tools/perf/util/usage.c

   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 }