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- /* Shared definitions for GNU DIFF
- Copyright (C) 1988, 89, 91, 92, 93 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.
-
- You should have received a copy of the GNU General Public License
- along with GNU DIFF; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "system.h"
- #include <stdio.h>
- #include "regex.h"
-
- #define TAB_WIDTH 8
-
- /* Variables for command line options */
-
- #ifndef GDIFF_MAIN
- #define EXTERN extern
- #else
- #define EXTERN
- #endif
-
- enum output_style {
- /* Default output style. */
- OUTPUT_NORMAL,
- /* Output the differences with lines of context before and after (-c). */
- OUTPUT_CONTEXT,
- /* Output the differences in a unified context diff format (-u). */
- OUTPUT_UNIFIED,
- /* Output the differences as commands suitable for `ed' (-e). */
- OUTPUT_ED,
- /* Output the diff as a forward ed script (-f). */
- OUTPUT_FORWARD_ED,
- /* Like -f, but output a count of changed lines in each "command" (-n). */
- OUTPUT_RCS,
- /* Output merged #ifdef'd file (-D). */
- OUTPUT_IFDEF,
- /* Output sdiff style (-y). */
- OUTPUT_SDIFF
- };
-
- /* True for output styles that are robust,
- i.e. can handle a file that ends in a non-newline. */
- #define ROBUST_OUTPUT_STYLE(S) ((S) != OUTPUT_ED && (S) != OUTPUT_FORWARD_ED)
-
- EXTERN enum output_style output_style;
-
- /* Nonzero if output cannot be generated for identical files. */
- EXTERN int no_diff_means_no_output;
-
- /* Number of lines of context to show in each set of diffs.
- This is zero when context is not to be shown. */
- EXTERN int context;
-
- /* Consider all files as text files (-a).
- Don't interpret codes over 0177 as implying a "binary file". */
- EXTERN int always_text_flag;
-
- /* Number of lines to keep in identical prefix and suffix. */
- EXTERN int horizon_lines;
-
- /* Ignore changes in horizontal white space (-b). */
- EXTERN int ignore_space_change_flag;
-
- /* Ignore all horizontal white space (-w). */
- EXTERN int ignore_all_space_flag;
-
- /* Ignore changes that affect only blank lines (-B). */
- EXTERN int ignore_blank_lines_flag;
-
- /* 1 if lines may match even if their contents do not match exactly.
- This depends on various options. */
- EXTERN int ignore_some_line_changes;
-
- /* 1 if files may match even if their contents are not byte-for-byte identical.
- This depends on various options. */
- EXTERN int ignore_some_changes;
-
- /* Ignore differences in case of letters (-i). */
- EXTERN int ignore_case_flag;
-
- /* File labels for `-c' output headers (-L). */
- EXTERN char *file_label[2];
-
- struct regexp_list
- {
- struct re_pattern_buffer buf;
- struct regexp_list *next;
- };
-
- /* Regexp to identify function-header lines (-F). */
- EXTERN struct regexp_list *function_regexp_list;
-
- /* Ignore changes that affect only lines matching this regexp (-I). */
- EXTERN struct regexp_list *ignore_regexp_list;
-
- /* Say only whether files differ, not how (-q). */
- EXTERN int no_details_flag;
-
- /* Report files compared that match (-s).
- Normally nothing is output when that happens. */
- EXTERN int print_file_same_flag;
-
- /* Output the differences with exactly 8 columns added to each line
- so that any tabs in the text line up properly (-T). */
- EXTERN int tab_align_flag;
-
- /* Expand tabs in the output so the text lines up properly
- despite the characters added to the front of each line (-t). */
- EXTERN int tab_expand_flag;
-
- /* In directory comparison, specify file to start with (-S).
- All file names less than this name are ignored. */
- EXTERN char *dir_start_file;
-
- /* If a file is new (appears in only one dir)
- include its entire contents (-N).
