linux/scripts/dtc/util.h
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   1#ifndef _UTIL_H
   2#define _UTIL_H
   3
   4#include <stdarg.h>
   5
   6/*
   7 * Copyright 2011 The Chromium Authors, All Rights Reserved.
   8 * Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License as
  12 * published by the Free Software Foundation; either version 2 of the
  13 * License, or (at your option) any later version.
  14 *
  15 *  This program is distributed in the hope that it will be useful,
  16 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18 *  General Public License for more details.
  19 *
  20 *  You should have received a copy of the GNU General Public License
  21 *  along with this program; if not, write to the Free Software
  22 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  23 *                                                                   USA
  24 */
  25
  26static inline void __attribute__((noreturn)) die(char * str, ...)
  27{
  28        va_list ap;
  29
  30        va_start(ap, str);
  31        fprintf(stderr, "FATAL ERROR: ");
  32        vfprintf(stderr, str, ap);
  33        exit(1);
  34}
  35
  36static inline void *xmalloc(size_t len)
  37{
  38        void *new = malloc(len);
  39
  40        if (!new)
  41                die("malloc() failed\n");
  42
  43        return new;
  44}
  45
  46static inline void *xrealloc(void *p, size_t len)
  47{
  48        void *new = realloc(p, len);
  49
  50        if (!new)
  51                die("realloc() failed (len=%d)\n", len);
  52
  53        return new;
  54}
  55
  56extern char *xstrdup(const char *s);
  57extern char *join_path(const char *path, const char *name);
  58
  59/**
  60 * Check a string of a given length to see if it is all printable and
  61 * has a valid terminator.
  62 *
  63 * @param data  The string to check
  64 * @param len   The string length including terminator
  65 * @return 1 if a valid printable string, 0 if not */
  66int util_is_printable_string(const void *data, int len);
  67
  68/*
  69 * Parse an escaped character starting at index i in string s.  The resulting
  70 * character will be returned and the index i will be updated to point at the
  71 * character directly after the end of the encoding, this may be the '\0'
  72 * terminator of the string.
  73 */
  74char get_escape_char(const char *s, int *i);
  75
  76/**
  77 * Read a device tree file into a buffer. This will report any errors on
  78 * stderr.
  79 *
  80 * @param filename      The filename to read, or - for stdin
  81 * @return Pointer to allocated buffer containing fdt, or NULL on error
  82 */
  83char *utilfdt_read(const char *filename);
  84
  85/**
  86 * Read a device tree file into a buffer. Does not report errors, but only
  87 * returns them. The value returned can be passed to strerror() to obtain
  88 * an error message for the user.
  89 *
  90 * @param filename      The filename to read, or - for stdin
  91 * @param buffp         Returns pointer to buffer containing fdt
  92 * @return 0 if ok, else an errno value representing the error
  93 */
  94int utilfdt_read_err(const char *filename, char **buffp);
  95
  96
  97/**
  98 * Write a device tree buffer to a file. This will report any errors on
  99 * stderr.
 100 *
 101 * @param filename      The filename to write, or - for stdout
 102 * @param blob          Poiner to buffer containing fdt
 103 * @return 0 if ok, -1 on error
 104 */
 105int utilfdt_write(const char *filename, const void *blob);
 106
 107/**
 108 * Write a device tree buffer to a file. Does not report errors, but only
 109 * returns them. The value returned can be passed to strerror() to obtain
 110 * an error message for the user.
 111 *
 112 * @param filename      The filename to write, or - for stdout
 113 * @param blob          Poiner to buffer containing fdt
 114 * @return 0 if ok, else an errno value representing the error
 115 */
 116int utilfdt_write_err(const char *filename, const void *blob);
 117
 118/**
 119 * Decode a data type string. The purpose of this string
 120 *
 121 * The string consists of an optional character followed by the type:
 122 *      Modifier characters:
 123 *              hh or b 1 byte
 124 *              h       2 byte
 125 *              l       4 byte, default
 126 *
 127 *      Type character:
 128 *              s       string
 129 *              i       signed integer
 130 *              u       unsigned integer
 131 *              x       hex
 132 *
 133 * TODO: Implement ll modifier (8 bytes)
 134 * TODO: Implement o type (octal)
 135 *
 136 * @param fmt           Format string to process
 137 * @param type          Returns type found(s/d/u/x), or 0 if none
 138 * @param size          Returns size found(1,2,4,8) or 4 if none
 139 * @return 0 if ok, -1 on error (no type given, or other invalid format)
 140 */
 141int utilfdt_decode_type(const char *fmt, int *type, int *size);
 142
 143/*
 144 * This is a usage message fragment for the -t option. It is the format
 145 * supported by utilfdt_decode_type.
 146 */
 147
 148#define USAGE_TYPE_MSG \
 149        "<type>\ts=string, i=int, u=unsigned, x=hex\n" \
 150        "\tOptional modifier prefix:\n" \
 151        "\t\thh or b=byte, h=2 byte, l=4 byte (default)\n";
 152
 153#endif /* _UTIL_H */
 154
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