[thirdparty/git.git] / t / helper / test-path-utils.c

#include "test-tool.h"
#include "cache.h"
#include "string-list.h"
#include "utf8.h"

/*
 * A "string_list_each_func_t" function that normalizes an entry from
 * GIT_CEILING_DIRECTORIES.  If the path is unusable for some reason,
 * die with an explanation.
 */
static int normalize_ceiling_entry(struct string_list_item *item, void *unused)
{
	char *ceil = item->string;

	if (!*ceil)
		die("Empty path is not supported");
	if (!is_absolute_path(ceil))
		die("Path \"%s\" is not absolute", ceil);
	if (normalize_path_copy(ceil, ceil) < 0)
		die("Path \"%s\" could not be normalized", ceil);
	return 1;
}

static void normalize_argv_string(const char **var, const char *input)
{
	if (!strcmp(input, "<null>"))
		*var = NULL;
	else if (!strcmp(input, "<empty>"))
		*var = "";
	else
		*var = input;

	if (*var && (**var == '<' || **var == '('))
		die("Bad value: %s\n", input);
}

struct test_data {
	const char *from;  /* input:  transform from this ... */
	const char *to;    /* output: ... to this.            */
	const char *alternative; /* output: ... or this.      */
};

/*
 * Compatibility wrappers for OpenBSD, whose basename(3) and dirname(3)
 * have const parameters.
 */
static char *posix_basename(char *path)
{
	return basename(path);
}

static char *posix_dirname(char *path)
{
	return dirname(path);
}

static int test_function(struct test_data *data, char *(*func)(char *input),
	const char *funcname)
{
	int failed = 0, i;
	char buffer[1024];
	char *to;

	for (i = 0; data[i].to; i++) {
		if (!data[i].from)
			to = func(NULL);
		else {
			xsnprintf(buffer, sizeof(buffer), "%s", data[i].from);
			to = func(buffer);
		}
		if (!strcmp(to, data[i].to))
			continue;
		if (!data[i].alternative)
			error("FAIL: %s(%s) => '%s' != '%s'\n",
				funcname, data[i].from, to, data[i].to);
		else if (!strcmp(to, data[i].alternative))
			continue;
		else
			error("FAIL: %s(%s) => '%s' != '%s', '%s'\n",
				funcname, data[i].from, to, data[i].to,
				data[i].alternative);
		failed = 1;
	}
	return failed;
}

static struct test_data basename_data[] = {
	/* --- POSIX type paths --- */
	{ NULL,              "."    },
	{ "",                "."    },
	{ ".",               "."    },
	{ "..",              ".."   },
	{ "/",               "/"    },
	{ "//",              "/", "//" },
	{ "///",             "/", "//" },
	{ "////",            "/", "//" },
	{ "usr",             "usr"  },
	{ "/usr",            "usr"  },
	{ "/usr/",           "usr"  },
	{ "/usr//",          "usr"  },
	{ "/usr/lib",        "lib"  },
	{ "usr/lib",         "lib"  },
	{ "usr/lib///",      "lib"  },

#if defined(__MINGW32__) || defined(_MSC_VER)
	/* --- win32 type paths --- */
	{ "\\usr",           "usr"  },
	{ "\\usr\\",         "usr"  },
	{ "\\usr\\\\",       "usr"  },
	{ "\\usr\\lib",      "lib"  },
	{ "usr\\lib",        "lib"  },
	{ "usr\\lib\\\\\\",  "lib"  },
	{ "C:/usr",          "usr"  },
	{ "C:/usr",          "usr"  },
	{ "C:/usr/",         "usr"  },
	{ "C:/usr//",        "usr"  },
	{ "C:/usr/lib",      "lib"  },
	{ "C:usr/lib",       "lib"  },
	{ "C:usr/lib///",    "lib"  },
	{ "C:",              "."    },
	{ "C:a",             "a"    },
	{ "C:/",             "/"    },
	{ "C:///",           "/"    },
	{ "\\",              "\\", "/" },
	{ "\\\\",            "\\", "/" },
	{ "\\\\\\",          "\\", "/" },
#endif
	{ NULL,              NULL   }
};

