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