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1 /* error.c -- error handler for noninteractive utilities |
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2 Copyright (C) 1990, 91, 92, 93, 94, 95 Free Software Foundation, Inc. |
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3 |
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4 This program is free software; you can redistribute it and/or modify |
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5 it under the terms of the GNU General Public License as published by |
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6 the Free Software Foundation; either version 2, or (at your option) |
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7 any later version. |
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8 |
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9 This program is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU General Public License |
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15 along with this program; if not, write to the Free Software |
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16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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17 |
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18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ |
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19 |
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20 #ifdef HAVE_CONFIG_H |
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21 #include <config.h> |
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22 #endif |
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23 |
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24 #include <stdio.h> |
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25 |
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26 #if HAVE_VPRINTF || HAVE_DOPRNT || _LIBC |
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27 # if __STDC__ |
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28 # include <stdarg.h> |
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29 # define VA_START(args, lastarg) va_start(args, lastarg) |
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30 # else |
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31 # include <varargs.h> |
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32 # define VA_START(args, lastarg) va_start(args) |
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33 # endif |
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34 #else |
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35 # define va_alist a1, a2, a3, a4, a5, a6, a7, a8 |
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36 # define va_dcl char *a1, *a2, *a3, *a4, *a5, *a6, *a7, *a8; |
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37 #endif |
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38 |
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39 #if STDC_HEADERS || _LIBC |
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40 # include <stdlib.h> |
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41 # include <string.h> |
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42 #else |
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43 void exit (); |
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44 #endif |
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45 |
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46 /* This variable is incremented each time `error' is called. */ |
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47 unsigned int error_message_count; |
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48 |
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49 /* If NULL, error will flush stdout, then print on stderr the program |
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50 name, a colon and a space. Otherwise, error will call this |
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51 function without parameters instead. */ |
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52 void (*error_print_progname) () = NULL; |
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53 |
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54 #ifdef _LIBC |
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55 #define program_name program_invocation_name |
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56 #endif |
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57 |
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58 /* The calling program should define program_name and set it to the |
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59 name of the executing program. */ |
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60 extern char *program_name; |
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61 |
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62 #if HAVE_STRERROR || _LIBC |
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63 # ifndef strerror /* On some systems, strerror is a macro */ |
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64 char *strerror (); |
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65 # endif |
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66 #else |
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67 static char * |
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68 private_strerror (errnum) |
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69 int errnum; |
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70 { |
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71 extern char *sys_errlist[]; |
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72 extern int sys_nerr; |
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73 |
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74 if (errnum > 0 && errnum <= sys_nerr) |
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75 return sys_errlist[errnum]; |
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76 return "Unknown system error"; |
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77 } |
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78 #define strerror private_strerror |
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79 #endif |
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80 |
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81 /* Print the program name and error message MESSAGE, which is a printf-style |
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82 format string with optional args. |
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83 If ERRNUM is nonzero, print its corresponding system error message. |
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84 Exit with status STATUS if it is nonzero. */ |
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85 /* VARARGS */ |
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86 |
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87 void |
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88 #if defined(VA_START) && __STDC__ |
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89 error (int status, int errnum, const char *message, ...) |
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90 #else |
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91 error (status, errnum, message, va_alist) |
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92 int status; |
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93 int errnum; |
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94 char *message; |
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95 va_dcl |
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96 #endif |
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97 { |
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98 #ifdef VA_START |
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99 va_list args; |
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100 #endif |
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101 |
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102 if (error_print_progname) |
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103 (*error_print_progname) (); |
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104 else |
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105 { |
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106 fflush (stdout); |
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107 fprintf (stderr, "%s: ", program_name); |
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108 } |
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109 |
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110 #ifdef VA_START |
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111 VA_START (args, message); |
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112 # if HAVE_VPRINTF || _LIBC |
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113 vfprintf (stderr, message, args); |
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114 # else |
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115 _doprnt (message, args, stderr); |
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116 # endif |
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117 va_end (args); |
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118 #else |
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119 fprintf (stderr, message, a1, a2, a3, a4, a5, a6, a7, a8); |
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120 #endif |
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121 |
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122 ++error_message_count; |
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123 |
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124 if (errnum) |
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125 fprintf (stderr, ": %s", strerror (errnum)); |
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126 putc ('\n', stderr); |
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127 fflush (stderr); |
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128 if (status) |
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129 exit (status); |
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130 } |
