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Diffstat (limited to 'lib/non-semihosting/strtol.c')
| -rw-r--r-- | lib/non-semihosting/strtol.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/lib/non-semihosting/strtol.c b/lib/non-semihosting/strtol.c new file mode 100644 index 0000000..4a5a404 --- /dev/null +++ b/lib/non-semihosting/strtol.c @@ -0,0 +1,146 @@ +/*- + * Copyright (c) 1990, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * 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. + * 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. + * + * From: @(#)strtol.c 8.1 (Berkeley) 6/4/93 + */ + +/* + * Portions copyright (c) 2009-2013, ARM Ltd. All rights reserved. + * --------------------------------------------------------------- + * File: lib/strtol.c + */ + +#include "types.h" +#include "ctype.h" +#include "limits.h" + +/* + * Convert a string to a long integer. + * + * Ignores `locale' stuff. Assumes that the upper and lower case + * alphabets and digits are each contiguous. + */ +static long +bsd_strtol(nptr, endptr, base) + const char *nptr; + char **endptr; + int base; +{ + const char *s = nptr; + unsigned long acc; + unsigned char c; + unsigned long cutoff; + int neg = 0, any, cutlim; + + /* + * 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. + */ + 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; + + /* + * 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 ? -(unsigned long)LONG_MIN : LONG_MAX; + cutlim = cutoff % (unsigned long)base; + cutoff /= (unsigned long)base; + for (acc = 0, any = 0;; c = *s++) { + if (!isascii(c)) + break; + 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 = neg ? LONG_MIN : LONG_MAX; + } else if (neg) + acc = -acc; + if (endptr != 0) + *((const char **)endptr) = any ? s - 1 : nptr; + return (acc); +} + +int strict_strtol(const char *str, unsigned int base, long *result) +{ + if (*str == '-') + *result = 0 - bsd_strtol(str + 1, NULL, base); + else + *result = bsd_strtol(str, NULL, base); + return 0; +} + +int strict_strtoul(const char *str, unsigned int base, unsigned long *result) +{ + *result = bsd_strtol(str, NULL, base); + return 0; +} |