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Linux/tools/perf/util/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 {
 60         va_list params;
 61 
 62         va_start(params, err);
 63         die_routine(err, params);
 64         va_end(params);
 65 }
 66 
 67 int error(const char *err, ...)
 68 {
 69         va_list params;
 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 {
 79         va_list params;
 80 
 81         va_start(params, warn);
 82         warn_routine(warn, params);
 83         va_end(params);
 84 }
 85 

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