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 #include "cache.h"
   8
   9 void vreportf(const char *prefix, const char *err, va_list params)
  10 {
  11         char msg[4096];
  12         vsnprintf(msg, sizeof(msg), err, params);
  13         fprintf(stderr, "%s%s\n", prefix, msg);
  14 }
  15
  16 void vwritef(int fd, const char *prefix, const char *err, va_list params)
  17 {
  18         char msg[4096];
  19         int len = vsnprintf(msg, sizeof(msg), err, params);
  20         if (len > sizeof(msg))
  21                 len = sizeof(msg);
  22
  23         write_in_full(fd, prefix, strlen(prefix));
  24         write_in_full(fd, msg, len);
  25         write_in_full(fd, "\n", 1);
  26 }
  27
  28 static NORETURN void usage_builtin(const char *err, va_list params)
  29 {
  30         vreportf("usage: ", err, params);
  31         exit(129);
  32 }
  33
  34 static NORETURN void die_builtin(const char *err, va_list params)
  35 {
  36         vreportf("fatal: ", err, params);
  37         exit(128);
  38 }
  39
  40 static void error_builtin(const char *err, va_list params)
  41 {
  42         vreportf("error: ", err, params);
  43 }
  44
  45 static void warn_builtin(const char *warn, va_list params)
  46 {
  47         vreportf("warning: ", warn, params);
  48 }
  49
  50 /* If we are in a dlopen()ed .so write to a global variable would segfault
  51  * (ugh), so keep things static. */
  52 static NORETURN_PTR void (*usage_routine)(const char *err, va_list params) = usage_builtin;
  53 static NORETURN_PTR void (*die_routine)(const char *err, va_list params) = die_builtin;
  54 static void (*error_routine)(const char *err, va_list params) = error_builtin;
  55 static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
  56
  57 void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params))
  58 {
  59         die_routine = routine;
  60 }
  61
  62 void set_error_routine(void (*routine)(const char *err, va_list params))
  63 {
  64         error_routine = routine;
  65 }
  66
  67 void NORETURN usagef(const char *err, ...)
  68 {
  69         va_list params;
  70
  71         va_start(params, err);
  72         usage_routine(err, params);
  73         va_end(params);
  74 }
  75
  76 void NORETURN usage(const char *err)
  77 {
  78         usagef("%s", err);
  79 }
  80
  81 void NORETURN die(const char *err, ...)
  82 {
  83         va_list params;
  84
  85         va_start(params, err);
  86         die_routine(err, params);
  87         va_end(params);
  88 }
  89
  90 void NORETURN die_errno(const char *fmt, ...)
  91 {
  92         va_list params;
  93         char fmt_with_err[1024];
  94         char str_error[256], *err;
  95         int i, j;
  96
  97         err = strerror(errno);
  98         for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
  99                 if ((str_error[j++] = err[i++]) != '%')
 100                         continue;
 101                 if (j < sizeof(str_error) - 1) {
 102                         str_error[j++] = '%';
 103                 } else {
 104                         /* No room to double the '%', so we overwrite it with
 105                          * '\0' below */
 106                         j--;
 107                         break;
 108                 }
 109         }
 110         str_error[j] = 0;
 111         snprintf(fmt_with_err, sizeof(fmt_with_err), "%s: %s", fmt, str_error);
 112
 113         va_start(params, fmt);
 114         die_routine(fmt_with_err, params);
 115         va_end(params);
 116 }
 117
 118 int error(const char *err, ...)
 119 {
 120         va_list params;
 121
 122         va_start(params, err);
 123         error_routine(err, params);
 124         va_end(params);
 125         return -1;
 126 }
 127
 128 void warning(const char *warn, ...)
 129 {
 130         va_list params;
 131
 132         va_start(params, warn);
 133         warn_routine(warn, params);
 134         va_end(params);
 135 }