Files specific to Visual Age C for OS/2 -- by Jeff Rush
diff --git a/PC/os2vacpp/getpathp.c b/PC/os2vacpp/getpathp.c
new file mode 100644
index 0000000..2cfba16
--- /dev/null
+++ b/PC/os2vacpp/getpathp.c
@@ -0,0 +1,488 @@
+/***********************************************************
+Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
+The Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI or Corporation for National Research Initiatives or
+CNRI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior
+permission.
+
+While CWI is the initial source for this software, a modified version
+is made available by the Corporation for National Research Initiatives
+(CNRI) at the Internet address ftp://ftp.python.org.
+
+STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
+CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
+DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Return the initial module search path. */
+/* Used by DOS, OS/2, Windows 3.1. Works on NT too. */
+
+#include "Python.h"
+#include "osdefs.h"
+
+#ifdef MS_WIN32
+#include <windows.h>
+extern BOOL PyWin_IsWin32s();
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+
+#if HAVE_UNISTD_H
+#include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+/* Search in some common locations for the associated Python libraries.
+ *
+ * This version always returns "" for both prefix and exec_prefix.
+ *
+ * Py_GetPath() tries to return a sensible Python module search path.
+ *
+ * First, we look to see if the executable is in a subdirectory of
+ * the Python build directory. We calculate the full path of the
+ * directory containing the executable as progpath. We work backwards
+ * along progpath and look for $dir/Modules/Setup.in, a distinctive
+ * landmark. If found, we use $dir/Lib as $root. The returned
+ * Python path is the compiled #define PYTHONPATH with all the initial
+ * "./lib" replaced by $root.
+ *
+ * Otherwise, if there is a PYTHONPATH environment variable, we return that.
+ *
+ * Otherwise we try to find $progpath/lib/string.py, and if found, then
+ * root is $progpath/lib, and we return Python path as compiled PYTHONPATH
+ * with all "./lib" replaced by $root (as above).
+ *
+ */
+
+#ifndef LANDMARK
+#define LANDMARK "lib\\string.py"
+#endif
+
+static char prefix[MAXPATHLEN+1];
+static char progpath[MAXPATHLEN+1];
+static char *module_search_path = NULL;
+
+
+static int
+is_sep(ch) /* determine if "ch" is a separator character */
+ char ch;
+{
+#ifdef ALTSEP
+ return ch == SEP || ch == ALTSEP;
+#else
+ return ch == SEP;
+#endif
+}
+
+
+static void
+reduce(dir)
+ char *dir;
+{
+ int i = strlen(dir);
+ while (i > 0 && !is_sep(dir[i]))
+ --i;
+ dir[i] = '\0';
+}
+
+
+static int
+exists(filename)
+ char *filename;
+{
+ struct stat buf;
+ return stat(filename, &buf) == 0;
+}
+
+
+static void
+join(buffer, stuff)
+ char *buffer;
+ char *stuff;
+{
+ int n, k;
+ if (is_sep(stuff[0]))
+ n = 0;
+ else {
+ n = strlen(buffer);
+ if (n > 0 && !is_sep(buffer[n-1]) && n < MAXPATHLEN)
+ buffer[n++] = SEP;
+ }
+ k = strlen(stuff);
+ if (n + k > MAXPATHLEN)
+ k = MAXPATHLEN - n;
+ strncpy(buffer+n, stuff, k);
+ buffer[n+k] = '\0';
+}
+
+
+static int
+search_for_prefix(argv0_path, landmark)
+ char *argv0_path;
+ char *landmark;
+{
+ int n;
+
+ /* Search from argv0_path, until root is found */
+ strcpy(prefix, argv0_path);
+ do {
+ n = strlen(prefix);
+ join(prefix, landmark);
+ if (exists(prefix)) {
+ prefix[n] = '\0';
+ return 1;
+ }
+ prefix[n] = '\0';
+ reduce(prefix);
+ } while (prefix[0]);
+ return 0;
+}
+
+#ifdef MS_WIN32
+#include "malloc.h" // for alloca - see comments below!
+extern const char *PyWin_DLLVersionString; // a string loaded from the DLL at startup.
+
+
+/* Load a PYTHONPATH value from the registry.
+ Load from either HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER.
+
+ Returns NULL, or a pointer that should be freed.
+*/
+
+static char *
+getpythonregpath(HKEY keyBase, BOOL bWin32s)
+{
+ HKEY newKey = 0;
+ DWORD nameSize = 0;
+ DWORD dataSize = 0;
+ DWORD numEntries = 0;
+ LONG rc;
+ char *retval = NULL;
+ char *dataBuf;
+ const char keyPrefix[] = "Software\\Python\\PythonCore\\";
+ const char keySuffix[] = "\\PythonPath";
+ int versionLen;
+ char *keyBuf;
+
+ // Tried to use sysget("winver") but here is too early :-(
+ versionLen = strlen(PyWin_DLLVersionString);
+ // alloca == no free required, but memory only local to fn.
