Subversion Repositories HelenOS

Rev

Rev 3194 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
510 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2005 Jakub Jermar
510 jermar 3
 * All rights reserved.
4
 *
5
 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
9
 * - Redistributions of source code must retain the above copyright
10
 *   notice, this list of conditions and the following disclaimer.
11
 * - Redistributions in binary form must reproduce the above copyright
12
 *   notice, this list of conditions and the following disclaimer in the
13
 *   documentation and/or other materials provided with the distribution.
14
 * - The name of the author may not be used to endorse or promote products
15
 *   derived from this software without specific prior written permission.
16
 *
17
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
 */
28
 
1888 jermar 29
/** @addtogroup genericconsole
1702 cejka 30
 * @{
31
 */
32
 
1264 jermar 33
/**
34
 * @file    kconsole.c
35
 * @brief   Kernel console.
36
 *
37
 * This file contains kernel thread managing the kernel console.
38
 */
39
 
518 jermar 40
#include <console/kconsole.h>
510 jermar 41
#include <console/console.h>
42
#include <console/chardev.h>
596 jermar 43
#include <console/cmd.h>
510 jermar 44
#include <print.h>
517 jermar 45
#include <panic.h>
510 jermar 46
#include <arch/types.h>
788 jermar 47
#include <adt/list.h>
517 jermar 48
#include <arch.h>
49
#include <macros.h>
518 jermar 50
#include <debug.h>
596 jermar 51
#include <func.h>
582 palkovsky 52
#include <symtab.h>
609 palkovsky 53
#include <macros.h>
510 jermar 54
 
517 jermar 55
/** Simple kernel console.
56
 *
57
 * The console is realized by kernel thread kconsole.
518 jermar 58
 * It doesn't understand any useful command on its own,
59
 * but makes it possible for other kernel subsystems to
517 jermar 60
 * register their own commands.
61
 */
62
 
63
/** Locking.
64
 *
65
 * There is a list of cmd_info_t structures. This list
66
 * is protected by cmd_lock spinlock. Note that specially
67
 * the link elements of cmd_info_t are protected by
68
 * this lock.
69
 *
70
 * Each cmd_info_t also has its own lock, which protects
71
 * all elements thereof except the link element.
72
 *
73
 * cmd_lock must be acquired before any cmd_info lock.
74
 * When locking two cmd info structures, structure with
75
 * lower address must be locked first.
76
 */
77
 
623 jermar 78
SPINLOCK_INITIALIZE(cmd_lock);  /**< Lock protecting command list. */
624 jermar 79
LIST_INITIALIZE(cmd_head);  /**< Command list. */
517 jermar 80
 
81
static cmd_info_t *parse_cmdline(char *cmdline, size_t len);
2108 jermar 82
static bool parse_argument(char *cmdline, size_t len, index_t *start,
83
    index_t *end);
601 palkovsky 84
static char history[KCONSOLE_HISTORY][MAX_CMDLINE] = {};
517 jermar 85
 
86
/** Initialize kconsole data structures. */
87
void kconsole_init(void)
88
{
601 palkovsky 89
    int i;
90
 
596 jermar 91
    cmd_init();
2108 jermar 92
    for (i = 0; i < KCONSOLE_HISTORY; i++)
601 palkovsky 93
        history[i][0] = '\0';
517 jermar 94
}
95
 
96
 
97
/** Register kconsole command.
98
 *
99
 * @param cmd Structure describing the command.
100
 *
101
 * @return 0 on failure, 1 on success.
102
 */
103
int cmd_register(cmd_info_t *cmd)
104
{
105
    link_t *cur;
106
 
107
    spinlock_lock(&cmd_lock);
108
 
109
    /*
110
     * Make sure the command is not already listed.
111
     */
112
    for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
113
        cmd_info_t *hlp;
114
 
115
        hlp = list_get_instance(cur, cmd_info_t, link);
116
 
117
        if (hlp == cmd) {
118
            /* The command is already there. */
119
            spinlock_unlock(&cmd_lock);
120
            return 0;
121
        }
122
 
