| 1 | *DECK XERMSG |
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| 2 | SUBROUTINE XERMSG (LIBRAR, SUBROU, MESSG, NERR, LEVEL) |
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| 3 | IMPLICIT NONE |
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| 4 | C***BEGIN PROLOGUE XERMSG |
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| 5 | C***PURPOSE Process error messages for SLATEC and other libraries. |
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| 6 | C***LIBRARY SLATEC (XERROR) |
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| 7 | C***CATEGORY R3C |
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| 8 | C***TYPE ALL (XERMSG-A) |
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| 9 | C***KEYWORDS ERROR MESSAGE, XERROR |
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| 10 | C***AUTHOR Fong, Kirby, (NMFECC at LLNL) |
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| 11 | C***DESCRIPTION |
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| 12 | C |
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| 13 | C XERMSG processes a diagnostic message in a manner determined by the |
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| 14 | C value of LEVEL and the current value of the library error control |
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| 15 | C flag, KONTRL. See subroutine XSETF for details. |
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| 16 | C |
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| 17 | C LIBRAR A character constant (or character variable) with the name |
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| 18 | C of the library. This will be 'SLATEC' for the SLATEC |
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| 19 | C Common Math Library. The error handling package is |
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| 20 | C general enough to be used by many libraries |
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| 21 | C simultaneously, so it is desirable for the routine that |
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| 22 | C detects and reports an error to identify the library name |
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| 23 | C as well as the routine name. |
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| 24 | C |
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| 25 | C SUBROU A character constant (or character variable) with the name |
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| 26 | C of the routine that detected the error. Usually it is the |
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| 27 | C name of the routine that is calling XERMSG. There are |
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| 28 | C some instances where a user callable library routine calls |
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| 29 | C lower level subsidiary routines where the error is |
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| 30 | C detected. In such cases it may be more informative to |
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| 31 | C supply the name of the routine the user called rather than |
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| 32 | C the name of the subsidiary routine that detected the |
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| 33 | C error. |
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| 34 | C |
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| 35 | C MESSG A character constant (or character variable) with the text |
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| 36 | C of the error or warning message. In the example below, |
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| 37 | C the message is a character constant that contains a |
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| 38 | C generic message. |
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| 39 | C |
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| 40 | C CALL XERMSG ('SLATEC', 'MMPY', |
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| 41 | C *'THE ORDER OF THE MATRIX EXCEEDS THE ROW DIMENSION', |
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| 42 | C *3, 1) |
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| 43 | C |
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| 44 | C It is possible (and is sometimes desirable) to generate a |
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| 45 | C specific message--e.g., one that contains actual numeric |
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| 46 | C values. Specific numeric values can be converted into |
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| 47 | C character strings using formatted WRITE statements into |
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| 48 | C character variables. This is called standard Fortran |
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| 49 | C internal file I/O and is exemplified in the first three |
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| 50 | C lines of the following example. You can also catenate |
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| 51 | C substrings of characters to construct the error message. |
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| 52 | C Here is an example showing the use of both writing to |
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| 53 | C an internal file and catenating character strings. |
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| 54 | C |
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| 55 | C CHARACTER*5 CHARN, CHARL |
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| 56 | C WRITE (CHARN,10) N |
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| 57 | C WRITE (CHARL,10) LDA |
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| 58 | C 10 FORMAT(I5) |
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| 59 | C CALL XERMSG ('SLATEC', 'MMPY', 'THE ORDER'//CHARN// |
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| 60 | C * ' OF THE MATRIX EXCEEDS ITS ROW DIMENSION OF'// |
