summaryrefslogtreecommitdiffstats
path: root/programs/util.h
blob: 394837eadefa4fbbb1d8972652b13cd5852bef8a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
/*
    util.h - utility functions
    Copyright (C) 2016-2020, Przemyslaw Skibinski, Yann Collet

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#ifndef UTIL_H_MODULE
#define UTIL_H_MODULE

#if defined (__cplusplus)
extern "C" {
#endif



/*-****************************************
*  Dependencies
******************************************/
#include "platform.h"     /* PLATFORM_POSIX_VERSION */
#include <stddef.h>       /* size_t, ptrdiff_t */
#include <stdlib.h>       /* malloc */
#include <string.h>       /* strlen, strncpy */
#include <stdio.h>        /* fprintf, fileno */
#include <assert.h>
#include <sys/types.h>    /* stat, utime */
#include <sys/stat.h>     /* stat */
#if defined(_WIN32)
#  include <sys/utime.h>  /* utime */
#  include <io.h>         /* _chmod */
#else
#  include <unistd.h>     /* chown, stat */
# if PLATFORM_POSIX_VERSION < 200809L
#  include <utime.h>      /* utime */
# else
#  include <fcntl.h>      /* AT_FDCWD */
#  include <sys/stat.h>   /* for utimensat */
# endif
#endif
#include <time.h>         /* time */
#include <limits.h>       /* INT_MAX */
#include <errno.h>



/*-**************************************************************
*  Basic Types
*****************************************************************/
#if !defined (__VMS) && (defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */) )
# include <stdint.h>
  typedef  uint8_t BYTE;
  typedef uint16_t U16;
  typedef  int16_t S16;
  typedef uint32_t U32;
  typedef  int32_t S32;
  typedef uint64_t U64;
  typedef  int64_t S64;
#else
  typedef unsigned char       BYTE;
  typedef unsigned short      U16;
  typedef   signed short      S16;
  typedef unsigned int        U32;
  typedef   signed int        S32;
  typedef unsigned long long  U64;
  typedef   signed long long  S64;
#endif


/* ************************************************************
* Avoid fseek()'s 2GiB barrier with MSVC, MacOS, *BSD, MinGW
***************************************************************/
#if defined(_MSC_VER) && (_MSC_VER >= 1400)
#   define UTIL_fseek _fseeki64
#elif !defined(__64BIT__) && (PLATFORM_POSIX_VERSION >= 200112L) /* No point defining Large file for 64 bit */
#  define UTIL_fseek fseeko
#elif defined(__MINGW32__) && defined(__MSVCRT__) && !defined(__STRICT_ANSI__) && !defined(__NO_MINGW_LFS)
#   define UTIL_fseek fseeko64
#else
#   define UTIL_fseek fseek
#endif


/*-****************************************
*  Sleep functions: Windows - Posix - others
******************************************/
#if defined(_WIN32)
#  include <windows.h>
#  define SET_REALTIME_PRIORITY SetPriorityClass(GetCurrentProcess(), REALTIME_PRIORITY_CLASS)
#  define UTIL_sleep(s) Sleep(1000*s)
#  define UTIL_sleepMilli(milli) Sleep(milli)
#elif PLATFORM_POSIX_VERSION >= 0 /* Unix-like operating system */
#  include <unistd.h>
#  include <sys/resource.h> /* setpriority */
#  include <time.h>         /* clock_t, nanosleep, clock, CLOCKS_PER_SEC */
#  if defined(PRIO_PROCESS)
#    define SET_REALTIME_PRIORITY setpriority(PRIO_PROCESS, 0, -20)
#  else
#    define SET_REALTIME_PRIORITY /* disabled */
#  endif
#  define UTIL_sleep(s) sleep(s)
#  if (defined(__linux__) && (PLATFORM_POSIX_VERSION >= 199309L)) || (PLATFORM_POSIX_VERSION >= 200112L)  /* nanosleep requires POSIX.1-2001 */
#      define UTIL_sleepMilli(milli) { struct timespec t; t.tv_sec=0; t.tv_nsec=milli*1000000ULL; nanosleep(&t, NULL); }
#  else
#      define UTIL_sleepMilli(milli) /* disabled */
#  endif
#else
#  define SET_REALTIME_PRIORITY      /* disabled */
#  define UTIL_sleep(s)          /* disabled */
#  define UTIL_sleepMilli(milli) /* disabled */
#endif


