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