123
        /* Avoid deadlock. */
124
        if (hlp < cmd) {
125
            spinlock_lock(&hlp->lock);
126
            spinlock_lock(&cmd->lock);
127
        } else {
128
            spinlock_lock(&cmd->lock);
129
            spinlock_lock(&hlp->lock);
130
        }
2108 jermar 131
        if ((strncmp(hlp->name, cmd->name, max(strlen(cmd->name),
132
            strlen(hlp->name))) == 0)) {
517 jermar 133
            /* The command is already there. */
134
            spinlock_unlock(&hlp->lock);
135
            spinlock_unlock(&cmd->lock);
136
            spinlock_unlock(&cmd_lock);
137
            return 0;
138
        }
139
 
140
        spinlock_unlock(&hlp->lock);
141
        spinlock_unlock(&cmd->lock);
142
    }
143
 
144
    /*
145
     * Now the command can be added.
146
     */
147
    list_append(&cmd->link, &cmd_head);
148
 
149
    spinlock_unlock(&cmd_lock);
150
    return 1;
151
}
152
 
635 palkovsky 153
/** Print count times a character */
601 palkovsky 154
static void rdln_print_c(char ch, int count)
155
{
156
    int i;
2108 jermar 157
    for (i = 0; i < count; i++)
601 palkovsky 158
        putchar(ch);
159
}
160
 
635 palkovsky 161
/** Insert character to string */
601 palkovsky 162
static void insert_char(char *str, char ch, int pos)
163
{
164
    int i;
165
 
2108 jermar 166
    for (i = strlen(str); i > pos; i--)
167
        str[i] = str[i - 1];
601 palkovsky 168
    str[pos] = ch;
169
}
170
 
640 jermar 171
/** Try to find a command beginning with prefix */
3193 jermar 172
static const char *cmdtab_search_one(const char *name,link_t **startpos)
601 palkovsky 173
{
2113 decky 174
    size_t namelen = strlen(name);
601 palkovsky 175
    const char *curname;
176
 
177
    spinlock_lock(&cmd_lock);
178
 
179
    if (!*startpos)
180
        *startpos = cmd_head.next;
181
 
2108 jermar 182
    for (; *startpos != &cmd_head; *startpos = (*startpos)->next) {
601 palkovsky 183
        cmd_info_t *hlp;
184
        hlp = list_get_instance(*startpos, cmd_info_t, link);
185
 
186
        curname = hlp->name;
187
        if (strlen(curname) < namelen)
188
            continue;
189
        if (strncmp(curname, name, namelen) == 0) {
190
            spinlock_unlock(&cmd_lock);
191
            return curname+namelen;
192
        }
193
    }
194
    spinlock_unlock(&cmd_lock);
195
    return NULL;
196
}
197
 
198
 
199
/** Command completion of the commands
200
 *
201
 * @param name - string to match, changed to hint on exit
202
 * @return number of found matches
203
 */
204
static int cmdtab_compl(char *name)
205
{
3193 jermar 206
    static char output[MAX_SYMBOL_NAME + 1];
601 palkovsky 207
    link_t *startpos = NULL;
208
    const char *foundtxt;
209
    int found = 0;
210
    int i;
211
 
212
    output[0] = '\0';
213
    while ((foundtxt = cmdtab_search_one(name, &startpos))) {
214
        startpos = startpos->next;
215
        if (!found)
3193 jermar 216
            strncpy(output, foundtxt, strlen(foundtxt) + 1);
601 palkovsky 217
        else {
2108 jermar 218
            for (i = 0; output[i] && foundtxt[i] &&
219
                output[i] == foundtxt[i]; i++)
601 palkovsky 220
                ;
221
            output[i] = '\0';
222
        }
223
        found++;
224
    }
225
    if (!found)
226
        return 0;
227
 
602 palkovsky 228
    if (found > 1 && !strlen(output)) {
601 palkovsky 229
        printf("\n");
230
        startpos = NULL;
231
        while ((foundtxt = cmdtab_search_one(name, &startpos))) {
232
            cmd_info_t *hlp;
233
            hlp = list_get_instance(startpos, cmd_info_t, link);
234
            printf("%s - %s\n", hlp->name, hlp->description);
235
            startpos = startpos->next;
236
        }
237
    }
238
    strncpy(name, output, MAX_SYMBOL_NAME);
239
    return found;
240
 