/*-****************************************
*  stat() functions
******************************************/
#if defined(_MSC_VER)
#  define UTIL_TYPE_stat __stat64
#  define UTIL_stat _stat64
#  define UTIL_fstat _fstat64
#  define UTIL_STAT_MODE_ISREG(st_mode) ((st_mode) & S_IFREG)
#elif   defined(__MINGW32__) && defined (__MSVCRT__)
#  define UTIL_TYPE_stat _stati64
#  define UTIL_stat _stati64
#  define UTIL_fstat _fstati64
#  define UTIL_STAT_MODE_ISREG(st_mode) ((st_mode) & S_IFREG)
#else
#  define UTIL_TYPE_stat stat
#  define UTIL_stat stat
#  define UTIL_fstat fstat
#  define UTIL_STAT_MODE_ISREG(st_mode) (S_ISREG(st_mode))
#endif


/*-****************************************
*  fileno() function
******************************************/
#if defined(_MSC_VER)
#  define UTIL_fileno _fileno
#else
#  define UTIL_fileno fileno
#endif

/* *************************************
*  Constants
***************************************/
#define LIST_SIZE_INCREASE   (8*1024)


/*-****************************************
*  Compiler specifics
******************************************/
#if defined(__INTEL_COMPILER)
#  pragma warning(disable : 177)    /* disable: message #177: function was declared but never referenced, useful with UTIL_STATIC */
#endif
#if defined(__GNUC__)
#  define UTIL_STATIC static __attribute__((unused))
#elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
#  define UTIL_STATIC static inline
#elif defined(_MSC_VER)
#  define UTIL_STATIC static __inline
#else
#  define UTIL_STATIC static  /* this version may generate warnings for unused static functions; disable the relevant warning */
#endif


/*-****************************************
*  Time functions
******************************************/
#if defined(_WIN32)   /* Windows */

    typedef LARGE_INTEGER UTIL_time_t;
    UTIL_STATIC UTIL_time_t UTIL_getTime(void) { UTIL_time_t x; QueryPerformanceCounter(&x); return x; }
    UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd)
    {
        static LARGE_INTEGER ticksPerSecond;
        static int init = 0;
        if (!init) {
            if (!QueryPerformanceFrequency(&ticksPerSecond))
                fprintf(stderr, "ERROR: QueryPerformanceFrequency() failure\n");
            init = 1;
        }
        return 1000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart;
    }
    UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
    {
        static LARGE_INTEGER ticksPerSecond;
        static int init = 0;
        if (!init) {
            if (!QueryPerformanceFrequency(&ticksPerSecond))
                fprintf(stderr, "ERROR: QueryPerformanceFrequency() failure\n");
            init = 1;
        }
        return 1000000000ULL*(clockEnd.QuadPart - clockStart.QuadPart)/ticksPerSecond.QuadPart;
    }

#elif defined(__APPLE__) && defined(__MACH__)

    #include <mach/mach_time.h>
    typedef U64 UTIL_time_t;
    UTIL_STATIC UTIL_time_t UTIL_getTime(void) { return mach_absolute_time(); }
    UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd)
    {
        static mach_timebase_info_data_t rate;
        static int init = 0;
        if (!init) {
            mach_timebase_info(&rate);
            init = 1;
        }
        return (((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom)) / 1000ULL;
    }
    UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd)
    {
        static mach_timebase_info_data_t rate;
        static int init = 0;
        if (!init) {
            mach_timebase_info(&rate);
            init = 1;
        }
        return ((clockEnd - clockStart) * (U64)rate.numer) / ((U64)rate.denom);
    }