- Then `patch' would create the file with appropriate contents. */
- EXTERN int entire_new_file_flag;
-
- /* If a file is new (appears in only the second dir)
- include its entire contents (-P).
- Then `patch' would create the file with appropriate contents. */
- EXTERN int unidirectional_new_file_flag;
-
- /* Pipe each file's output through pr (-l). */
- EXTERN int paginate_flag;
-
- enum line_class {
- /* Lines taken from just the first file. */
- OLD,
- /* Lines taken from just the second file. */
- NEW,
- /* Lines common to both files. */
- UNCHANGED,
- /* A hunk containing both old and new lines (line groups only). */
- CHANGED
- };
-
- /* Line group formats for old, new, unchanged, and changed groups. */
- EXTERN char *group_format[CHANGED + 1];
-
- /* Line formats for old, new, and unchanged lines. */
- EXTERN char *line_format[UNCHANGED + 1];
-
- /* If using OUTPUT_SDIFF print extra information to help the sdiff filter. */
- EXTERN int sdiff_help_sdiff;
-
- /* Tell OUTPUT_SDIFF to show only the left version of common lines. */
- EXTERN int sdiff_left_only;
-
- /* Tell OUTPUT_SDIFF to not show common lines. */
- EXTERN int sdiff_skip_common_lines;
-
- /* The half line width and column 2 offset for OUTPUT_SDIFF. */
- EXTERN unsigned sdiff_half_width;
- EXTERN unsigned sdiff_column2_offset;
-
- /* String containing all the command options diff received,
- with spaces between and at the beginning but none at the end.
- If there were no options given, this string is empty. */
- EXTERN char * switch_string;
-
- /* Nonzero means use heuristics for better speed. */
- EXTERN int heuristic;
-
- /* Name of program the user invoked (for error messages). */
- EXTERN char *program_name;
-
- /* The result of comparison is an "edit script": a chain of `struct change'.
- Each `struct change' represents one place where some lines are deleted
- and some are inserted.
-
- LINE0 and LINE1 are the first affected lines in the two files (origin 0).
- DELETED is the number of lines deleted here from file 0.
- INSERTED is the number of lines inserted here in file 1.
-
- If DELETED is 0 then LINE0 is the number of the line before
- which the insertion was done; vice versa for INSERTED and LINE1. */
-
- struct change
- {
- struct change *link; /* Previous or next edit command */
- int inserted; /* # lines of file 1 changed here. */
- int deleted; /* # lines of file 0 changed here. */
- int line0; /* Line number of 1st deleted line. */
- int line1; /* Line number of 1st inserted line. */
- char ignore; /* Flag used in context.c */
- };
-
- /* Structures that describe the input files. */
-
- /* Data on one input file being compared. */
-
- struct file_data {
- int desc; /* File descriptor */
- char const *name; /* File name */
- struct stat stat; /* File status from fstat() */
- int dir_p; /* nonzero if file is a directory */
-
- /* Buffer in which text of file is read. */
- char * buffer;
- /* Allocated size of buffer. */
- size_t bufsize;
- /* Number of valid characters now in the buffer. */
- size_t buffered_chars;
-
- /* Array of pointers to lines in the file. */
- char const **linbuf;
-
- /* linbuf_base <= buffered_lines <= valid_lines <= alloc_lines.
- linebuf[linbuf_base ... buffered_lines - 1] are possibly differing.
- linebuf[linbuf_base ... valid_lines - 1] contain valid data.
- linebuf[linbuf_base ... alloc_lines - 1] are allocated. */
- int linbuf_base, buffered_lines, valid_lines, alloc_lines;
-
- /* Pointer to end of prefix of this file to ignore when hashing. */
- char const *prefix_end;
-
- /* Count of lines in the prefix.