241
}
242
 
3193 jermar 243
static char *clever_readline(const char *prompt, chardev_t *input)
601 palkovsky 244
{
245
    static int histposition = 0;
246
 
3193 jermar 247
    static char tmp[MAX_CMDLINE + 1];
601 palkovsky 248
    int curlen = 0, position = 0;
249
    char *current = history[histposition];
250
    int i;
606 palkovsky 251
    char mod; /* Command Modifier */
601 palkovsky 252
    char c;
253
 
254
    printf("%s> ", prompt);
255
    while (1) {
256
        c = _getc(input);
257
        if (c == '\n') {
258
            putchar(c);
259
            break;
3193 jermar 260
        }
261
        if (c == '\b') { /* Backspace */
601 palkovsky 262
            if (position == 0)
263
                continue;
2108 jermar 264
            for (i = position; i < curlen; i++)
265
                current[i - 1] = current[i];
601 palkovsky 266
            curlen--;
267
            position--;
268
            putchar('\b');
2108 jermar 269
            for (i = position; i < curlen; i++)
601 palkovsky 270
                putchar(current[i]);
271
            putchar(' ');
2108 jermar 272
            rdln_print_c('\b', curlen - position + 1);
601 palkovsky 273
            continue;
274
        }
607 palkovsky 275
        if (c == '\t') { /* Tabulator */
601 palkovsky 276
            int found;
277
 
278
            /* Move to the end of the word */
2108 jermar 279
            for (; position < curlen && current[position] != ' ';
280
                position++)
601 palkovsky 281
                putchar(current[position]);
282
            /* Copy to tmp last word */
2108 jermar 283
            for (i = position - 1; i >= 0 && current[i] != ' '; i--)
601 palkovsky 284
                ;
285
            /* If word begins with * or &, skip it */
286
            if (tmp[0] == '*' || tmp[0] == '&')
2108 jermar 287
                for (i = 1; tmp[i]; i++)
288
                    tmp[i - 1] = tmp[i];
601 palkovsky 289
            i++; /* I is at the start of the word */
2108 jermar 290
            strncpy(tmp, current + i, position - i + 1);
601 palkovsky 291
 
2108 jermar 292
            if (i == 0) { /* Command completion */
601 palkovsky 293
                found = cmdtab_compl(tmp);
294
            } else { /* Symtab completion */
295
                found = symtab_compl(tmp);
296
            }
297
 
298
            if (found == 0)
299
                continue;
2108 jermar 300
            for (i = 0; tmp[i] && curlen < MAX_CMDLINE;
301
                i++, curlen++)
302
                insert_char(current, tmp[i], i + position);
602 palkovsky 303
 
2108 jermar 304
            if (strlen(tmp) || found == 1) { /* If we have a hint */
305
                for (i = position; i < curlen; i++)
601 palkovsky 306
                    putchar(current[i]);
307
                position += strlen(tmp);
308
                /* Add space to end */
2108 jermar 309
                if (found == 1 && position == curlen &&
602 palkovsky 310
                    curlen < MAX_CMDLINE) {
601 palkovsky 311
                    current[position] = ' ';
312
                    curlen++;
313
                    position++;
314
                    putchar(' ');
315
                }
602 palkovsky 316
            } else { /* No hint, table was printed */
601 palkovsky 317
                printf("%s> ", prompt);
2108 jermar 318
                for (i = 0; i < curlen; i++)
601 palkovsky 319
                    putchar(current[i]);
320
                position += strlen(tmp);
321
            }
2108 jermar 322
            rdln_print_c('\b', curlen - position);
601 palkovsky 323
            continue;
324
        }
607 palkovsky 325
        if (c == 0x1b) { /* Special command */
606 palkovsky 326
            mod = _getc(input);
601 palkovsky 327
            c = _getc(input);
606 palkovsky 328
 
329
            if (mod != 0x5b && mod != 0x4f)
601 palkovsky 330
                continue;
606 palkovsky 331
 
