Mercurial > cpython-lru_cache-weakref

annotate Python/getcwd.c @ 13778:f6e4a9dd67cd legacy-trunk

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Rename the "parser" package to "parsers" to be compatible with the PyXML project.
author Fred Drake <fdrake@acm.org>
date Mon, 31 Jul 2000 23:59:54 +0000
parents f79434ee41fa
children 6f6f965c5e2d
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1 /***********************************************************
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2 Copyright (c) 2000, BeOpen.com.
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3 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
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4 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
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5 All rights reserved.
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6
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7 See the file "Misc/COPYRIGHT" for information on usage and
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8 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
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9 ******************************************************************/
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10
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11 /* Two PD getcwd() implementations.
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12 Author: Guido van Rossum, CWI Amsterdam, Jan 1991, <guido@cwi.nl>. */
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13
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14 #include <stdio.h>
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15 #include <errno.h>
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16
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17 #ifdef HAVE_GETWD
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18
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19 /* Version for BSD systems -- use getwd() */
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20
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21 #ifdef HAVE_SYS_PARAM_H
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22 #include <sys/param.h>
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23 #endif
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24
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25 #ifndef MAXPATHLEN
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26 #define MAXPATHLEN 1024
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27 #endif
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28
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29 extern char *getwd(char *);
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30
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31 char *
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32 getcwd(char *buf, int size)
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33 {
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34 char localbuf[MAXPATHLEN+1];
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35 char *ret;
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36
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37 if (size <= 0) {
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38 errno = EINVAL;
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39 return NULL;
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40 }
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41 ret = getwd(localbuf);
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42 if (ret != NULL && strlen(localbuf) >= (size_t)size) {
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43 errno = ERANGE;
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44 return NULL;
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45 }
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46 if (ret == NULL) {
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47 errno = EACCES; /* Most likely error */
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48 return NULL;
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49 }
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50 strncpy(buf, localbuf, size);
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51 return buf;
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52 }
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53
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54 #else /* !HAVE_GETWD */
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55
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56 /* Version for really old UNIX systems -- use pipe from pwd */
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57
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58 #ifndef PWD_CMD
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59 #define PWD_CMD "/bin/pwd"
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60 #endif
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62 char *
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63 getcwd(char *buf, int size)
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64 {
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65 FILE *fp;
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66 char *p;
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67 int sts;
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68 if (size <= 0) {
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69 errno = EINVAL;
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70 return NULL;
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71 }
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72 if ((fp = popen(PWD_CMD, "r")) == NULL)
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73 return NULL;
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74 if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
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75 errno = EACCES; /* Most likely error */
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76 return NULL;
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77 }
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78 for (p = buf; *p != '\n'; p++) {
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79 if (*p == '\0') {
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80 errno = ERANGE;
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81 return NULL;
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82 }
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83 }
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84 *p = '\0';
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85 return buf;
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86 }
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87
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88 #endif /* !HAVE_GETWD */