/*
 * Copyright (C) 2000-2007 Carsten Haitzler, Geoff Harrison and various contributors
 * Copyright (C) 2007-2021 Kim Woelders
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies of the Software, its documentation and marketing & publicity
 * materials, and acknowledgment shall be given in the documentation, materials
 * and software packages that this Software was used.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include "config.h"

#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "E.h"
#include "file.h"
#include "util.h"

char          **
E_ls(const char *dir, int *num)
{
    int             i, dirlen;
    DIR            *dirp;
    char          **names;
    struct dirent  *dp;

    if ((!dir) || (!*dir))
        return NULL;
    dirp = opendir(dir);
    if (!dirp)
    {
        *num = 0;
        return NULL;
    }
    /* count # of entries in dir (worst case) */
    for (dirlen = 0; readdir(dirp); dirlen++)
        ;
    if (!dirlen)
    {
        closedir(dirp);
        *num = dirlen;
        return NULL;
    }
    names = EMALLOC(char *, dirlen);

    if (!names)
        return NULL;

    rewinddir(dirp);
    for (i = 0; i < dirlen;)
    {
        dp = readdir(dirp);
        if (!dp)
            break;
        if ((strcmp(dp->d_name, ".")) && (strcmp(dp->d_name, "..")))
        {
            names[i] = Estrdup(dp->d_name);
            i++;
        }
    }

    if (i < dirlen)
        dirlen = i;             /* dir got shorter... */
    closedir(dirp);
    *num = dirlen;

    /* Sort names */
    StrlistSort(names, dirlen);

    return names;
}

void
E_md(const char *s)
{
    if ((!s) || (!*s))
        return;
    mkdir(s, S_IRWXU);
}

void
E_mv(const char *s, const char *ss)
{
    if ((!s) || (!ss) || (!*s) || (!*ss))
        return;
    rename(s, ss);
}

void
E_rm(const char *s)
{
    if ((!s) || (!*s))
        return;
    unlink(s);
}

int
file_test(const char *s, unsigned int test)
{
    struct stat     st;
    int             mode;

    if (!s || !*s)
        return 0;

#define EFILE_ALL (EFILE_ANY | EFILE_REG | EFILE_DIR)
    if (test & EFILE_ALL)
    {
        if (stat(s, &st) < 0)
            return 0;
        if ((test & EFILE_REG) && !S_ISREG(st.st_mode))
            return 0;
        if ((test & EFILE_DIR) && !S_ISDIR(st.st_mode))
            return 0;
    }

#define EPERM_ALL (EPERM_R | EPERM_W | EPERM_X)
    if (test & EPERM_ALL)
    {
        mode = 0;
        if (test & EPERM_R)
            mode |= R_OK;
        if (test & EPERM_W)
            mode |= W_OK;
        if (test & EPERM_X)
            mode |= X_OK;
        if (access(s, mode))
            return 0;
    }

    return 1;
}

time_t
moddate(const char *s)
{
    struct stat     st;

    if ((!s) || (!*s))
        return 0;
    if (stat(s, &st) < 0)
        return 0;
    if (st.st_mtime > st.st_ctime)
        return st.st_mtime;
    return st.st_ctime;
}

#if 0                           /* Unused */
int
filesize(const char *s)
{
    struct stat     st;

    if ((!s) || (!*s))
        return 0;
    if (stat(s, &st) < 0)
        return 0;
    return (int)st.st_size;
}
#endif

int
fileinode(const char *s)
{
    struct stat     st;

    if ((!s) || (!*s))
        return 0;
    if (stat(s, &st) < 0)
        return 0;
    return (int)st.st_ino;
}

int
filedev(const char *s)
{
    struct stat     st;

    if ((!s) || (!*s))
        return 0;
    if (stat(s, &st) < 0)
        return 0;
    return filedev_map((int)st.st_dev);
}

int
filedev_map(int dev)
{
#ifdef __linux__
    /* device numbers in the anonymous range can't be relied
     * upon, so map them all on a single one */
    switch (dev >> 8)
    {
    default:
        return dev;
    case 0:
    case 144:
    case 145:
    case 146:
        return 1;
    }
#else
    return dev;
#endif
}

int
isabspath(const char *path)
{
    return path[0] == '/';
}

const char     *
fileext(const char *file)
{
    const char     *p;

    p = strrchr(file, '.');
    if (p)
    {
        return p + 1;
    }
    return "";
}

char           *
fileof(const char *path)
{
    const char     *s1, *s2;

    s1 = strrchr(path, '/');
    s1 = (s1) ? s1 + 1 : path;
    s2 = strrchr(s1, '.');
    if (!s2)
        return Estrdup(s1);

    return Estrndup(s1, s2 - s1);
}

const char     *
fullfileof(const char *path)
{
    const char     *s;

    if (!path)
        return NULL;
    s = strrchr(path, '/');
    return (s) ? s + 1 : path;
}

char           *
path_test(const char *file, unsigned int test)
{
    char           *cp, *ep;
    char           *s, *p;
    unsigned int    len, exelen;

    if (!file)
        return NULL;

    if (isabspath(file))
    {
        if (file_test(file, test))
            return Estrdup(file);
        return NULL;
    }
    cp = getenv("PATH");
    if (!cp)
        return Estrdup(file);

    exelen = strlen(file);
    s = NULL;
    ep = cp;
    for (; ep; cp = ep + 1)
    {
        ep = strchr(cp, ':');
        len = (ep) ? (unsigned int)(ep - cp) : strlen(cp);
        if (len == 0)
            continue;
        p = EREALLOC(char, s, len + exelen + 2);

        if (!p)
            break;
        s = p;
        memcpy(s, cp, len);
        s[len] = '/';
        memcpy(s + len + 1, file, exelen + 1);
        if (file_test(s, test))
            return s;
    }
    Efree(s);
    return NULL;
}

int
path_canexec(const char *file)
{
    char           *s;

    s = path_test(file, EFILE_REG | EPERM_X);
    if (!s)
        return 0;
    Efree(s);
    return 1;
}

__EXPORT__ int
path_canexec0(const char *cmd)
{
    char            exe[4096];

    sscanf(cmd, "%4000s", exe);

    return path_canexec(exe);
}