332
            if (c == 0x33 && _getc(input) == 0x7e) {
607 palkovsky 333
                /* Delete */
606 palkovsky 334
                if (position == curlen)
335
                    continue;
2108 jermar 336
                for (i = position + 1; i < curlen; i++) {
606 palkovsky 337
                    putchar(current[i]);
2108 jermar 338
                    current[i - 1] = current[i];
606 palkovsky 339
                }
340
                putchar(' ');
2108 jermar 341
                rdln_print_c('\b', curlen - position);
606 palkovsky 342
                curlen--;
2108 jermar 343
            } else if (c == 0x48) { /* Home */
344
                rdln_print_c('\b', position);
606 palkovsky 345
                position = 0;
2108 jermar 346
            } else if (c == 0x46) {  /* End */
347
                for (i = position; i < curlen; i++)
606 palkovsky 348
                    putchar(current[i]);
349
                position = curlen;
2108 jermar 350
            } else if (c == 0x44) { /* Left */
601 palkovsky 351
                if (position > 0) {
352
                    putchar('\b');
353
                    position--;
354
                }
355
                continue;
2108 jermar 356
            } else if (c == 0x43) { /* Right */
601 palkovsky 357
                if (position < curlen) {
358
                    putchar(current[position]);
359
                    position++;
360
                }
361
                continue;
2108 jermar 362
            } else if (c == 0x41 || c == 0x42) {
363
                                /* Up, down */
364
                rdln_print_c('\b', position);
365
                rdln_print_c(' ', curlen);
366
                rdln_print_c('\b', curlen);
607 palkovsky 367
                if (c == 0x41) /* Up */
601 palkovsky 368
                    histposition--;
369
                else
370
                    histposition++;
2108 jermar 371
                if (histposition < 0) {
372
                    histposition = KCONSOLE_HISTORY - 1;
373
                } else {
374
                    histposition =
375
                        histposition % KCONSOLE_HISTORY;
376
                }
601 palkovsky 377
                current = history[histposition];
378
                printf("%s", current);
379
                curlen = strlen(current);
380
                position = curlen;
381
                continue;
382
            }
383
            continue;
384
        }
385
        if (curlen >= MAX_CMDLINE)
386
            continue;
387
 
388
        insert_char(current, c, position);
389
 
390
        curlen++;
2108 jermar 391
        for (i = position; i < curlen; i++)
601 palkovsky 392
            putchar(current[i]);
393
        position++;
2108 jermar 394
        rdln_print_c('\b',curlen - position);
601 palkovsky 395
    }
603 palkovsky 396
    if (curlen) {
397
        histposition++;
398
        histposition = histposition % KCONSOLE_HISTORY;
399
    }
601 palkovsky 400
    current[curlen] = '\0';
401
    return current;
402
}
403
 
510 jermar 404
/** Kernel console managing thread.
405
 *
1708 jermar 406
 * @param prompt Kernel console prompt (e.g kconsole/panic).
510 jermar 407
 */
609 palkovsky 408
void kconsole(void *prompt)
510 jermar 409
{
517 jermar 410
    cmd_info_t *cmd_info;
411
    count_t len;
601 palkovsky 412
    char *cmdline;
510 jermar 413
 
414
    if (!stdin) {
2462 jermar 415
        printf("%s: no stdin\n", __func__);
510 jermar 416
        return;
417
    }
418
 
419
    while (true) {
2113 decky 420
        cmdline = clever_readline((char *) prompt, stdin);
601 palkovsky 421
        len = strlen(cmdline);
422
        if (!len)
518 jermar 423
            continue;
517 jermar 424
        cmd_info = parse_cmdline(cmdline, len);
518 jermar 425
        if (!cmd_info)
517 jermar 426
            continue;
2108 jermar 427
        if (strncmp(cmd_info->name, "exit",
428
            min(strlen(cmd_info->name), 5)) == 0)
609 palkovsky 429
            break;
517 jermar 430
        (void) cmd_info->func(cmd_info->argv);
510 jermar 431
    }
432
}
517 jermar 433
 