+ // also no heap fragmentation! Am I being silly?
+ keyBuf = alloca(sizeof(keyPrefix)-1 + versionLen + sizeof(keySuffix)); // chars only, plus 1 NULL.
+ // lots of constants here for the compiler to optimize away :-)
+ memcpy(keyBuf, keyPrefix, sizeof(keyPrefix)-1);
+ memcpy(keyBuf+sizeof(keyPrefix)-1, PyWin_DLLVersionString, versionLen);
+ memcpy(keyBuf+sizeof(keyPrefix)-1+versionLen, keySuffix, sizeof(keySuffix)); // NULL comes with this one!
+
+ rc=RegOpenKey(keyBase,
+ keyBuf,
+ &newKey);
+ if (rc==ERROR_SUCCESS) {
+ RegQueryInfoKey(newKey, NULL, NULL, NULL, NULL, NULL, NULL,
+ &numEntries, &nameSize, &dataSize, NULL, NULL);
+ }
+ if (bWin32s && numEntries==0 && dataSize==0) {
+ /* must hardcode for Win32s */
+ numEntries = 1;
+ dataSize = 511;
+ }
+ if (numEntries) {
+ /* Loop over all subkeys. */
+ /* Win32s doesnt know how many subkeys, so we do
+ it twice */
+ char keyBuf[MAX_PATH+1];
+ int index = 0;
+ int off = 0;
+ for(index=0;;index++) {
+ long reqdSize = 0;
+ DWORD rc = RegEnumKey(newKey,
+ index, keyBuf, MAX_PATH+1);
+ if (rc) break;
+ rc = RegQueryValue(newKey, keyBuf, NULL, &reqdSize);
+ if (rc) break;
+ if (bWin32s && reqdSize==0) reqdSize = 512;
+ dataSize += reqdSize + 1; /* 1 for the ";" */
+ }
+ dataBuf = malloc(dataSize+1);
+ if (dataBuf==NULL)
+ return NULL; /* pretty serious? Raise error? */
+ /* Now loop over, grabbing the paths.
+ Subkeys before main library */
+ for(index=0;;index++) {
+ int adjust;
+ long reqdSize = dataSize;
+ DWORD rc = RegEnumKey(newKey,
+ index, keyBuf,MAX_PATH+1);
+ if (rc) break;
+ rc = RegQueryValue(newKey,
+ keyBuf, dataBuf+off, &reqdSize);
+ if (rc) break;
+ if (reqdSize>1) {
+ /* If Nothing, or only '\0' copied. */
+ adjust = strlen(dataBuf+off);
+ dataSize -= adjust;
+ off += adjust;
+ dataBuf[off++] = ';';
+ dataBuf[off] = '\0';
+ dataSize--;
+ }
+ }
+ /* Additionally, win32s doesnt work as expected, so
+ the specific strlen() is required for 3.1. */
+ rc = RegQueryValue(newKey, "", dataBuf+off, &dataSize);
+ if (rc==ERROR_SUCCESS) {
+ if (strlen(dataBuf)==0)
+ free(dataBuf);
+ else
+ retval = dataBuf; /* caller will free */
+ }
+ else
+ free(dataBuf);
+ }
+
+ if (newKey)
+ RegCloseKey(newKey);
+ return retval;
+}
+#endif /* MS_WIN32 */
+
+static void
+get_progpath()
+{
+ extern char *Py_GetProgramName();
+ char *path = getenv("PATH");
+ char *prog = Py_GetProgramName();
+
+#ifdef MS_WIN32
+ if (GetModuleFileName(NULL, progpath, MAXPATHLEN))
+ return;
+#endif
+ if (prog == NULL || *prog == '\0')
+ prog = "python";
+
+ /* If there is no slash in the argv0 path, then we have to
+ * assume python is on the user's $PATH, since there's no
+ * other way to find a directory to start the search from. If
+ * $PATH isn't exported, you lose.
