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 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
  29
  30 static inline void __attribute__((noreturn)) die(const char *str, ...)
  31 {
  32         va_list ap;
  33
  34         va_start(ap, str);
  35         fprintf(stderr, "FATAL ERROR: ");
  36         vfprintf(stderr, str, ap);
  37         va_end(ap);
  38         exit(1);
  39 }
  40
  41 static inline void *xmalloc(size_t len)
  42 {
  43         void *new = malloc(len);
  44
  45         if (!new)
  46                 die("malloc() failed\n");
  47
  48         return new;
  49 }
  50
  51 static inline void *xrealloc(void *p, size_t len)
  52 {
  53         void *new = realloc(p, len);
  54
  55         if (!new)
  56                 die("realloc() failed (len=%d)\n", len);
  57
  58         return new;
  59 }
  60
  61 extern char *xstrdup(const char *s);
  62 extern char *join_path(const char *path, const char *name);
  63
  64 /**
  65  * Check a property of a given length to see if it is all printable and
  66  * has a valid terminator. The property can contain either a single string,
  67  * or multiple strings each of non-zero length.
  68  *
  69  * @param data  The string to check
  70  * @param len   The string length including terminator
  71  * @return 1 if a valid printable string, 0 if not
  72  */
  73 bool util_is_printable_string(const void *data, int len);
  74
  75 /*
  76  * Parse an escaped character starting at index i in string s.  The resulting
  77  * character will be returned and the index i will be updated to point at the
  78  * character directly after the end of the encoding, this may be the '\0'
  79  * terminator of the string.
  80  */
  81 char get_escape_char(const char *s, int *i);
  82
  83 /**
  84  * Read a device tree file into a buffer. This will report any errors on
  85  * stderr.
  86  *
  87  * @param filename      The filename to read, or - for stdin
  88  * @return Pointer to allocated buffer containing fdt, or NULL on error
  89  */
  90 char *utilfdt_read(const char *filename);
  91
  92 /**
  93  * Like utilfdt_read(), but also passes back the size of the file read.
  94  *
  95  * @param len           If non-NULL, the amount of data we managed to read
  96  */
  97 char *utilfdt_read_len(const char *filename, off_t *len);
  98
  99 /**
 100  * Read a device tree file into a buffer. Does not report errors, but only
 101  * returns them. The value returned can be passed to strerror() to obtain
 102  * an error message for the user.
 103  *
 104  * @param filename      The filename to read, or - for stdin
 105  * @param buffp         Returns pointer to buffer containing fdt
 106  * @return 0 if ok, else an errno value representing the error
 107  */
 108 int utilfdt_read_err(const char *filename, char **buffp);
 109
 110 /**
 111  * Like utilfdt_read_err(), but also passes back the size of the file read.
 112  *
 113  * @param len           If non-NULL, the amount of data we managed to read
 114  */
 115 int utilfdt_read_err_len(const char *filename, char **buffp, off_t *len);
 116
 117 /**
 118  * Write a device tree buffer to a file. This will report any errors on
 119  * stderr.
 120  *
 121  * @param filename      The filename to write, or - for stdout
 122  * @param blob          Poiner to buffer containing fdt
 123  * @return 0 if ok, -1 on error
 124  */
 125 int utilfdt_write(const char *filename, const void *blob);
 126
 127 /**
 128  * Write a device tree buffer to a file. Does not report errors, but only
 129  * returns them. The value returned can be passed to strerror() to obtain
 130  * an error message for the user.