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| 61 | C * CHARL, 3, 1) |
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| 62 | C |
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| 63 | C There are two subtleties worth mentioning. One is that |
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| 64 | C the // for character catenation is used to construct the |
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| 65 | C error message so that no single character constant is |
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| 66 | C continued to the next line. This avoids confusion as to |
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| 67 | C whether there are trailing blanks at the end of the line. |
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| 68 | C The second is that by catenating the parts of the message |
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| 69 | C as an actual argument rather than encoding the entire |
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| 70 | C message into one large character variable, we avoid |
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| 71 | C having to know how long the message will be in order to |
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| 72 | C declare an adequate length for that large character |
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| 73 | C variable. XERMSG calls XERPRN to print the message using |
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| 74 | C multiple lines if necessary. If the message is very long, |
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| 75 | C XERPRN will break it into pieces of 72 characters (as |
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| 76 | C requested by XERMSG) for printing on multiple lines. |
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| 77 | C Also, XERMSG asks XERPRN to prefix each line with ' * ' |
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| 78 | C so that the total line length could be 76 characters. |
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| 79 | C Note also that XERPRN scans the error message backwards |
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| 80 | C to ignore trailing blanks. Another feature is that |
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| 81 | C the substring '$$' is treated as a new line sentinel |
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| 82 | C by XERPRN. If you want to construct a multiline |
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| 83 | C message without having to count out multiples of 72 |
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| 84 | C characters, just use '$$' as a separator. '$$' |
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| 85 | C obviously must occur within 72 characters of the |
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| 86 | C start of each line to have its intended effect since |
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| 87 | C XERPRN is asked to wrap around at 72 characters in |
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| 88 | C addition to looking for '$$'. |
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| 89 | C |
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| 90 | C NERR An integer value that is chosen by the library routine's |
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| 91 | C author. It must be in the range -99 to 999 (three |
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| 92 | C printable digits). Each distinct error should have its |
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| 93 | C own error number. These error numbers should be described |
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| 94 | C in the machine readable documentation for the routine. |
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| 95 | C The error numbers need be unique only within each routine, |
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| 96 | C so it is reasonable for each routine to start enumerating |
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| 97 | C errors from 1 and proceeding to the next integer. |
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| 98 | C |
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| 99 | C LEVEL An integer value in the range 0 to 2 that indicates the |
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| 100 | C level (severity) of the error. Their meanings are |
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| 101 | C |
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| 102 | C -1 A warning message. This is used if it is not clear |
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| 103 | C that there really is an error, but the user's attention |
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| 104 | C may be needed. An attempt is made to only print this |
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| 105 | C message once. |
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| 106 | C |
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| 107 | C 0 A warning message. This is used if it is not clear |
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| 108 | C that there really is an error, but the user's attention |
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| 109 | C may be needed. |
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| 110 | C |
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| 111 | C 1 A recoverable error. This is used even if the error is |
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| 112 | C so serious that the routine cannot return any useful |
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| 113 | C answer. If the user has told the error package to |
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| 114 | C return after recoverable errors, then XERMSG will |
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| 115 | C return to the Library routine which can then return to |
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| 116 | C the user's routine. The user may also permit the error |
