[thirdparty/git.git] / strbuf.c

#include "cache.h"
#include "refs.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 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';
}

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

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

	len = strlen(string);
	result = xmalloc(len + 1);
	for (i = 0; i < len; i++)
		result[i] = tolower(string[i]);
	result[i] = '\0';
	return result;
}
Commit	Line	Data
812666c8	1	#include "cache.h"
a2fab531	2	#include "refs.h"
d4241f52	3	#include "utf8.h"
d1df5743	4
95662315 CC	5	int starts_with(const char str, const char prefix)
	6	{
	7	for (; ; str++, prefix++)
	8	if (!*prefix)
	9	return 1;
	10	else if (str != prefix)
	11	return 0;
	12	}
	13
95662315 CC	14	int ends_with(const char str, const char suffix)
	15	{
	16	int len = strlen(str), suflen = strlen(suffix);
	17	if (len < suflen)
	18	return 0;
	19	else
	20	return !strcmp(str + len - suflen, suffix);
	21	}
	22
b315c5c0 PH	23	/*
	24	* Used as the default ->buf value, so that people can always assume
	25	* buf is non NULL and ->buf is NUL terminated even for a freshly
	26	* initialized strbuf.
	27	*/
	28	char strbuf_slopbuf[1];
	29
917c9a71 PH	30	void strbuf_init(struct strbuf *sb, size_t hint)
917c9a71 PH	31	{
b315c5c0 PH	32	sb->alloc = sb->len = 0;
b315c5c0 PH	33	sb->buf = strbuf_slopbuf;
8c74ef1e	34	if (hint)
f1696ee3	35	strbuf_grow(sb, hint);
d1df5743 JH	36	}
d1df5743 JH	37
917c9a71 PH	38	void strbuf_release(struct strbuf *sb)
917c9a71 PH	39	{
b315c5c0 PH	40	if (sb->alloc) {
	41	free(sb->buf);
	42	strbuf_init(sb, 0);
	43	}
b449f4cf PH	44	}
b449f4cf PH	45
b315c5c0	46	char strbuf_detach(struct strbuf sb, size_t *sz)
917c9a71	47	{
08ad56f3 JK	48	char *res;
	49	strbuf_grow(sb, 0);
	50	res = sb->buf;
b315c5c0 PH	51	if (sz)
b315c5c0 PH	52	*sz = sb->len;
f1696ee3	53	strbuf_init(sb, 0);
b449f4cf PH	54	return res;
	55	}
	56
917c9a71 PH	57	void strbuf_attach(struct strbuf sb, void buf, size_t len, size_t alloc)
	58	{
	59	strbuf_release(sb);
	60	sb->buf = buf;
	61	sb->len = len;
	62	sb->alloc = alloc;
	63	strbuf_grow(sb, 0);
	64	sb->buf[sb->len] = '\0';
	65	}
	66
	67	void strbuf_grow(struct strbuf *sb, size_t extra)
	68	{
8c74ef1e	69	int new_buf = !sb->alloc;
1368f650 JN	70	if (unsigned_add_overflows(extra, 1) \|\|
1368f650 JN	71	unsigned_add_overflows(sb->len, extra + 1))
b449f4cf	72	die("you want to use way too much memory");
8c74ef1e	73	if (new_buf)
b315c5c0	74	sb->buf = NULL;
b449f4cf	75	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
8c74ef1e TR	76	if (new_buf)
8c74ef1e TR	77	sb->buf[0] = '\0';
b449f4cf PH	78	}
b449f4cf PH	79
eacd6dc5 LS	80	void strbuf_trim(struct strbuf *sb)
eacd6dc5 LS	81	{
3bb55e8a BG	82	strbuf_rtrim(sb);
3bb55e8a BG	83	strbuf_ltrim(sb);
eacd6dc5	84	}
