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/*
* diff.c - diff specific util functions
* Copyright (C) 2001, 2002 Tim Waugh <twaugh@redhat.com>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif /* HAVE_SYS_TYPES_H */
#include <fnmatch.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "util.h"
int num_pathname_components (const char *x)
{
int num = 0;
while ((x = strchr (x, '/')) != NULL) {
while (*x == '/')
x++;
num++;
}
return num;
}
/*
* Find the best name from a list.
*
* Of the names with the fewest path name components, select the
* one with the shortest base name. Of any remaining candidates,
* select the one with the shortest name.
*
*/
char *best_name (int n, char **names)
{
int *pathname_components;
int *basename_length;
int best_pn, best_bn, best_n, best = 0; /* shut gcc up */
int i;
pathname_components = xmalloc (sizeof (int *) * n);
basename_length = xmalloc (sizeof (int *) * n);
best_pn = -1;
for (i = 0; i < n; i++) {
if (!strcmp (names[i], "/dev/null"))
continue;
pathname_components[i] = num_pathname_components (names[i]);
if ((best_pn == -1) ||
(pathname_components[i] < best_pn))
best_pn = pathname_components[i];
}
best_bn = -1;
for (i = 0; i < n; i++) {
char *p;
if (!strcmp (names[i], "/dev/null"))
continue;
if (pathname_components[i] != best_pn)
continue;
p = strrchr (names[i], '/');
if (p)
p++;
else
p = names[i];
basename_length[i] = strlen (p);
if ((best_bn == -1) ||
(basename_length[i] < best_bn))
best_bn = basename_length[i];
}
best_n = -1;
for (i = 0; i < n; i++) {
int len;
if (basename_length[i] != best_bn)
continue;
len = strlen (names[i]);
if ((best_n == -1) ||
(len < best_n)) {
best_n = len;
best = i;
}
}
free (pathname_components);
free (basename_length);
return names[best];
}
unsigned long calculate_num_lines (const char *atatline, char which)
{
char *p = strchr (atatline, which);
if (!p)
return 1;
while (*p && *p != ',' && *p != ' ') p++;
if (!*p || *p == ' ')
return 1;
return strtoul (p + 1, NULL, 10);
}
unsigned long orig_num_lines (const char *atatline)
{
return calculate_num_lines (atatline, '-');
}
unsigned long new_num_lines (const char *atatline)
{
return calculate_num_lines (atatline, '+');
}
/* Parse an @@ line. */
int read_atatline (const char *atatline,
unsigned long *orig_offset,
unsigned long *orig_count,
unsigned long *new_offset,
unsigned long *new_count)
{
char *endptr;
unsigned long res;
char *p;
if (orig_offset) {
p = strchr (atatline, '-');
if (!p)
return 1;
p++;
res = strtoul (p, &endptr, 0);
if (p == endptr)
return 1;
*orig_offset = res;
}
if (orig_count)
*orig_count = orig_num_lines (atatline);
if (new_offset) {
p = strchr (atatline, '+');
if (!p)
return 1;
p++;
res = strtoul (p, &endptr, 0);
if (p == endptr)
return 1;
*new_offset = res;
}
if (new_count)
*new_count = new_num_lines (atatline);
return 0;
}
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