2 * wrappers around low-level operations to provide a simpler interface
3 * to the operations that Lisp needs
5 * The functions in this file are typically called directly from Lisp.
6 * Thus, when their signature changes, they don't need updates in a .h
7 * file somewhere, but they do need updates in the Lisp code. FIXME:
8 * It would be nice to enforce this at compile time. It mighn't even
9 * be all that hard: make the cross-compiler versions of DEF-ALIEN-FOO
10 * macros accumulate strings in a list which then gets written out at
11 * the end of sbcl2.h at the end of cross-compilation, then rerun
12 * 'make' in src/runtime/ using the new sbcl2.h as sbcl.h (and make
13 * sure that all the files in src/runtime/ include sbcl.h). */
16 * This software is part of the SBCL system. See the README file for
19 * This software is derived from the CMU CL system, which was
20 * written at Carnegie Mellon University and released into the
21 * public domain. The software is in the public domain and is
22 * provided with absolutely no warranty. See the COPYING and CREDITS
23 * files for more information.
26 #include <sys/types.h>
37 * stuff needed by CL:DIRECTORY and other Lisp directory operations
40 /* Unix directory operations think of "." and ".." as filenames, but
41 * Lisp directory operations do not. */
43 is_lispy_filename(const char *filename)
45 return strcmp(filename, ".") && strcmp(filename, "..");
48 /* Return a zero-terminated array of strings holding the Lispy filenames
49 * (i.e. excluding the Unix magic "." and "..") in the named directory. */
51 alloc_directory_lispy_filenames(const char *directory_name)
56 if (dir_ptr = opendir(directory_name)) { /* if opendir success */
60 if (0 == voidacc_ctor(&va)) { /* if voidacc_ctor success */
61 struct dirent *dirent_ptr;
63 while (dirent_ptr = readdir(dir_ptr)) { /* until end of data */
64 char* original_name = dirent_ptr->d_name;
65 if (is_lispy_filename(original_name)) {
66 /* strdup(3) is in Linux and *BSD. If you port
67 * somewhere else that doesn't have it, it's easy
69 char* dup_name = strdup(original_name);
70 if (!dup_name) { /* if strdup failure */
73 if (voidacc_acc(&va, dup_name)) { /* if acc failure */
78 result = (char**)voidacc_give_away_result(&va);
83 /* ignoring closedir(3) return code, since what could we do?
85 * "Never ask questions you don't want to know the answer to."
86 * -- William Irving Zumwalt (Rich Cook, _The Wizardry Quested_) */
93 /* Free a result returned by alloc_directory_lispy_filenames(). */
95 free_directory_lispy_filenames(char** directory_lispy_filenames)
99 /* Free the strings. */
100 for (p = directory_lispy_filenames; *p; ++p) {
104 /* Free the table of strings. */
105 free(directory_lispy_filenames);
112 /* As of 0.6.12, the FFI can't handle 64-bit values. For now, we use
113 * these munged-to-32-bits values for might-be-64-bit slots of
114 * stat_wrapper as a workaround, so that at least we can still work
115 * when values are small.
117 * FIXME: But of course we should fix the FFI so that we can use the
118 * actual 64-bit values instead. */
119 typedef long ffi_dev_t; /* since Linux dev_t can be 64 bits */
120 typedef u32 ffi_off_t; /* since OpenBSD 2.8 st_size is 64 bits */
122 /* a representation of stat(2) results which doesn't depend on CPU or OS */
123 struct stat_wrapper {
124 /* KLUDGE: The verbose wrapped_st_ prefixes are to protect us from
125 * the C preprocessor as wielded by the fiends of OpenBSD, who do
127 * #define st_atime st_atimespec.tv_sec
128 * I remember when I was young and innocent, I read about how the
129 * C preprocessor isn't to be used to globally munge random
130 * lowercase symbols like this, because things like this could
131 * happen, and I nodded sagely. But now I know better.:-| This is
132 * another entry for Dan Barlow's ongoing episodic rant about C
133 * header files, I guess.. -- WHN 2001-05-10 */
134 ffi_dev_t wrapped_st_dev; /* device */
135 ino_t wrapped_st_ino; /* inode */
136 mode_t wrapped_st_mode; /* protection */
137 nlink_t wrapped_st_nlink; /* number of hard links */
138 uid_t wrapped_st_uid; /* user ID of owner */
139 gid_t wrapped_st_gid; /* group ID of owner */
140 ffi_dev_t wrapped_st_rdev; /* device type (if inode device) */
141 ffi_off_t wrapped_st_size; /* total size, in bytes */
142 unsigned long wrapped_st_blksize; /* blocksize for filesystem I/O */
143 unsigned long wrapped_st_blocks; /* number of blocks allocated */
144 time_t wrapped_st_atime; /* time_t of last access */
145 time_t wrapped_st_mtime; /* time_t of last modification */
146 time_t wrapped_st_ctime; /* time_t of last change */
150 copy_to_stat_wrapper(struct stat_wrapper *to, struct stat *from)
152 #define FROB(stem) to->wrapped_st_##stem = from->st_##stem
170 stat_wrapper(const char *file_name, struct stat_wrapper *buf)
172 struct stat real_buf;
174 if ((ret = stat(file_name,&real_buf)) >= 0)
175 copy_to_stat_wrapper(buf, &real_buf);
180 lstat_wrapper(const char *file_name, struct stat_wrapper *buf)
182 struct stat real_buf;
184 if ((ret = lstat(file_name,&real_buf)) >= 0)
185 copy_to_stat_wrapper(buf, &real_buf);
190 fstat_wrapper(int filedes, struct stat_wrapper *buf)
192 struct stat real_buf;
194 if ((ret = fstat(filedes,&real_buf)) >= 0)
195 copy_to_stat_wrapper(buf, &real_buf);