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         fputs(prefix, stderr);
  11         vfprintf(stderr, err, params);
  12         fputs("\n", stderr);
  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
  33 /* If we are in a dlopen()ed .so write to a global variable would segfault
  34  * (ugh), so keep things static. */
  35 static void (*usage_routine)(const char *err) NORETURN = usage_builtin;
  36 static void (*die_routine)(const char *err, va_list params) NORETURN = die_builtin;
  37 static void (*error_routine)(const char *err, va_list params) = error_builtin;
  38
  39 void set_usage_routine(void (*routine)(const char *err) NORETURN)
  40 {
  41         usage_routine = routine;
  42 }
  43
  44 void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN)
  45 {
  46         die_routine = routine;
  47 }
  48
  49 void set_error_routine(void (*routine)(const char *err, va_list params))
  50 {
  51         error_routine = routine;
  52 }
  53
  54
  55 void usage(const char *err)
  56 {
  57         usage_routine(err);
  58 }
  59
  60 void die(const char *err, ...)
  61 {
  62         va_list params;
  63
  64         va_start(params, err);
  65         die_routine(err, params);
  66         va_end(params);
  67 }
  68
  69 int error(const char *err, ...)
  70 {
  71         va_list params;
  72
  73         va_start(params, err);
  74         error_routine(err, params);
  75         va_end(params);
  76         return -1;
  77 }