1780 jermar 434
static int parse_int_arg(char *text, size_t len, unative_t *result)
585 palkovsky 435
{
1972 jermar 436
    static char symname[MAX_SYMBOL_NAME];
1780 jermar 437
    uintptr_t symaddr;
585 palkovsky 438
    bool isaddr = false;
589 palkovsky 439
    bool isptr = false;
585 palkovsky 440
 
441
    /* If we get a name, try to find it in symbol table */
931 palkovsky 442
    if (text[0] == '&') {
443
        isaddr = true;
2108 jermar 444
        text++;
445
        len--;
931 palkovsky 446
    } else if (text[0] == '*') {
447
        isptr = true;
2108 jermar 448
        text++;
449
        len--;
931 palkovsky 450
    }
614 palkovsky 451
    if (text[0] < '0' || text[0] > '9') {
2108 jermar 452
        strncpy(symname, text, min(len + 1, MAX_SYMBOL_NAME));
585 palkovsky 453
        symaddr = get_symbol_addr(symname);
454
        if (!symaddr) {
2108 jermar 455
            printf("Symbol %s not found.\n", symname);
585 palkovsky 456
            return -1;
457
        }
1780 jermar 458
        if (symaddr == (uintptr_t) -1) {
2108 jermar 459
            printf("Duplicate symbol %s.\n", symname);
585 palkovsky 460
            symtab_print_search(symname);
461
            return -1;
462
        }
932 palkovsky 463
        if (isaddr)
1780 jermar 464
            *result = (unative_t)symaddr;
932 palkovsky 465
        else if (isptr)
1780 jermar 466
            *result = **((unative_t **)symaddr);
932 palkovsky 467
        else
1780 jermar 468
            *result = *((unative_t *)symaddr);
932 palkovsky 469
    } else { /* It's a number - convert it */
585 palkovsky 470
        *result = atoi(text);
932 palkovsky 471
        if (isptr)
1780 jermar 472
            *result = *((unative_t *)*result);
932 palkovsky 473
    }
931 palkovsky 474
 
585 palkovsky 475
    return 0;
476
}
477
 
517 jermar 478
/** Parse command line.
479
 *
480
 * @param cmdline Command line as read from input device.
481
 * @param len Command line length.
482
 *
483
 * @return Structure describing the command.
484
 */
485
cmd_info_t *parse_cmdline(char *cmdline, size_t len)
486
{
487
    index_t start = 0, end = 0;
488
    cmd_info_t *cmd = NULL;
489
    link_t *cur;
2113 decky 490
    count_t i;
668 bondari 491
    int error = 0;
517 jermar 492
 
518 jermar 493
    if (!parse_argument(cmdline, len, &start, &end)) {
517 jermar 494
        /* Command line did not contain alphanumeric word. */
495
        return NULL;
496
    }
497
 
498
    spinlock_lock(&cmd_lock);
499
 
500
    for (cur = cmd_head.next; cur != &cmd_head; cur = cur->next) {
501
        cmd_info_t *hlp;
502
 
503
        hlp = list_get_instance(cur, cmd_info_t, link);
504
        spinlock_lock(&hlp->lock);
505
 
635 palkovsky 506
        if (strncmp(hlp->name, &cmdline[start], max(strlen(hlp->name),
2108 jermar 507
            end - start + 1)) == 0) {
517 jermar 508
            cmd = hlp;
509
            break;
510
        }
511
 
512
        spinlock_unlock(&hlp->lock);
513
    }
514
 
515
    spinlock_unlock(&cmd_lock);
516
 
517
    if (!cmd) {
518
        /* Unknown command. */
518 jermar 519
        printf("Unknown command.\n");
517 jermar 520
        return NULL;
521
    }
522
 
523
    /* cmd == hlp is locked */
524
 
525
    /*
526
     * The command line must be further analyzed and
527
     * the parameters therefrom must be matched and
528
     * converted to those specified in the cmd info
529
     * structure.
530
     */
518 jermar 531
 
532
    for (i = 0; i < cmd->argc; i++) {
533
        char *buf;
534
        start = end + 1;
535
        if (!parse_argument(cmdline, len, &start, &end)) {
536
            printf("Too few arguments.\n");
537
            spinlock_unlock(&cmd->lock);
538
            return NULL;
539
        }
540
 
