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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2012, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * String manipulation functions.
38 * libcfs/libcfs/libcfs_string.c
40 * Author: Nathan Rutman <nathan.rutman@sun.com>
43 #include <libcfs/libcfs.h>
45 char *cfs_strrstr(const char *haystack, const char *needle)
49 if (unlikely(haystack == NULL || needle == NULL))
52 if (strlen(needle) == 1)
53 return strrchr(haystack, needle[0]);
55 ptr = strstr(haystack, needle);
60 tmp = strstr(&ptr[1], needle);
70 EXPORT_SYMBOL(cfs_strrstr);
72 /* Convert a text string to a bitmask */
73 int cfs_str2mask(const char *str, const char *(*bit2str)(int bit),
74 int *oldmask, int minmask, int allmask)
78 int newmask = minmask, i, len, found = 0;
81 /* <str> must be a list of tokens separated by whitespace
82 * and optionally an operator ('+' or '-'). If an operator
83 * appears first in <str>, '*oldmask' is used as the starting point
84 * (relative), otherwise minmask is used (absolute). An operator
85 * applies to all following tokens up to the next operator. */
91 if (*str == '+' || *str == '-') {
94 /* only if first token is relative */
98 if (*str == 0) /* trailing op */
102 /* find token length */
103 for (len = 0; str[len] != 0 && !isspace(str[len]) &&
104 str[len] != '+' && str[len] != '-'; len++);
108 for (i = 0; i < 32; i++) {
109 debugstr = bit2str(i);
110 if (debugstr != NULL &&
111 strlen(debugstr) == len &&
112 strncasecmp(str, debugstr, len) == 0) {
114 newmask &= ~(1 << i);
121 if (!found && len == 3 &&
122 (strncasecmp(str, "ALL", len) == 0)) {
130 CWARN("unknown mask '%.*s'.\n"
131 "mask usage: [+|-]<all|type> ...\n", len, str);
140 EXPORT_SYMBOL(cfs_str2mask);
142 /* get the first string out of @str */
143 char *cfs_firststr(char *str, size_t size)
148 /* trim leading spaces */
149 while (i < size && *str && isspace(*str)) {
154 /* string with all spaces */
159 while (i < size && *end != '\0' && !isspace(*end)) {
168 EXPORT_SYMBOL(cfs_firststr);
171 cfs_trimwhite(char *str)
175 while (isspace(*str))
178 end = str + strlen(str);
180 if (!isspace(end[-1]))
188 EXPORT_SYMBOL(cfs_trimwhite);
191 * Extracts tokens from strings.
193 * Looks for \a delim in string \a next, sets \a res to point to
194 * substring before the delimiter, sets \a next right after the found
197 * \retval 1 if \a res points to a string of non-whitespace characters
198 * \retval 0 otherwise
201 cfs_gettok(struct cfs_lstr *next, char delim, struct cfs_lstr *res)
205 if (next->ls_str == NULL)
208 /* skip leading white spaces */
209 while (next->ls_len) {
210 if (!isspace(*next->ls_str))
216 if (next->ls_len == 0) /* whitespaces only */
219 if (*next->ls_str == delim) {
220 /* first non-writespace is the delimiter */
224 res->ls_str = next->ls_str;
225 end = memchr(next->ls_str, delim, next->ls_len);
227 /* there is no the delimeter in the string */
228 end = next->ls_str + next->ls_len;
231 next->ls_str = end + 1;
232 next->ls_len -= (end - res->ls_str + 1);
235 /* skip ending whitespaces */
236 while (--end != res->ls_str) {
241 res->ls_len = end - res->ls_str + 1;
244 EXPORT_SYMBOL(cfs_gettok);
247 * Converts string to integer.
249 * Accepts decimal and hexadecimal number recordings.
