src/errors.c

   1 /*
   2  * Copyright (C) 2009-2012 the libgit2 contributors
   3  *
   4  * This file is part of libgit2, distributed under the GNU GPL v2 with
   5  * a Linking Exception. For full terms see the included COPYING file.
   6  */
   7 #include "common.h"
   8 #include "global.h"
   9 #include "posix.h"
  10 #include "buffer.h"
  11 #include <stdarg.h>
  12
  13 /********************************************
  14  * New error handling
  15  ********************************************/
  16
  17 static git_error g_git_oom_error = {
  18         "Out of memory",
  19         GITERR_NOMEMORY
  20 };
  21
  22 static void set_error(int error_class, char *string)
  23 {
  24         git_error *error = &GIT_GLOBAL->error_t;
  25
  26         git__free(error->message);
  27
  28         error->message = string;
  29         error->klass = error_class;
  30
  31         GIT_GLOBAL->last_error = error;
  32 }
  33
  34 void giterr_set_oom(void)
  35 {
  36         GIT_GLOBAL->last_error = &g_git_oom_error;
  37 }
  38
  39 void giterr_set(int error_class, const char *string, ...)
  40 {
  41         git_buf buf = GIT_BUF_INIT;
  42         va_list arglist;
  43
  44         int unix_error_code = 0;
  45
  46 #ifdef GIT_WIN32
  47         DWORD win32_error_code = 0;
  48 #endif
  49
  50         if (error_class == GITERR_OS) {
  51                 unix_error_code = errno;
  52                 errno = 0;
  53
  54 #ifdef GIT_WIN32
  55                 win32_error_code = GetLastError();
  56                 SetLastError(0);
  57 #endif
  58         }
  59
  60         va_start(arglist, string);
  61         git_buf_vprintf(&buf, string, arglist);
  62         va_end(arglist);
  63
  64         /* automatically suffix strerror(errno) for GITERR_OS errors */
  65         if (error_class == GITERR_OS) {
  66
  67                 if (unix_error_code != 0) {
  68                         git_buf_PUTS(&buf, ": ");
  69                         git_buf_puts(&buf, strerror(unix_error_code));
  70                 }
  71
  72 #ifdef GIT_WIN32
  73                 else if (win32_error_code != 0) {
  74                         LPVOID lpMsgBuf = NULL;
  75
  76                         FormatMessage(
  77                                 FORMAT_MESSAGE_ALLOCATE_BUFFER |
  78                                 FORMAT_MESSAGE_FROM_SYSTEM |
  79                                 FORMAT_MESSAGE_IGNORE_INSERTS,
  80                                 NULL, win32_error_code, 0, (LPTSTR) &lpMsgBuf, 0, NULL);
  81
  82                         if (lpMsgBuf) {
  83                                 git_buf_PUTS(&buf, ": ");
  84                                 git_buf_puts(&buf, lpMsgBuf);
  85                                 LocalFree(lpMsgBuf);
  86                         }
  87                 }
  88 #endif
  89         }
  90
  91         if (!git_buf_oom(&buf))
  92                 set_error(error_class, git_buf_detach(&buf));
  93 }
  94
  95 void giterr_set_str(int error_class, const char *string)
  96 {
  97         char *message = git__strdup(string);
  98
  99         if (message)
 100                 set_error(error_class, message);
 101 }
 102
 103 void giterr_set_regex(const regex_t *regex, int error_code)
 104 {
 105         char error_buf[1024];
 106         regerror(error_code, regex, error_buf, sizeof(error_buf));
 107         giterr_set_str(GITERR_REGEX, error_buf);
 108 }
 109
 110 void giterr_clear(void)
 111 {
 112         GIT_GLOBAL->last_error = NULL;
 113 }
 114
 115 const git_error *giterr_last(void)
 116 {
 117         return GIT_GLOBAL->last_error;
 118 }
 119