f1696ee3 PH	85	void strbuf_rtrim(struct strbuf *sb)
	86	{
	87	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
	88	sb->len--;
	89	sb->buf[sb->len] = '\0';
	90	}
	91
eacd6dc5 LS	92	void strbuf_ltrim(struct strbuf *sb)
	93	{
	94	char *b = sb->buf;
	95	while (sb->len > 0 && isspace(*b)) {
	96	b++;
	97	sb->len--;
	98	}
	99	memmove(sb->buf, b, sb->len);
	100	sb->buf[sb->len] = '\0';
	101	}
	102
d4241f52 JK	103	int strbuf_reencode(struct strbuf sb, const char from, const char *to)
	104	{
	105	char *out;
	106	int len;
	107
	108	if (same_encoding(from, to))
	109	return 0;
	110
	111	out = reencode_string_len(sb->buf, sb->len, to, from, &len);
	112	if (!out)
	113	return -1;
	114
	115	strbuf_attach(sb, out, len, len);
	116	return 0;
	117	}
	118
ffb20ce1 JK	119	void strbuf_tolower(struct strbuf *sb)
	120	{
	121	char p = sb->buf, end = sb->buf + sb->len;
	122	for (; p < end; p++)
	123	p = tolower(p);
	124	}
	125
17b73dc6 MH	126	struct strbuf *strbuf_split_buf(const char str, size_t slen,
17b73dc6 MH	127	int terminator, int max)
eacd6dc5	128	{
b8c2c1fa MH	129	struct strbuf **ret = NULL;
b8c2c1fa MH	130	size_t nr = 0, alloc = 0;
eacd6dc5 LS	131	struct strbuf *t;
eacd6dc5 LS	132
1173bb33 MH	133	while (slen) {
	134	int len = slen;
	135	if (max <= 0 \|\| nr + 1 < max) {
17b73dc6	136	const char *end = memchr(str, terminator, slen);
1173bb33 MH	137	if (end)
	138	len = end - str + 1;
	139	}
eacd6dc5 LS	140	t = xmalloc(sizeof(struct strbuf));
eacd6dc5 LS	141	strbuf_init(t, len);
1173bb33	142	strbuf_add(t, str, len);
b8c2c1fa MH	143	ALLOC_GROW(ret, nr + 2, alloc);
b8c2c1fa MH	144	ret[nr++] = t;
1173bb33 MH	145	str += len;
1173bb33 MH	146	slen -= len;
eacd6dc5	147	}
b8c2c1fa MH	148	ALLOC_GROW(ret, nr + 1, alloc); /* In case string was empty */
b8c2c1fa MH	149	ret[nr] = NULL;
eacd6dc5 LS	150	return ret;
	151	}
	152
	153	void strbuf_list_free(struct strbuf **sbs)
	154	{
	155	struct strbuf **s = sbs;
	156
	157	while (*s) {
	158	strbuf_release(*s);
	159	free(*s++);
	160	}
	161	free(sbs);
	162	}
	163
9b200fd6	164	int strbuf_cmp(const struct strbuf a, const struct strbuf b)
45f66f64	165	{
8f024655 AR	166	int len = a->len < b->len ? a->len: b->len;
	167	int cmp = memcmp(a->buf, b->buf, len);
	168	if (cmp)
	169	return cmp;
	170	return a->len < b->len ? -1: a->len != b->len;
45f66f64 PH	171	}
45f66f64 PH	172
917c9a71 PH	173	void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
	174	const void *data, size_t dlen)
	175	{
1368f650	176	if (unsigned_add_overflows(pos, len))
917c9a71 PH	177	die("you want to use way too much memory");
	178	if (pos > sb->len)
	179	die("`pos' is too far after the end of the buffer");
	180	if (pos + len > sb->len)
	181	die("`pos + len' is too far after the end of the buffer");
	182
	183	if (dlen >= len)
	184	strbuf_grow(sb, dlen - len);
	185	memmove(sb->buf + pos + dlen,
