There's an ongoing project to bring some kind of path selection

mechanism to the ENGINE framework.  This means there there are going
to be new functionality for the DSO part, and ultimately some way of
merging two file specifications together.

This commit places the merging code into the repository.  It's
currently not used anywhere, and hasn't been tested at all.  It may be
full of errors, including syntactical ones.  Those will be fixed as
promptly as possible.

1 files changed, 302 insertions, 1 deletions

diff --git a/crypto/dso/dso_win32.c b/crypto/dso/dso_win32.c
index af8586d754..4ce9a5d45c 100644
--- a/crypto/dso/dso_win32.c
+++ b/crypto/dso/dso_win32.c
@@ -1,4 +1,4 @@
-/* dso_win32.c */
+/* dso_win32.c -*- mode:C; c-file-style: "eay" -*- */
 /* Written by Geoff Thorpe (geoff@geoffthorpe.net) for the OpenSSL
  * project 2000.
  */
@@ -83,6 +83,8 @@ static int win32_finish(DSO *dso);
 static long win32_ctrl(DSO *dso, int cmd, long larg, void *parg);
 #endif
 static char *win32_name_converter(DSO *dso, const char *filename);
+static char *win32_merger(DSO *dso, const char *filespec1,
+	const char *filespec2);
 
 static DSO_METHOD dso_meth_win32 = {
 	"OpenSSL 'win32' shared library method",
@@ -97,6 +99,7 @@ static DSO_METHOD dso_meth_win32 = {
 #endif
 	NULL, /* ctrl */
 	win32_name_converter,
+	win32_merger,
 	NULL, /* init */
 	NULL  /* finish */
 	};
@@ -248,6 +251,304 @@ static DSO_FUNC_TYPE win32_bind_func(DSO *dso, const char *symname)
 	return((DSO_FUNC_TYPE)sym);
 	}
 