static struct test_data dirname_data[] = {
	/* --- POSIX type paths --- */
	{ NULL,              "."      },
	{ "",                "."      },
	{ ".",               "."      },
	{ "..",              "."      },
	{ "/",               "/"      },
	{ "//",              "/", "//" },
	{ "///",             "/", "//" },
	{ "////",            "/", "//" },
	{ "usr",             "."      },
	{ "/usr",            "/"      },
	{ "/usr/",           "/"      },
	{ "/usr//",          "/"      },
	{ "/usr/lib",        "/usr"   },
	{ "usr/lib",         "usr"    },
	{ "usr/lib///",      "usr"    },

#if defined(__MINGW32__) || defined(_MSC_VER)
	/* --- win32 type paths --- */
	{ "\\",              "\\"     },
	{ "\\\\",            "\\\\"   },
	{ "\\usr",           "\\"     },
	{ "\\usr\\",         "\\"     },
	{ "\\usr\\\\",       "\\"     },
	{ "\\usr\\lib",      "\\usr"  },
	{ "usr\\lib",        "usr"    },
	{ "usr\\lib\\\\\\",  "usr"    },
	{ "C:a",             "C:."    },
	{ "C:/",             "C:/"    },
	{ "C:///",           "C:/"    },
	{ "C:/usr",          "C:/"    },
	{ "C:/usr/",         "C:/"    },
	{ "C:/usr//",        "C:/"    },
	{ "C:/usr/lib",      "C:/usr" },
	{ "C:usr/lib",       "C:usr"  },
	{ "C:usr/lib///",    "C:usr"  },
	{ "\\\\\\",          "\\"     },
	{ "\\\\\\\\",        "\\"     },
	{ "C:",              "C:.", "." },
#endif
	{ NULL,              NULL     }
};

static int is_dotgitmodules(const char *path)
{
	return is_hfs_dotgitmodules(path) || is_ntfs_dotgitmodules(path);
}

static int cmp_by_st_size(const void *a, const void *b)
{
	intptr_t x = (intptr_t)((struct string_list_item *)a)->util;
	intptr_t y = (intptr_t)((struct string_list_item *)b)->util;

	return x > y ? -1 : (x < y ? +1 : 0);
}

int cmd__path_utils(int argc, const char **argv)
{
	if (argc == 3 && !strcmp(argv[1], "normalize_path_copy")) {
		char *buf = xmallocz(strlen(argv[2]));
		int rv = normalize_path_copy(buf, argv[2]);
		if (rv)
			buf = "++failed++";
		puts(buf);
		return 0;
	}

	if (argc >= 2 && !strcmp(argv[1], "real_path")) {
		while (argc > 2) {
			puts(real_path(argv[2]));
			argc--;
			argv++;
		}
		return 0;
	}

	if (argc >= 2 && !strcmp(argv[1], "absolute_path")) {
		while (argc > 2) {
			puts(absolute_path(argv[2]));
			argc--;
			argv++;
		}
		return 0;
	}

	if (argc == 4 && !strcmp(argv[1], "longest_ancestor_length")) {
		int len;
		struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
		char *path = xstrdup(argv[2]);

		/*
		 * We have to normalize the arguments because under
		 * Windows, bash mangles arguments that look like
		 * absolute POSIX paths or colon-separate lists of
		 * absolute POSIX paths into DOS paths (e.g.,
		 * "/foo:/foo/bar" might be converted to
		 * "D:\Src\msysgit\foo;D:\Src\msysgit\foo\bar"),
		 * whereas longest_ancestor_length() requires paths
		 * that use forward slashes.
		 */
		if (normalize_path_copy(path, path))
			die("Path \"%s\" could not be normalized", argv[2]);
		string_list_split(&ceiling_dirs, argv[3], PATH_SEP, -1);
		filter_string_list(&ceiling_dirs, 0,
				   normalize_ceiling_entry, NULL);
		len = longest_ancestor_length(path, &ceiling_dirs);
		string_list_clear(&ceiling_dirs, 0);
		free(path);
		printf("%d\n", len);
		return 0;
	}

