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fac3, 08/30/2024 09:07 AM

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usr.bin/Makefile
cut \
dc \
dfregress \
diff \
dirname \
drill \
dsynth \
usr.bin/diff/Makefile
# $OpenBSD: Makefile,v 1.3 2007/05/29 18:24:56 ray Exp $
PROG= diff
SRCS= diff.c diffdir.c diffreg.c xmalloc.c
COPTS+= -Wall
.include <bsd.prog.mk>
usr.bin/diff/diff.1
.\" $OpenBSD: diff.1,v 1.51 2023/01/05 00:00:44 millert Exp $
.\"
.\" Copyright (c) 1980, 1990, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 3. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)diff.1 8.1 (Berkeley) 6/30/93
.\"
.Dd $Mdocdate: January 5 2023 $
.Dt DIFF 1
.Os
.Sh NAME
.Nm diff
.Nd differential file and directory comparator
.Sh SYNOPSIS
.Nm diff
.Op Fl abdipTtw
.Oo
.Fl c | e | f |
.Fl n | q | u
.Oc
.Op Fl I Ar pattern
.Op Fl L Ar label
.Ar file1 file2
.Nm diff
.Op Fl abdipTtw
.Op Fl I Ar pattern
.Op Fl L Ar label
.Fl C Ar number
.Ar file1 file2
.Nm diff
.Op Fl abditw
.Op Fl I Ar pattern
.Fl D Ar string
.Ar file1 file2
.Nm diff
.Op Fl abdipTtw
.Op Fl I Ar pattern
.Op Fl L Ar label
.Fl U Ar number
.Ar file1 file2
.Nm diff
.Op Fl abdiNPprsTtw
.Oo
.Fl c | e | f |
.Fl n | q | u
.Oc
.Op Fl I Ar pattern
.Bk -words
.Op Fl L Ar label
.Op Fl S Ar name
.Op Fl X Ar file
.Op Fl x Ar pattern
.Ek
.Ar dir1 dir2
.Sh DESCRIPTION
The
.Nm
utility compares the contents of
.Ar file1
and
.Ar file2
and writes to the standard output the list of changes necessary to
convert one file into the other.
No output is produced if the files are identical.
.Pp
Output options (mutually exclusive):
.Bl -tag -width Ds
.It Fl C Ar number
Like
.Fl c
but produces a diff with
.Ar number
lines of context.
.It Fl c
Produces a diff with 3 lines of context.
With
.Fl c
the output format is modified slightly:
the output begins with identification of the files involved and
their creation dates and then each change is separated
by a line with fifteen
.Li * Ns 's .
The lines removed from
.Ar file1
are marked with
.Sq \-\ \& ;
those added to
.Ar file2
are marked
.Sq +\ \& .
Lines which are changed from one file to the other are marked in
both files with
.Sq !\ \& .
Changes which lie within 3 lines of each other are grouped together on
output.
.It Fl D Ar string
Creates a merged version of
.Ar file1
and
.Ar file2
on the standard output, with C preprocessor controls included so that
a compilation of the result without defining
.Ar string
is equivalent to compiling
.Ar file1 ,
while defining
.Ar string
will yield
.Ar file2 .
.It Fl e
Produces output in a form suitable as input for the editor utility,
.Xr ed 1 ,
which can then be used to convert file1 into file2.
.Pp
Extra commands are added to the output when comparing directories with
.Fl e ,
so that the result is a
.Xr sh 1
script for converting text files which are common to the two directories
from their state in
.Ar dir1
to their state in
.Ar dir2 .
.It Fl f
Identical output to that of the
.Fl e
flag, but in reverse order.
It cannot be digested by
.Xr ed 1 .
.It Fl n
Produces a script similar to that of
.Fl e ,
but in the opposite order and with a count of changed lines on each
insert or delete command.
This is the form used by
.Xr rcsdiff 1 .
.It Fl q
Just print a line when the files differ.
Does not output a list of changes.
.It Fl U Ar number
Like
.Fl u
but produces a diff with
.Ar number
lines of context.
.It Fl u
Produces a
.Em unified
diff with 3 lines of context.
A unified diff is similar to the context diff produced by the
.Fl c
option.
However, unlike with
.Fl c ,
all lines to be changed (added and/or removed) are present in
a single section.
.El
.Pp
Comparison options:
.Bl -tag -width Ds
.It Fl a
Treat all files as ASCII text.
Normally
.Nm
will simply print
.Dq Binary files ... differ
if files contain binary characters.