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| 117 | C package to terminate the program upon encountering a |
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| 118 | C recoverable error. |
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| 119 | C |
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| 120 | C 2 A fatal error. XERMSG will not return to its caller |
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| 121 | C after it receives a fatal error. This level should |
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| 122 | C hardly ever be used; it is much better to allow the |
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| 123 | C user a chance to recover. An example of one of the few |
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| 124 | C cases in which it is permissible to declare a level 2 |
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| 125 | C error is a reverse communication Library routine that |
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| 126 | C is likely to be called repeatedly until it integrates |
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| 127 | C across some interval. If there is a serious error in |
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| 128 | C the input such that another step cannot be taken and |
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| 129 | C the Library routine is called again without the input |
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| 130 | C error having been corrected by the caller, the Library |
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| 131 | C routine will probably be called forever with improper |
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| 132 | C input. In this case, it is reasonable to declare the |
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| 133 | C error to be fatal. |
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| 134 | C |
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| 135 | C Each of the arguments to XERMSG is input; none will be modified by |
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| 136 | C XERMSG. A routine may make multiple calls to XERMSG with warning |
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| 137 | C level messages; however, after a call to XERMSG with a recoverable |
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| 138 | C error, the routine should return to the user. Do not try to call |
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| 139 | C XERMSG with a second recoverable error after the first recoverable |
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| 140 | C error because the error package saves the error number. The user |
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| 141 | C can retrieve this error number by calling another entry point in |
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| 142 | C the error handling package and then clear the error number when |
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| 143 | C recovering from the error. Calling XERMSG in succession causes the |
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| 144 | C old error number to be overwritten by the latest error number. |
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| 145 | C This is considered harmless for error numbers associated with |
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| 146 | C warning messages but must not be done for error numbers of serious |
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| 147 | C errors. After a call to XERMSG with a recoverable error, the user |
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| 148 | C must be given a chance to call NUMXER or XERCLR to retrieve or |
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| 149 | C clear the error number. |
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| 150 | C***REFERENCES R. E. Jones and D. K. Kahaner, XERROR, the SLATEC |
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| 151 | C Error-handling Package, SAND82-0800, Sandia |
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| 152 | C Laboratories, 1982. |
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| 153 | C***ROUTINES CALLED FDUMP, J4SAVE, XERCNT, XERHLT, XERPRN, XERSVE |
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| 154 | C***REVISION HISTORY (YYMMDD) |
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| 155 | C 880101 DATE WRITTEN |
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| 156 | C 880621 REVISED AS DIRECTED AT SLATEC CML MEETING OF FEBRUARY 1988. |
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| 157 | C THERE ARE TWO BASIC CHANGES. |
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| 158 | C 1. A NEW ROUTINE, XERPRN, IS USED INSTEAD OF XERPRT TO |
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| 159 | C PRINT MESSAGES. THIS ROUTINE WILL BREAK LONG MESSAGES |
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| 160 | C INTO PIECES FOR PRINTING ON MULTIPLE LINES. '$$' IS |
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| 161 | C ACCEPTED AS A NEW LINE SENTINEL. A PREFIX CAN BE |
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| 162 | C ADDED TO EACH LINE TO BE PRINTED. XERMSG USES EITHER |
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| 163 | C ' ***' OR ' * ' AND LONG MESSAGES ARE BROKEN EVERY |
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| 164 | C 72 CHARACTERS (AT MOST) SO THAT THE MAXIMUM LINE |
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| 165 | C LENGTH OUTPUT CAN NOW BE AS GREAT AS 76. |
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| 166 | C 2. THE TEXT OF ALL MESSAGES IS NOW IN UPPER CASE SINCE THE |
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| 167 | C FORTRAN STANDARD DOCUMENT DOES NOT ADMIT THE EXISTENCE |
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| 168 | C OF LOWER CASE. |
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| 169 | C 880708 REVISED AFTER THE SLATEC CML MEETING OF JUNE 29 AND 30. |
