[thirdparty/git.git] / strbuf.c

#include "cache.h"
#include "refs.h"

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

int ends_with(const char *str, const char *suffix)
{
	int len = strlen(str), suflen = strlen(suffix);
	if (len < suflen)
		return 0;
	else
		return !strcmp(str + len - suflen, suffix);
}

/*
 * 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_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';
}

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_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)
{
	int 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, NULL, 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_adddup(struct strbuf *sb, size_t pos, size_t len)
{
	strbuf_grow(sb, len);
	memcpy(sb->buf + sb->len, sb->buf + pos, len);
	strbuf_setlen(sb, sb->len + len);
}

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') ? 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) {
		sprintf(prefix1, "%c ", comment_line_char);
		sprintf(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)
		die("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))
			die("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)
{
	int 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 cnt;

		cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
		if (cnt < 0) {
			if (oldalloc == 0)
				strbuf_release(sb);
			else
				strbuf_setlen(sb, oldlen);
			return -1;
		}
		if (!cnt)
			break;
		sb->len += cnt;
		strbuf_grow(sb, 8192);
	}

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

#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) {
		int 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_getwholeline(struct strbuf *sb, FILE *fp, int term)
{
	int ch;

	if (feof(fp))
		return EOF;

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

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

int strbuf_getline(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_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;
}

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

	fd = open(path, O_RDONLY);
	if (fd < 0)
		return -1;
	len = strbuf_read(sb, fd, hint);
	close(fd);
	if (len < 0)
		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, "&quot;");
			break;
		case '<':
			strbuf_addstr(buf, "&lt;");
			break;
		case '>':
			strbuf_addstr(buf, "&gt;");
			break;
		case '&':
			strbuf_addstr(buf, "&amp;");
			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", 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",
			    (int)(bytes >> 30),
			    (int)(bytes & ((1 << 30) - 1)) / 10737419);
	} else if (bytes > 1 << 20) {
		int 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) {
		int 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", (int)bytes);
	}
}

