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- /* Shared definitions for GNU DIFF
- Copyright (C) 1988, 1989 Free Software Foundation, Inc.
- Modified for DOS and OS/2 on 1991/09/14 by Kai Uwe Rommel
- <rommel@informatik.tu-muenchen.de>.
-
- 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 1, 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>
- #ifdef __TURBOC__
- #include <types.h>
- #else
- #include <sys/types.h>
- #endif
- #include <sys/stat.h>
-
- #include <string.h>
-
- #ifdef USG
- #include <time.h>
- #ifdef HAVE_NDIR
- #ifdef NDIR_IN_SYS
- #include <sys/ndir.h>
- #else
- #include <ndir.h>
- #endif /* not NDIR_IN_SYS */
- #else
- #ifndef MSDOS
- #include <dirent.h>
- #endif
- #endif /* not HAVE_NDIR */
- #include <fcntl.h>
- #ifndef HAVE_DIRECT
- #define direct dirent
- #endif
- #else /* not USG */
- #include <sys/time.h>
- #include <sys/dir.h>
- #include <sys/file.h>
- #endif
-
- #ifdef USG
- /* Define needed BSD functions in terms of sysV library. */
-
- #ifdef MSDOS
- #define bcopy(s,d,n) memmove((d),(s),(n))
- #else
- #define bcopy(s,d,n) memcpy((d),(s),(n))
- #endif
- #define bcmp(s1,s2,n) memcmp((s1),(s2),(n))
- #define bzero(s,n) memset((s),0,(n))
-
- #ifndef XENIX
- #ifndef MSDOS
- #define dup2(f,t) (close(t),fcntl((f),F_DUPFD,(t)))
- #endif
- #endif
-
- #define vfork fork
- #define index strchr
- #define rindex strrchr
- #endif
-
- #ifdef sparc
- /* vfork clobbers registers on the Sparc, so don't use it. */
- #define vfork fork
- #endif
-
- #ifdef MSDOS
- #include <process.h>
- #include <stdlib.h>
- #endif /* MSDOS */
-
- #include <errno.h>
- #if !defined(MSDOS)
- extern int errno;
- extern int sys_nerr;
- extern char *sys_errlist[];
- #endif
-
- #define EOS (0)
- #define FALSE (0)
- #define TRUE 1
-
- #if !defined(min)
- #define min(a,b) ((a) <= (b) ? (a) : (b))
- #define max(a,b) ((a) >= (b) ? (a) : (b))
- #endif /* MSDOS */
-
- #ifndef PR_FILE_NAME
- #define PR_FILE_NAME "/bin/pr"
- #endif
-
- /* Support old-fashioned C compilers. */
- #if defined (__STDC__) || defined (__GNUC__)
- #if !defined(MSDOS)
- #include "limits.h"
- #else
- #include <limits.h>
- #endif /* MSDOS */
- #else
- #define INT_MAX 2147483647
- #define CHAR_BIT 8
- #endif
-
- #if defined(MSDOS)
- #ifdef INT_MAX
- #undef INT_MAX
- #include <limits.h>
- #endif
- #ifdef __TURBOC__
- #include <alloc.h>
- #include <mem.h>
- #define halloc(n, s) farmalloc((long) n * s)
- #define hrealloc(x, s, o) farrealloc(x, s)
- #define hfree(x) farfree(x)
- #else
- #include <malloc.h>
- #include <memory.h>
- #endif
- #include <io.h>
- extern int getopt(int nargc,char **nargv,char *ostr);
- #endif
-
- /* Support old-fashioned C compilers. */
- #if !defined (__STDC__) && !defined (__GNUC__) || defined(MSDOS)
- #define const
- #endif
-
- #ifndef O_RDONLY
- #define O_RDONLY 0
- #endif
-
- /* 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 merged in side-by-side display (-m). */
- OUTPUT_MERGED
- };
-
- /* 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_CONTEXT || (S) == OUTPUT_UNIFIED || (S) == OUTPUT_RCS \
- || (S) == OUTPUT_NORMAL)
-
- EXTERN enum output_style output_style;
-
- /* 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;
-
- /* Ignore changes that affect only lines matching this regexp (-I). */
- EXTERN char *ignore_regexp;
-
- /* Result of regex-compilation of `ignore_regexp'. */
- EXTERN struct re_pattern_buffer ignore_regexp_compiled;
-
- /* 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];
-
- /* Regexp to identify function-header lines (-F). */
