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36 * Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
37 * All rights reserved.
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39 * modification, are permitted provided that the following conditions are met:
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62 #ifndef _CMDLINE_PARSE_H_
63 #define _CMDLINE_PARSE_H_
65 #include <sys/types.h>
68 #define offsetof(type, field) ((size_t) &( ((type *)0)->field) )
71 /* return status for parsing */
72 #define CMDLINE_PARSE_SUCCESS 0
73 #define CMDLINE_PARSE_AMBIGUOUS -1
74 #define CMDLINE_PARSE_NOMATCH -2
75 #define CMDLINE_PARSE_BAD_ARGS -3
77 /* return status for completion */
78 #define CMDLINE_PARSE_COMPLETE_FINISHED 0
79 #define CMDLINE_PARSE_COMPLETE_AGAIN 1
80 #define CMDLINE_PARSE_COMPLETED_BUFFER 2
83 * Stores a pointer to the ops struct, and the offset: the place to
84 * write the parsed result in the destination structure.
86 struct cmdline_token_hdr {
87 struct cmdline_token_ops *ops;
90 typedef struct cmdline_token_hdr cmdline_parse_token_hdr_t;
93 * A token is defined by this structure.
95 * parse() takes the token as first argument, then the source buffer
96 * starting at the token we want to parse. The 3rd arg is a pointer
97 * where we store the parsed data (as binary). It returns the number of
98 * parsed chars on success and a negative value on error.
100 * complete_get_nb() returns the number of possible values for this
101 * token if completion is possible. If it is NULL or if it returns 0,
102 * no completion is possible.
104 * complete_get_elt() copy in dstbuf (the size is specified in the
105 * parameter) the i-th possible completion for this token. returns 0
106 * on success or and a negative value on error.
108 * get_help() fills the dstbuf with the help for the token. It returns
109 * -1 on error and 0 on success.
111 struct cmdline_token_ops {
112 /** parse(token ptr, buf, res pts) */
113 int (*parse)(cmdline_parse_token_hdr_t *, const char *, void *);
114 /** return the num of possible choices for this token */
115 int (*complete_get_nb)(cmdline_parse_token_hdr_t *);
116 /** return the elt x for this token (token, idx, dstbuf, size) */
117 int (*complete_get_elt)(cmdline_parse_token_hdr_t *, int, char *, unsigned int);
118 /** get help for this token (token, dstbuf, size) */
119 int (*get_help)(cmdline_parse_token_hdr_t *, char *, unsigned int);
124 * Store a instruction, which is a pointer to a callback function and
125 * its parameter that is called when the instruction is parsed, a help
126 * string, and a list of token composing this instruction.
128 struct cmdline_inst {
129 /* f(parsed_struct, data) */
130 void (*f)(void *, struct cmdline *, void *);
133 cmdline_parse_token_hdr_t *tokens[];
135 typedef struct cmdline_inst cmdline_parse_inst_t;
138 * A context is identified by its name, and contains a list of
142 typedef cmdline_parse_inst_t *cmdline_parse_ctx_t;
145 * Try to parse a buffer according to the specified context. The
146 * argument buf must ends with "\n\0". The function returns
147 * CMDLINE_PARSE_AMBIGUOUS, CMDLINE_PARSE_NOMATCH or
148 * CMDLINE_PARSE_BAD_ARGS on error. Else it calls the associated
149 * function (defined in the context) and returns 0
150 * (CMDLINE_PARSE_SUCCESS).
152 int cmdline_parse(struct cmdline *cl, const char *buf);
155 * complete() must be called with *state==0 (try to complete) or
156 * with *state==-1 (just display choices), then called without
157 * modifying *state until it returns CMDLINE_PARSE_COMPLETED_BUFFER or
158 * CMDLINE_PARSE_COMPLETED_BUFFER.
160 * It returns < 0 on error.
163 * - CMDLINE_PARSE_COMPLETED_BUFFER on completion (one possible
164 * choice). In this case, the chars are appended in dst buffer.
165 * - CMDLINE_PARSE_COMPLETE_AGAIN if there is several possible
166 * choices. In this case, you must call the function again,
167 * keeping the value of state intact.
168 * - CMDLINE_PARSE_COMPLETED_BUFFER when the iteration is
169 * finished. The dst is not valid for this last call.
171 * The returned dst buf ends with \0.
173 int cmdline_complete(struct cmdline *cl, const char *buf, int *state,
174 char *dst, unsigned int size);
177 /* return true if(!c || iscomment(c) || isblank(c) ||
179 int cmdline_isendoftoken(char c);
181 #endif /* _CMDLINE_PARSE_H_ */