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/*
* libdpkg - Debian packaging suite library routines
* path.c - path handling functions
*
* Copyright © 1995 Ian Jackson <ijackson@chiark.greenend.org.uk>
* Copyright © 2008-2012 Guillem Jover <guillem@debian.org>
*
* This 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 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, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <compat.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <dpkg/dpkg.h>
#include <dpkg/string.h>
#include <dpkg/path.h>
/**
* Trim ‘/’ and ‘/.’ from the end of a pathname.
*
* The given string will get NUL-terminatd.
*
* @param path The pathname to trim.
*
* @return The size of the trimmed pathname.
*/
size_t
path_trim_slash_slashdot(char *path)
{
char *end;
if (str_is_unset(path))
return 0;
for (end = path + strlen(path) - 1; end - path >= 1; end--) {
if (*end == '/' || (*(end - 1) == '/' && *end == '.'))
*end = '\0';
else
break;
}
return end - path + 1;
}
/**
* Skip ‘/’ and ‘./’ from the beginning of a pathname.
*
* @param path The pathname to skip.
*
* @return The new beginning of the pathname.
*/
const char *
path_skip_slash_dotslash(const char *path)
{
while (path[0] == '/' || (path[0] == '.' && path[1] == '/'))
path++;
return path;
}
/**
* Return the last component of a pathname.
*
* @param path The pathname to get the base name from.
*
* @return A pointer to the last component inside pathname.
*/
const char *
path_basename(const char *path)
{
const char *last_slash;
last_slash = strrchr(path, '/');
if (last_slash == NULL)
return path;
else
return last_slash + 1;
}
/**
* Create a template for a temporary pathname.
*
* @param suffix The suffix to use for the template string.
*
* @return An allocated string with the created template.
*/
char *
path_make_temp_template(const char *suffix)
{
const char *tmpdir;
tmpdir = getenv("TMPDIR");
if (!tmpdir)
tmpdir = P_tmpdir;
return str_fmt("%s/%s.XXXXXX", tmpdir, suffix);
}
/**
* Escape characters in a pathname for safe locale printing.
*
* We need to quote paths so that they do not cause problems when printing
* them, for example with snprintf(3) which does not work if the format
* string contains %s and an argument has invalid characters for the
* current locale, it will then return -1.
*
* To simplify things, we just escape all 8 bit characters, instead of
* just invalid characters.
*
* @param dst The escaped destination string.
* @param src The source string to escape.
* @param n The size of the destination buffer.
*
* @return The destination string.
*/
char *
path_quote_filename(char *dst, const char *src, size_t n)
{
char *r = dst;
ssize_t size = (ssize_t)n;
if (size == 0)
return r;
while (*src) {
if (*src == '\\') {
size -= 2;
if (size <= 0)
break;
*dst++ = '\\';
*dst++ = '\\';
src++;
} else if (((*src) & 0x80) == '\0') {
size--;
if (size <= 0)
break;
*dst++ = *src++;
} else {
size -= 4;
if (size <= 0)
break;
sprintf(dst, "\\%03o",
*(const unsigned char *)src);
dst += 4;
src++;
}
}
*dst = '\0';
return r;
}
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