filesplitter.cpp@ 100881

Last change on this file since 100881 was 98103, checked in by vboxsync, 2 years ago
Copyright year updates by scm.
Property svn:eol-style set to `native` Property svn:keywords set to `Id Revision`
File size: 12.1 KB

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1	/* $Id: filesplitter.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* File splitter - Splits a text file according to ###### markers in it.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#include <sys/types.h>
33	#include <sys/stat.h>
34	#include <stdio.h>
35	#include <stdlib.h>
36	#include <errno.h>
37
38	#include <iprt/string.h>
39	#include <iprt/stdarg.h>
40
41
42	/*********************************************************************************************************************************
43	* Defined Constants And Macros *
44	*********************************************************************************************************************************/
45	#ifndef S_ISDIR
46	# define S_ISDIR(a_fMode) ( (S_IFMT & (a_fMode)) == S_IFDIR )
47	#endif
48
49
50	/**
51	* Calculates the line number for a file position.
52	*
53	* @returns Line number.
54	* @param pcszContent The file content.
55	* @param pcszPos The current position.
56	*/
57	static unsigned long lineNumber(const char pcszContent, const char pcszPos)
58	{
59	unsigned long cLine = 0;
60	while ( *pcszContent
61	&& (uintptr_t)pcszContent < (uintptr_t)pcszPos)
62	{
63	pcszContent = strchr(pcszContent, '\n');
64	if (!pcszContent)
65	break;
66	++cLine;
67	++pcszContent;
68	}
69
70	return cLine;
71	}
72
73
74	/**
75	* Writes an error message.
76	*
77	* @returns RTEXITCODE_FAILURE.
78	* @param pcszFormat Error message.
79	* @param ... Format argument referenced in the message.
80	*/
81	static int printErr(const char *pcszFormat, ...)
82	{
83	va_list va;
84
85	fprintf(stderr, "filesplitter: ");
86	va_start(va, pcszFormat);
87	vfprintf(stderr, pcszFormat, va);
88	va_end(va);
89
90	return RTEXITCODE_FAILURE;
91	}
92
93
94	/**
95	* Opens the makefile list for writing.
96	*
97	* @returns Exit code.
98	* @param pcszPath The path to the file.
99	* @param pcszVariableName The make variable name.
100	* @param ppFile Where to return the file stream.
101	*/
102	static int openMakefileList(const char pcszPath, const char pcszVariableName, FILE **ppFile)
103	{
104	*ppFile = NULL;
105
106	FILE *pFile= fopen(pcszPath, "w");
107	if (!pFile)
108	#ifdef _MSC_VER
109	return printErr("Failed to open \"%s\" for writing the file list: %s (win32: %d)\n",
110	pcszPath, strerror(errno), _doserrno);
111	#else
112	return printErr("Failed to open \"%s\" for writing the file list: %s\n", pcszPath, strerror(errno));
113	#endif
114
115	if (fprintf(pFile, "%s := \\\n", pcszVariableName) <= 0)
116	{
117	fclose(pFile);
118	return printErr("Error writing to the makefile list.\n");
119	}
120
121	*ppFile = pFile;
122	return 0;
123	}
124
125
126	/**
127	* Adds the given file to the makefile list.
128	*
129	* @returns Exit code.
130	* @param pFile The file stream of the makefile list.
131	* @param pszFilename The file name to add.
132	*/
133	static int addFileToMakefileList(FILE pFile, char pszFilename)
134	{
135	if (pFile)
136	{
137	char *pszSlash = pszFilename;
138	while ((pszSlash = strchr(pszSlash, '\\')) != NULL)
139	*pszSlash++ = '/';
140
141	if (fprintf(pFile, "\t%s \\\n", pszFilename) <= 0)
142	return printErr("Error adding file to makefile list.\n");
143	}
144	return 0;
145	}
146
147
148	/**
149	* Closes the makefile list.
150	*
151	* @returns Exit code derived from @a rc.
152	* @param pFile The file stream of the makefile list.
153	* @param rc The current exit code.
154	*/
155	static int closeMakefileList(FILE *pFile, int rc)
156	{
157	fprintf(pFile, "\n\n");
158	if (fclose(pFile))
159	return printErr("Error closing the file list file: %s\n", strerror(errno));
160	return rc;
161	}
162
163
164	/**
165	* Reads in a file.
166	*
167	* @returns Exit code.
