#include "log.h"
#include "osl.h"
#include "error.h"
+#include "fd.h"
+
+/**
+ * Wrapper for the write system call.
+ *
+ * \param fd The file descriptor to write to.
+ * \param buf The buffer to write.
+ * \param size The length of \a buf in bytes.
+ *
+ * This function writes out the given buffer and retries if an interrupt
+ * occurred during the write.
+ *
+ * \return On success, the number of bytes written is returned, otherwise, a
+ * negative error code is returned.
+ *
+ * \sa write(2).
+ */
+static ssize_t __write(int fd, const void *buf, size_t size)
+{
+ ssize_t ret;
+
+ for (;;) {
+ ret = write(fd, buf, size);
+ if ((ret < 0) && (errno == EAGAIN || errno == EINTR))
+ continue;
+ return ret >= 0? ret : -ERRNO_TO_ERROR(errno);
+ }
+}
/**
* Write a buffer to a file descriptor, re-write on short writes.
assert(total);
*len = 0;
while (*len < total) {
- int ret = write(fd, buf + *len, total - *len);
- if (ret == -1)
- return -ERRNO_TO_ERROR(errno);
+ int ret = __write(fd, buf + *len, total - *len);
+ if (ret < 0)
+ return ret;
*len += ret;
}
return 1;
return -ERRNO_TO_ERROR(errno);
}
+/**
+ * Open a file, write the given buffer and close the file.
+ *
+ * \param filename Full path to the file to open.
+ * \param buf The buffer to write to the file.
+ * \param size The size of \a buf.
+ *
+ * \return Standard.
+ */
+int write_file(const char *filename, const void *buf, size_t size)
+{
+ int ret, fd;
+
+ ret = osl_open(filename, O_WRONLY | O_CREAT | O_EXCL, 0644);
+ if (ret < 0)
+ return ret;
+ fd = ret;
+ ret = write_all(fd, buf, &size);
+ if (ret < 0)
+ goto out;
+ ret = 1;
+out:
+ close(fd);
+ return ret;
+}
+
/**
* Wrapper for chdir(2).
*
*
* \return Standard.
*/
-static int para_chdir(const char *path)
+_static_inline_ int __chdir(const char *path)
{
- int ret = chdir(path);
-
- if (ret >= 0)
+ if (chdir(path) >= 0)
return 1;
return -ERRNO_TO_ERROR(errno);
}
return ret;
*cwd = ret;
}
- ret = para_chdir(dirname);
+ ret = __chdir(dirname);
if (ret < 0)
goto close_cwd;
*dir = opendir(".");
return ret;
}
-/**
- * A wrapper for fchdir().
- *
- * \param fd An open file descriptor.
- *
- * \return Standard.
- */
-int para_fchdir(int fd)
-{
- if (fchdir(fd) < 0)
- return -ERRNO_TO_ERROR(errno);
- return 1;
-}
-
-/**
- * A wrapper for mkdir(2).
- *
- * \param path Name of the directory to create.
- * \param mode The permissions to use.
- *
- * \return Standard.
- */
-int para_mkdir(const char *path, mode_t mode)
-{
- if (!mkdir(path, mode))
- return 1;
- return -ERRNO_TO_ERROR(errno);
-}
-
/**
* Open a file and map it into memory.
*
*
* \sa munmap(2), mmap_full_file().
*/
-int para_munmap(void *start, size_t length)
+int osl_munmap(void *start, size_t length)
{
int err;
if (munmap(start, length) >= 0)
strerror(err));
return -ERRNO_TO_ERROR(err);
}
+
+/**
+ * Allocate a sufficiently large string and print into it.
+ *
+ * \param fmt A usual format string.
+ *
+ * Produce output according to \p fmt. No artificial bound on the length of the
+ * resulting string is imposed.
+ *
+ * \return This function either returns a pointer to a string that must be
+ * freed by the caller or \p NULL if memory allocation failed.
+ *
+ * \sa printf(3).
+ */
+__must_check __printf_1_2 __malloc char *make_message(const char *fmt, ...)
+{
+ int n;
+ size_t size = 100;
+ char *p = malloc(size);
+
+ if (!p)
+ return NULL;
+ while (1) {
+ char *q;
+ va_list ap;
+ /* Try to print in the allocated space. */
+ va_start(ap, fmt);
+ n = vsnprintf(p, size, fmt, ap);
+ va_end(ap);
+ /* If that worked, return the string. */
+ if (n > -1 && n < size)
+ break;
+ /* Else try again with more space. */
+ if (n > -1) /* glibc 2.1 */
+ size = n + 1; /* precisely what is needed */
+ else /* glibc 2.0 */
+ size *= 2; /* twice the old size */
+ q = realloc(p, size);
+ if (!q) {
+ free(p);
+ return NULL;
+ }
+ p = q;
+ }
+ return p;
+}
+
+/**
+ * A wrapper for truncate(2)
+ *
+ * \param path Name of the regular file to truncate
+ * \param size Number of bytes to \b shave \b off
+ *
+ * Truncate the regular file named by \a path by \a size bytes.
+ *
+ * \return Standard.
+ *
+ * \sa truncate(2)
+ */
+int truncate_file(const char *path, off_t size)
+{
+ int ret;
+ struct stat statbuf;
+
+ ret = osl_stat(path, &statbuf);
+ if (ret < 0)
+ return ret;
+ ret = -E_OSL_BAD_SIZE;
+ if (statbuf.st_size < size)
+ return ret;
+ if (truncate(path, statbuf.st_size - size) < 0)
+ return -ERRNO_TO_ERROR(errno);
+ return 1;
+}
projects / osl.git / blobdiff