#elif (PLATFORM_POSIX_VERSION >= 200112L) && (defined __UCLIBC__ || (defined(__GLIBC__) && ((__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17) || __GLIBC__ > 2) ) )

    #include <time.h>
    typedef struct timespec UTIL_time_t;
    UTIL_STATIC UTIL_time_t UTIL_getTime(void)
    {
        UTIL_time_t now;
        if (clock_gettime(CLOCK_MONOTONIC, &now))
            fprintf(stderr, "ERROR: Failed to get time\n");   /* we could also exit() */
        return now;
    }
    UTIL_STATIC UTIL_time_t UTIL_getSpanTime(UTIL_time_t begin, UTIL_time_t end)
    {
        UTIL_time_t diff;
        if (end.tv_nsec < begin.tv_nsec) {
            diff.tv_sec = (end.tv_sec - 1) - begin.tv_sec;
            diff.tv_nsec = (end.tv_nsec + 1000000000ULL) - begin.tv_nsec;
        } else {
            diff.tv_sec = end.tv_sec - begin.tv_sec;
            diff.tv_nsec = end.tv_nsec - begin.tv_nsec;
        }
        return diff;
    }
    UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t begin, UTIL_time_t end)
    {
        UTIL_time_t const diff = UTIL_getSpanTime(begin, end);
        U64 micro = 0;
        micro += 1000000ULL * diff.tv_sec;
        micro += diff.tv_nsec / 1000ULL;
        return micro;
    }
    UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t begin, UTIL_time_t end)
    {
        UTIL_time_t const diff = UTIL_getSpanTime(begin, end);
        U64 nano = 0;
        nano += 1000000000ULL * diff.tv_sec;
        nano += diff.tv_nsec;
        return nano;
    }

#else   /* relies on standard C (note : clock_t measurements can be wrong when using multi-threading) */

    typedef clock_t UTIL_time_t;
    UTIL_STATIC UTIL_time_t UTIL_getTime(void) { return clock(); }
    UTIL_STATIC U64 UTIL_getSpanTimeMicro(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
    UTIL_STATIC U64 UTIL_getSpanTimeNano(UTIL_time_t clockStart, UTIL_time_t clockEnd) { return 1000000000ULL * (clockEnd - clockStart) / CLOCKS_PER_SEC; }
#endif


/* returns time span in microseconds */
UTIL_STATIC U64 UTIL_clockSpanMicro(UTIL_time_t clockStart)
{
    UTIL_time_t const clockEnd = UTIL_getTime();
    return UTIL_getSpanTimeMicro(clockStart, clockEnd);
}

/* returns time span in nanoseconds */
UTIL_STATIC U64 UTIL_clockSpanNano(UTIL_time_t clockStart)
{
    UTIL_time_t const clockEnd = UTIL_getTime();
    return UTIL_getSpanTimeNano(clockStart, clockEnd);
}

UTIL_STATIC void UTIL_waitForNextTick(void)
{
    UTIL_time_t const clockStart = UTIL_getTime();
    UTIL_time_t clockEnd;
    do {
        clockEnd = UTIL_getTime();
    } while (UTIL_getSpanTimeNano(clockStart, clockEnd) == 0);
}



/*-****************************************
*  File functions
******************************************/
#if defined(_MSC_VER)
    #define chmod _chmod
    typedef struct __stat64 stat_t;
#else
    typedef struct stat stat_t;
#endif


UTIL_STATIC int UTIL_isRegFile(const char* infilename);


UTIL_STATIC int UTIL_setFileStat(const char *filename, stat_t *statbuf)
{
    int res = 0;

    if (!UTIL_isRegFile(filename))
        return -1;