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;
}
Commit	Line	Data
812666c8	1	#include "cache.h"
a2fab531	2	#include "refs.h"
d1df5743	3
95662315 CC	4	int starts_with(const char str, const char prefix)
	5	{
	6	for (; ; str++, prefix++)
	7	if (!*prefix)
	8	return 1;
	9	else if (str != prefix)
	10	return 0;
	11	}
	12
95662315 CC	13	int ends_with(const char str, const char suffix)
	14	{
	15	int len = strlen(str), suflen = strlen(suffix);
	16	if (len < suflen)
	17	return 0;
	18	else
	19	return !strcmp(str + len - suflen, suffix);
	20	}
	21
b315c5c0 PH	22	/*
	23	* Used as the default ->buf value, so that people can always assume
	24	* buf is non NULL and ->buf is NUL terminated even for a freshly
	25	* initialized strbuf.
	26	*/
	27	char strbuf_slopbuf[1];
	28
917c9a71 PH	29	void strbuf_init(struct strbuf *sb, size_t hint)
917c9a71 PH	30	{
b315c5c0 PH	31	sb->alloc = sb->len = 0;
b315c5c0 PH	32	sb->buf = strbuf_slopbuf;
8c74ef1e	33	if (hint)
f1696ee3	34	strbuf_grow(sb, hint);
d1df5743 JH	35	}
d1df5743 JH	36
917c9a71 PH	37	void strbuf_release(struct strbuf *sb)
917c9a71 PH	38	{
b315c5c0 PH	39	if (sb->alloc) {
	40	free(sb->buf);
	41	strbuf_init(sb, 0);
	42	}
b449f4cf PH	43	}
b449f4cf PH	44
b315c5c0	45	char strbuf_detach(struct strbuf sb, size_t *sz)
917c9a71	46	{
08ad56f3 JK	47	char *res;
	48	strbuf_grow(sb, 0);
	49	res = sb->buf;
b315c5c0 PH	50	if (sz)
b315c5c0 PH	51	*sz = sb->len;
f1696ee3	52	strbuf_init(sb, 0);
b449f4cf PH	53	return res;
	54	}
	55
917c9a71 PH	56	void strbuf_attach(struct strbuf sb, void buf, size_t len, size_t alloc)
	57	{
	58	strbuf_release(sb);
	59	sb->buf = buf;
	60	sb->len = len;
	61	sb->alloc = alloc;
	62	strbuf_grow(sb, 0);
	63	sb->buf[sb->len] = '\0';
	64	}
	65
	66	void strbuf_grow(struct strbuf *sb, size_t extra)
	67	{
8c74ef1e	68	int new_buf = !sb->alloc;
1368f650 JN	69	if (unsigned_add_overflows(extra, 1) \|\|
1368f650 JN	70	unsigned_add_overflows(sb->len, extra + 1))
b449f4cf	71	die("you want to use way too much memory");
8c74ef1e	72	if (new_buf)
b315c5c0	73	sb->buf = NULL;
b449f4cf	74	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
8c74ef1e TR	75	if (new_buf)
8c74ef1e TR	76	sb->buf[0] = '\0';
b449f4cf PH	77	}
b449f4cf PH	78
eacd6dc5 LS	79	void strbuf_trim(struct strbuf *sb)
eacd6dc5 LS	80	{
3bb55e8a BG	81	strbuf_rtrim(sb);
3bb55e8a BG	82	strbuf_ltrim(sb);
eacd6dc5	83	}
f1696ee3 PH	84	void strbuf_rtrim(struct strbuf *sb)
	85	{
	86	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
	87	sb->len--;
	88	sb->buf[sb->len] = '\0';
	89	}
	90
eacd6dc5 LS	91	void strbuf_ltrim(struct strbuf *sb)
	92	{
	93	char *b = sb->buf;
	94	while (sb->len > 0 && isspace(*b)) {
	95	b++;
	96	sb->len--;
	97	}
	98	memmove(sb->buf, b, sb->len);
	99	sb->buf[sb->len] = '\0';
	100	}
	101
17b73dc6 MH	102	struct strbuf *strbuf_split_buf(const char str, size_t slen,
17b73dc6 MH	103	int terminator, int max)
eacd6dc5	104	{
b8c2c1fa MH	105	struct strbuf **ret = NULL;
b8c2c1fa MH	106	size_t nr = 0, alloc = 0;
eacd6dc5 LS	107	struct strbuf *t;
eacd6dc5 LS	108
1173bb33 MH	109	while (slen) {
	110	int len = slen;
	111	if (max <= 0 \|\| nr + 1 < max) {
