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
report(const char * prefix,const char * err,va_list params)11 static 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
die(const char * err,...)18 static 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
xrealloc(void * ptr,size_t size)50 static 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
astrcat(char ** out,const char * add)66 static 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 */
77