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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libc/] [stdlib/] [strtol.c] - Rev 816
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/* FUNCTION <<strtol>>---string to long INDEX strtol INDEX _strtol_r ANSI_SYNOPSIS #include <stdlib.h> long strtol(const char *<[s]>, char **<[ptr]>,int <[base]>); long _strtol_r(void *<[reent]>, const char *<[s]>, char **<[ptr]>,int <[base]>); TRAD_SYNOPSIS #include <stdlib.h> long strtol (<[s]>, <[ptr]>, <[base]>) char *<[s]>; char **<[ptr]>; int <[base]>; long _strtol_r (<[reent]>, <[s]>, <[ptr]>, <[base]>) char *<[reent]>; char *<[s]>; char **<[ptr]>; int <[base]>; DESCRIPTION The function <<strtol>> converts the string <<*<[s]>>> to a <<long>>. First, it breaks down the string into three parts: leading whitespace, which is ignored; a subject string consisting of characters resembling an integer in the radix specified by <[base]>; and a trailing portion consisting of zero or more unparseable characters, and always including the terminating null character. Then, it attempts to convert the subject string into a <<long>> and returns the result. If the value of <[base]> is 0, the subject string is expected to look like a normal C integer constant: an optional sign, a possible `<<0x>>' indicating a hexadecimal base, and a number. If <[base]> is between 2 and 36, the expected form of the subject is a sequence of letters and digits representing an integer in the radix specified by <[base]>, with an optional plus or minus sign. The letters <<a>>--<<z>> (or, equivalently, <<A>>--<<Z>>) are used to signify values from 10 to 35; only letters whose ascribed values are less than <[base]> are permitted. If <[base]> is 16, a leading <<0x>> is permitted. The subject sequence is the longest initial sequence of the input string that has the expected form, starting with the first non-whitespace character. If the string is empty or consists entirely of whitespace, or if the first non-whitespace character is not a permissible letter or digit, the subject string is empty. If the subject string is acceptable, and the value of <[base]> is zero, <<strtol>> attempts to determine the radix from the input string. A string with a leading <<0x>> is treated as a hexadecimal value; a string with a leading 0 and no <<x>> is treated as octal; all other strings are treated as decimal. If <[base]> is between 2 and 36, it is used as the conversion radix, as described above. If the subject string begins with a minus sign, the value is negated. Finally, a pointer to the first character past the converted subject string is stored in <[ptr]>, if <[ptr]> is not <<NULL>>. If the subject string is empty (or not in acceptable form), no conversion is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is not <<NULL>>). The alternate function <<_strtol_r>> is a reentrant version. The extra argument <[reent]> is a pointer to a reentrancy structure. RETURNS <<strtol>> returns the converted value, if any. If no conversion was made, 0 is returned. <<strtol>> returns <<LONG_MAX>> or <<LONG_MIN>> if the magnitude of the converted value is too large, and sets <<errno>> to <<ERANGE>>. PORTABILITY <<strtol>> is ANSI. No supporting OS subroutines are required. */ /*- * Copyright (c) 1990 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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. */ #include <_ansi.h> #include <limits.h> #include <ctype.h> #include <errno.h> #include <stdlib.h> #include <reent.h> /* * Convert a string to a long integer. * * Ignores `locale' stuff. Assumes that the upper and lower case * alphabets and digits are each contiguous. */ long _DEFUN (_strtol_r, (rptr, nptr, endptr, base), struct _reent *rptr _AND _CONST char *nptr _AND char **endptr _AND int base) { register const char *s = nptr; register unsigned long acc; register int c; register unsigned long cutoff; register 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 (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; rptr->_errno = ERANGE; } else if (neg) acc = -acc; if (endptr != 0) *endptr = (char *) (any ? s - 1 : nptr); return (acc); } #ifndef _REENT_ONLY long _DEFUN (strtol, (s, ptr, base), _CONST char *s _AND char **ptr _AND int base) { return _strtol_r (_REENT, s, ptr, base); } #endif
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