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Diffstat (limited to 'libiberty/strtoull.c')
| -rw-r--r-- | libiberty/strtoull.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/libiberty/strtoull.c b/libiberty/strtoull.c new file mode 100644 index 0000000..2f580fb --- /dev/null +++ b/libiberty/strtoull.c @@ -0,0 +1,122 @@ +/* + * Copyright (c) 2014 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. [rescinded 22 July 1999] + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif +#ifdef HAVE_LIMITS_H +#include <limits.h> +#endif +#ifdef HAVE_SYS_PARAM_H +#include <sys/param.h> +#endif +#include <errno.h> +#ifdef NEED_DECLARATION_ERRNO +extern int errno; +#endif +#if 0 +#include <stdlib.h> +#endif +#include "ansidecl.h" +#include "safe-ctype.h" + +#ifdef HAVE_LONG_LONG + +__extension__ +typedef unsigned long long ullong_type; + +#ifndef ULLONG_MAX +#define ULLONG_MAX (~(ullong_type)0) /* 0xFFFFFFFFFFFFFFFF */ +#endif + +/* + * Convert a string to an unsigned long long integer. + * + * Ignores `locale' stuff. Assumes that the upper and lower case + * alphabets and digits are each contiguous. + */ +ullong_type +strtoull(const char *nptr, char **endptr, register int base) +{ + register const char *s = nptr; + register ullong_type acc; + register int c; + register ullong_type cutoff; + register int neg = 0, any, cutlim; + + /* + * See strtol for comments as to the logic used. + */ + do { + c = *s++; + } while (ISSPACE(c)); + if (c == '-') { + neg = 1; + c = *s++; + } else if (c == '+') + c = *s++; + if ((base == 0 || base == 16) && + c == '0' && (*s == 'x' || *s == 'X')) { + c = s[1]; + s += 2; + base = 16; + } + if (base == 0) + base = c == '0' ? 8 : 10; + cutoff = (ullong_type)ULLONG_MAX / (ullong_type)base; + cutlim = (ullong_type)ULLONG_MAX % (ullong_type)base; + for (acc = 0, any = 0;; c = *s++) { + if (ISDIGIT(c)) + c -= '0'; + else if (ISALPHA(c)) + c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10; + else + break; + if (c >= base) + break; + if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) + any = -1; + else { + any = 1; + acc *= base; + acc += c; + } + } + if (any < 0) { + acc = ULLONG_MAX; + errno = ERANGE; + } else if (neg) + acc = -acc; + if (endptr != 0) + *endptr = (char *) (any ? s - 1 : nptr); + return (acc); +} + +#endif /* ifdef HAVE_LONG_LONG */ |