cmd/ini.c

   1 // SPDX-License-Identifier: BSD-3-Clause
   2 /*
   3  * inih -- simple .INI file parser
   4  *
   5  * Copyright (c) 2009, Brush Technology
   6  * Copyright (c) 2012:
   7  *              Joe Hershberger, National Instruments, joe.hershberger@ni.com
   8  * All rights reserved.
   9  *
  10  * Go to the project home page for more info:
  11  * http://code.google.com/p/inih/
  12  */
  13
  14 #include <command.h>
  15 #include <env.h>
  16 #include <vsprintf.h>
  17 #include <linux/ctype.h>
  18 #include <linux/string.h>
  19
  20 #ifdef CONFIG_INI_MAX_LINE
  21 #define MAX_LINE CONFIG_INI_MAX_LINE
  22 #else
  23 #define MAX_LINE 200
  24 #endif
  25
  26 #ifdef CONFIG_INI_MAX_SECTION
  27 #define MAX_SECTION CONFIG_INI_MAX_SECTION
  28 #else
  29 #define MAX_SECTION 50
  30 #endif
  31
  32 #ifdef CONFIG_INI_MAX_NAME
  33 #define MAX_NAME CONFIG_INI_MAX_NAME
  34 #else
  35 #define MAX_NAME 50
  36 #endif
  37
  38 /* Strip whitespace chars off end of given string, in place. Return s. */
  39 static char *rstrip(char *s)
  40 {
  41         char *p = s + strlen(s);
  42
  43         while (p > s && isspace(*--p))
  44                 *p = '\0';
  45         return s;
  46 }
  47
  48 /* Return pointer to first non-whitespace char in given string. */
  49 static char *lskip(const char *s)
  50 {
  51         while (*s && isspace(*s))
  52                 s++;
  53         return (char *)s;
  54 }
  55
  56 /* Return pointer to first char c or ';' comment in given string, or pointer to
  57    null at end of string if neither found. ';' must be prefixed by a whitespace
  58    character to register as a comment. */
  59 static char *find_char_or_comment(const char *s, char c)
  60 {
  61         int was_whitespace = 0;
  62
  63         while (*s && *s != c && !(was_whitespace && *s == ';')) {
  64                 was_whitespace = isspace(*s);
  65                 s++;
  66         }
  67         return (char *)s;
  68 }
  69
  70 /* Version of strncpy that ensures dest (size bytes) is null-terminated. */
  71 static char *strncpy0(char *dest, const char *src, size_t size)
  72 {
  73         strncpy(dest, src, size);
  74         dest[size - 1] = '\0';
  75         return dest;
  76 }
  77
  78 /* Emulate the behavior of fgets but on memory */
  79 static char *memgets(char *str, int num, char **mem, size_t *memsize)
  80 {
  81         char *end;
  82         int len;
  83         int newline = 1;
  84
  85         end = memchr(*mem, '\n', *memsize);
  86         if (end == NULL) {
  87                 if (*memsize == 0)
  88                         return NULL;
  89                 end = *mem + *memsize;
  90                 newline = 0;
  91         }
  92         len = min((int)(end - *mem) + newline, num);
  93         memcpy(str, *mem, len);
  94         if (len < num)
  95                 str[len] = '\0';
  96
  97         /* prepare the mem vars for the next call */
  98         *memsize -= (end - *mem) + newline;
  99         *mem += (end - *mem) + newline;
 100
 101         return str;
 102 }
 103
 104 /* Parse given INI-style file. May have [section]s, name=value pairs
 105    (whitespace stripped), and comments starting with ';' (semicolon). Section
 106    is "" if name=value pair parsed before any section heading. name:value
 107    pairs are also supported as a concession to Python's ConfigParser.
 108
 109    For each name=value pair parsed, call handler function with given user
 110    pointer as well as section, name, and value (data only valid for duration
 111    of handler call). Handler should return nonzero on success, zero on error.
 112
 113    Returns 0 on success, line number of first error on parse error (doesn't
 114    stop on first error).
