }
96 } else {
97 strncpy(buf, ep->name.ram, CONFIG_SYS_ENV_NAMELEN);
98 i = strnlen(buf, CONFIG_SYS_ENV_NAMELEN);
99 }
100 buf[i] = '\0';
101 return i;
102}
103
104
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105static
106uint16_t varval_getlen(uint16_t index)
107{
108 int i = 0;
109 char c;
110
111 while ((c = env_get_char (index + i)) != '\0') {
112 i++;
113 };
114
115 return i;
116}
117
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118static
119uint16_t varval_get(char *buf, uint16_t index, int len)
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120{
121 int i = 0;
122 char c;
123
124 while ((c = env_get_char (index + i)) != '\0' && i < len) {
125 buf[i] = c;
126 i++;
127 };
128
129 buf[i] = '\0';
130
131 /* TODO: len check */
132
133 return i;
134}
135
136static
137int comp_env_key_item(const void *key, const void *item)
138{
139 char buf[CONFIG_SYS_ENV_NAMELEN+1];
140 env_item_t *ep = (env_item_t *) item;
141
1da3acc4 142 varname_get(buf, ep);
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143
144 return strcmp((char *) key, buf);
145}
146
147static
148int comp_env_items(const void *m1, const void *m2)
149{
150 char b1[CONFIG_SYS_ENV_NAMELEN+1];
151 char b2[CONFIG_SYS_ENV_NAMELEN+1];
152
153 env_item_t *ep1 = (env_item_t *) m1;
154 env_item_t *ep2 = (env_item_t *) m2;
155
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156 varname_get(b1, ep1);
157 varname_get(b2, ep2);
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158
159 return strcmp(b1, b2);
160}
161
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162
163static
164int envlist_import(void)
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165{
166 char name[CONFIG_SYS_ENV_NAMELEN+1];
167 uint16_t idx = 0;
168 int nlen;
1da3acc4 169 env_item_t e;
d684c216 170
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171 e.flags = EF_N_EEP | EF_V_EEP;
172 e.name.eep = idx;
173 while ((nlen = varname_get(name, &e)) != 0 && idx < ENV_SIZE) {
d684c216 174
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175 if (entrycount <= CONFIG_ENVVAR_MAX) {
176 e.val.eep = idx + nlen + 1;
d684c216 177
1da3acc4 178 env_list[entrycount++] = e;
d684c216 179
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180 idx += nlen + 1;
181 while (env_get_char(idx++) != 0 && idx < ENV_SIZE)
182 ;
183 e.name.eep = idx;
184 } else {
185 debug("** Too many environment variables!\n");
186 break;
187 }
d684c216 188 }
1da3acc4 189 qsort(env_list, entrycount, sizeof(env_item_t), comp_env_items);
d684c216 190
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191 return 0;
192}
d684c216 193
d684c216 194
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195static
196int set_default_env(void)
d684c216 197{
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198 char buf[56];
199 uint16_t eep = CONFIG_ENV_OFFSET + offsetof(env_t, data);
200 unsigned int len = ENV_SIZE;
201 unsigned int i, src = 0;
202 char c = 0xff, c0 = c;
203
204 if (env_valid == 1) {
205 eep = CONFIG_ENV_OFFSET + offsetof(env_t, data) + CONFIG_ENV_SIZE;
d684c216 206 }
d684c216 207
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208 while (len) {
209 memcpy_P(buf, default_env+src, sizeof(buf));
210 for (i=0; i < (len < sizeof(buf) ? len : sizeof(buf)) &&
211 !(c == 0 && c0 == 0);
212 i++) {
213 c0 = c; c = buf[i];
d684c216 214 }
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215 eeprom_update_block(buf, (char *) eep, i);
216 if (c == 0 && c0 == 0)
217 len = 0;
218 if (len > sizeof(buf))
219 len -= sizeof(buf);
220 src += sizeof(buf);
221 eep += sizeof(buf);
d684c216 222 }
d684c216 223
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224 return 0;
225}
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226
227
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228static
