1 files changed, 413 insertions, 0 deletions
diff --git a/strbuf.c b/strbuf.c
new file mode 100644
index 0000000000..a849705197
--- /dev/null
+++ b/strbuf.c
@@ -0,0 +1,413 @@
+#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)
+{
+	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)
+{
+	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_buf(const char *str, size_t slen, int delim, int max)
+{
+	int alloc = 2, pos = 0;
+	const char *n, *p;
+	struct strbuf **ret;
+	struct strbuf *t;
+
+	ret = xcalloc(alloc, sizeof(struct strbuf *));
+	p = n = str;
+	while (n < str + slen) {
+		int len;
+		if (max <= 0 || pos + 1 < max)
+			n = memchr(n, delim, slen - (n - str));
+		else
+			n = NULL;
+		if (pos + 1 >= alloc) {
+			alloc = alloc * 2;
+			ret = xrealloc(ret, sizeof(struct strbuf *) * alloc);
+		}
+		if (!n)
+			n = str + slen - 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 (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);
+}
+
+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_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)
+{
+	while (size) {
+		const char *next = memchr(buf, '\n', size);
+		next = next ? (next + 1) : (buf + size);
+		strbuf_addstr(out, prefix);
+		strbuf_add(out, buf, next - buf);
+		size -= next - buf;
+		buf = next;
+	}
+	strbuf_complete_line(out);
+}