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/* $Copyright: $
* Copyright (c) 1996 - 2026 by Steve Baker (steve.baker.llc@gmail.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
*/
#include "tree.h"
extern char *file_pathsep;
/**
* Like strpcat, but also has the start and end of the buffer being written to
* to bound access. Attempts to eliminate repeated path separators.
*/
char *pathnpcat(char *dst, char *src, char *start, char *end)
{
while (dst < end && *src) {
// Don't allow / repeats:
if (dst > start && strchr(file_pathsep, *(dst-1)) != NULL && strchr(file_pathsep, *src) != NULL) {
src++;
continue;
}
*(dst++) = *(src++);
}
*dst = '\0';
return dst;
}
/**
* Concatenates variable number of paths together, attempting to eliminate
* repeated path separators. Argument list terminated with a NULL. Path is
* returned in a static buffer, so must be scopy'ed if it's necessary to
* preserve it.
*/
char *pathconcat(char *str, ...)
{
static char buf[PATH_MAX+1];
char *p, *s, *limit = buf + PATH_MAX;
// If str == buf, then we're appending to the path already in buf:
if (str == buf) {
p = strchr(buf, '\0');
} else {
buf[0] = 0;
p = pathnpcat(buf, str, buf, limit);
}
va_list ap;
va_start(ap, str);
while ((s = va_arg(ap, char *)) != NULL) {
p = pathnpcat(p, file_pathsep, buf, limit);
p = pathnpcat(p, s, buf, limit);
if (p == limit) break;
}
va_end(ap);
return buf;
}
/**
* Returns true if the directory is a singleton (has exactly one child that is
* itself a directory.)
*/
bool is_singleton(struct _info *dir)
{
if (dir->child == NULL) return false;
if (dir->child[0] == NULL) return false;
if (dir->child[1] != NULL) return false;
return dir->child[0]->isdir;
}
void *xmalloc (size_t size)
{
register void *value = malloc (size);
if (value == NULL) {
fprintf(stderr,"tree: virtual memory exhausted.\n");
exit(1);
}
return value;
}
void *xrealloc (void *ptr, size_t size)
{
register void *value = realloc (ptr,size);
if (value == NULL) {
fprintf(stderr,"tree: virtual memory exhausted.\n");
exit(1);
}
return value;
}
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