Mercurial > cpython-lru_cache-weakref

annotate Python/getcwd.c @ 80661:94de77bd0b4b 2.7

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Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents b36cb4602e21
children
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1
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2 /* Two PD getcwd() implementations.
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3 Author: Guido van Rossum, CWI Amsterdam, Jan 1991, <guido@cwi.nl>. */
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4
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5 #include <stdio.h>
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6 #include <errno.h>
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7
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8 #ifdef HAVE_GETWD
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9
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10 /* Version for BSD systems -- use getwd() */
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11
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12 #ifdef HAVE_SYS_PARAM_H
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13 #include <sys/param.h>
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14 #endif
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15
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16 #ifndef MAXPATHLEN
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17 #if defined(PATH_MAX) && PATH_MAX > 1024
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18 #define MAXPATHLEN PATH_MAX
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19 #else
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20 #define MAXPATHLEN 1024
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21 #endif
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22 #endif
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24 extern char *getwd(char *);
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25
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26 char *
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27 getcwd(char *buf, int size)
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28 {
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29 char localbuf[MAXPATHLEN+1];
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30 char *ret;
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31
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32 if (size <= 0) {
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33 errno = EINVAL;
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34 return NULL;
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35 }
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36 ret = getwd(localbuf);
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37 if (ret != NULL && strlen(localbuf) >= (size_t)size) {
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38 errno = ERANGE;
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39 return NULL;
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40 }
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41 if (ret == NULL) {
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42 errno = EACCES; /* Most likely error */
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43 return NULL;
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44 }
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45 strncpy(buf, localbuf, size);
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46 return buf;
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47 }
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48
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49 #else /* !HAVE_GETWD */
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50
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51 /* Version for really old UNIX systems -- use pipe from pwd */
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53 #ifndef PWD_CMD
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54 #define PWD_CMD "/bin/pwd"
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55 #endif
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57 char *
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58 getcwd(char *buf, int size)
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59 {
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60 FILE *fp;
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61 char *p;
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62 if (size <= 0) {
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63 errno = EINVAL;
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64 return NULL;
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65 }
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66 if ((fp = popen(PWD_CMD, "r")) == NULL)
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67 return NULL;
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68 if (fgets(buf, size, fp) == NULL || pclose(fp) != 0) {
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69 errno = EACCES; /* Most likely error */
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70 return NULL;
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71 }
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72 for (p = buf; *p != '\n'; p++) {
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73 if (*p == '\0') {
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74 errno = ERANGE;
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75 return NULL;
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76 }
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77 }
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78 *p = '\0';
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79 return buf;
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80 }
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81
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82 #endif /* !HAVE_GETWD */