1002 lines
26 KiB
C
1002 lines
26 KiB
C
/* GNU DIFF main routine.
|
||
Copyright (C) 1988, 1989, 1992, 1993 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. */
|
||
|
||
#ifndef lint
|
||
static char *rcsid = "$Id: diff.c,v 1.6 1993/11/12 02:25:55 jtc Exp $";
|
||
#endif
|
||
|
||
/* GNU DIFF was written by Mike Haertel, David Hayes,
|
||
Richard Stallman, Len Tower, and Paul Eggert. */
|
||
|
||
#define GDIFF_MAIN
|
||
#include "diff.h"
|
||
#include "getopt.h"
|
||
#include "fnmatch.h"
|
||
|
||
#ifndef DEFAULT_WIDTH
|
||
#define DEFAULT_WIDTH 130
|
||
#endif
|
||
|
||
#ifndef GUTTER_WIDTH_MINIMUM
|
||
#define GUTTER_WIDTH_MINIMUM 3
|
||
#endif
|
||
|
||
static char const *filetype PARAMS((struct stat const *));
|
||
static char *option_list PARAMS((char **, int));
|
||
static int add_exclude_file PARAMS((char const *));
|
||
static int ck_atoi PARAMS((char const *, int *));
|
||
static int compare_files PARAMS((char const *, char const *, char const *, char const *, int));
|
||
static int specify_format PARAMS((char **, char *));
|
||
static void add_exclude PARAMS((char const *));
|
||
static void add_regexp PARAMS((struct regexp_list **, char const *));
|
||
static void specify_style PARAMS((enum output_style));
|
||
static void usage PARAMS((char const *));
|
||
|
||
/* Nonzero for -r: if comparing two directories,
|
||
compare their common subdirectories recursively. */
|
||
|
||
static int recursive;
|
||
|
||
/* For debugging: don't do discard_confusing_lines. */
|
||
|
||
int no_discards;
|
||
|
||
/* Return a string containing the command options with which diff was invoked.
|
||
Spaces appear between what were separate ARGV-elements.
|
||
There is a space at the beginning but none at the end.
|
||
If there were no options, the result is an empty string.
|
||
|
||
Arguments: OPTIONVEC, a vector containing separate ARGV-elements, and COUNT,
|
||
the length of that vector. */
|
||
|
||
static char *
|
||
option_list (optionvec, count)
|
||
char **optionvec; /* Was `vector', but that collides on Alliant. */
|
||
int count;
|
||
{
|
||
int i;
|
||
size_t length = 0;
|
||
char *result;
|
||
|
||
for (i = 0; i < count; i++)
|
||
length += strlen (optionvec[i]) + 1;
|
||
|
||
result = xmalloc (length + 1);
|
||
result[0] = 0;
|
||
|
||
for (i = 0; i < count; i++)
|
||
{
|
||
strcat (result, " ");
|
||
strcat (result, optionvec[i]);
|
||
}
|
||
|
||
return result;
|
||
}
|
||
|
||
/* Convert STR to a positive integer, storing the result in *OUT.
|
||
If STR is not a valid integer, return -1 (otherwise 0). */
|
||
static int
|
||
ck_atoi (str, out)
|
||
char const *str;
|
||
int *out;
|
||
{
|
||
char const *p;
|
||
for (p = str; *p; p++)
|
||
if (*p < '0' || *p > '9')
|
||
return -1;
|
||
|
||
*out = atoi (optarg);
|
||
return 0;
|
||
}
|
||
|
||
/* Keep track of excluded file name patterns. */
|
||
|
||
static char const **exclude;
|
||
static int exclude_alloc, exclude_count;
|
||
|
||
int
|
||
excluded_filename (f)
|
||
char const *f;
|
||
{
|
||
int i;
|
||
for (i = 0; i < exclude_count; i++)
|
||
if (fnmatch (exclude[i], f, 0) == 0)
|
||
return 1;
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
add_exclude (pattern)
|
||
char const *pattern;
|
||
{
|
||
if (exclude_alloc <= exclude_count)
|
||
exclude = (char const **)
|
||
(exclude_alloc == 0
|
||
? xmalloc ((exclude_alloc = 64) * sizeof (*exclude))
|
||
: xrealloc (exclude, (exclude_alloc *= 2) * sizeof (*exclude)));
|
||
|
||
exclude[exclude_count++] = pattern;
|
||
}
|
||
|
||
static int
|
||
