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annotate Python/getcwd.c @ 13255:916fb024ce94 legacy-trunk

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Change copyright notice.
author Guido van Rossum <guido@python.org>
date Fri, 30 Jun 2000 23:50:40 +0000
parents 8c8de5b736dc
children 87ee82e5c56d
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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 Copyright (c) 2000, BeOpen.com.
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8 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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9 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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10 All rights reserved.
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11
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12 See the file "Misc/COPYRIGHT" for information on usage and
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13 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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14
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15 ******************************************************************/
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16
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17 /* Two PD getcwd() implementations.
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18 Author: Guido van Rossum, CWI Amsterdam, Jan 1991, <guido@cwi.nl>. */
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19
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20 #include <stdio.h>
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21 #include <errno.h>
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22
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23 #ifdef HAVE_GETWD
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24
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25 /* Version for BSD systems -- use getwd() */
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26
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27 #ifdef HAVE_SYS_PARAM_H
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28 #include <sys/param.h>
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29 #endif
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30
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31 #ifndef MAXPATHLEN
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32 #define MAXPATHLEN 1024
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33 #endif
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34
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35 extern char *getwd();
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36
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37 char *
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38 getcwd(buf, size)
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39 char *buf;
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40 int size;
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41 {
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42 char localbuf[MAXPATHLEN+1];
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43 char *ret;
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44
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45 if (size <= 0) {
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46 errno = EINVAL;
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47 return NULL;
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48 }
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49 ret = getwd(localbuf);
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50 if (ret != NULL && strlen(localbuf) >= (size_t)size) {
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51 errno = ERANGE;
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52 return NULL;
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53 }
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54 if (ret == NULL) {
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55 errno = EACCES; /* Most likely error */
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56 return NULL;
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57 }
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58 strncpy(buf, localbuf, size);
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59 return buf;
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60 }
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61
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62 #else /* !HAVE_GETWD */
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63
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64 /* Version for really old UNIX systems -- use pipe from pwd */
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65
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66 #ifndef PWD_CMD
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67 #define PWD_CMD "/bin/pwd"
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68 #endif
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70 char *
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71 getcwd(buf, size)
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72 char *buf;
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73 int size;
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74 {
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75 FILE *fp;
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76 char *p;
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77 int sts;
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78 if (size <= 0) {
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79 errno = EINVAL;
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80 return NULL;
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81 }
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82 if ((fp = popen(PWD_CMD, "r")) == NULL)
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83 return NULL;
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84 if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
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85 errno = EACCES; /* Most likely error */
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86 return NULL;
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87 }
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88 for (p = buf; *p != '\n'; p++) {
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89 if (*p == '\0') {
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90 errno = ERANGE;
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91 return NULL;
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92 }
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93 }
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94 *p = '\0';
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95 return buf;
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96 }
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97
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98 #endif /* !HAVE_GETWD */