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/*
platform.c -- Platform dependent code
Copyright © 2021-2023 Samuel Lidén Borell <samuel@kodafritt.se>
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 or substantial portions of the Software.
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 OR COPYRIGHT HOLDERS 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.
*/
#define _CSLULWINLIBC_SOURCE 1 /* for cslulwinlibc_getappdir() on Windows */
#include "internal.h"
#include "defaults.h"
#define INTERR_PLATFORM(errnum) MAKE_INTERR(errnum, INTERRBASE_PLATFORM)
#if defined(PLATFORM_NIX) || defined(PLATFORM_FAKEPOSIX)
# include <errno.h>
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# include <sys/stat.h>
# include <sys/types.h>
#else
# include <stdio.h>
# include <stdlib.h>
# include <string.h>
#endif
#ifdef PLATFORM_NIX
# include <fcntl.h> /* for creat() */
# ifndef NO_GETPWUID
# include <unistd.h> /* for getuid() */
# include <pwd.h> /* for getpwuid(), struct passwd */
# endif
#endif
static int add_system_iface_dirs(struct CSlulConfig *cfg)
{
#ifdef NO_DEFAULT_IFACEDIRS
return cslul_config_add_iface_dir(cfg, SLULIFACEDIR);
#elif defined(PLATFORM_WIN)
/* TODO add %APPDATA%\\slul-interfaces */
/* TODO add %CommonProgramFiles%\\slul-interfaces */
char *appdir = cslulwinlibc_getappdir("bin", "slul-interfaces");
if (appdir) {
if (!cslul_config_add_iface_dir(cfg, appdir)) {
free(appdir);
return 0;
}
cfg->alloced_appdir = appdir;
}
return 1;
#else
static const char subdir_xdg[] = "/slul-interfaces";
static const char subdir_home[] = "/.local/share/slul-interfaces";
const char *env, *add;
char *userpath;
size_t envlen, addlen;
if (strlen(USR_SLULIFACEDIR) > 0 &&
strcmp(USR_SLULIFACEDIR, SLULIFACEDIR) &&
!cslul_config_add_iface_dir(cfg, USR_SLULIFACEDIR))
return 0;
if (strlen(USRLOCAL_SLULIFACEDIR) > 0 &&
strcmp(USRLOCAL_SLULIFACEDIR, SLULIFACEDIR) &&
!cslul_config_add_iface_dir(cfg, USRLOCAL_SLULIFACEDIR))
return 0;
if (!cslul_config_add_iface_dir(cfg, SLULIFACEDIR))
return 0;
env = getenv("XDG_DATA_HOME");
if (env && *env) {
add = subdir_xdg;
addlen = sizeof(subdir_xdg);
} else {
env = getenv("HOME");
#if defined(PLATFORM_NIX) && !defined(NO_GETPWUID)
if (!env || !*env) {
/* Fall back to looking in passwd file */
struct passwd *pwd = getpwuid(getuid());
if (!pwd) return 1;
env = pwd->pw_dir;
}
#endif
if (env && *env) {
add = subdir_home;
addlen = sizeof(subdir_home);
} else {
return 1;
}
}
envlen = strlen(env);
userpath = cfgalloc(cfg, envlen + addlen + 1);
if (!userpath) return 0;
memcpy(userpath, env, envlen);
memcpy(userpath+envlen, add, addlen);
userpath[envlen+addlen] = '\0';
return cslul_config_add_iface_dir(cfg, userpath);
#endif
}
static int add_iface_dirs_from_envvar(struct CSlulConfig *cfg, const char *env)
{
char *start, *s;
size_t len = strlen(env);
start = cfgalloc(cfg, len+1);
if (!start) return 0;
memcpy(start, env, len+1);
s = start + len;
/* Environment variable is processed backwards (leftmost entries
have the highest priority), and path separators are replaced
with '\0' and the entry to the left use it as a null terminator. */
for (;;) {
if (*s == PATHSEP || *s == ';') {
if (!cslul_config_add_iface_dir(cfg, s+1)) return 0;
*s = '\0';
} else if (s == start) {
return cslul_config_add_iface_dir(cfg, s);
}
s--;
}
}
int cslul_config_add_default_iface_dirs(struct CSlulConfig *cfg)
{
const char *env;
if (!add_system_iface_dirs(cfg)) return 0;
env = getenv("SLUL_INTERFACE_PATH");
if (env && *env) {
return add_iface_dirs_from_envvar(cfg, env);
}
return 1;
}
/** Creates an executable file */
CSlulFile slul_createexec(const char *filename)
{
#if defined(PLATFORM_NIX)
int fd = creat(filename, S_IRWXU|S_IRWXG|S_IRWXO);
if (fd == -1) return NULL;
return fdopen(fd, "wb");
#else
return fopen(filename, "wb");
#endif
}
int slul_mkdir(const char *filename)
{
#if defined(PLATFORM_NIX) || defined(PLATFORM_FAKEPOSIX)
if (mkdir(filename, S_IRWXU|S_IRWXG|S_IRWXO) == -1) {
/* This can also happen the filename is in use by a non-directory.
In that case, an error will be reported and handled later on. */
return errno == EEXIST;
} else {
return 1;
}
#else
return 0;
#endif
}
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