	if (argc >= 4 && !strcmp(argv[1], "prefix_path")) {
		const char *prefix = argv[2];
		int prefix_len = strlen(prefix);
		int nongit_ok;
		setup_git_directory_gently(&nongit_ok);
		while (argc > 3) {
			puts(prefix_path(prefix, prefix_len, argv[3]));
			argc--;
			argv++;
		}
		return 0;
	}

	if (argc == 4 && !strcmp(argv[1], "strip_path_suffix")) {
		char *prefix = strip_path_suffix(argv[2], argv[3]);
		printf("%s\n", prefix ? prefix : "(null)");
		return 0;
	}

	if (argc == 3 && !strcmp(argv[1], "print_path")) {
		puts(argv[2]);
		return 0;
	}

	if (argc == 4 && !strcmp(argv[1], "relative_path")) {
		struct strbuf sb = STRBUF_INIT;
		const char *in, *prefix, *rel;
		normalize_argv_string(&in, argv[2]);
		normalize_argv_string(&prefix, argv[3]);
		rel = relative_path(in, prefix, &sb);
		if (!rel)
			puts("(null)");
		else
			puts(strlen(rel) > 0 ? rel : "(empty)");
		strbuf_release(&sb);
		return 0;
	}

	if (argc == 2 && !strcmp(argv[1], "basename"))
		return test_function(basename_data, posix_basename, argv[1]);

	if (argc == 2 && !strcmp(argv[1], "dirname"))
		return test_function(dirname_data, posix_dirname, argv[1]);

	if (argc > 2 && !strcmp(argv[1], "is_dotgitmodules")) {
		int res = 0, expect = 1, i;
		for (i = 2; i < argc; i++)
			if (!strcmp("--not", argv[i]))
				expect = !expect;
			else if (expect != is_dotgitmodules(argv[i]))
				res = error("'%s' is %s.gitmodules", argv[i],
					    expect ? "not " : "");
			else
				fprintf(stderr, "ok: '%s' is %s.gitmodules\n",
					argv[i], expect ? "" : "not ");
		return !!res;
	}

	if (argc > 2 && !strcmp(argv[1], "file-size")) {
		int res = 0, i;
		struct stat st;

		for (i = 2; i < argc; i++)
			if (stat(argv[i], &st))
				res = error_errno("Cannot stat '%s'", argv[i]);
			else
				printf("%"PRIuMAX"\n", (uintmax_t)st.st_size);
		return !!res;
	}

	if (argc == 4 && !strcmp(argv[1], "skip-n-bytes")) {
		int fd = open(argv[2], O_RDONLY), offset = atoi(argv[3]);
		char buffer[65536];

		if (fd < 0)
			die_errno("could not open '%s'", argv[2]);
		if (lseek(fd, offset, SEEK_SET) < 0)
			die_errno("could not skip %d bytes", offset);
		for (;;) {
			ssize_t count = read(fd, buffer, sizeof(buffer));
			if (count < 0)
				die_errno("could not read '%s'", argv[2]);
			if (!count)
				break;
			if (write(1, buffer, count) < 0)
				die_errno("could not write to stdout");
		}
		close(fd);
		return 0;
	}

	if (argc > 5 && !strcmp(argv[1], "slice-tests")) {
		int res = 0;
		long offset, stride, i;
		struct string_list list = STRING_LIST_INIT_NODUP;
		struct stat st;

		offset = strtol(argv[2], NULL, 10);
		stride = strtol(argv[3], NULL, 10);
		if (stride < 1)
			stride = 1;
		for (i = 4; i < argc; i++)
			if (stat(argv[i], &st))
				res = error_errno("Cannot stat '%s'", argv[i]);
			else
				string_list_append(&list, argv[i])->util =
					(void *)(intptr_t)st.st_size;
		QSORT(list.items, list.nr, cmp_by_st_size);
		for (i = offset; i < list.nr; i+= stride)
			printf("%s\n", list.items[i].string);

