lib/librte_cmdline/cmdline_parse_string.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2014 Intel Corporation.
   3  * Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
   4  * All rights reserved.
   5  */
   6
   7 #include <stdio.h>
   8 #include <inttypes.h>
   9 #include <ctype.h>
  10 #include <string.h>
  11 #include <stdarg.h>
  12 #include <errno.h>
  13 #include <rte_string_fns.h>
  14
  15 #include "cmdline_parse.h"
  16 #include "cmdline_parse_string.h"
  17
  18 struct cmdline_token_ops cmdline_token_string_ops = {
  19         .parse = cmdline_parse_string,
  20         .complete_get_nb = cmdline_complete_get_nb_string,
  21         .complete_get_elt = cmdline_complete_get_elt_string,
  22         .get_help = cmdline_get_help_string,
  23 };
  24
  25 #define CHOICESTRING_HELP "Mul-choice STRING"
  26 #define ANYSTRING_HELP    "Any STRING"
  27 #define ANYSTRINGS_HELP   "Any STRINGS"
  28 #define FIXEDSTRING_HELP  "Fixed STRING"
  29
  30 static unsigned int
  31 get_token_len(const char *s)
  32 {
  33         char c;
  34         unsigned int i=0;
  35
  36         c = s[i];
  37         while (c!='#' && c!='\0') {
  38                 i++;
  39                 c = s[i];
  40         }
  41         return i;
  42 }
  43
  44 static const char *
  45 get_next_token(const char *s)
  46 {
  47         unsigned int i;
  48         i = get_token_len(s);
  49         if (s[i] == '#')
  50                 return s+i+1;
  51         return NULL;
  52 }
  53
  54 int
  55 cmdline_parse_string(cmdline_parse_token_hdr_t *tk, const char *buf, void *res,
  56         unsigned ressize)
  57 {
  58         struct cmdline_token_string *tk2;
  59         struct cmdline_token_string_data *sd;
  60         unsigned int token_len;
  61         const char *str;
  62
  63         if (res && ressize < STR_TOKEN_SIZE)
  64                 return -1;
  65
  66         if (!tk || !buf || ! *buf)
  67                 return -1;
  68
  69         tk2 = (struct cmdline_token_string *)tk;
  70
  71         sd = &tk2->string_data;
  72
  73         /* fixed string (known single token) */
  74         if ((sd->str != NULL) && (strcmp(sd->str, TOKEN_STRING_MULTI) != 0)) {
  75                 str = sd->str;
  76                 do {
  77                         token_len = get_token_len(str);
  78
  79                         /* if token is too big... */
  80                         if (token_len >= STR_TOKEN_SIZE - 1) {
  81                                 continue;
  82                         }
  83
  84                         if ( strncmp(buf, str, token_len) ) {
  85                                 continue;
  86                         }
  87
  88                         if ( !cmdline_isendoftoken(*(buf+token_len)) ) {
  89                                 continue;
  90                         }
  91
  92                         break;
  93                 } while ( (str = get_next_token(str)) != NULL );
  94
  95                 if (!str)
  96                         return -1;
  97         }
  98         /* multi string */
  99         else if (sd->str != NULL) {
 100                 if (ressize < STR_MULTI_TOKEN_SIZE)
 101                         return -1;
 102
 103                 token_len = 0;
 104                 while (!cmdline_isendofcommand(buf[token_len]) &&
 105                       token_len < (STR_MULTI_TOKEN_SIZE - 1))
 106                         token_len++;
 107
 108                 /* return if token too long */
 109                 if (token_len >= (STR_MULTI_TOKEN_SIZE - 1))
 110                         return -1;
 111         }
 112         /* unspecified string (unknown single token) */
 113         else {
 114                 token_len = 0;
 115                 while(!cmdline_isendoftoken(buf[token_len]) &&
 116                       token_len < (STR_TOKEN_SIZE-1))
 117                         token_len++;
 118
 119                 /* return if token too long */
 120                 if (token_len >= STR_TOKEN_SIZE - 1) {
 121                         return -1;
 122                 }
 123         }
 124
 125         if (res) {
 126                 if ((sd->str != NULL) && (strcmp(sd->str, TOKEN_STRING_MULTI) == 0))
 127                         /* we are sure that token_len is < STR_MULTI_TOKEN_SIZE-1 */
 128                         snprintf(res, STR_MULTI_TOKEN_SIZE, "%s", buf);
 129                 else
 130                         /* we are sure that token_len is < STR_TOKEN_SIZE-1 */
 131                         snprintf(res, STR_TOKEN_SIZE, "%s", buf);
 132
 133                 *((char *)res + token_len) = 0;
 134         }
 135
 136         return token_len;
 137 }
 138
 139 int cmdline_complete_get_nb_string(cmdline_parse_token_hdr_t *tk)
 140 {
 141         struct cmdline_token_string *tk2;
 142         struct cmdline_token_string_data *sd;
 143         const char *str;
 144         int ret = 1;
 145
 146         if (!tk)
 147                 return -1;
 148
 149         tk2 = (struct cmdline_token_string *)tk;
 150         sd = &tk2->string_data;
 151
 152         if (!sd->str)
 153                 return 0;
 154
 155         str = sd->str;
 156         while( (str = get_next_token(str)) != NULL ) {
 157                 ret++;
 158         }
 159         return ret;
 160 }
 161
 162 int cmdline_complete_get_elt_string(cmdline_parse_token_hdr_t *tk, int idx,
 163                                     char *dstbuf, unsigned int size)
 164 {
 165         struct cmdline_token_string *tk2;
 166         struct cmdline_token_string_data *sd;
 167         const char *s;
 168         unsigned int len;
 169
 170         if (!tk || !dstbuf || idx < 0)
 171                 return -1;
 172
 173         tk2 = (struct cmdline_token_string *)tk;
 174         sd = &tk2->string_data;
 175
 176         s = sd->str;
 177
 178         while (idx-- && s)
 179                 s = get_next_token(s);
 180
 181         if (!s)
 182                 return -1;
 183
 184         len = get_token_len(s);
 185         if (len > size - 1)
 186                 return -1;
 187
 188         memcpy(dstbuf, s, len);
 189         dstbuf[len] = '\0';
 190         return 0;
 191 }
 192
 193
 194 int cmdline_get_help_string(cmdline_parse_token_hdr_t *tk, char *dstbuf,
 195                             unsigned int size)
 196 {
 197         struct cmdline_token_string *tk2;
 198         struct cmdline_token_string_data *sd;
 199         const char *s;
 200
 201         if (!tk || !dstbuf)
 202                 return -1;
 203
 204         tk2 = (struct cmdline_token_string *)tk;
 205         sd = &tk2->string_data;
 206
 207         s = sd->str;
 208
 209         if (s) {
 210                 if (strcmp(s, TOKEN_STRING_MULTI) == 0)
 211                         snprintf(dstbuf, size, ANYSTRINGS_HELP);
 212                 else if (get_next_token(s))
 213                         snprintf(dstbuf, size, CHOICESTRING_HELP);
 214                 else
 215                         snprintf(dstbuf, size, FIXEDSTRING_HELP);
 216         } else
 217                 snprintf(dstbuf, size, ANYSTRING_HELP);
 218
 219         return 0;
 220 }