jscoverage/trunk/util.c

/*
    util.c - general purpose utility routines
    Copyright (C) 2007, 2008, 2009 siliconforks.com

    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.
*/

#define _GNU_SOURCE

#include <config.h>

#include "util.h"

#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <strings.h>

#include <dirent.h>
#include <libgen.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

const char * program = NULL;

void fatal(const char * format, ...) {
  fprintf(stderr, "%s: ", program);
  va_list ap;
  va_start(ap, format);
  vfprintf(stderr, format, ap);
  va_end(ap);
  fputc('\n', stderr);
  exit(EXIT_FAILURE);
}

void fatal_command_line(const char * format, ...) {
  fprintf(stderr, "%s: ", program);
  va_list ap;
  va_start(ap, format);
  vfprintf(stderr, format, ap);
  va_end(ap);
  fputc('\n', stderr);
  fprintf(stderr, "Try `%s --help' for more information.\n", program);
  exit(EXIT_FAILURE);
}

void fatal_source(const char * source_file, unsigned int line_number, const char * format, ...) {
  fprintf(stderr, "%s:%s:%u: ", program, source_file, line_number);
  va_list ap;
  va_start(ap, format);
  vfprintf(stderr, format, ap);
  va_end(ap);
  fputc('\n', stderr);
  exit(EXIT_FAILURE);
}

void warn_source(const char * source_file, unsigned int line_number, const char * format, ...) {
  fprintf(stderr, "%s:%s:%u: ", program, source_file, line_number);
  va_list ap;
  va_start(ap, format);
  vfprintf(stderr, format, ap);
  va_end(ap);
  fputc('\n', stderr);
}

void version(void) {
  printf("%s %s\n", program, VERSION);
  printf("Character encoding support: ");
#if HAVE_ICONV
  printf("iconv\n");
#elif HAVE_MULTIBYTETOWIDECHAR
  printf("MultiByteToWideChar\n");
#else
  printf("none\n");
#endif
  exit(EXIT_SUCCESS);
}

size_t addst(size_t x, size_t y) {
  if (SIZE_MAX - x < y) {
    fatal("integer overflow");
  }
  return x + y;
}

size_t mulst(size_t x, size_t y) {
  if (x == 0 || y == 0) {
    return 0;
  }
  if (SIZE_MAX / x < y) {
    fatal("integer overflow");
  }
  return x * y;
}

void * xmalloc(size_t size) {
  void * result = malloc(size);
  if (result == NULL) {
    fatal("out of memory");
  }
  return result;
}

void * xrealloc(void * p, size_t size) {
  void * result = realloc(p, size);
  if (result == NULL) {
    fatal("out of memory");
  }
  return result;
}

char * xstrdup(const char * s) {
  char * result = strdup(s);
  if (result == NULL) {
    fatal("out of memory");
  }
  return result;
}

char * xstrndup(const char * s, size_t size) {
  char * result = strndup(s, size);
  if (result == NULL) {
    fatal("out of memory");
  }
  return result;
}

int xasprintf(char ** s, const char * template, ...) {
  va_list a;
  va_start(a, template);
  int result = vasprintf(s, template, a);
  va_end(a);
  if (result < 0) {
    fatal("out of memory");
  }
  return result;
}

char * xgetcwd(void) {
  char * result = getcwd(NULL, 0);
  if (result == NULL) {
    fatal("out of memory");
  }
  return result;
}

FILE * xfopen(const char * file, const char * mode) {
  FILE * result = fopen(file, mode);
  if (result == NULL) {
    fatal("cannot open file: %s", file);
  }
  return result;
}

