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 static FILE *error_handle;
  10
  11 void vreportf(const char *prefix, const char *err, va_list params)
  12 {
  13         char msg[4096];
  14         FILE *fh = error_handle ? error_handle : stderr;
  15         char *p;
  16
  17         vsnprintf(msg, sizeof(msg), err, params);
  18         for (p = msg; *p; p++) {
  19                 if (iscntrl(*p) && *p != '\t' && *p != '\n')
  20                         *p = '?';
  21         }
  22         fprintf(fh, "%s%s\n", prefix, msg);
  23 }
  24
  25 static NORETURN void usage_builtin(const char *err, va_list params)
  26 {
  27         vreportf("usage: ", err, params);
  28         exit(129);
  29 }
  30
  31 static NORETURN void die_builtin(const char *err, va_list params)
  32 {
  33         vreportf("fatal: ", err, params);
  34         exit(128);
  35 }
  36
  37 static void error_builtin(const char *err, va_list params)
  38 {
  39         vreportf("error: ", err, params);
  40 }
  41
  42 static void warn_builtin(const char *warn, va_list params)
  43 {
  44         vreportf("warning: ", warn, params);
  45 }
  46
  47 static int die_is_recursing_builtin(void)
  48 {
  49         static int dying;
  50         return dying++;
  51 }
  52
  53 /* If we are in a dlopen()ed .so write to a global variable would segfault
  54  * (ugh), so keep things static. */
  55 static NORETURN_PTR void (*usage_routine)(const char *err, va_list params) = usage_builtin;
  56 static NORETURN_PTR void (*die_routine)(const char *err, va_list params) = die_builtin;
  57 static void (*error_routine)(const char *err, va_list params) = error_builtin;
  58 static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
  59 static int (*die_is_recursing)(void) = die_is_recursing_builtin;
  60
  61 void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params))
  62 {
  63         die_routine = routine;
  64 }
  65
  66 void set_error_routine(void (*routine)(const char *err, va_list params))
  67 {
  68         error_routine = routine;
  69 }
  70
  71 void (*get_error_routine(void))(const char *err, va_list params)
  72 {
  73         return error_routine;
  74 }
  75
  76 void set_warn_routine(void (*routine)(const char *warn, va_list params))
  77 {
  78         warn_routine = routine;
  79 }
  80
  81 void (*get_warn_routine(void))(const char *warn, va_list params)
  82 {
  83         return warn_routine;
  84 }
  85
  86 void set_die_is_recursing_routine(int (*routine)(void))
  87 {
  88         die_is_recursing = routine;
  89 }
  90
  91 void set_error_handle(FILE *fh)
  92 {
  93         error_handle = fh;
  94 }
  95
  96 void NORETURN usagef(const char *err, ...)
  97 {
  98         va_list params;
  99
 100         va_start(params, err);
 101         usage_routine(err, params);
 102         va_end(params);
 103 }
 104
 105 void NORETURN usage(const char *err)
 106 {
 107         usagef("%s", err);
 108 }
 109
 110 void NORETURN die(const char *err, ...)
 111 {
 112         va_list params;
 113
 114         if (die_is_recursing()) {
 115                 fputs("fatal: recursion detected in die handler\n", stderr);
 116                 exit(128);
 117         }
 118
 119         va_start(params, err);
 120         die_routine(err, params);
 121         va_end(params);
 122 }
 123
 124 static const char *fmt_with_err(char *buf, int n, const char *fmt)
 125 {
 126         char str_error[256], *err;
 127         int i, j;
 128
 129         err = strerror(errno);
 130         for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
 131                 if ((str_error[j++] = err[i++]) != '%')
 132                         continue;
 133                 if (j < sizeof(str_error) - 1) {
 134                         str_error[j++] = '%';
 135                 } else {
 136                         /* No room to double the '%', so we overwrite it with
 137                          * '\0' below */
 138                         j--;
 139                         break;
 140                 }
 141         }
 142         str_error[j] = 0;
 143         snprintf(buf, n, "%s: %s", fmt, str_error);
 144         return buf;
 145 }
 146
 147 void NORETURN die_errno(const char *fmt, ...)
 148 {
 149         char buf[1024];
 150         va_list params;
 151
 152         if (die_is_recursing()) {
 153                 fputs("fatal: recursion detected in die_errno handler\n",
 154                         stderr);
 155                 exit(128);
 156         }
 157
 158         va_start(params, fmt);
 159         die_routine(fmt_with_err(buf, sizeof(buf), fmt), params);
 160         va_end(params);
 161 }
 162
 163 #undef error_errno
 164 int error_errno(const char *fmt, ...)
 165 {
 166         char buf[1024];
 167         va_list params;
 168
 169         va_start(params, fmt);
 170         error_routine(fmt_with_err(buf, sizeof(buf), fmt), params);
 171         va_end(params);
 172         return -1;
 173 }
 174
 175 #undef error
 176 int error(const char *err, ...)
 177 {
 178         va_list params;
 179
 180         va_start(params, err);
 181         error_routine(err, params);
 182         va_end(params);
 183         return -1;
 184 }
 185
 186 void warning_errno(const char *warn, ...)
 187 {
 188         char buf[1024];
 189         va_list params;
 190
 191         va_start(params, warn);
 192         warn_routine(fmt_with_err(buf, sizeof(buf), warn), params);
 193         va_end(params);
 194 }
 195
 196 void warning(const char *warn, ...)
 197 {
 198         va_list params;
 199
 200         va_start(params, warn);
 201         warn_routine(warn, params);
 202         va_end(params);
 203 }