filesplitter.cpp@ 93115

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1	/* $Id: filesplitter.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
2	/** @file
3	* File splitter - Splits a text file according to ###### markers in it.
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#include <sys/types.h>
23	#include <sys/stat.h>
24	#include <stdio.h>
25	#include <stdlib.h>
26	#include <errno.h>
27
28	#include <iprt/string.h>
29	#include <iprt/stdarg.h>
30
31
32	/*********************************************************************************************************************************
33	* Defined Constants And Macros *
34	*********************************************************************************************************************************/
35	#ifndef S_ISDIR
36	# define S_ISDIR(a_fMode) ( (S_IFMT & (a_fMode)) == S_IFDIR )
37	#endif
38
39
40	/**
41	* Calculates the line number for a file position.
42	*
43	* @returns Line number.
44	* @param pcszContent The file content.
45	* @param pcszPos The current position.
46	*/
47	static unsigned long lineNumber(const char pcszContent, const char pcszPos)
48	{
49	unsigned long cLine = 0;
50	while ( *pcszContent
51	&& (uintptr_t)pcszContent < (uintptr_t)pcszPos)
52	{
53	pcszContent = strchr(pcszContent, '\n');
54	if (!pcszContent)
55	break;
56	++cLine;
57	++pcszContent;
58	}
59
60	return cLine;
61	}
62
63
64	/**
65	* Writes an error message.
66	*
67	* @returns RTEXITCODE_FAILURE.
68	* @param pcszFormat Error message.
69	* @param ... Format argument referenced in the message.
70	*/
71	static int printErr(const char *pcszFormat, ...)
72	{
73	va_list va;
74
75	fprintf(stderr, "filesplitter: ");
76	va_start(va, pcszFormat);
77	vfprintf(stderr, pcszFormat, va);
78	va_end(va);
79
80	return RTEXITCODE_FAILURE;
81	}
82
83
84	/**
85	* Opens the makefile list for writing.
86	*
87	* @returns Exit code.
88	* @param pcszPath The path to the file.
89	* @param pcszVariableName The make variable name.
90	* @param ppFile Where to return the file stream.
91	*/
92	static int openMakefileList(const char pcszPath, const char pcszVariableName, FILE **ppFile)
93	{
94	*ppFile = NULL;
95
96	FILE *pFile= fopen(pcszPath, "w");
97	if (!pFile)
98	#ifdef _MSC_VER
99	return printErr("Failed to open \"%s\" for writing the file list: %s (win32: %d)\n",
100	pcszPath, strerror(errno), _doserrno);
101	#else
102	return printErr("Failed to open \"%s\" for writing the file list: %s\n", pcszPath, strerror(errno));
103	#endif
104
105	if (fprintf(pFile, "%s := \\\n", pcszVariableName) <= 0)
106	{
107	fclose(pFile);
108	return printErr("Error writing to the makefile list.\n");
109	}
110
111	*ppFile = pFile;
112	return 0;
113	}
114
115
116	/**
117	* Adds the given file to the makefile list.
118	*
119	* @returns Exit code.
120	* @param pFile The file stream of the makefile list.
121	* @param pszFilename The file name to add.
122	*/
123	static int addFileToMakefileList(FILE pFile, char pszFilename)
124	{
125	if (pFile)
126	{
127	char *pszSlash = pszFilename;
128	while ((pszSlash = strchr(pszSlash, '\\')) != NULL)
129	*pszSlash++ = '/';
130
131	if (fprintf(pFile, "\t%s \\\n", pszFilename) <= 0)
132	return printErr("Error adding file to makefile list.\n");
133	}
134	return 0;
135	}
136
137
138	/**
139	* Closes the makefile list.
140	*
141	* @returns Exit code derived from @a rc.
142	* @param pFile The file stream of the makefile list.
143	* @param rc The current exit code.
144	*/
145	static int closeMakefileList(FILE *pFile, int rc)
146	{
147	fprintf(pFile, "\n\n");
148	if (fclose(pFile))
149	return printErr("Error closing the file list file: %s\n", strerror(errno));
150	return rc;
151	}
152
153
154	/**
155	* Reads in a file.
156	*
157	* @returns Exit code.
158	* @param pcszFile The path to the file.
159	* @param ppszFile Where to return the buffer.
