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annotate Python/dynload_mac.c @ 15830:e00f718e4d8a legacy-trunk

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Two changes to from...import: 1) "from M import X" now works even if M is not a real module; it's basically a getattr() operation with AttributeError exceptions changed into ImportError. 2) "from M import *" now looks for M.__all__ to decide which names to import; if M.__all__ doesn't exist, it uses M.__dict__.keys() but filters out names starting with '_' as before. Whether or not __all__ exists, there's no restriction on the type of M.
author Guido van Rossum <guido@python.org>
date Fri, 12 Jan 2001 16:24:03 +0000
parents 50358d64dc43
children 90992c82d46e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1
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2 /* Support for dynamic loading of extension modules */
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3
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4 #include "Python.h"
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5 #include "importdl.h"
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6
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7 #include <Aliases.h>
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8 #include <CodeFragments.h>
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9 #ifdef USE_GUSI1
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10 #include "TFileSpec.h" /* for Path2FSSpec() */
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11 #endif
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12 #include <Files.h>
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13 #include <TextUtils.h>
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14 #include "macdefs.h"
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15 #include "macglue.h"
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16
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17
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18 const struct filedescr _PyImport_DynLoadFiletab[] = {
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19 {".slb", "rb", C_EXTENSION},
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20 #ifdef __CFM68K__
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21 {".CFM68K.slb", "rb", C_EXTENSION},
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22 #else
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23 {".ppc.slb", "rb", C_EXTENSION},
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24 #endif
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25 {0, 0}
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26 };
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28
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29 dl_funcptr _PyImport_GetDynLoadFunc(const char *fqname, const char *shortname,
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30 const char *pathname, FILE *fp)
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31 {
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32 dl_funcptr p;
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33 char funcname[258];
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34
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35 /*
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36 ** Dynamic loading of CFM shared libraries on the Mac. The
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37 ** code has become more convoluted than it was, because we
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38 ** want to be able to put multiple modules in a single
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39 ** file. For this reason, we have to determine the fragment
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40 ** name, and we cannot use the library entry point but we have
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41 ** to locate the correct init routine "by hand".
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42 */
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43 FSSpec libspec;
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44 CFragConnectionID connID;
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45 Ptr mainAddr;
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46 Str255 errMessage;
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47 OSErr err;
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48 #ifndef USE_GUSI1
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49 Boolean isfolder, didsomething;
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50 #endif
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51 char buf[512];
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52 Str63 fragname;
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53 Ptr symAddr;
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54 CFragSymbolClass class;
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55
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56 /* First resolve any aliases to find the real file */
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57 #ifdef USE_GUSI1
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58 err = Path2FSSpec(pathname, &libspec);
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59 #else
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60 c2pstrcpy((unsigned char *)buf, pathname);
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61 (void)FSMakeFSSpec(0, 0, (unsigned char *)buf, &libspec);
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62 err = ResolveAliasFile(&libspec, 1, &isfolder, &didsomething);
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63 #endif
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64 if ( err ) {
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65 sprintf(buf, "%.200s: %.200s", pathname, PyMac_StrError(err));
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66 PyErr_SetString(PyExc_ImportError, buf);
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67 return NULL;
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68 }
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69 /* Next, determine the fragment name,
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70 by stripping '.slb' and 'module' */
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71 memcpy(fragname+1, libspec.name+1, libspec.name[0]);
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72 fragname[0] = libspec.name[0];
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73 if( strncmp((char *)(fragname+1+fragname[0]-4),
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74 ".slb", 4) == 0 )
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75 fragname[0] -= 4;
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76 if ( strncmp((char *)(fragname+1+fragname[0]-6),
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77 "module", 6) == 0 )
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78 fragname[0] -= 6;
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79 /* Load the fragment
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80 (or return the connID if it is already loaded */
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81 err = GetDiskFragment(&libspec, 0, 0, fragname,
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82 kLoadCFrag, &connID, &mainAddr,
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83 errMessage);
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84 if ( err == cfragImportTooOldErr || err == cfragImportTooNewErr ) {
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85 /*
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86 ** Special-case code: if PythonCore is too old or too new this means
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87 ** the dynamic module was meant for a different Python.
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88 */
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89 if (errMessage[0] == 10 && strncmp((char *)errMessage+1, "PythonCore", 10) == 0 ) {
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90 sprintf(buf, "Dynamic module was built for %s version of MacPython",
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91 (err == cfragImportTooOldErr ? "a newer" : "an older"));
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92 PyErr_SetString(PyExc_ImportError, buf);
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93 return NULL;
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94 }
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95 }
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96 if ( err ) {
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97 sprintf(buf, "%.*s: %.200s",
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98 errMessage[0], errMessage+1,
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99 PyMac_StrError(err));
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100 PyErr_SetString(PyExc_ImportError, buf);
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101 return NULL;
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102 }
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103 /* Locate the address of the correct init function */
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104 sprintf(funcname, "init%.200s", shortname);
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105 err = FindSymbol(connID, Pstring(funcname), &symAddr, &class);
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106 if ( err ) {
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107 sprintf(buf, "%s: %.200s",
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108 funcname, PyMac_StrError(err));
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109 PyErr_SetString(PyExc_ImportError, buf);
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110 return NULL;
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111 }
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112 p = (dl_funcptr)symAddr;
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113
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114 return p;
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115 }