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[4096];
  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, va_list params)
  16 {
  17         report("usage: ", err, params);
  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 NORETURN_PTR void (*usage_routine)(const char *err, va_list params) = usage_builtin;
  40 static NORETURN_PTR void (*die_routine)(const char *err, va_list params) = 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_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params))
  45 {
  46         die_routine = routine;
  47 }
  48
  49 void usagef(const char *err, ...)
  50 {
  51         va_list params;
  52
  53         va_start(params, err);
  54         usage_routine(err, params);
  55         va_end(params);
  56 }
  57
  58 void usage(const char *err)
  59 {
  60         usagef("%s", err);
  61 }
  62
  63 void die(const char *err, ...)
  64 {
  65         va_list params;
  66
  67         va_start(params, err);
  68         die_routine(err, params);
  69         va_end(params);
  70 }
  71
  72 void die_errno(const char *fmt, ...)
  73 {
  74         va_list params;
  75         char fmt_with_err[1024];
  76         char str_error[256], *err;
  77         int i, j;
  78
  79         err = strerror(errno);
  80         for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
  81                 if ((str_error[j++] = err[i++]) != '%')
  82                         continue;
  83                 if (j < sizeof(str_error) - 1) {
  84                         str_error[j++] = '%';
  85                 } else {
  86                         /* No room to double the '%', so we overwrite it with
  87                          * '\0' below */
  88                         j--;
  89                         break;
  90                 }
  91         }
  92         str_error[j] = 0;
  93         snprintf(fmt_with_err, sizeof(fmt_with_err), "%s: %s", fmt, str_error);
  94
  95         va_start(params, fmt);
  96         die_routine(fmt_with_err, params);
  97         va_end(params);
  98 }
  99
 100 int error(const char *err, ...)
 101 {
 102         va_list params;
 103
 104         va_start(params, err);
 105         error_routine(err, params);
 106         va_end(params);
 107         return -1;
 108 }
 109
 110 void warning(const char *warn, ...)
 111 {
 112         va_list params;
 113
 114         va_start(params, warn);
 115         warn_routine(warn, params);
 116         va_end(params);
 117 }