add_exclude_file (name)
|
||
char const *name;
|
||
{
|
||
struct file_data f;
|
||
char *p, *q, *lim;
|
||
|
||
f.name = optarg;
|
||
f.desc = (strcmp (optarg, "-") == 0
|
||
? STDIN_FILENO
|
||
: open (optarg, O_RDONLY, 0));
|
||
if (f.desc < 0 || fstat (f.desc, &f.stat) != 0)
|
||
return -1;
|
||
|
||
sip (&f, 1);
|
||
slurp (&f);
|
||
|
||
for (p = f.buffer, lim = p + f.buffered_chars; p < lim; p = q)
|
||
{
|
||
q = (char *) memchr (p, '\n', lim - p);
|
||
if (!q)
|
||
q = lim;
|
||
*q++ = 0;
|
||
add_exclude (p);
|
||
}
|
||
|
||
return close (f.desc);
|
||
}
|
||
|
||
/* The numbers 129- that appear in the fourth element of some entries
|
||
tell the big switch in `main' how to process those options. */
|
||
|
||
static struct option const longopts[] =
|
||
{
|
||
{"ignore-blank-lines", 0, 0, 'B'},
|
||
{"context", 2, 0, 'C'},
|
||
{"ifdef", 1, 0, 'D'},
|
||
{"show-function-line", 1, 0, 'F'},
|
||
{"speed-large-files", 0, 0, 'H'},
|
||
{"ignore-matching-lines", 1, 0, 'I'},
|
||
{"label", 1, 0, 'L'},
|
||
{"file-label", 1, 0, 'L'}, /* An alias, no longer recommended */
|
||
{"new-file", 0, 0, 'N'},
|
||
{"entire-new-file", 0, 0, 'N'}, /* An alias, no longer recommended */
|
||
{"unidirectional-new-file", 0, 0, 'P'},
|
||
{"starting-file", 1, 0, 'S'},
|
||
{"initial-tab", 0, 0, 'T'},
|
||
{"width", 1, 0, 'W'},
|
||
{"text", 0, 0, 'a'},
|
||
{"ascii", 0, 0, 'a'}, /* An alias, no longer recommended */
|
||
{"ignore-space-change", 0, 0, 'b'},
|
||
{"minimal", 0, 0, 'd'},
|
||
{"ed", 0, 0, 'e'},
|
||
{"forward-ed", 0, 0, 'f'},
|
||
{"ignore-case", 0, 0, 'i'},
|
||
{"paginate", 0, 0, 'l'},
|
||
{"print", 0, 0, 'l'}, /* An alias, no longer recommended */
|
||
{"rcs", 0, 0, 'n'},
|
||
{"show-c-function", 0, 0, 'p'},
|
||
{"binary", 0, 0, 'q'}, /* An alias, no longer recommended */
|
||
{"brief", 0, 0, 'q'},
|
||
{"recursive", 0, 0, 'r'},
|
||
{"report-identical-files", 0, 0, 's'},
|
||
{"expand-tabs", 0, 0, 't'},
|
||
{"version", 0, 0, 'v'},
|
||
{"ignore-all-space", 0, 0, 'w'},
|
||
{"exclude", 1, 0, 'x'},
|
||
{"exclude-from", 1, 0, 'X'},
|
||
{"side-by-side", 0, 0, 'y'},
|
||
{"unified", 2, 0, 'U'},
|
||
{"left-column", 0, 0, 129},
|
||
{"suppress-common-lines", 0, 0, 130},
|
||
{"sdiff-merge-assist", 0, 0, 131},
|
||
{"old-line-format", 1, 0, 132},
|
||
{"new-line-format", 1, 0, 133},
|
||
{"unchanged-line-format", 1, 0, 134},
|
||
{"line-format", 1, 0, 135},
|
||
{"old-group-format", 1, 0, 136},
|
||
{"new-group-format", 1, 0, 137},
|
||
{"unchanged-group-format", 1, 0, 138},
|
||
{"changed-group-format", 1, 0, 139},
|
||
{"horizon-lines", 1, 0, 140},
|
||
{"help", 0, 0, 141},
|
||
{0, 0, 0, 0}
|
||
};
|
||
|
||
int
|
||
main (argc, argv)
|
||
int argc;
|
||
char *argv[];
|
||
{
|
||
int val;
|
||
int c;
|
||
int prev = -1;
|
||
int width = DEFAULT_WIDTH;
|
||
|
||
/* Do our initializations. */
|
||
program = argv[0];
|
||
output_style = OUTPUT_NORMAL;
|
||
context = -1;
|
||
line_end_char = '\n';
|
||
|
||
/* Decode the options. */
|
||
|
||
while ((c = getopt_long (argc, argv,
|
||
"0123456789abBcC:dD:efF:hHiI:lL:nNpPqrsS:tTuU:vwW:x:X:y",
|
||
longopts, 0)) != EOF)
|
||
{
|
||
switch (c)
|
||
{
|
||
/* All digits combine in decimal to specify the context-size. */
|
||
case '1':
|
||
case '2':
|
||
case '3':
|
||
case '4':
|
||
case '5':
|
||
case '6':
|
||
case '7':
|
||
case '8':
|
||
case '9':
|
||
case '0':
|
||
if (context == -1)
|
||
context = 0;
|
||
/* If a context length has already been specified,
|
||
more digits allowed only if they follow right after the others.
