linux-5.10/lib/parser.c

1 // SPDX-License-Identifier: GPL-2.0-only
3  * lib/parser.c - simple parser for mount, etc. options.
14  * match_one: - Determines if a string matches a simple pattern
33 		int len = -1;  in match_one()
38 		if (strncmp(p, s, meta-p))  in match_one()
41 		s += meta - p;  in match_one()
63 			if (len == -1 || len > str_len)  in match_one()
70 			goto num;  in match_one()
73 			goto num;  in match_one()
76 			goto num;  in match_one()
79 		num:  in match_one()
92  * match_token: - Find a token (and optional args) in a string
100  * Description: Detects which if any of a set of token strings has been passed
101  * to it. Tokens can include up to MAX_OPT_ARGS instances of basic c-style
109 	for (p = table; !match_one(s, p->pattern, args) ; p++)  in match_token()
112 	return p->token;  in match_token()
124  * by the string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
135 		return -ENOMEM;  in match_number()
140 		ret = -EINVAL;  in match_number()
142 		ret = -ERANGE;  in match_number()
157  * by the string and returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
167 		return -ENOMEM;  in match_u64int()
177  * match_int: - scan a decimal representation of an integer from a substring_t
183  * Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
192  * match_u64: - scan a decimal representation of a u64 from
200  * Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
209  * match_octal: - scan an octal representation of an integer from a substring_t
215  * 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
224  * match_hex: - scan a hex representation of an integer from a substring_t
230  * returns 0. Returns -ENOMEM, -EINVAL, or -ERANGE on failure.
239  * match_wildcard: - parse if a string matches given wildcard pattern
245  *   '*' - matches zero or more characters
246  *   '?' - matches one character
290  * match_strlcpy: - Copy the characters from a substring_t to a sized buffer
296  * c-style string @dest.  Copy no more than @size - 1 characters, plus
301 	size_t ret = src->to - src->from;  in match_strlcpy()
304 		size_t len = ret >= size ? size - 1 : ret;  in match_strlcpy()
305 		memcpy(dest, src->from, len);  in match_strlcpy()
313  * match_strdup: - allocate a new string with the contents of a substring_t
322 	return kmemdup_nul(s->from, s->to - s->from, GFP_KERNEL);  in match_strdup()