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/* Interface header file for GNU DIFF library.
Copyright (C) 1998 Free Software Foundation, Inc.
This file is part of GNU DIFF.
GNU DIFF is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU DIFF is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
#ifndef DIFFRUN_H
#define DIFFRUN_H
/* This header file defines the interfaces used by the diff library.
It should be included by programs which use the diff library. */
#include <sys/types.h>
#if defined __STDC__ && __STDC__
#define DIFFPARAMS(args) args
#else
#define DIFFPARAMS(args) ()
#endif
/* The diff_callbacks structure is used to handle callbacks from the
diff library. All output goes through these callbacks. When a
pointer to this structure is passed in, it may be NULL. Also, any
of the individual callbacks may be NULL. This means that the
default action should be taken. */
struct diff_callbacks
{
/* Write output. This function just writes a string of a given
length to the output file. The default is to fwrite to OUTFILE.
If this callback is defined, flush_output must also be defined.
If the length is zero, output zero bytes. */
void (*write_output) DIFFPARAMS((char const *, size_t));
/* Flush output. The default is to fflush OUTFILE. If this
callback is defined, write_output must also be defined. */
void (*flush_output) DIFFPARAMS((void));
/* Write a '\0'-terminated string to stdout.
This is called for version and help messages. */
void (*write_stdout) DIFFPARAMS((char const *));
/* Print an error message. The first argument is a printf format,
and the next two are parameters. The default is to print a
message on stderr. */
void (*error) DIFFPARAMS((char const *, char const *, char const *));
};
/* Run a diff. */
extern int diff_run DIFFPARAMS((int, char **, const char *,
const struct diff_callbacks *));
/* Run a diff3. */
extern int diff3_run DIFFPARAMS((int, char **, char *,
const struct diff_callbacks *));
#undef DIFFPARAMS
#endif /* DIFFRUN_H */
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