|
||
Reject two separate runs of digits, or digits after -C. */
|
||
else if (prev < '0' || prev > '9')
|
||
fatal ("context length specified twice");
|
||
|
||
context = context * 10 + c - '0';
|
||
break;
|
||
|
||
case 'a':
|
||
/* Treat all files as text files; never treat as binary. */
|
||
always_text_flag = 1;
|
||
break;
|
||
|
||
case 'b':
|
||
/* Ignore changes in amount of white space. */
|
||
ignore_space_change_flag = 1;
|
||
length_varies = 1;
|
||
ignore_some_changes = 1;
|
||
break;
|
||
|
||
case 'B':
|
||
/* Ignore changes affecting only blank lines. */
|
||
ignore_blank_lines_flag = 1;
|
||
ignore_some_changes = 1;
|
||
break;
|
||
|
||
case 'C': /* +context[=lines] */
|
||
case 'U': /* +unified[=lines] */
|
||
if (optarg)
|
||
{
|
||
if (context >= 0)
|
||
fatal ("context length specified twice");
|
||
|
||
if (ck_atoi (optarg, &context))
|
||
fatal ("invalid context length argument");
|
||
}
|
||
|
||
/* Falls through. */
|
||
case 'c':
|
||
/* Make context-style output. */
|
||
specify_style (c == 'U' ? OUTPUT_UNIFIED : OUTPUT_CONTEXT);
|
||
break;
|
||
|
||
case 'd':
|
||
/* Don't discard lines. This makes things slower (sometimes much
|
||
slower) but will find a guaranteed minimal set of changes. */
|
||
no_discards = 1;
|
||
break;
|
||
|
||
case 'D':
|
||
/* Make merged #ifdef output. */
|
||
specify_style (OUTPUT_IFDEF);
|
||
{
|
||
int i, err = 0;
|
||
static char const C_ifdef_group_formats[] =
|
||
"#ifndef %s\n%%<#endif /* not %s */\n%c#ifdef %s\n%%>#endif /* %s */\n%c%%=%c#ifndef %s\n%%<#else /* %s */\n%%>#endif /* %s */\n";
|
||
char *b = xmalloc (sizeof (C_ifdef_group_formats)
|
||
+ 7 * strlen(optarg) - 14 /* 7*"%s" */
|
||
- 8 /* 5*"%%" + 3*"%c" */);
|
||
sprintf (b, C_ifdef_group_formats,
|
||
optarg, optarg, 0,
|
||
optarg, optarg, 0, 0,
|
||
optarg, optarg, optarg);
|
||
for (i = 0; i < 4; i++)
|
||
{
|
||
err |= specify_format (&group_format[i], b);
|
||
b += strlen (b) + 1;
|
||
}
|
||
if (err)
|
||
error ("conflicting #ifdef formats", 0, 0);
|
||
}
|
||
break;
|
||
|
||
case 'e':
|
||
/* Make output that is a valid `ed' script. */
|
||
specify_style (OUTPUT_ED);
|
||
break;
|
||
|
||
case 'f':
|
||
/* Make output that looks vaguely like an `ed' script
|
||
but has changes in the order they appear in the file. */
|
||
specify_style (OUTPUT_FORWARD_ED);
|
||
break;
|
||
|
||
case 'F':
|
||
/* Show, for each set of changes, the previous line that
|
||
matches the specified regexp. Currently affects only
|
||
context-style output. */
|
||
add_regexp (&function_regexp_list, optarg);
|
||
break;
|
||
|
||
case 'h':
|
||
/* Split the files into chunks of around 1500 lines
|
||
for faster processing. Usually does not change the result.
