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annotate Python/getcwd.c @ 1257:1cabc2b6c970 legacy-trunk

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* Changed all copyright messages to include 1993. * Stubs for faster implementation of local variables (not yet finished) * Added function name to code object. Print it for code and function objects. THIS MAKES THE .PYC FILE FORMAT INCOMPATIBLE (the version number has changed accordingly) * Print address of self for built-in methods * New internal functions getattro and setattro (getattr/setattr with string object arg) * Replaced "dictobject" with more powerful "mappingobject" * New per-type functio tp_hash to implement arbitrary object hashing, and hashobject() to interface to it * Added built-in functions hash(v) and hasattr(v, 'name') * classobject: made some functions static that accidentally weren't; added __hash__ special instance method to implement hash() * Added proper comparison for built-in methods and functions
author Guido van Rossum <guido@python.org>
date Mon, 29 Mar 1993 10:43:31 +0000
parents 0cd197947d81
children cd397266dc1c
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1 /***********************************************************
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2 Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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3 Amsterdam, 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 /* #define NO_GETWD /* Turn this on to popen pwd instead of calling getwd() */
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29
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30 #include <stdio.h>
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31 #include <errno.h>
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32
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33 extern int errno;
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34
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35 #ifndef NO_GETWD
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36
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37 /* Default: Version for BSD systems -- use getwd() */
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38
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39 #include "sys/param.h"
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40
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41 extern char *getwd();
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42
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43 char *
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44 getcwd(buf, size)
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45 char *buf;
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46 int size;
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47 {
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48 char localbuf[MAXPATHLEN+1];
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49 char *ret;
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50
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51 if (size <= 0) {
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52 errno = EINVAL;
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53 return NULL;
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54 }
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55 ret = getwd(localbuf);
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56 if (ret != NULL && strlen(localbuf) >= size) {
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57 errno = ERANGE;
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58 return NULL;
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59 }
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60 if (ret == NULL) {
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61 errno = EACCES; /* Most likely error */
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62 return NULL;
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63 }
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64 strncpy(buf, localbuf, size);
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65 return buf;
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66 }
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67
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68 #else
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69
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70 /* NO_GETWD defined: Version for backward UNIXes -- popen /bin/pwd */
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71
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72 #define PWD_CMD "/bin/pwd"
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73
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74 char *
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75 getcwd(buf, size)
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76 char *buf;
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77 int size;
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78 {
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79 FILE *fp;
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80 char *p;
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81 int sts;
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82 if (size <= 0) {
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83 errno = EINVAL;
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84 return NULL;
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85 }
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86 if ((fp = popen(PWD_CMD, "r")) == NULL)
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87 return NULL;
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88 if (fgets(buf, size, fp) == NULL || (sts = pclose(fp)) != 0) {
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89 errno = EACCES; /* Most likely error */
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90 return NULL;
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91 }
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92 for (p = buf; *p != '\n'; p++) {
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93 if (*p == '\0') {
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94 errno = ERANGE;
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95 return NULL;
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96 }
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97 }
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98 *p = '\0';
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99 return buf;
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100 }
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101
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102 #endif