Mercurial > cpython-lru_cache-weakref

annotate Python/getcwd.c @ 3930:52c19ee83a6b legacy-trunk

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Guido's 1.4b2 fixes: Py_GetProgramName, Py_GetPrefix and Py_GetExecPrefix.
author Jack Jansen <jack.jansen@cwi.nl>
date Fri, 02 Aug 1996 15:16:16 +0000
parents d0d0a69b5ca3
children 65d2d8e67da3
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 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 #include <stdio.h>
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29 #include <errno.h>
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30
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31 #ifdef HAVE_GETWD
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32
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33 /* Version for BSD systems -- use getwd() */
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34
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35 #ifdef HAVE_SYS_PARAM_H
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36 #include <sys/param.h>
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37 #endif
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38
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39 #ifndef MAXPATHLEN
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40 #define MAXPATHLEN 1024
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41 #endif
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42
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43 extern char *getwd();
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44
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45 char *
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46 getcwd(buf, size)
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47 char *buf;
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48 int size;
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49 {
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50 char localbuf[MAXPATHLEN+1];
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51 char *ret;
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52
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53 if (size <= 0) {
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54 errno = EINVAL;
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55 return NULL;
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56 }
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57 ret = getwd(localbuf);
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58 if (ret != NULL && strlen(localbuf) >= size) {
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59 errno = ERANGE;
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60 return NULL;
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61 }
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62 if (ret == NULL) {
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63 errno = EACCES; /* Most likely error */
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64 return NULL;
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65 }
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66 strncpy(buf, localbuf, size);
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67 return buf;
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68 }
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69
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70 #else /* !HAVE_GETWD */
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71
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72 /* Version for really old UNIX systems -- use pipe from pwd */
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73
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74 #ifndef PWD_CMD
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75 #define PWD_CMD "/bin/pwd"
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76 #endif
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77
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78 char *
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79 getcwd(buf, size)
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80 char *buf;
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81 int size;
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82 {
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83 FILE *fp;
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84 char *p;
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85 int sts;
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86 if (size <= 0) {
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87 errno = EINVAL;
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88 return NULL;
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89 }
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90 if ((fp = popen(PWD_CMD, "r")) == NULL)
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91 return NULL;
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92 if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
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93 errno = EACCES; /* Most likely error */
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94 return NULL;
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95 }
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96 for (p = buf; *p != '\n'; p++) {
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97 if (*p == '\0') {
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98 errno = ERANGE;
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99 return NULL;
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100 }
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101 }
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102 *p = '\0';
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103 return buf;
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104 }
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105
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106 #endif /* !HAVE_GETWD */