Use of this option forces
.Nm
to produce a diff.
.It Fl b
Causes trailing blanks (spaces and tabs) to be ignored, and other
strings of blanks to compare equal.
.It Fl d
Try very hard to produce a diff as small as possible.
This may consume a lot of processing power and memory when processing
large files with many changes.
.It Fl I Ar pattern
Ignores changes, insertions, and deletions whose lines match the
extended regular expression
.Ar pattern .
Multiple
.Fl I
patterns may be specified.
All lines in the change must match some pattern for the change to be
ignored.
See
.Xr re_format 7
for more information on regular expression patterns.
.It Fl i
Ignores the case of letters.
E.g.,
.Dq A
will compare equal to
.Dq a .
.It Fl L Ar label
Print
.Ar label
instead of the first (and second, if this option is specified twice)
file name and time in the context or unified diff header.
.It Fl p
With unified and context diffs, show with each change
the first 40 characters of the last line before the context beginning
with a letter, an underscore or a dollar sign.
For C source code following standard layout conventions, this will
show the prototype of the function the change applies to.
.It Fl T
Print a tab rather than a space before the rest of the line for the
normal, context or unified output formats.
This makes the alignment of tabs in the line consistent.
.It Fl t
Will expand tabs in output lines.
Normal or
.Fl c
output adds character(s) to the front of each line which may screw up
the indentation of the original source lines and make the output listing
difficult to interpret.
This option will preserve the original source's indentation.
.It Fl w
Is similar to
.Fl b
but causes whitespace (blanks and tabs) to be totally ignored.
E.g.,
.Dq if (\ \&a == b \&)
will compare equal to
.Dq if(a==b) .
.El
.Pp
Directory comparison options:
.Bl -tag -width Ds
.It Fl N
If a file is found in only one directory, act as if it was found in the
other directory too but was of zero size.
.It Fl P
If a file is found only in
.Ar dir2 ,
act as if it was found in
.Ar dir1
too but was of zero size.
.It Fl r
Causes application of
.Nm
recursively to common subdirectories encountered.
.It Fl S Ar name
Re-starts a directory
.Nm
in the middle, beginning with file
.Ar name .
.It Fl s
Causes
.Nm
to report files which are the same, which are otherwise not mentioned.
.It Fl X Ar file
Exclude files and subdirectories from comparison whose basenames match
lines in
.Ar file .
Multiple
.Fl X
options may be specified.
.It Fl x Ar pattern
Exclude files and subdirectories from comparison whose basenames match
.Ar pattern .
Patterns are matched using shell-style globbing via
.Xr fnmatch 3 .
Multiple
.Fl x
options may be specified.
.El
.Pp
If both arguments are directories,
.Nm
sorts the contents of the directories by name, and then runs the
regular file
.Nm
algorithm, producing a change list,
on text files which are different.
Binary files which differ,
common subdirectories, and files which appear in only one directory
are described as such.
In directory mode only regular files and directories are compared.
If a non-regular file such as a device special file or FIFO
is encountered, a diagnostic message is printed.
.Pp
If only one of
.Ar file1
and
.Ar file2
is a directory,
.Nm
is applied to the non-directory file and the file contained in
the directory file with a filename that is the same as the
last component of the non-directory file.
.Pp
If either
.Ar file1
or
.Ar file2
is
.Sq - ,
the standard input is
used in its place.
.Ss Output Style
The default (without
.Fl e ,
.Fl c ,
or
.Fl n
.\" -C
options)
output contains lines of these forms, where
.Va XX , YY , ZZ , QQ
are line numbers respective of file order.
.Pp
.Bl -tag -width "XX,YYcZZ,QQ" -compact
.It Li XX Ns Ic a Ns Li YY
At (the end of) line
.Va XX
of
.Ar file1 ,
append the contents
of line
.Va YY
of
.Ar file2
to make them equal.
.It Li XX Ns Ic a Ns Li YY,ZZ
Same as above, but append the range of lines,
.Va YY
through
.Va ZZ
of
.Ar file2
to line
.Va XX
of file1.
.It Li XX Ns Ic d Ns Li YY
At line
.Va XX
delete
the line.
The value
.Va YY
tells to which line the change would bring
.Ar file1
in line with
.Ar file2 .
.It Li XX,YY Ns Ic d Ns Li ZZ
Delete the range of lines
.Va XX
through
.Va YY
in
.Ar file1 .