	186	sb->buf + pos + len,
	187	sb->len - pos - len);
	188	memcpy(sb->buf + pos, data, dlen);
	189	strbuf_setlen(sb, sb->len + dlen - len);
	190	}
	191
c76689df PH	192	void strbuf_insert(struct strbuf sb, size_t pos, const void data, size_t len)
	193	{
	194	strbuf_splice(sb, pos, 0, data, len);
	195	}
	196
	197	void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
	198	{
	199	strbuf_splice(sb, pos, len, NULL, 0);
	200	}
	201
917c9a71 PH	202	void strbuf_add(struct strbuf sb, const void data, size_t len)
917c9a71 PH	203	{
b449f4cf PH	204	strbuf_grow(sb, len);
	205	memcpy(sb->buf + sb->len, data, len);
	206	strbuf_setlen(sb, sb->len + len);
	207	}
	208
91db267e RS	209	void strbuf_adddup(struct strbuf *sb, size_t pos, size_t len)
	210	{
	211	strbuf_grow(sb, len);
	212	memcpy(sb->buf + sb->len, sb->buf + pos, len);
	213	strbuf_setlen(sb, sb->len + len);
	214	}
	215
917c9a71 PH	216	void strbuf_addf(struct strbuf sb, const char fmt, ...)
917c9a71 PH	217	{
b449f4cf	218	va_list ap;
ebeb6090 JK	219	va_start(ap, fmt);
	220	strbuf_vaddf(sb, fmt, ap);
	221	va_end(ap);
	222	}
	223
eff80a9f JH	224	static void add_lines(struct strbuf *out,
	225	const char *prefix1,
	226	const char *prefix2,
	227	const char *buf, size_t size)
	228	{
	229	while (size) {
	230	const char *prefix;
	231	const char *next = memchr(buf, '\n', size);
	232	next = next ? (next + 1) : (buf + size);
	233
	234	prefix = (prefix2 && buf[0] == '\n') ? prefix2 : prefix1;
	235	strbuf_addstr(out, prefix);
	236	strbuf_add(out, buf, next - buf);
	237	size -= next - buf;
	238	buf = next;
	239	}
	240	strbuf_complete_line(out);
	241	}
	242
	243	void strbuf_add_commented_lines(struct strbuf out, const char buf, size_t size)
	244	{
	245	static char prefix1[3];
	246	static char prefix2[2];
	247
	248	if (prefix1[0] != comment_line_char) {
	249	sprintf(prefix1, "%c ", comment_line_char);
	250	sprintf(prefix2, "%c", comment_line_char);
	251	}
	252	add_lines(out, prefix1, prefix2, buf, size);
	253	}
	254
	255	void strbuf_commented_addf(struct strbuf sb, const char fmt, ...)
	256	{
	257	va_list params;
	258	struct strbuf buf = STRBUF_INIT;
	259	int incomplete_line = sb->len && sb->buf[sb->len - 1] != '\n';
	260
	261	va_start(params, fmt);
	262	strbuf_vaddf(&buf, fmt, params);
	263	va_end(params);
	264
	265	strbuf_add_commented_lines(sb, buf.buf, buf.len);
	266	if (incomplete_line)
	267	sb->buf[--sb->len] = '\0';
	268
	269	strbuf_release(&buf);
	270	}
	271
ebeb6090 JK	272	void strbuf_vaddf(struct strbuf sb, const char fmt, va_list ap)
	273	{
	274	int len;
	275	va_list cp;
b449f4cf	276
f141bd80 SP	277	if (!strbuf_avail(sb))
f141bd80 SP	278	strbuf_grow(sb, 64);
ebeb6090 JK	279	va_copy(cp, ap);
	280	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, cp);
	281	va_end(cp);
f141bd80	282	if (len < 0)
