Add fdtget utility to read property values from a device tree
This simply utility makes it easy for scripts to read values from the device
tree. It is written in C and uses the same libfdt as the rest of the dtc
package.
What is it for:
- Reading fdt values from scripts
- Extracting fdt information within build systems
- Looking at particular values without having to dump the entire tree
To use it, specify the fdt binary file on command line followed by a list of
node, property pairs. The utility then looks up each node, finds the property
and displays the value.
Each value is printed on a new line.
fdtget tries to guess the type of each property based on its contents. This
is not always reliable, so you can use the -t option to force fdtget to decode
the value as a string, or byte, etc.
To read from stdin, use - as the file.
Usage:
fdtget <options> <dt file> [<node> <property>]...
Options:
-t <type> Type of data
-h Print this help
<type> s=string, i=int, u=unsigned, x=hex
Optional modifier prefix:
hh or b=byte, h=2 byte, l=4 byte (default)
Signed-off-by: Simon Glass <sjg@chromium.org>
13 years ago
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/*
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* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <ctype.h>
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#include <getopt.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <libfdt.h>
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#include "util.h"
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/* Holds information which controls our output and options */
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struct display_info {
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int type; /* data type (s/i/u/x or 0 for default) */
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int size; /* data size (1/2/4) */
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};
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static void report_error(const char *where, int err)
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{
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fprintf(stderr, "Error at '%s': %s\n", where, fdt_strerror(err));
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}
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/**
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* Displays data of a given length according to selected options
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*
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* If a specific data type is provided in disp, then this is used. Otherwise
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* we try to guess the data type / size from the contents.
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*
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* @param disp Display information / options
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* @param data Data to display
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* @param len Maximum length of buffer
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* @return 0 if ok, -1 if data does not match format
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*/
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static int show_data(struct display_info *disp, const char *data, int len)
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{
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int i, size;
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const uint8_t *p = (const uint8_t *)data;
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const char *s;
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int value;
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int is_string;
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char fmt[3];
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/* no data, don't print */
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if (len == 0)
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return 0;
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is_string = (disp->type) == 's' ||
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(!disp->type && util_is_printable_string(data, len));
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if (is_string) {
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if (data[len - 1] != '\0') {
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fprintf(stderr, "Unterminated string\n");
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return -1;
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}
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for (s = data; s - data < len; s += strlen(s) + 1) {
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if (s != data)
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printf(" ");
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printf("%s", (const char *)s);
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}
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return 0;
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}
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size = disp->size;
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if (size == -1) {
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Add fdtget utility to read property values from a device tree
This simply utility makes it easy for scripts to read values from the device
tree. It is written in C and uses the same libfdt as the rest of the dtc
package.
What is it for:
- Reading fdt values from scripts
- Extracting fdt information within build systems
- Looking at particular values without having to dump the entire tree
To use it, specify the fdt binary file on command line followed by a list of
node, property pairs. The utility then looks up each node, finds the property
and displays the value.
Each value is printed on a new line.
fdtget tries to guess the type of each property based on its contents. This
is not always reliable, so you can use the -t option to force fdtget to decode
the value as a string, or byte, etc.
To read from stdin, use - as the file.
Usage:
fdtget <options> <dt file> [<node> <property>]...
Options:
-t <type> Type of data
-h Print this help
<type> s=string, i=int, u=unsigned, x=hex
Optional modifier prefix:
hh or b=byte, h=2 byte, l=4 byte (default)
Signed-off-by: Simon Glass <sjg@chromium.org>
13 years ago
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size = (len % 4) == 0 ? 4 : 1;
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} else if (len % size) {
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Add fdtget utility to read property values from a device tree
This simply utility makes it easy for scripts to read values from the device
tree. It is written in C and uses the same libfdt as the rest of the dtc
package.
What is it for:
- Reading fdt values from scripts
- Extracting fdt information within build systems
- Looking at particular values without having to dump the entire tree
To use it, specify the fdt binary file on command line followed by a list of
node, property pairs. The utility then looks up each node, finds the property
and displays the value.
Each value is printed on a new line.
fdtget tries to guess the type of each property based on its contents. This
is not always reliable, so you can use the -t option to force fdtget to decode
the value as a string, or byte, etc.
To read from stdin, use - as the file.
Usage:
fdtget <options> <dt file> [<node> <property>]...
Options:
-t <type> Type of data
-h Print this help
<type> s=string, i=int, u=unsigned, x=hex
Optional modifier prefix:
hh or b=byte, h=2 byte, l=4 byte (default)
Signed-off-by: Simon Glass <sjg@chromium.org>
13 years ago
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fprintf(stderr, "Property length must be a multiple of "
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"selected data size\n");
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return -1;
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}
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fmt[0] = '%';
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fmt[1] = disp->type ? disp->type : 'd';
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fmt[2] = '\0';
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for (i = 0; i < len; i += size, p += size) {
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if (i)
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printf(" ");
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value = size == 4 ? fdt32_to_cpu(*(const uint32_t *)p) :
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size == 2 ? (*p << 8) | p[1] : *p;
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printf(fmt, value);
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}
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return 0;
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}
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/**
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* Show the data for a given node (and perhaps property) according to the
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* display option provided.