- EXTERN char *function_regexp;
-
- /* Result of regex-compilation of `function_regexp'. */
- EXTERN struct re_pattern_buffer function_regexp_compiled;
-
- /* 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;
-
- /* Pipe each file's output through pr (-l). */
- EXTERN int paginate_flag;
-
- /* Line width for the merged display (-m,-M). */
- EXTERN int line_width;
-
- /* String to use for #ifdef (-D). */
- EXTERN char * ifdef_string;
-
- /* 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;
-
- /* Reduce extraneous output when they're outputting a patch. */
- EXTERN int output_patch_flag;
-
- /* 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 line of text. */
-
- struct line_def {
- #ifdef MSDOS
- char huge *text;
- #else
- char *text;
- #endif
- int length;
- unsigned hash;
- };
-
- /* 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; /* 1 if file is a directory */
-
- #if !defined(MSDOS)
- /* 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 data on analyzed lines of this chunk of this file. */
- struct line_def *linbuf;
-
- /* Allocated size of linbuf array (# of elements). */
- int linbufsize;
-
- /* Number of elements of linbuf containing valid data. */
- int buffered_lines;
-
- /* Pointer to end of prefix of this file to ignore when hashing. */
- char *prefix_end;
-
- /* Count of lines in the prefix. */
- int prefix_lines;
-
- /* Pointer to start of suffix of this file to ignore when hashing. */
- char *suffix_begin;
-
- /* Count of lines in the suffix. */
- int suffix_lines;
- #else /* MSDOS */
- /* Buffer in which text of file is read. */
- char huge *buffer;
- /* Allocated size of buffer. */
- long int bufsize;
- /* Number of valid characters now in the buffer. */
- long int buffered_chars;
-
- /* Array of data on analyzed lines of this chunk of this file. */
- struct line_def huge *linbuf;
-
- /* Allocated size of linbuf array (# of elements). */
- int linbufsize;
-
- /* Number of elements of linbuf containing valid data. */
- int buffered_lines;
-
- /* Pointer to end of prefix of this file to ignore when hashing. */
- char huge *prefix_end;
-
- /* Count of lines in the prefix. */
- int prefix_lines;
-
- /* Pointer to start of suffix of this file to ignore when hashing. */
- char huge *suffix_begin;
-
- /* Count of lines in the suffix. */
- int suffix_lines;
- #endif /* MSDOS */
-
- /* 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;
-
- /* Table translating diff's internal line numbers
- to actual line numbers in the file.
- This is needed only when some lines have been discarded.
- The allocated size is always linbufsize
- and the number of valid elements is buffered_lines. */
- int *ltran;
- };
-
- /* Describe the two files currently being compared. */
-
- #if defined(__TURBOC__) && !defined(GDIFF_MAIN)
- extern struct file_data files[2];
- #else
- struct file_data files[2];
- #endif
-
- /* 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. */
-
- #ifdef __STDC__
- #define VOID void
- #else
- #define VOID char
- #endif
- VOID *xmalloc ();
- VOID *xrealloc ();
- char *concat ();
- void free ();
- char *rindex ();
- char *index ();
-
- void analyze_hunk ();
- void error ();
- void fatal ();
- void message ();
- void perror_with_name ();
- void pfatal_with_name ();
- void print_1_line ();
- void print_message_queue ();
- void print_number_range ();
-
- #ifdef MSDOS
- #ifndef __TURBOC__
- void huge *hrealloc(void huge *, long, long);
- #endif
- #endif
- void print_script ();
- void translate_range ();
-
-
- #ifdef PROTO
- #include "proto.h"
- #endif
-