.It Li XX Ns Ic c Ns Li YY
Change the line
.Va XX
in
.Ar file1
to the line
.Va YY
in
.Ar file2 .
.It Li XX,YY Ns Ic c Ns Li ZZ
Replace the range of specified lines with the line
.Va ZZ .
.It Li XX,YY Ns Ic c Ns Li ZZ,QQ
Replace the range
.Va XX , Ns Va YY
from
.Ar file1
with the range
.Va ZZ , Ns Va QQ
from
.Ar file2 .
.El
.Pp
These lines resemble
.Xr ed 1
subcommands to convert
.Ar file1
into
.Ar file2 .
The line numbers before the action letters pertain to
.Ar file1 ;
those after pertain to
.Ar file2 .
Thus, by exchanging
.Ic a
for
.Ic d
and reading the line in reverse order, one can also
determine how to convert
.Ar file2
into
.Ar file1 .
As in
.Xr ed 1 ,
identical
pairs (where num1 = num2) are abbreviated as a single
number.
.Sh FILES
.Bl -tag -width /tmp/diff.XXXXXXXX -compact
.It Pa /tmp/diff. Ns Ar XXXXXXXX
Temporary file used when comparing a device or the standard input.
Note that the temporary file is unlinked as soon as it is created
so it will not show up in a directory listing.
.El
.Sh EXIT STATUS
The
.Nm
utility exits with one of the following values:
.Pp
.Bl -tag -width Ds -offset indent -compact
.It 0
No differences were found.
.It 1
Differences were found.
.It >1
An error occurred.
.El
.Sh SEE ALSO
.Xr cmp 1 ,
.Xr comm 1 ,
.Xr diff3 1 ,
.Xr ed 1 ,
.Xr patch 1 ,
.Xr sdiff 1
.Rs
.%A James W. Hunt
.%A M. Douglas McIlroy
.%T "An Algorithm for Differential File Comparison"
.%I AT&T Bell Laboratories
.%J Computing Science Technical Report
.%N 41
.%D June 1976
.Re
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2008
specification.
.Pp
The flags
.Op Fl aDdIiLNnPpqSsTtwXx
are extensions to that specification.
.Sh HISTORY
A
.Nm
command appeared in
.At v5 .
usr.bin/diff/diff.c
/* $OpenBSD: diff.c,v 1.68 2023/01/05 00:00:44 millert Exp $ */
/*
* Copyright (c) 2003 Todd C. Miller <millert@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "diff.h"
#include "xmalloc.h"
static const char diff_version[] = "DragonFlyBSD diff 20240601";
int Nflag, Pflag, rflag, sflag, Tflag;
int diff_format, diff_context, status;
char *start, *ifdefname, *diffargs, *label[2], *ignore_pats;
struct stat stb1, stb2;
struct excludes *excludes_list;
regex_t ignore_re;
#define OPTIONS "0123456789abC:cdD:efhI:iL:nNPpqrS:sTtU:uwX:x:"
static struct option longopts[] = {
{ "text", no_argument, 0, 'a' },
{ "ignore-space-change", no_argument, 0, 'b' },
{ "context", optional_argument, 0, 'C' },
{ "ifdef", required_argument, 0, 'D' },
{ "minimal", no_argument, 0, 'd' },
{ "ed", no_argument, 0, 'e' },
{ "forward-ed", no_argument, 0, 'f' },
{ "ignore-matching-lines", required_argument, 0, 'I' },
{ "ignore-case", no_argument, 0, 'i' },
{ "label", required_argument, 0, 'L' },
{ "new-file", no_argument, 0, 'N' },
{ "rcs", no_argument, 0, 'n' },
{ "unidirectional-new-file", no_argument, 0, 'P' },
{ "show-c-function", no_argument, 0, 'p' },
{ "brief", no_argument, 0, 'q' },
{ "recursive", no_argument, 0, 'r' },
{ "report-identical-files", no_argument, 0, 's' },
{ "starting-file", required_argument, 0, 'S' },
{ "expand-tabs", no_argument, 0, 't' },
{ "initial-tab", no_argument, 0, 'T' },
{ "unified", optional_argument, 0, 'U' },
{ "ignore-all-space", no_argument, 0, 'w' },
{ "exclude", required_argument, 0, 'x' },
{ "exclude-from", required_argument, 0, 'X' },
{ NULL, 0, 0, '\0'}
};
void usage(void);
void push_excludes(char *);
void push_ignore_pats(char *);
void read_excludes_file(char *file);
void set_argstr(char **, char **);
int
main(int argc, char **argv)
{
char *ep, **oargv;
long l;
int ch, dflags, lastch, gotstdin, prevoptind, newarg;
oargv = argv;
gotstdin = 0;
dflags = 0;
lastch = '\0';
prevoptind = 1;
