diff options
Diffstat (limited to 'lib/libc/stdlib/strtoumax.c')
| -rw-r--r-- | lib/libc/stdlib/strtoumax.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/lib/libc/stdlib/strtoumax.c b/lib/libc/stdlib/strtoumax.c new file mode 100644 index 000000000000..769967727ac5 --- /dev/null +++ b/lib/libc/stdlib/strtoumax.c @@ -0,0 +1,131 @@ +/*- + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * Copyright (c) 2011 The FreeBSD Foundation + * All rights reserved. + * Portions of this software were developed by David Chisnall + * under sponsorship from the FreeBSD Foundation. + * + * 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +static char sccsid[] = "from @(#)strtoul.c 8.1 (Berkeley) 6/4/93"; +#endif /* LIBC_SCCS and not lint */ +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <ctype.h> +#include <errno.h> +#include <stdlib.h> +#include <inttypes.h> +#include "xlocale_private.h" + +/* + * Convert a string to a uintmax_t integer. + * + * Assumes that the upper and lower case + * alphabets and digits are each contiguous. + */ +uintmax_t +strtoumax_l(const char * __restrict nptr, char ** __restrict endptr, int base, + locale_t locale) +{ + const char *s; + uintmax_t acc; + char c; + uintmax_t cutoff; + int neg, any, cutlim; + FIX_LOCALE(locale); + + /* + * See strtoimax for comments as to the logic used. + */ + s = nptr; + do { + c = *s++; + } while (isspace_l((unsigned char)c, locale)); + if (c == '-') { + neg = 1; + c = *s++; + } else { + neg = 0; + if (c == '+') + c = *s++; + } + if ((base == 0 || base == 16) && + c == '0' && (*s == 'x' || *s == 'X') && + ((s[1] >= '0' && s[1] <= '9') || + (s[1] >= 'A' && s[1] <= 'F') || + (s[1] >= 'a' && s[1] <= 'f'))) { + c = s[1]; + s += 2; + base = 16; + } + if (base == 0) + base = c == '0' ? 8 : 10; + acc = any = 0; + if (base < 2 || base > 36) + goto noconv; + + cutoff = UINTMAX_MAX / base; + cutlim = UINTMAX_MAX % base; + for ( ; ; c = *s++) { + if (c >= '0' && c <= '9') + c -= '0'; + else if (c >= 'A' && c <= 'Z') + c -= 'A' - 10; + else if (c >= 'a' && c <= 'z') + c -= '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 = UINTMAX_MAX; + errno = ERANGE; + } else if (!any) { +noconv: + errno = EINVAL; + } else if (neg) + acc = -acc; + if (endptr != NULL) + *endptr = (char *)(any ? s - 1 : nptr); + return (acc); +} +uintmax_t +strtoumax(const char * __restrict nptr, char ** __restrict endptr, int base) +{ + return strtoumax_l(nptr, endptr, base, __get_locale()); +} |