jscoverage/trunk/util.c

/*
    util.c - general purpose utility routines
    Copyright (C) 2007, 2008 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);
}

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);

  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);
    }
    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	/*
2	util.c - general purpose utility routines
3	Copyright (C) 2007, 2008 siliconforks.com
4
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	#define _GNU_SOURCE
21
22	#include <config.h>
23
24	#include "util.h"
25
26	#include <assert.h>
27	#include <errno.h>
28	#include <limits.h>
29	#include <stdarg.h>
30	#include <stdio.h>
31	#include <stdint.h>
32	#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	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	fprintf(stderr, "Try `%s --help' for more information.\n", program);
61	exit(EXIT_FAILURE);
62	}
63
64	size_t addst(size_t x, size_t y) {
65	if (SIZE_MAX - x < y) {
66	fatal("integer overflow");
67	}
68	return x + y;
69	}
70
71	size_t mulst(size_t x, size_t y) {
72	if (x == 0 \|\| y == 0) {
73	return 0;
74	}
75	if (SIZE_MAX / x < y) {
76	fatal("integer overflow");
77	}
78	return x * y;
79	}
80
81	void * xmalloc(size_t size) {
82	void * result = malloc(size);
83	if (result == NULL) {
84	fatal("out of memory");
85	}
86	return result;
87	}
88
89	void * xrealloc(void * p, size_t size) {
90	void * result = realloc(p, size);
91	if (result == NULL) {
92	fatal("out of memory");
93	}
94	return result;
95	}
96
97	char * xstrdup(const char * s) {
98	char * result = strdup(s);
99	if (result == NULL) {
100	fatal("out of memory");
101	}
102	return result;
103	}
104
105	char * xstrndup(const char * s, size_t size) {
106	char * result = strndup(s, size);
107	if (result == NULL) {
108	fatal("out of memory");
109	}
110	return result;
111	}
112
113	int xasprintf(char ** s, const char * template, ...) {
114	va_list a;
115	va_start(a, template);
116	int result = vasprintf(s, template, a);
117	va_end(a);
118	if (result < 0) {
119	fatal("out of memory");
120	}
121	return result;
122	}
123
124	char * xgetcwd(void) {
125	char * result = getcwd(NULL, 0);
126	if (result == NULL) {
127	fatal("out of memory");
128	}
129	return result;
130	}
131
132	FILE * xfopen(const char * file, const char * mode) {
133	FILE * result = fopen(file, mode);
134	if (result == NULL) {
135	fatal("cannot open file: %s", file);
136	}
137	return result;
138	}
139
140	DIR * xopendir(const char * directory) {
141	DIR * result = opendir(directory);
142	if (result == NULL) {
143	fatal("cannot open directory: %s", directory);
144	}
145	return result;
146	}
147
148	void xlstat(const char * file, struct stat * buf) {
149	#ifdef _WIN32
150	return xstat(file, buf);
151	#else
152	if (lstat(file, buf) == -1) {
153	fatal("cannot stat file: %s", file);
154	}
155	#endif
156	}
157
158	void xstat(const char * file, struct stat * buf) {
159	if (stat(file, buf) == -1) {
160	fatal("cannot stat file: %s", file);
161	}
162	}
163
164	void xmkdir(const char * directory) {
165	int result;
166	#ifdef _WIN32
167	result = mkdir(directory);
168	#else
169	result = mkdir(directory, 0755);
170	#endif
171	if (result == -1) {
172	fatal("cannot create directory: %s", directory);
173	}
174	}
175
176	void mkdir_if_necessary(const char * directory) {
177	struct stat buf;
178	if (stat(directory, &buf) == 0) {
179	if (! S_ISDIR(buf.st_mode)) {
180	fatal("not a directory: %s", directory);
181	}
182	}
183	else {
184	if (errno == ENOENT) {
185	xmkdir(directory);
186	}
187	else {
188	fatal("cannot stat directory: %s", directory);
189	}
190	}
191	}
192
193	void mkdirs(const char * directory) {
194	char * d = xmalloc(strlen(directory) + 1);
195	for (const char * p = directory; *p != '\0'; p++) {
196	if (*p == '/' && p > directory) {
197	strncpy(d, directory, p - directory);
198	d[p - directory] = '\0';
199	mkdir_if_necessary(d);