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*
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* @param blob FDT blob
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* @param disp Display information / options
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* @param node Node to display
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* @param property Name of property to display, or NULL if none
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* @return 0 if ok, -ve on error
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*/
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static int show_data_for_item(const void *blob, struct display_info *disp,
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int node, const char *property)
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{
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const void *value = NULL;
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int len, err = 0;
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value = fdt_getprop(blob, node, property, &len);
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if (value) {
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if (show_data(disp, value, len))
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err = -1;
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else
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printf("\n");
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} else {
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report_error(property, len);
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err = -1;
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}
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return err;
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}
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/**
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* Run the main fdtget operation, given a filename and valid arguments
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*
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* @param disp Display information / options
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* @param filename Filename of blob file
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* @param arg List of arguments to process
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* @param arg_count Number of arguments
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* @param return 0 if ok, -ve on error
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*/
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static int do_fdtget(struct display_info *disp, const char *filename,
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char **arg, int arg_count)
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{
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char *blob;
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int i, node;
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blob = utilfdt_read(filename);
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if (!blob)
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return -1;
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for (i = 0; i + 2 <= arg_count; i += 2) {
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node = fdt_path_offset(blob, arg[i]);
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Add fdtget utility to read property values from a device tree
This simply utility makes it easy for scripts to read values from the device
tree. It is written in C and uses the same libfdt as the rest of the dtc
package.
What is it for:
- Reading fdt values from scripts
- Extracting fdt information within build systems
- Looking at particular values without having to dump the entire tree
To use it, specify the fdt binary file on command line followed by a list of
node, property pairs. The utility then looks up each node, finds the property
and displays the value.
Each value is printed on a new line.
fdtget tries to guess the type of each property based on its contents. This
is not always reliable, so you can use the -t option to force fdtget to decode
the value as a string, or byte, etc.
To read from stdin, use - as the file.
Usage:
fdtget <options> <dt file> [<node> <property>]...
Options:
-t <type> Type of data
-h Print this help
<type> s=string, i=int, u=unsigned, x=hex
Optional modifier prefix:
hh or b=byte, h=2 byte, l=4 byte (default)
Signed-off-by: Simon Glass <sjg@chromium.org>
13 years ago
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if (node < 0) {
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report_error(arg[i], node);
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Add fdtget utility to read property values from a device tree
This simply utility makes it easy for scripts to read values from the device
tree. It is written in C and uses the same libfdt as the rest of the dtc
package.
What is it for:
- Reading fdt values from scripts
- Extracting fdt information within build systems
- Looking at particular values without having to dump the entire tree
To use it, specify the fdt binary file on command line followed by a list of
node, property pairs. The utility then looks up each node, finds the property
and displays the value.
Each value is printed on a new line.
fdtget tries to guess the type of each property based on its contents. This
is not always reliable, so you can use the -t option to force fdtget to decode
the value as a string, or byte, etc.
To read from stdin, use - as the file.
Usage:
fdtget <options> <dt file> [<node> <property>]...
Options:
-t <type> Type of data
-h Print this help
<type> s=string, i=int, u=unsigned, x=hex
Optional modifier prefix:
hh or b=byte, h=2 byte, l=4 byte (default)
Signed-off-by: Simon Glass <sjg@chromium.org>
13 years ago
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return -1;
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}
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if (show_data_for_item(blob, disp, node, arg[i + 1]))
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Add fdtget utility to read property values from a device tree
This simply utility makes it easy for scripts to read values from the device
tree. It is written in C and uses the same libfdt as the rest of the dtc
package.
What is it for:
- Reading fdt values from scripts
- Extracting fdt information within build systems
- Looking at particular values without having to dump the entire tree
To use it, specify the fdt binary file on command line followed by a list of
node, property pairs. The utility then looks up each node, finds the property
and displays the value.
Each value is printed on a new line.
fdtget tries to guess the type of each property based on its contents. This
is not always reliable, so you can use the -t option to force fdtget to decode
the value as a string, or byte, etc.
To read from stdin, use - as the file.
Usage:
fdtget <options> <dt file> [<node> <property>]...
Options:
-t <type> Type of data
-h Print this help
<type> s=string, i=int, u=unsigned, x=hex
Optional modifier prefix:
hh or b=byte, h=2 byte, l=4 byte (default)
Signed-off-by: Simon Glass <sjg@chromium.org>
13 years ago
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return -1;
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}
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return 0;
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}
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static const char *usage_msg =
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"fdtget - read values from device tree\n"
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"\n"
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"Each value is printed on a new line.\n\n"
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"Usage:\n"
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" fdtget <options> <dt file> [<node> <property>]...\n"
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"Options:\n"
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"\t-t <type>\tType of data\n"
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"\t-h\t\tPrint this help\n\n"
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USAGE_TYPE_MSG;
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static void usage(const char *msg)
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{
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if (msg)
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fprintf(stderr, "Error: %s\n\n", msg);
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fprintf(stderr, "%s", usage_msg);
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exit(2);
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}
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int main(int argc, char *argv[])
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{
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char *filename = NULL;
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struct display_info disp;
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/* set defaults */
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memset(&disp, '\0', sizeof(disp));
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disp.size = -1;
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for (;;) {
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int c = getopt(argc, argv, "ht:");
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if (c == -1)
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break;
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switch (c) {
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case 'h':
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case '?':
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usage(NULL);
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case 't':
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if (utilfdt_decode_type(optarg, &disp.type,
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&disp.size))
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usage("Invalid type string");
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break;
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}
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}
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if (optind < argc)
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filename = argv[optind++];
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if (!filename)
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usage("Missing filename");
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argv += optind;
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argc -= optind;
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/* Allow no arguments, and silently succeed */
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if (!argc)
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return 0;
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/* Check for node, property arguments */
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if (argc % 2)
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usage("Must have an even number of arguments");
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if (do_fdtget(&disp, filename, argv, argc))
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return 1;
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return 0;
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}
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