tools/perf/util/strbuf.c

Source file repositories/reference/linux-study-clean/tools/perf/util/strbuf.c

File Facts

System
Linux kernel
Corpus path
tools/perf/util/strbuf.c
Extension
.c
Size
3218 bytes
Lines
171
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

if (ret) {
			va_end(ap_saved);
			return ret;
		}
		len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved);
		if (len > strbuf_avail(sb)) {
			pr_debug("this should not happen, your vsnprintf is broken");
			va_end(ap_saved);
			return -EINVAL;
		}
	}
	va_end(ap_saved);
	return strbuf_setlen(sb, sb->len + len);
}

int strbuf_addf(struct strbuf *sb, const char *fmt, ...)
{
	va_list ap;
	int ret;

	va_start(ap, fmt);
	ret = strbuf_addv(sb, fmt, ap);
	va_end(ap);
	return ret;
}

ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
{
	size_t oldlen = sb->len;
	size_t oldalloc = sb->alloc;
	int ret;

	ret = strbuf_grow(sb, hint ? hint : 8192);
	if (ret)
		return ret;

	for (;;) {
		ssize_t cnt;

		cnt = read(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 cnt;
		}
		if (!cnt)
			break;
		sb->len += cnt;
		ret = strbuf_grow(sb, 8192);
		if (ret)
			return ret;
	}

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

Annotation

Implementation Notes