200	}
201	}
202	mkdir_if_necessary(directory);
203	free(d);
204	}
205
206	void xchdir(const char * directory) {
207	if (chdir(directory) == -1) {
208	fatal("cannot change directory: %s", directory);
209	}
210	}
211
212	bool str_starts_with(const char * string, const char * prefix) {
213	const char * string_ptr = string;
214	const char * prefix_ptr = prefix;
215	while (string_ptr != '\0' && prefix_ptr != '\0') {
216	if (string_ptr != prefix_ptr) {
217	return false;
218	}
219	string_ptr++;
220	prefix_ptr++;
221	}
222	if (string_ptr == '\0' && prefix_ptr != '\0') {
223	return false;
224	}
225	return true;
226	}
227
228	bool str_ends_with(const char * string, const char * suffix) {
229	size_t string_length = strlen(string);
230	size_t suffix_length = strlen(suffix);
231	if (string_length < suffix_length) {
232	return false;
233	}
234	return strcmp(string + string_length - suffix_length, suffix) == 0;
235	}
236
237	char * make_path(const char * parent, const char * relative_path) {
238	size_t parent_length = strlen(parent);
239	size_t relative_path_length = strlen(relative_path);
240	size_t result_length = addst(parent_length, relative_path_length);
241	result_length = addst(result_length, 2);
242	char * result = xmalloc(result_length);
243	strcpy(result, parent);
244	result[parent_length] = '/';
245	strcpy(result + parent_length + 1, relative_path);
246	return result;
247	}
248
249	char * make_canonical_path(const char * relative_path) {
250	char * original_directory = xgetcwd();
251	char * base = make_basename(relative_path);
252	char * dir = make_dirname(relative_path);
253
254	xchdir(dir);
255	char * canonical_dir = xgetcwd();
256	char * result = make_path(canonical_dir, base);
257
258	free(canonical_dir);
259	free(base);
260	free(dir);
261	xchdir(original_directory);
262	free(original_directory);
263
264	return result;
265	}
266
267	char * make_basename(const char * path) {
268	char * copy = xstrdup(path);
269	char * result = xstrdup(basename(copy));
270	free(copy);
271	return result;
272	}
273
274	char * make_dirname(const char * path) {
275	char * copy = xstrdup(path);
276	char * result = xstrdup(dirname(copy));
277	free(copy);
278	return result;
279	}
280
281	int is_same_file(const char * file1, const char * file2) {
282	#ifdef _WIN32
283	#define FILECMP strcasecmp
284	#else
285	#define FILECMP strcmp
286	#endif
287	if (FILECMP(file1, file2) == 0) {
288	return 1;
289	}
290
291	char * canonical1 = make_canonical_path(file1);
292	char * canonical2 = make_canonical_path(file2);
293	int cmp = FILECMP(canonical1, canonical2);
294	free(canonical1);
295	free(canonical2);
296	if (cmp == 0) {
297	return 1;
298	}
299
300	#ifndef _WIN32
301	struct stat buf1;
302	if (stat(file1, &buf1) == -1) {
303	if (errno == ENOENT) {
304	return 0;
305	}
306	else {
307	fatal("cannot stat file: %s", file1);
308	}
309	}
310	struct stat buf2;
311	if (stat(file2, &buf2) == -1) {
312	if (errno == ENOENT) {
313	return 0;
314	}
315	else {
316	fatal("cannot stat file: %s", file2);
317	}
318	}
319	if (buf1.st_dev == buf2.st_dev &&
320	buf1.st_ino == buf2.st_ino) {
321	return 1;
322	}
323	#endif
324	return 0;
325	#undef FILECMP
326	}
327
328	int contains_file(const char * file1, const char * file2) {
329	int result = 0;
330	char * ancestor = make_canonical_path(file1);
331	char * d = make_canonical_path(file2);
332	char * parent = make_dirname(d);
333	while (strcmp(d, parent) != 0) {
334	if (is_same_file(ancestor, parent)) {
335	result = 1;
336	break;
337	}
338	free(d);
339	d = parent;
340	parent = make_dirname(d);
341	}
342	free(d);
343	free(parent);
344	free(ancestor);
345	return result;
346	}
347
348	void copy_stream(FILE * source, FILE * destination) {
349	unsigned char buffer[8192];
350	for (;;) {
351	int bytes_read = fread(buffer, 1, sizeof(buffer), source);
352	if (bytes_read == 0) {
353	break;
354	}
355	fwrite(buffer, 1, bytes_read, destination);
