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annotate Python/getcwd.c @ 1573:eaaba2cafeeb legacy-trunk

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*** empty log message ***
author Guido van Rossum <guido@python.org>
date Mon, 07 Mar 1994 12:05:46 +0000
parents cd397266dc1c
children b724599401ff
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1 /***********************************************************
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2 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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3 Amsterdam, The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI not be used in advertising or publicity pertaining to
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13 distribution of the software without specific, written prior permission.
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14
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15 STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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16 THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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17 FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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18 FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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21 OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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22
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23 ******************************************************************/
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24
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25 /* Two PD getcwd() implementations.
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26 Author: Guido van Rossum, CWI Amsterdam, Jan 1991, <guido@cwi.nl>. */
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27
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28 /* #define NO_GETWD /* Turn this on to popen pwd instead of calling getwd() */
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29
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30 #include <stdio.h>
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31 #include <errno.h>
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32
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33 #ifndef NO_GETWD
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34
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35 /* Default: Version for BSD systems -- use getwd() */
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36
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37 #include "sys/param.h"
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38
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39 extern char *getwd();
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40
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41 char *
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42 getcwd(buf, size)
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43 char *buf;
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44 int size;
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45 {
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46 char localbuf[MAXPATHLEN+1];
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47 char *ret;
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48
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49 if (size <= 0) {
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50 errno = EINVAL;
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51 return NULL;
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52 }
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53 ret = getwd(localbuf);
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54 if (ret != NULL && strlen(localbuf) >= size) {
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55 errno = ERANGE;
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56 return NULL;
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57 }
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58 if (ret == NULL) {
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59 errno = EACCES; /* Most likely error */
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60 return NULL;
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61 }
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62 strncpy(buf, localbuf, size);
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63 return buf;
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64 }
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65
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66 #else
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67
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68 /* NO_GETWD defined: Version for backward UNIXes -- popen /bin/pwd */
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69
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70 #define PWD_CMD "/bin/pwd"
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71
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72 char *
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73 getcwd(buf, size)
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74 char *buf;
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75 int size;
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76 {
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77 FILE *fp;
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78 char *p;
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79 int sts;
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80 if (size <= 0) {
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81 errno = EINVAL;
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82 return NULL;
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83 }
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84 if ((fp = popen(PWD_CMD, "r")) == NULL)
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85 return NULL;
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86 if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
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87 errno = EACCES; /* Most likely error */
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88 return NULL;
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89 }
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90 for (p = buf; *p != '\n'; p++) {
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91 if (*p == '\0') {
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92 errno = ERANGE;
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93 return NULL;
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94 }
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95 }
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96 *p = '\0';
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97 return buf;
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98 }
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99
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100 #endif