2 * lib/parser.c - simple parser for mount, etc. options.
4 * This source code is licensed under the GNU General Public License,
5 * Version 2. See the file COPYING for more details.
8 #include <linux/ctype.h>
9 #include <linux/module.h>
10 #include <linux/parser.h>
11 #include <linux/slab.h>
12 #include <linux/string.h>
14 static int match_one(char *s
, char *p
, substring_t args
[])
24 meta
= strchr(p
, '%');
26 return strcmp(p
, s
) == 0;
28 if (strncmp(p
, s
, meta
-p
))
35 len
= simple_strtoul(p
, &p
, 10);
42 if (argc
>= MAX_OPT_ARGS
)
48 if (len
== -1 || len
> strlen(s
))
50 args
[argc
].to
= s
+ len
;
53 simple_strtol(s
, &args
[argc
].to
, 0);
56 simple_strtoul(s
, &args
[argc
].to
, 0);
59 simple_strtoul(s
, &args
[argc
].to
, 8);
62 simple_strtoul(s
, &args
[argc
].to
, 16);
64 if (args
[argc
].to
== args
[argc
].from
)
75 int match_token(char *s
, match_table_t table
, substring_t args
[])
77 struct match_token
*p
;
79 for (p
= table
; !match_one(s
, p
->pattern
, args
) ; p
++)
85 static int match_number(substring_t
*s
, int *result
, int base
)
91 buf
= kmalloc(s
->to
- s
->from
+ 1, GFP_KERNEL
);
94 memcpy(buf
, s
->from
, s
->to
- s
->from
);
95 buf
[s
->to
- s
->from
] = '\0';
96 *result
= simple_strtol(buf
, &endp
, base
);
104 int match_int(substring_t
*s
, int *result
)
106 return match_number(s
, result
, 0);
109 int match_octal(substring_t
*s
, int *result
)
111 return match_number(s
, result
, 8);
114 int match_hex(substring_t
*s
, int *result
)
116 return match_number(s
, result
, 16);
119 void match_strcpy(char *to
, substring_t
*s
)
121 memcpy(to
, s
->from
, s
->to
- s
->from
);
122 to
[s
->to
- s
->from
] = '\0';
125 char *match_strdup(substring_t
*s
)
127 char *p
= kmalloc(s
->to
- s
->from
+ 1, GFP_KERNEL
);
133 EXPORT_SYMBOL(match_token
);
134 EXPORT_SYMBOL(match_int
);
135 EXPORT_SYMBOL(match_octal
);
136 EXPORT_SYMBOL(match_hex
);
137 EXPORT_SYMBOL(match_strcpy
);
138 EXPORT_SYMBOL(match_strdup
);