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38 * modification, are permitted provided that the following conditions are met:
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61 #ifndef _CMDLINE_PARSE_H_
62 #define _CMDLINE_PARSE_H_
69 #define offsetof(type, field) ((size_t) &( ((type *)0)->field) )
72 /* return status for parsing */
73 #define CMDLINE_PARSE_SUCCESS 0
74 #define CMDLINE_PARSE_AMBIGUOUS -1
75 #define CMDLINE_PARSE_NOMATCH -2
76 #define CMDLINE_PARSE_BAD_ARGS -3
78 /* return status for completion */
79 #define CMDLINE_PARSE_COMPLETE_FINISHED 0
80 #define CMDLINE_PARSE_COMPLETE_AGAIN 1
81 #define CMDLINE_PARSE_COMPLETED_BUFFER 2
84 * Stores a pointer to the ops struct, and the offset: the place to
85 * write the parsed result in the destination structure.
87 struct cmdline_token_hdr {
88 struct cmdline_token_ops *ops;
91 typedef struct cmdline_token_hdr cmdline_parse_token_hdr_t;
94 * A token is defined by this structure.
96 * parse() takes the token as first argument, then the source buffer
97 * starting at the token we want to parse. The 3rd arg is a pointer
98 * where we store the parsed data (as binary). It returns the number of
99 * parsed chars on success and a negative value on error.
101 * complete_get_nb() returns the number of possible values for this
102 * token if completion is possible. If it is NULL or if it returns 0,
103 * no completion is possible.
105 * complete_get_elt() copy in dstbuf (the size is specified in the
106 * parameter) the i-th possible completion for this token. returns 0
107 * on success or and a negative value on error.
109 * get_help() fills the dstbuf with the help for the token. It returns
110 * -1 on error and 0 on success.
112 struct cmdline_token_ops {
113 /** parse(token ptr, buf, res pts) */
114 int (*parse)(cmdline_parse_token_hdr_t *, const char *, void *);
115 /** return the num of possible choices for this token */
116 int (*complete_get_nb)(cmdline_parse_token_hdr_t *);
117 /** return the elt x for this token (token, idx, dstbuf, size) */
118 int (*complete_get_elt)(cmdline_parse_token_hdr_t *, int, char *, unsigned int);
119 /** get help for this token (token, dstbuf, size) */
120 int (*get_help)(cmdline_parse_token_hdr_t *, char *, unsigned int);
125 * Store a instruction, which is a pointer to a callback function and
126 * its parameter that is called when the instruction is parsed, a help
127 * string, and a list of token composing this instruction.
129 struct cmdline_inst {
130 /* f(parsed_struct, data) */
131 void (*f)(void *, struct cmdline *, void *);
133 const char *help_str;
134 cmdline_parse_token_hdr_t *tokens[];
136 typedef struct cmdline_inst cmdline_parse_inst_t;
139 * A context is identified by its name, and contains a list of
143 typedef cmdline_parse_inst_t *cmdline_parse_ctx_t;
146 * Try to parse a buffer according to the specified context. The
147 * argument buf must ends with "\n\0". The function returns
148 * CMDLINE_PARSE_AMBIGUOUS, CMDLINE_PARSE_NOMATCH or
149 * CMDLINE_PARSE_BAD_ARGS on error. Else it calls the associated
150 * function (defined in the context) and returns 0
151 * (CMDLINE_PARSE_SUCCESS).
153 int cmdline_parse(struct cmdline *cl, const char *buf);
156 * complete() must be called with *state==0 (try to complete) or
157 * with *state==-1 (just display choices), then called without
158 * modifying *state until it returns CMDLINE_PARSE_COMPLETED_BUFFER or
159 * CMDLINE_PARSE_COMPLETED_BUFFER.
161 * It returns < 0 on error.
164 * - CMDLINE_PARSE_COMPLETED_BUFFER on completion (one possible
165 * choice). In this case, the chars are appended in dst buffer.
166 * - CMDLINE_PARSE_COMPLETE_AGAIN if there is several possible
167 * choices. In this case, you must call the function again,
168 * keeping the value of state intact.
169 * - CMDLINE_PARSE_COMPLETED_BUFFER when the iteration is
170 * finished. The dst is not valid for this last call.
172 * The returned dst buf ends with \0.
174 int cmdline_complete(struct cmdline *cl, const char *buf, int *state,
175 char *dst, unsigned int size);
178 /* return true if(!c || iscomment(c) || isblank(c) ||
180 int cmdline_isendoftoken(char c);
186 #endif /* _CMDLINE_PARSE_H_ */