newarg = 1;
while ((ch = getopt_long(argc, argv, OPTIONS, longopts, NULL)) != -1) {
switch (ch) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (newarg)
usage(); /* disallow -[0-9]+ */
else if (lastch == 'c' || lastch == 'u')
diff_context = 0;
else if (!isdigit(lastch) || diff_context > INT_MAX / 10)
usage();
diff_context = (diff_context * 10) + (ch - '0');
break;
case 'a':
dflags |= D_FORCEASCII;
break;
case 'b':
dflags |= D_FOLDBLANKS;
break;
case 'C':
case 'c':
diff_format = D_CONTEXT;
if (optarg != NULL) {
l = strtol(optarg, &ep, 10);
if (*ep != '\0' || l < 0 || l >= INT_MAX)
usage();
diff_context = (int)l;
} else
diff_context = 3;
break;
case 'd':
dflags |= D_MINIMAL;
break;
case 'D':
diff_format = D_IFDEF;
ifdefname = optarg;
break;
case 'e':
diff_format = D_EDIT;
break;
case 'f':
diff_format = D_REVERSE;
break;
case 'h':
/* silently ignore for backwards compatibility */
break;
case 'I':
push_ignore_pats(optarg);
break;
case 'i':
dflags |= D_IGNORECASE;
break;
case 'L':
if (label[0] == NULL)
label[0] = optarg;
else if (label[1] == NULL)
label[1] = optarg;
else
usage();
break;
case 'N':
Nflag = 1;
break;
case 'n':
diff_format = D_NREVERSE;
break;
case 'p':
dflags |= D_PROTOTYPE;
break;
case 'P':
Pflag = 1;
break;
case 'r':
rflag = 1;
break;
case 'q':
diff_format = D_BRIEF;
break;
case 'S':
start = optarg;
break;
case 's':
sflag = 1;
break;
case 'T':
Tflag = 1;
break;
case 't':
dflags |= D_EXPANDTABS;
break;
case 'U':
case 'u':
diff_format = D_UNIFIED;
if (optarg != NULL) {
l = strtol(optarg, &ep, 10);
if (*ep != '\0' || l < 0 || l >= INT_MAX)
usage();
diff_context = (int)l;
} else
diff_context = 3;
break;
case 'v':
printf("%s\n", diff_version);
exit(0);
case 'w':
dflags |= D_IGNOREBLANKS;
break;
case 'X':
read_excludes_file(optarg);
break;
case 'x':
push_excludes(optarg);
break;
default:
usage();
break;
}
lastch = ch;
newarg = optind != prevoptind;
prevoptind = optind;
}
argc -= optind;
argv += optind;
/*
* Do sanity checks, fill in stb1 and stb2 and call the appropriate
* driver routine. Both drivers use the contents of stb1 and stb2.
*/
if (argc != 2)
usage();
if (ignore_pats != NULL) {
char buf[BUFSIZ];
int error;
if ((error = regcomp(&ignore_re, ignore_pats,
REG_NEWLINE | REG_EXTENDED)) != 0) {
regerror(error, &ignore_re, buf, sizeof(buf));
if (*ignore_pats != '\0')
errx(2, "%s: %s", ignore_pats, buf);
else
errx(2, "%s", buf);
}
}
if (strcmp(argv[0], "-") == 0) {
fstat(STDIN_FILENO, &stb1);
gotstdin = 1;
} else if (stat(argv[0], &stb1) != 0)
err(2, "%s", argv[0]);
if (strcmp(argv[1], "-") == 0) {
fstat(STDIN_FILENO, &stb2);
gotstdin = 1;
} else if (stat(argv[1], &stb2) != 0)
err(2, "%s", argv[1]);
if (gotstdin && (S_ISDIR(stb1.st_mode) || S_ISDIR(stb2.st_mode)))
errx(2, "can't compare - to a directory");
set_argstr(oargv, argv);
if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
if (diff_format == D_IFDEF)
errx(2, "-D option not supported with directories");
diffdir(argv[0], argv[1], dflags);
} else {
if (S_ISDIR(stb1.st_mode)) {
argv[0] = splice(argv[0], argv[1]);
if (stat(argv[0], &stb1) == -1)
err(2, "%s", argv[0]);
}
if (S_ISDIR(stb2.st_mode)) {
argv[1] = splice(argv[1], argv[0]);
if (stat(argv[1], &stb2) == -1)
err(2, "%s", argv[1]);
}
print_status(diffreg(argv[0], argv[1], dflags), argv[0], argv[1],
"");
}
exit(status);
}
void
set_argstr(char **av, char **ave)
{
size_t argsize;
char **ap;
argsize = 4 + *ave - *av + 1;
diffargs = xmalloc(argsize);
strlcpy(diffargs, "diff", argsize);
for (ap = av + 1; ap < ave; ap++) {
if (strcmp(*ap, "--") != 0) {
strlcat(diffargs, " ", argsize);
strlcat(diffargs, *ap, argsize);
}
}
}
/*
* Read in an excludes file and push each line.