160	* @param pcchFile Where to return the file size.
161	*/
162	static int readFile(const char pcszFile, char ppszFile, size_t pcchFile)
163	{
164	FILE *pFile;
165	struct stat FileStat;
166	int rc;
167
168	if (stat(pcszFile, &FileStat))
169	return printErr("Failed to stat \"%s\": %s\n", pcszFile, strerror(errno));
170
171	pFile = fopen(pcszFile, "r");
172	if (!pFile)
173	return printErr("Failed to open \"%s\": %s\n", pcszFile, strerror(errno));
174
175	ppszFile = (char )malloc(FileStat.st_size + 1);
176	if (*ppszFile)
177	{
178	errno = 0;
179	size_t cbRead = fread(*ppszFile, 1, FileStat.st_size, pFile);
180	if ( cbRead <= (size_t)FileStat.st_size
181	&& (cbRead > 0 \|\| !ferror(pFile)) )
182	{
183	if (ftell(pFile) == FileStat.st_size) /* (\r\n vs \n in the DOS world) */
184	{
185	(*ppszFile)[cbRead] = '\0';
186	if (pcchFile)
187	*pcchFile = (size_t)cbRead;
188
189	fclose(pFile);
190	return 0;
191	}
192	}
193
194	rc = printErr("Error reading \"%s\": %s\n", pcszFile, strerror(errno));
195	free(*ppszFile);
196	*ppszFile = NULL;
197	}
198	else
199	rc = printErr("Failed to allocate %lu bytes\n", (unsigned long)(FileStat.st_size + 1));
200	fclose(pFile);
201	return rc;
202	}
203
204
205	/**
206	* Checks whether the sub-file already exists and has the exact
207	* same content.
208	*
209	* @returns @c true if the existing file matches exactly, otherwise @c false.
210	* @param pcszFilename The path to the file.
211	* @param pcszSubContent The content to write.
212	* @param cchSubContent The length of the content.
213	*/
214	static bool compareSubFile(const char pcszFilename, const char pcszSubContent, size_t cchSubContent)
215	{
216	struct stat FileStat;
217	if (stat(pcszFilename, &FileStat))
218	return false;
219	if ((size_t)FileStat.st_size < cchSubContent)
220	return false;
221
222	size_t cchExisting;
223	char *pszExisting;
224	int rc = readFile(pcszFilename, &pszExisting, &cchExisting);
225	if (rc)
226	return false;
227
228	bool fRc = cchExisting == cchSubContent
229	&& !memcmp(pcszSubContent, pszExisting, cchSubContent);
230	free(pszExisting);
231
232	return fRc;
233	}
234
235
236	/**
237	* Writes out a sub-file.
238	*
239	* @returns exit code.
240	* @param pcszFilename The path to the sub-file.
241	* @param pcszSubContent The content of the file.
242	* @param cchSubContent The size of the content.
243	*/
244	static int writeSubFile(const char pcszFilename, const char pcszSubContent, size_t cchSubContent)
245	{
246	FILE *pFile = fopen(pcszFilename, "w");
247	if (!pFile)
248	#ifdef _MSC_VER
249	return printErr("Failed to open \"%s\" for writing: %s (win32: %d)\n", pcszFilename, strerror(errno), _doserrno);
250	#else
251	return printErr("Failed to open \"%s\" for writing: %s\n", pcszFilename, strerror(errno));
252	#endif
253
254	errno = 0;
255	int rc = 0;
256	if (fwrite(pcszSubContent, cchSubContent, 1, pFile) != 1)
257	rc = printErr("Error writing \"%s\": %s\n", pcszFilename, strerror(errno));
258
259	errno = 0;
260	int rc2 = fclose(pFile);
261	if (rc2 == EOF)
262	rc = printErr("Error closing \"%s\": %s\n", pcszFilename, strerror(errno));
263	return rc;
264	}
265
266
267	/**
268	* Does the actual file splitting.
269	*
270	* @returns exit code.
271	* @param pcszOutDir Path to the output directory.
272	* @param pcszContent The content to split up.
273	* @param pFileList The file stream of the makefile list. Can be NULL.