229uint16_t env_crc(uint16_t data_offset)
323398b1 230{
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231 uint16_t crc;
232 uint16_t i;
233 char c, c0;
323398b1 234
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235 crc = 0xffff;
236 c = 0xff;
237 for (i = 0; !(c == 0 && c0 == 0) && i < ENV_SIZE; i++)
238 {
239 c0 = c;
240 c = eeprom_read_byte((const uint8_t *) data_offset + i);
241 crc = crc16(crc, c);
323398b1 242 }
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243 return crc ;
244}
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245
246
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247/**
248 * return valid env
323398b1 249 */
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250static
251int env_check_valid(void)
252{
253 const uint16_t offset[2] = {CONFIG_ENV_OFFSET,
254 CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE};
255 uint_fast8_t flags[2], crc_ok[2];
256 int rc;
257
258 /* read FLAGS */
259 flags[0] = eeprom_read_byte ((uint8_t *) offset[0] +
260 offsetof(env_t, flags));
261 flags[1] = eeprom_read_byte ((uint8_t *) offset[1] +
262 offsetof(env_t, flags));
263
264 /* check CRC */
265 crc_ok[0] = (
266 eeprom_read_word((uint16_t *) offset[0] +
267 offsetof(env_t, crc))
268 == env_crc(offset[0] + offsetof(env_t, data))
269 );
270 crc_ok[1] = (
271 eeprom_read_word((uint16_t *) offset[1] +
272 offsetof(env_t, crc))
273 == env_crc(offset[1] + offsetof(env_t, data))
274 );
323398b1 275
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276 if (!crc_ok[0] && !crc_ok[1]) {
277 rc = 0;
323398b1 278
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279 } else if (crc_ok[0] && !crc_ok[1]) {
280 rc = 1;
281 } else if (!crc_ok[0] && crc_ok[1]) {
282 rc = 2;
283 } else {
284 /* both ok - check serial */
285#if 1
286 if (flags[1] == ACTIVE_FLAG && flags[0] != ACTIVE_FLAG)
287 rc = 2;
288 else if (flags[1] == OBSOLETE_FLAG && flags[0] == 0xFF)
289 rc = 2;
290 else
291 rc = 1;
292#else
293 if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
294 rc = 1;
295 else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
296 rc = 2;
297 else if (flags[0] == 0xFF && flags[1] == 0)
298 rc = 2;
299 else if (flags[1] == 0xFF && flags[0] == 0)
300 rc = 1;
301 else /* flags are equal - almost impossible */
302 rc = 1;
303#endif
323398b1 304 }
323398b1 305
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306 return rc;
307}
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308
309
1da3acc4 310int env_init(void)
323398b1 311{
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312 env_valid = env_check_valid();
313 if (env_valid == 0) {
314 printf_P(PSTR("*** Warning - bad CRC, "
315 "using default environment\n\n"));
316 set_default_env();
323398b1 317 }
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318 entrycount = 0;
319 envlist_import();
320 return 0;
321}
323398b1 322
323398b1 323
d04c2fed 324
fc30b18e 325env_item_t *envlist_search(const MEMX char *name)
d684c216 326{
d04c2fed
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327 char *p = (char *) name;
328
329#ifdef __MEMX
330 char buf[CONFIG_SYS_ENV_NAMELEN+1];
331
332 if (__builtin_avr_flash_segment(name) != -1) {
333 p = buf;
334 while ((*p++ = *name++) != '\0')
335 ;
336 p = buf;
337 }
338#endif /* __MEMX */
339
340 return bsearch(p, env_list, entrycount,
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341 sizeof(env_item_t), comp_env_key_item);
342}
343
d684c216 344
1da3acc4 345static
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346env_item_t *envlist_enter(env_item_t *e)
347{
348 char *key = e->name.ram;
349 const size_t size = sizeof(env_item_t);
350 env_item_t *ep;
351
352 ep = bsearch(key, env_list, entrycount,
353 size, comp_env_key_item);
354
355 if (ep == NULL) {
356 if (entrycount < CONFIG_ENVVAR_MAX) {
357
358 env_list[entrycount++] = *e;
