[core] log_error_multiline()

rename log_error_multiline_buffer() to log_error_multiline()
and take (char *)ptr and (size_t)len instead of (buffer *)b

When debug printing request and response headers,
print each header on separate line for readability
and omit '\r' if "\r\n" ends line

src/connections.c

@@ -772,9 +772,8 @@ static int connection_handle_read_state(connection * const con)  {
 
     r->rqst_header_len = header_len;
     if (r->conf.log_request_header)
-        log_error(r->conf.errh, __FILE__, __LINE__,
-          "fd: %d request-len: %d\n%.*s", con->fd,
-          (int)header_len, (int)header_len, hdrs);
+        log_error_multiline(r->conf.errh, __FILE__, __LINE__,
+                            hdrs, header_len, "fd:%d rqst: ", con->fd);
     http_request_headers_process(r, hdrs, hoff, con->proto_default_port);
     chunkqueue_mark_written(cq, r->rqst_header_len);
     connection_set_state(r, CON_STATE_REQUEST_END);

src/log.c

@@ -247,13 +247,14 @@ log_perror (log_error_st * const errh,
 
 
 void
-log_error_multiline_buffer (log_error_st * const restrict errh,
-                            const char * const restrict filename,
-                            const unsigned int line,
-                            const buffer * const restrict multiline,
-                            const char * const restrict fmt, ...)
+log_error_multiline (log_error_st * const restrict errh,
+                     const char * const restrict filename,
+                     const unsigned int line,
+                     const char * const restrict multiline,
+                     const size_t len,
+                     const char * const restrict fmt, ...)
 {
-    if (multiline->used < 2) return;
+    if (0 == len) return;
 
     const int errnum = errno;
     buffer * const b = &errh->b;
@@ -264,17 +265,19 @@ log_error_multiline_buffer (log_error_st * const restrict errh,
     log_buffer_vprintf(b, fmt, ap);
     va_end(ap);
 
-    const size_t prefix_len = buffer_clen(b);
-    const char * const end = multiline->ptr + multiline->used - 2;
-    const char *pos = multiline->ptr-1, *current_line;
-    do {
-        pos = strchr(current_line = pos+1, '\n');
+    const uint32_t prefix_len = buffer_clen(b);
+    const char * const end = multiline + len;
+    for (const char *pos = multiline; pos < end; ++pos) {
+        const char * const current_line = pos;
+        pos = strchr(pos, '\n');
         if (!pos)
             pos = end;
+        size_t n = (size_t)(pos - current_line);
+        if (n && current_line[n-1] == '\r') --n; /*(skip "\r\n")*/
         buffer_truncate(b, prefix_len);
-        log_buffer_append_encoded(b, current_line, pos - current_line);
+        log_buffer_append_encoded(b, current_line, n);
         log_write(errh, b);
-    } while (pos < end);
+    }
 
     errno = errnum;
 }

src/log.h

@@ -42,7 +42,7 @@ __attribute_format__((__printf__, 4, 5))
 void log_perror(log_error_st *errh, const char *filename, unsigned int line, const char *fmt, ...);
 
 __attribute_cold__
-__attribute_format__((__printf__, 5, 6))
-void log_error_multiline_buffer(log_error_st *errh, const char *filename, unsigned int line, const buffer *multiline, const char *fmt, ...);
+__attribute_format__((__printf__, 6, 7))
+void log_error_multiline(log_error_st *errh, const char *filename, unsigned int line, const char * restrict multiline, const size_t len, const char *fmt, ...);
 
 #endif

src/mod_fastcgi.c

@@ -462,8 +462,8 @@ static handler_t fcgi_recv_parse(request_st * const r, struct http_response_opts
 				buffer * const tb = r->tmp_buf;
 				buffer_clear(tb);
 				fastcgi_get_packet_body(tb, hctx, &packet);
-				log_error_multiline_buffer(r->conf.errh, __FILE__, __LINE__, tb,
-				  "FastCGI-stderr:");
+				log_error_multiline(r->conf.errh, __FILE__, __LINE__,
+				  BUF_PTR_LEN(tb), "FastCGI-stderr:");
 			}
 			break;
 		case FCGI_END_REQUEST:

src/request.c

@@ -1266,8 +1266,8 @@ http_request_headers_process (request_st * const restrict r, char * const restri
         if (r->conf.log_request_header_on_error) {
             /*(http_request_parse_headers() modifies hdrs only to
              * undo line-wrapping in-place using spaces)*/
-            log_error(r->conf.errh, __FILE__, __LINE__,
-              "request-header:\n%.*s", (int)r->rqst_header_len, hdrs);
+            log_error_multiline(r->conf.errh, __FILE__, __LINE__,
+                                hdrs, r->rqst_header_len, "rqst: ");
         }
     }
 }

src/response.c

@@ -161,7 +161,8 @@ http_response_write_header (request_st * const r)
 	r->resp_header_len = buffer_clen(b);
 
 	if (r->conf.log_response_header) {
-		log_error(r->conf.errh,__FILE__,__LINE__,"Response-Header:\n%s",b->ptr);
+		log_error_multiline(r->conf.errh, __FILE__, __LINE__,
+		                    BUF_PTR_LEN(b), "fd:%d resp: ", r->con->fd);
 	}
 
 	chunkqueue_prepend_buffer_commit(cq);