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/***********************************************************************/
/* */
/* Objective Caml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 2001 Institut National de Recherche en Informatique et */
/* en Automatique. All rights reserved. This file is distributed */
/* under the terms of the GNU Library General Public License, with */
/* the special exception on linking described in file ../LICENSE. */
/* */
/***********************************************************************/
/* $Id$ */
/* Unix-specific stuff */
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "config.h"
#ifdef SUPPORT_DYNAMIC_LINKING
#include <dlfcn.h>
#endif
#include "memory.h"
#include "misc.h"
#include "osdeps.h"
#ifndef S_ISREG
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#endif
char * decompose_path(struct ext_table * tbl, char * path)
{
char * p, * q;
int n;
if (path == NULL) return NULL;
p = stat_alloc(strlen(path) + 1);
strcpy(p, path);
q = p;
while (1) {
for (n = 0; q[n] != 0 && q[n] != ':'; n++) /*nothing*/;
ext_table_add(tbl, q);
q = q + n;
if (*q == 0) break;
*q = 0;
q += 1;
}
return p;
}
char * search_in_path(struct ext_table * path, char * name)
{
char * p, * fullname;
int i;
struct stat st;
for (p = name; *p != 0; p++) {
if (*p == '/') goto not_found;
}
for (i = 0; i < path->size; i++) {
fullname = stat_alloc(strlen((char *)(path->contents[i])) +
strlen(name) + 2);
strcpy(fullname, (char *)(path->contents[i]));
if (fullname[0] != 0) strcat(fullname, "/");
strcat(fullname, name);
if (stat(fullname, &st) == 0 && S_ISREG(st.st_mode)) return fullname;
stat_free(fullname);
}
not_found:
fullname = stat_alloc(strlen(name) + 1);
strcpy(fullname, name);
return fullname;
}
#ifdef __CYGWIN32__
/* Cygwin needs special treatment because of the implicit ".exe" at the
end of executable file names */
static int cygwin_file_exists(char * name)
{
int fd;
/* Cannot use stat() here because it adds ".exe" implicitly */
fd = open(name, O_RDONLY);
if (fd == -1) return 0;
close(fd);
return 1;
}
static char * cygwin_search_exe_in_path(struct ext_table * path, char * name)
{
char * p, * fullname;
int i;
for (p = name; *p != 0; p++) {
if (*p == '/' || *p == '\\') goto not_found;
}
for (i = 0; i < path->size; i++) {
fullname = stat_alloc(strlen((char *)(path->contents[i])) +
strlen(name) + 6);
strcpy(fullname, (char *)(path->contents[i]));
strcat(fullname, "/");
strcat(fullname, name);
if (cygwin_file_exists(fullname)) return fullname;
strcat(fullname, ".exe");
if (cygwin_file_exists(fullname)) return fullname;
stat_free(fullname);
}
not_found:
fullname = stat_alloc(strlen(name) + 5);
strcpy(fullname, name);
if (cygwin_file_exists(fullname)) return fullname;
strcat(fullname, ".exe");
if (cygwin_file_exists(fullname)) return fullname;
strcpy(fullname, name);
return fullname;
}
#endif
char * search_exe_in_path(char * name)
{
struct ext_table path;
char * tofree;
char * res;
ext_table_init(&path, 8);
tofree = decompose_path(&path, getenv("PATH"));
#ifndef __CYGWIN32__
res = search_in_path(&path, name);
#else
res = cygwin_search_exe_in_path(&path, name);
#endif
stat_free(tofree);
ext_table_free(&path, 0);
return res;
}
char * search_dll_in_path(struct ext_table * path, char * name)
{
char * dllname = stat_alloc(strlen(name) + 4);
char * res;
strcpy(dllname, name);
strcat(dllname, ".so");
res = search_in_path(path, dllname);
stat_free(dllname);
return res;
}
#ifdef SUPPORT_DYNAMIC_LINKING
#ifndef RTLD_GLOBAL
#define RTLD_GLOBAL 0
#endif
#ifndef RTLD_NODELETE
#define RTLD_NODELETE 0
#endif
void * caml_dlopen(char * libname)
{
return dlopen(libname, RTLD_NOW|RTLD_GLOBAL|RTLD_NODELETE);
}
void caml_dlclose(void * handle)
{
dlclose(handle);
}
void * caml_dlsym(void * handle, char * name)
{
return dlsym(handle, name);
}
char * caml_dlerror(void)
{
return dlerror();
}
#else
void * caml_dlopen(char * libname)
{
return NULL;
}
void caml_dlclose(void * handle)
{
}
void * caml_dlsym(void * handle, char * name)
{
return NULL;
}
char * caml_dlerror(void)
{
return "dynamic loading not supported on this platform";
}
#endif
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