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	#include "cache.h"
	#include "refs.h"
	#include "string-list.h"
	#include "utf8.h"

	int starts_with(const char str, const char prefix)
	{
	for (; ; str++, prefix++)
	if (!*prefix)
	return 1;
	else if (str != prefix)
	return 0;
	}

	int istarts_with(const char str, const char prefix)
	{
	for (; ; str++, prefix++)
	if (!*prefix)
	return 1;
	else if (tolower(str) != tolower(prefix))
	return 0;
	}

	int skip_to_optional_arg_default(const char str, const char prefix,
	const char *arg, const char def)
	{
	const char *p;

	if (!skip_prefix(str, prefix, &p))
	return 0;

	if (!*p) {
	if (arg)
	*arg = def;
	return 1;
	}

	if (*p != '=')
	return 0;

	if (arg)
	*arg = p + 1;
	return 1;
	}

	/*
	* Used as the default ->buf value, so that people can always assume
	* buf is non NULL and ->buf is NUL terminated even for a freshly
	* initialized strbuf.
	*/
	char strbuf_slopbuf[1];

	void strbuf_init(struct strbuf *sb, size_t hint)
	{
	sb->alloc = sb->len = 0;
	sb->buf = strbuf_slopbuf;
	if (hint)
	strbuf_grow(sb, hint);
	}

	void strbuf_release(struct strbuf *sb)
	{
	if (sb->alloc) {
	free(sb->buf);
	strbuf_init(sb, 0);
	}
	}

	char strbuf_detach(struct strbuf sb, size_t *sz)
	{
	char *res;
	strbuf_grow(sb, 0);
	res = sb->buf;
	if (sz)
	*sz = sb->len;
	strbuf_init(sb, 0);
	return res;
	}

	void strbuf_attach(struct strbuf sb, void buf, size_t len, size_t alloc)
	{
	strbuf_release(sb);
	sb->buf = buf;
	sb->len = len;
	sb->alloc = alloc;
	strbuf_grow(sb, 0);
	sb->buf[sb->len] = '\0';
	}

	void strbuf_grow(struct strbuf *sb, size_t extra)
	{
	int new_buf = !sb->alloc;
	if (unsigned_add_overflows(extra, 1) \|\|
	unsigned_add_overflows(sb->len, extra + 1))
	die("you want to use way too much memory");
	if (new_buf)
	sb->buf = NULL;
	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
	if (new_buf)
	sb->buf[0] = '\0';
	}

	void strbuf_trim(struct strbuf *sb)
	{
	strbuf_rtrim(sb);
	strbuf_ltrim(sb);
	}

	void strbuf_rtrim(struct strbuf *sb)
	{
	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
	sb->len--;
	sb->buf[sb->len] = '\0';
	}

	void strbuf_trim_trailing_dir_sep(struct strbuf *sb)
	{
	while (sb->len > 0 && is_dir_sep((unsigned char)sb->buf[sb->len - 1]))
	sb->len--;
	sb->buf[sb->len] = '\0';
	}

	void strbuf_trim_trailing_newline(struct strbuf *sb)
	{
	if (sb->len > 0 && sb->buf[sb->len - 1] == '\n') {
	if (--sb->len > 0 && sb->buf[sb->len - 1] == '\r')
	--sb->len;
	sb->buf[sb->len] = '\0';
	}
	}

	void strbuf_ltrim(struct strbuf *sb)
	{
	char *b = sb->buf;
	while (sb->len > 0 && isspace(*b)) {
	b++;
	sb->len--;
	}
	memmove(sb->buf, b, sb->len);
	sb->buf[sb->len] = '\0';
	}

	int strbuf_reencode(struct strbuf sb, const char from, const char *to)
	{
	char *out;
	size_t len;

	if (same_encoding(from, to))
	return 0;

	out = reencode_string_len(sb->buf, sb->len, to, from, &len);
	if (!out)
	return -1;