|
||
|
||
This currently has no effect. */
|
||
break;
|
||
|
||
case 'H':
|
||
/* Turn on heuristics that speed processing of large files
|
||
with a small density of changes. */
|
||
heuristic = 1;
|
||
break;
|
||
|
||
case 'i':
|
||
/* Ignore changes in case. */
|
||
ignore_case_flag = 1;
|
||
ignore_some_changes = 1;
|
||
break;
|
||
|
||
case 'I':
|
||
/* Ignore changes affecting only lines that match the
|
||
specified regexp. */
|
||
add_regexp (&ignore_regexp_list, optarg);
|
||
ignore_some_changes = 1;
|
||
break;
|
||
|
||
case 'l':
|
||
/* Pass the output through `pr' to paginate it. */
|
||
paginate_flag = 1;
|
||
break;
|
||
|
||
case 'L':
|
||
/* Specify file labels for `-c' output headers. */
|
||
if (!file_label[0])
|
||
file_label[0] = optarg;
|
||
else if (!file_label[1])
|
||
file_label[1] = optarg;
|
||
else
|
||
fatal ("too many file label options");
|
||
break;
|
||
|
||
case 'n':
|
||
/* Output RCS-style diffs, like `-f' except that each command
|
||
specifies the number of lines affected. */
|
||
specify_style (OUTPUT_RCS);
|
||
break;
|
||
|
||
case 'N':
|
||
/* When comparing directories, if a file appears only in one
|
||
directory, treat it as present but empty in the other. */
|
||
entire_new_file_flag = 1;
|
||
break;
|
||
|
||
case 'p':
|
||
/* Make context-style output and show name of last C function. */
|
||
specify_style (OUTPUT_CONTEXT);
|
||
add_regexp (&function_regexp_list, "^[_a-zA-Z$]");
|
||
break;
|
||
|
||
case 'P':
|
||
/* When comparing directories, if a file appears only in
|
||
the second directory of the two,
|
||
treat it as present but empty in the other. */
|
||
unidirectional_new_file_flag = 1;
|
||
break;
|
||
|
||
case 'q':
|
||
no_details_flag = 1;
|
||
break;
|
||
|
||
case 'r':
|
||
/* When comparing directories,
|
||
recursively compare any subdirectories found. */
|
||
recursive = 1;
|
||
break;
|
||
|
||
case 's':
|
||
/* Print a message if the files are the same. */
|
||
print_file_same_flag = 1;
|
||
break;
|
||
|
||
case 'S':
|
||
/* When comparing directories, start with the specified
|
||
file name. This is used for resuming an aborted comparison. */
|
||
dir_start_file = optarg;
|
||
break;
|
||
|
||
case 't':
|
||
/* Expand tabs to spaces in the output so that it preserves
|
||
the alignment of the input files. */
|
||
tab_expand_flag = 1;
|
||
break;
|
||
|
||
case 'T':
|
||
/* Use a tab in the output, rather than a space, before the
|
||
text of an input line, so as to keep the proper alignment
|
||
in the input line without changing the characters in it. */
|
||
tab_align_flag = 1;
|
||
break;
|
||
|
||
case 'u':
|
||
/* Output the context diff in unidiff format. */
|
||
specify_style (OUTPUT_UNIFIED);
|
||
break;
|
||
|
||
case 'v':
|
||
printf ("GNU diff version %s\n", version_string);
|
||
exit (0);
|
||
|
||
case 'w':
|
||
/* Ignore horizontal white space when comparing lines. */
|
||
ignore_all_space_flag = 1;
|
||
ignore_some_changes = 1;
|
||
length_varies = 1;
|
||
break;
|
||
|
||
case 'x':
|
||
add_exclude (optarg);
|
||
break;
|
||
|
||
case 'X':
|
||
if (add_exclude_file (optarg) != 0)
|
||
pfatal_with_name (optarg);
|
||
break;
|
||
|
||
case 'y':
|
||
/* Use side-by-side (sdiff-style) columnar output. */
|
||
specify_style (OUTPUT_SDIFF);
|
||
break;
|
||
|
||
case 'W':
|
||
/* Set the line width for OUTPUT_SDIFF. */
|
||
if (ck_atoi (optarg, &width) || width <= 0)
|
||
fatal ("column width must be a positive integer");
|
||
break;
|
||
|
||
case 129:
|
||
sdiff_left_only = 1;
|
||
break;
|
||
|
||
case 130:
|
||
sdiff_skip_common_lines = 1;
|
||
break;
|
||
|
||
case 131:
|
||
/* sdiff-style columns output. */
|
||
specify_style (OUTPUT_SDIFF);
|
||
sdiff_help_sdiff = 1;
|
||
break;
|
||
|
||
case 132:
|
||
case 133:
|
||
case 134:
|
||
specify_style (OUTPUT_IFDEF);
|
||
if (specify_format (&line_format[c - 132], optarg) != 0)
|
||
error ("conflicting line format", 0, 0);
|
||
break;
|
||
|
||
case 135:
|
||
specify_style (OUTPUT_IFDEF);
|
||
{
|
||
int i, err = 0;
|
||
for (i = 0; i < sizeof (line_format) / sizeof (*line_format); i++)
|
||
err |= specify_format (&line_format[i], optarg);
|
||
if (err)
|
||
error ("conflicting line format", 0, 0);
|
||
}
|
||
break;
|
||
|
||
case 136:
|
||
case 137:
|
||
case 138:
|
||
case 139:
|
||
specify_style (OUTPUT_IFDEF);
|
||
if (specify_format (&group_format[c - 136], optarg) != 0)
|
||
error ("conflicting group format", 0, 0);
|
||
break;
|
||
|
||
case 140:
|
||
if (ck_atoi (optarg, &horizon_lines) || horizon_lines < 0)
|
||
fatal ("horizon must be a nonnegative integer");
|
||
break;
|
||
|
||
case 141:
|
||
usage (0);
|
||
|
||
default:
|
||
usage ("");
|
||
}
|
||
prev = c;
|
||
}
|
||
|
||
if (optind != argc - 2)
|
||
usage (optind < argc - 2 ? "extra operand" : "missing operand");
|
||
|
||
|
||
{
|
||
/*
|
||
* We maximize first the half line width, and then the gutter width,
|
||
* according to the following constraints:
|
||
* 1. Two half lines plus a gutter must fit in a line.