251 * \retval 1 if first \a nob chars of \a str convert to decimal or
252 * hexadecimal integer in the range [\a min, \a max]
253 * \retval 0 otherwise
256 cfs_str2num_check(char *str, int nob, unsigned *num,
257 unsigned min, unsigned max)
261 *num = simple_strtoul(str, &endp, 0);
265 for (; endp < str + nob; endp++) {
270 return (*num >= min && *num <= max);
272 EXPORT_SYMBOL(cfs_str2num_check);
275 * Parses \<range_expr\> token of the syntax. If \a bracketed is false,
276 * \a src should only have a single token which can be \<number\> or \*
278 * \retval pointer to allocated range_expr and initialized
279 * range_expr::re_lo, range_expr::re_hi and range_expr:re_stride if \a
282 * \<number\> '-' \<number\> |
283 * \<number\> '-' \<number\> '/' \<number\>
284 * \retval 0 will be returned if it can be parsed, otherwise -EINVAL or
285 * -ENOMEM will be returned.
288 cfs_range_expr_parse(struct cfs_lstr *src, unsigned min, unsigned max,
289 int bracketed, struct cfs_range_expr **expr)
291 struct cfs_range_expr *re;
294 LIBCFS_ALLOC(re, sizeof(*re));
298 if (src->ls_len == 1 && src->ls_str[0] == '*') {
305 if (cfs_str2num_check(src->ls_str, src->ls_len,
306 &re->re_lo, min, max)) {
307 /* <number> is parsed */
308 re->re_hi = re->re_lo;
313 if (!bracketed || !cfs_gettok(src, '-', &tok))
316 if (!cfs_str2num_check(tok.ls_str, tok.ls_len,
317 &re->re_lo, min, max))
321 if (cfs_str2num_check(src->ls_str, src->ls_len,
322 &re->re_hi, min, max)) {
323 /* <number> - <number> is parsed */
328 /* go to check <number> '-' <number> '/' <number> */
329 if (cfs_gettok(src, '/', &tok)) {
330 if (!cfs_str2num_check(tok.ls_str, tok.ls_len,
331 &re->re_hi, min, max))
334 /* <number> - <number> / ... */
335 if (cfs_str2num_check(src->ls_str, src->ls_len,
336 &re->re_stride, min, max)) {
337 /* <number> - <number> / <number> is parsed */
347 LIBCFS_FREE(re, sizeof(*re));
350 EXPORT_SYMBOL(cfs_range_expr_parse);
353 * Print the range expression \a re into specified \a buffer.
354 * If \a bracketed is true, expression does not need additional
357 * \retval number of characters written
360 cfs_range_expr_print(char *buffer, int count, struct cfs_range_expr *expr,
370 if (expr->re_lo == expr->re_hi)
371 i = scnprintf(buffer, count, "%u", expr->re_lo);
372 else if (expr->re_stride == 1)
373 i = scnprintf(buffer, count, "%s%u-%u%s",
374 s, expr->re_lo, expr->re_hi, e);
376 i = scnprintf(buffer, count, "%s%u-%u/%u%s",
377 s, expr->re_lo, expr->re_hi,
383 * Print a list of range expressions (\a expr_list) into specified \a buffer.
384 * If the list contains several expressions, separate them with comma
385 * and surround the list with brackets.
387 * \retval number of characters written
390 cfs_expr_list_print(char *buffer, int count, struct cfs_expr_list *expr_list)
392 struct cfs_range_expr *expr;
399 list_for_each_entry(expr, &expr_list->el_exprs, re_link)
403 i += scnprintf(buffer + i, count - i, "[");
405 list_for_each_entry(expr, &expr_list->el_exprs, re_link) {
407 i += scnprintf(buffer + i, count - i, ",");
408 i += cfs_range_expr_print(buffer + i, count - i, expr,
413 i += scnprintf(buffer + i, count - i, "]");
417 EXPORT_SYMBOL(cfs_expr_list_print);
420 * Matches value (\a value) against ranges expression list \a expr_list.