	strbuf_attach(sb, out, len, len);
	return 0;
	}

	void strbuf_tolower(struct strbuf *sb)
	{
	char p = sb->buf, end = sb->buf + sb->len;
	for (; p < end; p++)
	p = tolower(p);
	}

	struct strbuf *strbuf_split_buf(const char str, size_t slen,
	int terminator, int max)
	{
	struct strbuf **ret = NULL;
	size_t nr = 0, alloc = 0;
	struct strbuf *t;

	while (slen) {
	int len = slen;
	if (max <= 0 \|\| nr + 1 < max) {
	const char *end = memchr(str, terminator, slen);
	if (end)
	len = end - str + 1;
	}
	t = xmalloc(sizeof(struct strbuf));
	strbuf_init(t, len);
	strbuf_add(t, str, len);
	ALLOC_GROW(ret, nr + 2, alloc);
	ret[nr++] = t;
	str += len;
	slen -= len;
	}
	ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
	ret[nr] = NULL;
	return ret;
	}

	void strbuf_add_separated_string_list(struct strbuf *str,
	const char *sep,
	struct string_list *slist)
	{
	struct string_list_item *item;
	int sep_needed = 0;

	for_each_string_list_item(item, slist) {
	if (sep_needed)
	strbuf_addstr(str, sep);
	strbuf_addstr(str, item->string);
	sep_needed = 1;
	}
	}

	void strbuf_list_free(struct strbuf **sbs)
	{
	struct strbuf **s = sbs;

	while (*s) {
	strbuf_release(*s);
	free(*s++);
	}
	free(sbs);
	}

	int strbuf_cmp(const struct strbuf a, const struct strbuf b)
	{
	size_t len = a->len < b->len ? a->len: b->len;
	int cmp = memcmp(a->buf, b->buf, len);
	if (cmp)
	return cmp;
	return a->len < b->len ? -1: a->len != b->len;
	}

	void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
	const void *data, size_t dlen)
	{
	if (unsigned_add_overflows(pos, len))
	die("you want to use way too much memory");
	if (pos > sb->len)
	die("`pos' is too far after the end of the buffer");
	if (pos + len > sb->len)
	die("`pos + len' is too far after the end of the buffer");

	if (dlen >= len)
	strbuf_grow(sb, dlen - len);
	memmove(sb->buf + pos + dlen,
	sb->buf + pos + len,
	sb->len - pos - len);
	memcpy(sb->buf + pos, data, dlen);
	strbuf_setlen(sb, sb->len + dlen - len);
	}

	void strbuf_insert(struct strbuf sb, size_t pos, const void data, size_t len)
	{
	strbuf_splice(sb, pos, 0, data, len);
	}

	void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
	{
	strbuf_splice(sb, pos, len, "", 0);
	}

	void strbuf_add(struct strbuf sb, const void data, size_t len)
	{
	strbuf_grow(sb, len);
	memcpy(sb->buf + sb->len, data, len);
	strbuf_setlen(sb, sb->len + len);
	}

	void strbuf_addbuf(struct strbuf sb, const struct strbuf sb2)
	{
	strbuf_grow(sb, sb2->len);
	memcpy(sb->buf + sb->len, sb2->buf, sb2->len);
	strbuf_setlen(sb, sb->len + sb2->len);
	}

	void strbuf_addchars(struct strbuf *sb, int c, size_t n)
	{
	strbuf_grow(sb, n);
	memset(sb->buf + sb->len, c, n);
	strbuf_setlen(sb, sb->len + n);
	}

	void strbuf_addf(struct strbuf sb, const char fmt, ...)
	{
	va_list ap;
	va_start(ap, fmt);
	strbuf_vaddf(sb, fmt, ap);
	va_end(ap);
	}

	static void add_lines(struct strbuf *out,
	const char *prefix1,
	const char *prefix2,
	const char *buf, size_t size)
	{
	while (size) {
	const char *prefix;
	const char *next = memchr(buf, '\n', size);
	next = next ? (next + 1) : (buf + size);