359 qsort(env_list, entrycount, size, comp_env_items);
360 ep = bsearch(key, env_list, entrycount,
361 size, comp_env_key_item);
362 }
363 } else {
364 if ((ep->flags & EF_V_EEP) == 0) {
365 free(ep->val.ram);
366 }
367 ep->val.ram = e->val.ram;
368 }
369
370 if (ep != NULL) {
371 ep->flags |= EF_DIRTY;
372 ep->flags &= ~EF_V_EEP;
373
374 if ((ep->flags & EF_N_EEP) == 0) {
375 int nlen = strnlen(key, CONFIG_SYS_ENV_NAMELEN);
376 char *name = xmalloc(nlen + 1);
377 if (name == NULL) {
378 printf_P(PSTR("## Can't malloc %d bytes\n"),
379 nlen + 1);
380 return NULL;
381 }
382 strcpy(name, key);
383 name[nlen] = '\0';
384 ep->name.ram = name;
385 }
386 }
387
388 return ep;
389}
390
391
1da3acc4 392static
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393int env_item_delete(env_item_t *ep)
394{
395 if (entrycount == 0)
396 return -1;
397 if ((ep->flags & EF_V_EEP) == 0)
398 free(ep->val.ram);
399 if ((ep->flags & EF_N_EEP) == 0)
400 free(ep->name.ram);
401
402 entrycount--;
403 size_t size = sizeof(env_item_t);
404 memmove(ep, ep + 1, (env_list - ep)*size + entrycount*size);
405
406 return 0;
407}
d684c216 408
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409static
410int envlist_delete(const char *name)
d684c216 411{
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412 env_item_t *ep = bsearch(name, env_list, entrycount,
413 sizeof(env_item_t), comp_env_key_item);
d684c216 414
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415 if (ep != NULL)
416 return env_item_delete(ep);
d684c216 417
323398b1 418 return 1;
d684c216 419}
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420
421
422static
fc30b18e 423env_item_t *envlist_get(const MEMX char *name, uint_fast8_t flag)
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424{
425 env_item_t *ep;
426
427 ep = envlist_search(name);
428
429 if (ep != NULL && (flag & ENV_GET_VAL)) {
430 if (ep->flags & EF_V_EEP) {
431 char *vp;
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432 int len;
433 len = varval_getlen(ep->val.eep);
434 if (len > CONFIG_SYS_CBSIZE)
435 len = CONFIG_SYS_CBSIZE;
436 vp = xmalloc(len + 1);
437 if (vp) {
438 varval_get(vp, ep->val.eep, len + 1);
439 ep->val.ram = vp;
440 ep->flags &= ~EF_V_EEP;
441 } else
442 printf_P(PSTR("Out of memory!\n"));
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443 }
444 }
445
446 return ep;
447}
448
449
fc30b18e 450char *getenv(const MEMX char *name)
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451{
452 env_item_t *ep;
453 char *ret = NULL;
454
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455 ep = envlist_get(name, ENV_GET_VAL);
456 if (ep != NULL)
457 ret = ep->val.ram;
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458 return ret;
459}
460
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461static
462int env_item_save(env_item_t *ep, uint16_t offset, int space_left)
323398b1 463{
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464 char buf[CONFIG_SYS_ENV_NAMELEN+1];
465 int len;
466 env_item_t e = *ep;
323398b1 467
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468 len = varname_get(buf, ep);
469 if (len == 0)
470 return 0;
471 buf[len++] = '=';
472 space_left -= len;
473
474 if (space_left <= 0)
475 return 0;
476
477 eeprom_update_block(buf, (uint8_t *) offset, len);
478 offset += len;
479
480 if (e.val.ram != NULL) {
481 char c;
482 do {
483 if (e.flags & EF_V_EEP)
484 c = env_get_char(e.val.eep++);
485 else
486 c = *e.val.ram++;
487
488 eeprom_update_byte((uint8_t *) offset, c);
489 offset++;
490 space_left--;
491 len++;
492 } while ((c != '\0') && space_left );
323398b1 493 }
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494 return len;
495}
496
323398b1 497
1da3acc4 498static
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499int saveenv(void)