*/
void
read_excludes_file(char *file)
{
FILE *fp;
char *buf, *pattern;
size_t len;
if (strcmp(file, "-") == 0)
fp = stdin;
else if ((fp = fopen(file, "r")) == NULL)
err(2, "%s", file);
while ((buf = fgetln(fp, &len)) != NULL) {
if (buf[len - 1] == '\n')
len--;
pattern = xmalloc(len + 1);
memcpy(pattern, buf, len);
pattern[len] = '\0';
push_excludes(pattern);
}
if (strcmp(file, "-") != 0)
fclose(fp);
}
/*
* Push a pattern onto the excludes list.
*/
void
push_excludes(char *pattern)
{
struct excludes *entry;
entry = xmalloc(sizeof(*entry));
entry->pattern = pattern;
entry->next = excludes_list;
excludes_list = entry;
}
void
push_ignore_pats(char *pattern)
{
size_t len;
if (ignore_pats == NULL)
ignore_pats = xstrdup(pattern);
else {
/* old + "|" + new + NUL */
len = strlen(ignore_pats) + strlen(pattern) + 2;
ignore_pats = xreallocarray(ignore_pats, 1, len);
strlcat(ignore_pats, "|", len);
strlcat(ignore_pats, pattern, len);
}
}
void
print_only(const char *path, size_t dirlen, const char *entry)
{
if (dirlen > 1)
dirlen--;
printf("Only in %.*s: %s\n", (int)dirlen, path, entry);
}
void
print_status(int val, char *path1, char *path2, const char *entry)
{
switch (val) {
case D_BINARY:
printf("Binary files %s%s and %s%s differ\n",
path1, entry, path2, entry);
break;
case D_DIFFER:
if (diff_format == D_BRIEF)
printf("Files %s%s and %s%s differ\n",
path1, entry, path2, entry);
break;
case D_SAME:
if (sflag)
printf("Files %s%s and %s%s are identical\n",
path1, entry, path2, entry);
break;
case D_MISMATCH1:
printf("File %s%s is a directory while file %s%s is a regular file\n",
path1, entry, path2, entry);
break;
case D_MISMATCH2:
printf("File %s%s is a regular file while file %s%s is a directory\n",
path1, entry, path2, entry);
break;
case D_SKIPPED1:
printf("File %s%s is not a regular file or directory and was skipped\n",
path1, entry);
break;
case D_SKIPPED2:
printf("File %s%s is not a regular file or directory and was skipped\n",
path2, entry);
break;
}
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: diff [-abdipTtw] [-c | -e | -f | -n | -q | -u] [-I pattern] [-L label]\n"
" file1 file2\n"
" diff [-abdipTtw] [-I pattern] [-L label] -C number file1 file2\n"
" diff [-abditw] [-I pattern] -D string file1 file2\n"
" diff [-abdipTtw] [-I pattern] [-L label] -U number file1 file2\n"
" diff [-abdiNPprsTtw] [-c | -e | -f | -n | -q | -u] [-I pattern]\n"
" [-L label] [-S name] [-X file] [-x pattern] dir1 dir2\n");
exit(2);
}
usr.bin/diff/diff.h
/* $OpenBSD: diff.h,v 1.35 2024/05/21 05:00:48 jsg Exp $ */
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)diff.h 8.1 (Berkeley) 6/6/93
*/
#include <sys/types.h>
#include <regex.h>
/*
* Output format options
*/
#define D_NORMAL 0 /* Normal output */
#define D_EDIT -1 /* Editor script out */
#define D_REVERSE 1 /* Reverse editor script */
#define D_CONTEXT 2 /* Diff with context */
#define D_UNIFIED 3 /* Unified context diff */
#define D_IFDEF 4 /* Diff with merged #ifdef's */
#define D_NREVERSE 5 /* Reverse ed script with numbered
lines and no trailing . */
#define D_BRIEF 6 /* Say if the files differ */
/*
* Output flags
*/
#define D_HEADER 0x001 /* Print a header/footer between files */
#define D_EMPTY1 0x002 /* Treat first file as empty (/dev/null) */
