1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef UTIL_H 3 #define UTIL_H 4 5 #include <stdarg.h> 6 #include <stdbool.h> 7 #include <getopt.h> 8 9 /* 10 * Copyright 2011 The Chromium Authors, All Rights Reserved. 11 * Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc. 12 */ 13 14 #ifdef __GNUC__ 15 #define PRINTF(i, j) __attribute__((format (printf, i, j))) 16 #define NORETURN __attribute__((noreturn)) 17 #else 18 #define PRINTF(i, j) 19 #define NORETURN 20 #endif 21 22 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) 23 24 #define stringify(s) stringify_(s) 25 #define stringify_(s) #s 26 27 static inline void NORETURN PRINTF(1, 2) die(const char *str, ...) 28 { 29 va_list ap; 30 31 va_start(ap, str); 32 fprintf(stderr, "FATAL ERROR: "); 33 vfprintf(stderr, str, ap); 34 va_end(ap); 35 exit(1); 36 } 37 38 static inline void *xmalloc(size_t len) 39 { 40 void *new = malloc(len); 41 42 if (!new) 43 die("malloc() failed\n"); 44 45 return new; 46 } 47 48 static inline void *xrealloc(void *p, size_t len) 49 { 50 void *new = realloc(p, len); 51 52 if (!new) 53 die("realloc() failed (len=%zd)\n", len); 54 55 return new; 56 } 57 58 extern char *xstrdup(const char *s); 59 60 extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...); 61 extern int PRINTF(2, 3) xasprintf_append(char **strp, const char *fmt, ...); 62 extern int xavsprintf_append(char **strp, const char *fmt, va_list ap); 63 extern char *join_path(const char *path, const char *name); 64 65 /** 66 * Check a property of a given length to see if it is all printable and 67 * has a valid terminator. The property can contain either a single string, 68 * or multiple strings each of non-zero length. 69 * 70 * @param data The string to check 71 * @param len The string length including terminator 72 * @return 1 if a valid printable string, 0 if not 73 */ 74 bool util_is_printable_string(const void *data, int len); 75 76 /* 77 * Parse an escaped character starting at index i in string s. The resulting 78 * character will be returned and the index i will be updated to point at the 79 * character directly after the end of the encoding, this may be the '\0' 80 * terminator of the string. 81 */ 82 char get_escape_char(const char *s, int *i); 83 84 /** 85 * Read a device tree file into a buffer. This will report any errors on 86 * stderr. 87 * 88 * @param filename The filename to read, or - for stdin 89 * @param len If non-NULL, the amount of data we managed to read 90 * @return Pointer to allocated buffer containing fdt, or NULL on error 91 */ 92 char *utilfdt_read(const char *filename, size_t *len); 93 94 /** 95 * Read a device tree file into a buffer. Does not report errors, but only 96 * returns them. The value returned can be passed to strerror() to obtain 97 * an error message for the user. 98 * 99 * @param filename The filename to read, or - for stdin 100 * @param buffp Returns pointer to buffer containing fdt 101 * @param len If non-NULL, the amount of data we managed to read 102 * @return 0 if ok, else an errno value representing the error 103 */ 104 int utilfdt_read_err(const char *filename, char **buffp, size_t *len); 105 106 /** 107 * Write a device tree buffer to a file. This will report any errors on 108 * stderr. 109 * 110 * @param filename The filename to write, or - for stdout 111 * @param blob Poiner to buffer containing fdt 112 * @return 0 if ok, -1 on error 113 */ 114 int utilfdt_write(const char *filename, const void *blob); 115 116 /** 117 * Write a device tree buffer to a file. Does not report errors, but only 118 * returns them. The value returned can be passed to strerror() to obtain 119 * an error message for the user. 120 * 121 * @param filename The filename to write, or - for stdout 122 * @param blob Poiner to buffer containing fdt 123 * @return 0 if ok, else an