168	* @param pcszFile The path to the file.
169	* @param ppszFile Where to return the buffer.
170	* @param pcchFile Where to return the file size.
171	*/
172	static int readFile(const char pcszFile, char ppszFile, size_t pcchFile)
173	{
174	FILE *pFile;
175	struct stat FileStat;
176	int rc;
177
178	if (stat(pcszFile, &FileStat))
179	return printErr("Failed to stat \"%s\": %s\n", pcszFile, strerror(errno));
180
181	pFile = fopen(pcszFile, "r");
182	if (!pFile)
183	return printErr("Failed to open \"%s\": %s\n", pcszFile, strerror(errno));
184
185	ppszFile = (char )malloc(FileStat.st_size + 1);
186	if (*ppszFile)
187	{
188	errno = 0;
189	size_t cbRead = fread(*ppszFile, 1, FileStat.st_size, pFile);
190	if ( cbRead <= (size_t)FileStat.st_size
191	&& (cbRead > 0 \|\| !ferror(pFile)) )
192	{
193	if (ftell(pFile) == FileStat.st_size) /* (\r\n vs \n in the DOS world) */
194	{
195	(*ppszFile)[cbRead] = '\0';
196	if (pcchFile)
197	*pcchFile = (size_t)cbRead;
198
199	fclose(pFile);
200	return 0;
201	}
202	}
203
204	rc = printErr("Error reading \"%s\": %s\n", pcszFile, strerror(errno));
205	free(*ppszFile);
206	*ppszFile = NULL;
207	}
208	else
209	rc = printErr("Failed to allocate %lu bytes\n", (unsigned long)(FileStat.st_size + 1));
210	fclose(pFile);
211	return rc;
212	}
213
214
215	/**
216	* Checks whether the sub-file already exists and has the exact
217	* same content.
218	*
219	* @returns @c true if the existing file matches exactly, otherwise @c false.
220	* @param pcszFilename The path to the file.
221	* @param pcszSubContent The content to write.
222	* @param cchSubContent The length of the content.
223	*/
224	static bool compareSubFile(const char pcszFilename, const char pcszSubContent, size_t cchSubContent)
225	{
226	struct stat FileStat;
227	if (stat(pcszFilename, &FileStat))
228	return false;
229	if ((size_t)FileStat.st_size < cchSubContent)
230	return false;
231
232	size_t cchExisting;
233	char *pszExisting;
234	int rc = readFile(pcszFilename, &pszExisting, &cchExisting);
235	if (rc)
236	return false;
237
238	bool fRc = cchExisting == cchSubContent
239	&& !memcmp(pcszSubContent, pszExisting, cchSubContent);
240	free(pszExisting);
241
242	return fRc;
243	}
244
245
246	/**
247	* Writes out a sub-file.
248	*
249	* @returns exit code.
250	* @param pcszFilename The path to the sub-file.
251	* @param pcszSubContent The content of the file.
252	* @param cchSubContent The size of the content.
253	*/
254	static int writeSubFile(const char pcszFilename, const char pcszSubContent, size_t cchSubContent)
255	{
256	FILE *pFile = fopen(pcszFilename, "w");
257	if (!pFile)
258	#ifdef _MSC_VER
259	return printErr("Failed to open \"%s\" for writing: %s (win32: %d)\n", pcszFilename, strerror(errno), _doserrno);
260	#else
261	return printErr("Failed to open \"%s\" for writing: %s\n", pcszFilename, strerror(errno));
262	#endif
263
264	errno = 0;
265	int rc = 0;
266	if (fwrite(pcszSubContent, cchSubContent, 1, pFile) != 1)
267	rc = printErr("Error writing \"%s\": %s\n", pcszFilename, strerror(errno));
268
269	errno = 0;
270	int rc2 = fclose(pFile);
271	if (rc2 == EOF)
272	rc = printErr("Error closing \"%s\": %s\n", pcszFilename, strerror(errno));
273	return rc;
274	}
275
276
277	/**
278	* Does the actual file splitting.
279	*
280	* @returns exit code.
281	* @param pcszOutDir Path to the output directory.
282	* @param pcszContent The content to split up.
283	* @param pFileList The file stream of the makefile list. Can be NULL.