	prefix = ((prefix2 && (buf[0] == '\n' \|\| buf[0] == '\t'))
	? prefix2 : prefix1);
	strbuf_addstr(out, prefix);
	strbuf_add(out, buf, next - buf);
	size -= next - buf;
	buf = next;
	}
	strbuf_complete_line(out);
	}

	void strbuf_add_commented_lines(struct strbuf out, const char buf, size_t size)
	{
	static char prefix1[3];
	static char prefix2[2];

	if (prefix1[0] != comment_line_char) {
	xsnprintf(prefix1, sizeof(prefix1), "%c ", comment_line_char);
	xsnprintf(prefix2, sizeof(prefix2), "%c", comment_line_char);
	}
	add_lines(out, prefix1, prefix2, buf, size);
	}

	void strbuf_commented_addf(struct strbuf sb, const char fmt, ...)
	{
	va_list params;
	struct strbuf buf = STRBUF_INIT;
	int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';

	va_start(params, fmt);
	strbuf_vaddf(&buf, fmt, params);
	va_end(params);

	strbuf_add_commented_lines(sb, buf.buf, buf.len);
	if (incomplete_line)
	sb->buf[--sb->len] = '\0';

	strbuf_release(&buf);
	}

	void strbuf_vaddf(struct strbuf sb, const char fmt, va_list ap)
	{
	int len;
	va_list cp;

	if (!strbuf_avail(sb))
	strbuf_grow(sb, 64);
	va_copy(cp, ap);
	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
	va_end(cp);
	if (len < 0)
	BUG("your vsnprintf is broken (returned %d)", len);
	if (len > strbuf_avail(sb)) {
	strbuf_grow(sb, len);
	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
	if (len > strbuf_avail(sb))
	BUG("your vsnprintf is broken (insatiable)");
	}
	strbuf_setlen(sb, sb->len + len);
	}

	void strbuf_expand(struct strbuf sb, const char format, expand_fn_t fn,
	void *context)
	{
	for (;;) {
	const char *percent;
	size_t consumed;

	percent = strchrnul(format, '%');
	strbuf_add(sb, format, percent - format);
	if (!*percent)
	break;
	format = percent + 1;

	if (*format == '%') {
	strbuf_addch(sb, '%');
	format++;
	continue;
	}

	consumed = fn(sb, format, context);
	if (consumed)
	format += consumed;
	else
	strbuf_addch(sb, '%');
	}
	}

	size_t strbuf_expand_dict_cb(struct strbuf sb, const char placeholder,
	void *context)
	{
	struct strbuf_expand_dict_entry *e = context;
	size_t len;

	for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
	if (!strncmp(placeholder, e->placeholder, len)) {
	if (e->value)
	strbuf_addstr(sb, e->value);
	return len;
	}
	}
	return 0;
	}

	void strbuf_addbuf_percentquote(struct strbuf dst, const struct strbuf src)
	{
	size_t i, len = src->len;

	for (i = 0; i < len; i++) {
	if (src->buf[i] == '%')
	strbuf_addch(dst, '%');
	strbuf_addch(dst, src->buf[i]);
	}
	}

	size_t strbuf_fread(struct strbuf sb, size_t size, FILE f)
	{
	size_t res;
	size_t oldalloc = sb->alloc;

	strbuf_grow(sb, size);
	res = fread(sb->buf + sb->len, 1, size, f);
	if (res > 0)
	strbuf_setlen(sb, sb->len + res);
	else if (oldalloc == 0)
	strbuf_release(sb);
	return res;
	}

	ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
	{
	size_t oldlen = sb->len;
	size_t oldalloc = sb->alloc;

	strbuf_grow(sb, hint ? hint : 8192);
	for (;;) {
	ssize_t want = sb->alloc - sb->len - 1;
	ssize_t got = read_in_full(fd, sb->buf + sb->len, want);

	if (got < 0) {
	if (oldalloc == 0)
	strbuf_release(sb);
	else
	strbuf_setlen(sb, oldlen);
	return -1;
	}
	sb->len += got;
	if (got < want)
	break;
	strbuf_grow(sb, 8192);
	}

