ec4cf53b6bf16f7f9b3528a430891d6c68ef64cc
[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 void vreportf(const char *prefix, const char *err, va_list params)
9 {
10 char msg[4096];
11 vsnprintf(msg, sizeof(msg), err, params);
12 fprintf(stderr, "%s%s\n", prefix, msg);
13 }
14
15 static NORETURN void usage_builtin(const char *err, va_list params)
16 {
17 vreportf("usage: ", err, params);
18 exit(129);
19 }
20
21 static NORETURN void die_builtin(const char *err, va_list params)
22 {
23 vreportf("fatal: ", err, params);
24 exit(128);
25 }
26
27 static void error_builtin(const char *err, va_list params)
28 {
29 vreportf("error: ", err, params);
30 }
31
32 static void warn_builtin(const char *warn, va_list params)
33 {
34 vreportf("warning: ", warn, params);
35 }
36
37 /* If we are in a dlopen()ed .so write to a global variable would segfault
38 * (ugh), so keep things static. */
39 static NORETURN_PTR void (*usage_routine)(const char *err, va_list params) = usage_builtin;
40 static NORETURN_PTR void (*die_routine)(const char *err, va_list params) = die_builtin;
41 static void (*error_routine)(const char *err, va_list params) = error_builtin;
42 static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
43
44 void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params))
45 {
46 die_routine = routine;
47 }
48
49 void usagef(const char *err, ...)
50 {
51 va_list params;
52
53 va_start(params, err);
54 usage_routine(err, params);
55 va_end(params);
56 }
57
58 void usage(const char *err)
59 {
60 usagef("%s", err);
61 }
62
63 void die(const char *err, ...)
64 {
65 va_list params;
66
67 va_start(params, err);
68 die_routine(err, params);
69 va_end(params);
70 }
71
72 void die_errno(const char *fmt, ...)
73 {
74 va_list params;
75 char fmt_with_err[1024];
76 char str_error[256], *err;
77 int i, j;
78
79 err = strerror(errno);
80 for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
81 if ((str_error[j++] = err[i++]) != '%')
82 continue;
83 if (j < sizeof(str_error) - 1) {
84 str_error[j++] = '%';
85 } else {
86 /* No room to double the '%', so we overwrite it with
87 * '\0' below */
88 j--;
89 break;
90 }
91 }
92 str_error[j] = 0;
93 snprintf(fmt_with_err, sizeof(fmt_with_err), "%s: %s", fmt, str_error);
94
95 va_start(params, fmt);
96 die_routine(fmt_with_err, params);
97 va_end(params);
98 }
99
100 int error(const char *err, ...)
101 {
102 va_list params;
103
104 va_start(params, err);
105 error_routine(err, params);
106 va_end(params);
107 return -1;
108 }
109
110 void warning(const char *warn, ...)
111 {
112 va_list params;
113
114 va_start(params, warn);
115 warn_routine(warn, params);
116 va_end(params);
117 }