    {
#if defined(_WIN32) || (PLATFORM_POSIX_VERSION < 200809L)
        struct utimbuf timebuf;
        timebuf.actime = time(NULL);
        timebuf.modtime = statbuf->st_mtime;
        res += utime(filename, &timebuf);  /* set access and modification times */
#else
        struct timespec timebuf[2];
        memset(timebuf, 0, sizeof(timebuf));
        timebuf[0].tv_nsec = UTIME_NOW;
        timebuf[1].tv_sec = statbuf->st_mtime;
        res += utimensat(AT_FDCWD, filename, timebuf, 0);  /* set access and modification times */
#endif
    }

#if !defined(_WIN32)
    res += chown(filename, statbuf->st_uid, statbuf->st_gid);  /* Copy ownership */
#endif

    res += chmod(filename, statbuf->st_mode & 07777);  /* Copy file permissions */

    errno = 0;
    return -res; /* number of errors is returned */
}


UTIL_STATIC int UTIL_getFileStat(const char* infilename, stat_t *statbuf)
{
    int r;
#if defined(_MSC_VER)
    r = _stat64(infilename, statbuf);
    if (r || !(statbuf->st_mode & S_IFREG)) return 0;   /* No good... */
#else
    r = stat(infilename, statbuf);
    if (r || !S_ISREG(statbuf->st_mode)) return 0;   /* No good... */
#endif
    return 1;
}


UTIL_STATIC int UTIL_isRegFile(const char* infilename)
{
    stat_t statbuf;
    return UTIL_getFileStat(infilename, &statbuf); /* Only need to know whether it is a regular file */
}


UTIL_STATIC U32 UTIL_isDirectory(const char* infilename)
{
    int r;
    stat_t statbuf;
#if defined(_MSC_VER)
    r = _stat64(infilename, &statbuf);
    if (!r && (statbuf.st_mode & _S_IFDIR)) return 1;
#else
    r = stat(infilename, &statbuf);
    if (!r && S_ISDIR(statbuf.st_mode)) return 1;
#endif
    return 0;
}


UTIL_STATIC U64 UTIL_getOpenFileSize(FILE* file)
{
    int r;
    int fd;
    struct UTIL_TYPE_stat statbuf;

    fd = UTIL_fileno(file);
    if (fd < 0) {
        perror("fileno");
        exit(1);
    }
    r = UTIL_fstat(fd, &statbuf);
    if (r || !UTIL_STAT_MODE_ISREG(statbuf.st_mode)) return 0;   /* No good... */
    return (U64)statbuf.st_size;
}


UTIL_STATIC U64 UTIL_getFileSize(const char* infilename)
{
    int r;
    struct UTIL_TYPE_stat statbuf;

    r = UTIL_stat(infilename, &statbuf);
    if (r || !UTIL_STAT_MODE_ISREG(statbuf.st_mode)) return 0;   /* No good... */
    return (U64)statbuf.st_size;
}


UTIL_STATIC U64 UTIL_getTotalFileSize(const char** fileNamesTable, unsigned nbFiles)
{
    U64 total = 0;
    unsigned n;
    for (n=0; n<nbFiles; n++)
        total += UTIL_getFileSize(fileNamesTable[n]);
    return total;
}


/*
 * A modified version of realloc().
 * If UTIL_realloc() fails the original block is freed.
*/
UTIL_STATIC void* UTIL_realloc(void* ptr, size_t size)
{
    void* const newptr = realloc(ptr, size);
    if (newptr) return newptr;
    free(ptr);
    return NULL;
}