DIR * xopendir(const char * directory) {
  DIR * result = opendir(directory);
  if (result == NULL) {
    fatal("cannot open directory: %s", directory);
  }
  return result;
}

void xlstat(const char * file, struct stat * buf) {
#ifdef _WIN32
  return xstat(file, buf);
#else
  if (lstat(file, buf) == -1) {
    fatal("cannot stat file: %s", file);
  }
#endif
}

void xstat(const char * file, struct stat * buf) {
  if (stat(file, buf) == -1) {
    fatal("cannot stat file: %s", file);
  }
}

void xmkdir(const char * directory) {
  int result;
#ifdef _WIN32
  result = mkdir(directory);
#else
  result = mkdir(directory, 0755);
#endif
  if (result == -1) {
    fatal("cannot create directory: %s", directory);
  }
}

void mkdir_if_necessary(const char * directory) {
  struct stat buf;
  if (stat(directory, &buf) == 0) {
    if (! S_ISDIR(buf.st_mode)) {
      fatal("not a directory: %s", directory);
    }
  }
  else {
    if (errno == ENOENT) {
      xmkdir(directory);
    }
    else {
      fatal("cannot stat directory: %s", directory);
    }
  }
}

void mkdirs(const char * directory) {
  char * d = xmalloc(strlen(directory) + 1);
  for (const char * p = directory; *p != '\0'; p++) {
    if (*p == '/' && p > directory) {
      strncpy(d, directory, p - directory);
      d[p - directory] = '\0';
      mkdir_if_necessary(d);
    }
  }
  mkdir_if_necessary(directory);
  free(d);
}

void xchdir(const char * directory) {
  if (chdir(directory) == -1) {
    fatal("cannot change directory: %s", directory);
  }
}

bool str_starts_with(const char * string, const char * prefix) {
  const char * string_ptr = string;
  const char * prefix_ptr = prefix;
  while (*string_ptr != '\0' && *prefix_ptr != '\0') {
    if (*string_ptr != *prefix_ptr) {
      return false;
    }
    string_ptr++;
    prefix_ptr++;
  }
  if (*string_ptr == '\0' && *prefix_ptr != '\0') {
    return false;
  }
  return true;
}

bool str_ends_with(const char * string, const char * suffix) {
  size_t string_length = strlen(string);
  size_t suffix_length = strlen(suffix);
  if (string_length < suffix_length) {
    return false;
  }
  return strcmp(string + string_length - suffix_length, suffix) == 0;
}

char * make_path(const char * parent, const char * relative_path) {
  size_t parent_length = strlen(parent);
  size_t relative_path_length = strlen(relative_path);
  size_t result_length = addst(parent_length, relative_path_length);
  result_length = addst(result_length, 2);
  char * result = xmalloc(result_length);
  strcpy(result, parent);
  result[parent_length] = '/';
  strcpy(result + parent_length + 1, relative_path);
  return result;
}

char * make_canonical_path(const char * relative_path) {
  char * original_directory = xgetcwd();
  char * base = make_basename(relative_path);
  char * dir = make_dirname(relative_path);

  xchdir(dir);
  char * canonical_dir = xgetcwd();
  char * result = make_path(canonical_dir, base);

  free(canonical_dir);
  free(base);
  free(dir);
  xchdir(original_directory);
  free(original_directory);

  return result;
}

char * make_basename(const char * path) {
  char * copy = xstrdup(path);
  char * result = xstrdup(basename(copy));
  free(copy);
  return result;
}

char * make_dirname(const char * path) {
  char * copy = xstrdup(path);
  char * result = xstrdup(dirname(copy));
  free(copy);
  return result;
}

int is_same_file(const char * file1, const char * file2) {
#ifdef _WIN32
#define FILECMP strcasecmp
#else
#define FILECMP strcmp
#endif
  if (FILECMP(file1, file2) == 0) {
    return 1;
  }

  char * canonical1 = make_canonical_path(file1);
  char * canonical2 = make_canonical_path(file2);
  int cmp = FILECMP(canonical1, canonical2);
  free(canonical1);
  free(canonical2);
  if (cmp == 0) {
    return 1;
  }