17b73dc6	112	const char *end = memchr(str, terminator, slen);
1173bb33 MH	113	if (end)
	114	len = end - str + 1;
	115	}
eacd6dc5 LS	116	t = xmalloc(sizeof(struct strbuf));
eacd6dc5 LS	117	strbuf_init(t, len);
1173bb33	118	strbuf_add(t, str, len);
b8c2c1fa MH	119	ALLOC_GROW(ret, nr + 2, alloc);
b8c2c1fa MH	120	ret[nr++] = t;
1173bb33 MH	121	str += len;
1173bb33 MH	122	slen -= len;
eacd6dc5	123	}
b8c2c1fa MH	124	ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
b8c2c1fa MH	125	ret[nr] = NULL;
eacd6dc5 LS	126	return ret;
	127	}
	128
	129	void strbuf_list_free(struct strbuf **sbs)
	130	{
	131	struct strbuf **s = sbs;
	132
	133	while (*s) {
	134	strbuf_release(*s);
	135	free(*s++);
	136	}
	137	free(sbs);
	138	}
	139
9b200fd6	140	int strbuf_cmp(const struct strbuf a, const struct strbuf b)
45f66f64	141	{
8f024655 AR	142	int len = a->len < b->len ? a->len: b->len;
	143	int cmp = memcmp(a->buf, b->buf, len);
	144	if (cmp)
	145	return cmp;
	146	return a->len < b->len ? -1: a->len != b->len;
45f66f64 PH	147	}
45f66f64 PH	148
917c9a71 PH	149	void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
	150	const void *data, size_t dlen)
	151	{
1368f650	152	if (unsigned_add_overflows(pos, len))
917c9a71 PH	153	die("you want to use way too much memory");
	154	if (pos > sb->len)
	155	die("`pos' is too far after the end of the buffer");
	156	if (pos + len > sb->len)
	157	die("`pos + len' is too far after the end of the buffer");
	158
	159	if (dlen >= len)
	160	strbuf_grow(sb, dlen - len);
	161	memmove(sb->buf + pos + dlen,
	162	sb->buf + pos + len,
	163	sb->len - pos - len);
	164	memcpy(sb->buf + pos, data, dlen);
	165	strbuf_setlen(sb, sb->len + dlen - len);
	166	}
	167
c76689df PH	168	void strbuf_insert(struct strbuf sb, size_t pos, const void data, size_t len)
	169	{
	170	strbuf_splice(sb, pos, 0, data, len);
	171	}
	172
	173	void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
	174	{
	175	strbuf_splice(sb, pos, len, NULL, 0);
	176	}
	177
917c9a71 PH	178	void strbuf_add(struct strbuf sb, const void data, size_t len)
917c9a71 PH	179	{
b449f4cf PH	180	strbuf_grow(sb, len);
	181	memcpy(sb->buf + sb->len, data, len);
	182	strbuf_setlen(sb, sb->len + len);
	183	}
	184
91db267e RS	185	void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
	186	{
	187	strbuf_grow(sb, len);
	188	memcpy(sb->buf + sb->len, sb->buf + pos, len);
	189	strbuf_setlen(sb, sb->len + len);
	190	}
	191
917c9a71 PH	192	void strbuf_addf(struct strbuf sb, const char fmt, ...)
917c9a71 PH	193	{
b449f4cf	194	va_list ap;
ebeb6090 JK	195	va_start(ap, fmt);
	196	strbuf_vaddf(sb, fmt, ap);
	197	va_end(ap);
	198	}
	199
eff80a9f JH	200	static void add_lines(struct strbuf *out,
	201	const char *prefix1,
	202	const char *prefix2,
	203	const char *buf, size_t size)
	204	{
	205	while (size) {
	206	const char *prefix;
	207	const char *next = memchr(buf, '\n', size);
	208	next = next ? (next + 1) : (buf + size);
	209
	210	prefix = (prefix2 && buf[0] == '\n') ? prefix2 : prefix1;
	211	strbuf_addstr(out, prefix);
	212	strbuf_add(out, buf, next - buf);
	213	size -= next - buf;
