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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
242 lines
6.9 KiB
C
242 lines
6.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef UTIL_H
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#define UTIL_H
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#include <stdarg.h>
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#include <stdbool.h>
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#include <getopt.h>
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/*
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* Copyright 2011 The Chromium Authors, All Rights Reserved.
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* Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc.
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*/
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#ifdef __GNUC__
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#define PRINTF(i, j) __attribute__((format (printf, i, j)))
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#define NORETURN __attribute__((noreturn))
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#else
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#define PRINTF(i, j)
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#define NORETURN
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#endif
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#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
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#define stringify(s) stringify_(s)
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#define stringify_(s) #s
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static inline void NORETURN PRINTF(1, 2) die(const char *str, ...)
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{
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va_list ap;
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va_start(ap, str);
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fprintf(stderr, "FATAL ERROR: ");
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vfprintf(stderr, str, ap);
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va_end(ap);
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exit(1);
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}
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static inline void *xmalloc(size_t len)
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{
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void *new = malloc(len);
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if (!new)
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die("malloc() failed\n");
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return new;
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}
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static inline void *xrealloc(void *p, size_t len)
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{
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void *new = realloc(p, len);
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if (!new)
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die("realloc() failed (len=%zd)\n", len);
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return new;
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}
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extern char *xstrdup(const char *s);
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extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...);
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extern int PRINTF(2, 3) xasprintf_append(char **strp, const char *fmt, ...);
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extern int xavsprintf_append(char **strp, const char *fmt, va_list ap);
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extern char *join_path(const char *path, const char *name);
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/**
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* Check a property of a given length to see if it is all printable and
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* has a valid terminator. The property can contain either a single string,
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* or multiple strings each of non-zero length.
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*
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* @param data The string to check
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* @param len The string length including terminator
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* @return 1 if a valid printable string, 0 if not
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*/
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bool util_is_printable_string(const void *data, int len);
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/*
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* Parse an escaped character starting at index i in string s. The resulting
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* character will be returned and the index i will be updated to point at the
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* character directly after the end of the encoding, this may be the '\0'
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* terminator of the string.
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*/
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char get_escape_char(const char *s, int *i);
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/**
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* Read a device tree file into a buffer. This will report any errors on
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* stderr.
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*
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* @param filename The filename to read, or - for stdin
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* @param len If non-NULL, the amount of data we managed to read
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* @return Pointer to allocated buffer containing fdt, or NULL on error
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*/
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char *utilfdt_read(const char *filename, size_t *len);
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/**
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* Read a device tree file into a buffer. Does not report errors, but only
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* returns them. The value returned can be passed to strerror() to obtain
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* an error message for the user.
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*
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* @param filename The filename to read, or - for stdin
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* @param buffp Returns pointer to buffer containing fdt
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* @param len If non-NULL, the amount of data we managed to read
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* @return 0 if ok, else an errno value representing the error
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*/
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int utilfdt_read_err(const char *filename, char **buffp, size_t *len);
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/**
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* Write a device tree buffer to a file. This will report any errors on
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* stderr.
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*
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* @param filename The filename to write, or - for stdout
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* @param blob Poiner to buffer containing fdt
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* @return 0 if ok, -1 on error
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*/
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int utilfdt_write(const char *filename, const void *blob);
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/**
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* Write a device tree buffer to a file. Does not report errors, but only
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* returns them. The value returned can be passed to strerror() to obtain
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* an error message for the user.
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*
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* @param filename The filename to write, or - for stdout
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* @param blob Poiner to buffer containing fdt
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* @return 0 if ok, else an errno value representing the error
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*/
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int utilfdt_write_err(const char *filename, const void *blob);
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/**
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* Decode a data type string. The purpose of this string
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*
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* The string consists of an optional character followed by the type:
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* Modifier characters:
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* hh or b 1 byte
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* h 2 byte
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* l 4 byte, default
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*
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* Type character:
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* s string
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* i signed integer
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* u unsigned integer
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* x hex
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*
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* TODO: Implement ll modifier (8 bytes)
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* TODO: Implement o type (octal)
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*
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* @param fmt Format string to process
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* @param type Returns type found(s/d/u/x), or 0 if none
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* @param size Returns size found(1,2,4,8) or 4 if none
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* @return 0 if ok, -1 on error (no type given, or other invalid format)
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*/
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int utilfdt_decode_type(const char *fmt, int *type, int *size);
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/*
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* This is a usage message fragment for the -t option. It is the format
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* supported by utilfdt_decode_type.
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*/
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#define USAGE_TYPE_MSG \
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"<type>\ts=string, i=int, u=unsigned, x=hex\n" \
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"\tOptional modifier prefix:\n" \
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"\t\thh or b=byte, h=2 byte, l=4 byte (default)";
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/**
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* Print property data in a readable format to stdout
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*
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* Properties that look like strings will be printed as strings. Otherwise
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* the data will be displayed either as cells (if len is a multiple of 4
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* bytes) or bytes.
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*
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* If len is 0 then this function does nothing.
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*
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* @param data Pointers to property data
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* @param len Length of property data
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*/
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void utilfdt_print_data(const char *data, int len);
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/**
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* Show source version and exit
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*/
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void NORETURN util_version(void);
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/**
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* Show usage and exit
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*
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* This helps standardize the output of various utils. You most likely want
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* to use the usage() helper below rather than call this.
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*
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* @param errmsg If non-NULL, an error message to display
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* @param synopsis The initial example usage text (and possible examples)
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* @param short_opts The string of short options
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* @param long_opts The structure of long options
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* @param opts_help An array of help strings (should align with long_opts)
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*/
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void NORETURN util_usage(const char *errmsg, const char *synopsis,
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const char *short_opts,
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struct option const long_opts[],
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const char * const opts_help[]);
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/**
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* Show usage and exit
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*
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* If you name all your usage variables with usage_xxx, then you can call this
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* help macro rather than expanding all arguments yourself.
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*
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* @param errmsg If non-NULL, an error message to display
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*/
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#define usage(errmsg) \
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util_usage(errmsg, usage_synopsis, usage_short_opts, \
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usage_long_opts, usage_opts_help)
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/**
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* Call getopt_long() with standard options
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*
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* Since all util code runs getopt in the same way, provide a helper.
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*/
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#define util_getopt_long() getopt_long(argc, argv, usage_short_opts, \
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usage_long_opts, NULL)
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/* Helper for aligning long_opts array */
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#define a_argument required_argument
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/* Helper for usage_short_opts string constant */
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#define USAGE_COMMON_SHORT_OPTS "hV"
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/* Helper for usage_long_opts option array */
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#define USAGE_COMMON_LONG_OPTS \
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{"help", no_argument, NULL, 'h'}, \
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{"version", no_argument, NULL, 'V'}, \
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{NULL, no_argument, NULL, 0x0}
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/* Helper for usage_opts_help array */
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#define USAGE_COMMON_OPTS_HELP \
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"Print this help and exit", \
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"Print version and exit", \
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NULL
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/* Helper for getopt case statements */
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#define case_USAGE_COMMON_FLAGS \
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case 'h': usage(NULL); \
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case 'V': util_version(); \
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case '?': usage("unknown option");
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#endif /* UTIL_H */
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