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1.1 root 1: /* $Source: /src386/usr/bin/pax/warn.c,v $
2: *
3: * $Revision: 1.1 $
4: *
5: * warn.c - miscellaneous user warning routines
6: *
7: * DESCRIPTION
8: *
9: * These routines provide the user with various forms of warning
10: * and informational messages.
11: *
12: * AUTHOR
13: *
14: * Mark H. Colburn, NAPS International ([email protected])
15: *
16: * Sponsored by The USENIX Association for public distribution.
17: *
18: * Copyright (c) 1989 Mark H. Colburn.
19: * All rights reserved.
20: *
21: * Redistribution and use in source and binary forms are permitted
22: * provided that the above copyright notice is duplicated in all such
23: * forms and that any documentation, advertising materials, and other
24: * materials related to such distribution and use acknowledge that the
25: * software was developed * by Mark H. Colburn and sponsored by The
26: * USENIX Association.
27: *
28: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
29: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
30: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
31: *
32: * $Log: warn.c,v $
33: * Revision 1.1 92/08/28 08:03:14 bin
34: * Initial revision
35: *
36: * Revision 1.1 89/02/14 16:48:51 jep
37: * Initial revision
38: *
39: * Revision 1.1 88/12/23 18:02:40 mark
40: * Initial revision
41: *
42: */
43:
44: #ifndef lint
45: static char *ident = "$Id: warn.c,v 1.1 92/08/28 08:03:14 bin Exp Locker: bin $";
46: static char *copyright = "Copyright (c) 1989 Mark H. Colburn.\nAll rights reserved.\n";
47: #endif /* ! lint */
48:
49:
50: /* Headers */
51:
52: #include "pax.h"
53:
54:
55: /* Function Prototypes */
56:
57: #if __STDC__
58:
59: static void prsize(FILE *, OFFSET);
60:
61: #else /* !__STDC__ */
62:
63: static void prsize();
64:
65: #endif /* __STDC__ */
66:
67:
68: /* warnarch - print an archive-related warning message and offset
69: *
70: * DESCRIPTION
71: *
72: * Present the user with an error message and an archive offset at
73: * which the error occured. This can be useful for diagnosing or
74: * fixing damaged archives.
75: *
76: * PARAMETERS
77: *
78: * char *msg - A message string to be printed for the user.
79: * OFFSET adjust - An adjustment which is added to the current
80: * archive position to tell the user exactly where
81: * the error occurred.
82: */
83:
84: #if __STDC__
85:
86: void warnarch(char *msg, OFFSET adjust)
87:
88: #else
89:
90: void warnarch(msg, adjust)
91: char *msg;
92: OFFSET adjust;
93:
94: #endif
95: {
96: fprintf(stderr, "%s: [offset ", myname);
97: prsize(stderr, total - adjust);
98: fprintf(stderr, "]: %s\n", msg);
99: }
100:
101:
102: /* strerror - return pointer to appropriate system error message
103: *
104: * DESCRIPTION
105: *
106: * Get an error message string which is appropriate for the setting
107: * of the errno variable.
108: *
109: * RETURNS
110: *
111: * Returns a pointer to a string which has an appropriate error
112: * message for the present value of errno. The error message
113: * strings are taken from sys_errlist[] where appropriate. If an
114: * appropriate message is not available in sys_errlist, then a
115: * pointer to the string "Unknown error (errno <errvalue>)" is
116: * returned instead.
117: */
118:
119: #if __STDC__
120:
121: char *strerror(void)
122:
123: #else
124:
125: char *strerror()
126:
127: #endif
128: {
129: static char msg[40]; /* used for "Unknown error" messages */
130:
131: if (errno > 0 && errno < sys_nerr) {
132: return (sys_errlist[errno]);
133: }
134: sprintf(msg, "Unknown error (errno %d)", errno);
135: return (msg);
136: }
137:
138:
139: /* prsize - print a file offset on a file stream
140: *
141: * DESCRIPTION
142: *
143: * Prints a file offset to a specific file stream. The file offset is
144: * of the form "%dm+%dk+%d", where the number preceeding the "m" and
145: * the "k" stand for the number of Megabytes and the number of
146: * Kilobytes, respectivley, which have been processed so far.
147: *
148: * PARAMETERS
149: *
150: * FILE *stream - Stream which is to be used for output
151: * OFFSET size - Current archive position to be printed on the output
152: * stream in the form: "%dm+%dk+%d".
153: *
154: */
155:
156: #if __STDC__
157:
158: static void prsize(FILE *stream, OFFSET size)
159:
160: #else
161:
162: static void prsize(stream, size)
163: FILE *stream; /* stream which is used for output */
164: OFFSET size; /* current archive position to be printed */
165:
166: #endif
167:
168: {
169: OFFSET n;
170:
171: if (n = (size / (1024L * 1024L))) {
172: fprintf(stream, "%ldm+", n);
173: size -= n * 1024L * 1024L;
174: }
175: if (n = (size / 1024L)) {
176: fprintf(stream, "%ldk+", n);
177: size -= n * 1024L;
178: }
179: fprintf(stream, "%ld", size);
180: }
181:
182:
183: /* fatal - print fatal message and exit
184: *
185: * DESCRIPTION
186: *
187: * Fatal prints the program's name along with an error message, then
188: * exits the program with a non-zero return code.
189: *
190: * PARAMETERS
191: *
192: * char *why - description of reason for termination
193: *
194: * RETURNS
195: *
196: * Returns an exit code of 1 to the parent process.
197: */
198:
199: #if __STDC__
200:
201: void fatal(char *why)
202:
203: #else
204:
205: void fatal(why)
206: char *why; /* description of reason for termination */
207:
208: #endif
209: {
210: fprintf(stderr, "%s: %s\n", myname, why);
211: exit(1);
212: }
213:
214:
215:
216: /* warn - print a warning message
217: *
218: * DESCRIPTION
219: *
220: * Print an error message listing the program name, the actual error
221: * which occurred and an informational message as to why the error
222: * occurred on the standard error device. The standard error is
223: * flushed after the error is printed to assure that the user gets
224: * the message in a timely fasion.
225: *
226: * PARAMETERS
227: *
228: * char *what - Pointer to string describing what failed.
229: * char *why - Pointer to string describing why did it failed.
230: */
231:
232: #if __STDC__
233:
234: void warn(char *what, char *why)
235:
236: #else
237:
238: void warn(what, why)
239: char *what; /* message as to what the error was */
240: char *why; /* explanation why the error occurred */
241:
242: #endif
243: {
244: fprintf(stderr, "%s: %s : %s\n", myname, what, why);
245: fflush(stderr);
246: }
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