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12869ecd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
9130ba88 RH |
2 | #ifndef UTIL_H |
3 | #define UTIL_H | |
658f29a5 | 4 | |
6e9c9686 | 5 | #include <stdlib.h> |
cd296721 | 6 | #include <stdarg.h> |
47605971 | 7 | #include <stdbool.h> |
73ab39b1 | 8 | #include <getopt.h> |
cd296721 | 9 | |
658f29a5 | 10 | /* |
cd296721 | 11 | * Copyright 2011 The Chromium Authors, All Rights Reserved. |
658f29a5 | 12 | * Copyright 2008 Jon Loeliger, Freescale Semiconductor, Inc. |
658f29a5 JB |
13 | */ |
14 | ||
89d12310 | 15 | #ifdef __GNUC__ |
0cec114e | 16 | #ifdef __clang__ |
89d12310 | 17 | #define PRINTF(i, j) __attribute__((format (printf, i, j))) |
0cec114e RH |
18 | #else |
19 | #define PRINTF(i, j) __attribute__((format (gnu_printf, i, j))) | |
20 | #endif | |
89d12310 RH |
21 | #define NORETURN __attribute__((noreturn)) |
22 | #else | |
23 | #define PRINTF(i, j) | |
24 | #define NORETURN | |
25 | #endif | |
26 | ||
73ab39b1 GL |
27 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) |
28 | ||
9130ba88 RH |
29 | #define stringify(s) stringify_(s) |
30 | #define stringify_(s) #s | |
31 | ||
89d12310 | 32 | static inline void NORETURN PRINTF(1, 2) die(const char *str, ...) |
658f29a5 JB |
33 | { |
34 | va_list ap; | |
35 | ||
36 | va_start(ap, str); | |
37 | fprintf(stderr, "FATAL ERROR: "); | |
38 | vfprintf(stderr, str, ap); | |
47605971 | 39 | va_end(ap); |
658f29a5 JB |
40 | exit(1); |
41 | } | |
42 | ||
43 | static inline void *xmalloc(size_t len) | |
44 | { | |
45 | void *new = malloc(len); | |
46 | ||
47 | if (!new) | |
48 | die("malloc() failed\n"); | |
49 | ||
50 | return new; | |
51 | } | |
52 | ||
53 | static inline void *xrealloc(void *p, size_t len) | |
54 | { | |
55 | void *new = realloc(p, len); | |
56 | ||
57 | if (!new) | |
89d12310 | 58 | die("realloc() failed (len=%zd)\n", len); |
658f29a5 JB |
59 | |
60 | return new; | |
61 | } | |
62 | ||
63 | extern char *xstrdup(const char *s); | |
89d12310 RH |
64 | |
65 | extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...); | |
c2e7075c RH |
66 | extern int PRINTF(2, 3) xasprintf_append(char **strp, const char *fmt, ...); |
67 | extern int xavsprintf_append(char **strp, const char *fmt, va_list ap); | |
658f29a5 JB |
68 | extern char *join_path(const char *path, const char *name); |
69 | ||
cd296721 | 70 | /** |
73ab39b1 GL |
71 | * Check a property of a given length to see if it is all printable and |
72 | * has a valid terminator. The property can contain either a single string, | |
73 | * or multiple strings each of non-zero length. | |
cd296721 SW |
74 | * |
75 | * @param data The string to check | |
76 | * @param len The string length including terminator | |
73ab39b1 GL |
77 | * @return 1 if a valid printable string, 0 if not |
78 | */ | |
47605971 | 79 | bool util_is_printable_string(const void *data, int len); |
cd296721 SW |
80 | |
81 | /* | |
82 | * Parse an escaped character starting at index i in string s. The resulting | |
83 | * character will be returned and the index i will be updated to point at the | |
84 | * character directly after the end of the encoding, this may be the '\0' | |
85 | * terminator of the string. | |
86 | */ | |
87 | char get_escape_char(const char *s, int *i); | |
88 | ||
89 | /** | |
90 | * Read a device tree file into a buffer. This will report any errors on | |
91 | * stderr. | |
92 | * | |
93 | * @param filename The filename to read, or - for stdin | |
73ab39b1 | 94 | * @param len If non-NULL, the amount of data we managed to read |
f858927f | 95 | * @return Pointer to allocated buffer containing fdt, or NULL on error |
73ab39b1 | 96 | */ |
f858927f | 97 | char *utilfdt_read(const char *filename, size_t *len); |
73ab39b1 | 98 | |
cd296721 SW |
99 | /** |
100 | * Read a device tree file into a buffer. Does not report errors, but only | |
101 | * returns them. The value returned can be passed to strerror() to obtain | |
102 | * an error message for the user. | |
103 | * | |
104 | * @param filename The filename to read, or - for stdin | |
105 | * @param buffp Returns pointer to buffer containing fdt | |
73ab39b1 | 106 | * @param len If non-NULL, the amount of data we managed to read |
f858927f | 107 | * @return 0 if ok, else an errno value representing the error |
73ab39b1 | 108 | */ |
f858927f | 109 | int utilfdt_read_err(const char *filename, char **buffp, size_t *len); |
cd296721 SW |
110 | |
111 | /** | |
112 | * Write a device tree buffer to a file. This will report any errors on | |
113 | * stderr. | |
114 | * | |
115 | * @param filename The filename to write, or - for stdout | |
9bb9c6a1 | 116 | * @param blob Pointer to buffer containing fdt |
cd296721 SW |
117 | * @return 0 if ok, -1 on error |
118 | */ | |
119 | int utilfdt_write(const char *filename, const void *blob); | |
120 | ||
121 | /** | |
122 | * Write a device tree buffer to a file. Does not report errors, but only | |