#ifndef _WIN32
  struct stat buf1;
  if (stat(file1, &buf1) == -1) {
    if (errno == ENOENT) {
      return 0;
    }
    else {
      fatal("cannot stat file: %s", file1);
    }
  }
  struct stat buf2;
  if (stat(file2, &buf2) == -1) {
    if (errno == ENOENT) {
      return 0;
    }
    else {
      fatal("cannot stat file: %s", file2);
    }
  }
  if (buf1.st_dev == buf2.st_dev &&
      buf1.st_ino == buf2.st_ino) {
    return 1;
  }
#endif
  return 0;
#undef FILECMP
}

int contains_file(const char * file1, const char * file2) {
  int result = 0;
  char * ancestor = make_canonical_path(file1);
  char * d = make_canonical_path(file2);
  char * parent = make_dirname(d);
  while (strcmp(d, parent) != 0) {
    if (is_same_file(ancestor, parent)) {
      result = 1;
      break;
    }
    free(d);
    d = parent;
    parent = make_dirname(d);
  }
  free(d);
  free(parent);
  free(ancestor);
  return result;
}

void copy_stream(FILE * source, FILE * destination) {
  unsigned char buffer[8192];
  for (;;) {
    int bytes_read = fread(buffer, 1, sizeof(buffer), source);
    if (bytes_read == 0) {
      break;
    }
    fwrite(buffer, 1, bytes_read, destination);
  }
}

void copy_file(const char * source_file, const char * destination_file) {
  FILE * source = xfopen(source_file, "rb");
  FILE * destination = xfopen(destination_file, "wb");

  copy_stream(source, destination);

#ifndef _WIN32
  /* copy permissions */
  struct stat buf;
  if (fstat(fileno(source), &buf) == -1) {
    fatal("cannot stat file: %s", source_file);
  }
  fchmod(fileno(destination), buf.st_mode);
#endif

  fclose(source);
  fclose(destination);
}

bool directory_is_empty(const char * directory) {
  bool result = true;
  DIR * dir = xopendir(directory);
  struct dirent * e;
  while ((e = readdir(dir)) != NULL) {
    if (strcmp(e->d_name, ".") != 0 &&
        strcmp(e->d_name, "..") != 0) {
      result = false;
      break;
    }
  }
  closedir(dir);
  return result;
}

static struct DirListEntry * recursive_dir_list(const char * root, const char * directory_wrt_root, struct DirListEntry * head) {
  char * directory = directory_wrt_root == NULL? xstrdup(root): make_path(root, directory_wrt_root);
  DIR * dir = xopendir(directory);
  struct dirent * e;
  while ((e = readdir(dir)) != NULL) {
    if (strcmp(e->d_name, ".") == 0 ||
        strcmp(e->d_name, "..") == 0) {
      continue;
    }
    char * entry = make_path(directory, e->d_name);
    char * entry_wrt_root = directory_wrt_root == NULL? xstrdup(e->d_name): make_path(directory_wrt_root, e->d_name);
    struct stat buf;
    xlstat(entry, &buf);
    if (S_ISREG(buf.st_mode)) {
      struct DirListEntry * p = xmalloc(sizeof(struct DirListEntry));
      p->name = entry_wrt_root;
      p->next = head;
      head = p;
    }
    else if (S_ISDIR(buf.st_mode)) {
      head = recursive_dir_list(root, entry_wrt_root, head);
      free(entry_wrt_root);
    }
#ifndef _WIN32
    else if (S_ISLNK(buf.st_mode)) {
      /* check what it points to */
      xstat(entry, &buf);
      if (S_ISREG(buf.st_mode)) {
        struct DirListEntry * p = xmalloc(sizeof(struct DirListEntry));
        p->name = entry_wrt_root;
        p->next = head;
        head = p;
      }
      else {
        fatal("refusing to follow symbolic link: %s", entry);
      }
    }
#endif
    else {
      fatal("unknown file type: %s", entry);
    }
    free(entry);
  }
  closedir(dir);
  free(directory);
  return head;
}

struct DirListEntry * make_recursive_dir_list(const char * directory) {
  return recursive_dir_list(directory, NULL, NULL);
}

void free_dir_list(struct DirListEntry * list) {
  while (list != NULL) {
    struct DirListEntry * next = list->next;
    free(list->name);
    free(list);
    list = next;
  }
}