#ifdef _WIN32
#  define UTIL_HAS_CREATEFILELIST

UTIL_STATIC int UTIL_prepareFileList(const char* dirName, char** bufStart, size_t* pos, char** bufEnd)
{
    char* path;
    size_t dirLength, nbFiles = 0;
    WIN32_FIND_DATAA cFile;
    HANDLE hFile;

    dirLength = strlen(dirName);
    path = (char*) malloc(dirLength + 3);
    if (!path) return 0;

    memcpy(path, dirName, dirLength);
    path[dirLength] = '\\';
    path[dirLength+1] = '*';
    path[dirLength+2] = 0;

    hFile=FindFirstFileA(path, &cFile);
    if (hFile == INVALID_HANDLE_VALUE) {
        fprintf(stderr, "Cannot open directory '%s'\n", dirName);
        return 0;
    }
    free(path);

    do {
        size_t pathLength;
        int const fnameLength = (int)strlen(cFile.cFileName);
        path = (char*) malloc(dirLength + fnameLength + 2);
        if (!path) { FindClose(hFile); return 0; }
        memcpy(path, dirName, dirLength);
        path[dirLength] = '\\';
        memcpy(path+dirLength+1, cFile.cFileName, fnameLength);
        pathLength = dirLength+1+fnameLength;
        path[pathLength] = 0;
        if (cFile.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) {
            if (strcmp (cFile.cFileName, "..") == 0 ||
                strcmp (cFile.cFileName, ".") == 0) continue;

            nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd);  /* Recursively call "UTIL_prepareFileList" with the new path. */
            if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
        }
        else if ((cFile.dwFileAttributes & FILE_ATTRIBUTE_NORMAL) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_ARCHIVE) || (cFile.dwFileAttributes & FILE_ATTRIBUTE_COMPRESSED)) {
            if (*bufStart + *pos + pathLength >= *bufEnd) {
                ptrdiff_t newListSize = (*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
                *bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
                *bufEnd = *bufStart + newListSize;
                if (*bufStart == NULL) { free(path); FindClose(hFile); return 0; }
            }
            if (*bufStart + *pos + pathLength < *bufEnd) {
                strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos));
                *pos += pathLength + 1;
                nbFiles++;
            }
        }
        free(path);
    } while (FindNextFileA(hFile, &cFile));

    FindClose(hFile);
    assert(nbFiles < INT_MAX);
    return (int)nbFiles;
}

#elif defined(__linux__) || (PLATFORM_POSIX_VERSION >= 200112L)  /* opendir, readdir require POSIX.1-2001 */
#  define UTIL_HAS_CREATEFILELIST
#  include <dirent.h>       /* opendir, readdir */
#  include <string.h>       /* strerror, memcpy */

UTIL_STATIC int UTIL_prepareFileList(const char* dirName, char** bufStart, size_t* pos, char** bufEnd)
{
    DIR* dir;
    struct dirent * entry;
    size_t dirLength;
    int nbFiles = 0;

    if (!(dir = opendir(dirName))) {
        fprintf(stderr, "Cannot open directory '%s': %s\n", dirName, strerror(errno));
        return 0;
    }

    dirLength = strlen(dirName);
    errno = 0;
    while ((entry = readdir(dir)) != NULL) {
        char* path;
        size_t fnameLength, pathLength;
        if (strcmp (entry->d_name, "..") == 0 ||
            strcmp (entry->d_name, ".") == 0) continue;
        fnameLength = strlen(entry->d_name);
        path = (char*)malloc(dirLength + fnameLength + 2);
        if (!path) { closedir(dir); return 0; }
        memcpy(path, dirName, dirLength);
        path[dirLength] = '/';
        memcpy(path+dirLength+1, entry->d_name, fnameLength);
        pathLength = dirLength+1+fnameLength;
        path[pathLength] = 0;

