247 lines
6.9 KiB
C
247 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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#ifdef __clang__
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#define PRINTF(i, j) __attribute__((format (printf, i, j)))
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#else
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#define PRINTF(i, j) __attribute__((format (gnu_printf, i, j)))
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#endif
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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 Pointer 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 Pointer 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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