strbuf.c - jrn/git - Git at Google

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

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

 int suffixcmp(const char *str, const char *suffix)
 {
 	int len = strlen(str), suflen = strlen(suffix);
 	if (len < suflen)
 		return -1;
 	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 = sb->alloc ? sb->buf : NULL;
 	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)
 {
 	if (sb->len + extra + 1 <= sb->len)
 		die("you want to use way too much memory");
 	if (!sb->alloc)
 		sb->buf = NULL;
 	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
 }

 void strbuf_trim(struct strbuf *sb)
 {
 	char *b = sb->buf;
 	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
 		sb->len--;
 	while (sb->len > 0 && isspace(*b)) {
 		b++;
 		sb->len--;
 	}
 	memmove(sb->buf, b, sb->len);
 	sb->buf[sb->len] = '\0';
 }
 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(const struct strbuf *sb, int delim)
 {
 	int alloc = 2, pos = 0;
 	char *n, *p;
 	struct strbuf **ret;
 	struct strbuf *t;

 	ret = xcalloc(alloc, sizeof(struct strbuf *));
 	p = n = sb->buf;
 	while (n < sb->buf + sb->len) {
 		int len;
 		n = memchr(n, delim, sb->len - (n - sb->buf));
 		if (pos + 1 >= alloc) {
 			alloc = alloc * 2;
 			ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
 		}
 		if (!n)
 			n = sb->buf + sb->len - 1;
 		len = n - p + 1;
 		t = xmalloc(sizeof(struct strbuf));
 		strbuf_init(t, len);
 		strbuf_add(t, p, len);
 		ret[pos] = t;
 		ret[++pos] = NULL;
 		p = ++n;
 	}
 	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 (pos + len < pos)
 		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, ...)
 {
 	int len;
 	va_list ap;

 	if (!strbuf_avail(sb))
 		strbuf_grow(sb, 64);
 	va_start(ap, fmt);
 	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 	va_end(ap);
 	if (len < 0)
 		die("your vsnprintf is broken");
 	if (len > strbuf_avail(sb)) {
 		strbuf_grow(sb, len);
 		va_start(ap, fmt);
 		len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
 		va_end(ap);
 		if (len > strbuf_avail(sb)) {
 			die("this should not happen, your snprintf is broken");
 		}
 	}
 	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;

 	strbuf_grow(sb, 0);
 	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_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;
 }

 int strbuf_branchname(struct strbuf *sb, const char *name)
 {
 	int len = strlen(name);
 	if (interpret_branch_name(name, sb) == len)
 		return 0;
 	strbuf_add(sb, name, len);
 	return len;
 }

 int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
 {
 	strbuf_branchname(sb, name);
 	strbuf_splice(sb, 0, 0, "refs/heads/", 11);
 	return check_ref_format(sb->buf);
 }
	#include "cache.h"
	#include "refs.h"

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

	int suffixcmp(const char str, const char suffix)
	{
	int len = strlen(str), suflen = strlen(suffix);
	if (len < suflen)
	return -1;
	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 = sb->alloc ? sb->buf : NULL;
	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)
	{
	if (sb->len + extra + 1 <= sb->len)
	die("you want to use way too much memory");
	if (!sb->alloc)
	sb->buf = NULL;
	ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
	}

	void strbuf_trim(struct strbuf *sb)
	{
	char *b = sb->buf;
	while (sb->len > 0 && isspace((unsigned char)sb->buf[sb->len - 1]))
	sb->len--;
	while (sb->len > 0 && isspace(*b)) {
	b++;
	sb->len--;
	}
	memmove(sb->buf, b, sb->len);
	sb->buf[sb->len] = '\0';
	}
	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(const struct strbuf sb, int delim)
	{
	int alloc = 2, pos = 0;
	char n, p;
	struct strbuf **ret;
	struct strbuf *t;

	ret = xcalloc(alloc, sizeof(struct strbuf *));
	p = n = sb->buf;
	while (n < sb->buf + sb->len) {
	int len;
	n = memchr(n, delim, sb->len - (n - sb->buf));
	if (pos + 1 >= alloc) {
	alloc = alloc * 2;
	ret = xrealloc(ret, sizeof(struct strbuf ) alloc);
	}
	if (!n)
	n = sb->buf + sb->len - 1;
	len = n - p + 1;
	t = xmalloc(sizeof(struct strbuf));
	strbuf_init(t, len);
	strbuf_add(t, p, len);
	ret[pos] = t;
	ret[++pos] = NULL;
	p = ++n;
	}
	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 (pos + len < pos)
	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, ...)
	{
	int len;
	va_list ap;

	if (!strbuf_avail(sb))
	strbuf_grow(sb, 64);
	va_start(ap, fmt);
	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
	va_end(ap);
	if (len < 0)
	die("your vsnprintf is broken");
	if (len > strbuf_avail(sb)) {
	strbuf_grow(sb, len);
	va_start(ap, fmt);
	len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
	va_end(ap);
	if (len > strbuf_avail(sb)) {
	die("this should not happen, your snprintf is broken");
	}
	}
	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;

	strbuf_grow(sb, 0);
	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_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;
	}

	int strbuf_branchname(struct strbuf sb, const char name)
	{
	int len = strlen(name);
	if (interpret_branch_name(name, sb) == len)
	return 0;
	strbuf_add(sb, name, len);
	return len;
	}

	int strbuf_check_branch_ref(struct strbuf sb, const char name)
	{
	strbuf_branchname(sb, name);
	strbuf_splice(sb, 0, 0, "refs/heads/", 11);
	return check_ref_format(sb->buf);
	}