binutils-gdb/libiberty/getcwd.c

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/* Emulate getcwd using getwd.
This function is in the public domain. */
/*
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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
@var{pathname}, which is assumed to point to a buffer of at least
@var{len} bytes, and return a pointer to the buffer. If the current
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
@code{malloc}.
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@end deftypefn
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*/
#include "config.h"
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#include <errno.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
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extern char *getwd ();
extern int errno;
#ifndef MAXPATHLEN
#define MAXPATHLEN 1024
#endif
char *
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getcwd (char *buf, size_t len)
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{
char ourbuf[MAXPATHLEN];
char *result;
result = getwd (ourbuf);
if (result) {
if (strlen (ourbuf) >= len) {
errno = ERANGE;
return 0;
}
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if (!buf) {
buf = (char*)malloc(len);
if (!buf) {
errno = ENOMEM;
return 0;
}
}
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strcpy (buf, ourbuf);
}
return buf;
}