422 * \retval 1 if \a value matches
423 * \retval 0 otherwise
426 cfs_expr_list_match(__u32 value, struct cfs_expr_list *expr_list)
428 struct cfs_range_expr *expr;
430 list_for_each_entry(expr, &expr_list->el_exprs, re_link) {
431 if (value >= expr->re_lo && value <= expr->re_hi &&
432 ((value - expr->re_lo) % expr->re_stride) == 0)
438 EXPORT_SYMBOL(cfs_expr_list_match);
441 * Convert express list (\a expr_list) to an array of all matched values
443 * \retval N N is total number of all matched values
444 * \retval 0 if expression list is empty
445 * \retval < 0 for failure
448 cfs_expr_list_values(struct cfs_expr_list *expr_list, int max, __u32 **valpp)
450 struct cfs_range_expr *expr;
455 list_for_each_entry(expr, &expr_list->el_exprs, re_link) {
456 for (i = expr->re_lo; i <= expr->re_hi; i++) {
457 if (((i - expr->re_lo) % expr->re_stride) == 0)
462 if (count == 0) /* empty expression list */
466 CERROR("Number of values %d exceeds max allowed %d\n",
471 LIBCFS_ALLOC(val, sizeof(val[0]) * count);
476 list_for_each_entry(expr, &expr_list->el_exprs, re_link) {
477 for (i = expr->re_lo; i <= expr->re_hi; i++) {
478 if (((i - expr->re_lo) % expr->re_stride) == 0)
486 EXPORT_SYMBOL(cfs_expr_list_values);
489 * Frees cfs_range_expr structures of \a expr_list.
494 cfs_expr_list_free(struct cfs_expr_list *expr_list)
496 while (!list_empty(&expr_list->el_exprs)) {
497 struct cfs_range_expr *expr;
499 expr = list_entry(expr_list->el_exprs.next,
500 struct cfs_range_expr, re_link);
501 list_del(&expr->re_link);
502 LIBCFS_FREE(expr, sizeof(*expr));
505 LIBCFS_FREE(expr_list, sizeof(*expr_list));
507 EXPORT_SYMBOL(cfs_expr_list_free);
510 * Parses \<cfs_expr_list\> token of the syntax.
512 * \retval 0 if \a str parses to \<number\> | \<expr_list\>
513 * \retval -errno otherwise
516 cfs_expr_list_parse(char *str, int len, unsigned min, unsigned max,
517 struct cfs_expr_list **elpp)
519 struct cfs_expr_list *expr_list;
520 struct cfs_range_expr *expr;
524 LIBCFS_ALLOC(expr_list, sizeof(*expr_list));
525 if (expr_list == NULL)
531 INIT_LIST_HEAD(&expr_list->el_exprs);
533 if (src.ls_str[0] == '[' &&
534 src.ls_str[src.ls_len - 1] == ']') {
539 while (src.ls_str != NULL) {
542 if (!cfs_gettok(&src, ',', &tok)) {
547 rc = cfs_range_expr_parse(&tok, min, max, 1, &expr);
551 list_add_tail(&expr->re_link,
552 &expr_list->el_exprs);
555 rc = cfs_range_expr_parse(&src, min, max, 0, &expr);
557 list_add_tail(&expr->re_link,
558 &expr_list->el_exprs);
563 cfs_expr_list_free(expr_list);
569 EXPORT_SYMBOL(cfs_expr_list_parse);
572 * Frees cfs_expr_list structures of \a list.
574 * For each struct cfs_expr_list structure found on \a list it frees
575 * range_expr list attached to it and frees the cfs_expr_list itself.
580 cfs_expr_list_free_list(struct list_head *list)
582 struct cfs_expr_list *el;
584 while (!list_empty(list)) {
585 el = list_entry(list->next,
586 struct cfs_expr_list, el_link);
587 list_del(&el->el_link);
588 cfs_expr_list_free(el);
591 EXPORT_SYMBOL(cfs_expr_list_free_list);
594 cfs_ip_addr_parse(char *str, int len, struct list_head *list)
596 struct cfs_expr_list *el;
605 while (src.ls_str != NULL) {
608 if (!cfs_gettok(&src, '.', &res)) {
613 rc = cfs_expr_list_parse(res.ls_str, res.ls_len, 0, 255, &el);
617 list_add_tail(&el->el_link, list);
626 cfs_expr_list_free_list(list);
630 EXPORT_SYMBOL(cfs_ip_addr_parse);
633 * Matches address (\a addr) against address set encoded in \a list.
635 * \retval 1 if \a addr matches
636 * \retval 0 otherwise
639 cfs_ip_addr_match(__u32 addr, struct list_head *list)
641 struct cfs_expr_list *el;
644 list_for_each_entry_reverse(el, list, el_link) {
645 if (!cfs_expr_list_match(addr & 0xff, el))
653 EXPORT_SYMBOL(cfs_ip_addr_match);