123 | * returns them. The value returned can be passed to strerror() to obtain | |
124 | * an error message for the user. | |
125 | * | |
126 | * @param filename The filename to write, or - for stdout | |
9bb9c6a1 | 127 | * @param blob Pointer to buffer containing fdt |
cd296721 SW |
128 | * @return 0 if ok, else an errno value representing the error |
129 | */ | |
130 | int utilfdt_write_err(const char *filename, const void *blob); | |
131 | ||
132 | /** | |
133 | * Decode a data type string. The purpose of this string | |
134 | * | |
135 | * The string consists of an optional character followed by the type: | |
136 | * Modifier characters: | |
137 | * hh or b 1 byte | |
138 | * h 2 byte | |
139 | * l 4 byte, default | |
140 | * | |
141 | * Type character: | |
142 | * s string | |
143 | * i signed integer | |
144 | * u unsigned integer | |
145 | * x hex | |
146 | * | |
147 | * TODO: Implement ll modifier (8 bytes) | |
148 | * TODO: Implement o type (octal) | |
149 | * | |
150 | * @param fmt Format string to process | |
151 | * @param type Returns type found(s/d/u/x), or 0 if none | |
152 | * @param size Returns size found(1,2,4,8) or 4 if none | |
153 | * @return 0 if ok, -1 on error (no type given, or other invalid format) | |
154 | */ | |
155 | int utilfdt_decode_type(const char *fmt, int *type, int *size); | |
156 | ||
157 | /* | |
158 | * This is a usage message fragment for the -t option. It is the format | |
159 | * supported by utilfdt_decode_type. | |
160 | */ | |
161 | ||
162 | #define USAGE_TYPE_MSG \ | |
163 | "<type>\ts=string, i=int, u=unsigned, x=hex\n" \ | |
164 | "\tOptional modifier prefix:\n" \ | |
73ab39b1 GL |
165 | "\t\thh or b=byte, h=2 byte, l=4 byte (default)"; |
166 | ||
167 | /** | |
168 | * Print property data in a readable format to stdout | |
169 | * | |
170 | * Properties that look like strings will be printed as strings. Otherwise | |
171 | * the data will be displayed either as cells (if len is a multiple of 4 | |
172 | * bytes) or bytes. | |
173 | * | |
174 | * If len is 0 then this function does nothing. | |
175 | * | |
176 | * @param data Pointers to property data | |
177 | * @param len Length of property data | |
178 | */ | |
179 | void utilfdt_print_data(const char *data, int len); | |
180 | ||
181 | /** | |
182 | * Show source version and exit | |
183 | */ | |
89d12310 | 184 | void NORETURN util_version(void); |
73ab39b1 GL |
185 | |
186 | /** | |
187 | * Show usage and exit | |
188 | * | |
189 | * This helps standardize the output of various utils. You most likely want | |
190 | * to use the usage() helper below rather than call this. | |
191 | * | |
192 | * @param errmsg If non-NULL, an error message to display | |
193 | * @param synopsis The initial example usage text (and possible examples) | |
194 | * @param short_opts The string of short options | |
195 | * @param long_opts The structure of long options | |
196 | * @param opts_help An array of help strings (should align with long_opts) | |
197 | */ | |
89d12310 RH |
198 | void NORETURN util_usage(const char *errmsg, const char *synopsis, |
199 | const char *short_opts, | |
200 | struct option const long_opts[], | |
201 | const char * const opts_help[]); | |
73ab39b1 GL |
202 | |
203 | /** | |
204 | * Show usage and exit | |
205 | * | |
206 | * If you name all your usage variables with usage_xxx, then you can call this | |
207 | * help macro rather than expanding all arguments yourself. | |
208 | * | |
209 | * @param errmsg If non-NULL, an error message to display | |
210 | */ | |
211 | #define usage(errmsg) \ | |
212 | util_usage(errmsg, usage_synopsis, usage_short_opts, \ | |
213 | usage_long_opts, usage_opts_help) | |
214 | ||
215 | /** | |
216 | * Call getopt_long() with standard options | |
217 | * | |
218 | * Since all util code runs getopt in the same way, provide a helper. | |
219 | */ | |
220 | #define util_getopt_long() getopt_long(argc, argv, usage_short_opts, \ | |
221 | usage_long_opts, NULL) | |
222 | ||
223 | /* Helper for aligning long_opts array */ | |
224 | #define a_argument required_argument | |
225 | ||
226 | /* Helper for usage_short_opts string constant */ | |
227 | #define USAGE_COMMON_SHORT_OPTS "hV" | |
228 | ||
229 | /* Helper for usage_long_opts option array */ | |
230 | #define USAGE_COMMON_LONG_OPTS \ | |
231 | {"help", no_argument, NULL, 'h'}, \ | |
232 | {"version", no_argument, NULL, 'V'}, \ | |
233 | {NULL, no_argument, NULL, 0x0} | |
234 | ||
235 | /* Helper for usage_opts_help array */ | |
236 | #define USAGE_COMMON_OPTS_HELP \ | |
237 | "Print this help and exit", \ | |
238 | "Print version and exit", \ | |
239 | NULL | |
240 | ||
241 | /* Helper for getopt case statements */ | |
242 | #define case_USAGE_COMMON_FLAGS \ | |
243 | case 'h': usage(NULL); \ | |
244 | case 'V': util_version(); \ | |
245 | case '?': usage("unknown option"); | |
cd296721 | 246 | |
9130ba88 | 247 | #endif /* UTIL_H */ |