Commit yaboot 1.3.0

[tonyb-yaboot.git] / lib / strtol.c

diff --git a/lib/strtol.c b/lib/strtol.c
new file mode 100644 (file)
index 0000000..2a38f3a
--- /dev/null
+++ b/lib/strtol.c
@@ -0,0 +1,140 @@
+/* Copyright (C) 1991, 1992, 1994, 1995 Free Software Foundation, Inc.
+
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If
+   not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+   Cambridge, MA 02139, USA.  */
+
+/* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
+   If BASE is 0 the base is determined by the presence of a leading
+   zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
+   If BASE is < 2 or > 36, it is reset to 10.
+   If ENDPTR is not NULL, a pointer to the character after the last
+   one converted is stored in *ENDPTR.  */
+
+#include "ctype.h"
+
+int strtol (nptr, endptr, base)
+const char *nptr;
+char **endptr;
+int base;
+{
+    int negative;
+    register unsigned int cutoff;
+    register unsigned int cutlim;
+    register unsigned int i;
+    register const char *s;
+    register unsigned char c;
+    const char *save, *end;
+    int overflow;
+
+    if (base < 0 || base == 1 || base > 36)
+       base = 10;
+
+    save = s = nptr;
+
+    /* Skip white space.  */
+    while (((unsigned char) *s) <= 32 && *s)
+       ++s;
+    if (*s == '\0')
+       goto noconv;
+
+    /* Check for a sign.  */
+    if (*s == '-') {
+       negative = 1;
+       ++s;
+    } else if (*s == '+') {
+       negative = 0;
+       ++s;
+    } else
+       negative = 0;
+
+    if ((base == 16 && s[0] == '0' && (s[1] == 'X')) || (s[1] == 'x'))
+       s += 2;
+
+    /* If BASE is zero, figure it out ourselves.  */
+    if (base == 0) {
+       if (*s == '0') {
+           if (s[1] == 'X' || s[1] == 'x') {
+               s += 2;
+               base = 16;
+           } else
+               base = 8;
+       } else
+           base = 10;
+    }
+
+    /* Save the pointer so we can check later if anything happened.  */
+    save = s;
+
+    end = 0;
+
+    cutoff = 0x7FFFFFFF / (unsigned int) base;
+    cutlim = 0x7FFFFFFF % (unsigned int) base;
+
+    overflow = 0;
+    i = 0;
+    for (c = *s; c != '\0'; c = *++s) {
+       if (s == end)
+           break;
+       if (c >= '0' && c <= '9')
+           c -= '0';
+       else if (c >= 'A' && c <= 'Z')
+           c = c - 'A' + 10;
+       else if (c >= 'a' && c <= 'z')
+           c = c - 'a' + 10;
+       else
+           break;
+       if (c >= base)
+           break;
+       /* Check for overflow.  */
+       if (i > cutoff || (i == cutoff && c > cutlim))
+           overflow = 1;
+       else {
+           i *= (unsigned int) base;
+           i += c;
+       }
+    }
+
+    /* Check if anything actually happened.  */
+    if (s == save)
+       goto noconv;
+
+    /* Store in ENDPTR the address of one character
+       past the last character we converted.  */
+    if (endptr)
+       *endptr = (char *) s;
+
+    if (overflow)
+       return negative ? (int) 0x80000000 : (int) 0x7FFFFFFF;
+
+    /* Return the result of the appropriate sign.  */
+    return (negative ? -i : i);
+
+  noconv:
+    /* We must handle a special case here: the base is 0 or 16 and the
+       first two characters and '0' and 'x', but the rest are no
+       hexadecimal digits.  This is no error case.  We return 0 and
+       ENDPTR points to the `x`.  */
+    if (endptr) {
+       if (save - nptr >= 2 && tolower (save[-1]) == 'x' && save[-2] == '0')
+           *endptr = (char *) &save[-1];
+       else
+           /*  There was no number to convert.  */
+           *endptr = (char *) nptr;
+    }
+
+    return 0L;
+}