Files specific to Visual Age C for OS/2 -- by Jeff Rush

1 files changed, 488 insertions, 0 deletions

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;
+}