common: New function scan_secondsstr.

* common/gettime.c (scan_secondsstr): New.

* common/t-gettime.c (test_scan_secondsstr):
(main): Call it.

1 files changed, 23 insertions, 0 deletions

diff --git a/common/gettime.c b/common/gettime.c
index 2a9b71779..c3b0c6c6c 100644
--- a/common/gettime.c
+++ b/common/gettime.c
@@ -37,6 +37,7 @@
 #ifdef HAVE_LANGINFO_H
 #include <langinfo.h>
 #endif
+#include <stdint.h>    /* We use uint64_t.  */
 
 #include "util.h"
 #include "i18n.h"
@@ -172,6 +173,28 @@ make_timestamp (void)
 }
 
 
+/* Specialized version of atoi which returns an u32 instead of an int
+ * and caps the result at 2^32-2.  Leading white space is skipped,
+ * scanning stops at at the first non-convertable byte.  Note that we
+ * do not cap at 2^32-1 because that value is often used as error
+ * return. */
+u32
+scan_secondsstr (const char *string)
+{
+  uint64_t value = 0;
+
+  while (*string == ' ' || *string == '\t')
+    string++;
+  for (; *string >= '0' && *string <= '9'; string++)
+    {
+      value *= 10;
+      value += atoi_1 (string);
+      if (value >= (u32)(-1))
+        return (u32)(-1) - 1;
+    }
+  return (u32)value;
+}
+
 
 /****************
  * Scan a date string and return a timestamp.