ebeb6090	283	die("BUG: your vsnprintf is broken (returned %d)", len);
f1696ee3	284	if (len > strbuf_avail(sb)) {
b449f4cf	285	strbuf_grow(sb, len);
b449f4cf	286	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
ebeb6090 JK	287	if (len > strbuf_avail(sb))
ebeb6090 JK	288	die("BUG: your vsnprintf is broken (insatiable)");
b449f4cf PH	289	}
b449f4cf PH	290	strbuf_setlen(sb, sb->len + len);
d1df5743 JH	291	}
d1df5743 JH	292
c3a670de MC	293	void strbuf_expand(struct strbuf sb, const char format, expand_fn_t fn,
c3a670de MC	294	void *context)
cde75e59 RS	295	{
cde75e59 RS	296	for (;;) {
c3a670de MC	297	const char *percent;
c3a670de MC	298	size_t consumed;
cde75e59 RS	299
	300	percent = strchrnul(format, '%');
	301	strbuf_add(sb, format, percent - format);
	302	if (!*percent)
	303	break;
	304	format = percent + 1;
	305
0a0416a3 JK	306	if (*format == '%') {
	307	strbuf_addch(sb, '%');
	308	format++;
	309	continue;
	310	}
	311
c3a670de MC	312	consumed = fn(sb, format, context);
	313	if (consumed)
	314	format += consumed;
	315	else
cde75e59 RS	316	strbuf_addch(sb, '%');
	317	}
	318	}
	319
9b864e73 RS	320	size_t strbuf_expand_dict_cb(struct strbuf sb, const char placeholder,
	321	void *context)
	322	{
	323	struct strbuf_expand_dict_entry *e = context;
	324	size_t len;
	325
	326	for (; e->placeholder && (len = strlen(e->placeholder)); e++) {
	327	if (!strncmp(placeholder, e->placeholder, len)) {
	328	if (e->value)
	329	strbuf_addstr(sb, e->value);
	330	return len;
	331	}
	332	}
	333	return 0;
	334	}
	335
361df5df JK	336	void strbuf_addbuf_percentquote(struct strbuf dst, const struct strbuf src)
	337	{
	338	int i, len = src->len;
	339
	340	for (i = 0; i < len; i++) {
	341	if (src->buf[i] == '%')
	342	strbuf_addch(dst, '%');
	343	strbuf_addch(dst, src->buf[i]);
	344	}
	345	}
	346
917c9a71 PH	347	size_t strbuf_fread(struct strbuf sb, size_t size, FILE f)
917c9a71 PH	348	{
b449f4cf	349	size_t res;
2fc64700	350	size_t oldalloc = sb->alloc;
b449f4cf PH	351
	352	strbuf_grow(sb, size);
	353	res = fread(sb->buf + sb->len, 1, size, f);
2fc64700	354	if (res > 0)
b449f4cf	355	strbuf_setlen(sb, sb->len + res);
6651c3f7	356	else if (oldalloc == 0)
2fc64700	357	strbuf_release(sb);
b449f4cf	358	return res;
d1df5743 JH	359	}
d1df5743 JH	360
f1696ee3	361	ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
b449f4cf PH	362	{
b449f4cf PH	363	size_t oldlen = sb->len;
2fc64700	364	size_t oldalloc = sb->alloc;
b449f4cf	365
f1696ee3	366	strbuf_grow(sb, hint ? hint : 8192);
b449f4cf PH	367	for (;;) {
	368	ssize_t cnt;
	369
b449f4cf PH	370	cnt = xread(fd, sb->buf + sb->len, sb->alloc - sb->len - 1);
b449f4cf PH	371	if (cnt < 0) {
2fc64700 RS	372	if (oldalloc == 0)
	373	strbuf_release(sb);
	374	else
	375	strbuf_setlen(sb, oldlen);
b449f4cf PH	376	return -1;
