Plan 9 from Bell Labs’s /usr/web/sources/contrib/de0u/root/sys/src/cmd/squeak/Cross/plugins/JPEGReadWriter2Plugin/Error.c

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Distributed under the MIT License.
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#include <stdio.h>
#include "jpeglib.h"
#include <setjmp.h>

struct error_mgr2 {
  struct jpeg_error_mgr pub;	/* "public" fields */

  jmp_buf setjmp_buffer;	/* for return to caller */
};

typedef struct error_mgr2 * error_ptr2;

/*
 * Here's the routine that will replace the standard error_exit method:
 */

void error_exit (j_common_ptr cinfo)
{
  /* cinfo->err really points to a error_mgr2 struct, so coerce pointer */
  error_ptr2 myerr = (error_ptr2) cinfo->err;

  /* Return control to the setjmp point */
  longjmp(myerr->setjmp_buffer, 1);
}

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