/*      $OpenBSD: bsdstubs.c,v 1.2 2025/05/09 06:07:51 tb Exp $ */
/*      $OpenBSD: bsdstubs.c,v 1.2 2025/05/09 06:07:51 tb Exp $ */

/*
 * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>

#include <libpkgconf/bsdstubs.h>
#include <libpkgconf/config.h>

#if !HAVE_DECL_STRLCPY
/*
 * Copy src to string dst of size siz.  At most siz-1 characters
 * will be copied.  Always NUL terminates (unless siz == 0).
 * Returns strlen(src); if retval >= siz, truncation occurred.
 */
static inline size_t
strlcpy(char *dst, const char *src, size_t siz)
{
        char *d = dst;
        const char *s = src;
        size_t n = siz;

        /* Copy as many bytes as will fit */
        if (n != 0) {
                while (--n != 0) {
                        if ((*d++ = *s++) == '\0')
                                break;
                }
        }

        /* Not enough room in dst, add NUL and traverse rest of src */
        if (n == 0) {
                if (siz != 0)
                        *d = '\0';              /* NUL-terminate dst */
                while (*s++)
                        ;
        }

        return(s - src - 1);    /* count does not include NUL */
}
#endif

#if !HAVE_DECL_STRLCAT
/*
 * Appends src to string dst of size siz (unlike strncat, siz is the
 * full size of dst, not space left).  At most siz-1 characters
 * will be copied.  Always NUL terminates (unless siz <= strlen(dst)).
 * Returns strlen(src) + MIN(siz, strlen(initial dst)).
 * If retval >= siz, truncation occurred.
 */
static inline size_t
strlcat(char *dst, const char *src, size_t siz)
{
        char *d = dst;
        const char *s = src;
        size_t n = siz;
        size_t dlen;

        /* Find the end of dst and adjust bytes left but don't go past end */
        while (n-- != 0 && *d != '\0')
                d++;
        dlen = d - dst;
        n = siz - dlen;

        if (n == 0)
                return(dlen + strlen(s));
        while (*s != '\0') {
                if (n != 1) {
                        *d++ = *s;
                        n--;
                }
                s++;
        }
        *d = '\0';

        return(dlen + (s - src));       /* count does not include NUL */
}
#endif

/*
 * Copyright (c) 2012 William Pitcock <nenolod@dereferenced.org>.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * This software is provided 'as is' and without any warranty, express or
 * implied.  In no event shall the authors be liable for any damages arising
 * from the use of this software.
 */

#if !HAVE_DECL_STRNDUP
/*
 * Creates a memory buffer and copies at most 'len' characters to it.
 * If 'len' is less than the length of the source string, truncation occured.
 */
static inline char *
strndup(const char *src, size_t len)
{
        char *out = malloc(len + 1);
        pkgconf_strlcpy(out, src, len + 1);
        return out;
}
#endif

#if !HAVE_DECL_PLEDGE
static inline int
pledge(const char *promises, const char *execpromises)
{
        (void) promises;
        (void) execpromises;

        return 0;
}
#endif

#if !HAVE_DECL_UNVEIL
static inline int
unveil(const char *path, const char *permissions)
{
        (void) path;
        (void) permissions;

        return 0;
}
#endif

size_t
pkgconf_strlcpy(char *dst, const char *src, size_t siz)
{
        return strlcpy(dst, src, siz);
}

size_t
pkgconf_strlcat(char *dst, const char *src, size_t siz)
{
        return strlcat(dst, src, siz);
}

char *
pkgconf_strndup(const char *src, size_t len)
{
        return strndup(src, len);
}

#if !HAVE_DECL_REALLOCARRAY
void *
reallocarray(void *ptr, size_t m, size_t n)
{
        if (n && m > -1 / n)
        {
                errno = ENOMEM;
                return 0;
        }

        return realloc(ptr, m * n);
}
#endif

void *
pkgconf_reallocarray(void *ptr, size_t m, size_t n)
{
        return reallocarray(ptr, m, n);
}

int
pkgconf_pledge(const char *promises, const char *execpromises)
{
        return pledge(promises, execpromises);
}

int
pkgconf_unveil(const char *path, const char *permissions)
{
        return unveil(path, permissions);
}