[Qemu-devel] [PATCH 03/14] cutils: introduce qemu_fopen_err()

[Luiz Capitulino <lcapitulino@redhat.com>]

A fopen() wrapper that takes an Error argument.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 cutils.c      | 42 ++++++++++++++++++++++++++++++++++++++++++
 qemu-common.h |  3 +++
 2 files changed, 45 insertions(+)

diff --git a/cutils.c b/cutils.c
index af308cd..bdee130 100644
--- a/cutils.c
+++ b/cutils.c
@@ -26,6 +26,7 @@
 #include <math.h>
 
 #include "qemu_socket.h"
+#include "error.h"
 
 void pstrcpy(char *buf, int buf_size, const char *str)
 {
@@ -549,3 +550,44 @@ int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset)
     return do_sendv_recvv(sockfd, iov, len, iov_offset, 1);
 }
 
+static void set_open_err(Error **errp, const char *path, int err_nr)
+{
+    switch (err_nr) {
+    case EACCES:
+        error_set(errp, QERR_INVALID_ACCESS);
+        return;
+    case EMFILE:
+        error_set(errp, QERR_TOO_MANY_FILES_PROC);
+        return;
+    case ENFILE:
+        error_set(errp, QERR_TOO_MANY_FILES_SYS);
+        return;
+    case ENAMETOOLONG:
+        error_set(errp, QERR_NAME_TOO_LONG);
+        return;
+    case ENOSPC:
+        error_set(errp, QERR_NO_SPACE);
+        return;
+    case EPERM:
+        error_set(errp, QERR_PERMISSION_DENIED);
+        return;
+    case EROFS:
+        error_set(errp, QERR_READ_ONLY_FS);
+        return;
+    default:
+        error_set(errp, QERR_OPEN_FILE_FAILED, path);
+        return;
+    }
+}
+
+FILE *qemu_fopen_err(const char *path, const char *mode, Error **errp)
+{
+    FILE *fp;
+
+    fp = fopen(path, mode);
+    if (!fp) {
+        set_open_err(errp, path, errno);
+    }
+
+    return fp;
+}
diff --git a/qemu-common.h b/qemu-common.h
index cccfb42..2cab2a8 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -4,6 +4,7 @@
 
 #include "compiler.h"
 #include "config-host.h"
+#include "error.h"
 
 #if defined(__arm__) || defined(__sparc__) || defined(__mips__) || defined(__hppa__) || defined(__ia64__)
 #define WORDS_ALIGNED
@@ -208,6 +209,8 @@ int qemu_pipe(int pipefd[2]);
 int qemu_recvv(int sockfd, struct iovec *iov, int len, int iov_offset);
 int qemu_sendv(int sockfd, struct iovec *iov, int len, int iov_offset);
 
+FILE *qemu_fopen_err(const char *path, const char *mode, Error **errp);
+
 /* Error handling.  */
 
 void QEMU_NORETURN hw_error(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
-- 
1.7.10.2.565.gbd578b5