macros

Signed-off-by: Mattias Andrée <maandree@member.fsf.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/src/macros.h b/src/macros.h
new file mode 100644
index 0000000..298a41a
--- /dev/null
+++ b/src/macros.h
@@ -0,0 +1,57 @@
+/**
+ * Copyright © 2016  Mattias Andrée <maandree@member.fsf.org>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+
+
+#define try(...)      do { if (!(__VA_ARGS__)) goto fail; } while (0)
+#define t(...)        do { if   (__VA_ARGS__)  goto fail; } while (0)
+#define CLEANUP(...)  do { int cleanup__ = errno; __VA_ARGS__; errno = cleanup__; } while (0)
+
+#define xstrdup(outp, ...)  \
+do {  \
+	const char *xstrdup__ = (__VA_ARGS__);  \
+	if (xstrdup__)  \
+		try (*(outp) = strdup(xstrdup__));  \
+	else  \
+		*(outp) = NULL;  \
+} while (0)
+
+#define xpread(fd, buf, len, off)   t  (pread(fd, buf, len, off) < (ssize_t)(len))
+#define xpwrite(fd, buf, len, off)  t (pwrite(fd, buf, len, off) < (ssize_t)(len))
+#define xread(fd, buf, len)         t   (read(fd, buf, len)      < (ssize_t)(len))
+#define xwrite(fd, buf, len)        t  (write(fd, buf, len)      < (ssize_t)(len))
+
+#define xcalloc(outp, num)   try (*(outp) = calloc(num, sizeof(**(outp))))
+#define xmalloc(outp, num)   try (*(outp) = malloc((num) * sizeof(**(outp))))
+#define xrealloc(outp, num)  \
+do {  \
+	size_t n__ = (num);  \
+	void *new__ = realloc(*(outp), n__ * sizeof(**(outp)));  \
+	t (n__ && !new__);  \
+	*(outp) = new__;  \
+} while (0)
+
+#define SHRINK(outp, num)  \
+do {  \
+	void *new__ = realloc(*(outp), (num) * sizeof(**(outp)));  \
+	if (new__)  *(outp) = new__;  \
+} while (0)
+