Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
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linux
1#ifndef __SUBCMD_UTIL_H
2#define __SUBCMD_UTIL_H
3
4#include <stdarg.h>
5#include <stdlib.h>
6#include <stdio.h>
7
8#define NORETURN __attribute__((__noreturn__))
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 && !size)
53 ret = realloc(ptr, 1);
54 if (!ret) {
55 ret = realloc(ptr, size);
56 if (!ret && !size)
57 ret = realloc(ptr, 1);
58 if (!ret)
59 die("Out of memory, realloc failed");
60 }
61 return ret;
62}
63
64#define astrcatf(out, fmt, ...) \
65({ \
66 char *tmp = *(out); \
67 if (asprintf((out), "%s" fmt, tmp ?: "", ## __VA_ARGS__) == -1) \
68 die("asprintf failed"); \
69 free(tmp); \
70})
71
72static inline void astrcat(char **out, const char *add)
73{
74 char *tmp = *out;
75
76 if (asprintf(out, "%s%s", tmp ?: "", add) == -1)
77 die("asprintf failed");
78
79 free(tmp);
80}
81
82static inline int prefixcmp(const char *str, const char *prefix)
83{
84 for (; ; str++, prefix++)
85 if (!*prefix)
86 return 0;
87 else if (*str != *prefix)
88 return (unsigned char)*prefix - (unsigned char)*str;
89}
90
91#endif /* __SUBCMD_UTIL_H */