        if (UTIL_isDirectory(path)) {
            nbFiles += UTIL_prepareFileList(path, bufStart, pos, bufEnd);  /* Recursively call "UTIL_prepareFileList" with the new path. */
            if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
        } else {
            if (*bufStart + *pos + pathLength >= *bufEnd) {
                size_t const newListSize = (size_t)(*bufEnd - *bufStart) + LIST_SIZE_INCREASE;
                *bufStart = (char*)UTIL_realloc(*bufStart, newListSize);
                *bufEnd = *bufStart + newListSize;
                if (*bufStart == NULL) { free(path); closedir(dir); return 0; }
            }
            if (*bufStart + *pos + pathLength < *bufEnd) {
                strncpy(*bufStart + *pos, path, *bufEnd - (*bufStart + *pos));
                *pos += pathLength + 1;
                nbFiles++;
            }
        }
        free(path);
        errno = 0; /* clear errno after UTIL_isDirectory, UTIL_prepareFileList */
    }

    if (errno != 0) {
        fprintf(stderr, "readdir(%s) error: %s\n", dirName, strerror(errno));
        free(*bufStart);
        *bufStart = NULL;
    }
    closedir(dir);
    return nbFiles;
}

#else

UTIL_STATIC int UTIL_prepareFileList(const char* dirName, char** bufStart, size_t* pos, char** bufEnd)
{
    (void)bufStart; (void)bufEnd; (void)pos;
    fprintf(stderr, "Directory %s ignored (compiled without _WIN32 or _POSIX_C_SOURCE)\n", dirName);
    return 0;
}

#endif /* #ifdef _WIN32 */

/*
 * UTIL_createFileList - takes a list of files and directories (params: inputNames, inputNamesNb), scans directories,
 *                       and returns a new list of files (params: return value, allocatedBuffer, allocatedNamesNb).
 * After finishing usage of the list the structures should be freed with UTIL_freeFileList(params: return value, allocatedBuffer)
 * In case of error UTIL_createFileList returns NULL and UTIL_freeFileList should not be called.
 */
UTIL_STATIC const char**
UTIL_createFileList(const char** inputNames, unsigned inputNamesNb,
                    char** allocatedBuffer, unsigned* allocatedNamesNb)
{
    size_t pos;
    unsigned i, nbFiles;
    char* buf = (char*)malloc(LIST_SIZE_INCREASE);
    size_t bufSize = LIST_SIZE_INCREASE;
    const char** fileTable;

    if (!buf) return NULL;

    for (i=0, pos=0, nbFiles=0; i<inputNamesNb; i++) {
        if (!UTIL_isDirectory(inputNames[i])) {
            size_t const len = strlen(inputNames[i]) + 1;  /* include nul char */
            if (pos + len >= bufSize) {
                while (pos + len >= bufSize) bufSize += LIST_SIZE_INCREASE;
                buf = (char*)UTIL_realloc(buf, bufSize);
                if (!buf) return NULL;
            }
            assert(pos + len < bufSize);
            memcpy(buf + pos, inputNames[i], len);
            pos += len;
            nbFiles++;
        } else {
            char* bufend = buf + bufSize;
            nbFiles += (unsigned)UTIL_prepareFileList(inputNames[i], &buf, &pos, &bufend);
            if (buf == NULL) return NULL;
            assert(bufend > buf);
            bufSize = (size_t)(bufend - buf);
    }   }

    if (nbFiles == 0) { free(buf); return NULL; }

    fileTable = (const char**)malloc(((size_t)nbFiles+1) * sizeof(const char*));
    if (!fileTable) { free(buf); return NULL; }

    for (i=0, pos=0; i<nbFiles; i++) {
        fileTable[i] = buf + pos;
        pos += strlen(fileTable[i]) + 1;
    }

    if (pos > bufSize) {
        free(buf);
        free((void*)fileTable);
        return NULL;
    }   /* can this happen ? */

    *allocatedBuffer = buf;
    *allocatedNamesNb = nbFiles;

    return fileTable;
}


UTIL_STATIC void
UTIL_freeFileList(const char** filenameTable, char* allocatedBuffer)
{
    if (allocatedBuffer) free(allocatedBuffer);
    if (filenameTable) free((void*)filenameTable);
}


#if defined (__cplusplus)
}
#endif

#endif /* UTIL_H_MODULE */