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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
76 #define CMDLINE_PARSE_UNTERMINATED_QUOTE -4
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
83 #define CMDLINE_MAX_TOKEN_SIZE 128 /* including '\0' */
84 #define CMDLINE_MAX_DSTBUF_SIZE 1024
87 * Stores a pointer to the ops struct, and the offset: the place to
88 * write the parsed result in the destination structure.
90 struct cmdline_token_hdr {
91 struct cmdline_token_ops *ops;
94 typedef struct cmdline_token_hdr cmdline_parse_token_hdr_t;
97 * A token is defined by this structure.
99 * parse() takes the token as first argument, then the source buffer
100 * starting at the token we want to parse. The 3rd arg is a pointer
101 * where we store the parsed data (as binary), and the 4th arg is the
102 * size of this area. It returns 0 on success and a negative value on
105 * complete_get_nb() returns the number of possible values for this
106 * token if completion is possible. If it is NULL or if it returns 0,
107 * no completion is possible.
109 * complete_get_elt() copy in dstbuf (the size is specified in the
110 * parameter) the i-th possible completion for this token. Return 0
111 * on success or a negative value on error.
113 * get_help() fills the dstbuf with the help for the token. It returns
114 * -1 on error and 0 on success.
116 struct cmdline_token_ops {
117 /** parse(token ptr, buf, res pts) */
118 int (*parse)(cmdline_parse_token_hdr_t *, const char *, void *,
120 /** return the num of possible choices for this token */
121 int (*complete_get_nb)(cmdline_parse_token_hdr_t *);
122 /** return the elt x for this token (token, idx, dstbuf, size) */
123 int (*complete_get_elt)(cmdline_parse_token_hdr_t *, int, char *,
125 /** get help for this token (token, dstbuf, size) */
126 int (*get_help)(cmdline_parse_token_hdr_t *, char *, unsigned int);
131 * Store a instruction, which is a pointer to a callback function and
132 * its parameter that is called when the instruction is parsed, a help
133 * string, and a list of token composing this instruction.
135 struct cmdline_inst {
136 /* f(parsed_struct, data) */
137 void (*f)(void *, struct cmdline *, void *);
140 cmdline_parse_token_hdr_t *tokens[];
142 typedef struct cmdline_inst cmdline_parse_inst_t;
145 * A context is identified by its name, and contains a list of
149 typedef cmdline_parse_inst_t *cmdline_parse_ctx_t;
152 * Try to parse a buffer according to the specified context. The
153 * argument buf must ends with "\n\0". The function returns
154 * CMDLINE_PARSE_AMBIGUOUS, CMDLINE_PARSE_NOMATCH or
155 * CMDLINE_PARSE_BAD_ARGS on error. Else it calls the associated
156 * function (defined in the context) and returns 0
157 * (CMDLINE_PARSE_SUCCESS).
159 int cmdline_parse(struct cmdline *cl, const char *buf);
162 * complete() must be called with *state==0 (try to complete) or
163 * with *state==-1 (just display choices), then called without
164 * modifying *state until it returns CMDLINE_PARSE_COMPLETED_BUFFER or
165 * CMDLINE_PARSE_COMPLETED_BUFFER.
167 * It returns < 0 on error.
170 * - CMDLINE_PARSE_COMPLETED_BUFFER on completion (one possible
171 * choice). In this case, the chars are appended in dst buffer.
172 * - CMDLINE_PARSE_COMPLETE_AGAIN if there is several possible
173 * choices. In this case, you must call the function again,
174 * keeping the value of state intact.
175 * - CMDLINE_PARSE_COMPLETED_BUFFER when the iteration is
176 * finished. The dst is not valid for this last call.
178 * The returned dst buf ends with \0.
180 int cmdline_complete(struct cmdline *cl, const char *buf, int *state,
181 char *dst, unsigned int size);
184 /* return true if(!c || iscomment(c) || isblank(c) ||
186 int cmdline_isendoftoken(char c);
188 /* quote a string and escape original quotes */
189 int cmdline_quote_token(char *dst, unsigned dstlen, const char *src);
191 /* remove quote and stop when we reach the end of token */
192 int cmdline_unquote_token(char *dst, unsigned dstlen, const char *src);
194 #endif /* _CMDLINE_PARSE_H_ */