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/* strtol.c - strtol, for machines that don't have it */ |
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|
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/* Copyright 1991 Mark Russell, University of Kent at Canterbury. */ |
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|
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char ukcprog_strtol_sccsid[] = "$Id: strtol.c,v 1.1 2002/03/08 14:37:29 tdb Exp $ UKC"; |
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|
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#if defined(clipper) || (defined(vax) && !defined(ultrix)) |
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|
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#include <ctype.h> |
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#include <stdlib.h> |
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|
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#define NO_STRTOL |
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#endif |
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|
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#ifdef NO_STRTOL |
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long |
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strtol(nptr, eptr, base) |
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const char *nptr; |
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char **eptr; |
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int base; |
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{ |
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const char *s, *save_s; |
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long val; |
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|
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for (s = nptr; *s != '\0' && isspace(*s); ++s) |
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; |
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|
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if (base > 36) { |
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base = 10; |
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} |
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else if (base == 16) { |
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if (*s == '0' && (s[1] == 'x' || s[1] == 'X')) |
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s += 2; |
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} |
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else if (base == 0) { |
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if (*s == '0') { |
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++s; |
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if (*s == 'x' || *s == 'X') { |
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++s; |
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base = 16; |
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} |
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else if (isdigit(*s)) |
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base = 8; |
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else { |
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--s; |
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base = 10; |
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} |
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} |
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else |
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base = 10; |
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} |
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|
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val = 0; |
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for (save_s = s; *s != '\0'; ++s) { |
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int digit; |
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|
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if (isdigit(*s)) |
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digit = *s - '0'; |
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else if (isupper(*s)) |
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digit = *s - 'A' + 10; |
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else if (islower(*s)) |
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digit = *s - 'a' + 10; |
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else |
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break; |
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if (digit >= base) |
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break; |
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|
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val = val * base + digit; |
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} |
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if (s == save_s) |
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s = nptr; |
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|
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if (eptr != NULL) |
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*eptr = (char *)((s > save_s) ? s : nptr); |
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|
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return val; |
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} |
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#endif /* clipper || vax */ |
