scripts/dtc/util.h

   1 #ifndef _UTIL_H
   2 #define _UTIL_H
   3
   4 #include <stdarg.h>
   5 #include <stdbool.h>
   6 #include <getopt.h>
   7
   8 /*
   9  * Copyright 2011 The Chromium Authors, All Rights Reserved.
  10  * Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  *  This program is distributed in the hope that it will be useful,
  18  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  *  General Public License for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License
  23  *  along with this program; if not, write to the Free Software
  24  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  25  *                                                                   USA
  26  */
  27
  28 #ifdef __GNUC__
  29 #define PRINTF(i, j)    __attribute__((format (printf, i, j)))
  30 #define NORETURN        __attribute__((noreturn))
  31 #else
  32 #define PRINTF(i, j)
  33 #define NORETURN
  34 #endif
  35
  36 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  37
  38 static inline void NORETURN PRINTF(1, 2) die(const char *str, ...)
  39 {
  40         va_list ap;
  41
  42         va_start(ap, str);
  43         fprintf(stderr, "FATAL ERROR: ");
  44         vfprintf(stderr, str, ap);
  45         va_end(ap);
  46         exit(1);
  47 }
  48
  49 static inline void *xmalloc(size_t len)
  50 {
  51         void *new = malloc(len);
  52
  53         if (!new)
  54                 die("malloc() failed\n");
  55
  56         return new;
  57 }
  58
  59 static inline void *xrealloc(void *p, size_t len)
  60 {
  61         void *new = realloc(p, len);
  62
  63         if (!new)
  64                 die("realloc() failed (len=%zd)\n", len);
  65
  66         return new;
  67 }
  68
  69 extern char *xstrdup(const char *s);
  70
  71 extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...);
  72 extern char *join_path(const char *path, const char *name);
  73
  74 /**
  75  * Check a property of a given length to see if it is all printable and
  76  * has a valid terminator. The property can contain either a single string,
  77  * or multiple strings each of non-zero length.
  78  *
  79  * @param data  The string to check
  80  * @param len   The string length including terminator
  81  * @return 1 if a valid printable string, 0 if not
  82  */
  83 bool util_is_printable_string(const void *data, int len);
  84
  85 /*
  86  * Parse an escaped character starting at index i in string s.  The resulting
  87  * character will be returned and the index i will be updated to point at the
  88  * character directly after the end of the encoding, this may be the '\0'
  89  * terminator of the string.
  90  */
  91 char get_escape_char(const char *s, int *i);
  92
  93 /**
  94  * Read a device tree file into a buffer. This will report any errors on
  95  * stderr.
  96  *
  97  * @param filename      The filename to read, or - for stdin
  98  * @return Pointer to allocated buffer containing fdt, or NULL on error
  99  */
 100 char *utilfdt_read(const char *filename);
 101
 102 /**
 103  * Like utilfdt_read(), but also passes back the size of the file read.
 104  *
 105  * @param len           If non-NULL, the amount of data we managed to read
 106  */
 107 char *utilfdt_read_len(const char *filename, off_t *len);
 108
 109 /**
 110  * Read a device tree file into a buffer. Does not report errors, but only
 111  * returns them. The value returned can be passed to strerror() to obtain
 112  * an error message for the user.
 113  *
 114  * @param filename      The filename to read, or - for stdin
 115  * @param buffp         Returns pointer to buffer containing fdt
 116  * @return 0 if ok, else an errno value representing the error
 117  */
 118 int utilfdt_read_err(const char *filename, char **buffp);
 119
 120 /**
 121  * Like utilfdt_read_err(), but also passes back the size of the file read.
 122  *
 123  * @param len           If non-NULL, the amount of data we managed to read
 124  */
 125 int utilfdt_read_err_len(const char *filename, char **buffp, off_t *len);
 126
 127 /**
 128  * Write a device tree buffer to a file. This will report any errors on
 129  * stderr.
 130  *
 131  * @param filename      The filename to write, or - for stdout
 132  * @param blob          Poiner to buffer containing fdt
 133  * @return 0 if ok, -1 on error
 134  */
 135 int utilfdt_write(const char *filename, const void *blob);
 136
 137 /**
 138  * Write a device tree buffer to a file. Does not report errors, but only
 139  * returns them. The value returned can be passed to strerror() to obtain
 140  * an error message for the user.