#ifndef HAVE_STRNDUP
char * strndup(const char * s, size_t size) {
  size_t length = strlen(s);
  if (length > size) {
    char * result = xmalloc(size + 1);
    strncpy(result, s, size);
    result[size] = '\0';
    return result;
  }
  else {
    char * result = xmalloc(length + 1);
    strcpy(result, s);
    return result;
  }
}
#endif

#ifndef HAVE_VASPRINTF
int vasprintf(char ** s, const char * template, va_list a) {
  int size = 100;
  *s = malloc(size);
  if (*s == NULL) {
    return -1;
  }

  va_list copy;
  va_copy(copy, a);
  int result = vsnprintf(*s, size, template, copy);
  if (result >= size) {
    int new_size = result;
    if (new_size == INT_MAX) {
      free(*s);
      return -1;
    }
    new_size++;
    char * new_s = realloc(*s, new_size);
    if (new_s == NULL) {
      free(*s);
      return -1;
    }
    *s = new_s;
    size = new_size;
    va_copy(copy, a);
    result = vsnprintf(*s, size, template, copy);
    assert(result == size - 1);
  }
  else if (result == -1) {
    while (result == -1) {
      if (size == INT_MAX) {
        free(*s);
        return -1;
      }
      int new_size;
      if (size > INT_MAX / 2) {
        new_size = INT_MAX;
      }
      else {
        new_size = 2 * size;
      }
      char * new_s = realloc(*s, new_size);
      if (new_s == NULL) {
        free(*s);
        return -1;
      }
      *s = new_s;
      size = new_size;
      va_copy(copy, a);
      result = vsnprintf(*s, size, template, copy);
    }
    assert(result <= size - 1);
  }

