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 } 63