		return !!res;
	}

	fprintf(stderr, "%s: unknown function name: %s\n", argv[0],
		argv[1] ? argv[1] : "(there was none)");
	return 1;
}
Commit	Line	Data
b8d5cf4f	1	#include "test-tool.h"
ae299be0	2	#include "cache.h"
31171d9e	3	#include "string-list.h"
dc2d9ba3	4	#include "utf8.h"
ae299be0	5
9e2326c7 MH	6	/*
	7	* A "string_list_each_func_t" function that normalizes an entry from
	8	* GIT_CEILING_DIRECTORIES. If the path is unusable for some reason,
	9	* die with an explanation.
	10	*/
	11	static int normalize_ceiling_entry(struct string_list_item item, void unused)
	12	{
62f17513	13	char *ceil = item->string;
9e2326c7	14
62f17513	15	if (!*ceil)
9e2326c7	16	die("Empty path is not supported");
9e2326c7 MH	17	if (!is_absolute_path(ceil))
9e2326c7 MH	18	die("Path \"%s\" is not absolute", ceil);
62f17513	19	if (normalize_path_copy(ceil, ceil) < 0)
9e2326c7	20	die("Path \"%s\" could not be normalized", ceil);
9e2326c7 MH	21	return 1;
	22	}
	23
203439b2 JX	24	static void normalize_argv_string(const char *var, const char input)
	25	{
	26	if (!strcmp(input, "<null>"))
	27	*var = NULL;
	28	else if (!strcmp(input, "<empty>"))
	29	*var = "";
	30	else
	31	*var = input;
	32
	33	if (var && (var == '<' \|\| *var == '('))
	34	die("Bad value: %s\n", input);
	35	}
	36
7d1aaa68 JS	37	struct test_data {
	38	const char from; / input: transform from this ... */
	39	const char to; / output: ... to this. */
371471ce	40	const char alternative; / output: ... or this. */
7d1aaa68 JS	41	};
7d1aaa68 JS	42
29c2eda8 RS	43	/*
	44	* Compatibility wrappers for OpenBSD, whose basename(3) and dirname(3)
	45	* have const parameters.
	46	*/
	47	static char posix_basename(char path)
	48	{
	49	return basename(path);
	50	}
	51
	52	static char posix_dirname(char path)
	53	{
	54	return dirname(path);
	55	}
	56
7d1aaa68 JS	57	static int test_function(struct test_data data, char (func)(char input),
	58	const char *funcname)
	59	{
	60	int failed = 0, i;
	61	char buffer[1024];
	62	char *to;
	63
	64	for (i = 0; data[i].to; i++) {
	65	if (!data[i].from)
	66	to = func(NULL);
	67	else {
7b11a18a	68	xsnprintf(buffer, sizeof(buffer), "%s", data[i].from);
7d1aaa68 JS	69	to = func(buffer);
7d1aaa68 JS	70	}
371471ce JS	71	if (!strcmp(to, data[i].to))
	72	continue;
	73	if (!data[i].alternative)
7d1aaa68 JS	74	error("FAIL: %s(%s) => '%s' != '%s'\n",
7d1aaa68 JS	75	funcname, data[i].from, to, data[i].to);
371471ce JS	76	else if (!strcmp(to, data[i].alternative))
	77	continue;
	78	else
	79	error("FAIL: %s(%s) => '%s' != '%s', '%s'\n",
	80	funcname, data[i].from, to, data[i].to,
	81	data[i].alternative);
	82	failed = 1;
7d1aaa68 JS	83	}
	84	return failed;
	85	}
	86
	87	static struct test_data basename_data[] = {
	88	/* --- POSIX type paths --- */
	89	{ NULL, "." },
	90	{ "", "." },