500{
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501 unsigned int off = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
502 unsigned int off_red = CONFIG_ENV_OFFSET;
503 unsigned int pos;
504 int len, left;
505 uint16_t crc;
506 int rc = 0;
d684c216 507
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508 if (env_valid == 2) {
509 off = CONFIG_ENV_OFFSET;
510 off_red = CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE;
511 }
512
513 eeprom_update_byte((uint8_t *) off + offsetof(env_t, flags), 0xff);
d684c216 514
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515 pos = off + offsetof(env_t, data);
516 left = ENV_SIZE - 1;
517 for (int i = 0 ; i < entrycount; i++) {
518 len = env_item_save(&env_list[i], pos, left);
519 if (len == 0) {
520 return 1;
521 }
522 pos += len;
523 left -= len;
524 }
525 /* terminate list */
526 eeprom_update_byte((uint8_t *) pos, 0);
527 crc = env_crc(off + offsetof(env_t, data));
528 eeprom_update_word((uint16_t *) off + offsetof(env_t, crc), crc);
529 eeprom_update_byte((uint8_t *) off + offsetof(env_t, flags),
530 ACTIVE_FLAG);
531
532 if (rc == 0) {
533 while (entrycount != 0) {
534 env_item_delete(&env_list[entrycount-1]);
535 }
536 eeprom_update_byte((uint8_t *) off_red + offsetof(env_t, flags),
537 OBSOLETE_FLAG);
538 env_valid = (env_valid == 2) ? 1 : 2;
539
540 envlist_import();
541 }
542
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543 return rc;
544}
545
d684c216 546
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547static
548int env_item_print(env_item_t *ep)
d684c216 549{
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550 char buf[CONFIG_SYS_ENV_NAMELEN+1];
551 int len;
552 env_item_t e = *ep;
d684c216 553
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554 varname_get(buf, ep);
555 len = printf_P(PSTR("%s="), buf);
323398b1 556
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557 if (e.val.ram != NULL) {
558 while (1) {
559 char c;
560 if (e.flags & EF_V_EEP)
561 c = env_get_char(e.val.eep++);
562 else
563 c = *e.val.ram++;
564
565 if (c != '\0') {
566 putchar(c);
567 len++;
568 } else
569 break;
570 }
323398b1 571 }
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572 putchar('\n');
573 len ++;
574
575 return len;
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576}
577
578
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579/*
580 * Command interface: print one or all environment variables
581 *
582 * Returns -1 in case of error, or length of printed string
583 */
1da3acc4 584static
fc30b18e 585int env_print(const MEMX char *name)
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586{
587 int len = -1;
588
589 if (name) { /* print a single name */
590
591 env_item_t *ep = envlist_search(name);
592 if (ep != NULL)
593 len = env_item_print(ep);
594
595 } else { /* print whole list */
596 len = 0;
597 for (int i = 0 ; i < entrycount; i++) {
598 len += env_item_print(&env_list[i]);
599 }
600 }
601 return len;
602}
603
1da3acc4 604static
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605int env_print_ramsize(void)
606{
607 int size = 0;
608 uint8_t name_cnt = 0;
609 uint8_t val_cnt = 0;
610
611 for (int i = 0 ; i < entrycount; i++) {
612 if ((env_list[i].flags & EF_N_EEP) == 0 &&
613 (env_list[i].name.ram != NULL)) {
614 name_cnt++;
615 size += strlen(env_list[i].name.ram) + 3;
616 }
617 if ((env_list[i].flags & EF_V_EEP) == 0 &&
618 (env_list[i].val.ram != NULL)) {
619 val_cnt++;
620 size += strlen(env_list[i].val.ram) + 3;
621 }
622 }
623 printf_P(PSTR("%d bytes RAM used for %u names and %u values\n"),
624 size, name_cnt, val_cnt);
625 return size;
626}
d684c216 627
1da3acc4 628
d0581f88 629command_ret_t do_env_print(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
d684c216 630{
d0581f88 631 command_ret_t rc = CMD_RET_SUCCESS;
