Revert "wrapper: introduce writev(3p) wrappers"

This reverts commit 1970fcef93adcc5a35f6468d00a5a634d5af2b3c; let's
not use writev() for now.

wrapper.c

@@ -323,47 +323,6 @@ ssize_t write_in_full(int fd, const void *buf, size_t count)
 	return total;
 }
 
-ssize_t writev_in_full(int fd, struct iovec *iov, int iovcnt)
-{
-	ssize_t total_written = 0;
-
-	while (iovcnt) {
-		ssize_t bytes_written = writev(fd, iov, iovcnt);
-		if (bytes_written < 0) {
-			if (errno == EINTR || errno == EAGAIN)
-				continue;
-			return -1;
-		}
-		if (!bytes_written) {
-			errno = ENOSPC;
-			return -1;
-		}
-
-		total_written += bytes_written;
-
-		/*
-		 * We first need to discard any iovec entities that have been
-		 * fully written.
-		 */
-		while (iovcnt && (size_t)bytes_written >= iov->iov_len) {
-			bytes_written -= iov->iov_len;
-			iov++;
-			iovcnt--;
-		}
-
-		/*
-		 * Finally, we need to adjust the last iovec in case we have
-		 * performed a partial write.
-		 */
-		if (iovcnt && bytes_written) {
-			iov->iov_base = (char *) iov->iov_base + bytes_written;
-			iov->iov_len -= bytes_written;
-		}
-	}
-
-	return total_written;
-}
-
 ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset)
 {
 	char *p = buf;

wrapper.h

@@ -47,15 +47,6 @@ ssize_t read_in_full(int fd, void *buf, size_t count);
 ssize_t write_in_full(int fd, const void *buf, size_t count);
 ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset);
 
-/*
- * Try to write all iovecs. Returns -1 in case an error occurred with a proper
- * errno set, the number of bytes written otherwise.
- *
- * Note that the iovec will be modified as a result of this call to adjust for
- * partial writes!
- */
-ssize_t writev_in_full(int fd, struct iovec *iov, int iovcnt);
-
 static inline ssize_t write_str_in_full(int fd, const char *str)
 {
 	return write_in_full(fd, str, strlen(str));

write-or-die.c

@@ -96,14 +96,6 @@ void write_or_die(int fd, const void *buf, size_t count)
 	}
 }
 
-void writev_or_die(int fd, struct iovec *iov, int iovlen)
-{
-	if (writev_in_full(fd, iov, iovlen) < 0) {
-		check_pipe(errno);
-		die_errno("writev error");
-	}
-}
-
 void fwrite_or_die(FILE *f, const void *buf, size_t count)
 {
 	if (fwrite(buf, 1, count, f) != count)

write-or-die.h

@@ -7,7 +7,6 @@ void fprintf_or_die(FILE *, const char *fmt, ...);
 void fwrite_or_die(FILE *f, const void *buf, size_t count);
 void fflush_or_die(FILE *f);
 void write_or_die(int fd, const void *buf, size_t count);
-void writev_or_die(int fd, struct iovec *iov, int iovlen);
 
 /*
  * These values are used to help identify parts of a repository to fsync.