| 1 | /* Emulate getcwd using getwd. |
| 2 | This function is in the public domain. */ |
| 3 | |
| 4 | /* |
| 5 | |
| 6 | @deftypefn Supplemental char* getcwd (char *@var{pathname}, int @var{len}) |
| 7 | |
| 8 | Copy the absolute pathname for the current working directory into |
| 9 | @var{pathname}, which is assumed to point to a buffer of at least |
| 10 | @var{len} bytes, and return a pointer to the buffer. If the current |
| 11 | directory's path doesn't fit in @var{len} characters, the result is |
| 12 | @code{NULL} and @code{errno} is set. If @var{pathname} is a null pointer, |
| 13 | @code{getcwd} will obtain @var{len} bytes of space using |
| 14 | @code{malloc}. |
| 15 | |
| 16 | @end deftypefn |
| 17 | |
| 18 | */ |
| 19 | |
| 20 | #include "config.h" |
| 21 | |
| 22 | #ifdef HAVE_SYS_PARAM_H |
| 23 | #include <sys/param.h> |
| 24 | #endif |
| 25 | #include <errno.h> |
| 26 | #ifdef HAVE_STRING_H |
| 27 | #include <string.h> |
| 28 | #endif |
| 29 | #ifdef HAVE_STDLIB_H |
| 30 | #include <stdlib.h> |
| 31 | #endif |
| 32 | |
| 33 | extern char *getwd (); |
| 34 | extern int errno; |
| 35 | |
| 36 | #ifndef MAXPATHLEN |
| 37 | #define MAXPATHLEN 1024 |
| 38 | #endif |
| 39 | |
| 40 | char * |
| 41 | getcwd (char *buf, size_t len) |
| 42 | { |
| 43 | char ourbuf[MAXPATHLEN]; |
| 44 | char *result; |
| 45 | |
| 46 | result = getwd (ourbuf); |
| 47 | if (result) { |
| 48 | if (strlen (ourbuf) >= len) { |
| 49 | errno = ERANGE; |
| 50 | return 0; |
| 51 | } |
| 52 | if (!buf) { |
| 53 | buf = (char*)malloc(len); |
| 54 | if (!buf) { |
| 55 | errno = ENOMEM; |
| 56 | return 0; |
| 57 | } |
| 58 | } |
| 59 | strcpy (buf, ourbuf); |
| 60 | } |
| 61 | return buf; |
| 62 | } |