	91	{ ".", "." },
	92	{ "..", ".." },
	93	{ "/", "/" },
371471ce JS	94	{ "//", "/", "//" },
	95	{ "///", "/", "//" },
	96	{ "////", "/", "//" },
7d1aaa68 JS	97	{ "usr", "usr" },
	98	{ "/usr", "usr" },
	99	{ "/usr/", "usr" },
	100	{ "/usr//", "usr" },
	101	{ "/usr/lib", "lib" },
	102	{ "usr/lib", "lib" },
	103	{ "usr/lib///", "lib" },
	104
	105	#if defined(__MINGW32__) \|\| defined(_MSC_VER)
7d1aaa68 JS	106	/* --- win32 type paths --- */
	107	{ "\\usr", "usr" },
	108	{ "\\usr\\", "usr" },
	109	{ "\\usr\\\\", "usr" },
	110	{ "\\usr\\lib", "lib" },
	111	{ "usr\\lib", "lib" },
	112	{ "usr\\lib\\\\\\", "lib" },
	113	{ "C:/usr", "usr" },
	114	{ "C:/usr", "usr" },
	115	{ "C:/usr/", "usr" },
	116	{ "C:/usr//", "usr" },
	117	{ "C:/usr/lib", "lib" },
	118	{ "C:usr/lib", "lib" },
	119	{ "C:usr/lib///", "lib" },
	120	{ "C:", "." },
	121	{ "C:a", "a" },
	122	{ "C:/", "/" },
	123	{ "C:///", "/" },
371471ce JS	124	{ "\\", "\\", "/" },
	125	{ "\\\\", "\\", "/" },
	126	{ "\\\\\\", "\\", "/" },
7d1aaa68 JS	127	#endif
	128	{ NULL, NULL }
	129	};
	130
	131	static struct test_data dirname_data[] = {
	132	/* --- POSIX type paths --- */
	133	{ NULL, "." },
	134	{ "", "." },
	135	{ ".", "." },
	136	{ "..", "." },
	137	{ "/", "/" },
371471ce JS	138	{ "//", "/", "//" },
	139	{ "///", "/", "//" },
	140	{ "////", "/", "//" },
7d1aaa68 JS	141	{ "usr", "." },
	142	{ "/usr", "/" },
	143	{ "/usr/", "/" },
	144	{ "/usr//", "/" },
	145	{ "/usr/lib", "/usr" },
	146	{ "usr/lib", "usr" },
	147	{ "usr/lib///", "usr" },
	148
	149	#if defined(__MINGW32__) \|\| defined(_MSC_VER)
7d1aaa68 JS	150	/* --- win32 type paths --- */
	151	{ "\\", "\\" },
	152	{ "\\\\", "\\\\" },
	153	{ "\\usr", "\\" },
	154	{ "\\usr\\", "\\" },
	155	{ "\\usr\\\\", "\\" },
	156	{ "\\usr\\lib", "\\usr" },
	157	{ "usr\\lib", "usr" },
	158	{ "usr\\lib\\\\\\", "usr" },
	159	{ "C:a", "C:." },
	160	{ "C:/", "C:/" },
	161	{ "C:///", "C:/" },
	162	{ "C:/usr", "C:/" },
	163	{ "C:/usr/", "C:/" },
	164	{ "C:/usr//", "C:/" },
	165	{ "C:/usr/lib", "C:/usr" },
	166	{ "C:usr/lib", "C:usr" },
	167	{ "C:usr/lib///", "C:usr" },
	168	{ "\\\\\\", "\\" },
	169	{ "\\\\\\\\", "\\" },
371471ce	170	{ "C:", "C:.", "." },
7d1aaa68 JS	171	#endif
	172	{ NULL, NULL }
	173	};
	174
dc2d9ba3 JS	175	static int is_dotgitmodules(const char *path)
	176	{
	177	return is_hfs_dotgitmodules(path) \|\| is_ntfs_dotgitmodules(path);
	178	}
	179
b819f1d2 JS	180	static int cmp_by_st_size(const void a, const void b)
	181	{
	182	intptr_t x = (intptr_t)((struct string_list_item *)a)->util;
	183	intptr_t y = (intptr_t)((struct string_list_item *)b)->util;
	184
	185	return x > y ? -1 : (x < y ? +1 : 0);
	186	}
	187
b8d5cf4f	188	int cmd__path_utils(int argc, const char **argv)
ae299be0	189	{
f42302b4	190	if (argc == 3 && !strcmp(argv[1], "normalize_path_copy")) {