356	}
357	}
358
359	void copy_file(const char * source_file, const char * destination_file) {
360	FILE * source = xfopen(source_file, "rb");
361	FILE * destination = xfopen(destination_file, "wb");
362
363	copy_stream(source, destination);
364
365	fclose(source);
366	fclose(destination);
367	}
368
369	bool directory_is_empty(const char * directory) {
370	bool result = true;
371	DIR * dir = xopendir(directory);
372	struct dirent * e;
373	while ((e = readdir(dir)) != NULL) {
374	if (strcmp(e->d_name, ".") != 0 &&
375	strcmp(e->d_name, "..") != 0) {
376	result = false;
377	break;
378	}
379	}
380	closedir(dir);
381	return result;
382	}
383
384	static struct DirListEntry * recursive_dir_list(const char * root, const char * directory_wrt_root, struct DirListEntry * head) {
385	char * directory = directory_wrt_root == NULL? xstrdup(root): make_path(root, directory_wrt_root);
386	DIR * dir = xopendir(directory);
387	struct dirent * e;
388	while ((e = readdir(dir)) != NULL) {
389	if (strcmp(e->d_name, ".") == 0 \|\|
390	strcmp(e->d_name, "..") == 0) {
391	continue;
392	}
393	char * entry = make_path(directory, e->d_name);
394	char * entry_wrt_root = directory_wrt_root == NULL? xstrdup(e->d_name): make_path(directory_wrt_root, e->d_name);
395	struct stat buf;
396	xlstat(entry, &buf);
397	if (S_ISREG(buf.st_mode)) {
398	struct DirListEntry * p = xmalloc(sizeof(struct DirListEntry));
399	p->name = entry_wrt_root;
400	p->next = head;
401	head = p;
402	}
403	else if (S_ISDIR(buf.st_mode)) {
404	head = recursive_dir_list(root, entry_wrt_root, head);
405	free(entry_wrt_root);
406	}
407	else {
408	fatal("unknown file type: %s", entry);
409	}
410	free(entry);
411	}
412	closedir(dir);
413	free(directory);
414	return head;
415	}
416
417	struct DirListEntry * make_recursive_dir_list(const char * directory) {
418	return recursive_dir_list(directory, NULL, NULL);
419	}
420
421	void free_dir_list(struct DirListEntry * list) {
422	while (list != NULL) {
423	struct DirListEntry * next = list->next;
424	free(list->name);
425	free(list);
426	list = next;
427	}
428	}
429
430	#ifndef HAVE_STRNDUP
431	char * strndup(const char * s, size_t size) {
432	size_t length = strlen(s);
433	if (length > size) {
434	char * result = xmalloc(size + 1);
435	strncpy(result, s, size);
436	result[size] = '\0';
437	return result;
438	}
439	else {
440	char * result = xmalloc(length + 1);
441	strcpy(result, s);
442	return result;
443	}
444	}
445	#endif
446
447	#ifndef HAVE_VASPRINTF
448	int vasprintf(char ** s, const char * template, va_list a) {
449	int size = 100;
450	*s = malloc(size);
451	if (*s == NULL) {
452	return -1;
453	}
454
455	va_list copy;
456	va_copy(copy, a);
457	int result = vsnprintf(*s, size, template, copy);
458	if (result >= size) {
459	int new_size = result;
460	if (new_size == INT_MAX) {
461	free(*s);
462	return -1;
463	}
464	new_size++;
465	char * new_s = realloc(*s, new_size);
466	if (new_s == NULL) {
467	free(*s);
468	return -1;
469	}
470	*s = new_s;
471	size = new_size;
472	va_copy(copy, a);
473	result = vsnprintf(*s, size, template, copy);
474	assert(result == size - 1);
475	}
476	else if (result == -1) {
477	while (result == -1) {
478	if (size == INT_MAX) {
479	free(*s);
480	return -1;
481	}
482	int new_size;
483	if (size > INT_MAX / 2) {
484	new_size = INT_MAX;
485	}
486	else {
487	new_size = 2 * size;
488	}
489	char * new_s = realloc(*s, new_size);
490	if (new_s == NULL) {
491	free(*s);
492	return -1;
493	}
494	*s = new_s;
495	size = new_size;
496	va_copy(copy, a);
497	result = vsnprintf(*s, size, template, copy);
498	}
499	assert(result <= size - 1);
500	}
501
502	return result;
503	}
504	#endif
505
506	#ifndef HAVE_ASPRINTF
507	int asprintf(char ** s, const char * template, ...) {
508	va_list a;
509	va_start(a, template);
510	int result = vasprintf(s, template, a);
511	va_end(a);
512	return result;
513	}
514	#endif