#define D_EMPTY2 0x004 /* Treat second file as empty (/dev/null) */
/*
* Command line flags
*/
#define D_FORCEASCII 0x008 /* Treat file as ascii regardless of content */
#define D_FOLDBLANKS 0x010 /* Treat all white space as equal */
#define D_MINIMAL 0x020 /* Make diff as small as possible */
#define D_IGNORECASE 0x040 /* Case-insensitive matching */
#define D_PROTOTYPE 0x080 /* Display C function prototype */
#define D_EXPANDTABS 0x100 /* Expand tabs to spaces */
#define D_IGNOREBLANKS 0x200 /* Ignore white space changes */
/*
* Status values for print_status() and diffreg() return values
*/
#define D_SAME 0 /* Files are the same */
#define D_DIFFER 1 /* Files are different */
#define D_BINARY 2 /* Binary files are different */
#define D_MISMATCH1 3 /* path1 was a dir, path2 a file */
#define D_MISMATCH2 4 /* path1 was a file, path2 a dir */
#define D_SKIPPED1 5 /* path1 was a special file */
#define D_SKIPPED2 6 /* path2 was a special file */
struct excludes {
char *pattern;
struct excludes *next;
};
extern int Nflag, Pflag, rflag, sflag, Tflag;
extern int diff_format, diff_context, status;
extern char *start, *ifdefname, *diffargs, *label[2], *ignore_pats;
extern struct stat stb1, stb2;
extern struct excludes *excludes_list;
extern regex_t ignore_re;
char *splice(char *, char *);
int diffreg(char *, char *, int);
void diffdir(char *, char *, int);
void print_only(const char *, size_t, const char *);
void print_status(int, char *, char *, const char *);
usr.bin/diff/diffdir.c
/* $OpenBSD: diffdir.c,v 1.47 2019/01/25 00:19:26 millert Exp $ */
/*
* Copyright (c) 2003, 2010 Todd C. Miller <millert@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
#include <sys/stat.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "diff.h"
#include "xmalloc.h"
static int selectfile(const struct dirent *);
static void diffit(struct dirent *, char *, size_t, char *, size_t, int);
#define d_status d_type /* we need to store status for -l */
/*
* Diff directory traversal. Will be called recursively if -r was specified.
*/
void
diffdir(char *p1, char *p2, int flags)
{
struct dirent *dent1, **dp1, **edp1 = NULL, **dirp1 = NULL;
struct dirent *dent2, **dp2, **edp2 = NULL, **dirp2 = NULL;
size_t dirlen1, dirlen2;
char path1[PATH_MAX], path2[PATH_MAX];
int pos;
dirlen1 = strlcpy(path1, *p1 ? p1 : ".", sizeof(path1));
if (dirlen1 >= sizeof(path1) - 1) {
warnc(ENAMETOOLONG, "%s", p1);
status |= 2;
return;
}
if (path1[dirlen1 - 1] != '/') {
path1[dirlen1++] = '/';
path1[dirlen1] = '\0';
}
dirlen2 = strlcpy(path2, *p2 ? p2 : ".", sizeof(path2));
if (dirlen2 >= sizeof(path2) - 1) {
warnc(ENAMETOOLONG, "%s", p2);
status |= 2;
return;
}
if (path2[dirlen2 - 1] != '/') {
path2[dirlen2++] = '/';
path2[dirlen2] = '\0';
}
/*
* Get a list of entries in each directory, skipping "excluded" files
* and sorting alphabetically.
*/
pos = scandir(path1, &dirp1, selectfile, alphasort);
if (pos == -1) {
if (errno == ENOENT && (Nflag || Pflag)) {
pos = 0;
} else {
warn("%s", path1);
goto closem;
}
}
dp1 = dirp1;
edp1 = dirp1 + pos;
pos = scandir(path2, &dirp2, selectfile, alphasort);
if (pos == -1) {
if (errno == ENOENT && Nflag) {
pos = 0;
} else {
warn("%s", path2);
goto closem;
}
}
dp2 = dirp2;
edp2 = dirp2 + pos;
/*
* If we were given a starting point, find it.