|
||
* 2. If the half line width is nonzero:
|
||
* a. The gutter width is at least GUTTER_WIDTH_MINIMUM.
|
||
* b. If tabs are not expanded to spaces,
|
||
* a half line plus a gutter is an integral number of tabs,
|
||
* so that tabs in the right column line up.
|
||
*/
|
||
int t = tab_expand_flag ? 1 : TAB_WIDTH;
|
||
int off = (width + t + GUTTER_WIDTH_MINIMUM) / (2*t) * t;
|
||
sdiff_half_width = max (0, min (off - GUTTER_WIDTH_MINIMUM, width - off)),
|
||
sdiff_column2_offset = sdiff_half_width ? off : width;
|
||
}
|
||
|
||
if (output_style != OUTPUT_CONTEXT && output_style != OUTPUT_UNIFIED)
|
||
context = 0;
|
||
else if (context == -1)
|
||
/* Default amount of context for -c. */
|
||
context = 3;
|
||
|
||
if (output_style == OUTPUT_IFDEF)
|
||
{
|
||
int i;
|
||
for (i = 0; i < sizeof (line_format) / sizeof (*line_format); i++)
|
||
if (!line_format[i])
|
||
line_format[i] = "%l\n";
|
||
if (!group_format[OLD])
|
||
group_format[OLD]
|
||
= group_format[UNCHANGED] ? group_format[UNCHANGED] : "%<";
|
||
if (!group_format[NEW])
|
||
group_format[NEW]
|
||
= group_format[UNCHANGED] ? group_format[UNCHANGED] : "%>";
|
||
if (!group_format[UNCHANGED])
|
||
group_format[UNCHANGED] = "%=";
|
||
if (!group_format[CHANGED])
|
||
group_format[CHANGED] = concat (group_format[OLD],
|
||
group_format[NEW], "");
|
||
}
|
||
|
||
no_diff_means_no_output =
|
||
(output_style == OUTPUT_IFDEF ?
|
||
(!*group_format[UNCHANGED]
|
||
|| (strcmp (group_format[UNCHANGED], "%=") == 0
|
||
&& !*line_format[UNCHANGED]))
|
||
: output_style == OUTPUT_SDIFF ? sdiff_skip_common_lines : 1);
|
||
|
||
switch_string = option_list (argv + 1, optind - 1);
|
||
|
||
val = compare_files (0, argv[optind], 0, argv[optind + 1], 0);
|
||
|
||
/* Print any messages that were saved up for last. */
|
||
print_message_queue ();
|
||
|
||
if (ferror (stdout) || fclose (stdout) != 0)
|
||
fatal ("write error");
|
||
exit (val);
|
||
return val;
|
||
}
|
||
|
||
/* Add the compiled form of regexp PATTERN to REGLIST. */
|
||
|
||
static void
|
||
add_regexp (reglist, pattern)
|
||
struct regexp_list **reglist;
|
||
char const *pattern;
|
||
{
|
||
struct regexp_list *r;
|
||
char const *m;
|
||
|
||
r = (struct regexp_list *) xmalloc (sizeof (*r));
|
||
bzero (r, sizeof (*r));
|
||
r->buf.fastmap = xmalloc (256);
|
||
m = re_compile_pattern (pattern, strlen (pattern), &r->buf);
|
||
if (m != 0)
|
||
error ("%s: %s", pattern, m);
|
||
|
||
/* Add to the start of the list, since it's easier than the end. */
|
||
r->next = *reglist;
|
||
*reglist = r;
|
||
}
|
||
|
||
static void
|
||
usage (reason)
|
||
char const *reason;
|
||
{
|
||
if (reason && *reason)
|
||
fprintf (stderr, "%s: %s\n", program, reason);
|
||
fflush (stderr);
|
||
printf ("Usage: %s [options] from-file to-file\n", program);
|
||
printf ("Options:\n\
|
||
[-abBcdefhHilnNpPqrstTuvwy] [-C lines] [-D name] [-F regexp]\n\
|
||
[-I regexp] [-L from-label [-L to-label]] [-S starting-file] [-U lines]\n\
|
||
[-W columns] [-x pattern] [-X pattern-file]\n");
|
||
printf ("\
|
||
[--brief] [--changed-group-format=format] [--context[=lines]] [--ed]\n\
|
||
[--exclude=pattern] [--exclude-from=pattern-file] [--expand-tabs]\n\
|
||
[--forward-ed] [--help] [--horizon-lines=lines] [--ifdef=name]\n\
|
||