 141  *
 142  * @param filename      The filename to write, or - for stdout
 143  * @param blob          Poiner to buffer containing fdt
 144  * @return 0 if ok, else an errno value representing the error
 145  */
 146 int utilfdt_write_err(const char *filename, const void *blob);
 147
 148 /**
 149  * Decode a data type string. The purpose of this string
 150  *
 151  * The string consists of an optional character followed by the type:
 152  *      Modifier characters:
 153  *              hh or b 1 byte
 154  *              h       2 byte
 155  *              l       4 byte, default
 156  *
 157  *      Type character:
 158  *              s       string
 159  *              i       signed integer
 160  *              u       unsigned integer
 161  *              x       hex
 162  *
 163  * TODO: Implement ll modifier (8 bytes)
 164  * TODO: Implement o type (octal)
 165  *
 166  * @param fmt           Format string to process
 167  * @param type          Returns type found(s/d/u/x), or 0 if none
 168  * @param size          Returns size found(1,2,4,8) or 4 if none
 169  * @return 0 if ok, -1 on error (no type given, or other invalid format)
 170  */
 171 int utilfdt_decode_type(const char *fmt, int *type, int *size);
 172
 173 /*
 174  * This is a usage message fragment for the -t option. It is the format
 175  * supported by utilfdt_decode_type.
 176  */
 177
 178 #define USAGE_TYPE_MSG \
 179         "<type>\ts=string, i=int, u=unsigned, x=hex\n" \
 180         "\tOptional modifier prefix:\n" \
 181         "\t\thh or b=byte, h=2 byte, l=4 byte (default)";
 182
 183 /**
 184  * Print property data in a readable format to stdout
 185  *
 186  * Properties that look like strings will be printed as strings. Otherwise
 187  * the data will be displayed either as cells (if len is a multiple of 4
 188  * bytes) or bytes.
 189  *
 190  * If len is 0 then this function does nothing.
 191  *
 192  * @param data  Pointers to property data
 193  * @param len   Length of property data
 194  */
 195 void utilfdt_print_data(const char *data, int len);
 196
 197 /**
 198  * Show source version and exit
 199  */
 200 void NORETURN util_version(void);
 201
 202 /**
 203  * Show usage and exit
 204  *
 205  * This helps standardize the output of various utils.  You most likely want
 206  * to use the usage() helper below rather than call this.
 207  *
 208  * @param errmsg        If non-NULL, an error message to display
 209  * @param synopsis      The initial example usage text (and possible examples)
 210  * @param short_opts    The string of short options
 211  * @param long_opts     The structure of long options
 212  * @param opts_help     An array of help strings (should align with long_opts)
 213  */
 214 void NORETURN util_usage(const char *errmsg, const char *synopsis,
 215                          const char *short_opts,
 216                          struct option const long_opts[],
 217                          const char * const opts_help[]);
 218
 219 /**
 220  * Show usage and exit
 221  *
 222  * If you name all your usage variables with usage_xxx, then you can call this
 223  * help macro rather than expanding all arguments yourself.
 224  *
 225  * @param errmsg        If non-NULL, an error message to display
 226  */
 227 #define usage(errmsg) \
 228         util_usage(errmsg, usage_synopsis, usage_short_opts, \
 229                    usage_long_opts, usage_opts_help)
 230
 231 /**
 232  * Call getopt_long() with standard options
 233  *
 234  * Since all util code runs getopt in the same way, provide a helper.
 235  */
 236 #define util_getopt_long() getopt_long(argc, argv, usage_short_opts, \
 237                                        usage_long_opts, NULL)
 238
 239 /* Helper for aligning long_opts array */
 240 #define a_argument required_argument
 241
 242 /* Helper for usage_short_opts string constant */
 243 #define USAGE_COMMON_SHORT_OPTS "hV"
 244
 245 /* Helper for usage_long_opts option array */
 246 #define USAGE_COMMON_LONG_OPTS \
 247         {"help",      no_argument, NULL, 'h'}, \
 248         {"version",   no_argument, NULL, 'V'}, \
 249         {NULL,        no_argument, NULL, 0x0}
 250
 251 /* Helper for usage_opts_help array */
 252 #define USAGE_COMMON_OPTS_HELP \
 253         "Print this help and exit", \
 254         "Print version and exit", \
 255         NULL
 256
 257 /* Helper for getopt case statements */
 258 #define case_USAGE_COMMON_FLAGS \
 259         case 'h': usage(NULL); \
 260         case 'V': util_version(); \
 261         case '?': usage("unknown option");
 262
 263 #endif /* _UTIL_H */