  return result;
}
#endif

#ifndef HAVE_ASPRINTF
int asprintf(char ** s, const char * template, ...) {
  va_list a;
  va_start(a, template);
  int result = vasprintf(s, template, a);
  va_end(a);
  return result;
}
#endif
1	siliconforks	2	/*
2			util.c - general purpose utility routines
3	siliconforks	427	Copyright (C) 2007, 2008, 2009 siliconforks.com
4	siliconforks	2
5			This program is free software; you can redistribute it and/or modify
6			it under the terms of the GNU General Public License as published by
7			the Free Software Foundation; either version 2 of the License, or
8			(at your option) any later version.
9
10			This program is distributed in the hope that it will be useful,
11			but WITHOUT ANY WARRANTY; without even the implied warranty of
12			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13			GNU General Public License for more details.
14
15			You should have received a copy of the GNU General Public License along
16			with this program; if not, write to the Free Software Foundation, Inc.,
17			51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18			*/
19
20	siliconforks	106	#define _GNU_SOURCE
21
22			#include <config.h>
23
24	siliconforks	2	#include "util.h"
25
26			#include <assert.h>
27			#include <errno.h>
28	siliconforks	99	#include <limits.h>
29	siliconforks	2	#include <stdarg.h>
30			#include <stdio.h>
31	siliconforks	106	#include <stdint.h>
32	siliconforks	2	#include <string.h>
33			#include <strings.h>
34
35			#include <dirent.h>
36			#include <libgen.h>
37			#include <sys/stat.h>
38			#include <sys/types.h>
39			#include <unistd.h>
40
41			const char * program = NULL;
42
43			void fatal(const char * format, ...) {
44			fprintf(stderr, "%s: ", program);
45			va_list ap;
46			va_start(ap, format);
47			vfprintf(stderr, format, ap);
48			va_end(ap);
49			fputc('\n', stderr);
50	siliconforks	191	exit(EXIT_FAILURE);
51			}
52
53			void fatal_command_line(const char * format, ...) {
54			fprintf(stderr, "%s: ", program);
55			va_list ap;
56			va_start(ap, format);
57			vfprintf(stderr, format, ap);
58			va_end(ap);
59			fputc('\n', stderr);
60	siliconforks	2	fprintf(stderr, "Try `%s --help' for more information.\n", program);
61			exit(EXIT_FAILURE);
62			}
63
64	siliconforks	370	void fatal_source(const char * source_file, unsigned int line_number, const char * format, ...) {
65			fprintf(stderr, "%s:%s:%u: ", program, source_file, line_number);
66			va_list ap;
67			va_start(ap, format);
68			vfprintf(stderr, format, ap);
69			va_end(ap);
70			fputc('\n', stderr);
71			exit(EXIT_FAILURE);
72			}
73
74	siliconforks	372	void warn_source(const char * source_file, unsigned int line_number, const char * format, ...) {
75			fprintf(stderr, "%s:%s:%u: ", program, source_file, line_number);
76			va_list ap;
77			va_start(ap, format);
78			vfprintf(stderr, format, ap);
79			va_end(ap);
80			fputc('\n', stderr);
81			}
82
83	siliconforks	311	void version(void) {
84			printf("%s %s\n", program, VERSION);
85			printf("Character encoding support: ");
86			#if HAVE_ICONV
87			printf("iconv\n");
88			#elif HAVE_MULTIBYTETOWIDECHAR
89			printf("MultiByteToWideChar\n");
90			#else
91			printf("none\n");
92			#endif
93			exit(EXIT_SUCCESS);
94			}
95
96	siliconforks	106	size_t addst(size_t x, size_t y) {
97			if (SIZE_MAX - x < y) {
98			fatal("integer overflow");
99			}
100			return x + y;
101			}
102
103			size_t mulst(size_t x, size_t y) {
104			if (x == 0 \|\| y == 0) {
105			return 0;
106			}
107			if (SIZE_MAX / x < y) {
108			fatal("integer overflow");
109			}
110			return x * y;
111			}
112
113	siliconforks	2	void * xmalloc(size_t size) {
114			void * result = malloc(size);
115			if (result == NULL) {
116			fatal("out of memory");
117			}
118			return result;
119			}
120
121	siliconforks	91	void * xrealloc(void * p, size_t size) {
122			void * result = realloc(p, size);
123			if (result == NULL) {
124			fatal("out of memory");
125			}
126			return result;
127			}
128
