Linux Kernel  3.7.1
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usage.c
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1 /*
2  * usage.c
3  *
4  * Various reporting routines.
5  * Originally copied from GIT source.
6  *
7  * Copyright (C) Linus Torvalds, 2005
8  */
9 #include "util.h"
10 #include "debug.h"
11 
12 static void report(const char *prefix, const char *err, va_list params)
13 {
14  char msg[1024];
15  vsnprintf(msg, sizeof(msg), err, params);
16  fprintf(stderr, " %s%s\n", prefix, msg);
17 }
18 
19 static NORETURN void usage_builtin(const char *err)
20 {
21  fprintf(stderr, "\n Usage: %s\n", err);
22  exit(129);
23 }
24 
25 static NORETURN void die_builtin(const char *err, va_list params)
26 {
27  report(" Fatal: ", err, params);
28  exit(128);
29 }
30 
31 static void error_builtin(const char *err, va_list params)
32 {
33  report(" Error: ", err, params);
34 }
35 
36 static void warn_builtin(const char *warn, va_list params)
37 {
38  report(" Warning: ", warn, params);
39 }
40 
41 /* If we are in a dlopen()ed .so write to a global variable would segfault
42  * (ugh), so keep things static. */
43 static void (*usage_routine)(const char *err) NORETURN = usage_builtin;
44 static void (*die_routine)(const char *err, va_list params) NORETURN = die_builtin;
45 static void (*error_routine)(const char *err, va_list params) = error_builtin;
46 static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
47 
48 void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN)
49 {
50  die_routine = routine;
51 }
52 
53 void usage(const char *err)
54 {
55  usage_routine(err);
56 }
57 
58 void die(const char *err, ...)
59 {
61 
62  va_start(params, err);
63  die_routine(err, params);
64  va_end(params);
65 }
66 
67 int error(const char *err, ...)
68 {
70 
71  va_start(params, err);
72  error_routine(err, params);
73  va_end(params);
74  return -1;
75 }
76 
77 void warning(const char *warn, ...)
78 {
80 
81  va_start(params, warn);
82  warn_routine(warn, params);
83  va_end(params);
84 }