	377	}
	378	if (!cnt)
	379	break;
	380	sb->len += cnt;
f1696ee3	381	strbuf_grow(sb, 8192);
b449f4cf PH	382	}
	383
	384	sb->buf[sb->len] = '\0';
	385	return sb->len - oldlen;
d1df5743 JH	386	}
d1df5743 JH	387
b11b7e13 LT	388	#define STRBUF_MAXLINK (2*PATH_MAX)
	389
	390	int strbuf_readlink(struct strbuf sb, const char path, size_t hint)
	391	{
2fc64700 RS	392	size_t oldalloc = sb->alloc;
2fc64700 RS	393
b11b7e13 LT	394	if (hint < 32)
	395	hint = 32;
	396
	397	while (hint < STRBUF_MAXLINK) {
	398	int len;
	399
	400	strbuf_grow(sb, hint);
	401	len = readlink(path, sb->buf, hint);
	402	if (len < 0) {
	403	if (errno != ERANGE)
	404	break;
	405	} else if (len < hint) {
	406	strbuf_setlen(sb, len);
	407	return 0;
	408	}
	409
	410	/* .. the buffer was too small - try again */
	411	hint *= 2;
	412	}
2fc64700 RS	413	if (oldalloc == 0)
2fc64700 RS	414	strbuf_release(sb);
b11b7e13 LT	415	return -1;
	416	}
	417
c7e4f0d7	418	int strbuf_getwholeline(struct strbuf sb, FILE fp, int term)
917c9a71	419	{
d1df5743	420	int ch;
e6c019d0	421
e6c019d0 PH	422	if (feof(fp))
e6c019d0 PH	423	return EOF;
b449f4cf PH	424
b449f4cf PH	425	strbuf_reset(sb);
d1df5743	426	while ((ch = fgetc(fp)) != EOF) {
b449f4cf PH	427	strbuf_grow(sb, 1);
b449f4cf PH	428	sb->buf[sb->len++] = ch;
c7e4f0d7 BC	429	if (ch == term)
c7e4f0d7 BC	430	break;
d1df5743	431	}
e6c019d0 PH	432	if (ch == EOF && sb->len == 0)
e6c019d0 PH	433	return EOF;
b449f4cf	434
b449f4cf	435	sb->buf[sb->len] = '\0';
e6c019d0	436	return 0;
d1df5743	437	}
a9390b9f	438
c7e4f0d7 BC	439	int strbuf_getline(struct strbuf sb, FILE fp, int term)
	440	{
	441	if (strbuf_getwholeline(sb, fp, term))
	442	return EOF;
	443	if (sb->buf[sb->len-1] == term)
	444	strbuf_setlen(sb, sb->len-1);
	445	return 0;
	446	}
	447
5e8617f5 TR	448	int strbuf_getwholeline_fd(struct strbuf *sb, int fd, int term)
	449	{
	450	strbuf_reset(sb);
	451
	452	while (1) {
	453	char ch;
	454	ssize_t len = xread(fd, &ch, 1);
	455	if (len <= 0)
	456	return EOF;
	457	strbuf_addch(sb, ch);
	458	if (ch == term)
	459	break;
	460	}
	461	return 0;
	462	}
	463
387e7e19	464	int strbuf_read_file(struct strbuf sb, const char path, size_t hint)
a9390b9f KH	465	{
	466	int fd, len;
	467
	468	fd = open(path, O_RDONLY);
	469	if (fd < 0)
	470	return -1;
387e7e19	471	len = strbuf_read(sb, fd, hint);
a9390b9f KH	472	close(fd);
	473	if (len < 0)
	474	return -1;
	475
	476	return len;
	477	}
895680f0 JH	478
	479	void strbuf_add_lines(struct strbuf out, const char prefix,
	480	const char *buf, size_t size)
	481	{
eff80a9f	482	add_lines(out, prefix, NULL, buf, size);
895680f0	483	}
367d20ec	484
5963c036 MH	485	void strbuf_addstr_xml_quoted(struct strbuf buf, const char s)
	486	{
	487	while (*s) {
	488	size_t len = strcspn(s, "\"<>&");
	489	strbuf_add(buf, s, len);
	490	s += len;
