ceph/src/seastar/dpdk/lib/librte_cmdline/cmdline_parse.h

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
  36  * All rights reserved.
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions are met:
  39  *
  40  *     * Redistributions of source code must retain the above copyright
  41  *       notice, this list of conditions and the following disclaimer.
  42  *     * Redistributions in binary form must reproduce the above copyright
  43  *       notice, this list of conditions and the following disclaimer in the
  44  *       documentation and/or other materials provided with the distribution.
  45  *     * Neither the name of the University of California, Berkeley nor the
  46  *       names of its contributors may be used to endorse or promote products
  47  *       derived from this software without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
  50  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  51  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  52  * DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
  53  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  54  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  55  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  56  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  57  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  58  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  59  */
  60
  61 #ifndef _CMDLINE_PARSE_H_
  62 #define _CMDLINE_PARSE_H_
  63
  64 #ifdef __cplusplus
  65 extern "C" {
  66 #endif
  67
  68 #ifndef offsetof
  69 #define offsetof(type, field)  ((size_t) &( ((type *)0)->field) )
  70 #endif
  71
  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
  77
  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
  82
  83 /* maximum buffer size for parsed result */
  84 #define CMDLINE_PARSE_RESULT_BUFSIZE 8192
  85
  86 /* maximum number of dynamic tokens */
  87 #define CMDLINE_PARSE_DYNAMIC_TOKENS 128
  88
  89 /**
  90  * Stores a pointer to the ops struct, and the offset: the place to
  91  * write the parsed result in the destination structure.
  92  */
  93 struct cmdline_token_hdr {
  94         struct cmdline_token_ops *ops;
  95         unsigned int offset;
  96 };
  97 typedef struct cmdline_token_hdr cmdline_parse_token_hdr_t;
  98
  99 /**
 100  * A token is defined by this structure.
 101  *
 102  * parse() takes the token as first argument, then the source buffer
 103  * starting at the token we want to parse. The 3rd arg is a pointer
 104  * where we store the parsed data (as binary). It returns the number of
 105  * parsed chars on success and a negative value on error.
 106  *
 107  * complete_get_nb() returns the number of possible values for this
 108  * token if completion is possible. If it is NULL or if it returns 0,
 109  * no completion is possible.
 110  *
 111  * complete_get_elt() copy in dstbuf (the size is specified in the
 112  * parameter) the i-th possible completion for this token.  returns 0
 113  * on success or and a negative value on error.
 114  *
 115  * get_help() fills the dstbuf with the help for the token. It returns
 116  * -1 on error and 0 on success.
 117  */
 118 struct cmdline_token_ops {
 119         /** parse(token ptr, buf, res pts, buf len) */
 120         int (*parse)(cmdline_parse_token_hdr_t *, const char *, void *,
 121                 unsigned int);
 122         /** return the num of possible choices for this token */
 123         int (*complete_get_nb)(cmdline_parse_token_hdr_t *);
 124         /** return the elt x for this token (token, idx, dstbuf, size) */
 125         int (*complete_get_elt)(cmdline_parse_token_hdr_t *, int, char *,
 126                 unsigned int);
 127         /** get help for this token (token, dstbuf, size) */
 128         int (*get_help)(cmdline_parse_token_hdr_t *, char *, unsigned int);
 129 };
 130
 131 struct cmdline;
 132 /**
 133  * Store a instruction, which is a pointer to a callback function and
 134  * its parameter that is called when the instruction is parsed, a help
 135  * string, and a list of token composing this instruction.
 136  *
 137  * When no tokens are defined (tokens[0] == NULL), they are retrieved
 138  * dynamically by calling f() as follows:
 139  *
 140  *  f((struct cmdline_token_hdr **)&token_hdr,
 141  *    NULL,
 142  *    (struct cmdline_token_hdr *[])tokens));
 143  *
 144  * The address of the resulting token is expected at the location pointed by
 145  * the first argument. Can be set to NULL to end the list.
 146  *
 147  * The cmdline argument (struct cmdline *) is always NULL.
 148  *
 149  * The last argument points to the NULL-terminated list of dynamic tokens
 150  * defined so far. Since token_hdr points to an index of that list, the
 151  * current index can be derived as follows:
 152  *
 153  *  int index = token_hdr - &(*tokens)[0];
 154  */
 155 struct cmdline_inst {
 156         /* f(parsed_struct, data) */
 157         void (*f)(void *, struct cmdline *, void *);
 158         void *data;
 159         const char *help_str;
 160         cmdline_parse_token_hdr_t *tokens[];
 161 };
 162 typedef struct cmdline_inst cmdline_parse_inst_t;
 163
 164 /**
 165  * A context is identified by its name, and contains a list of
 166  * instruction
 167  *
 168  */
 169 typedef cmdline_parse_inst_t *cmdline_parse_ctx_t;
 170
 171 /**
 172  * Try to parse a buffer according to the specified context. The
 173  * argument buf must ends with "\n\0". The function returns
 174  * CMDLINE_PARSE_AMBIGUOUS, CMDLINE_PARSE_NOMATCH or
 175  * CMDLINE_PARSE_BAD_ARGS on error. Else it calls the associated
 176  * function (defined in the context) and returns 0
 177  * (CMDLINE_PARSE_SUCCESS).
 178  */
 179 int cmdline_parse(struct cmdline *cl, const char *buf);
 180
 181 /**
 182  * complete() must be called with *state==0 (try to complete) or
 183  * with *state==-1 (just display choices), then called without
 184  * modifying *state until it returns CMDLINE_PARSE_COMPLETED_BUFFER or
 185  * CMDLINE_PARSE_COMPLETED_BUFFER.
 186  *
 187  * It returns < 0 on error.
 188  *
 189  * Else it returns:
 190  *   - CMDLINE_PARSE_COMPLETED_BUFFER on completion (one possible
 191  *     choice). In this case, the chars are appended in dst buffer.
 192  *   - CMDLINE_PARSE_COMPLETE_AGAIN if there is several possible
 193  *     choices. In this case, you must call the function again,
 194  *     keeping the value of state intact.
 195  *   - CMDLINE_PARSE_COMPLETED_BUFFER when the iteration is
 196  *     finished. The dst is not valid for this last call.
 197  *
 198  * The returned dst buf ends with \0.
 199  */
 200 int cmdline_complete(struct cmdline *cl, const char *buf, int *state,
 201                      char *dst, unsigned int size);
 202
 203
 204 /* return true if(!c || iscomment(c) || isblank(c) ||
 205  * isendofline(c)) */
 206 int cmdline_isendoftoken(char c);
 207
 208 /* return true if(!c || iscomment(c) || isendofline(c)) */
 209 int cmdline_isendofcommand(char c);
 210
 211 #ifdef __cplusplus
 212 }
 213 #endif
 214
 215 #endif /* _CMDLINE_PARSE_H_ */