 131  *
 132  * @param filename      The filename to write, or - for stdout
 133  * @param blob          Poiner to buffer containing fdt
 134  * @return 0 if ok, else an errno value representing the error
 135  */
 136 int utilfdt_write_err(const char *filename, const void *blob);
 137
 138 /**
 139  * Decode a data type string. The purpose of this string
 140  *
 141  * The string consists of an optional character followed by the type:
 142  *      Modifier characters:
 143  *              hh or b 1 byte
 144  *              h       2 byte
 145  *              l       4 byte, default
 146  *
 147  *      Type character:
 148  *              s       string
 149  *              i       signed integer
 150  *              u       unsigned integer
 151  *              x       hex
 152  *
 153  * TODO: Implement ll modifier (8 bytes)
 154  * TODO: Implement o type (octal)
 155  *
 156  * @param fmt           Format string to process
 157  * @param type          Returns type found(s/d/u/x), or 0 if none
 158  * @param size          Returns size found(1,2,4,8) or 4 if none
 159  * @return 0 if ok, -1 on error (no type given, or other invalid format)
 160  */
 161 int utilfdt_decode_type(const char *fmt, int *type, int *size);
 162
 163 /*
 164  * This is a usage message fragment for the -t option. It is the format
 165  * supported by utilfdt_decode_type.
 166  */
 167
 168 #define USAGE_TYPE_MSG \
 169         "<type>\ts=string, i=int, u=unsigned, x=hex\n" \
 170         "\tOptional modifier prefix:\n" \
 171         "\t\thh or b=byte, h=2 byte, l=4 byte (default)";
 172
 173 /**
 174  * Print property data in a readable format to stdout
 175  *
 176  * Properties that look like strings will be printed as strings. Otherwise
 177  * the data will be displayed either as cells (if len is a multiple of 4
 178  * bytes) or bytes.
 179  *
 180  * If len is 0 then this function does nothing.
 181  *
 182  * @param data  Pointers to property data
 183  * @param len   Length of property data
 184  */
 185 void utilfdt_print_data(const char *data, int len);
 186
 187 /**
 188  * Show source version and exit
 189  */
 190 void util_version(void) __attribute__((noreturn));
 191
 192 /**
 193  * Show usage and exit
 194  *
 195  * This helps standardize the output of various utils.  You most likely want
 196  * to use the usage() helper below rather than call this.
 197  *
 198  * @param errmsg        If non-NULL, an error message to display
 199  * @param synopsis      The initial example usage text (and possible examples)
 200  * @param short_opts    The string of short options
 201  * @param long_opts     The structure of long options
 202  * @param opts_help     An array of help strings (should align with long_opts)
 203  */
 204 void util_usage(const char *errmsg, const char *synopsis,
 205                 const char *short_opts, struct option const long_opts[],
 206                 const char * const opts_help[]) __attribute__((noreturn));
 207
 208 /**
 209  * Show usage and exit
 210  *
 211  * If you name all your usage variables with usage_xxx, then you can call this
 212  * help macro rather than expanding all arguments yourself.
 213  *
 214  * @param errmsg        If non-NULL, an error message to display
 215  */
 216 #define usage(errmsg) \
 217         util_usage(errmsg, usage_synopsis, usage_short_opts, \
 218                    usage_long_opts, usage_opts_help)
 219
 220 /**
 221  * Call getopt_long() with standard options
 222  *
 223  * Since all util code runs getopt in the same way, provide a helper.
 224  */
 225 #define util_getopt_long() getopt_long(argc, argv, usage_short_opts, \
 226                                        usage_long_opts, NULL)
 227
 228 /* Helper for aligning long_opts array */
 229 #define a_argument required_argument
 230
 231 /* Helper for usage_short_opts string constant */
 232 #define USAGE_COMMON_SHORT_OPTS "hV"
 233
 234 /* Helper for usage_long_opts option array */
 235 #define USAGE_COMMON_LONG_OPTS \
 236         {"help",      no_argument, NULL, 'h'}, \
 237         {"version",   no_argument, NULL, 'V'}, \
 238         {NULL,        no_argument, NULL, 0x0}
 239
 240 /* Helper for usage_opts_help array */
 241 #define USAGE_COMMON_OPTS_HELP \
 242         "Print this help and exit", \
 243         "Print version and exit", \
 244         NULL
 245
 246 /* Helper for getopt case statements */
 247 #define case_USAGE_COMMON_FLAGS \
 248         case 'h': usage(NULL); \
 249         case 'V': util_version(); \
 250         case '?': usage("unknown option");
 251
 252 #endif /* _UTIL_H */