	sb->buf[sb->len] = '\0';
	return sb->len - oldlen;
	}

	ssize_t strbuf_read_once(struct strbuf *sb, int fd, size_t hint)
	{
	size_t oldalloc = sb->alloc;
	ssize_t cnt;

	strbuf_grow(sb, hint ? hint : 8192);
	cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
	if (cnt > 0)
	strbuf_setlen(sb, sb->len + cnt);
	else if (oldalloc == 0)
	strbuf_release(sb);
	return cnt;
	}

	ssize_t strbuf_write(struct strbuf sb, FILE f)
	{
	return sb->len ? fwrite(sb->buf, 1, sb->len, f) : 0;
	}


	#define STRBUF_MAXLINK (2*PATH_MAX)

	int strbuf_readlink(struct strbuf sb, const char path, size_t hint)
	{
	size_t oldalloc = sb->alloc;

	if (hint < 32)
	hint = 32;

	while (hint < STRBUF_MAXLINK) {
	ssize_t len;

	strbuf_grow(sb, hint);
	len = readlink(path, sb->buf, hint);
	if (len < 0) {
	if (errno != ERANGE)
	break;
	} else if (len < hint) {
	strbuf_setlen(sb, len);
	return 0;
	}

	/* .. the buffer was too small - try again */
	hint *= 2;
	}
	if (oldalloc == 0)
	strbuf_release(sb);
	return -1;
	}

	int strbuf_getcwd(struct strbuf *sb)
	{
	size_t oldalloc = sb->alloc;
	size_t guessed_len = 128;

	for (;; guessed_len *= 2) {
	strbuf_grow(sb, guessed_len);
	if (getcwd(sb->buf, sb->alloc)) {
	strbuf_setlen(sb, strlen(sb->buf));
	return 0;
	}

	/*
	* If getcwd(3) is implemented as a syscall that falls
	* back to a regular lookup using readdir(3) etc. then
	* we may be able to avoid EACCES by providing enough
	* space to the syscall as it's not necessarily bound
	* to the same restrictions as the fallback.
	*/
	if (errno == EACCES && guessed_len < PATH_MAX)
	continue;

	if (errno != ERANGE)
	break;
	}
	if (oldalloc == 0)
	strbuf_release(sb);
	else
	strbuf_reset(sb);
	return -1;
	}

	#ifdef HAVE_GETDELIM
	int strbuf_getwholeline(struct strbuf sb, FILE fp, int term)
	{
	ssize_t r;

	if (feof(fp))
	return EOF;

	strbuf_reset(sb);

	/* Translate slopbuf to NULL, as we cannot call realloc on it */
	if (!sb->alloc)
	sb->buf = NULL;
	errno = 0;
	r = getdelim(&sb->buf, &sb->alloc, term, fp);

	if (r > 0) {
	sb->len = r;
	return 0;
	}
	assert(r == -1);

	/*
	* Normally we would have called xrealloc, which will try to free
	* memory and recover. But we have no way to tell getdelim() to do so.
	* Worse, we cannot try to recover ENOMEM ourselves, because we have
	* no idea how many bytes were read by getdelim.
	*
	* Dying here is reasonable. It mirrors what xrealloc would do on
	* catastrophic memory failure. We skip the opportunity to free pack
	* memory and retry, but that's unlikely to help for a malloc small
	* enough to hold a single line of input, anyway.
	*/
	if (errno == ENOMEM)
	die("Out of memory, getdelim failed");

	/*
	* Restore strbuf invariants; if getdelim left us with a NULL pointer,
	* we can just re-init, but otherwise we should make sure that our
	* length is empty, and that the result is NUL-terminated.
	*/
	if (!sb->buf)
	strbuf_init(sb, 0);
	else
	strbuf_reset(sb);
	return EOF;
	}
	#else
	int strbuf_getwholeline(struct strbuf sb, FILE fp, int term)
	{
	int ch;

	if (feof(fp))
	return EOF;