62f17513	191	char *buf = xmallocz(strlen(argv[2]));
f42302b4 JS	192	int rv = normalize_path_copy(buf, argv[2]);
	193	if (rv)
	194	buf = "++failed++";
ae299be0	195	puts(buf);
2cd85c40	196	return 0;
ae299be0 DR	197	}
ae299be0 DR	198
e2a57aac	199	if (argc >= 2 && !strcmp(argv[1], "real_path")) {
d553e737	200	while (argc > 2) {
e2a57aac	201	puts(real_path(argv[2]));
d553e737 DR	202	argc--;
	203	argv++;
	204	}
2cd85c40	205	return 0;
d553e737 DR	206	}
d553e737 DR	207
87a246e1 MH	208	if (argc >= 2 && !strcmp(argv[1], "absolute_path")) {
	209	while (argc > 2) {
	210	puts(absolute_path(argv[2]));
	211	argc--;
	212	argv++;
	213	}
	214	return 0;
	215	}
	216
0454dd93	217	if (argc == 4 && !strcmp(argv[1], "longest_ancestor_length")) {
31171d9e MH	218	int len;
31171d9e MH	219	struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
9e2326c7	220	char *path = xstrdup(argv[2]);
31171d9e	221
9e2326c7 MH	222	/*
	223	* We have to normalize the arguments because under
	224	* Windows, bash mangles arguments that look like
	225	* absolute POSIX paths or colon-separate lists of
	226	* absolute POSIX paths into DOS paths (e.g.,
	227	* "/foo:/foo/bar" might be converted to
	228	* "D:\Src\msysgit\foo;D:\Src\msysgit\foo\bar"),
	229	* whereas longest_ancestor_length() requires paths
	230	* that use forward slashes.
	231	*/
	232	if (normalize_path_copy(path, path))
	233	die("Path \"%s\" could not be normalized", argv[2]);
31171d9e	234	string_list_split(&ceiling_dirs, argv[3], PATH_SEP, -1);
9e2326c7 MH	235	filter_string_list(&ceiling_dirs, 0,
	236	normalize_ceiling_entry, NULL);
	237	len = longest_ancestor_length(path, &ceiling_dirs);
31171d9e	238	string_list_clear(&ceiling_dirs, 0);
9e2326c7	239	free(path);
0454dd93	240	printf("%d\n", len);
2cd85c40	241	return 0;
0454dd93 DR	242	}
0454dd93 DR	243
9e813723	244	if (argc >= 4 && !strcmp(argv[1], "prefix_path")) {
3f2e2297	245	const char *prefix = argv[2];
9e813723 MH	246	int prefix_len = strlen(prefix);
	247	int nongit_ok;
	248	setup_git_directory_gently(&nongit_ok);
	249	while (argc > 3) {
	250	puts(prefix_path(prefix, prefix_len, argv[3]));
	251	argc--;
	252	argv++;
	253	}
	254	return 0;
	255	}
	256
4fcc86b0 JS	257	if (argc == 4 && !strcmp(argv[1], "strip_path_suffix")) {
	258	char *prefix = strip_path_suffix(argv[2], argv[3]);
	259	printf("%s\n", prefix ? prefix : "(null)");
	260	return 0;
	261	}
	262
7ffd18fc	263	if (argc == 3 && !strcmp(argv[1], "print_path")) {
abd4284b JX	264	puts(argv[2]);
	265	return 0;
	266	}
	267
203439b2	268	if (argc == 4 && !strcmp(argv[1], "relative_path")) {
e02ca72f	269	struct strbuf sb = STRBUF_INIT;
203439b2 JX	270	const char in, prefix, *rel;
	271	normalize_argv_string(&in, argv[2]);
	272	normalize_argv_string(&prefix, argv[3]);