	491	switch (*s) {
	492	case '"':
	493	strbuf_addstr(buf, """);
	494	break;
	495	case '<':
	496	strbuf_addstr(buf, "<");
	497	break;
	498	case '>':
	499	strbuf_addstr(buf, ">");
	500	break;
	501	case '&':
	502	strbuf_addstr(buf, "&");
	503	break;
	504	case 0:
	505	return;
	506	}
	507	s++;
	508	}
	509	}
	510
c505116b JK	511	static int is_rfc3986_reserved(char ch)
	512	{
	513	switch (ch) {
	514	case '!': case '*': case '\'': case '(': case ')': case ';':
	515	case ':': case '@': case '&': case '=': case '+': case '$':
	516	case ',': case '/': case '?': case '#': case '[': case ']':
	517	return 1;
	518	}
	519	return 0;
	520	}
	521
	522	static int is_rfc3986_unreserved(char ch)
	523	{
	524	return isalnum(ch) \|\|
	525	ch == '-' \|\| ch == '_' \|\| ch == '.' \|\| ch == '~';
	526	}
	527
ea03a8e1 JH	528	static void strbuf_add_urlencode(struct strbuf sb, const char s, size_t len,
ea03a8e1 JH	529	int reserved)
c505116b JK	530	{
	531	strbuf_grow(sb, len);
	532	while (len--) {
	533	char ch = *s++;
	534	if (is_rfc3986_unreserved(ch) \|\|
	535	(!reserved && is_rfc3986_reserved(ch)))
	536	strbuf_addch(sb, ch);
	537	else
	538	strbuf_addf(sb, "%%%02x", ch);
	539	}
	540	}
	541
	542	void strbuf_addstr_urlencode(struct strbuf sb, const char s,
	543	int reserved)
	544	{
	545	strbuf_add_urlencode(sb, s, strlen(s), reserved);
	546	}
9a0a30aa	547
079b546a AP	548	void strbuf_humanise_bytes(struct strbuf *buf, off_t bytes)
	549	{
	550	if (bytes > 1 << 30) {
	551	strbuf_addf(buf, "%u.%2.2u GiB",
	552	(int)(bytes >> 30),
	553	(int)(bytes & ((1 << 30) - 1)) / 10737419);
	554	} else if (bytes > 1 << 20) {
	555	int x = bytes + 5243; /* for rounding */
	556	strbuf_addf(buf, "%u.%2.2u MiB",
	557	x >> 20, ((x & ((1 << 20) - 1)) * 100) >> 20);
	558	} else if (bytes > 1 << 10) {
	559	int x = bytes + 5; /* for rounding */
	560	strbuf_addf(buf, "%u.%2.2u KiB",
	561	x >> 10, ((x & ((1 << 10) - 1)) * 100) >> 10);
	562	} else {
	563	strbuf_addf(buf, "%u bytes", (int)bytes);
	564	}
	565	}
	566
9a0a30aa NTND	567	int printf_ln(const char *fmt, ...)
	568	{
	569	int ret;
	570	va_list ap;
	571	va_start(ap, fmt);
	572	ret = vprintf(fmt, ap);
	573	va_end(ap);
	574	if (ret < 0 \|\| putchar('\n') == EOF)
	575	return -1;
	576	return ret + 1;
	577	}
	578
	579	int fprintf_ln(FILE fp, const char fmt, ...)
	580	{
	581	int ret;
	582	va_list ap;
	583	va_start(ap, fmt);
	584	ret = vfprintf(fp, fmt, ap);
	585	va_end(ap);
	586	if (ret < 0 \|\| putc('\n', fp) == EOF)
	587	return -1;
	588	return ret + 1;
	589	}
88d5a6f6 JK	590
	591	char xstrdup_tolower(const char string)
	592	{
	593	char *result;
	594	size_t len, i;
	595
	596	len = strlen(string);
	597	result = xmalloc(len + 1);
	598	for (i = 0; i < len; i++)
	599	result[i] = tolower(string[i]);
	600	result[i] = '\0';
	601	return result;
	602	}