*/
if (start != NULL) {
while (dp1 != edp1 && strcmp((*dp1)->d_name, start) < 0)
dp1++;
while (dp2 != edp2 && strcmp((*dp2)->d_name, start) < 0)
dp2++;
}
/*
* Iterate through the two directory lists, diffing as we go.
*/
while (dp1 != edp1 || dp2 != edp2) {
dent1 = dp1 != edp1 ? *dp1 : NULL;
dent2 = dp2 != edp2 ? *dp2 : NULL;
pos = dent1 == NULL ? 1 : dent2 == NULL ? -1 :
strcmp(dent1->d_name, dent2->d_name);
if (pos == 0) {
/* file exists in both dirs, diff it */
diffit(dent1, path1, dirlen1, path2, dirlen2, flags);
dp1++;
dp2++;
} else if (pos < 0) {
/* file only in first dir, only diff if -N */
if (Nflag) {
diffit(dent1, path1, dirlen1, path2, dirlen2,
flags);
} else {
print_only(path1, dirlen1, dent1->d_name);
status |= 1;
}
dp1++;
} else {
/* file only in second dir, only diff if -N or -P */
if (Nflag || Pflag) {
diffit(dent2, path1, dirlen1, path2, dirlen2,
flags);
} else {
print_only(path2, dirlen2, dent2->d_name);
status |= 1;
}
dp2++;
}
}
closem:
if (dirp1 != NULL) {
for (dp1 = dirp1; dp1 < edp1; dp1++)
free(*dp1);
free(dirp1);
}
if (dirp2 != NULL) {
for (dp2 = dirp2; dp2 < edp2; dp2++)
free(*dp2);
free(dirp2);
}
}
/*
* Do the actual diff by calling either diffreg() or diffdir().
*/
static void
diffit(struct dirent *dp, char *path1, size_t plen1, char *path2, size_t plen2,
int flags)
{
flags |= D_HEADER;
strlcpy(path1 + plen1, dp->d_name, PATH_MAX - plen1);
if (stat(path1, &stb1) != 0) {
if (!(Nflag || Pflag) || errno != ENOENT) {
warn("%s", path1);
return;
}
flags |= D_EMPTY1;
memset(&stb1, 0, sizeof(stb1));
}
strlcpy(path2 + plen2, dp->d_name, PATH_MAX - plen2);
if (stat(path2, &stb2) != 0) {
if (!Nflag || errno != ENOENT) {
warn("%s", path2);
return;
}
flags |= D_EMPTY2;
memset(&stb2, 0, sizeof(stb2));
stb2.st_mode = stb1.st_mode;
}
if (stb1.st_mode == 0)
stb1.st_mode = stb2.st_mode;
if (S_ISDIR(stb1.st_mode) && S_ISDIR(stb2.st_mode)) {
if (rflag)
diffdir(path1, path2, flags);
else
printf("Common subdirectories: %s and %s\n",
path1, path2);
return;
}
if (!S_ISREG(stb1.st_mode) && !S_ISDIR(stb1.st_mode))
dp->d_status = D_SKIPPED1;
else if (!S_ISREG(stb2.st_mode) && !S_ISDIR(stb2.st_mode))
dp->d_status = D_SKIPPED2;
else
dp->d_status = diffreg(path1, path2, flags);
print_status(dp->d_status, path1, path2, "");
}
/*
* Returns 1 if the directory entry should be included in the
* diff, else 0. Checks the excludes list.
*/
static int
selectfile(const struct dirent *dp)
{
struct excludes *excl;
if (dp->d_fileno == 0)
return (0);
/* always skip "." and ".." */
if (dp->d_name[0] == '.' && (dp->d_name[1] == '\0' ||
(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
return (0);
/* check excludes list */
for (excl = excludes_list; excl != NULL; excl = excl->next)
if (fnmatch(excl->pattern, dp->d_name, FNM_PATHNAME) == 0)
return (0);
return (1);
}
usr.bin/diff/diffreg.c
/* $OpenBSD: diffreg.c,v 1.95 2021/10/24 21:24:16 deraadt Exp $ */
/*
* Copyright (C) Caldera International Inc. 2001-2002.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code and documentation must retain the above
* copyright notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed or owned by Caldera
* International, Inc.
