d7cf8390c7
include/ 2005-05-24 Gabriel Dos Reis <gdr@integrable-solutions.net> * libiberty.h (ACONCAT): Properly cast value of alloca(). * ansidecl.h (ATTRIBUTE_UNUSED_LABEL): Don't define if __cplusplus. libiberty/ 2005-05-24 Gabriel Dos Reis <gdr@integrable-solutions.net> * configure.ac: Check declarations for calloc(), getenv(), malloc(), realloc() and sbrk(). * config.in: Regenerate. * configure: Likewise. * alloca.c (C_alloca): Change "new" to "new_storage". Use XNEWVEC instead of xmalloc. * choose-temp.c (choose_temp_base): Use XNEWVEC instea od xmalloc. * concat.c (liiberty_concat_ptr): Surround definition with an extern "C" block, if __cplusplus. (concat): Use XNEWVEC instead of xmalloc. (reconcat): Likewise. * cp-demangle.c (struct d_print_template): Rename member "template" to "template_decl". Adjust use throughout the file. (d_print_resize): Properly cast return value of realloc(). (cplus_demangle_print): Same for malloc(). (d_demangle): Likewise. * cp-demint.c (cplus_demangle_fill_builtin_type): Rename parameter "typename" to "type_name". * cplus-dem.c (grow_vect): Use XRESIZEVEC instead of xrealloc(). (work_stuff_copy_to_from): Use XNEWVEC insteand of xmalloc(). (demangle_template_value_parm): Likewise. (demangle_template): Likewise. (recursively_demangle): Likewise. (do_hpacc_template_literal): Likewise. (do_arg): Likewise. (remember_type): Likewise. (remember_Ktype): Likewise. (register_Btype): Likewise. (string_need): Use XRESIZEVEC instead of xrealloc(). * dyn-string.c (dyn_string_init): Use XNEWVEC. (dyn_string_new): Use XNEW. (dyn_string_resize): Use XRESIZEVEC. * fnmatch.c (fnmatch): Rename local variable "not" to "negate". * getopt.c (getenv): Declare only if !__cplusplus and !getenv. Otherwise include <stdlib.h>. (exchange): Cast return value of malloc(). * hashtab.c (htab_size): Define as both macro and non-inline function. (htab_elements): Likewise. * getpwd.c (getpwd): Use XNEWVEC. (htab_create_alloc_ex): Use C90 prototype-style. * lrealpath.c (lrealpath): Appropriately cast return value of malloc(). * make-relative-prefix.c (save_string): Likewise. * make-temp-file.c (try_dir): Rename from "try". Adjust use in the file. (choose_tmpdir): Use XNEWVEC. * mkstemps.c (mkstemps): Rename parameter "template" to "pattern". * pex-common.c (pex_init_common): Use XNEW. (pex_add_remove): Use XRESIZEVEC. (pex_run): Likewise. (pex_get_status_and_time): Likewise. * pex-djgpp.c (pex_djgpp_exec_child): Likewise. * pex-msdos.c (pex_init): Use XNEW. (pex_msdos_exec_child): Likewise. (pex_msdos_exec_child): Use XRESIZEVEC. * pex-unix.c (pex_wait): Use XNEW. * pex-win32.c (fix_argv): Use XNEWVEC. * pexecute.c (pwait): Likewise. * setenv.c (setenv): Properly cast return value of malloc(). * sigsetmask.c (sigsetmask): Rename local variables "old" and "new" to "old_sig" and "new_sig". * sort.c (main): Use XNEWVEC. * spaces.c (spaces): Cast return value of malloc(). * strndup.c (strndup): Likewise. * ternary.c (ternary_insert): Use XNEW. * xmalloc.c (malloc, realloc, calloc, sbrk): Surround declaration with an extern "C" block if __cplusplus. * xstrdup.c (xstrdup): Cast return value of memcpy(). * xstrerror.c (strerror): Enclose declaration in an extern "C" block if __cplusplus. * xstrndup.c (xstrndup): Use XNEW. Cast return value of memcpy(). From-SVN: r100115
129 lines
2.5 KiB
C
129 lines
2.5 KiB
C
/* getpwd.c - get the working directory */
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/*
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@deftypefn Supplemental char* getpwd (void)
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Returns the current working directory. This implementation caches the
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result on the assumption that the process will not call @code{chdir}
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between calls to @code{getpwd}.
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@end deftypefn
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#include "libiberty.h"
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/* Virtually every UN*X system now in common use (except for pre-4.3-tahoe
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BSD systems) now provides getcwd as called for by POSIX. Allow for
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the few exceptions to the general rule here. */
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#if !defined(HAVE_GETCWD) && defined(HAVE_GETWD)
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/* Prototype in case the system headers doesn't provide it. */
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extern char *getwd ();
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#define getcwd(buf,len) getwd(buf)
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#endif
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#ifdef MAXPATHLEN
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#define GUESSPATHLEN (MAXPATHLEN + 1)
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#else
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#define GUESSPATHLEN 100
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#endif
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#if !(defined (VMS) || (defined(_WIN32) && !defined(__CYGWIN__)))
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/* Get the working directory. Use the PWD environment variable if it's
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set correctly, since this is faster and gives more uniform answers
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to the user. Yield the working directory if successful; otherwise,
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yield 0 and set errno. */
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char *
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getpwd (void)
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{
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static char *pwd;
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static int failure_errno;
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char *p = pwd;
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size_t s;
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struct stat dotstat, pwdstat;
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if (!p && !(errno = failure_errno))
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{
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if (! ((p = getenv ("PWD")) != 0
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&& *p == '/'
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&& stat (p, &pwdstat) == 0
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&& stat (".", &dotstat) == 0
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&& dotstat.st_ino == pwdstat.st_ino
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&& dotstat.st_dev == pwdstat.st_dev))
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/* The shortcut didn't work. Try the slow, ``sure'' way. */
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for (s = GUESSPATHLEN; !getcwd (p = XNEWVEC (char, s), s); s *= 2)
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{
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int e = errno;
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free (p);
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#ifdef ERANGE
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if (e != ERANGE)
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#endif
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{
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errno = failure_errno = e;
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p = 0;
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break;
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}
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}
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/* Cache the result. This assumes that the program does
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not invoke chdir between calls to getpwd. */
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pwd = p;
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}
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return p;
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}
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#else /* VMS || _WIN32 && !__CYGWIN__ */
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 255
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#endif
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char *
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getpwd (void)
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{
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static char *pwd = 0;
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if (!pwd)
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pwd = getcwd (XNEWVEC (char, MAXPATHLEN + 1), MAXPATHLEN + 1
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#ifdef VMS
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, 0
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#endif
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);
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return pwd;
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}
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#endif /* VMS || _WIN32 && !__CYGWIN__ */
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