+struct file_st
+	{
+	const char *node; int nodelen;
+	const char *device; int devicelen;
+	const char *predir; int predirlen;
+	const char *dir; int dirlen;
+	const char *file; int filelen;
+	}
+
+static struct file_st *win32_splitter(DSO *dso, const char *filename,
+	int assume_last_is_dir)
+	{
+	struct file_st *result = NULL;
+	enum { IN_NODE, IN_DEVICE, IN_FILE } position;
+	const char *start = filename;
+
+	if (!filename)
+		{
+		DSOerr(DSO_F_WIN32_MERGER,DSO_R_NO_FILENAME);
+		goto err;
+		}
+
+	result = OPENSSL_malloc(sizeof(struct file_st));
+	if(result == NULL)
+		{
+		DSOerr(DSO_F_WIN32_MERGER,
+			ERR_R_MALLOC_FAILURE);
+		return(NULL);
+		}
+
+	memset(result, 0, sizeof(struct file_st));
+	position = IN_DEVICE;
+
+	if(filename[0] == '\\' && filename[1] == '\\'
+		|| filename[0] == '/' && filename[1] == '/')
+		{
+		position = IN_NODE;
+		filename += 2;
+		start = filename;
+		result->node = start;
+		}
+
+	do
+		{
+		switch(filename[0])
+			{
+		case ':':
+			if(position != IN_DEVICE)
+				{
+				DSOerr(DSO_F_WIN32_MERGER,
+					DSO_R_INCORRECT_FILE_SYNTAX);
+				goto err;
+				}
+			result->device = start;
+			result->devicelen = filename - start;
+			position = IN_FILE;
+			start = ++filename;
+			result->dir = start;
+			break;
+		case '\\':
+		case '/':
+			if(position == IN_NODE)
+				{
+				result->nodelen = filename - start;
+				position = IN_FILE;
+				start = ++filename;
+				result->dir = start;
+				}
+			else
+				{
+				filename++;
+				result->dirlen += filename - start;
+				}
+			break;
+		case '\0':
+			if(position == IN_NODE)
+				{
+				result->nodelen = filename - start;
+				}
+			else
+				{
+				if(filename - start > 0)
+					{
+					if (assume_last_is_dir)
+						{
+						result->devicelen += filename - start;
+						}
+					else
+						{
+						result->file = start;
+						result->filelen = filename - start;
+						}
+					}
+				}
+			break;
+		default:
+			filename++;
+			break;
+			}
+		}
+	while(*filename);
+
+	if(!result->nodelen) result->node = NULL;
+	if(!result->devicelen) result->devicce = NULL;
+	if(!result->dirlen) result->dir = NULL;
+	if(!result->filelen) result->file = NULL;
+
+	return(result);
+	}
+
+static char *win32_joiner(DSO *dso, const file_st *file_split)
+	{
+	int len = 0, offset = 0;
+	char *result = NULL;
+	const char *start;
+
+	if(!file_split)
+		{
+		DSOerr(DSO_F_WIN32_MERGER,
+				ERR_R_PASSED_NULL_PARAMETER);
+		return(NULL);
+		}
+	if(file_split->node)
+		{
+		len += 2 + file_split->nodelen;	/* 2 for starting \\ */
+		if(file_split->predir || file_split->dir || file_split->file)
+			len++;	/* 1 for ending \ */
+		}
+	else if(file_split->device)
+		{
+		len += file_split->devicelen + 1; /* 1 for ending : */
+		}
+	len += file_split->predirlen;
+	if(file_split->predir && (file_split->dir || file_split->file))
+		{
+		len++;	/* 1 for ending \ */
+		}
+	len += file_split->dirlen;
+	if(file_split->dir && file_split->file)
+		{
+		len++;	/* 1 for ending \ */
+		}
+	len += file_split->filelen;
+
+	if(!len)
+		{
+		DSOerr(DSO_F_WIN32_MERGER, DSO_R_EMPTY_FILE_STRUCTURE);
+		return(NULL);
+		}
+
+	result = OPENSSL_malloc(len + 1);
+	if (!result)
+		{
+		DSOerr(DSO_F_WIN32_MERGER,
+			ERR_R_MALLOC_FAILURE);
+		return(NULL);
+		}
+
+	if(file_split->node)
+		{
+		strcpy(&result[offset], "\\\\"); offset += 2;
+		strncpy(&result[offset], file_split->node,
+			file_split->nodelen); offset += file_split->nodelen;
+		if(file_split->predir || file_split->dir || file_split->file)
+			{
+			result[offset] = '\\'; offset++;
+			}
+		}
+	else if(file_split->device)
+		{
+		strncpy(&result[offset], file_split->device,
+			file_split->devicelen); offset += file_split->devicelen;
+		result[offset] = ':'; offset++;
+		}
+	start = file_split->predir;
+	while(file_split->predirlen > (start - file_split->predir))
+		{
+		const char *end = strnchr(start, '/',
+			file_split->predirlen - (start - file_split->predir));
+		if(!end)
+			end = start
+				+ file_split->predirlen
+				- (start - file_split->predir);
+		strncpy(&result[offset], start,
+			end - start); offset += end - start;
+		result[offset] = '\\'; offset++;
+		start = end + 1;
+		}
+	if(file_split->predir && (file_split->dir || file_split->file))
+		{
+		result[offset] = '\\'; offset++;
+		}
+	start = file_split->dir;
+	while(file_split->dirlen > (start - file_split->dir))
+		{
+		const char *end = strnchr(start, '/',
+			file_split->dirlen - (start - file_split->dir));
+		if(!end)
+			end = start
+				+ file_split->dirlen
+				- (start - file_split->dir);
+		strncpy(&result[offset], start,
+			end - start); offset += end - start;
+		result[offset] = '\\'; offset++;
+		start = end + 1;
+		}
+	if(file_split->dir && file_split->file)
+		{
+		result[offset] = '\\'; offset++;
+		}
+	strncpy(&result[offset], file_split->file,
+		file_split->filelen); offset += file_split->filelen;
+	result[offset] = '\0';
+	return(result);
+	}
+
+static char *win32_merger(DSO *dso, const char *filespec1, const char *filespec2)
+	{
+	char *merged = NULL;
+	struct file_st *filespec1_split = NULL;
+	struct file_st *filespec2_split = NULL;
+
+	if(!filespec1 && !filespec2)
+		{
+		DSOerr(DSO_F_WIN32_MERGER,
+				ERR_R_PASSED_NULL_PARAMETER);
+		return(NULL);
+		}
+	if (!filespec2)
+		{
+		merged = OPENSSL_malloc(strlen(filespec1) + 1);
+		if(!merged)
+			{
+			DSOerr(DSO_F_WIN32_MERGER,
+				ERR_R_MALLOC_FAILURE);
+			return(NULL);
+			}
+		strcpy(merged, filespec1);
+		}
+	else if (!filespec1)
+		{
+		merged = OPENSSL_malloc(strlen(filespec2) + 1);
+		if(!merged)
+			{
+			DSOerr(DSO_F_WIN32_MERGER,
+				ERR_R_MALLOC_FAILURE);
+			return(NULL);
+			}
+		strcpy(merged, filespec2);
+		}
+	else
+		{
+		filespec1_split = win32_splitter(dso, filespec1, 1);
+		if (!filespec1_split)
+			{
+			DSOerr(DSO_F_WIN32_MERGER,
+				ERR_R_MALLOC_FAILURE);
+			return(NULL);
+			}
+		filespec2_split = win32_splitter(dso, filespec2, 0);
+		if (!filespec1_split)
+			{
+			DSOerr(DSO_F_WIN32_MERGER,
+				ERR_R_MALLOC_FAILURE);
+			OPENSSL_free(filespec1_split);
+			return(NULL);
+			}
+
+		/* Fill in into filespec1_split */
+		if (!filespec1_split->node && !filespec1_split->device)
+			{
+			filespec1_split->node = filespec2_split->node;
+			filespec1_split->nodelen = filespec2_split->nodelen;
+			filespec1_split->device = filespec2_split->device;
+			filespec1_split->devicelen = filespec2_split->devicelen;
+			}
+		if (!filespec1_split->dir)
+			{
+			filespec1_split->dir = filespec2_split->dir;
+			filespec1_split->dirlen = filespec2_split->dirlen;
+			}
+		else if (filespec1_split->dir[0] != '\\'
+			&& filespec1_split->dir[0] != '/')
+			{
+			filespec1_split->predir = filespec2_split->dir;
+			filespec1_split->predirlen = filespec2_split->dirlen;
+			}
+		if (!filespec1_split->file)
+			{
+			filespec1_split->file = filespec2_split->file;
+			filespec1_split->filelen = filespec2_split->filelen;
+			}
+
+		merged = win32_joiner(dso, filespec1_split);
+		}
+	return(merged);
+	}
+
 static char *win32_name_converter(DSO *dso, const char *filename)
 	{
 	char *translated;