litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'include/net/netns/generic.h')

0 files changed, 0 insertions, 0 deletions

/* * lib/parser.c - simple parser for mount, etc. options. * * This source code is licensed under the GNU General Public License, * Version 2. See the file COPYING for more details. */ #include <linux/ctype.h> #include <linux/module.h> #include <linux/parser.h> #include <linux/slab.h> #include <linux/string.h> /** * match_one: - Determines if a string matches a simple pattern * @s: the string to examine for presense of the pattern * @p: the string containing the pattern * @args: array of %MAX_OPT_ARGS &substring_t elements. Used to return match * locations. * * Description: Determines if the pattern @p is present in string @s. Can only * match extremely simple token=arg style patterns. If the pattern is found, * the location(s) of the arguments will be returned in the @args array. */ static int match_one(char *s, const char *p, substring_t args[]) { char *meta; int argc = 0; if (!p) return 1; while(1) { int len = -1; meta = strchr(p, '%'); if (!meta) return strcmp(p, s) == 0; if (strncmp(p, s, meta-p)) return 0; s += meta - p; p = meta + 1; if (isdigit(*p)) len = simple_strtoul(p, (char **) &p, 10); else if (*p == '%') { if (*s++ != '%') return 0; p++; continue; } if (argc >= MAX_OPT_ARGS) return 0; args[argc].from = s; switch (*p++) { case 's': if (strlen(s) == 0) return 0; else if (len == -1 || len > strlen(s)) len = strlen(s); args[argc].to = s + len; break; case 'd': simple_strtol(s, &args[argc].to, 0); goto num; case 'u': simple_strtoul(s, &args[argc].to, 0); goto num; case 'o': simple_strtoul(s, &args[argc].to, 8); goto num; case 'x': simple_strtoul(s, &args[argc].to, 16); num: if (args[argc].to == args[argc].from) return 0; break; default: return 0; } s = args[argc].to; argc++; } } /** * match_token: - Find a token (and optional args) in a string * @s: the string to examine for token/argument pairs * @table: match_table_t describing the set of allowed option tokens and the * arguments that may be associated with them. Must be terminated with a * &struct match_token whose pattern is set to the NULL pointer. * @args: array of %MAX_OPT_ARGS &substring_t elements. Used to return match * locations. * * Description: Detects which if any of a set of token strings has been passed * to it. Tokens can include up to MAX_OPT_ARGS instances of basic c-style * format identifiers which will be taken into account when matching the * tokens, and whose locations will be returned in the @args array. */ int match_token(char *s, match_table_t table, substring_t args[]) { const struct match_token *p; for (p = table; !match_one(s, p->pattern, args) ; p++) ; return p->token; } /** * match_number: scan a number in the given base from a substring_t * @s: substring to be scanned * @result: resulting integer on success * @base: base to use when converting string * * Description: Given a &substring_t and a base, attempts to parse the substring * as a number in that base. On success, sets @result to the integer represented * by the string and returns 0. Returns either -ENOMEM or -EINVAL on failure. */ static int match_number(substring_t *s, int *result, int base) { char *endp; char *buf; int ret; buf = kmalloc(s->to - s->from + 1, GFP_KERNEL); if (!buf) return -ENOMEM; memcpy(buf, s->from, s->to - s->from); buf[s->to - s->from] = '\0'; *result = simple_strtol(buf, &endp, base); ret = 0; if (endp == buf) ret = -EINVAL; kfree(buf); return ret; } /** * match_int: - scan a decimal representation of an integer from a substring_t * @s: substring_t to be scanned * @result: resulting integer on success * * Description: Attempts to parse the &substring_t @s as a decimal integer. On * success, sets @result to the integer represented by the string and returns 0. * Returns either -ENOMEM or -EINVAL on failure. */ int match_int(substring_t *s, int *result) { return match_number(s, result, 0); } /** * match_octal: - scan an octal representation of an integer from a substring_t * @s: substring_t to be scanned * @result: resulting integer on success * * Description: Attempts to parse the &substring_t @s as an octal integer. On * success, sets @result to the integer represented by the string and returns * 0. Returns either -ENOMEM or -EINVAL on failure. */ int match_octal(substring_t *s, int *result) { return match_number(s, result, 8); } /** * match_hex: - scan a hex representation of an integer from a substring_t * @s: substring_t to be scanned * @result: resulting integer on success * * Description: Attempts to parse the &substring_t @s as a hexadecimal integer. * On success, sets @result to the integer represented by the string and * returns 0. Returns either -ENOMEM or -EINVAL on failure. */ int match_hex(substring_t *s, int *result) { return match_number(s, result, 16); } /** * match_strcpy: - copies the characters from a substring_t to a string * @to: string to copy characters to. * @s: &substring_t to copy * * Description: Copies the set of characters represented by the given * &substring_t @s to the c-style string @to. Caller guarantees that @to is * large enough to hold the characters of @s. */ void match_strcpy(char *to, const substring_t *s) { memcpy(to, s->from, s->to - s->from); to[s->to - s->from] = '\0'; } /** * match_strdup: - allocate a new string with the contents of a substring_t * @s: &substring_t to copy * * Description: Allocates and returns a string filled with the contents of * the &substring_t @s. The caller is responsible for freeing the returned * string with kfree(). */ char *match_strdup(const substring_t *s) { char *p = kmalloc(s->to - s->from + 1, GFP_KERNEL); if (p) match_strcpy(p, s); return p; } EXPORT_SYMBOL(match_token); EXPORT_SYMBOL(match_int); EXPORT_SYMBOL(match_octal); EXPORT_SYMBOL(match_hex); EXPORT_SYMBOL(match_strcpy); EXPORT_SYMBOL(match_strdup);


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