	214	buf = next;
	215	}
	216	strbuf_complete_line(out);
	217	}
	218
	219	void strbuf_add_commented_lines(struct strbuf out, const char buf, size_t size)
	220	{
	221	static char prefix1[3];
	222	static char prefix2[2];
	223
	224	if (prefix1[0] != comment_line_char) {
	225	sprintf(prefix1, "%c ", comment_line_char);
	226	sprintf(prefix2, "%c", comment_line_char);
	227	}
	228	add_lines(out, prefix1, prefix2, buf, size);
	229	}
	230
	231	void strbuf_commented_addf(struct strbuf sb, const char fmt, ...)
	232	{
	233	va_list params;
	234	struct strbuf buf = STRBUF_INIT;
	235	int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
	236
	237	va_start(params, fmt);
	238	strbuf_vaddf(&buf, fmt, params);
	239	va_end(params);
	240
	241	strbuf_add_commented_lines(sb, buf.buf, buf.len);
	242	if (incomplete_line)
	243	sb->buf[--sb->len] = '\0';
	244
	245	strbuf_release(&buf);
	246	}
	247
ebeb6090 JK	248	void strbuf_vaddf(struct strbuf sb, const char fmt, va_list ap)
	249	{
	250	int len;
	251	va_list cp;
b449f4cf	252
f141bd80 SP	253	if (!strbuf_avail(sb))
f141bd80 SP	254	strbuf_grow(sb, 64);
ebeb6090 JK	255	va_copy(cp, ap);
	256	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
	257	va_end(cp);
f141bd80	258	if (len < 0)
ebeb6090	259	die("BUG: your vsnprintf is broken (returned %d)", len);
f1696ee3	260	if (len > strbuf_avail(sb)) {
b449f4cf	261	strbuf_grow(sb, len);
b449f4cf	262	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
ebeb6090 JK	263	if (len > strbuf_avail(sb))
ebeb6090 JK	264	die("BUG: your vsnprintf is broken (insatiable)");
b449f4cf PH	265	}
b449f4cf PH	266	strbuf_setlen(sb, sb->len + len);
d1df5743 JH	267	}
d1df5743 JH	268
c3a670de MC	269	void strbuf_expand(struct strbuf sb, const char format, expand_fn_t fn,
c3a670de MC	270	void *context)
cde75e59 RS	271	{
cde75e59 RS	272	for (;;) {
c3a670de MC	273	const char *percent;
c3a670de MC	274	size_t consumed;
cde75e59 RS	275
	276	percent = strchrnul(format, '%');
	277	strbuf_add(sb, format, percent - format);
	278	if (!*percent)
	279	break;
	280	format = percent + 1;
	281
0a0416a3 JK	282	if (*format == '%') {
	283	strbuf_addch(sb, '%');
	284	format++;
	285	continue;
	286	}
	287
c3a670de MC	288	consumed = fn(sb, format, context);
	289	if (consumed)
	290	format += consumed;
	291	else
cde75e59 RS	292	strbuf_addch(sb, '%');
	293	}
	294	}
	295
9b864e73 RS	296	size_t strbuf_expand_dict_cb(struct strbuf sb, const char placeholder,
	297	void *context)
	298	{
	299	struct strbuf_expand_dict_entry *e = context;
	300	size_t len;
	301
	302	for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
	303	if (!strncmp(placeholder, e->placeholder, len)) {
	304	if (e->value)
	305	strbuf_addstr(sb, e->value);
	306	return len;
	307	}
	308	}
	309	return 0;
	310	}
	311
361df5df JK	312	void strbuf_addbuf_percentquote(struct strbuf dst, const struct strbuf src)
	313	{
	314	int i, len = src->len;
	315
	316	for (i = 0; i < len; i++) {
	317	if (src->buf[i] == '%')
	318	strbuf_addch(dst, '%');
	319	strbuf_addch(dst, src->buf[i]);
	320	}
	321	}
	322
917c9a71 PH	323	size_t strbuf_fread(struct strbuf sb, size_t size, FILE f)