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| 170 | C THE PRINCIPAL CHANGES ARE |
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| 171 | C 1. CLARIFY COMMENTS IN THE PROLOGUES |
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| 172 | C 2. RENAME XRPRNT TO XERPRN |
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| 173 | C 3. REWORK HANDLING OF '$$' IN XERPRN TO HANDLE BLANK LINES |
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| 174 | C SIMILAR TO THE WAY FORMAT STATEMENTS HANDLE THE / |
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| 175 | C CHARACTER FOR NEW RECORDS. |
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| 176 | C 890706 REVISED WITH THE HELP OF FRED FRITSCH AND REG CLEMENS TO |
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| 177 | C CLEAN UP THE CODING. |
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| 178 | C 890721 REVISED TO USE NEW FEATURE IN XERPRN TO COUNT CHARACTERS IN |
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| 179 | C PREFIX. |
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| 180 | C 891013 REVISED TO CORRECT COMMENTS. |
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| 181 | C 891214 Prologue converted to Version 4.0 format. (WRB) |
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| 182 | C 900510 Changed test on NERR to be -9999999 < NERR < 99999999, but |
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| 183 | C NERR .ne. 0, and on LEVEL to be -2 < LEVEL < 3. Added |
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| 184 | C LEVEL=-1 logic, changed calls to XERSAV to XERSVE, and |
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| 185 | C XERCTL to XERCNT. (RWC) |
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| 186 | C 920501 Reformatted the REFERENCES section. (WRB) |
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| 187 | C***END PROLOGUE XERMSG |
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| 188 | CHARACTER*(*) LIBRAR, SUBROU, MESSG |
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| 189 | CHARACTER*8 XLIBR, XSUBR |
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| 190 | CHARACTER*72 TEMP |
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| 191 | CHARACTER*20 LFIRST |
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| 192 | INTEGER NERR, LEVEL, LKNTRL |
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| 193 | INTEGER J4SAVE, MAXMES, KDUMMY, I, KOUNT, LERR, LLEVEL |
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| 194 | INTEGER MKNTRL, LTEMP |
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| 195 | C***FIRST EXECUTABLE STATEMENT XERMSG |
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| 196 | LKNTRL = J4SAVE (2, 0, .FALSE.) |
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| 197 | MAXMES = J4SAVE (4, 0, .FALSE.) |
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| 198 | C |
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| 199 | C LKNTRL IS A LOCAL COPY OF THE CONTROL FLAG KONTRL. |
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| 200 | C MAXMES IS THE MAXIMUM NUMBER OF TIMES ANY PARTICULAR MESSAGE |
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| 201 | C SHOULD BE PRINTED. |
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| 202 | C |
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| 203 | C WE PRINT A FATAL ERROR MESSAGE AND TERMINATE FOR AN ERROR IN |
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| 204 | C CALLING XERMSG. THE ERROR NUMBER SHOULD BE POSITIVE, |
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| 205 | C AND THE LEVEL SHOULD BE BETWEEN 0 AND 2. |
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| 206 | C |
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| 207 | IF (NERR.LT.-9999999 .OR. NERR.GT.99999999 .OR. NERR.EQ.0 .OR. |
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| 208 | * LEVEL.LT.-1 .OR. LEVEL.GT.2) THEN |
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| 209 | CALL XERPRN (' ***', -1, 'FATAL ERROR IN...$$ ' // |
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| 210 | * 'XERMSG -- INVALID ERROR NUMBER OR LEVEL$$ '// |
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| 211 | * 'JOB ABORT DUE TO FATAL ERROR.', 72) |
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| 212 | CALL XERSVE (' ', ' ', ' ', 0, 0, 0, KDUMMY) |
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| 213 | CALL XERHLT (' ***XERMSG -- INVALID INPUT') |
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| 214 | RETURN |
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| 215 | ENDIF |
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| 216 | C |
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| 217 | C RECORD THE MESSAGE. |
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| 218 | C |
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| 219 | I = J4SAVE (1, NERR, .TRUE.) |
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| 220 | CALL XERSVE (LIBRAR, SUBROU, MESSG, 1, NERR, LEVEL, KOUNT) |
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| 221 | C |
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| 222 | C HANDLE PRINT-ONCE WARNING MESSAGES. |
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| 223 | C |
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| 224 | IF (LEVEL.EQ.-1 .AND. KOUNT.GT.1) RETURN |
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| 225 | C |
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| 226 | C ALLOW TEMPORARY USER OVERRIDE OF THE CONTROL FLAG. |
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| 227 | C |
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| 228 | XLIBR = LIBRAR |
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| 229 | XSUBR = SUBROU |
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| 230 | LFIRST = MESSG |
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| 231 | LERR = NERR |
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| 232 | LLEVEL = LEVEL |
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| 233 | CALL XERCNT (XLIBR, XSUBR, LFIRST, LERR, LLEVEL, LKNTRL) |
