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114 lines
2.9 KiB
C
114 lines
2.9 KiB
C
/*
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* math_error - a simple libcalc math error routine
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*/
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/*
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* Copyright (c) 1997 by Landon Curt Noll. All Rights Reserved.
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright, this permission notice and text
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* this comment, and the disclaimer below appear in all of the following:
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*
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* supporting documentation
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* source copies
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* source works derived from this source
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* binaries derived from this source or from derived source
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*
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* LANDON CURT NOLL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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* EVENT SHALL LANDON CURT NOLL BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* chongo was here /\../\
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*/
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/*
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* Your program MUST provide a function called math_error. This is called
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* by the math routines on an error condition, such as malloc failures or a
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* division by zero. The routine is called in the manner of printf, with a
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* format string and optional arguments.
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*
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* By default, this routine simply prints a message to stderr and then exits.
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*
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* If one sets up calc_jmp_buf, and then sets calc_jmp to non-zero then
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* this routine will longjmp back (with the value of calc_jmp) instead.
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* In addition, the last calc error message will be found in calc_error;
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* this error is not printed to sttderr.
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*
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* For example:
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*
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* #include <setjmp.h>
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*
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* extern jmp_buf calc_jmp_buf;
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* extern int calc_jmp;
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* extern char *calc_error;
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* int error;
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*
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* ...
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*
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* if ((error = setjmp(calc_jmp_buf)) != 0) {
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*
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* (* reinitialize calc after a longjmp *)
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* reinitialize();
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*
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* (* report the error *)
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* printf("Ouch: %s\n", calc_error);
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* }
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* calc_jmp = 1;
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*/
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#include <stdio.h>
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#include <setjmp.h>
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#include "args.h"
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#include "calc.h"
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#include "math_error.h"
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/*
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* error jump point we will longjmp to this jmp_buf if calc_jmp is non-zero
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*/
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jmp_buf calc_jmp_buf;
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int calc_jmp = 0; /* non-zero => use calc_jmp_buf */
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char calc_error[MAXERROR+1]; /* last calc error message */
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/*
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* math_error - print a math error and exit
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*/
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void
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math_error(char *fmt, ...)
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{
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va_list ap;
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/*
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* format the error
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*/
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#ifdef VARARGS
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va_start(ap);
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#else
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va_start(ap, fmt);
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#endif
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vsprintf(calc_error, fmt, ap);
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va_end(ap);
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/*
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* if we should longjmp, so do
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*/
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if (calc_jmp != 0) {
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longjmp(calc_jmp_buf, calc_jmp);
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}
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/*
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* print error message and edit
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*/
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(void) fflush(stdout);
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(void) fflush(stderr);
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fprintf(stderr, "%s\n", calc_error);
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fputc('\n', stderr);
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libcalc_call_me_last();
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exit(1);
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}
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