[PATCH/WIP v2 01/19] wrapper: implement xopen()

[Paul Tan <pyokagan@gmail.com>]

A common usage pattern of open() is to check if it was successful, and
die() if it was not:

	int fd = open(path, O_WRONLY | O_CREAT, 0777);
	if (fd < 0)
		die_errno(_("Could not open '%s' for writing."), path);

Implement a wrapper function xopen() that does the above so that we can
save a few lines of code, and make the die() messages consistent.

Helped-by: Torsten Bögershausen <tboegi@web.de>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
---

Notes:
    v2
    
    * retry on EINTR
    
    * mode is now an optional argument in xopen(). We use the mode argument
      only if O_CREAT is specified in oflag.

 git-compat-util.h |  1 +
 wrapper.c         | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/git-compat-util.h b/git-compat-util.h
index 17584ad..95cc278 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -718,6 +718,7 @@ extern char *xstrndup(const char *str, size_t len);
 extern void *xrealloc(void *ptr, size_t size);
 extern void *xcalloc(size_t nmemb, size_t size);
 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
+extern int xopen(const char *path, int flags, ...);
 extern ssize_t xread(int fd, void *buf, size_t len);
 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
diff --git a/wrapper.c b/wrapper.c
index c1a663f..82658b3 100644
--- a/wrapper.c
+++ b/wrapper.c
@@ -189,6 +189,31 @@ void *xcalloc(size_t nmemb, size_t size)
 # endif
 #endif
 
+/**
+ * xopen() is the same as open(), but it die()s if the open() fails.
+ */
+int xopen(const char *path, int oflag, ...)
+{
+	mode_t mode = 0;
+	va_list ap;
+
+	va_start(ap, oflag);
+	if (oflag & O_CREAT)
+		mode = va_arg(ap, mode_t);
+	va_end(ap);
+
+	assert(path);
+
+	for (;;) {
+		int fd = open(path, oflag, mode);
+		if (fd >= 0)
+			return fd;
+		if (errno == EINTR)
+			continue;
+		die_errno(_("could not open '%s'"), path);
+	}
+}
+
 /*
  * xread() is the same a read(), but it automatically restarts read()
  * operations with a recoverable error (EAGAIN and EINTR). xread()
-- 
2.1.4