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| 234 | C |
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| 235 | LKNTRL = MAX(-2, MIN(2,LKNTRL)) |
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| 236 | MKNTRL = ABS(LKNTRL) |
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| 237 | C |
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| 238 | C SKIP PRINTING IF THE CONTROL FLAG VALUE AS RESET IN XERCNT IS |
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| 239 | C ZERO AND THE ERROR IS NOT FATAL. |
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| 240 | C |
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| 241 | IF (LEVEL.LT.2 .AND. LKNTRL.EQ.0) GO TO 30 |
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| 242 | IF (LEVEL.EQ.0 .AND. KOUNT.GT.MAXMES) GO TO 30 |
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| 243 | IF (LEVEL.EQ.1 .AND. KOUNT.GT.MAXMES .AND. MKNTRL.EQ.1) GO TO 30 |
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| 244 | IF (LEVEL.EQ.2 .AND. KOUNT.GT.MAX(1,MAXMES)) GO TO 30 |
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| 245 | C |
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| 246 | C ANNOUNCE THE NAMES OF THE LIBRARY AND SUBROUTINE BY BUILDING A |
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| 247 | C MESSAGE IN CHARACTER VARIABLE TEMP (NOT EXCEEDING 66 CHARACTERS) |
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| 248 | C AND SENDING IT OUT VIA XERPRN. PRINT ONLY IF CONTROL FLAG |
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| 249 | C IS NOT ZERO. |
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| 250 | C |
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| 251 | IF (LKNTRL .NE. 0) THEN |
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| 252 | TEMP(1:21) = 'MESSAGE FROM ROUTINE ' |
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| 253 | I = MIN(LEN(SUBROU), 16) |
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| 254 | TEMP(22:21+I) = SUBROU(1:I) |
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| 255 | TEMP(22+I:33+I) = ' IN LIBRARY ' |
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| 256 | LTEMP = 33 + I |
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| 257 | I = MIN(LEN(LIBRAR), 16) |
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| 258 | TEMP(LTEMP+1:LTEMP+I) = LIBRAR (1:I) |
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| 259 | TEMP(LTEMP+I+1:LTEMP+I+1) = '.' |
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| 260 | LTEMP = LTEMP + I + 1 |
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| 261 | CALL XERPRN (' ***', -1, TEMP(1:LTEMP), 72) |
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| 262 | ENDIF |
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| 263 | C |
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| 264 | C IF LKNTRL IS POSITIVE, PRINT AN INTRODUCTORY LINE BEFORE |
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| 265 | C PRINTING THE MESSAGE. THE INTRODUCTORY LINE TELLS THE CHOICE |
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| 266 | C FROM EACH OF THE FOLLOWING THREE OPTIONS. |
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| 267 | C 1. LEVEL OF THE MESSAGE |
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| 268 | C 'INFORMATIVE MESSAGE' |
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| 269 | C 'POTENTIALLY RECOVERABLE ERROR' |
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| 270 | C 'FATAL ERROR' |
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| 271 | C 2. WHETHER CONTROL FLAG WILL ALLOW PROGRAM TO CONTINUE |
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| 272 | C 'PROG CONTINUES' |
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| 273 | C 'PROG ABORTED' |
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| 274 | C 3. WHETHER OR NOT A TRACEBACK WAS REQUESTED. (THE TRACEBACK |
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| 275 | C MAY NOT BE IMPLEMENTED AT SOME SITES, SO THIS ONLY TELLS |
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| 276 | C WHAT WAS REQUESTED, NOT WHAT WAS DELIVERED.) |
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| 277 | C 'TRACEBACK REQUESTED' |
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| 278 | C 'TRACEBACK NOT REQUESTED' |
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| 279 | C NOTICE THAT THE LINE INCLUDING FOUR PREFIX CHARACTERS WILL NOT |
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| 280 | C EXCEED 74 CHARACTERS. |
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| 281 | C WE SKIP THE NEXT BLOCK IF THE INTRODUCTORY LINE IS NOT NEEDED. |
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| 282 | C |
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| 283 | IF (LKNTRL .GT. 0) THEN |
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| 284 | C |
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| 285 | C THE FIRST PART OF THE MESSAGE TELLS ABOUT THE LEVEL. |
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| 286 | C |
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| 287 | IF (LEVEL .LE. 0) THEN |
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| 288 | TEMP(1:20) = 'INFORMATIVE MESSAGE,' |
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| 289 | LTEMP = 20 |
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| 290 | ELSEIF (LEVEL .EQ. 1) THEN |
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| 291 | TEMP(1:30) = 'POTENTIALLY RECOVERABLE ERROR,' |
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| 292 | LTEMP = 30 |
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| 293 | ELSE |
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| 294 | TEMP(1:12) = 'FATAL ERROR,' |
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| 295 | LTEMP = 12 |
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| 296 | ENDIF |
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| 297 | C |
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| 298 | C THEN WHETHER THE PROGRAM WILL CONTINUE. |
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| 299 | C |
