157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/***********************************************************
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Copyright 1991, 1992, 1993 by Stichting Mathematisch Centrum,
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Amsterdam, The Netherlands.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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provided that the above copyright notice appear in all copies and that
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both that copyright notice and this permission notice appear in
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supporting documentation, and that the names of Stichting Mathematisch
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Centrum or CWI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior permission.
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STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
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THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
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FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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******************************************************************/
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/*
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** strtoul
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** This is a general purpose routine for converting
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** an ascii string to an integer in an arbitrary base.
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** Leading white space is ignored. If 'base' is zero
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** it looks for a leading 0, 0x or 0X to tell which
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** base. If these are absent it defaults to 10.
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** Base must be 0 or between 2 and 36 (inclusive).
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** If 'ptr' is non-NULL it will contain a pointer to
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** the end of the scan.
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** Errors due to bad pointers will probably result in
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** exceptions - we don't check for them.
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*/
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#include <ctype.h>
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#include <errno.h>
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unsigned long
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strtoul(str, ptr, base)
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register char * str;
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char ** ptr;
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int base;
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{
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register unsigned long result; /* return value of the function */
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register int c; /* current input character */
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register unsigned long temp; /* used in overflow testing */
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int ovf; /* true if overflow occurred */
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result = 0;
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ovf = 0;
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/* catch silly bases */
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if (base != 0 && (base < 2 || base > 36))
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{
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if (ptr)
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*ptr = str;
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return 0;
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}
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/* skip leading white space */
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while (*str && isspace(*str))
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str++;
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/* check for leading 0 or 0x for auto-base or base 16 */
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switch (base)
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{
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case 0: /* look for leading 0, 0x or 0X */
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if (*str == '0')
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{
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str++;
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if (*str == 'x' || *str == 'X')
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{
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str++;
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base = 16;
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}
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else
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base = 8;
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}
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else
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base = 10;
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break;
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case 16: /* skip leading 0x or 0X */
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if (*str == '0' && (*(str+1) == 'x' || *(str+1) == 'X'))
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str += 2;
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break;
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}
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/* do the conversion */
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while (c = *str)
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{
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if (isdigit(c) && c - '0' < base)
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c -= '0';
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else
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{
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if (isupper(c))
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c = tolower(c);
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if (c >= 'a' && c <= 'z')
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c -= 'a' - 10;
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else /* non-"digit" character */
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break;
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if (c >= base) /* non-"digit" character */
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break;
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}
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temp = result;
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result = result * base + c;
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if ((result - c) / base != temp) /* overflow */
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ovf = 1;
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str++;
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}
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/* set pointer to point to the last character scanned */
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if (ptr)
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*ptr = str;
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if (ovf)
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{
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result = ~0;
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errno = ERANGE;
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}
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return result;
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}
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long
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strtol(str, ptr, base)
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char * str;
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char ** ptr;
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int base;
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{
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long result;
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char sign;
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while (*str && isspace(*str))
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str++;
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sign = *str;
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if (sign == '+' || sign == '-')
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str++;
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result = (long) strtoul(str, ptr, base);
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/* Signal overflow if the result appears negative,
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except for the largest negative integer */
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if (result < 0 && !(sign == '-' && result == -result)) {
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errno = ERANGE;
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result = 0x7fffffff;
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}
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if (sign == '-')
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result = -result;
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return result;
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}
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