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