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/* fnutil.c - file name utilities
(Originally composed from several files in Lars Wirzenius' publib.)
Copyright © 1994 Lars Wirzenius. All rights reserved.
Copyright © 2004 Antti-Juhani Kaijanaho. 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.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#include <assert.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifndef USERNAME_MAX
#define USERNAME_MAX 9
#endif
char *fnbase(const char *fname)
{
char *base;
assert(fname != NULL);
base = strrchr(fname, '/');
if (base == NULL)
return (char *) fname;
return base+1;
}
char * fnqualify(char const * path)
{
size_t len, size;
struct passwd *pwd;
const char *p;
assert(path != NULL);
/* Is it qualified already? */
if (path[0] == '/') {
return strdup(path);
}
/* Do we just need to prepend the current directory? */
if (path[0] != '~') {
char * cwd = get_current_dir_name();
if (cwd == 0) return 0;
len = strlen(cwd);
size = len + 1 + strlen(path) + 1; /* +2 for '/' and '\0' */
char * res = malloc(size);
if (res == 0) {
free(cwd);
return 0;
}
sprintf(res, "%s/%s", cwd, path);
return res;
}
/* We need to do tilde substitution, get the password entry (which
includes the name of the home directory) */
if (path[1] == '\0' || path[1] == '/') {
pwd = getpwuid(getuid());
if (path[1] == '\0')
p = path + 1;
else
p = path + 2;
} else {
p = strchr(path, '/');
if (p == NULL)
p = strchr(path, '\0');
size = (size_t) (p-path);
char * username = malloc(size);
if (username == 0) {
errno = ENOMEM;
return 0;
}
memcpy(username, path+1, size);
username[size-1] = '\0';
pwd = getpwnam(username);
if (*p == '/')
++p;
free(username);
}
if (pwd == NULL) {
errno = ENOENT;
return 0;
}
/* Now we have all the necessary information, build the result */
size = strlen(pwd->pw_dir) + 1 + strlen(p) + 1;
char * result = malloc(size);
if (result == 0) return 0;
sprintf(result, "%s/%s", pwd->pw_dir, p);
return result;
}
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