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Diffstat (limited to 'stdlib')
-rw-r--r--stdlib/a64l.c57
1 files changed, 34 insertions, 23 deletions
diff --git a/stdlib/a64l.c b/stdlib/a64l.c
index d1dd3a9b6b..eb1eef5cbf 100644
--- a/stdlib/a64l.c
+++ b/stdlib/a64l.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1995, 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
 
@@ -19,36 +19,47 @@
 
 #include <stdlib.h>
 
+#define TABLE_BASE 0x20
+#define TABLE_SIZE 0x60
+
+#define XX ((char)0x40)
+
+
+static const char a64l_table[TABLE_SIZE] =
+{
+  /* 0x20 */  XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX, XX,  0,  1,
+  /* 0x30 */   2,  3,  4,  5,  6,  7,  8,  9, 10, 11, XX, XX, XX, XX, XX, XX,
+  /* 0x40 */  XX, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
+  /* 0x50 */  27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, XX, XX, XX, XX, XX,
+  /* 0x60 */  XX, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
+  /* 0x70 */  53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, XX, XX, XX, XX, XX
+};
+
+
 long int
 a64l (string)
      const char *string;
 {
-  size_t cnt;
-  unsigned long int result = 0l;
+  const char *ptr = string;
+  unsigned long int result = 0ul;
+  const char *end = ptr + 6;
 
-  for (cnt = 0; cnt < 6; ++cnt)
+  do
     {
+      unsigned index;
+      unsigned value;
+
+      index = *ptr - TABLE_BASE;
+      if ((unsigned int) index >= TABLE_SIZE)
+	break;
+      value = (int) a64l_table[index];
+      if (value == (int) XX)
+	break;
       result <<= 6;
-      switch (string[cnt])
-	{
-	case '.':
-	  break;
-	case '/':
-	  result |= 1;
-	  break;
-	case '0' ... '9':
-	  result |= 2 + string[cnt] - '0';
-	  break;
-	case 'A' ... 'Z':
-	  result |= 12 + string[cnt] - 'A';
-	  break;
-	case 'a' ... 'z':
-	  result |= 38 + string[cnt] - 'a';
-	  break;
-	default:
-	  return result >> 6;
-	}
+      ++ptr;
+      result |= value;
     }
+  while (ptr != end);
 
   return (long int) result;
 }