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/* SPDX-License-Identifier: GPL-2.0-or-later / #ifndef UTIL_H #define UTIL_H #include <stdarg.h> #include <stdbool.h> #include <getopt.h> / * Copyright 2011 The Chromium Authors, All Rights Reserved. * Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc. / #ifdef __GNUC__ #define PRINTF(i, j) __attribute__((format (printf, i, j))) #define NORETURN __attribute__((noreturn)) #else #define PRINTF(i, j) #define NORETURN #endif #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) #define stringify(s) stringify_(s) #define stringify_(s) #s static inline void NORETURN PRINTF(1, 2) die(const char str, ...) { va_list ap; va_start(ap, str); fprintf(stderr, "FATAL ERROR: "); vfprintf(stderr, str, ap); va_end(ap); exit(1); } static inline void xmalloc(size_t len) { void new = malloc(len); if (!new) die("malloc() failed\n"); return new; } static inline void xrealloc(void p, size_t len) { void new = realloc(p, len); if (!new) die("realloc() failed (len=%zd)\n", len); return new; } extern char xstrdup(const char s); extern int PRINTF(2, 3) xasprintf(char strp, const char fmt, ...); extern int PRINTF(2, 3) xasprintf_append(char *strp, const char fmt, ...); extern int xavsprintf_append(char *strp, const char fmt, va_list ap); extern char join_path(const char path, const char name); /* * Check a property of a given length to see if it is all printable and * has a valid terminator. The property can contain either a single string, * or multiple strings each of non-zero length. * * @param data The string to check * @param len The string length including terminator * @return 1 if a valid printable string, 0 if not / bool util_is_printable_string(const void data, int len); /* * Parse an escaped character starting at index i in string s. The resulting * character will be returned and the index i will be updated to point at the * character directly after the end of the encoding, this may be the '\0' * terminator of the string. / char get_escape_char(const char s, int i); /* * Read a device tree file into a buffer. This will report any errors on * stderr. * * @param filename The filename to read, or - for stdin * @param len If non-NULL, the amount of data we managed to read * @return Pointer to allocated buffer containing fdt, or NULL on error / char utilfdt_read(const char filename, size_t len); /** * Read a device tree file into a buffer. Does not report errors, but only * returns them. The value returned can be passed to strerror() to obtain * an error message for the user. * * @param filename The filename to read, or - for stdin * @param buffp Returns pointer to buffer containing fdt * @param len If non-NULL, the amount of data we managed to read * @return 0 if ok, else an errno value representing the error / int utilfdt_read_err(const char filename, char *buffp, size_t len); /** * Write a device tree buffer to a file. This will report any errors on * stderr. * * @param filename The filename to write, or - for stdout * @param blob Pointer to buffer containing fdt * @return 0 if ok, -1 on error / int utilfdt_write(const char filename, const void blob); /* * Write a device tree buffer to a file. Does not report errors, but only * returns them. The value returned can be passed to strerror() to obtain * an error message for the user. * * @param filename The filename to write, or - for stdout * @param blob Pointer to buffer containing fdt * @return 0 if ok, else an errno value representing the error / int utilfdt_write_err(const char filename, const void blob); /* * Decode a data type string. The purpose of this string * * The string consists of an optional character followed by the type: * Modifier characters: * hh or b 1 byte * h 2 byte * l 4 byte, default * * Type character: * s string * i signed integer * u unsigned integer * x hex * * TODO: Implement ll modifier (8 bytes) * TODO: Implement o type (octal) * * @param fmt Format string to process * @param type Returns type found(s/d/u/x), or 0 if none * @param size Returns size found(1,2,4,8) or 4 if none * @return 0 if ok, -1 on error (no type given, or other invalid format) / int utilfdt_decode_type(const char fmt, int type, int size); /* * This is a usage message fragment for the -t option. It is the format * supported by utilfdt_decode_type. / #define USAGE_TYPE_MSG \ "<type>\ts=string, i=int, u=unsigned, x=hex\n" \ "\tOptional modifier prefix:\n" \ "\t\thh or b=byte, h=2 byte, l=4 byte (default)"; /* * Print property data in a readable format to stdout * * Properties that look like strings will be printed as strings. Otherwise * the data will be displayed either as cells (if len is a multiple of 4 * bytes) or bytes. * * If len is 0 then this function does nothing. * * @param data Pointers to property data * @param len Length of property data / void utilfdt_print_data(const char data, int len); /** * Show source version and exit / void NORETURN util_version(void); /* * Show usage and exit * * This helps standardize the output of various utils. You most likely want * to use the usage() helper below rather than call this. * * @param errmsg If non-NULL, an error message to display * @param synopsis The initial example usage text (and possible examples) * @param short_opts The string of short options * @param long_opts The structure of long options * @param opts_help An array of help strings (should align with long_opts) / void NORETURN util_usage(const char errmsg, const char synopsis, const char short_opts, struct option const long_opts[], const char * const opts_help[]); /** * Show usage and exit * * If you name all your usage variables with usage_xxx, then you can call this * help macro rather than expanding all arguments yourself. * * @param errmsg If non-NULL, an error message to display / #define usage(errmsg) \ util_usage(errmsg, usage_synopsis, usage_short_opts, \ usage_long_opts, usage_opts_help) /* * Call getopt_long() with standard options * * Since all util code runs getopt in the same way, provide a helper. / #define util_getopt_long() getopt_long(argc, argv, usage_short_opts, \ usage_long_opts, NULL) / Helper for aligning long_opts array / #define a_argument required_argument / Helper for usage_short_opts string constant / #define USAGE_COMMON_SHORT_OPTS "hV" / Helper for usage_long_opts option array / #define USAGE_COMMON_LONG_OPTS \ {"help", no_argument, NULL, 'h'}, \ {"version", no_argument, NULL, 'V'}, \ {NULL, no_argument, NULL, 0x0} / Helper for usage_opts_help array / #define USAGE_COMMON_OPTS_HELP \ "Print this help and exit", \ "Print version and exit", \ NULL / Helper for getopt case statements / #define case_USAGE_COMMON_FLAGS \ case 'h': usage(NULL); \ case 'V': util_version(); \ case '?': usage("unknown option"); #endif / UTIL_H */

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