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1843b4e0 JP |
1 | #ifndef __SUBCMD_UTIL_H |
2 | #define __SUBCMD_UTIL_H | |
901421a5 | 3 | |
2f4ce5ec JP |
4 | #include <stdarg.h> |
5 | #include <stdlib.h> | |
901421a5 JP |
6 | #include <stdio.h> |
7 | ||
2f4ce5ec JP |
8 | #define NORETURN __attribute__((__noreturn__)) |
9 | ||
10 | static 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 | ||
17 | static 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 | ||
49 | static 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 | ||
901421a5 JP |
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 | ||
72 | static 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 | ||
2f4ce5ec JP |
82 | static 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 | ||
1843b4e0 | 91 | #endif /* __SUBCMD_UTIL_H */ |