shl: add shl_strtou() helper

The standard C/POSIX helpers are really ugly to use. This small helper
returns 0 on success, otherwise an error.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>

diff --git a/Makefile.am b/Makefile.am
index 8537040..e7aafda 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -88,6 +88,8 @@ SHL_LLOG = \
        src/shl_llog.h
 SHL_HOOK = \
        src/shl_hook.h
+SHL_MISC = \
+       src/shl_misc.h
 
 #
 # libeloop

diff --git a/src/shl_misc.h b/src/shl_misc.h
new file mode 100644 (file)
index 0000000..2d8909b
--- /dev/null
+++ b/src/shl_misc.h
@@ -0,0 +1,60 @@
+/*
+ * shl - Miscellaneous small helpers
+ *
+ * Copyright (c) 2011-2012 David Herrmann <dh.herrmann@googlemail.com>
+ * Copyright (c) 2011 University of Tuebingen
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * Miscellaneous helpers
+ */
+
+#ifndef SHL_MISC_H
+#define SHL_MISC_H
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+int shl_strtou(const char *input, unsigned int *output) {
+       unsigned long val;
+       unsigned int res;
+       char *tmp = NULL;
+
+       if (!input || !*input)
+               return -EINVAL;
+
+       errno = 0;
+       val = strtoul(input, &tmp, 0);
+
+       res = val;
+       if (!tmp || *tmp || errno || (unsigned long)res != val)
+               return -EINVAL;
+
+       if (output)
+               *output = res;
+       return 0;
+}
+
+#endif /* SHL_MISC_H */