[--ignore-all-space] [--ignore-blank-lines] [--ignore-case]\n");
|
||
printf ("\
|
||
[--ignore-matching-lines=regexp] [--ignore-space-change]\n\
|
||
[--initial-tab] [--label=from-label [--label=to-label]]\n\
|
||
[--left-column] [--minimal] [--new-file] [--new-group-format=format]\n\
|
||
[--new-line-format=format] [--old-group-format=format]\n");
|
||
printf ("\
|
||
[--old-line-format=format] [--paginate] [--rcs] [--recursive]\n\
|
||
[--report-identical-files] [--sdiff-merge-assist] [--show-c-function]\n\
|
||
[--show-function-line=regexp] [--side-by-side] [--speed-large-files]\n\
|
||
[--starting-file=starting-file] [--suppress-common-lines] [--text]\n");
|
||
printf ("\
|
||
[--unchanged-group-format=format] [--unchanged-line-format=format]\n\
|
||
[--unidirectional-new-file] [--unified[=lines]] [--version]\n\
|
||
[--width=columns]\n");
|
||
exit (reason ? 2 : 0);
|
||
}
|
||
|
||
static int
|
||
specify_format (var, value)
|
||
char **var;
|
||
char *value;
|
||
{
|
||
int err = *var ? strcmp (*var, value) : 0;
|
||
*var = value;
|
||
return err;
|
||
}
|
||
|
||
static void
|
||
specify_style (style)
|
||
enum output_style style;
|
||
{
|
||
if (output_style != OUTPUT_NORMAL
|
||
&& output_style != style)
|
||
error ("conflicting specifications of output style", 0, 0);
|
||
output_style = style;
|
||
}
|
||
|
||
static char const *
|
||
filetype (st)
|
||
struct stat const *st;
|
||
{
|
||
/* See Posix.2 section 4.17.6.1.1 and Table 5-1 for these formats.
|
||
To keep diagnostics grammatical, the returned string must start
|
||
with a consonant. */
|
||
|
||
if (S_ISREG (st->st_mode))
|
||
{
|
||
if (st->st_size == 0)
|
||
return "regular empty file";
|
||
/* Posix.2 section 5.14.2 seems to suggest that we must read the file
|
||
and guess whether it's C, Fortran, etc., but this is somewhat useless
|
||
and doesn't reflect historical practice. We're allowed to guess
|
||
wrong, so we don't bother to read the file. */
|
||
return "regular file";
|
||
}
|
||
if (S_ISDIR (st->st_mode)) return "directory";
|
||
|
||
/* other Posix.1 file types */
|
||
#ifdef S_ISBLK
|
||
if (S_ISBLK (st->st_mode)) return "block special file";
|
||
#endif
|
||
#ifdef S_ISCHR
|
||
if (S_ISCHR (st->st_mode)) return "character special file";
|
||
#endif
|
||
#ifdef S_ISFIFO
|
||
if (S_ISFIFO (st->st_mode)) return "fifo";
|
||
#endif
|
||
|
||
/* other popular file types */
|
||
/* S_ISLNK is impossible with `stat'. */
|
||
#ifdef S_ISSOCK
|
||
if (S_ISSOCK (st->st_mode)) return "socket";
|
||
#endif
|
||
|
||
return "weird file";
|
||
}
|
||
|
||
/* Compare two files (or dirs) with specified names
|
||
DIR0/NAME0 and DIR1/NAME1, at level DEPTH in directory recursion.
|
||
(if DIR0 is 0, then the name is just NAME0, etc.)
|
||
This is self-contained; it opens the files and closes them.
|
||
|
||
Value is 0 if files are the same, 1 if different,
|
||
2 if there is a problem opening them. */
|
||
|
||
static int
|
||
compare_files (dir0, name0, dir1, name1, depth)
|
||
char const *dir0, *dir1;
|
||
char const *name0, *name1;
|
||
int depth;
|
||
{
|
||
struct file_data inf[2];
|
||
register int i;
|
||
int val;
|
||
int same_files;
|
||
int failed = 0;
|
||
char *free0 = 0, *free1 = 0;
|
||
|
||
/* If this is directory comparison, perhaps we have a file
|
||
that exists only in one of the directories.
