57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
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/*
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* (c) copyright 1987 by the Vrije Universiteit, Amsterdam, The Netherlands.
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* See the copyright notice in the ACK home directory, in the file "Copyright".
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*/
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/* $Header$ */
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#include <ctype.h>
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long int
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strtol(nptr, endptr, base)
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register char *nptr;
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char **endptr;
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{
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register int v;
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register long val = 0;
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register int c;
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int sign = 1;
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char *startnptr = nptr, *nrstart;
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if (endptr) *endptr = (char *)nptr;
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while (isspace(*nptr)) nptr++;
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c = *nptr;
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if (c == '-' || c == '+') {
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if (c == '-') sign = -1;
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nptr++;
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}
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nrstart = nptr; /* start of the number */
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/* When base is 0, the syntax determines the actual base */
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if (base == 0)
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if (*nptr == '0')
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if (*++nptr == 'x' || *nptr == 'X') {
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base = 16;
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nptr++;
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}
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else base = 8;
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else base = 10;
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else if (base==16 && *nptr=='0' && (*++nptr =='x' || *nptr =='X'))
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nptr++;
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while (isdigit(c = *nptr) || isalpha(c)) {
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if (isalpha(c))
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v = 10 + (isupper(c) ? c - 'A' : c - 'a');
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else
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v = c - '0';
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if (v >= base) break;
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val = (val * base) + v;
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nptr++;
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}
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if (endptr) {
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if (nrstart == nptr) *endptr = (char *)startnptr;
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else *endptr = (char *)nptr;
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}
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return (long) sign * val;
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}
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