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- /* Shared definitions for GNU DIFF
- Copyright (C) 1988, 89, 91, 92 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 <ctype.h>
- #include <stdio.h>
- #include "system.h"
- #include "regex.h"
-
- #ifndef PR_FILE_NAME
- #define PR_FILE_NAME "/bin/pr"
- #endif
-
- /* Character classes. */
- extern const char textchar[];
-
- /* Is_space is a little broader than ctype.h's isspace,
- because it also includes backspace and no-break space. */
- #define Is_space(c) (textchar[c] & 2)
-
- #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;
-
- /* Ignore changes in horizontal whitespace (-b). */
- EXTERN int ignore_space_change_flag;
-
- /* Ignore all horizontal whitespace (-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 lengths are different.
- This depends on various options. */
- EXTERN int length_varies;
-
- /* 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;
-
- /* character that ends a line. Currently this is always `\n'. */
- EXTERN char line_end_char;
-
- /* 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 const char *group_format[CHANGED + 1];
-
- /* Line formats for old, new, and unchanged lines. */
- EXTERN const 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;
-
- /* 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 *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. */
- int bufsize;
- /* Number of valid characters now in the buffer. */
- int buffered_chars;
-
- /* Array of pointers to lines in the file. */
- const char **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. */
- const char *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. */
- const char *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];
-
- /* Queue up one-line messages to be printed at the end,
- when -l is specified. Each message is recorded with a `struct msg'. */
-
- struct msg
- {
- struct msg *next;
- char *format;
- char *arg1;
- char *arg2;
- };
-
- /* Head of the chain of queues messages. */
-
- EXTERN struct msg *msg_chain;
-
- /* Tail of the chain of queues messages. */
-
- EXTERN struct msg *msg_chain_end;
-
- /* Stdio stream to output diffs to. */
-
- EXTERN FILE *outfile;
-
- /* Declare various functions. */
-
- #if __STDC__
- #define VOID void
- #else
- #define VOID char
- #endif
- VOID *xmalloc ();
- VOID *xrealloc ();
- char *concat ();
-
- int excluded_filename ();
- int sip ();
-
- struct change *find_change ();
-
- void analyze_hunk ();
- void begin_output ();
- void error ();
- void fatal ();
- void message ();
- void output_1_line ();
- void perror_with_name ();
- void pfatal_with_name ();
- void print_1_line ();
- void print_context_header ();
- void print_message_queue ();
- void print_number_range ();
- void print_script ();
- void slurp ();
- void translate_range ();
-