917c9a71 PH	324	{
b449f4cf	325	size_t res;
2fc64700	326	size_t oldalloc = sb->alloc;
b449f4cf PH	327
	328	strbuf_grow(sb, size);
	329	res = fread(sb->buf + sb->len, 1, size, f);
2fc64700	330	if (res > 0)
b449f4cf	331	strbuf_setlen(sb, sb->len + res);
6651c3f7	332	else if (oldalloc == 0)
2fc64700	333	strbuf_release(sb);
b449f4cf	334	return res;
d1df5743 JH	335	}
d1df5743 JH	336
f1696ee3	337	ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
b449f4cf PH	338	{
b449f4cf PH	339	size_t oldlen = sb->len;
2fc64700	340	size_t oldalloc = sb->alloc;
b449f4cf	341
f1696ee3	342	strbuf_grow(sb, hint ? hint : 8192);
b449f4cf PH	343	for (;;) {
	344	ssize_t cnt;
	345
b449f4cf PH	346	cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
b449f4cf PH	347	if (cnt < 0) {
2fc64700 RS	348	if (oldalloc == 0)
	349	strbuf_release(sb);
	350	else
	351	strbuf_setlen(sb, oldlen);
b449f4cf PH	352	return -1;
	353	}
	354	if (!cnt)
	355	break;
	356	sb->len += cnt;
f1696ee3	357	strbuf_grow(sb, 8192);
b449f4cf PH	358	}
	359
	360	sb->buf[sb->len] = '\0';
	361	return sb->len - oldlen;
d1df5743 JH	362	}
d1df5743 JH	363
b11b7e13 LT	364	#define STRBUF_MAXLINK (2*PATH_MAX)
	365
	366	int strbuf_readlink(struct strbuf sb, const char path, size_t hint)
	367	{
2fc64700 RS	368	size_t oldalloc = sb->alloc;
2fc64700 RS	369
b11b7e13 LT	370	if (hint < 32)
	371	hint = 32;
	372
	373	while (hint < STRBUF_MAXLINK) {
	374	int len;
	375
	376	strbuf_grow(sb, hint);
	377	len = readlink(path, sb->buf, hint);
	378	if (len < 0) {
	379	if (errno != ERANGE)
	380	break;
	381	} else if (len < hint) {
	382	strbuf_setlen(sb, len);
	383	return 0;
	384	}
	385
	386	/* .. the buffer was too small - try again */
	387	hint *= 2;
	388	}
2fc64700 RS	389	if (oldalloc == 0)
2fc64700 RS	390	strbuf_release(sb);
b11b7e13 LT	391	return -1;
	392	}
	393
c7e4f0d7	394	int strbuf_getwholeline(struct strbuf sb, FILE fp, int term)
917c9a71	395	{
d1df5743	396	int ch;
e6c019d0	397
e6c019d0 PH	398	if (feof(fp))
e6c019d0 PH	399	return EOF;
b449f4cf PH	400
b449f4cf PH	401	strbuf_reset(sb);
d1df5743	402	while ((ch = fgetc(fp)) != EOF) {
b449f4cf PH	403	strbuf_grow(sb, 1);
b449f4cf PH	404	sb->buf[sb->len++] = ch;
c7e4f0d7 BC	405	if (ch == term)
c7e4f0d7 BC	406	break;
d1df5743	407	}
e6c019d0 PH	408	if (ch == EOF && sb->len == 0)
e6c019d0 PH	409	return EOF;
b449f4cf	410
b449f4cf	411	sb->buf[sb->len] = '\0';
e6c019d0	412	return 0;
d1df5743	413	}
a9390b9f	414
c7e4f0d7 BC	415	int strbuf_getline(struct strbuf sb, FILE fp, int term)
	416	{
	417	if (strbuf_getwholeline(sb, fp, term))
	418	return EOF;
	419	if (sb->buf[sb->len-1] == term)
	420	strbuf_setlen(sb, sb->len-1);
	421	return 0;
	422	}
	423
5e8617f5 TR	424	int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
	425	{
	426	strbuf_reset(sb);
	427
	428	while (1) {
	429	char ch;
	430	ssize_t len = xread(fd, &ch, 1);
	431	if (len <= 0)
	432	return EOF;
	433	strbuf_addch(sb, ch);
	434	if (ch == term)
	435	break;
	436	}
	437	return 0;
	438	}
	439
387e7e19	440	int strbuf_read_file(struct strbuf sb, const char path, size_t hint)
a9390b9f KH	441	{
	442	int fd, len;
	443