+ */
+#ifdef ALTSEP
+ if (strchr(prog, SEP) || strchr(prog, ALTSEP))
+#else
+ if (strchr(prog, SEP))
+#endif
+ strcpy(progpath, prog);
+ else if (path) {
+ while (1) {
+ char *delim = strchr(path, DELIM);
+
+ if (delim) {
+ int len = delim - path;
+ strncpy(progpath, path, len);
+ *(progpath + len) = '\0';
+ }
+ else
+ strcpy(progpath, path);
+
+ join(progpath, prog);
+ if (exists(progpath))
+ break;
+
+ if (!delim) {
+ progpath[0] = '\0';
+ break;
+ }
+ path = delim + 1;
+ }
+ }
+ else
+ progpath[0] = '\0';
+}
+
+static void
+calculate_path()
+{
+ char argv0_path[MAXPATHLEN+1];
+ char *buf;
+ int bufsz;
+ char *pythonhome = getenv("PYTHONHOME");
+ char *envpath = getenv("PYTHONPATH");
+#ifdef MS_WIN32
+ char *machinepath, *userpath;
+
+ /* Are we running under Windows 3.1(1) Win32s? */
+ if (PyWin_IsWin32s()) {
+ /* Only CLASSES_ROOT is supported */
+ machinepath = getpythonregpath(HKEY_CLASSES_ROOT, TRUE);
+ userpath = NULL;
+ } else {
+ machinepath = getpythonregpath(HKEY_LOCAL_MACHINE, FALSE);
+ userpath = getpythonregpath(HKEY_CURRENT_USER, FALSE);
+ }
+#endif
+
+ get_progpath();
+ strcpy(argv0_path, progpath);
+ reduce(argv0_path);
+ if (pythonhome == NULL || *pythonhome == '\0') {
+ if (search_for_prefix(argv0_path, LANDMARK))
+ pythonhome = prefix;
+ else
+ pythonhome = NULL;
+ }
+ else
+ strcpy(prefix, pythonhome);
+
+ if (envpath && *envpath == '\0')
+ envpath = NULL;
+
+ /* We need to construct a path from the following parts:
+ (1) the PYTHONPATH environment variable, if set;
+ (2) for Win32, the machinepath and userpath, if set;
+ (3) the PYTHONPATH config macro, with the leading "."
+ of each component replaced with pythonhome, if set;
+ (4) the directory containing the executable (argv0_path).
+ The length calculation calculates #3 first.
+ */
+
+ /* Calculate size of return buffer */
+ if (pythonhome != NULL) {
+ char *p;
+ bufsz = 1;
+ for (p = PYTHONPATH; *p; p++) {
+ if (*p == DELIM)
+ bufsz++; /* number of DELIM plus one */
+ }
+ bufsz *= strlen(pythonhome);
+ }
+ else
+ bufsz = 0;
+ bufsz += strlen(PYTHONPATH);
+ if (envpath != NULL)
+ bufsz += strlen(envpath) + 1;
+ bufsz += strlen(argv0_path) + 1;
+#ifdef MS_WIN32
+ if (machinepath)
+ bufsz += strlen(machinepath) + 1;
+ if (userpath)
+ bufsz += strlen(userpath) + 1;
+#endif
+
+ module_search_path = buf = malloc(bufsz);
+ if (buf == NULL) {
+ /* We can't exit, so print a warning and limp along */
+ fprintf(stderr, "Can't malloc dynamic PYTHONPATH.\n");
+ if (envpath) {
+ fprintf(stderr, "Using default static $PYTHONPATH.\n");
+ module_search_path = envpath;
+ }
+ else {
+ fprintf(stderr, "Using environment $PYTHONPATH.\n");
+ module_search_path = PYTHONPATH;
+ }
+ return;
+ }
+
+ if (envpath) {
+ strcpy(buf, envpath);
+ buf = strchr(buf, '\0');
+ *buf++ = DELIM;
+ }
+#ifdef MS_WIN32
+ if (machinepath) {
+ strcpy(buf, machinepath);
+ buf = strchr(buf, '\0');
+ *buf++ = DELIM;
+ }
+ if (userpath) {
+ strcpy(buf, userpath);
+ buf = strchr(buf, '\0');
+ *buf++ = DELIM;
+ }
+#endif
+ if (pythonhome == NULL) {
+ strcpy(buf, PYTHONPATH);
+ buf = strchr(buf, '\0');
+ }
+ else {
+ char *p = PYTHONPATH;
+ char *q;
+ int n;
+ for (;;) {
+ q = strchr(p, DELIM);
+ if (q == NULL)
+ n = strlen(p);
+ else
+ n = q-p;
+ if (p[0] == '.' && is_sep(p[1])) {
+ strcpy(buf, pythonhome);
+ buf = strchr(buf, '\0');
+ p++;
+ n--;
+ }
+ strncpy(buf, p, n);
+ buf += n;
+ if (q == NULL)
+ break;
+ *buf++ = DELIM;
+ p = q+1;
+ }
+ }
+ if (argv0_path) {
+ *buf++ = DELIM;
+ strcpy(buf, argv0_path);
+ buf = strchr(buf, '\0');
+ }
+ *buf = '\0';
+}
+
+
+/* External interface */
+
+char *
+Py_GetPath()
+{
+ if (!module_search_path)
+ calculate_path();
+
+ return module_search_path;
+}
+
+char *
+Py_GetPrefix()
+{
+ if (!module_search_path)
+ calculate_path();
+
+ return prefix;
+}
+
+char *
+Py_GetExecPrefix()
+{
+ return Py_GetPrefix();
+}
+
+char *
+Py_GetProgramFullPath()
+{
+ if (!module_search_path)
+ calculate_path();
+
+ return progpath;
+}