typo fixed in bio.c

[redis.git] / src / syncio.c

diff --git a/src/syncio.c b/src/syncio.c
index 81eeda08f9be27232aea66b061163f71d8790499..3d0e0451bfd41011bab2d0a524ef66dbceb58e16 100644 (file)
--- a/src/syncio.c
+++ b/src/syncio.c
@@ -1,9 +1,4 @@
-/* Synchronous socket I/O operations, with timeouts.
- * Redis performs most of the I/O in a nonblocking way, with the exception
- * of the SYNC command where the slave does it in a blocking way, and
- * the MIGRATE command that must be blocking in order to be atomic from the
- * point of view of the two instances (one migrating the key and one receiving
- * the key). This is why need the following blocking I/O functions.
+/* Synchronous socket and file I/O operations useful across the core.
  *
  * Copyright (c) 2009-2010, Salvatore Sanfilippo <antirez at gmail dot com>
  * All rights reserved.
@@ -35,6 +30,14 @@
 
 #include "redis.h"
 
+/* ----------------- Blocking sockets I/O with timeouts --------------------- */
+
+/* Redis performs most of the I/O in a nonblocking way, with the exception
+ * of the SYNC command where the slave does it in a blocking way, and
+ * the MIGRATE command that must be blocking in order to be atomic from the
+ * point of view of the two instances (one migrating the key and one receiving
+ * the key). This is why need the following blocking I/O functions. */
+
 int syncWrite(int fd, char *ptr, ssize_t size, int timeout) {
     ssize_t nwritten, ret = size;
     time_t start = time(NULL);
@@ -96,3 +99,70 @@ int syncReadLine(int fd, char *ptr, ssize_t size, int timeout) {
     }
     return nread;
 }
+
+/* ----------------- Blocking sockets I/O with timeouts --------------------- */
+
+/* Write binary-safe string into a file in the bulkformat
+ * $<count>\r\n<payload>\r\n */
+int fwriteBulkString(FILE *fp, char *s, unsigned long len) {
+    char cbuf[128];
+    int clen;
+
+    cbuf[0] = '$';
+    clen = 1+ll2string(cbuf+1,sizeof(cbuf)-1,len);
+    cbuf[clen++] = '\r';
+    cbuf[clen++] = '\n';
+    if (fwrite(cbuf,clen,1,fp) == 0) return 0;
+    if (len > 0 && fwrite(s,len,1,fp) == 0) return 0;
+    if (fwrite("\r\n",2,1,fp) == 0) return 0;
+    return 1;
+}
+
+/* Write a multi bulk count in the form "*<count>\r\n" */
+int fwriteBulkCount(FILE *fp, char prefix, int count) {
+    char cbuf[128];
+    int clen;
+
+    cbuf[0] = prefix;
+    clen = 1+ll2string(cbuf+1,sizeof(cbuf)-1,count);
+    cbuf[clen++] = '\r';
+    cbuf[clen++] = '\n';
+    if (fwrite(cbuf,clen,1,fp) == 0) return 0;
+    return 1;
+}
+
+/* Write a double value in bulk format $<count>\r\n<payload>\r\n */
+int fwriteBulkDouble(FILE *fp, double d) {
+    char buf[128], dbuf[128];
+
+    snprintf(dbuf,sizeof(dbuf),"%.17g\r\n",d);
+    snprintf(buf,sizeof(buf),"$%lu\r\n",(unsigned long)strlen(dbuf)-2);
+    if (fwrite(buf,strlen(buf),1,fp) == 0) return 0;
+    if (fwrite(dbuf,strlen(dbuf),1,fp) == 0) return 0;
+    return 1;
+}
+
+/* Write a long value in bulk format $<count>\r\n<payload>\r\n */
+int fwriteBulkLongLong(FILE *fp, long long l) {
+    char bbuf[128], lbuf[128];
+    unsigned int blen, llen;
+    llen = ll2string(lbuf,32,l);
+    blen = snprintf(bbuf,sizeof(bbuf),"$%u\r\n%s\r\n",llen,lbuf);
+    if (fwrite(bbuf,blen,1,fp) == 0) return 0;
+    return 1;
+}
+
+/* Delegate writing an object to writing a bulk string or bulk long long. */
+int fwriteBulkObject(FILE *fp, robj *obj) {
+    /* Avoid using getDecodedObject to help copy-on-write (we are often
+     * in a child process when this function is called). */
+    if (obj->encoding == REDIS_ENCODING_INT) {
+        return fwriteBulkLongLong(fp,(long)obj->ptr);
+    } else if (obj->encoding == REDIS_ENCODING_RAW) {
+        return fwriteBulkString(fp,obj->ptr,sdslen(obj->ptr));
+    } else {
+        redisPanic("Unknown string encoding");
+    }
+}
+
+