129	siliconforks	2	char * xstrdup(const char * s) {
130			char * result = strdup(s);
131			if (result == NULL) {
132			fatal("out of memory");
133			}
134			return result;
135			}
136
137	siliconforks	106	char * xstrndup(const char * s, size_t size) {
138			char * result = strndup(s, size);
139			if (result == NULL) {
140			fatal("out of memory");
141			}
142			return result;
143			}
144
145			int xasprintf(char ** s, const char * template, ...) {
146			va_list a;
147			va_start(a, template);
148			int result = vasprintf(s, template, a);
149			va_end(a);
150			if (result < 0) {
151			fatal("out of memory");
152			}
153			return result;
154			}
155
156	siliconforks	2	char * xgetcwd(void) {
157			char * result = getcwd(NULL, 0);
158			if (result == NULL) {
159			fatal("out of memory");
160			}
161			return result;
162			}
163
164			FILE * xfopen(const char * file, const char * mode) {
165			FILE * result = fopen(file, mode);
166			if (result == NULL) {
167			fatal("cannot open file: %s", file);
168			}
169			return result;
170			}
171
172			DIR * xopendir(const char * directory) {
173			DIR * result = opendir(directory);
174			if (result == NULL) {
175			fatal("cannot open directory: %s", directory);
176			}
177			return result;
178			}
179
180			void xlstat(const char * file, struct stat * buf) {
181			#ifdef _WIN32
182			return xstat(file, buf);
183			#else
184			if (lstat(file, buf) == -1) {
185			fatal("cannot stat file: %s", file);
186			}
187			#endif
188			}
189
190			void xstat(const char * file, struct stat * buf) {
191			if (stat(file, buf) == -1) {
192			fatal("cannot stat file: %s", file);
193			}
194			}
195
196			void xmkdir(const char * directory) {
197			int result;
198			#ifdef _WIN32
199			result = mkdir(directory);
200			#else
201			result = mkdir(directory, 0755);
202			#endif
203			if (result == -1) {
204			fatal("cannot create directory: %s", directory);
205			}
206			}
207
208			void mkdir_if_necessary(const char * directory) {
209			struct stat buf;
210			if (stat(directory, &buf) == 0) {
211			if (! S_ISDIR(buf.st_mode)) {
212			fatal("not a directory: %s", directory);
213			}
214			}
215			else {
216			if (errno == ENOENT) {
217			xmkdir(directory);
218			}
219			else {
220			fatal("cannot stat directory: %s", directory);
221			}
222			}
223			}
224
225			void mkdirs(const char * directory) {
226			char * d = xmalloc(strlen(directory) + 1);
227			for (const char * p = directory; *p != '\0'; p++) {
228			if (*p == '/' && p > directory) {
229			strncpy(d, directory, p - directory);
230			d[p - directory] = '\0';
231			mkdir_if_necessary(d);
232			}
233			}
234			mkdir_if_necessary(directory);
235			free(d);
236			}
237
238			void xchdir(const char * directory) {
239			if (chdir(directory) == -1) {
240			fatal("cannot change directory: %s", directory);
241			}
242			}
243
244	siliconforks	106	bool str_starts_with(const char * string, const char * prefix) {
245			const char * string_ptr = string;
246			const char * prefix_ptr = prefix;
247			while (string_ptr != '\0' && prefix_ptr != '\0') {
248			if (string_ptr != prefix_ptr) {
249			return false;
250			}
251			string_ptr++;
252			prefix_ptr++;
253			}
254			if (string_ptr == '\0' && prefix_ptr != '\0') {
255			return false;
256			}
257			return true;
258			}
259
260			bool str_ends_with(const char * string, const char * suffix) {
261			size_t string_length = strlen(string);
262			size_t suffix_length = strlen(suffix);
263			if (string_length < suffix_length) {
264			return false;
265			}
266			return strcmp(string + string_length - suffix_length, suffix) == 0;
267			}
268
269	siliconforks	2	char * make_path(const char * parent, const char * relative_path) {
270			size_t parent_length = strlen(parent);
271			size_t relative_path_length = strlen(relative_path);
272	siliconforks	106	size_t result_length = addst(parent_length, relative_path_length);
273			result_length = addst(result_length, 2);
274			char * result = xmalloc(result_length);
275	siliconforks	2	strcpy(result, parent);
