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229a60e4d5
Changed calc_errno a global int variable so that is may be directly accessed by libcalc users. Further improve help files for help/errno, help/error, help/newerror, help/stoponerror and help/strerror by adding to documentation of the calc error code system as well as libcalc interface where applicable.
113 lines
3.2 KiB
Plaintext
113 lines
3.2 KiB
Plaintext
NAME
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strerror - returns a string describing an error value
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SYNOPSIS
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strerror([errnum])
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TYPES
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errnum integer
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return string
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DESCRIPTION
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If 0 <= errnum <= 32767 then strerror(errnum) will return one of:
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* system error and libc errno value related string
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* calc computation error code string
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* user-defined description string created by newerror(str)
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* "Unknown error errnum" (where errnum is in decimal)
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Without a argument, strerror() returns as if it were called with:
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strerror(errno())
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That is, the string associated with the "global calc_errno value"
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is returned.
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The term "global calc_errno value" is an internal calc state.
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This is NOT a calc variable called calc_errno.
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The system error and libc errno value related string may be
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different for different systems.
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For users of libcalc:
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The libcalc array error_table[] contains the hard coded
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calc-generated error array of E__COUNT+2 pointers to strings
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starting with E__BASE, ending with E__HIGHEST and terminated
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by a NULL pointer.
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The error_table[0] is for errnum of E__BASE, and is the
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string "No error".
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The error_table[E__COUNT] is string associated with the
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highest calc-generated error message.
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The error_table[E__COUNT+1] is a NULL pointer.
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See help error for more information on the ranges of errnum and
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the meaning of the above mentioned constants.
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EXAMPLE
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; errcount(0),; errmax(20),;
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; print errcount(), errmax()
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0 20
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; print strerror(2)
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No such file or directory
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; print errcount(), errmax()
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0 20
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; x = 3 / 0;
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; print errcount(), errmax()
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1 20
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; print strerror()
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Division by zero
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; a = newerror("alpha")
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; print errcount(), errmax()
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2 20
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; print strerror()
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alpha
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; print strerror(999)
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Unknown error: 999
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; print errcount(), errmax()
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2 20
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LIMITS
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0 <= errnum <= 32767
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LINK LIBRARY
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int calc_errno; /* global calc_errno value */
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CONST char *error_table[E__COUNT+2]; /* calc coded error messages */
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SEE ALSO
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strcat, strcpy, strlen, strncmp, strncpy, strpos,
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strprintf, strscan, strscanf, substr,
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errcount, errmax, error, iserror, errno, newerror, errorcodes,
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stoponerror
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## Copyright (C) 1999-2006,2023 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 1996/04/30 03:05:18
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## File existed as early as: 1996
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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