Mercurial > cpython-lru_cache-weakref

annotate Python/getcwd.c @ 20737:00a581bdedeb legacy-trunk

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When overriding __str__ or __repr__, set the tp_print slot to NULL.
author Guido van Rossum <guido@python.org>
date Mon, 29 Oct 2001 14:33:44 +0000
parents 6f6f965c5e2d
children b535c191a44b
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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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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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16 #ifndef MAXPATHLEN
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17 #define MAXPATHLEN 1024
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18 #endif
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19
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20 extern char *getwd(char *);
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21
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22 char *
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23 getcwd(char *buf, int size)
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24 {
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25 char localbuf[MAXPATHLEN+1];
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26 char *ret;
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27
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28 if (size <= 0) {
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29 errno = EINVAL;
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30 return NULL;
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31 }
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32 ret = getwd(localbuf);
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33 if (ret != NULL && strlen(localbuf) >= (size_t)size) {
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34 errno = ERANGE;
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35 return NULL;
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36 }
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37 if (ret == NULL) {
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38 errno = EACCES; /* Most likely error */
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39 return NULL;
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40 }
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41 strncpy(buf, localbuf, size);
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42 return buf;
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43 }
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44
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45 #else /* !HAVE_GETWD */
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46
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47 /* Version for really old UNIX systems -- use pipe from pwd */
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48
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49 #ifndef PWD_CMD
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50 #define PWD_CMD "/bin/pwd"
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51 #endif
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53 char *
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54 getcwd(char *buf, int size)
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55 {
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56 FILE *fp;
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57 char *p;
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58 int sts;
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59 if (size <= 0) {
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60 errno = EINVAL;
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61 return NULL;
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62 }
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63 if ((fp = popen(PWD_CMD, "r")) == NULL)
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64 return NULL;
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65 if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
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66 errno = EACCES; /* Most likely error */
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67 return NULL;
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68 }
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69 for (p = buf; *p != '\n'; p++) {
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70 if (*p == '\0') {
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71 errno = ERANGE;
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72 return NULL;
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73 }
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74 }
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75 *p = '\0';
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76 return buf;
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77 }
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78
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79 #endif /* !HAVE_GETWD */