 115 */
 116 static int ini_parse(char *filestart, size_t filelen,
 117         int (*handler)(void *, char *, char *, char *), void *user)
 118 {
 119         /* Uses a fair bit of stack (use heap instead if you need to) */
 120         char line[MAX_LINE];
 121         char section[MAX_SECTION] = "";
 122         char prev_name[MAX_NAME] = "";
 123
 124         char *curmem = filestart;
 125         char *start;
 126         char *end;
 127         char *name;
 128         char *value;
 129         size_t memleft = filelen;
 130         int lineno = 0;
 131         int error = 0;
 132
 133         /* Scan through file line by line */
 134         while (memgets(line, sizeof(line), &curmem, &memleft) != NULL) {
 135                 lineno++;
 136                 start = lskip(rstrip(line));
 137
 138                 if (*start == ';' || *start == '#') {
 139                         /*
 140                          * Per Python ConfigParser, allow '#' comments at start
 141                          * of line
 142                          */
 143                 }
 144 #if CONFIG_INI_ALLOW_MULTILINE
 145                 else if (*prev_name && *start && start > line) {
 146                         /*
 147                          * Non-blank line with leading whitespace, treat as
 148                          * continuation of previous name's value (as per Python
 149                          * ConfigParser).
 150                          */
 151                         if (!handler(user, section, prev_name, start) && !error)
 152                                 error = lineno;
 153                 }
 154 #endif
 155                 else if (*start == '[') {
 156                         /* A "[section]" line */
 157                         end = find_char_or_comment(start + 1, ']');
 158                         if (*end == ']') {
 159                                 *end = '\0';
 160                                 strncpy0(section, start + 1, sizeof(section));
 161                                 *prev_name = '\0';
 162                         } else if (!error) {
 163                                 /* No ']' found on section line */
 164                                 error = lineno;
 165                         }
 166                 } else if (*start && *start != ';') {
 167                         /* Not a comment, must be a name[=:]value pair */
 168                         end = find_char_or_comment(start, '=');
 169                         if (*end != '=')
 170                                 end = find_char_or_comment(start, ':');
 171                         if (*end == '=' || *end == ':') {
 172                                 *end = '\0';
 173                                 name = rstrip(start);
 174                                 value = lskip(end + 1);
 175                                 end = find_char_or_comment(value, '\0');
 176                                 if (*end == ';')
 177                                         *end = '\0';
 178                                 rstrip(value);
 179                                 /* Strip double-quotes */
 180                                 if (value[0] == '"' &&
 181                                     value[strlen(value)-1] == '"') {
 182                                         value[strlen(value)-1] = '\0';
 183                                         value += 1;
 184                                 }
 185
 186                                 /*
 187                                  * Valid name[=:]value pair found, call handler
 188                                  */
 189                                 strncpy0(prev_name, name, sizeof(prev_name));
 190                                 if (!handler(user, section, name, value) &&
 191                                      !error)
 192                                         error = lineno;
 193                         } else if (!error)
 194                                 /* No '=' or ':' found on name[=:]value line */
 195                                 error = lineno;
 196                 }
 197         }
 198
 199         return error;
 200 }
 201
 202 static int ini_handler(void *user, char *section, char *name, char *value)
 203 {
 204         char *requested_section = (char *)user;
 205 #ifdef CONFIG_INI_CASE_INSENSITIVE
 206         int i;
 207
 208         for (i = 0; i < strlen(requested_section); i++)
 209                 requested_section[i] = tolower(requested_section[i]);
 210         for (i = 0; i < strlen(section); i++)
 211                 section[i] = tolower(section[i]);
 212 #endif
 213
 214         if (!strcmp(section, requested_section)) {
 215 #ifdef CONFIG_INI_CASE_INSENSITIVE
 216                 for (i = 0; i < strlen(name); i++)
 217                         name[i] = tolower(name[i]);
 218                 for (i = 0; i < strlen(value); i++)
 219                         value[i] = tolower(value[i]);
 220 #endif
 221                 env_set(name, value);
 222                 printf("ini: Imported %s as %s\n", name, value);
 223         }
 224
 225         /* success */
 226         return 1;
 227 }
 228
 229 static int do_ini(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 230 {
 231         const char *section;
 232         char *file_address;
 233         size_t file_size;
 234
 235         if (argc == 1)
 236                 return CMD_RET_USAGE;
 237
 238         section = argv[1];
 239         file_address = (char *)hextoul(argc < 3 ? env_get("loadaddr") : argv[2],
 240                                         NULL);
 241         file_size = (size_t)hextoul(argc < 4 ? env_get("filesize") : argv[3],
 242                                      NULL);
 243
 244         return ini_parse(file_address, file_size, ini_handler, (void *)section);
 245 }
 246
 247 U_BOOT_CMD(
 248         ini, 4, 0, do_ini,
 249         "parse an ini file in memory and merge the specified section into the env",
 250         "section [[file-address] file-size]"
 251 );