|
||
If so, just print a message to that effect. */
|
||
|
||
if (! ((name0 != 0 && name1 != 0)
|
||
|| (unidirectional_new_file_flag && name1 != 0)
|
||
|| entire_new_file_flag))
|
||
{
|
||
char const *name = name0 == 0 ? name1 : name0;
|
||
char const *dir = name0 == 0 ? dir1 : dir0;
|
||
message ("Only in %s: %s\n", dir, name);
|
||
/* Return 1 so that diff_dirs will return 1 ("some files differ"). */
|
||
return 1;
|
||
}
|
||
|
||
bzero (inf, sizeof (inf));
|
||
|
||
/* Mark any nonexistent file with -1 in the desc field. */
|
||
/* Mark unopened files (e.g. directories) with -2. */
|
||
|
||
inf[0].desc = name0 == 0 ? -1 : -2;
|
||
inf[1].desc = name1 == 0 ? -1 : -2;
|
||
|
||
/* Now record the full name of each file, including nonexistent ones. */
|
||
|
||
if (name0 == 0)
|
||
name0 = name1;
|
||
if (name1 == 0)
|
||
name1 = name0;
|
||
|
||
inf[0].name = dir0 == 0 ? name0 : (free0 = dir_file_pathname (dir0, name0));
|
||
inf[1].name = dir1 == 0 ? name1 : (free1 = dir_file_pathname (dir1, name1));
|
||
|
||
/* Stat the files. Record whether they are directories. */
|
||
|
||
for (i = 0; i <= 1; i++)
|
||
{
|
||
if (inf[i].desc != -1)
|
||
{
|
||
int stat_result;
|
||
|
||
if (i && strcmp (inf[i].name, inf[0].name) == 0)
|
||
{
|
||
inf[i].stat = inf[0].stat;
|
||
stat_result = 0;
|
||
}
|
||
else if (strcmp (inf[i].name, "-") == 0)
|
||
{
|
||
inf[i].desc = STDIN_FILENO;
|
||
stat_result = fstat (STDIN_FILENO, &inf[i].stat);
|
||
if (stat_result == 0 && S_ISREG (inf[i].stat.st_mode))
|
||
{
|
||
off_t pos = lseek (STDIN_FILENO, (off_t) 0, SEEK_CUR);
|
||
if (pos == -1)
|
||
stat_result = -1;
|
||
else
|
||
{
|
||
if (pos <= inf[i].stat.st_size)
|
||
inf[i].stat.st_size -= pos;
|
||
else
|
||
inf[i].stat.st_size = 0;
|
||
/* Posix.2 4.17.6.1.4 requires current time for stdin. */
|
||
time (&inf[i].stat.st_mtime);
|
||
}
|
||
}
|
||
}
|
||
else
|
||
stat_result = stat (inf[i].name, &inf[i].stat);
|
||
|
||
if (stat_result != 0)
|
||
{
|
||
perror_with_name (inf[i].name);
|
||
failed = 1;
|
||
}
|
||
else
|
||
{
|
||
inf[i].dir_p = S_ISDIR (inf[i].stat.st_mode) && inf[i].desc != 0;
|
||
if (inf[1 - i].desc == -1)
|
||
{
|
||
inf[1 - i].dir_p = inf[i].dir_p;
|
||
inf[1 - i].stat.st_mode = inf[i].stat.st_mode;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
if (! failed && depth == 0 && inf[0].dir_p != inf[1].dir_p)
|
||
{
|
||
/* If one is a directory, and it was specified in the command line,
|
||
use the file in that dir with the other file's basename. */
|
||
|
||
int fnm_arg = inf[0].dir_p;
|
||
int dir_arg = 1 - fnm_arg;
|
||
char const *fnm = inf[fnm_arg].name;
|
||
char const *dir = inf[dir_arg].name;
|
||
char const *p = strrchr (fnm, '/');
|
||
char const *filename = inf[dir_arg].name
|
||
= dir_file_pathname (dir, p ? p + 1 : fnm);
|
||
|
||
if (strcmp (fnm, "-") == 0)
|
||
fatal ("can't compare - to a directory");
|
||
|
||
if (stat (filename, &inf[dir_arg].stat) != 0)
|
||
{
|
||
perror_with_name (filename);
|
||
failed = 1;
|
||
}
|
||
else
|
||
inf[dir_arg].dir_p = S_ISDIR (inf[dir_arg].stat.st_mode);
|
||
}
|
||
|
||
if (failed)
|
||
{
|
||
|
||
/* If either file should exist but does not, return 2. */
|
||
|
||
val = 2;
|
||
|
||
}
|
||
else if ((same_files = inf[0].stat.st_ino == inf[1].stat.st_ino
|
||
&& inf[0].stat.st_dev == inf[1].stat.st_dev
|
||
&& inf[0].stat.st_size == inf[1].stat.st_size
|
||
&& inf[0].desc != -1
|
||
&& inf[1].desc != -1)
|
||
&& no_diff_means_no_output)
|
||
{
|
||
/* The two named files are actually the same physical file.
