63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
/* Emulate getcwd using getwd.
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This function is in the public domain. */
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/*
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@deftypefn Supplemental char* getcwd (char *@var{pathname}, int @var{len})
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Copy the absolute pathname for the current working directory into
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@var{pathname}, which is assumed to point to a buffer of at least
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@var{len} bytes, and return a pointer to the buffer. If the current
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directory's path doesn't fit in @var{len} characters, the result is
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@code{NULL} and @code{errno} is set. If @var{pathname} is a null pointer,
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@code{getcwd} will obtain @var{len} bytes of space using
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@code{malloc}.
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@end deftypefn
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*/
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#include "config.h"
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#include <errno.h>
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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extern char *getwd ();
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extern int errno;
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 1024
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#endif
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char *
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getcwd (char *buf, size_t len)
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{
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char ourbuf[MAXPATHLEN];
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char *result;
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result = getwd (ourbuf);
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if (result) {
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if (strlen (ourbuf) >= len) {
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errno = ERANGE;
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return 0;
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}
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if (!buf) {
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buf = (char*)malloc(len);
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if (!buf) {
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errno = ENOMEM;
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return 0;
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}
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}
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strcpy (buf, ourbuf);
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}
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return buf;
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}
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