src/lib/home-expand.c

/* Copyright (c) 2003-2018 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "ipwd.h"
#include "home-expand.h"


int home_try_expand(const char **_path)
{
    const char *path = *_path;
    const char *name, *home, *p;
    struct passwd pw;

    if (path == NULL || *path != '~')
        return 0;

    path++;
    if (*path == '/' || *path == '\0') {
        home = getenv("HOME");
        if (*path != '\0') path++;
    } else {
        p = strchr(path, '/');
        if (p == NULL) {
            name = path;
            path = "";
        } else {
            name = t_strdup_until(path, p);
            path = p+1;
        }
        switch (i_getpwnam(name, &pw)) {
        case -1:
            i_error("getpwnam(%s) failed: %m", name);
            home = NULL;
            break;
        case 0:
            home = NULL;
            break;
        default:
            home = pw.pw_dir;
            break;
        }
    }

    if (home == NULL)
        return -1;

    if (*path == '\0')
        *_path = t_strdup(home);
    else
        *_path = t_strconcat(home, "/", path, NULL);
    return 0;
}

const char *home_expand(const char *path)
{
    (void)home_try_expand(&path);
    return path;
}

const char *home_expand_tilde(const char *path, const char *home)
{
    if (path == NULL || *path != '~')
        return path;

    if (path[1] == '\0')
        return home;
    if (path[1] != '/')
        return path;

    /* ~/ used */
    return t_strconcat(home, path + 1, NULL);
}