b781b0061ea5a100ac8f86a0a87d4ac92c77c407
[git/git.git] / usage.c
1 /*
2 * GIT - The information manager from hell
3 *
4 * Copyright (C) Linus Torvalds, 2005
5 */
6 #include "git-compat-util.h"
7
8 static 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
15 void usage_builtin(const char *err)
16 {
17 fprintf(stderr, "usage: %s\n", err);
18 exit(129);
19 }
20
21 void die_builtin(const char *err, va_list params)
22 {
23 report("fatal: ", err, params);
24 exit(128);
25 }
26
27 void 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. */
35 static void (*usage_routine)(const char *err) NORETURN = usage_builtin;
36 static void (*die_routine)(const char *err, va_list params) NORETURN = die_builtin;
37 static void (*error_routine)(const char *err, va_list params) = error_builtin;
38
39 void set_usage_routine(void (*routine)(const char *err) NORETURN)
40 {
41 usage_routine = routine;
42 }
43
44 void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN)
45 {
46 die_routine = routine;
47 }
48
49 void set_error_routine(void (*routine)(const char *err, va_list params))
50 {
51 error_routine = routine;
52 }
53
54
55 void usage(const char *err)
56 {
57 usage_routine(err);
58 }
59
60 void die(const char *err, ...)
61 {
62 va_list params;
63
64 va_start(params, err);
65 die_routine(err, params);
66 va_end(params);
67 }
68
69 int error(const char *err, ...)
70 {
71 va_list params;
72
73 va_start(params, err);
74 error_routine(err, params);
75 va_end(params);
76 return -1;
77 }