* Thus, when their signature changes, they don't need updates in a .h
* file somewhere, but they do need updates in the Lisp code. FIXME:
* It would be nice to enforce this at compile time. It mighn't even
- * be all that hard: make the cross-compiler versions of DEF-ALIEN-FOO
+ * be all that hard: make the cross-compiler versions of DEFINE-ALIEN-FOO
* macros accumulate strings in a list which then gets written out at
* the end of sbcl2.h at the end of cross-compilation, then rerun
* 'make' in src/runtime/ using the new sbcl2.h as sbcl.h (and make
#include <sys/types.h>
#include <dirent.h>
+#include <sys/stat.h>
+#include <stdlib.h>
#include <string.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <stdio.h>
+#include "sbcl.h"
+#include "runtime.h"
#include "util.h"
-\f
+
+/* Although it might seem as though this should be in some standard
+ Unix header, according to Perry E. Metzger, in a message on
+ sbcl-devel dated 2004-03-29, this is the POSIXly-correct way of
+ using environ: by an explicit declaration. -- CSR, 2004-03-30 */
+extern char **environ;
+\f
/*
* stuff needed by CL:DIRECTORY and other Lisp directory operations
*/
char**
alloc_directory_lispy_filenames(const char *directory_name)
{
- DIR *dir_ptr;
+ DIR *dir_ptr = opendir(directory_name);
char **result = 0;
- if (dir_ptr = opendir(directory_name)) { /* if opendir success */
-
- struct voidacc va;
-
- if (0 == voidacc_ctor(&va)) { /* if voidacc_ctor success */
- struct dirent *dirent_ptr;
-
- while (dirent_ptr = readdir(dir_ptr)) { /* until end of data */
- char* original_name = dirent_ptr->d_name;
- if (is_lispy_filename(original_name)) {
- /* strdup(3) is in Linux and *BSD. If you port
- * somewhere else that doesn't have it, it's easy
- * to reimplement. */
- char* dup_name = strdup(original_name);
- if (!dup_name) { /* if strdup failure */
- goto dtors;
- }
- if (voidacc_acc(&va, dup_name)) { /* if acc failure */
- goto dtors;
- }
- }
- }
- result = (char**)voidacc_give_away_result(&va);
- }
+ if (dir_ptr) { /* if opendir success */
+
+ struct voidacc va;
+
+ if (0 == voidacc_ctor(&va)) { /* if voidacc_ctor success */
+ struct dirent *dirent_ptr;
+
+ while ( (dirent_ptr = readdir(dir_ptr)) ) { /* until end of data */
+ char* original_name = dirent_ptr->d_name;
+ if (is_lispy_filename(original_name)) {
+ /* strdup(3) is in Linux and *BSD. If you port
+ * somewhere else that doesn't have it, it's easy
+ * to reimplement. */
+ char* dup_name = strdup(original_name);
+ if (!dup_name) { /* if strdup failure */
+ goto dtors;
+ }
+ if (voidacc_acc(&va, dup_name)) { /* if acc failure */
+ goto dtors;
+ }
+ }
+ }
+ result = (char**)voidacc_give_away_result(&va);
+ }
dtors:
- voidacc_dtor(&va);
- /* ignoring closedir(3) return code, since what could we do?
- *
- * "Never ask questions you don't want to know the answer to."
- * -- William Irving Zumwalt (Rich Cook, _The Wizardry Quested_) */
- closedir(dir_ptr);
+ voidacc_dtor(&va);
+ /* ignoring closedir(3) return code, since what could we do?
+ *
+ * "Never ask questions you don't want to know the answer to."
+ * -- William Irving Zumwalt (Rich Cook, _The Wizardry Quested_) */
+ closedir(dir_ptr);
}
return result;
}
-/* Free a result returned by alloc_directory_lispy_filenames. */
+/* Free a result returned by alloc_directory_lispy_filenames(). */
void
free_directory_lispy_filenames(char** directory_lispy_filenames)
{
/* Free the strings. */
for (p = directory_lispy_filenames; *p; ++p) {
- free(*p);
+ free(*p);
}
/* Free the table of strings. */
free(directory_lispy_filenames);
}
+\f
+/*
+ * readlink(2) stuff
+ */
+
+/* a wrapped version of readlink(2):
+ * -- If path isn't a symlink, or is a broken symlink, return 0.
+ * -- If path is a symlink, return a newly allocated string holding
+ * the thing it's linked to. */
+char *
+wrapped_readlink(char *path)
+{
+ int bufsiz = strlen(path) + 16;
+ while (1) {
+ char *result = malloc(bufsiz);
+ int n_read = readlink(path, result, bufsiz);
+ if (n_read < 0) {
+ free(result);
+ return 0;
+ } else if (n_read < bufsiz) {
+ result[n_read] = 0;
+ return result;
+ } else {
+ free(result);
+ bufsiz *= 2;
+ }
+ }
+}
+\f
+/*
+ * stat(2) stuff
+ */
+
+/* As of 0.6.12, the FFI can't handle 64-bit values. For now, we use
+ * these munged-to-32-bits values for might-be-64-bit slots of
+ * stat_wrapper as a workaround, so that at least we can still work
+ * when values are small.
