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