[PATCH kvm-unit-tests v2 6/8] Introduce atol()

[Jason Wang <jasowang@xxxxxxxxxx>]

Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
 lib/libcflat.h |    1 +
 lib/string.c   |   31 +++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 0 deletions(-)

diff --git a/lib/libcflat.h b/lib/libcflat.h
index 9cb90cf..d4ee2e0 100644
--- a/lib/libcflat.h
+++ b/lib/libcflat.h
@@ -50,6 +50,7 @@ extern void puts(const char *s);
 
 extern void *memset(void *s, int c, size_t n);
 
+extern long atol(const char *ptr);
 #define ARRAY_SIZE(_a)  (sizeof(_a)/sizeof((_a)[0]))
 
 #endif
diff --git a/lib/string.c b/lib/string.c
index acac3c0..1f19f5c 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -30,3 +30,34 @@ void *memset(void *s, int c, size_t n)
 
     return s;
 }
+
+long atol(const char *ptr)
+{
+    long acc = 0;
+    const char *s = ptr;
+    int neg, c;
+
+    while (*s == ' ' || *s == '\t')
+        s++;
+    if (*s == '-'){
+        neg = 1;
+        s++;
+    } else {
+        neg = 0;
+        if (*s == '+')
+            s++;
+    }
+
+    while (*s) {
+        if (*s < '0' || *s > '9')
+            break;
+        c = *s - '0';
+        acc = acc * 10 + c;
+        s++;
+    }
+
+    if (neg)
+        acc = -acc;
+
+    return acc;
+}

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