errno value representing the error 124 */ 125 int utilfdt_write_err(const char *filename, const void *blob); 126 127 /** 128 * Decode a data type string. The purpose of this string 129 * 130 * The string consists of an optional character followed by the type: 131 * Modifier characters: 132 * hh or b 1 byte 133 * h 2 byte 134 * l 4 byte, default 135 * 136 * Type character: 137 * s string 138 * i signed integer 139 * u unsigned integer 140 * x hex 141 * 142 * TODO: Implement ll modifier (8 bytes) 143 * TODO: Implement o type (octal) 144 * 145 * @param fmt Format string to process 146 * @param type Returns type found(s/d/u/x), or 0 if none 147 * @param size Returns size found(1,2,4,8) or 4 if none 148 * @return 0 if ok, -1 on error (no type given, or other invalid format) 149 */ 150 int utilfdt_decode_type(const char *fmt, int *type, int *size); 151 152 /* 153 * This is a usage message fragment for the -t option. It is the format 154 * supported by utilfdt_decode_type. 155 */ 156 157 #define USAGE_TYPE_MSG \ 158 "<type>\ts=string, i=int, u=unsigned, x=hex\n" \ 159 "\tOptional modifier prefix:\n" \ 160 "\t\thh or b=byte, h=2 byte, l=4 byte (default)"; 161 162 /** 163 * Print property data in a readable format to stdout 164 * 165 * Properties that look like strings will be printed as strings. Otherwise 166 * the data will be displayed either as cells (if len is a multiple of 4 167 * bytes) or bytes. 168 * 169 * If len is 0 then this function does nothing. 170 * 171 * @param data Pointers to property data 172 * @param len Length of property data 173 */ 174 void utilfdt_print_data(const char *data, int len); 175 176 /** 177 * Show source version and exit 178 */ 179 void NORETURN util_version(void); 180 181 /** 182 * Show usage and exit 183 * 184 * This helps standardize the output of various utils. You most likely want 185 * to use the usage() helper below rather than call this. 186 * 187 * @param errmsg If non-NULL, an error message to display 188 * @param synopsis The initial example usage text (and possible examples) 189 * @param short_opts The string of short options 190 * @param long_opts The structure of long options 191 * @param opts_help An array of help strings (should align with long_opts) 192 */ 193 void NORETURN util_usage(const char *errmsg, const char *synopsis, 194 const char *short_opts, 195 struct option const long_opts[], 196 const char * const opts_help[]); 197 198 /** 199 * Show usage and exit 200 * 201 * If you name all your usage variables with usage_xxx, then you can call this 202 * help macro rather than expanding all arguments yourself. 203 * 204 * @param errmsg If non-NULL, an error message to display 205 */ 206 #define usage(errmsg) \ 207 util_usage(errmsg, usage_synopsis, usage_short_opts, \ 208 usage_long_opts, usage_opts_help) 209 210 /** 211 * Call getopt_long() with standard options 212 * 213 * Since all util code runs getopt in the same way, provide a helper. 214 */ 215 #define util_getopt_long() getopt_long(argc, argv, usage_short_opts, \ 216 usage_long_opts, NULL) 217 218 /* Helper for aligning long_opts array */ 219 #define a_argument required_argument 220 221 /* Helper for usage_short_opts string constant */ 222 #define USAGE_COMMON_SHORT_OPTS "hV" 223 224 /* Helper for usage_long_opts option array */ 225 #define USAGE_COMMON_LONG_OPTS \ 226 {"help", no_argument, NULL, 'h'}, \ 227 {"version", no_argument, NULL, 'V'}, \ 228 {NULL, no_argument, NULL, 0x0} 229 230 /* Helper for usage_opts_help array */ 231 #define USAGE_COMMON_OPTS_HELP \ 232 "Print this help and exit", \ 233 "Print version and exit", \ 234 NULL 235 236 /* Helper for getopt case statements */ 237 #define case_USAGE_COMMON_FLAGS \ 238 case 'h': usage(NULL); \ 239 case 'V': util_version(); \ 240 case '?': usage("unknown option"); 241 242 #endif /* UTIL_H */ 243