- There are this many lines in the file before linbuf[0]. */
- int prefix_lines;
-
- /* Pointer to start of suffix of this file to ignore when hashing. */
- char const *suffix_begin;
-
- /* Vector, indexed by line number, containing an equivalence code for
- each line. It is this vector that is actually compared with that
- of another file to generate differences. */
- int *equivs;
-
- /* Vector, like the previous one except that
- the elements for discarded lines have been squeezed out. */
- int *undiscarded;
-
- /* Vector mapping virtual line numbers (not counting discarded lines)
- to real ones (counting those lines). Both are origin-0. */
- int *realindexes;
-
- /* Total number of nondiscarded lines. */
- int nondiscarded_lines;
-
- /* Vector, indexed by real origin-0 line number,
- containing 1 for a line that is an insertion or a deletion.
- The results of comparison are stored here. */
- char *changed_flag;
-
- /* 1 if file ends in a line with no final newline. */
- int missing_newline;
-
- /* 1 more than the maximum equivalence value used for this or its
- sibling file. */
- int equiv_max;
- };
-
- /* Describe the two files currently being compared. */
-
- EXTERN struct file_data files[2];
-
- /* Stdio stream to output diffs to. */
-
- EXTERN FILE *outfile;
-
- /* Declare various functions. */
-
- /* analyze.c */
- int diff_2_files PARAMS((struct file_data[], int));
-
- /* context.c */
- void print_context_header PARAMS((struct file_data[], int));
- void print_context_script PARAMS((struct change *, int));
-
- /* diff.c */
- int excluded_filename PARAMS((char const *));
-
- /* dir.c */
- int diff_dirs PARAMS((struct file_data const[], int (*) PARAMS((char const *, char const *, char const *, char const *, int)), int));
-
- /* ed.c */
- void print_ed_script PARAMS((struct change *));
- void pr_forward_ed_script PARAMS((struct change *));
-
- /* ifdef.c */
- void print_ifdef_script PARAMS((struct change *));
-
- /* io.c */
- int read_files PARAMS((struct file_data[], int));
- int sip PARAMS((struct file_data *, int));
- void slurp PARAMS((struct file_data *));
-
- /* normal.c */
- void print_normal_script PARAMS((struct change *));
-
- /* rcs.c */
- void print_rcs_script PARAMS((struct change *));
-
- /* side.c */
- void print_sdiff_script PARAMS((struct change *));
-
- /* util.c */
- VOID *xmalloc PARAMS((size_t));
- VOID *xrealloc PARAMS((VOID *, size_t));
- char *concat PARAMS((char const *, char const *, char const *));
- char *dir_file_pathname PARAMS((char const *, char const *));
- int change_letter PARAMS((int, int));
- int line_cmp PARAMS((char const *, char const *));
- int translate_line_number PARAMS((struct file_data const *, int));
- struct change *find_change PARAMS((struct change *));
- struct change *find_reverse_change PARAMS((struct change *));
- void analyze_hunk PARAMS((struct change *, int *, int *, int *, int *, int *, int *));
- void begin_output PARAMS((void));
- void debug_script PARAMS((struct change *));
- void error PARAMS((char const *, char const *, char const *));
- void fatal PARAMS((char const *));
- void finish_output PARAMS((void));
- void message PARAMS((char const *, char const *, char const *));
- void message5 PARAMS((char const *, char const *, char const *, char const *, char const *));
- void output_1_line PARAMS((char const *, char const *, char const *, char const *));
- void perror_with_name PARAMS((char const *));
- void pfatal_with_name PARAMS((char const *));
- void print_1_line PARAMS((char const *, char const * const *));
- void print_message_queue PARAMS((void));
- void print_number_range PARAMS((int, struct file_data *, int, int));
- void print_script PARAMS((struct change *, struct change * (*) PARAMS((struct change *)), void (*) PARAMS((struct change *))));
- void setup_output PARAMS((char const *, char const *, int));
- void translate_range PARAMS((struct file_data const *, int, int, int *, int *));
-
- /* version.c */
- extern char const version_string[];
-