Customizable error handlers
[git/git.git] / usage.c
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1/*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
4050c0df 6#include "git-compat-util.h"
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7
8static void report(const char *prefix, const char *err, va_list params)
9{
10 fputs(prefix, stderr);
11 vfprintf(stderr, err, params);
12 fputs("\n", stderr);
13}
14
39a3f5ea 15void usage_builtin(const char *err)
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16{
17 fprintf(stderr, "usage: %s\n", err);
5d1a5c02 18 exit(129);
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19}
20
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21void die_builtin(const char *err, va_list params)
22{
23 report("fatal: ", err, params);
24 exit(128);
25}
26
27void error_builtin(const char *err, va_list params)
28{
29 report("error: ", err, params);
30}
31
32
33/* If we are in a dlopen()ed .so write to a global variable would segfault
34 * (ugh), so keep things static. */
35static void (*usage_routine)(const char *err) NORETURN = usage_builtin;
36static void (*die_routine)(const char *err, va_list params) NORETURN = die_builtin;
37static void (*error_routine)(const char *err, va_list params) = error_builtin;
38
39void set_usage_routine(void (*routine)(const char *err) NORETURN)
40{
41 usage_routine = routine;
42}
43
44void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN)
45{
46 die_routine = routine;
47}
48
49void set_error_routine(void (*routine)(const char *err, va_list params))
50{
51 error_routine = routine;
52}
53
54
55void usage(const char *err)
56{
57 usage_routine(err);
58}
59
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60void die(const char *err, ...)
61{
62 va_list params;
63
64 va_start(params, err);
39a3f5ea 65 die_routine(err, params);
0fcfd160 66 va_end(params);
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67}
68
69int error(const char *err, ...)
70{
71 va_list params;
72
73 va_start(params, err);
39a3f5ea 74 error_routine(err, params);
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75 va_end(params);
76 return -1;
77}