668 bondari 541
        error = 0;
518 jermar 542
        switch (cmd->argv[i].type) {
582 palkovsky 543
        case ARG_TYPE_STRING:
2113 decky 544
            buf = (char *) cmd->argv[i].buffer;
545
            strncpy(buf, (const char *) &cmdline[start],
2108 jermar 546
                min((end - start) + 2, cmd->argv[i].len));
3193 jermar 547
            buf[min((end - start) + 1, cmd->argv[i].len - 1)] =
548
                '\0';
518 jermar 549
            break;
585 palkovsky 550
        case ARG_TYPE_INT:
2108 jermar 551
            if (parse_int_arg(cmdline + start, end - start + 1,
552
                &cmd->argv[i].intval))
668 bondari 553
                error = 1;
518 jermar 554
            break;
585 palkovsky 555
        case ARG_TYPE_VAR:
2108 jermar 556
            if (start != end && cmdline[start] == '"' &&
557
                cmdline[end] == '"') {
2113 decky 558
                buf = (char *) cmd->argv[i].buffer;
2108 jermar 559
                strncpy(buf, (const char *) &cmdline[start + 1],
560
                    min((end-start), cmd->argv[i].len));
561
                buf[min((end - start), cmd->argv[i].len - 1)] =
562
                    '\0';
1780 jermar 563
                cmd->argv[i].intval = (unative_t) buf;
585 palkovsky 564
                cmd->argv[i].vartype = ARG_TYPE_STRING;
3193 jermar 565
            } else if (!parse_int_arg(cmdline + start,
566
                end - start + 1, &cmd->argv[i].intval)) {
585 palkovsky 567
                cmd->argv[i].vartype = ARG_TYPE_INT;
2108 jermar 568
            } else {
585 palkovsky 569
                printf("Unrecognized variable argument.\n");
668 bondari 570
                error = 1;
582 palkovsky 571
            }
585 palkovsky 572
            break;
582 palkovsky 573
        case ARG_TYPE_INVALID:
574
        default:
575
            printf("invalid argument type\n");
668 bondari 576
            error = 1;
582 palkovsky 577
            break;
518 jermar 578
        }
579
    }
517 jermar 580
 
668 bondari 581
    if (error) {
582
        spinlock_unlock(&cmd->lock);
583
        return NULL;
584
    }
585
 
518 jermar 586
    start = end + 1;
587
    if (parse_argument(cmdline, len, &start, &end)) {
588
        printf("Too many arguments.\n");
589
        spinlock_unlock(&cmd->lock);
590
        return NULL;
591
    }
592
 
517 jermar 593
    spinlock_unlock(&cmd->lock);
594
    return cmd;
595
}
596
 
518 jermar 597
/** Parse argument.
598
 *
599
 * Find start and end positions of command line argument.
600
 *
601
 * @param cmdline Command line as read from the input device.
602
 * @param len Number of characters in cmdline.
603
 * @param start On entry, 'start' contains pointer to the index
604
 *        of first unprocessed character of cmdline.
605
 *        On successful exit, it marks beginning of the next argument.
606
 * @param end Undefined on entry. On exit, 'end' points to the last character
607
 *        of the next argument.
608
 *
609
 * @return false on failure, true on success.
610
 */
611
bool parse_argument(char *cmdline, size_t len, index_t *start, index_t *end)
612
{
2113 decky 613
    index_t i;
518 jermar 614
    bool found_start = false;
615
 
616
    ASSERT(start != NULL);
617
    ASSERT(end != NULL);
618
 
619
    for (i = *start; i < len; i++) {
620
        if (!found_start) {
2572 jermar 621
            if (isspace(cmdline[i]))
518 jermar 622
                (*start)++;
623
            else
624
                found_start = true;
625
        } else {
2572 jermar 626
            if (isspace(cmdline[i]))
518 jermar 627
                break;
628
        }
629
    }
630
    *end = i - 1;
631
 
632
    return found_start;
633
}
1702 cejka 634
 
1888 jermar 635
/** @}
1702 cejka 636
 */