	strbuf_reset(sb);
	flockfile(fp);
	while ((ch = getc_unlocked(fp)) != EOF) {
	if (!strbuf_avail(sb))
	strbuf_grow(sb, 1);
	sb->buf[sb->len++] = ch;
	if (ch == term)
	break;
	}
	funlockfile(fp);
	if (ch == EOF && sb->len == 0)
	return EOF;

	sb->buf[sb->len] = '\0';
	return 0;
	}
	#endif

	static int strbuf_getdelim(struct strbuf sb, FILE fp, int term)
	{
	if (strbuf_getwholeline(sb, fp, term))
	return EOF;
	if (sb->buf[sb->len - 1] == term)
	strbuf_setlen(sb, sb->len - 1);
	return 0;
	}

	int strbuf_getline(struct strbuf sb, FILE fp)
	{
	if (strbuf_getwholeline(sb, fp, '\n'))
	return EOF;
	if (sb->buf[sb->len - 1] == '\n') {
	strbuf_setlen(sb, sb->len - 1);
	if (sb->len && sb->buf[sb->len - 1] == '\r')
	strbuf_setlen(sb, sb->len - 1);
	}
	return 0;
	}

	int strbuf_getline_lf(struct strbuf sb, FILE fp)
	{
	return strbuf_getdelim(sb, fp, '\n');
	}

	int strbuf_getline_nul(struct strbuf sb, FILE fp)
	{
	return strbuf_getdelim(sb, fp, '\0');
	}

	int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
	{
	strbuf_reset(sb);

	while (1) {
	char ch;
	ssize_t len = xread(fd, &ch, 1);
	if (len <= 0)
	return EOF;
	strbuf_addch(sb, ch);
	if (ch == term)
	break;
	}
	return 0;
	}

	ssize_t strbuf_read_file(struct strbuf sb, const char path, size_t hint)
	{
	int fd;
	ssize_t len;
	int saved_errno;

	fd = open(path, O_RDONLY);
	if (fd < 0)
	return -1;
	len = strbuf_read(sb, fd, hint);
	saved_errno = errno;
	close(fd);
	if (len < 0) {
	errno = saved_errno;
	return -1;
	}

	return len;
	}

	void strbuf_add_lines(struct strbuf out, const char prefix,
	const char *buf, size_t size)
	{
	add_lines(out, prefix, NULL, buf, size);
	}

	void strbuf_addstr_xml_quoted(struct strbuf buf, const char s)
	{
	while (*s) {
	size_t len = strcspn(s, "\"<>&");
	strbuf_add(buf, s, len);
	s += len;
	switch (*s) {
	case '"':
	strbuf_addstr(buf, """);
	break;
	case '<':
	strbuf_addstr(buf, "<");
	break;
	case '>':
	strbuf_addstr(buf, ">");
	break;
	case '&':
	strbuf_addstr(buf, "&");
	break;
	case 0:
	return;
	}
	s++;
	}
	}

	static int is_rfc3986_reserved(char ch)
	{
	switch (ch) {
	case '!': case '*': case '\'': case '(': case ')': case ';':
	case ':': case '@': case '&': case '=': case '+': case '$':
	case ',': case '/': case '?': case '#': case '[': case ']':
	return 1;
	}
	return 0;
	}

	static int is_rfc3986_unreserved(char ch)
	{
	return isalnum(ch) \|\|
	ch == '-' \|\| ch == '_' \|\| ch == '.' \|\| ch == '~';
	}

	static void strbuf_add_urlencode(struct strbuf sb, const char s, size_t len,
	int reserved)
	{
	strbuf_grow(sb, len);
	while (len--) {
	char ch = *s++;
	if (is_rfc3986_unreserved(ch) \|\|
	(!reserved && is_rfc3986_reserved(ch)))
	strbuf_addch(sb, ch);
	else
	strbuf_addf(sb, "%%%02x", (unsigned char)ch);
	}
	}

	void strbuf_addstr_urlencode(struct strbuf sb, const char s,
	int reserved)
	{
	strbuf_add_urlencode(sb, s, strlen(s), reserved);
	}

