projects / binutils.git / blame
| Commit | Line | Data |
|---|---|---|
| e2eaf477 ILT |
1 | /* getpwd.c - get the working directory */ |
| 2 | ||
| 39423523 DD |
3 | /* |
| 4 | ||
| 99b58139 | 5 | @deftypefn Supplemental char* getpwd (void) |
| 39423523 DD |
6 | |
| 7 | Returns the current working directory. This implementation caches the | |
| 8 | result on the assumption that the process will not call @code{chdir} | |
| 9 | between calls to @code{getpwd}. | |
| 10 | ||
| 11 | @end deftypefn | |
| 12 | ||
| 13 | */ | |
| 14 | ||
| e2eaf477 ILT |
15 | #ifdef HAVE_CONFIG_H |
| 16 | #include "config.h" | |
| 17 | #endif | |
| 18 | ||
| 19 | #include <sys/types.h> | |
| 20 | ||
| 21 | #include <errno.h> | |
| 22 | #ifndef errno | |
| 23 | extern int errno; | |
| 24 | #endif | |
| 25 | ||
| 26 | #ifdef HAVE_STDLIB_H | |
| 27 | #include <stdlib.h> | |
| 28 | #endif | |
| 29 | #ifdef HAVE_UNISTD_H | |
| 30 | #include <unistd.h> | |
| 31 | #endif | |
| 32 | #ifdef HAVE_SYS_PARAM_H | |
| 33 | #include <sys/param.h> | |
| 34 | #endif | |
| 35 | #if HAVE_SYS_STAT_H | |
| 36 | #include <sys/stat.h> | |
| 37 | #endif | |
| 38 | ||
| 39 | /* Prototype these in case the system headers don't provide them. */ | |
| 40 | extern char *getpwd (); | |
| 41 | extern char *getwd (); | |
| 42 | ||
| 43 | #include "libiberty.h" | |
| 44 | ||
| 45 | /* Virtually every UN*X system now in common use (except for pre-4.3-tahoe | |
| 46 | BSD systems) now provides getcwd as called for by POSIX. Allow for | |
| 47 | the few exceptions to the general rule here. */ | |
| 48 | ||
| 49 | #if !defined(HAVE_GETCWD) && defined(HAVE_GETWD) | |
| 50 | #define getcwd(buf,len) getwd(buf) | |
| 51 | #endif | |
| 52 | ||
| 53 | #ifdef MAXPATHLEN | |
| 54 | #define GUESSPATHLEN (MAXPATHLEN + 1) | |
| 55 | #else | |
| 56 | #define GUESSPATHLEN 100 | |
| 57 | #endif | |
| 58 | ||
| 59 | #if !(defined (VMS) || (defined(_WIN32) && !defined(__CYGWIN__))) | |
| 60 | ||
| 61 | /* Get the working directory. Use the PWD environment variable if it's | |
| 62 | set correctly, since this is faster and gives more uniform answers | |
| 63 | to the user. Yield the working directory if successful; otherwise, | |
| 64 | yield 0 and set errno. */ | |
| 65 | ||
| 66 | char * | |
| 67 | getpwd () | |
| 68 | { | |
| 69 | static char *pwd; | |
| 70 | static int failure_errno; | |
| 71 | ||
| 72 | char *p = pwd; | |
| 73 | size_t s; | |
| 74 | struct stat dotstat, pwdstat; | |
| 75 | ||
| 76 | if (!p && !(errno = failure_errno)) | |
| 77 | { | |
| 78 | if (! ((p = getenv ("PWD")) != 0 | |
| 79 | && *p == '/' | |
| 80 | && stat (p, &pwdstat) == 0 | |
| 81 | && stat (".", &dotstat) == 0 | |
| 82 | && dotstat.st_ino == pwdstat.st_ino | |
| 83 | && dotstat.st_dev == pwdstat.st_dev)) | |
| 84 | ||
| 85 | /* The shortcut didn't work. Try the slow, ``sure'' way. */ | |
| 86 | for (s = GUESSPATHLEN; ! getcwd (p = xmalloc (s), s); s *= 2) | |
| 87 | { | |
| 88 | int e = errno; | |
| 89 | free (p); | |
| 90 | #ifdef ERANGE | |
| 91 | if (e != ERANGE) | |
| 92 | #endif | |
| 93 | { | |
| 94 | errno = failure_errno = e; | |
| 95 | p = 0; | |
| 96 | break; | |
| 97 | } | |
| 98 | } | |
| 99 | ||
| 100 | /* Cache the result. This assumes that the program does | |
| 101 | not invoke chdir between calls to getpwd. */ | |
| 102 | pwd = p; | |
| 103 | } | |
| 104 | return p; | |
| 105 | } | |
| 106 | ||
| 107 | #else /* VMS || _WIN32 && !__CYGWIN__ */ | |
| 108 | ||
| 109 | #ifndef MAXPATHLEN | |
| 110 | #define MAXPATHLEN 255 | |
| 111 | #endif | |
| 112 | ||
| 113 | char * | |
| 114 | getpwd () | |
| 115 | { | |
| 116 | static char *pwd = 0; | |
| 117 | ||
| 118 | if (!pwd) | |
| 119 | pwd = getcwd (xmalloc (MAXPATHLEN + 1), MAXPATHLEN + 1 | |
| 120 | #ifdef VMS | |
| 121 | , 0 | |
| 122 | #endif | |
| 123 | ); | |
| 124 | return pwd; | |
| 125 | } | |
| 126 | ||
| 127 | #endif /* VMS || _WIN32 && !__CYGWIN__ */ |