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