Imported Upstream version 93u+upstream

1 files changed, 128 insertions, 0 deletions

diff --git a/src/lib/libast/path/pathprog.c b/src/lib/libast/path/pathprog.c
new file mode 100644
index 0000000..ac29427
--- /dev/null
+++ b/src/lib/libast/path/pathprog.c
@@ -0,0 +1,128 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * Glenn Fowler
+ * AT&T Research
+ *
+ * return the full path of the current program in path
+ * command!=0 is used as a default
+ */
+
+#include <ast.h>
+
+#if _WINIX
+#include <ast_windows.h>
+#include <ctype.h>
+#endif
+
+#include "FEATURE/prog"
+
+#if _hdr_macho_o_dyld && _lib__NSGetExecutablePath
+#include <mach-o/dyld.h>
+#else
+#undef	_lib__NSGetExecutablePath
+#endif
+
+static size_t
+prog(const char* command, char* path, size_t size)
+{
+	ssize_t		n;
+	char*		s;
+#if _WINIX
+	char*		t;
+	char*		e;
+	int		c;
+	int		q;
+#endif
+#if _lib__NSGetExecutablePath
+	uint32_t	z;
+#endif
+
+#ifdef _PROC_PROG
+	if ((n = readlink(_PROC_PROG, path, size)) > 0 && *path == '/')
+	{
+		if (n < size)
+			path[n] = 0;
+		return n;
+	}
+#endif
+#if _lib_getexecname
+	if ((s = (char*)getexecname()) && *s == '/')
+		goto found;
+#endif
+#if _lib__NSGetExecutablePath
+	z = size;
+	if (!_NSGetExecutablePath(path, &z) && *s == '/')
+		return strlen(s);
+#endif
+#if _WINIX
+	if (s = GetCommandLine())
+	{
+		n = 0;
+		q = 0;
+		t = path;
+		e = path + size - 1;
+		while (c = *s++)
+		{
+			if (c == q)
+				q = 0;
+			else if (!q && c == '"')
+				q = c;
+			else if (!q && isspace(c))
+				break;
+			else if (t < e)
+				*t++ = c == '\\' ? '/' : c;
+			else
+				n++;
+		}
+		if (t < e)
+			*t = 0;
+		return (t - path) + n;
+	}
+#endif
+	if (command)
+	{
+		s = (char*)command;
+		goto found;
+	}
+	return 0;
+ found:
+	n = strlen(s);
+	if (n < size)
+		memcpy(path, s, n + 1);
+	return n;
+}
+
+size_t
+pathprog(const char* command, char* path, size_t size)
+{
+	char*		rel;
+	ssize_t		n;
+
+	if ((n = prog(command, path, size)) > 0 && n < size && *path != '/' && (rel = strdup(path)))
+	{
+		n = pathpath(rel, NiL, PATH_REGULAR|PATH_EXECUTE, path, size) ? strlen(path) : 0;
+		free(rel);
+	}
+	return n;
+}