Changeset 2846 for trunk/kLdr/kLdrHlp.c

Timestamp:

Nov 1, 2006, 7:26:35 PM (19 years ago)

Author:

bird

Message:

nearly done with kLdrDyldMod.

File:

• trunk/kLdr/kLdrHlp.c (modified) (1 diff)

trunk/kLdr/kLdrHlp.c

@@ -456 +456 @@
 
 /**
+ * Gets an environment variable and converts it to a size_t.
+ *
+ * @returns 0 and *pcb on success.
+ *          Some non-zero OS or kLdr status code on failure.
+ * @param   pszVar  The name of the variable.
+ * @param   pcb     Where to put the value.
+ */
+int     kldrHlpGetEnvUZ(const char *pszVar, size_t *pcb)
+{
+    size_t      cb;
+    unsigned    uBase;
+    char        szVal[64];
+    size_t      cchVal = sizeof(szVal);
+    const char *psz;
+    int         rc;
+
+    *pcb = 0;
+    rc = kldrHlpGetEnv(pszVar, szVal,  &cchVal);
+    if (rc)
+        return rc;
+
+    /* figure out the base. */
+    uBase = 10;
+    psz = szVal;
+    if (    *psz == '0'
+        &&  (psz[1] == 'x' || psz[1] == 'X'))
+    {
+        uBase = 16;
+        psz += 2;
+    }
+
+    /* convert it up to the first unknown char. */
+    cb = 0;
+    for(;;)
+    {
+        const char ch = *psz;
+        unsigned uDigit;
+        if (!ch)
+            break;
+        else if (ch >= '0' && ch <= '9')
+            uDigit = ch - '0';
+        else if (ch >= 'a' && ch <= 'z')
+            uDigit = ch - 'a' + 10;
+        else if (ch >= 'A' && ch <= 'Z')
+            uDigit = ch - 'A' + 10;
+        else
+            break;
+        if (uDigit >= uBase)
+            break;
+
+        /* add the digit */
+        cb *= uBase;
+        cb += uDigit;
+
+        psz++;
+    }
+
+    /* check for unit */
+    if (*psz == 'm' || *psz == 'M')
+        cb *= 1024*1024;
+    else if (*psz == 'k' ||*psz == 'K')
+        cb *= 1024;
+    else if (*psz == 'g' || *psz == 'G')
+        cb *= 1024*1024*1024;
+
+    *pcb = cb;
+    return 0;
+}
+
+
+/**
  * Terminate the process.
  *