Added `sread' and `swrite': `read' and `write' like functions that assure that all...

diff --git a/src/common.c b/src/common.c
index 78be3afce48a6318336367b618c7660b0bad3034..138b7678cf3767fc7c3a6f551e86842ac3176b84 100644 (file)
--- a/src/common.c
+++ b/src/common.c
@@ -125,6 +125,61 @@ void sfree (void **ptr)
 }
 #endif
 
+ssize_t sread (int fd, void *buf, size_t count)
+{
+       char    *ptr;
+       size_t   nleft;
+       ssize_t  status;
+
+       ptr   = (char *) buf;
+       nleft = count;
+
+       while (nleft > 0)
+       {
+               status = read (fd, (void *) ptr, nleft);
+
+               if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
+                       continue;
+
+               if (status < 0)
+                       return (status);
+
+               assert (nleft >= status);
+
+               nleft = nleft - status;
+               ptr   = ptr   + status;
+       }
+
+       return (0);
+}
+
+
+ssize_t swrite (int fd, const void *buf, size_t count)
+{
+       const char *ptr;
+       size_t      nleft;
+       ssize_t     status;
+
+       ptr   = (const char *) buf;
+       nleft = buflen;
+
+       while (nleft > 0)
+       {
+               status = write (fd, (const void *) ptr, nleft);
+
+               if ((status < 0) && ((errno == EAGAIN) || (errno == EINTR)))
+                       continue;
+
+               if (status < 0)
+                       return (status);
+
+               nleft = nleft - status;
+               ptr   = ptr   + status;
+       }
+
+       return (0);
+}
+
 int strsplit (char *string, char **fields, size_t size)
 {
        size_t i;

diff --git a/src/common.h b/src/common.h
index 4dc34b07f0420c5f2e8cf5e68c74efb717a6839e..f6a8e19a68843b71acec79896d5592dc41e244ad 100644 (file)
--- a/src/common.h
+++ b/src/common.h
@@ -37,6 +37,44 @@ void sstrncpy(char *d, const char *s, int len);
 char *sstrdup(const char *s);
 void *smalloc(size_t size);
 
+/*
+ * NAME
+ *   sread
+ *
+ * DESCRIPTION
+ *   Reads exactly `n' bytes or failes. Syntax and other behavior is analogous
+ *   to `read(2)'.
+ *
+ * PARAMETERS
+ *   `fd'          File descriptor to write to.
+ *   `buf'         Buffer that is to be written.
+ *   `count'       Numver of bytes in the buffer.
+ *
+ * RETURN VALUE
+ *   Zero upon success or non-zero if an error occured. `errno' is set in this
+ *   case.
+ */
+ssize_t sread (int fd, void *buf, size_t count);
+
+/*
+ * NAME
+ *   swrite
+ *
+ * DESCRIPTION
+ *   Writes exactly `n' bytes or failes. Syntax and other behavior is analogous
+ *   to `write(2)'.
+ *
+ * PARAMETERS
+ *   `fd'          File descriptor to write to.
+ *   `buf'         Buffer that is to be written.
+ *   `count'       Numver of bytes in the buffer.
+ *
+ * RETURN VALUE
+ *   Zero upon success or non-zero if an error occured. `errno' is set in this
+ *   case.
+ */
+ssize_t swrite (int fd, const void *buf, size_t count);
+
 /*
  * NAME
  *   strsplit