diff options
Diffstat (limited to 'lib/libc/iconv/_strtol.h')
| -rw-r--r-- | lib/libc/iconv/_strtol.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/lib/libc/iconv/_strtol.h b/lib/libc/iconv/_strtol.h new file mode 100644 index 0000000..d2d9d84 --- /dev/null +++ b/lib/libc/iconv/_strtol.h @@ -0,0 +1,167 @@ +/* $FreeBSD$ */ +/* $NetBSD: _strtol.h,v 1.2 2009/05/20 22:03:29 christos Exp $ */ + +/*- + * Copyright (c) 1990, 1993 + * The 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. 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. + * + * Original version ID: + * NetBSD: src/lib/libc/locale/_wcstol.h,v 1.2 2003/08/07 16:43:03 agc Exp + */ + +/* + * function template for strtol, strtoll and strtoimax. + * + * parameters: + * _FUNCNAME : function name + * __INT : return type + * __INT_MIN : lower limit of the return type + * __INT_MAX : upper limit of the return type + */ + +__INT +_FUNCNAME(const char *nptr, char **endptr, int base) +{ + const char *s; + __INT acc, cutoff; + unsigned char c; + int any, cutlim, i, neg; + + /* check base value */ + if (base && (base < 2 || base > 36)) { +#if !defined(_KERNEL) && !defined(_STANDALONE) + errno = EINVAL; + if (endptr != NULL) + /* LINTED interface specification */ + *endptr = __DECONST(void *, nptr); + return (0); +#else + panic("%s: invalid base %d", __func__, base); +#endif + } + + /* + * Skip white space and pick up leading +/- sign if any. + * If base is 0, allow 0x for hex and 0 for octal, else + * assume decimal; if base is already 16, allow 0x. + */ + s = nptr; + do { + c = *s++; + } while (isspace(c)); + if (c == '-') { + neg = 1; + c = *s++; + } else { + neg = 0; + 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); + + /* + * Compute the cutoff value between legal numbers and illegal + * numbers. That is the largest legal value, divided by the + * base. An input number that is greater than this value, if + * followed by a legal input character, is too big. One that + * is equal to this value may be valid or not; the limit + * between valid and invalid numbers is then based on the last + * digit. For instance, if the range for longs is + * [-2147483648..2147483647] and the input base is 10, + * cutoff will be set to 214748364 and cutlim to either + * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated + * a value > 214748364, or equal but the next digit is > 7 (or 8), + * the number is too big, and we will return a range error. + * + * Set any if any `digits' consumed; make it negative to indicate + * overflow. + */ + cutoff = (neg ? __INT_MIN : __INT_MAX); + cutlim = (int)(cutoff % base); + cutoff /= base; + if (neg) { + if (cutlim > 0) { + cutlim -= base; + cutoff += 1; + } + cutlim = -cutlim; + } + for (acc = 0, any = 0;; c = *s++) { + if (isdigit(c)) + i = c - '0'; + else if (isalpha(c)) + i = c - (isupper(c) ? 'A' - 10 : 'a' - 10); + else + break; + if (i >= base) + break; + if (any < 0) + continue; + if (neg) { + if (acc < cutoff || (acc == cutoff && i > cutlim)) { + acc = __INT_MIN; +#if !defined(_KERNEL) && !defined(_STANDALONE) + any = -1; + errno = ERANGE; +#else + any = 0; + break; +#endif + } else { + any = 1; + acc *= base; + acc -= i; + } + } else { + if (acc > cutoff || (acc == cutoff && i > cutlim)) { + acc = __INT_MAX; +#if !defined(_KERNEL) && !defined(_STANDALONE) + any = -1; + errno = ERANGE; +#else + any = 0; + break; +#endif + } else { + any = 1; + acc *= base; + acc += i; + } + } + } + if (endptr != NULL) + /* LINTED interface specification */ + *endptr = __DECONST(void *, any ? s - 1 : nptr); + return(acc); +} |
