increase portability of NORETURN declarations
[git/git.git] / usage.c
CommitLineData
0fcfd160
LT
1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
4050c0df 6#include "git-compat-util.h"
0fcfd160
LT
7
8static void report(const char *prefix, const char *err, va_list params)
9{
389d1767 10 char msg[1024];
d048a96e
NP
11 vsnprintf(msg, sizeof(msg), err, params);
12 fprintf(stderr, "%s%s\n", prefix, msg);
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LT
13}
14
ce88ac5b 15static NORETURN void usage_builtin(const char *err)
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LT
16{
17 fprintf(stderr, "usage: %s\n", err);
5d1a5c02 18 exit(129);
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LT
19}
20
ce88ac5b 21static NORETURN void die_builtin(const char *err, va_list params)
39a3f5ea
PB
22{
23 report("fatal: ", err, params);
24 exit(128);
25}
26
ce88ac5b 27static void error_builtin(const char *err, va_list params)
39a3f5ea
PB
28{
29 report("error: ", err, params);
30}
31
fa39b6b5
SP
32static void warn_builtin(const char *warn, va_list params)
33{
34 report("warning: ", warn, params);
35}
39a3f5ea
PB
36
37/* If we are in a dlopen()ed .so write to a global variable would segfault
38 * (ugh), so keep things static. */
a4f3131c
EFL
39static NORETURN void (*usage_routine)(const char *err) = usage_builtin;
40static NORETURN void (*die_routine)(const char *err, va_list params) = die_builtin;
39a3f5ea 41static void (*error_routine)(const char *err, va_list params) = error_builtin;
fa39b6b5 42static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
39a3f5ea 43
a4f3131c 44void set_die_routine(NORETURN void (*routine)(const char *err, va_list params))
39a3f5ea
PB
45{
46 die_routine = routine;
47}
48
39a3f5ea
PB
49void usage(const char *err)
50{
51 usage_routine(err);
52}
53
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LT
54void die(const char *err, ...)
55{
56 va_list params;
57
58 va_start(params, err);
39a3f5ea 59 die_routine(err, params);
0fcfd160 60 va_end(params);
0fcfd160
LT
61}
62
b875036e
TR
63void die_errno(const char *fmt, ...)
64{
65 va_list params;
66 char fmt_with_err[1024];
f8b5a8e1
JH
67 char str_error[256], *err;
68 int i, j;
69
70 err = strerror(errno);
71 for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
72 if ((str_error[j++] = err[i++]) != '%')
73 continue;
74 if (j < sizeof(str_error) - 1) {
75 str_error[j++] = '%';
76 } else {
77 /* No room to double the '%', so we overwrite it with
78 * '\0' below */
79 j--;
80 break;
81 }
82 }
83 str_error[j] = 0;
84 snprintf(fmt_with_err, sizeof(fmt_with_err), "%s: %s", fmt, str_error);
b875036e
TR
85
86 va_start(params, fmt);
87 die_routine(fmt_with_err, params);
88 va_end(params);
89}
90
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LT
91int error(const char *err, ...)
92{
93 va_list params;
94
95 va_start(params, err);
39a3f5ea 96 error_routine(err, params);
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LT
97 va_end(params);
98 return -1;
99}
fa39b6b5 100
46efd2d9 101void warning(const char *warn, ...)
fa39b6b5
SP
102{
103 va_list params;
104
105 va_start(params, warn);
106 warn_routine(warn, params);
107 va_end(params);
108}