|
||
We know they are identical without actually reading them. */
|
||
|
||
val = 0;
|
||
}
|
||
else if (inf[0].dir_p & inf[1].dir_p)
|
||
{
|
||
if (output_style == OUTPUT_IFDEF)
|
||
fatal ("-D option not supported with directories");
|
||
|
||
/* If both are directories, compare the files in them. */
|
||
|
||
if (depth > 0 && !recursive)
|
||
{
|
||
/* But don't compare dir contents one level down
|
||
unless -r was specified. */
|
||
message ("Common subdirectories: %s and %s\n",
|
||
inf[0].name, inf[1].name);
|
||
val = 0;
|
||
}
|
||
else
|
||
{
|
||
val = diff_dirs (inf, compare_files, depth);
|
||
}
|
||
|
||
}
|
||
else if ((inf[0].dir_p | inf[1].dir_p)
|
||
|| (depth > 0
|
||
&& (! S_ISREG (inf[0].stat.st_mode)
|
||
|| ! S_ISREG (inf[1].stat.st_mode))))
|
||
{
|
||
/* Perhaps we have a subdirectory that exists only in one directory.
|
||
If so, just print a message to that effect. */
|
||
|
||
if (inf[0].desc == -1 || inf[1].desc == -1)
|
||
{
|
||
if ((inf[0].dir_p | inf[1].dir_p)
|
||
&& recursive
|
||
&& (entire_new_file_flag
|
||
|| (unidirectional_new_file_flag && inf[0].desc == -1)))
|
||
val = diff_dirs (inf, compare_files, depth);
|
||
else
|
||
{
|
||
char const *dir = (inf[0].desc == -1) ? dir1 : dir0;
|
||
/* See Posix.2 section 4.17.6.1.1 for this format. */
|
||
message ("Only in %s: %s\n", dir, name0);
|
||
val = 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* We have two files that are not to be compared. */
|
||
|
||
/* See Posix.2 section 4.17.6.1.1 for this format. */
|
||
message5 ("File %s is a %s while file %s is a %s\n",
|
||
inf[0].name, filetype (&inf[0].stat),
|
||
inf[1].name, filetype (&inf[1].stat));
|
||
|
||
/* This is a difference. */
|
||
val = 1;
|
||
}
|
||
}
|
||
else if ((no_details_flag & ~ignore_some_changes)
|
||
&& inf[0].stat.st_size != inf[1].stat.st_size
|
||
&& (inf[0].desc == -1 || S_ISREG (inf[0].stat.st_mode))
|
||
&& (inf[1].desc == -1 || S_ISREG (inf[1].stat.st_mode)))
|
||
{
|
||
message ("Files %s and %s differ\n", inf[0].name, inf[1].name);
|
||
val = 1;
|
||
}
|
||
else
|
||
{
|
||
/* Both exist and neither is a directory. */
|
||
|
||
/* Open the files and record their descriptors. */
|
||
|
||
if (inf[0].desc == -2)
|
||
if ((inf[0].desc = open (inf[0].name, O_RDONLY, 0)) < 0)
|
||
{
|
||
perror_with_name (inf[0].name);
|
||
failed = 1;
|
||
}
|
||
if (inf[1].desc == -2)
|
||
if (same_files)
|
||
inf[1].desc = inf[0].desc;
|
||
else if ((inf[1].desc = open (inf[1].name, O_RDONLY, 0)) < 0)
|
||
{
|
||
perror_with_name (inf[1].name);
|
||
failed = 1;
|
||
}
|
||
|
||
/* Compare the files, if no error was found. */
|
||
|
||
val = failed ? 2 : diff_2_files (inf, depth);
|
||
|
||
/* Close the file descriptors. */
|
||
|
||
if (inf[0].desc >= 0 && close (inf[0].desc) != 0)
|
||
{
|
||
perror_with_name (inf[0].name);
|
||
val = 2;
|
||
}
|
||
if (inf[1].desc >= 0 && inf[0].desc != inf[1].desc
|
||
&& close (inf[1].desc) != 0)
|
||
{
|
||
perror_with_name (inf[1].name);
|
||
val = 2;
|
||
}
|
||
}
|
||
|
||
/* Now the comparison has been done, if no error prevented it,
|
||
and VAL is the value this function will return. */
|
||
|
||
if (val == 0 && !inf[0].dir_p)
|
||
{
|
||
if (print_file_same_flag)
|
||
message ("Files %s and %s are identical\n",
|
||
inf[0].name, inf[1].name);
|
||
}
|
||
else
|
||
fflush (stdout);
|
||
|
||
if (free0)
|
||
free (free0);
|
||
if (free1)
|
||
free (free1);
|
||
|
||
return val;
|
||
}
|