b6aea45280bf2aa4c06a0130f912a61377165016
[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 char msg[1024];
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)
16 {
17 fprintf(stderr, "usage: %s\n", err);
18 exit(129);
19 }
20
21 static NORETURN void die_builtin(const char *err, va_list params)
22 {
23 report("fatal: ", err, params);
24 exit(128);
25 }
26
27 static void error_builtin(const char *err, va_list params)
28 {
29 report("error: ", err, params);
30 }
31
32 static void warn_builtin(const char *warn, va_list params)
33 {
34 report("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 void (*usage_routine)(const char *err) NORETURN = usage_builtin;
40 static void (*die_routine)(const char *err, va_list params) NORETURN = 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(void (*routine)(const char *err, va_list params) NORETURN)
45 {
46 die_routine = routine;
47 }
48
49 void usage(const char *err)
50 {
51 usage_routine(err);
52 }
53
54 void die(const char *err, ...)
55 {
56 va_list params;
57
58 va_start(params, err);
59 die_routine(err, params);
60 va_end(params);
61 }
62
63 void die_errno(const char *fmt, ...)
64 {
65 va_list params;
66 char fmt_with_err[1024];
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);
85
86 va_start(params, fmt);
87 die_routine(fmt_with_err, params);
88 va_end(params);
89 }
90
91 int error(const char *err, ...)
92 {
93 va_list params;
94
95 va_start(params, err);
96 error_routine(err, params);
97 va_end(params);
98 return -1;
99 }
100
101 void warning(const char *warn, ...)
102 {
103 va_list params;
104
105 va_start(params, warn);
106 warn_routine(warn, params);
107 va_end(params);
108 }