	void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
	{
	if (bytes > 1 << 30) {
	strbuf_addf(buf, "%u.%2.2u GiB",
	(unsigned)(bytes >> 30),
	(unsigned)(bytes & ((1 << 30) - 1)) / 10737419);
	} else if (bytes > 1 << 20) {
	unsigned x = bytes + 5243; /* for rounding */
	strbuf_addf(buf, "%u.%2.2u MiB",
	x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
	} else if (bytes > 1 << 10) {
	unsigned x = bytes + 5; /* for rounding */
	strbuf_addf(buf, "%u.%2.2u KiB",
	x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
	} else {
	strbuf_addf(buf, "%u bytes", (unsigned)bytes);
	}
	}

	void strbuf_add_absolute_path(struct strbuf sb, const char path)
	{
	if (!*path)
	die("The empty string is not a valid path");
	if (!is_absolute_path(path)) {
	struct stat cwd_stat, pwd_stat;
	size_t orig_len = sb->len;
	char *cwd = xgetcwd();
	char *pwd = getenv("PWD");
	if (pwd && strcmp(pwd, cwd) &&
	!stat(cwd, &cwd_stat) &&
	(cwd_stat.st_dev \|\| cwd_stat.st_ino) &&
	!stat(pwd, &pwd_stat) &&
	pwd_stat.st_dev == cwd_stat.st_dev &&
	pwd_stat.st_ino == cwd_stat.st_ino)
	strbuf_addstr(sb, pwd);
	else
	strbuf_addstr(sb, cwd);
	if (sb->len > orig_len && !is_dir_sep(sb->buf[sb->len - 1]))
	strbuf_addch(sb, '/');
	free(cwd);
	}
	strbuf_addstr(sb, path);
	}

	void strbuf_add_real_path(struct strbuf sb, const char path)
	{
	if (sb->len) {
	struct strbuf resolved = STRBUF_INIT;
	strbuf_realpath(&resolved, path, 1);
	strbuf_addbuf(sb, &resolved);
	strbuf_release(&resolved);
	} else
	strbuf_realpath(sb, path, 1);
	}

	int printf_ln(const char *fmt, ...)
	{
	int ret;
	va_list ap;
	va_start(ap, fmt);
	ret = vprintf(fmt, ap);
	va_end(ap);
	if (ret < 0 \|\| putchar('\n') == EOF)
	return -1;
	return ret + 1;
	}

	int fprintf_ln(FILE fp, const char fmt, ...)
	{
	int ret;
	va_list ap;
	va_start(ap, fmt);
	ret = vfprintf(fp, fmt, ap);
	va_end(ap);
	if (ret < 0 \|\| putc('\n', fp) == EOF)
	return -1;
	return ret + 1;
	}

	char xstrdup_tolower(const char string)
	{
	char *result;
	size_t len, i;

	len = strlen(string);
	result = xmallocz(len);
	for (i = 0; i < len; i++)
	result[i] = tolower(string[i]);
	return result;
	}

	char xstrdup_toupper(const char string)
	{
	char *result;
	size_t len, i;

	len = strlen(string);
	result = xmallocz(len);
	for (i = 0; i < len; i++)
	result[i] = toupper(string[i]);
	return result;
	}

	char xstrvfmt(const char fmt, va_list ap)
	{
	struct strbuf buf = STRBUF_INIT;
	strbuf_vaddf(&buf, fmt, ap);
	return strbuf_detach(&buf, NULL);
	}

	char xstrfmt(const char fmt, ...)
	{
	va_list ap;
	char *ret;

	va_start(ap, fmt);
	ret = xstrvfmt(fmt, ap);
	va_end(ap);

	return ret;
	}

	void strbuf_addftime(struct strbuf sb, const char fmt, const struct tm *tm,
	int tz_offset, int suppress_tz_name)
	{
	struct strbuf munged_fmt = STRBUF_INIT;
	size_t hint = 128;
	size_t len;

	if (!*fmt)
	return;