276			result[parent_length] = '/';
277			strcpy(result + parent_length + 1, relative_path);
278			return result;
279			}
280
281			char * make_canonical_path(const char * relative_path) {
282			char * original_directory = xgetcwd();
283			char * base = make_basename(relative_path);
284			char * dir = make_dirname(relative_path);
285
286			xchdir(dir);
287			char * canonical_dir = xgetcwd();
288			char * result = make_path(canonical_dir, base);
289
290			free(canonical_dir);
291			free(base);
292			free(dir);
293			xchdir(original_directory);
294			free(original_directory);
295
296			return result;
297			}
298
299			char * make_basename(const char * path) {
300			char * copy = xstrdup(path);
301			char * result = xstrdup(basename(copy));
302			free(copy);
303			return result;
304			}
305
306			char * make_dirname(const char * path) {
307			char * copy = xstrdup(path);
308			char * result = xstrdup(dirname(copy));
309			free(copy);
310			return result;
311			}
312
313			int is_same_file(const char * file1, const char * file2) {
314			#ifdef _WIN32
315			#define FILECMP strcasecmp
316			#else
317			#define FILECMP strcmp
318			#endif
319			if (FILECMP(file1, file2) == 0) {
320			return 1;
321			}
322
323			char * canonical1 = make_canonical_path(file1);
324			char * canonical2 = make_canonical_path(file2);
325			int cmp = FILECMP(canonical1, canonical2);
326			free(canonical1);
327			free(canonical2);
328			if (cmp == 0) {
329			return 1;
330			}
331
332			#ifndef _WIN32
333			struct stat buf1;
334			if (stat(file1, &buf1) == -1) {
335			if (errno == ENOENT) {
336			return 0;
337			}
338			else {
339			fatal("cannot stat file: %s", file1);
340			}
341			}
342			struct stat buf2;
343			if (stat(file2, &buf2) == -1) {
344			if (errno == ENOENT) {
345			return 0;
346			}
347			else {
348			fatal("cannot stat file: %s", file2);
349			}
350			}
351			if (buf1.st_dev == buf2.st_dev &&
352			buf1.st_ino == buf2.st_ino) {
353			return 1;
354			}
355			#endif
356			return 0;
357			#undef FILECMP
358			}
359
360			int contains_file(const char * file1, const char * file2) {
361			int result = 0;
362			char * ancestor = make_canonical_path(file1);
363			char * d = make_canonical_path(file2);
364			char * parent = make_dirname(d);
365			while (strcmp(d, parent) != 0) {
366			if (is_same_file(ancestor, parent)) {
367			result = 1;
368			break;
369			}
370			free(d);
371			d = parent;
372			parent = make_dirname(d);
373			}
374			free(d);
375			free(parent);
376			free(ancestor);
377			return result;
378			}
379
380			void copy_stream(FILE * source, FILE * destination) {
381			unsigned char buffer[8192];
382			for (;;) {
383			int bytes_read = fread(buffer, 1, sizeof(buffer), source);
384			if (bytes_read == 0) {
385			break;
386			}
387			fwrite(buffer, 1, bytes_read, destination);
388			}
389			}
390
391			void copy_file(const char * source_file, const char * destination_file) {
392			FILE * source = xfopen(source_file, "rb");
393			FILE * destination = xfopen(destination_file, "wb");
394
395			copy_stream(source, destination);
396
397	siliconforks	359	#ifndef _WIN32
398			/* copy permissions */
399			struct stat buf;
400			if (fstat(fileno(source), &buf) == -1) {
401			fatal("cannot stat file: %s", source_file);
402			}
403			fchmod(fileno(destination), buf.st_mode);
404			#endif
405
406	siliconforks	2	fclose(source);
407			fclose(destination);
408			}
409
410	siliconforks	106	bool directory_is_empty(const char * directory) {
411			bool result = true;
412	siliconforks	2	DIR * dir = xopendir(directory);
413			struct dirent * e;
414			while ((e = readdir(dir)) != NULL) {
415			if (strcmp(e->d_name, ".") != 0 &&
416			strcmp(e->d_name, "..") != 0) {
417	siliconforks	106	result = false;
418			break;
419	siliconforks	2	}
420			}
421			closedir(dir);
422	siliconforks	106	return result;
423	siliconforks	2	}
424
425			static struct DirListEntry * recursive_dir_list(const char * root, const char * directory_wrt_root, struct DirListEntry * head) {
