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3eb9473e | 1 | /*++\r |
2 | \r | |
4b1e1121 HT |
3 | Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>\r |
4 | This program and the accompanying materials \r | |
3eb9473e | 5 | are licensed and made available under the terms and conditions of the BSD License \r |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | Exceptions.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | Exception logging routines.\r | |
19 | \r | |
20 | --*/\r | |
21 | \r | |
22 | #include <stdio.h>\r | |
23 | #include <stdlib.h>\r | |
24 | #include <string.h> // for memset()\r | |
25 | #include "Exceptions.h"\r | |
26 | \r | |
27 | //\r | |
28 | // Max length of a saved exception message\r | |
29 | //\r | |
30 | #define MAX_EXCEPTION_MSG 200\r | |
31 | \r | |
32 | //\r | |
33 | // We use this structure to track exceptions thrown. We nest deeper on\r | |
34 | // TryException() calls, and come back out on CatchException() calls.\r | |
35 | // We save off the first exception message for a given exception level,\r | |
36 | // but we save the count of how many were thrown.\r | |
37 | //\r | |
38 | typedef struct {\r | |
39 | int ExceptionCount;\r | |
40 | char ExceptionMsg[MAX_EXCEPTION_MSG];\r | |
41 | } EXCEPTION_LOG;\r | |
42 | \r | |
43 | static EXCEPTION_LOG ExceptionLog[MAX_EXCEPTION_NESTING + 1];\r | |
44 | static int ExceptionLevel;\r | |
45 | \r | |
46 | //\r | |
47 | // Initialize our data and structures for tracking exceptions.\r | |
48 | //\r | |
49 | int\r | |
50 | InitExceptions (\r | |
51 | VOID\r | |
52 | )\r | |
53 | {\r | |
54 | ExceptionLevel = -1;\r | |
55 | memset ((char *) &ExceptionLog, 0, sizeof (ExceptionLog));\r | |
56 | return 0;\r | |
57 | }\r | |
58 | //\r | |
59 | // This function replaces the _try() exception macro. It sets the\r | |
60 | // nesting level.\r | |
61 | //\r | |
62 | int\r | |
63 | TryException (\r | |
64 | VOID\r | |
65 | )\r | |
66 | {\r | |
67 | //\r | |
68 | // Boost our exception level if we would not go out of range\r | |
69 | //\r | |
70 | ExceptionLevel++;\r | |
71 | if (ExceptionLevel >= MAX_EXCEPTION_NESTING) {\r | |
72 | fprintf (stderr, "ERROR: Max exception nesting level exceeded\n");\r | |
73 | ExceptionLevel--;\r | |
74 | return 1;\r | |
75 | }\r | |
76 | \r | |
77 | return 0;\r | |
78 | }\r | |
79 | //\r | |
80 | // This function replaces the _catch() exception macro. It's used to decrement\r | |
81 | // the nesting level and return any exeption error messages that were\r | |
82 | // thrown at the current nesting level.\r | |
83 | //\r | |
84 | char *\r | |
85 | CatchException (\r | |
86 | VOID\r | |
87 | )\r | |
88 | {\r | |
89 | //\r | |
90 | // Return a pointer to exception message. NULL if no exceptions at this level\r | |
91 | //\r | |
92 | if (ExceptionLevel >= 0) {\r | |
93 | ExceptionLevel--;\r | |
94 | if (ExceptionLog[ExceptionLevel + 1].ExceptionMsg[0]) {\r | |
95 | return ExceptionLog[ExceptionLevel + 1].ExceptionMsg;\r | |
96 | } else {\r | |
97 | return NULL;\r | |
98 | }\r | |
99 | } else {\r | |
100 | fprintf (stderr, "ERROR: Invalid nesting level call to CatchException()\n");\r | |
101 | return NULL;\r | |
102 | }\r | |
103 | }\r | |
104 | //\r | |
105 | // This function can be used to test for exceptions between the TryException()\r | |
106 | // and CatchException() calls in a given function.\r | |
107 | //\r | |
108 | int\r | |
109 | ExceptionThrown (\r | |
110 | VOID\r | |
111 | )\r | |
112 | {\r | |
113 | return ExceptionLog[ExceptionLevel].ExceptionCount;\r | |
114 | }\r | |
115 | //\r | |
116 | // This function replaces the _throw() exception macro. It saves off the\r | |
117 | // given error message at the current exeption level nesting.\r | |
118 | //\r | |
119 | int\r | |
120 | ThrowException (\r | |
121 | char *Msg\r | |
122 | )\r | |
123 | {\r | |
124 | if (ExceptionLevel < 0) {\r | |
125 | //\r | |
126 | // fprintf (stderr, "ERROR: Exception thrown out of scope");\r | |
127 | // Haven't yet enabled handling of exceptions, so just emit the message.\r | |
128 | //\r | |
129 | fprintf (stderr, Msg);\r | |
130 | return 1;\r | |
131 | }\r | |
132 | //\r | |
133 | // Only log the first\r | |
134 | //\r | |
135 | if (ExceptionLog[ExceptionLevel].ExceptionMsg[0] == 0) {\r | |
136 | strncpy (ExceptionLog[ExceptionLevel].ExceptionMsg, Msg, MAX_EXCEPTION_MSG);\r | |
137 | }\r | |
138 | \r | |
139 | ExceptionLog[ExceptionLevel].ExceptionCount++;\r | |
140 | return 0;\r | |
141 | }\r |