284	*/
285	static int splitFile(const char pcszOutDir, const char pcszContent, FILE *pFileList)
286	{
287	static char const s_szBeginMarker[] = "\n// ##### BEGINFILE \"";
288	static char const s_szEndMarker[] = "\n// ##### ENDFILE";
289	const size_t cchBeginMarker = sizeof(s_szBeginMarker) - 1;
290	const char *pcszSearch = pcszContent;
291	size_t const cchOutDir = strlen(pcszOutDir);
292	unsigned long cFilesWritten = 0;
293	unsigned long cFilesUnchanged = 0;
294	int rc = 0;
295
296	do
297	{
298	/* find begin marker */
299	const char *pcszBegin = strstr(pcszSearch, s_szBeginMarker);
300	if (!pcszBegin)
301	break;
302
303	/* find line after begin marker */
304	const char *pcszLineAfterBegin = strchr(pcszBegin + cchBeginMarker, '\n');
305	if (!pcszLineAfterBegin)
306	return printErr("No newline after begin-file marker found.\n");
307	++pcszLineAfterBegin;
308
309	/* find filename end quote in begin marker line */
310	const char *pcszStartFilename = pcszBegin + cchBeginMarker;
311	const char pcszEndQuote = (const char )memchr(pcszStartFilename, '\"', pcszLineAfterBegin - pcszStartFilename);
312	if (!pcszEndQuote)
313	return printErr("Can't parse filename after begin-file marker (line %lu).\n",
314	lineNumber(pcszContent, s_szBeginMarker));
315
316	/* find end marker */
317	const char *pcszEnd = strstr(pcszLineAfterBegin, s_szEndMarker);
318	if (!pcszEnd)
319	return printErr("No matching end-line marker for begin-file marker found (line %lu).\n",
320	lineNumber(pcszContent, s_szBeginMarker));
321
322	/* construct output filename */
323	size_t cchFilename = pcszEndQuote - pcszStartFilename;
324	char pszFilename = (char )malloc(cchOutDir + 1 + cchFilename + 1);
325	if (!pszFilename)
326	return printErr("Can't allocate memory for filename.\n");
327
328	memcpy(pszFilename, pcszOutDir, cchOutDir);
329	pszFilename[cchOutDir] = '/';
330	memcpy(pszFilename + cchOutDir + 1, pcszStartFilename, cchFilename);
331	pszFilename[cchFilename + 1 + cchOutDir] = '\0';
332
333	/* Write the file only if necessary. */
334	if (compareSubFile(pszFilename, pcszLineAfterBegin, pcszEnd - pcszLineAfterBegin))
335	cFilesUnchanged++;
336	else
337	{
338	rc = writeSubFile(pszFilename, pcszLineAfterBegin, pcszEnd - pcszLineAfterBegin);
339	cFilesWritten++;
340	}
341
342	if (!rc)
343	rc = addFileToMakefileList(pFileList, pszFilename);
344
345	free(pszFilename);
346
347	pcszSearch = pcszEnd;
348	} while (rc == 0 && pcszSearch);
349
350	printf("filesplitter: Out of %lu files: %lu rewritten, %lu unchanged. (%s)\n",
351	cFilesWritten + cFilesUnchanged, cFilesWritten, cFilesUnchanged, pcszOutDir);
352	return rc;
353	}
354
355
356	int main(int argc, char *argv[])
357	{
358	int rc = 0;
359
360	if (argc == 3 \|\| argc == 5)
361	{
362	struct stat DirStat;
363	if ( stat(argv[2], &DirStat) == 0
364	&& S_ISDIR(DirStat.st_mode))
365	{
366	char *pszContent;
367	rc = readFile(argv[1], &pszContent, NULL);
368	if (!rc)
369	{
370	FILE *pFileList = NULL;
371	if (argc == 5)
372	rc = openMakefileList(argv[3], argv[4], &pFileList);
373
374	if (argc < 4 \|\| pFileList)
375	rc = splitFile(argv[2], pszContent, pFileList);
376
377	if (pFileList)
378	rc = closeMakefileList(pFileList, rc);
379	free(pszContent);
380	}
381	}
382	else
383	rc = printErr("Given argument \"%s\" is not a valid directory.\n", argv[2]);
384	}
385	else
386	rc = printErr("Syntax error: usage: filesplitter <infile> <outdir> [<list.kmk> <kmkvar>]\n");
387	return rc;
388	}

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source: vbox/trunk/src/bldprogs/filesplitter.cpp@ 100881

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