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
10static 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
17static __noreturn inline void die(const char *err, ...)
18{
19	va_list params;
20
21	va_start(params, err);
22	report(" 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
49static inline void *xrealloc(void *ptr, size_t size)
50{
51	void *ret = realloc(ptr, size);
52	if (!ret)
53		die("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
65static 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("asprintf failed");
71
72	free(tmp);
73}
74
75#endif /* __SUBCMD_UTIL_H */
76