* 4. Neither the name of Caldera International, Inc. nor the names of other
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
* INTERNATIONAL, INC. AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE FOR ANY DIRECT,
* INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)diffreg.c 8.1 (Berkeley) 6/6/93
*/
#include <sys/stat.h>
#include <sys/wait.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include "diff.h"
#include "xmalloc.h"
#define MINIMUM(a, b) (((a) < (b)) ? (a) : (b))
#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
/*
* diff - compare two files.
*/
/*
* Uses an algorithm due to Harold Stone, which finds
* a pair of longest identical subsequences in the two
* files.
*
* The major goal is to generate the match vector J.
* J[i] is the index of the line in file1 corresponding
* to line i file0. J[i] = 0 if there is no
* such line in file1.
*
* Lines are hashed so as to work in core. All potential
* matches are located by sorting the lines of each file
* on the hash (called ``value''). In particular, this
* collects the equivalence classes in file1 together.
* Subroutine equiv replaces the value of each line in
* file0 by the index of the first element of its
* matching equivalence in (the reordered) file1.
* To save space equiv squeezes file1 into a single
* array member in which the equivalence classes
* are simply concatenated, except that their first
* members are flagged by changing sign.
*
* Next the indices that point into member are unsorted into
* array class according to the original order of file0.
*
* The cleverness lies in routine stone. This marches
* through the lines of file0, developing a vector klist
* of "k-candidates". At step i a k-candidate is a matched
* pair of lines x,y (x in file0 y in file1) such that
* there is a common subsequence of length k
* between the first i lines of file0 and the first y
* lines of file1, but there is no such subsequence for
* any smaller y. x is the earliest possible mate to y
* that occurs in such a subsequence.
*
* Whenever any of the members of the equivalence class of
* lines in file1 matable to a line in file0 has serial number
* less than the y of some k-candidate, that k-candidate
* with the smallest such y is replaced. The new
* k-candidate is chained (via pred) to the current
* k-1 candidate so that the actual subsequence can
* be recovered. When a member has serial number greater
* that the y of all k-candidates, the klist is extended.
* At the end, the longest subsequence is pulled out
* and placed in the array J by unravel
*
* With J in hand, the matches there recorded are
* check'ed against reality to assure that no spurious
* matches have crept in due to hashing. If they have,
* they are broken, and "jackpot" is recorded--a harmless
* matter except that a true match for a spuriously
* mated line may now be unnecessarily reported as a change.
*
* Much of the complexity of the program comes simply
* from trying to minimize core utilization and
* maximize the range of doable problems by dynamically
* allocating what is needed and reusing what is not.
* The core requirements for problems larger than somewhat
* are (in words) 2*length(file0) + length(file1) +
* 3*(number of k-candidates installed), typically about
* 6n words for files of length n.
*/
struct cand {
int x;
int y;
int pred;
};
struct line {
int serial;
int value;
} *file[2];
/*
* The following struct is used to record change information when
* doing a "context" or "unified" diff. (see routine "change" to
* understand the highly mnemonic field names)
*/
struct context_vec {
int a; /* start line in old file */
int b; /* end line in old file */
int c; /* start line in new file */
int d; /* end line in new file */
};
#define diff_output printf
static FILE *opentemp(const char *);
static void output(char *, FILE *, char *, FILE *, int);
static void check(FILE *, FILE *, int);
static void range(int, int, const char *);
static void uni_range(int, int);
static void dump_context_vec(FILE *, FILE *, int);
static void dump_unified_vec(FILE *, FILE *, int);
static void prepare(int, FILE *, size_t, int);
static void prune(void);
static void equiv(struct line *, int, struct line *, int, int *);
static void unravel(int);
static void unsort(struct line *, int, int *);
static void change(char *, FILE *, char *, FILE *, int, int, int, int, int *);
static void sort(struct line *, int);
static void print_header(const char *, const char *);
static int ignoreline(char *);
static int asciifile(FILE *);
static int fetch(long *, int, int, FILE *, int, int, int);
static int newcand(int, int, int);
static int search(int *, int, int);
static int skipline(FILE *);
static int isqrt(int);
static int stone(int *, int, int *, int *, int);
static int readhash(FILE *, int);
static int files_differ(FILE *, FILE *, int);
static char *match_function(const long *, int, FILE *);
static char *preadline(int, size_t, off_t);
static int *J; /* will be overlaid on class */
static int *class; /* will be overlaid on file[0] */
static int *klist; /* will be overlaid on file[0] after class */
static int *member; /* will be overlaid on file[1] */
... This diff was truncated because it exceeds the maximum size that can be displayed.
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