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632
633 (void) cmdtp; (void) flag;
634
635 if (argc == 1) {
636 /* print all env vars */
d0581f88
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637 int size = env_print(NULL);
638 if (size < 0)
639 return CMD_RET_FAILURE;
d684c216 640 printf_P(PSTR("\nEnvironment size: %d/%d bytes\n"),
d0581f88 641 size, ENV_SIZE);
534e1dfc 642 env_print_ramsize();
d0581f88 643 return CMD_RET_SUCCESS;
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644 }
645
646 /* print selected env vars */
d0581f88 647 for (int i = 1; i < argc; ++i) {
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648 int rc = env_print(argv[i]);
649 if (rc < 0) {
650 printf_P(PSTR("## Error: \"%s\" not defined\n"), argv[i]);
d0581f88 651 rc = CMD_RET_FAILURE;
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652 }
653 }
654
d0581f88 655 return rc;
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656}
657
658
72f58822
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659/**
660 * Set or delete environment variable
661 *
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662 * Set a new environment variable,
663 * or replace or delete an existing one.
72f58822
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664 *
665 * @param flag (not used)
666 * @param argc
667 * @param argv[1] Environment variable to set or delete
668 * if no more args
669 * @param argv[2] ... Value to set it to
670 *
671 * @return 0 if ok, 1 on error
d684c216 672 */
1da3acc4 673static
d0581f88 674command_ret_t _do_env_set(int flag, int argc, char * const argv[])
d684c216 675{
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676 int i, len;
677 char *name, *value, *s;
d684c216
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678 env_item_t e, *ep;
679
680 (void) flag;
681 debug("Initial value for argc=%d\n", argc);
682
683 name = argv[1];
684 value = argv[2];
685
686 if (strchr(name, '=')) {
687 printf_P(PSTR("## Error: illegal character '='"
688 "in variable name \"%s\"\n"), name);
d0581f88 689 return CMD_RET_FAILURE;
d684c216
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690 }
691 if (strlen(name) > CONFIG_SYS_ENV_NAMELEN) {
692 printf_P(PSTR("## Error: Variable name \"%s\" too long. "
693 "(max %d characters)\n"), name, CONFIG_SYS_ENV_NAMELEN);
d0581f88 694 return CMD_RET_FAILURE;
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695 }
696/*
697 env_id++;
698*/
699 /* Delete only ? */
700 if (argc < 3 || argv[2] == NULL) {
701 int rc = envlist_delete(name);
d0581f88 702 return rc ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
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703 }
704
705 /*
706 * Insert / replace new value
707 */
708 for (i = 2, len = 0; i < argc; ++i)
709 len += strlen(argv[i]) + 1;
710
711 value = xmalloc(len);
712 if (value == NULL) {
713 printf_P(PSTR("## Can't malloc %d bytes\n"), len);
d0581f88 714 return CMD_RET_FAILURE;
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715 }
716 for (i = 2, s = value; i < argc; ++i) {
717 char *v = argv[i];
718
719 while ((*s++ = *v++) != '\0')
720 ;
721 *(s - 1) = ' ';
722 }
723 if (s != value)
724 *--s = '\0';
725
726 e.flags = EF_DIRTY;
727 e.name.ram = name;
728 e.val.ram = value;
729 ep = envlist_enter(&e);
730 if (!ep) {
731 printf_P(PSTR("## Error inserting \"%s\" variable.\n"),
732 name);
d0581f88 733 return CMD_RET_FAILURE;
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734 }
735
d0581f88 736 return CMD_RET_SUCCESS;
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737}
738
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739/**
740 * Set an environment variable
741 *
742 * @param varname Environment variable to set
743 * @param varvalue Value to set it to
744 * @return 0 if ok, 1 on error
745 */
1da3acc4 746static
