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[256];
  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_usage_routine(void (*routine)(const char *err) NORETURN)
  45 {
  46         usage_routine = routine;
  47 }
  48
  49 void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN)
  50 {
  51         die_routine = routine;
  52 }
  53
  54 void set_error_routine(void (*routine)(const char *err, va_list params))
  55 {
  56         error_routine = routine;
  57 }
  58
  59 void set_warn_routine(void (*routine)(const char *warn, va_list params))
  60 {
  61         warn_routine = routine;
  62 }
  63
  64
  65 void usage(const char *err)
  66 {
  67         usage_routine(err);
  68 }
  69
  70 void die(const char *err, ...)
  71 {
  72         va_list params;
  73
  74         va_start(params, err);
  75         die_routine(err, params);
  76         va_end(params);
  77 }
  78
  79 int error(const char *err, ...)
  80 {
  81         va_list params;
  82
  83         va_start(params, err);
  84         error_routine(err, params);
  85         va_end(params);
  86         return -1;
  87 }
  88
  89 void warning(const char *warn, ...)
  90 {
  91         va_list params;
  92
  93         va_start(params, warn);
  94         warn_routine(warn, params);
  95         va_end(params);
  96 }