+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,
+ const char **placeholders, expand_fn_t fn, void *context)
+{
+ for (;;) {
+ const char *percent, **p;
+
+ percent = strchrnul(format, '%');
+ strbuf_add(sb, format, percent - format);
+ if (!*percent)
+ break;
+ format = percent + 1;
+
+ for (p = placeholders; *p; p++) {
+ if (!prefixcmp(format, *p))
+ break;
+ }
+ if (*p) {
+ fn(sb, *p, context);
+ format += strlen(*p);
+ } else
+ strbuf_addch(sb, '%');
+ }
+}
+
+size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
+{
+ size_t res;
+
+ strbuf_grow(sb, size);
+ res = fread(sb->buf + sb->len, 1, size, f);
+ if (res > 0) {
+ strbuf_setlen(sb, sb->len + res);
+ }
+ return res;
+}
+
+ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
+{
+ size_t oldlen = sb->len;
+
+ 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) {
+ strbuf_setlen(sb, oldlen);
+ return -1;
+ }
+ if (!cnt)
+ break;
+ sb->len += cnt;
+ strbuf_grow(sb, 8192);