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| 300 | IF ((MKNTRL.EQ.2 .AND. LEVEL.GE.1) .OR. |
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| 301 | * (MKNTRL.EQ.1 .AND. LEVEL.EQ.2)) THEN |
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| 302 | TEMP(LTEMP+1:LTEMP+14) = ' PROG ABORTED,' |
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| 303 | LTEMP = LTEMP + 14 |
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| 304 | ELSE |
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| 305 | TEMP(LTEMP+1:LTEMP+16) = ' PROG CONTINUES,' |
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| 306 | LTEMP = LTEMP + 16 |
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| 307 | ENDIF |
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| 308 | C |
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| 309 | C FINALLY TELL WHETHER THERE SHOULD BE A TRACEBACK. |
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| 310 | C |
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| 311 | IF (LKNTRL .GT. 0) THEN |
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| 312 | TEMP(LTEMP+1:LTEMP+20) = ' TRACEBACK REQUESTED' |
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| 313 | LTEMP = LTEMP + 20 |
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| 314 | ELSE |
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| 315 | TEMP(LTEMP+1:LTEMP+24) = ' TRACEBACK NOT REQUESTED' |
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| 316 | LTEMP = LTEMP + 24 |
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| 317 | ENDIF |
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| 318 | CALL XERPRN (' ***', -1, TEMP(1:LTEMP), 72) |
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| 319 | ENDIF |
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| 320 | C |
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| 321 | C NOW SEND OUT THE MESSAGE. |
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| 322 | C |
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| 323 | CALL XERPRN (' * ', -1, MESSG, 72) |
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| 324 | C |
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| 325 | C IF LKNTRL IS POSITIVE, WRITE THE ERROR NUMBER AND REQUEST A |
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| 326 | C TRACEBACK. |
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| 327 | C |
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| 328 | IF (LKNTRL .GT. 0) THEN |
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| 329 | WRITE (TEMP, '(''ERROR NUMBER = '', I8)') NERR |
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| 330 | DO 10 I=16,22 |
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| 331 | IF (TEMP(I:I) .NE. ' ') GO TO 20 |
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| 332 | 10 CONTINUE |
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| 333 | C |
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| 334 | 20 CALL XERPRN (' * ', -1, TEMP(1:15) // TEMP(I:23), 72) |
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| 335 | CALL FDUMP |
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| 336 | ENDIF |
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| 337 | C |
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| 338 | C IF LKNTRL IS NOT ZERO, PRINT A BLANK LINE AND AN END OF MESSAGE. |
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| 339 | C |
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| 340 | IF (LKNTRL .NE. 0) THEN |
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| 341 | CALL XERPRN (' * ', -1, ' ', 72) |
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| 342 | CALL XERPRN (' ***', -1, 'END OF MESSAGE', 72) |
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| 343 | CALL XERPRN (' ', 0, ' ', 72) |
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| 344 | ENDIF |
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| 345 | C |
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| 346 | C IF THE ERROR IS NOT FATAL OR THE ERROR IS RECOVERABLE AND THE |
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| 347 | C CONTROL FLAG IS SET FOR RECOVERY, THEN RETURN. |
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| 348 | C |
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| 349 | 30 IF (LEVEL.LE.0 .OR. (LEVEL.EQ.1 .AND. MKNTRL.LE.1)) RETURN |
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| 350 | C |
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| 351 | C THE PROGRAM WILL BE STOPPED DUE TO AN UNRECOVERED ERROR OR A |
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| 352 | C FATAL ERROR. PRINT THE REASON FOR THE ABORT AND THE ERROR |
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| 353 | C SUMMARY IF THE CONTROL FLAG AND THE MAXIMUM ERROR COUNT PERMIT. |
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| 354 | C |
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| 355 | IF (LKNTRL.GT.0 .AND. KOUNT.LT.MAX(1,MAXMES)) THEN |
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| 356 | IF (LEVEL .EQ. 1) THEN |
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| 357 | CALL XERPRN |
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| 358 | * (' ***', -1, 'JOB ABORT DUE TO UNRECOVERED ERROR.', 72) |
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| 359 | ELSE |
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| 360 | CALL XERPRN(' ***', -1, 'JOB ABORT DUE TO FATAL ERROR.', 72) |
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| 361 | ENDIF |
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| 362 | CALL XERSVE (' ', ' ', ' ', -1, 0, 0, KDUMMY) |
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| 363 | CALL XERHLT (' ') |
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| 364 | ELSE |
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| 365 | CALL XERHLT (MESSG) |
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| 366 | ENDIF |
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| 367 | RETURN |
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| 368 | END |
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