	444	fd = open(path, O_RDONLY);
	445	if (fd < 0)
	446	return -1;
387e7e19	447	len = strbuf_read(sb, fd, hint);
a9390b9f KH	448	close(fd);
	449	if (len < 0)
	450	return -1;
	451
	452	return len;
	453	}
895680f0 JH	454
	455	void strbuf_add_lines(struct strbuf out, const char prefix,
	456	const char *buf, size_t size)
	457	{
eff80a9f	458	add_lines(out, prefix, NULL, buf, size);
895680f0	459	}
367d20ec	460
5963c036 MH	461	void strbuf_addstr_xml_quoted(struct strbuf buf, const char s)
	462	{
	463	while (*s) {
	464	size_t len = strcspn(s, "\"<>&");
	465	strbuf_add(buf, s, len);
	466	s += len;
	467	switch (*s) {
	468	case '"':
	469	strbuf_addstr(buf, """);
	470	break;
	471	case '<':
	472	strbuf_addstr(buf, "<");
	473	break;
	474	case '>':
	475	strbuf_addstr(buf, ">");
	476	break;
	477	case '&':
	478	strbuf_addstr(buf, "&");
	479	break;
	480	case 0:
	481	return;
	482	}
	483	s++;
	484	}
	485	}
	486
c505116b JK	487	static int is_rfc3986_reserved(char ch)
	488	{
	489	switch (ch) {
	490	case '!': case '*': case '\'': case '(': case ')': case ';':
	491	case ':': case '@': case '&': case '=': case '+': case '$':
	492	case ',': case '/': case '?': case '#': case '[': case ']':
	493	return 1;
	494	}
	495	return 0;
	496	}
	497
	498	static int is_rfc3986_unreserved(char ch)
	499	{
	500	return isalnum(ch) \|\|
	501	ch == '-' \|\| ch == '_' \|\| ch == '.' \|\| ch == '~';
	502	}
	503
ea03a8e1 JH	504	static void strbuf_add_urlencode(struct strbuf sb, const char s, size_t len,
ea03a8e1 JH	505	int reserved)
c505116b JK	506	{
	507	strbuf_grow(sb, len);
	508	while (len--) {
	509	char ch = *s++;
	510	if (is_rfc3986_unreserved(ch) \|\|
	511	(!reserved && is_rfc3986_reserved(ch)))
	512	strbuf_addch(sb, ch);
	513	else
	514	strbuf_addf(sb, "%%%02x", ch);
	515	}
	516	}
	517
	518	void strbuf_addstr_urlencode(struct strbuf sb, const char s,
	519	int reserved)
	520	{
	521	strbuf_add_urlencode(sb, s, strlen(s), reserved);
	522	}
9a0a30aa	523
079b546a AP	524	void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
	525	{
	526	if (bytes > 1 << 30) {
	527	strbuf_addf(buf, "%u.%2.2u GiB",
	528	(int)(bytes >> 30),
	529	(int)(bytes & ((1 << 30) - 1)) / 10737419);
	530	} else if (bytes > 1 << 20) {
	531	int x = bytes + 5243; /* for rounding */
	532	strbuf_addf(buf, "%u.%2.2u MiB",
	533	x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
	534	} else if (bytes > 1 << 10) {
	535	int x = bytes + 5; /* for rounding */
	536	strbuf_addf(buf, "%u.%2.2u KiB",
	537	x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
	538	} else {
	539	strbuf_addf(buf, "%u bytes", (int)bytes);
	540	}
	541	}
	542
9a0a30aa NTND	543	int printf_ln(const char *fmt, ...)
	544	{
	545	int ret;
	546	va_list ap;
	547	va_start(ap, fmt);
	548	ret = vprintf(fmt, ap);
	549	va_end(ap);
	550	if (ret < 0 \|\| putchar('\n') == EOF)
	551	return -1;
	552	return ret + 1;
	553	}
	554
	555	int fprintf_ln(FILE fp, const char fmt, ...)
	556	{
	557	int ret;
	558	va_list ap;
	559	va_start(ap, fmt);
	560	ret = vfprintf(fp, fmt, ap);
	561	va_end(ap);
	562	if (ret < 0 \|\| putc('\n', fp) == EOF)
	563	return -1;
	564	return ret + 1;
	565	}