	/*
	* There is no portable way to pass timezone information to
	* strftime, so we handle %z and %Z here.
	*/
	for (;;) {
	const char *percent = strchrnul(fmt, '%');
	strbuf_add(&munged_fmt, fmt, percent - fmt);
	if (!*percent)
	break;
	fmt = percent + 1;
	switch (*fmt) {
	case '%':
	strbuf_addstr(&munged_fmt, "%%");
	fmt++;
	break;
	case 'z':
	strbuf_addf(&munged_fmt, "%+05d", tz_offset);
	fmt++;
	break;
	case 'Z':
	if (suppress_tz_name) {
	fmt++;
	break;
	}
	/* FALLTHROUGH */
	default:
	strbuf_addch(&munged_fmt, '%');
	}
	}
	fmt = munged_fmt.buf;

	strbuf_grow(sb, hint);
	len = strftime(sb->buf + sb->len, sb->alloc - sb->len, fmt, tm);

	if (!len) {
	/*
	* strftime reports "0" if it could not fit the result in the buffer.
	* Unfortunately, it also reports "0" if the requested time string
	* takes 0 bytes. So our strategy is to munge the format so that the
	* output contains at least one character, and then drop the extra
	* character before returning.
	*/
	strbuf_addch(&munged_fmt, ' ');
	while (!len) {
	hint *= 2;
	strbuf_grow(sb, hint);
	len = strftime(sb->buf + sb->len, sb->alloc - sb->len,
	munged_fmt.buf, tm);
	}
	len--; /* drop munged space */
	}
	strbuf_release(&munged_fmt);
	strbuf_setlen(sb, sb->len + len);
	}

	void strbuf_add_unique_abbrev(struct strbuf sb, const struct object_id oid,
	int abbrev_len)
	{
	int r;
	strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
	r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
	strbuf_setlen(sb, sb->len + r);
	}

	/*
	* Returns the length of a line, without trailing spaces.
	*
	* If the line ends with newline, it will be removed too.
	*/
	static size_t cleanup(char *line, size_t len)
	{
	while (len) {
	unsigned char c = line[len - 1];
	if (!isspace(c))
	break;
	len--;
	}

	return len;
	}

	/*
	* Remove empty lines from the beginning and end
	* and also trailing spaces from every line.
	*
	* Turn multiple consecutive empty lines between paragraphs
	* into just one empty line.
	*
	* If the input has only empty lines and spaces,
	* no output will be produced.
	*
	* If last line does not have a newline at the end, one is added.
	*
	* Enable skip_comments to skip every line starting with comment
	* character.
	*/
	void strbuf_stripspace(struct strbuf *sb, int skip_comments)
	{
	size_t empties = 0;
	size_t i, j, len, newlen;
	char *eol;

	/* We may have to add a newline. */
	strbuf_grow(sb, 1);

	for (i = j = 0; i < sb->len; i += len, j += newlen) {
	eol = memchr(sb->buf + i, '\n', sb->len - i);
	len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;

	if (skip_comments && len && sb->buf[i] == comment_line_char) {
	newlen = 0;
	continue;
	}
	newlen = cleanup(sb->buf + i, len);

	/* Not just an empty line? */
	if (newlen) {
	if (empties > 0 && j > 0)
	sb->buf[j++] = '\n';
	empties = 0;
	memmove(sb->buf + j, sb->buf + i, newlen);
	sb->buf[newlen + j++] = '\n';
	} else {
	empties++;
	}
	}

	strbuf_setlen(sb, j);
	}

	int strbuf_normalize_path(struct strbuf *src)
	{
	struct strbuf dst = STRBUF_INIT;

	strbuf_grow(&dst, src->len);
	if (normalize_path_copy(dst.buf, src->buf) < 0) {
	strbuf_release(&dst);
	return -1;
	}

	/*
	* normalize_path does not tell us the new length, so we have to
	* compute it by looking for the new NUL it placed
	*/
	strbuf_setlen(&dst, strlen(dst.buf));
	strbuf_swap(src, &dst);
	strbuf_release(&dst);
	return 0;
	}

Nov	DEC	Jan
	08
2017	2018	2019

git/git

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