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