426			char * directory = directory_wrt_root == NULL? xstrdup(root): make_path(root, directory_wrt_root);
427			DIR * dir = xopendir(directory);
428			struct dirent * e;
429			while ((e = readdir(dir)) != NULL) {
430			if (strcmp(e->d_name, ".") == 0 \|\|
431			strcmp(e->d_name, "..") == 0) {
432			continue;
433			}
434			char * entry = make_path(directory, e->d_name);
435			char * entry_wrt_root = directory_wrt_root == NULL? xstrdup(e->d_name): make_path(directory_wrt_root, e->d_name);
436			struct stat buf;
437			xlstat(entry, &buf);
438			if (S_ISREG(buf.st_mode)) {
439			struct DirListEntry * p = xmalloc(sizeof(struct DirListEntry));
440			p->name = entry_wrt_root;
441			p->next = head;
442			head = p;
443			}
444			else if (S_ISDIR(buf.st_mode)) {
445			head = recursive_dir_list(root, entry_wrt_root, head);
446			free(entry_wrt_root);
447			}
448	siliconforks	364	#ifndef _WIN32
449	siliconforks	359	else if (S_ISLNK(buf.st_mode)) {
450			/* check what it points to */
451			xstat(entry, &buf);
452			if (S_ISREG(buf.st_mode)) {
453			struct DirListEntry * p = xmalloc(sizeof(struct DirListEntry));
454			p->name = entry_wrt_root;
455			p->next = head;
456			head = p;
457			}
458			else {
459			fatal("refusing to follow symbolic link: %s", entry);
460			}
461			}
462	siliconforks	364	#endif
463	siliconforks	2	else {
464			fatal("unknown file type: %s", entry);
465			}
466			free(entry);
467			}
468			closedir(dir);
469			free(directory);
470			return head;
471			}
472
473			struct DirListEntry * make_recursive_dir_list(const char * directory) {
474			return recursive_dir_list(directory, NULL, NULL);
475			}
476
477			void free_dir_list(struct DirListEntry * list) {
478			while (list != NULL) {
479			struct DirListEntry * next = list->next;
480			free(list->name);
481			free(list);
482			list = next;
483			}
484			}
485	siliconforks	99
486	siliconforks	125	#ifndef HAVE_STRNDUP
487			char * strndup(const char * s, size_t size) {
488			size_t length = strlen(s);
489			if (length > size) {
490			char * result = xmalloc(size + 1);
491			strncpy(result, s, size);
492			result[size] = '\0';
493			return result;
494			}
495			else {
496			char * result = xmalloc(length + 1);
497			strcpy(result, s);
498			return result;
499			}
500	siliconforks	106	}
501			#endif
502
503	siliconforks	99	#ifndef HAVE_VASPRINTF
504			int vasprintf(char ** s, const char * template, va_list a) {
505			int size = 100;
506			*s = malloc(size);
507			if (*s == NULL) {
508			return -1;
509			}
510
511			va_list copy;
512			va_copy(copy, a);
513			int result = vsnprintf(*s, size, template, copy);
514			if (result >= size) {
515			int new_size = result;
516			if (new_size == INT_MAX) {
517			free(*s);
518	siliconforks	106	return -1;
519	siliconforks	99	}
520			new_size++;
521			char * new_s = realloc(*s, new_size);
522			if (new_s == NULL) {
523			free(*s);
524			return -1;
525			}
526			*s = new_s;
527			size = new_size;
528			va_copy(copy, a);
529			result = vsnprintf(*s, size, template, copy);
530			assert(result == size - 1);
531			}
532			else if (result == -1) {
533			while (result == -1) {
534	siliconforks	106	if (size == INT_MAX) {
535	siliconforks	99	free(*s);
536	siliconforks	106	return -1;
537	siliconforks	99	}
538	siliconforks	106	int new_size;
539			if (size > INT_MAX / 2) {
540			new_size = INT_MAX;
541			}
542			else {
543			new_size = 2 * size;
544			}
545	siliconforks	99	char * new_s = realloc(*s, new_size);
546			if (new_s == NULL) {
547			free(*s);
548			return -1;
549			}
550			*s = new_s;
551			size = new_size;
552			va_copy(copy, a);
553			result = vsnprintf(*s, size, template, copy);
554			}
555			assert(result <= size - 1);
556			}
557
558			return result;
559			}
560			#endif
561
562			#ifndef HAVE_ASPRINTF
563			int asprintf(char ** s, const char * template, ...) {
564			va_list a;
565			va_start(a, template);
566			int result = vasprintf(s, template, a);
567			va_end(a);
568			return result;
569			}
570			#endif