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142 lines
3.7 KiB
C
142 lines
3.7 KiB
C
/* Copyright Abandoned 1996 TCX DataKonsult AB & Monty Program KB & Detron HB
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This file is public domain and comes with NO WARRANTY of any kind */
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/*
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Defines: int2str(), itoa(), ltoa()
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int2str(dst, radix, val)
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converts the (long) integer "val" to character form and moves it to
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the destination string "dst" followed by a terminating NUL. The
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result is normally a pointer to this NUL character, but if the radix
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is dud the result will be NullS and nothing will be changed.
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If radix is -2..-36, val is taken to be SIGNED.
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If radix is 2.. 36, val is taken to be UNSIGNED.
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That is, val is signed if and only if radix is. You will normally
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use radix -10 only through itoa and ltoa, for radix 2, 8, or 16
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unsigned is what you generally want.
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_dig_vec is public just in case someone has a use for it.
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The definitions of itoa and ltoa are actually macros in m_string.h,
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but this is where the code is.
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Note: The standard itoa() returns a pointer to the argument, when int2str
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returns the pointer to the end-null.
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itoa assumes that 10 -base numbers are allways signed and other arn't.
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*/
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#include <global.h>
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#include "m_string.h"
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char NEAR _dig_vec[] =
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"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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char *int2str(register long int val, register char *dst, register int radix)
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{
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char buffer[65];
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register char *p;
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long int new_val;
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if (radix < 0) {
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if (radix < -36 || radix > -2) return NullS;
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if (val < 0) {
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*dst++ = '-';
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val = -val;
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}
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radix = -radix;
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} else {
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if (radix > 36 || radix < 2) return NullS;
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}
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/* The slightly contorted code which follows is due to the
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fact that few machines directly support unsigned long / and %.
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Certainly the VAX C compiler generates a subroutine call. In
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the interests of efficiency (hollow laugh) I let this happen
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for the first digit only; after that "val" will be in range so
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that signed integer division will do. Sorry 'bout that.
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CHECK THE CODE PRODUCED BY YOUR C COMPILER. The first % and /
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should be unsigned, the second % and / signed, but C compilers
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tend to be extraordinarily sensitive to minor details of style.
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This works on a VAX, that's all I claim for it.
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*/
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p = &buffer[sizeof(buffer)-1];
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*p = '\0';
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new_val=(ulong) val / (ulong) radix;
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*--p = _dig_vec[(uchar) ((ulong) val- (ulong) new_val*(ulong) radix)];
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val = new_val;
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#ifdef HAVE_LDIV
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while (val != 0)
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{
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ldiv_t res;
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res=ldiv(val,radix);
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*--p = _dig_vec[res.rem];
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val= res.quot;
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}
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#else
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while (val != 0)
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{
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new_val=val/radix;
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*--p = _dig_vec[(uchar) (val-new_val*radix)];
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val= new_val;
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}
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#endif
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while ((*dst++ = *p++) != 0) ;
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return dst-1;
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}
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/*
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This is a faster version of the above optimized for the normal case of
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radix 10 / -10
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*/
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char *int10_to_str(long int val,char *dst,int radix)
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{
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char buffer[65];
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register char *p;
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long int new_val;
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if (radix < 0) /* -10 */
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{
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if (val < 0)
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{
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*dst++ = '-';
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val = -val;
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}
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}
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p = &buffer[sizeof(buffer)-1];
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*p = '\0';
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new_val= (long) ((unsigned long int) val / 10);
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*--p = '0'+ (char) ((unsigned long int) val - (unsigned long) new_val * 10);
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val = new_val;
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while (val != 0)
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{
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new_val=val/10;
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*--p = '0' + (char) (val-new_val*10);
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val= new_val;
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}
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while ((*dst++ = *p++) != 0) ;
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return dst-1;
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}
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#ifdef USE_MY_ITOA
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/* Change to less general itoa interface */
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char *my_itoa(int val, char *dst, int radix)
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{
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VOID(int2str((long) val,dst,(radix == 10 ? -10 : radix)));
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return dst;
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}
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char *my_ltoa(long int val, char *dst, int radix)
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{
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VOID(int2str((long) val,dst,(radix == 10 ? -10 : radix)));
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return dst;
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}
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#endif
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