1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __SUBCMD_UTIL_H
3*4882a593Smuzhiyun #define __SUBCMD_UTIL_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <stdarg.h>
6*4882a593Smuzhiyun #include <stdlib.h>
7*4882a593Smuzhiyun #include <stdio.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #define NORETURN __attribute__((__noreturn__))
10*4882a593Smuzhiyun
report(const char * prefix,const char * err,va_list params)11*4882a593Smuzhiyun static inline void report(const char *prefix, const char *err, va_list params)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun char msg[1024];
14*4882a593Smuzhiyun vsnprintf(msg, sizeof(msg), err, params);
15*4882a593Smuzhiyun fprintf(stderr, " %s%s\n", prefix, msg);
16*4882a593Smuzhiyun }
17*4882a593Smuzhiyun
die(const char * err,...)18*4882a593Smuzhiyun static NORETURN inline void die(const char *err, ...)
19*4882a593Smuzhiyun {
20*4882a593Smuzhiyun va_list params;
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun va_start(params, err);
23*4882a593Smuzhiyun report(" Fatal: ", err, params);
24*4882a593Smuzhiyun exit(128);
25*4882a593Smuzhiyun va_end(params);
26*4882a593Smuzhiyun }
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun #define zfree(ptr) ({ free(*ptr); *ptr = NULL; })
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun #define alloc_nr(x) (((x)+16)*3/2)
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun /*
33*4882a593Smuzhiyun * Realloc the buffer pointed at by variable 'x' so that it can hold
34*4882a593Smuzhiyun * at least 'nr' entries; the number of entries currently allocated
35*4882a593Smuzhiyun * is 'alloc', using the standard growing factor alloc_nr() macro.
36*4882a593Smuzhiyun *
37*4882a593Smuzhiyun * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
38*4882a593Smuzhiyun */
39*4882a593Smuzhiyun #define ALLOC_GROW(x, nr, alloc) \
40*4882a593Smuzhiyun do { \
41*4882a593Smuzhiyun if ((nr) > alloc) { \
42*4882a593Smuzhiyun if (alloc_nr(alloc) < (nr)) \
43*4882a593Smuzhiyun alloc = (nr); \
44*4882a593Smuzhiyun else \
45*4882a593Smuzhiyun alloc = alloc_nr(alloc); \
46*4882a593Smuzhiyun x = xrealloc((x), alloc * sizeof(*(x))); \
47*4882a593Smuzhiyun } \
48*4882a593Smuzhiyun } while(0)
49*4882a593Smuzhiyun
xrealloc(void * ptr,size_t size)50*4882a593Smuzhiyun static inline void *xrealloc(void *ptr, size_t size)
51*4882a593Smuzhiyun {
52*4882a593Smuzhiyun void *ret = realloc(ptr, size);
53*4882a593Smuzhiyun if (!ret)
54*4882a593Smuzhiyun die("Out of memory, realloc failed");
55*4882a593Smuzhiyun return ret;
56*4882a593Smuzhiyun }
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun #define astrcatf(out, fmt, ...) \
59*4882a593Smuzhiyun ({ \
60*4882a593Smuzhiyun char *tmp = *(out); \
61*4882a593Smuzhiyun if (asprintf((out), "%s" fmt, tmp ?: "", ## __VA_ARGS__) == -1) \
62*4882a593Smuzhiyun die("asprintf failed"); \
63*4882a593Smuzhiyun free(tmp); \
64*4882a593Smuzhiyun })
65*4882a593Smuzhiyun
astrcat(char ** out,const char * add)66*4882a593Smuzhiyun static inline void astrcat(char **out, const char *add)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun char *tmp = *out;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun if (asprintf(out, "%s%s", tmp ?: "", add) == -1)
71*4882a593Smuzhiyun die("asprintf failed");
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun free(tmp);
74*4882a593Smuzhiyun }
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun #endif /* __SUBCMD_UTIL_H */
77