+ *
+ * FIXME: But of course we should fix the FFI so that we can use the
+ * actual 64-bit values instead. In fact, we probably have by now
+ * (2003-10-03) on all working platforms except MIPS and HPPA; if some
+ * motivated spark would simply fix those, this hack could go away.
+ * -- CSR, 2003-10-03 */
+typedef u32 ffi_dev_t; /* since Linux dev_t can be 64 bits */
+typedef u32 ffi_off_t; /* since OpenBSD 2.8 st_size is 64 bits */
+
+/* a representation of stat(2) results which doesn't depend on CPU or OS */
+struct stat_wrapper {
+ /* KLUDGE: The verbose wrapped_st_ prefixes are to protect us from
+ * the C preprocessor as wielded by the fiends of OpenBSD, who do
+ * things like
+ * #define st_atime st_atimespec.tv_sec
+ * I remember when I was young and innocent, I read about how the
+ * C preprocessor isn't to be used to globally munge random
+ * lowercase symbols like this, because things like this could
+ * happen, and I nodded sagely. But now I know better.:-| This is
+ * another entry for Dan Barlow's ongoing episodic rant about C
+ * header files, I guess.. -- WHN 2001-05-10 */
+ ffi_dev_t wrapped_st_dev; /* device */
+ ino_t wrapped_st_ino; /* inode */
+ mode_t wrapped_st_mode; /* protection */
+ nlink_t wrapped_st_nlink; /* number of hard links */
+ uid_t wrapped_st_uid; /* user ID of owner */
+ gid_t wrapped_st_gid; /* group ID of owner */
+ ffi_dev_t wrapped_st_rdev; /* device type (if inode device) */
+ ffi_off_t wrapped_st_size; /* total size, in bytes */
+ unsigned long wrapped_st_blksize; /* blocksize for filesystem I/O */
+ unsigned long wrapped_st_blocks; /* number of blocks allocated */
+ time_t wrapped_st_atime; /* time_t of last access */
+ time_t wrapped_st_mtime; /* time_t of last modification */
+ time_t wrapped_st_ctime; /* time_t of last change */
+};
+
+static void
+copy_to_stat_wrapper(struct stat_wrapper *to, struct stat *from)
+{
+#define FROB(stem) to->wrapped_st_##stem = from->st_##stem
+ FROB(dev);
+ FROB(ino);
+ FROB(mode);
+ FROB(nlink);
+ FROB(uid);
+ FROB(gid);
+ FROB(rdev);
+ FROB(size);
+ FROB(blksize);
+ FROB(blocks);
+ FROB(atime);
+ FROB(mtime);
+ FROB(ctime);
+#undef FROB
+}
+
+int
+stat_wrapper(const char *file_name, struct stat_wrapper *buf)
+{
+ struct stat real_buf;
+ int ret;
+ if ((ret = stat(file_name,&real_buf)) >= 0)
+ copy_to_stat_wrapper(buf, &real_buf);
+ return ret;
+}
+
+int
+lstat_wrapper(const char *file_name, struct stat_wrapper *buf)
+{
+ struct stat real_buf;
+ int ret;
+ if ((ret = lstat(file_name,&real_buf)) >= 0)
+ copy_to_stat_wrapper(buf, &real_buf);
+ return ret;
+}
+
+int
+fstat_wrapper(int filedes, struct stat_wrapper *buf)
+{
+ struct stat real_buf;
+ int ret;
+ if ((ret = fstat(filedes,&real_buf)) >= 0)
+ copy_to_stat_wrapper(buf, &real_buf);
+ return ret;
+}
+\f
+/*
+ * getpwuid() stuff
+ */
+
+/* Return a newly-allocated string holding the username for "uid", or
+ * NULL if there's no such user.
+ *
+ * KLUDGE: We also return NULL if malloc() runs out of memory
+ * (returning strdup() result) since it's not clear how to handle that
+ * error better. -- WHN 2001-12-28 */
+char *
+uid_username(int uid)
+{
+ struct passwd *p = getpwuid(uid);
+ if (p) {
+ /* The object *p is a static struct which'll be overwritten by
+ * the next call to getpwuid(), so it'd be unsafe to return
+ * p->pw_name without copying. */
+ return strdup(p->pw_name);
+ } else {
+ return 0;
+ }
+}
+
+char *
+uid_homedir(uid_t uid)
+{
+ struct passwd *p = getpwuid(uid);
+ if(p) {
+ /* Let's be careful about this, shall we? */
+ size_t len = strlen(p->pw_dir);
+ if (p->pw_dir[len-1] == '/') {
+ return strdup(p->pw_dir);
+ } else {
+ char *result = malloc(len + 2);
+ if (result) {
+ int nchars = sprintf(result,"%s/",p->pw_dir);
+ if (nchars == len + 1) {
+ return result;
+ } else {
+ return 0;
+ }
+ } else {
+ return 0;
+ }
+ }
+ } else {
+ return 0;
+ }
+}
+\f
+/*
+ * functions to get miscellaneous C-level variables
+ *
+ * (Doing this by calling functions lets us borrow the smarts of the C
+ * linker, so that things don't blow up when libc versions and thus
+ * variable locations change between compile time and run time.)
+ */
+
+char **
+wrapped_environ()
+{
+ return environ;
+}
projects / sbcl.git / blobdiff