[XTF PATCH v1 05/15] common: add simple atou()

[dmukhin@xxxxxxxx]

From: Denis Mukhin <dmukhin@xxxxxxxx>

Signed-off-by: Denis Mukhin <dmukhin@xxxxxxxx>
---
 common/libc/string.c | 24 ++++++++++++++++++++++++
 include/xtf/libc.h   |  2 ++
 2 files changed, 26 insertions(+)

diff --git a/common/libc/string.c b/common/libc/string.c
index 8ddceab7419d..e0e40ccfa1df 100644
--- a/common/libc/string.c
+++ b/common/libc/string.c
@@ -97,6 +97,30 @@ int (memcmp)(const void *s1, const void *s2, size_t n)
     return res;
 }
 
+unsigned int atou(const char *s)
+{
+    unsigned int val = 0;
+
+    while ( *s == ' ' || *s == '\t' || *s == '\n' ||
+            *s == '\r' || *s == '\f' || *s == '\v' )
+        ++s;
+
+    if ( *s == '+' )
+        ++s;
+
+    while ( *s >= '0' && *s <= '9' )
+    {
+        unsigned int digit = *s++ - '0';
+
+        if ( val > (~0u - digit) / 10 )
+            return ~0u;
+
+        val = val * 10 + digit;
+    }
+
+    return val;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/include/xtf/libc.h b/include/xtf/libc.h
index 86d2abdf2c6a..62fd37c77d65 100644
--- a/include/xtf/libc.h
+++ b/include/xtf/libc.h
@@ -40,6 +40,8 @@ int memcmp(const void *s1, const void *s2, size_t n);
 
 size_t strnlen(const char *str, size_t max);
 
+unsigned int atou(const char *s);
+
 /*
  * Internal version of vsnprintf(), taking extra control flags.
  *
-- 
2.55.0