e02ca72f	273	rel = relative_path(in, prefix, &sb);
203439b2 JX	274	if (!rel)
	275	puts("(null)");
	276	else
	277	puts(strlen(rel) > 0 ? rel : "(empty)");
e02ca72f	278	strbuf_release(&sb);
203439b2 JX	279	return 0;
	280	}
	281
7d1aaa68	282	if (argc == 2 && !strcmp(argv[1], "basename"))
29c2eda8	283	return test_function(basename_data, posix_basename, argv[1]);
7d1aaa68 JS	284
7d1aaa68 JS	285	if (argc == 2 && !strcmp(argv[1], "dirname"))
29c2eda8	286	return test_function(dirname_data, posix_dirname, argv[1]);
7d1aaa68	287
dc2d9ba3 JS	288	if (argc > 2 && !strcmp(argv[1], "is_dotgitmodules")) {
	289	int res = 0, expect = 1, i;
	290	for (i = 2; i < argc; i++)
	291	if (!strcmp("--not", argv[i]))
	292	expect = !expect;
	293	else if (expect != is_dotgitmodules(argv[i]))
	294	res = error("'%s' is %s.gitmodules", argv[i],
	295	expect ? "not " : "");
	296	else
	297	fprintf(stderr, "ok: '%s' is %s.gitmodules\n",
	298	argv[i], expect ? "" : "not ");
	299	return !!res;
	300	}
	301
5868bd86 JS	302	if (argc > 2 && !strcmp(argv[1], "file-size")) {
	303	int res = 0, i;
	304	struct stat st;
	305
	306	for (i = 2; i < argc; i++)
	307	if (stat(argv[i], &st))
	308	res = error_errno("Cannot stat '%s'", argv[i]);
	309	else
	310	printf("%"PRIuMAX"\n", (uintmax_t)st.st_size);
	311	return !!res;
	312	}
	313
af9912ef JS	314	if (argc == 4 && !strcmp(argv[1], "skip-n-bytes")) {
	315	int fd = open(argv[2], O_RDONLY), offset = atoi(argv[3]);
	316	char buffer[65536];
	317
	318	if (fd < 0)
	319	die_errno("could not open '%s'", argv[2]);
	320	if (lseek(fd, offset, SEEK_SET) < 0)
	321	die_errno("could not skip %d bytes", offset);
	322	for (;;) {
	323	ssize_t count = read(fd, buffer, sizeof(buffer));
	324	if (count < 0)
	325	die_errno("could not read '%s'", argv[2]);
	326	if (!count)
	327	break;
	328	if (write(1, buffer, count) < 0)
	329	die_errno("could not write to stdout");
	330	}
	331	close(fd);
	332	return 0;
	333	}
	334
b819f1d2 JS	335	if (argc > 5 && !strcmp(argv[1], "slice-tests")) {
	336	int res = 0;
	337	long offset, stride, i;
	338	struct string_list list = STRING_LIST_INIT_NODUP;
	339	struct stat st;
	340
	341	offset = strtol(argv[2], NULL, 10);
	342	stride = strtol(argv[3], NULL, 10);
	343	if (stride < 1)
	344	stride = 1;
	345	for (i = 4; i < argc; i++)
	346	if (stat(argv[i], &st))
	347	res = error_errno("Cannot stat '%s'", argv[i]);
	348	else
	349	string_list_append(&list, argv[i])->util =
	350	(void *)(intptr_t)st.st_size;
	351	QSORT(list.items, list.nr, cmp_by_st_size);
	352	for (i = offset; i < list.nr; i+= stride)
	353	printf("%s\n", list.items[i].string);
	354
	355	return !!res;
	356	}
	357
2cd85c40 JS	358	fprintf(stderr, "%s: unknown function name: %s\n", argv[0],
	359	argv[1] ? argv[1] : "(there was none)");
	360	return 1;
ae299be0	361	}