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747int setenv(const char *varname, const char *varvalue)
748{
749 const char * const argv[3] = { NULL, varname, varvalue };
750 int argc = 3;
751
752 if (varvalue == NULL || varvalue[0] == '\0')
753 --argc;
754
d0581f88 755 return (int) _do_env_set(0, argc, (char * const *)argv);
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756}
757
758#if 0
759/**
760 * Set an environment variable to an integer value
761 *
762 * @param varname Environment variable to set
763 * @param value Value to set it to
764 * @return 0 if ok, 1 on error
765 */
766int setenv_ulong(const char *varname, unsigned long value)
767{
768 /* TODO: this should be unsigned */
769 char *str = simple_itoa(value);
770
771 return setenv(varname, str);
772}
773#endif
774
775
776/**
777 * Set an environment variable to an value in hex
778 *
779 * @param varname Environment variable to set
780 * @param value Value to set it to
781 * @return 0 if ok, 1 on error
782 */
fc30b18e 783int setenv_hex(const MEMX char *varname, unsigned long value)
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784{
785 char str[sizeof(unsigned long) *2 + 1];
786
787 sprintf_P(str, PSTR("%lx"), value);
788 return setenv(varname, str);
789}
790
35e9ec0c 791
72f58822 792/**
35e9ec0c 793 * Decode the integer value of an environment variable and return it.
72f58822 794 *
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795 * @param name Name of environemnt variable
796 * @param base Number base to use (normally 10, or 16 for hex)
797 * @param default_val Default value to return if the variable is not
798 * found
799 * @return the decoded value, or default_val if not found
72f58822 800 */
fc30b18e 801unsigned long getenv_ulong(const MEMX char *name, int base, unsigned long default_val)
d684c216 802{
35e9ec0c 803 char buf[16];
d684c216 804 unsigned long value;
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805 char *vp, *endp;
806
807 env_item_t *ep = envlist_search(name);
d684c216 808
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809 if (ep != NULL ) {
810 if (ep->flags & EF_V_EEP) {
811 varval_get(buf, ep->val.eep, sizeof(buf));
812 vp = buf;
813 } else
814 vp = ep->val.ram;
815 if (vp != NULL) {
816 value = strtoul(vp, &endp, base);
817 if (endp != vp)
818 return value;
819 }
820 }
d684c216 821
35e9ec0c 822 return default_val;
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823}
824
35e9ec0c 825
d0581f88 826command_ret_t do_env_set(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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827{
828 (void) cmdtp;
829
830 if (argc < 2)
831 return CMD_RET_USAGE;
832
833 return _do_env_set(flag, argc, argv);
834}
835
836
d0581f88 837command_ret_t do_env_save(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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838{
839 (void) cmdtp; (void) flag; (void) argc; (void) argv;
840
841 printf_P(PSTR("Saving Environment ...\n"));
d0581f88 842 return saveenv() ? CMD_RET_FAILURE : CMD_RET_SUCCESS;
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843}
844
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845#if defined(CONFIG_AUTO_COMPLETE)
846int env_complete(char *var, int maxv, char *cmdv[], int bufsz, char *buf)
847{
848 ENTRY *match;
849 int found, idx;
850
851 idx = 0;
852 found = 0;
853 cmdv[0] = NULL;
854
855 while ((idx = hmatch_r(var, idx, &match, &env_htab))) {
856 int vallen = strlen(match->key) + 1;
857
858 if (found >= maxv - 2 || bufsz < vallen)
859 break;
860
861 cmdv[found++] = buf;
862 memcpy(buf, match->key, vallen);
863 buf += vallen;
864 bufsz -= vallen;
865 }
866
867 qsort(cmdv, found, sizeof(cmdv[0]), strcmp_compar);
868
869 if (idx)
870 cmdv[found++] = "...";
871
872 cmdv[found] = NULL;
873 return found;
874}
875#endif