1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef __SUBCMD_UTIL_H |
3 | #define __SUBCMD_UTIL_H |
4 | |
5 | #include <stdarg.h> |
6 | #include <stdlib.h> |
7 | #include <stdio.h> |
8 | #include <linux/compiler.h> |
9 | |
10 | static inline void report(const char *prefix, const char *err, va_list params) |
11 | { |
12 | char msg[1024]; |
13 | vsnprintf(msg, sizeof(msg), err, params); |
14 | fprintf(stderr, " %s%s\n" , prefix, msg); |
15 | } |
16 | |
17 | static __noreturn inline void die(const char *err, ...) |
18 | { |
19 | va_list params; |
20 | |
21 | va_start(params, err); |
22 | report(prefix: " Fatal: " , err, params); |
23 | exit(128); |
24 | va_end(params); |
25 | } |
26 | |
27 | #define zfree(ptr) ({ free(*ptr); *ptr = NULL; }) |
28 | |
29 | #define alloc_nr(x) (((x)+16)*3/2) |
30 | |
31 | /* |
32 | * Realloc the buffer pointed at by variable 'x' so that it can hold |
33 | * at least 'nr' entries; the number of entries currently allocated |
34 | * is 'alloc', using the standard growing factor alloc_nr() macro. |
35 | * |
36 | * DO NOT USE any expression with side-effect for 'x' or 'alloc'. |
37 | */ |
38 | #define ALLOC_GROW(x, nr, alloc) \ |
39 | do { \ |
40 | if ((nr) > alloc) { \ |
41 | if (alloc_nr(alloc) < (nr)) \ |
42 | alloc = (nr); \ |
43 | else \ |
44 | alloc = alloc_nr(alloc); \ |
45 | x = xrealloc((x), alloc * sizeof(*(x))); \ |
46 | } \ |
47 | } while(0) |
48 | |
49 | static inline void *xrealloc(void *ptr, size_t size) |
50 | { |
51 | void *ret = realloc(ptr, size); |
52 | if (!ret) |
53 | die(err: "Out of memory, realloc failed" ); |
54 | return ret; |
55 | } |
56 | |
57 | #define astrcatf(out, fmt, ...) \ |
58 | ({ \ |
59 | char *tmp = *(out); \ |
60 | if (asprintf((out), "%s" fmt, tmp ?: "", ## __VA_ARGS__) == -1) \ |
61 | die("asprintf failed"); \ |
62 | free(tmp); \ |
63 | }) |
64 | |
65 | static inline void astrcat(char **out, const char *add) |
66 | { |
67 | char *tmp = *out; |
68 | |
69 | if (asprintf(out, "%s%s" , tmp ?: "" , add) == -1) |
70 | die(err: "asprintf failed" ); |
71 | |
72 | free(tmp); |
73 | } |
74 | |
75 | #endif /* __SUBCMD_UTIL_H */ |
76 | |