274	*/
275	static int splitFile(const char pcszOutDir, const char pcszContent, FILE *pFileList)
276	{
277	static char const s_szBeginMarker[] = "\n// ##### BEGINFILE \"";
278	static char const s_szEndMarker[] = "\n// ##### ENDFILE";
279	const size_t cchBeginMarker = sizeof(s_szBeginMarker) - 1;
280	const char *pcszSearch = pcszContent;
281	size_t const cchOutDir = strlen(pcszOutDir);
282	unsigned long cFilesWritten = 0;
283	unsigned long cFilesUnchanged = 0;
284	int rc = 0;
285
286	do
287	{
288	/* find begin marker */
289	const char *pcszBegin = strstr(pcszSearch, s_szBeginMarker);
290	if (!pcszBegin)
291	break;
292
293	/* find line after begin marker */
294	const char *pcszLineAfterBegin = strchr(pcszBegin + cchBeginMarker, '\n');
295	if (!pcszLineAfterBegin)
296	return printErr("No newline after begin-file marker found.\n");
297	++pcszLineAfterBegin;
298
299	/* find filename end quote in begin marker line */
300	const char *pcszStartFilename = pcszBegin + cchBeginMarker;
301	const char pcszEndQuote = (const char )memchr(pcszStartFilename, '\"', pcszLineAfterBegin - pcszStartFilename);
302	if (!pcszEndQuote)
303	return printErr("Can't parse filename after begin-file marker (line %lu).\n",
304	lineNumber(pcszContent, s_szBeginMarker));
305
306	/* find end marker */
307	const char *pcszEnd = strstr(pcszLineAfterBegin, s_szEndMarker);
308	if (!pcszEnd)
309	return printErr("No matching end-line marker for begin-file marker found (line %lu).\n",
310	lineNumber(pcszContent, s_szBeginMarker));
311
312	/* construct output filename */
313	size_t cchFilename = pcszEndQuote - pcszStartFilename;
314	char pszFilename = (char )malloc(cchOutDir + 1 + cchFilename + 1);
315	if (!pszFilename)
316	return printErr("Can't allocate memory for filename.\n");
317
318	memcpy(pszFilename, pcszOutDir, cchOutDir);
319	pszFilename[cchOutDir] = '/';
320	memcpy(pszFilename + cchOutDir + 1, pcszStartFilename, cchFilename);
321	pszFilename[cchFilename + 1 + cchOutDir] = '\0';
322
323	/* Write the file only if necessary. */
324	if (compareSubFile(pszFilename, pcszLineAfterBegin, pcszEnd - pcszLineAfterBegin))
325	cFilesUnchanged++;
326	else
327	{
328	rc = writeSubFile(pszFilename, pcszLineAfterBegin, pcszEnd - pcszLineAfterBegin);
329	cFilesWritten++;
330	}
331
332	if (!rc)
333	rc = addFileToMakefileList(pFileList, pszFilename);
334
335	free(pszFilename);
336
337	pcszSearch = pcszEnd;
338	} while (rc == 0 && pcszSearch);
339
340	printf("filesplitter: Out of %lu files: %lu rewritten, %lu unchanged. (%s)\n",
341	cFilesWritten + cFilesUnchanged, cFilesWritten, cFilesUnchanged, pcszOutDir);
342	return rc;
343	}
344
345
346	int main(int argc, char *argv[])
347	{
348	int rc = 0;
349
350	if (argc == 3 \|\| argc == 5)
351	{
352	struct stat DirStat;
353	if ( stat(argv[2], &DirStat) == 0
354	&& S_ISDIR(DirStat.st_mode))
355	{
356	char *pszContent;
357	rc = readFile(argv[1], &pszContent, NULL);
358	if (!rc)
359	{
360	FILE *pFileList = NULL;
361	if (argc == 5)
362	rc = openMakefileList(argv[3], argv[4], &pFileList);
363
364	if (argc < 4 \|\| pFileList)
365	rc = splitFile(argv[2], pszContent, pFileList);
366
367	if (pFileList)
368	rc = closeMakefileList(pFileList, rc);
369	free(pszContent);
370	}
371	}
372	else
373	rc = printErr("Given argument \"%s\" is not a valid directory.\n", argv[2]);
374	}
375	else
376	rc = printErr("Syntax error: usage: filesplitter <infile> <outdir> [<list.kmk> <kmkvar>]\n");
377	return rc;
378	}

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source: vbox/trunk/src/bldprogs/filesplitter.cpp@ 93115

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